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🚀9.22

Total questions: 120

Worksheet time: 1hrs 5mins

Name
Class
Date
1.
Question Image

Non-Verbal Cues.

Match each of these non-verbal cues with the correct meaning.

a)

1.

Permission to speak

b)

2.

Quiet Please, Classmate.

c)

3.

Restroom

d)

4.

Tissue

e)

5.

Water

2.

Identify the volume of liquid in this graduated cylinder.

a)

205 mL

b)

210 mL

c)

220 mL

d)

250 mL

e)

250 L

3.
Question Image

Match each lab tool with its name.

a)

1.

Test Tube

b)

2.

Petri Dish

c)

3.

Triple Beam Balance

d)

4.

Beaker

e)

5.

Metric Ruler

4.
Question Image

Match each of these terms with its definition.

a)

The amount of atoms in an object.

1.

Mass

b)

The amount of space something takes up.

2.

Volume

c)

The distance measured between two points.

3.

Length

d)

A description of matter.

4.

Property

e)

An action of matter.

5.

Change

5.
Question Image

Match each of these TBB measurements with its correct mass.

a)

1.

536.8g

b)

2.

37.3g

c)

3.

105.6g

d)

4.

290.2g

e)

5.

263.5g

6.
Question Image

Identify which letter represents the correct length.

a)

A

1.

1.5cm

b)

C

2.

4.2cm

c)

D

3.

5.3cm

d)

F

4.

8.1cm

e)

G

5.

12cm

7.
Question Image

Match each of these parts with its corresponding part.

a)

Outline of an object.

1.

Shape

b)

Amount of space something takes up.

2.

Volume

c)

Amount of amounts in an object.

3.

Mass

d)

Anything with mass and volume.

4.

Matter

e)

Exactly Measurable.

5.

Definite

8.

Identify the volume of liquid in this graduated cylinder.

a)

205 mL

b)

210 mL

c)

220 mL

d)

250 mL

e)

250 L

9.

Correctly identify the volume of liquid in this graduated cylinder.​ (a)  

Choose from the below words
53mL
54 mL
66 mL
56 mL
10.
Where do we read the level of liquid?
a)
The highest point the liquid touches
b)
The bottom of the meniscus
c)
Half way between, we make an educated guess and round it
d)
Somewhere about there
11.
Question Image

For each of these concepts match its corresponding meaning.

a)

Density

1.

The amount of mass per unit of volume of an object

b)

Mass

2.

The amount of atoms in an object.

c)

Volume

3.

The amount of space an object takes up.

d)

Gravity

4.

A measurement of the pull on an object's mass.

e)

Water Displacement

5.

Method used to determine the volume of an irregularly shaped object - uses graduated cylinder.

12.
Question Image

Match each of these terms with its definition.

a)

Description of Matter.

1.

Property

b)

Action of Matter.

2.

Change

c)

Description of matter, indicates features of a sample of matter

3.

Physical Property

d)

Description of matter, depicts the ability of a sample of matter to participate in a reaction.

4.

Chemical Property

e)

Action of matter, results in the creation of a new substance.

5.

Chemical Change

13.

An example of a physical property is ___ (select all that apply).

a)
flammability
b)
acidic
c)
color
d)
ability to rust
e)

shape

14.
What makes chemical properties hard to observe?
a)
They cause change of state 
b)
you can't see them until they produce new materials
c)
Wearing protective glasses is required
d)
They happen too quickly
15.

Example for chemical property. (select all that apply)

a)
color
b)
hardness
c)
toxicity
d)
solubility
e)

flammability

16.

Example for physical property. (select all that apply)

a)
reacts with an acid
b)

smell

c)
flammibility
d)
taste
e)

state of matter

17.

Example for chemical property. (select all that apply)

a)
malleability
b)
texture
c)

combustibility

d)
sour taste
e)

corrosiveness

18.
Changing the way matter looks without changing it into NEW matter is a:
a)
Chemical change
b)
Physical change
c)
Energy change
d)
BOTH a chemical and a physical change
19.
A property of matter that describes its ability to change into entirely new substances is called a(n)____________
a)
flammability
b)
reactivity
c)
nonflammability
d)
chemical property
20.
A description of objects that can be measured and observed.
a)
gas
b)
mustangs
c)
physical properties
d)
melting point
21.

What is the mass of this object?

a)

615.3 grams

b)

516 grams

c)

165.3 grams

d)

165.3 inches

22.

What is the mass of this object?

a)

421.5 grams

b)

241.5 grams

c)

1.524 grams

d)

421.5 inches

23.

What is the volume of water in this graduated cylinder in ml?

(a)  

24.

What is the volume of water in this graduated cylinder in ml?

(a)  

25.

Multi-Select: Select the activities that will POSITIVELY impact your learning success.

a)
b)
c)
d)
26.

Multiple Choice: What percentage should be your MINIMAL goal for all homework, activities and assessments in Science?

a)

75%

b)

80%

c)

85%

d)

100%

27.

Positively RIGHT vs. Negatively WRONG

Classify each of these items as a RIGHT choice or a WRONG choice.

Categorize the following

Being Respectful of EVERYONE

Pushing YOUR SEAT under the Table after use.

Talking when the Teacher Talks.

RIGHT
WRONG
28.

Positively RIGHT vs. Negatively WRONG

Classify each of these items as a RIGHT choice or a WRONG choice.

Categorize the following

Being Respectful of EVERYONE

Pushing YOUR SEAT under the Table after use.

Talking when the Teacher Talks.

Asking Ms. Hickson for Permission to Speak.

RIGHT
WRONG
29.
Question Image

Match each of these terms with its definition.

a)

The amount of atoms in an object.

1.

Mass

b)

The amount of space something takes up.

2.

Volume

c)

The distance measured between two points.

3.

Length

d)

A description of matter.

4.

Property

e)

An action of matter.

5.

Change

30.
Question Image

Match each lab tool with its name.

a)

1.

Microscope

b)

2.

Graduated Cylinder

c)

3.

Triple Beam Balance

d)

4.

Flask

e)

5.

Metric Ruler

31.

Which diagram best represents the arrangement of particles in a solid?

a)

Particles are far apart and move freely

b)

Particles are closely packed in a fixed pattern

c)

Particles are loosely packed and slide past each other

d)

Particles are ionized and move rapidly

32.

Given a diagram showing particles closely packed but able to slide past each other, which state of matter is represented?

a)

Solid

b)

Liquid

c)

Gas

d)

Plasma

33.

A diagram shows particles arranged in a regular, repeating pattern. What can you infer about the temperature of this substance compared to its liquid state?

a)

It is at a higher temperature

b)

It is at a lower temperature

c)

It is at the same temperature

d)

Temperature cannot be determined

34.

A diagram shows a block of ice turning into water. What is the relative temperature change during this process?

a)

Temperature decreases

b)

Temperature stays the same

c)

Temperature increases

d)

Temperature cannot be determined

35.

Given a diagram of particles in a container, how would you identify if the substance is a liquid or a gas?

a)

By the color of the particles

b)

By the arrangement and movement of the particles

c)

By the size of the container

d)

By the number of particles

36.

If you are given a diagram of particles in a solid, liquid, and gas, how can you determine which has the highest temperature?

a)

The one with the most closely packed particles

b)

The one with the most spread out and fastest moving particles

c)

The one with the largest particles

d)

The one with the most particles

37.

A diagram shows a liquid cooling and turning into a solid. What is the relative temperature change during this process?

a)

Temperature increases

b)

Temperature decreases

c)

Temperature stays the same

d)

Temperature cannot be determined

38.

Given a diagram of particles in a container, how would you determine if the substance is a solid?

a)

Particles are far apart and move quickly

b)

Particles are closely packed and vibrate in place

c)

Particles are loosely packed and slide past each other

d)

Particles are ionized and move rapidly

39.

Which of the following described the properties of particles in solid? (Select all that apply).

a)

Closely packed in orderly manner

b)

Vibrate about fixed position

c)

Very strong forces of attraction

d)

Low kinetic energy

e)

slide past each other

40.

Which of the following described the properties of particles in liquid? (Select all that apply).

a)

Closely packed in orderly manner

b)

slide over each other

c)

Vibrate about fixed position

d)

Low kinetic energy

e)

Closely packed in disorderly,random manner

41.
Question Image

Match each of these parts with its corresponding part.

a)

State of Matter, definite Shape, definite Volume.

1.

Solid

b)

State of Matter, indefinite Shape, definite Volume.

2.

Liquid

c)

State of Matter, indefinite Shape, indefinite Volume.

3.

Gas

d)

One Form of Matter.

4.

State of Matter

e)

Exactly Measurable.

5.

Definite

42.
Question Image

Match the following

a)
1.

Physical Change

Chopping Wood

b)
2.

Chemical change

Fire Burning

c)
3.

Chemical Change

Precipitate Forms

d)
4.

Physical Change

Condensation

e)
5.

Chemical change

Fizzing

43.
Question Image

Match the following evidence with the observation.

a)

1.

Physical Change - because it is melting.

b)

2.

Chemical Change - because it is burned.

c)

3.

Physical Change - because it is bent.

d)

4.

Physical Change - because size changes.

e)

5.

Chemical change - because acids/bases.

44.
Question Image

Match the following:

a)

Physical Changes

1.

Changes that change the appearances of the substance, not is identify.

b)

Chemical Changes

2.

changes that cause a substance to change into a new substance

c)

Freezing, Grinding, Chopping, Tearing, Evaporating

3.

Examples of Physical Changes

d)

Combustion, Rusting, Burning, Corroding

4.

Examples of Chemical Changes

45.
Question Image

Match the following vocabulary word to the correct definition

a)

Luster

1.

shiny

b)

precipitate

2.

when you mix two liquids together and a solid is formed

c)

malleable

3.

being able to bend into a shape

d)

boiling point

4.

the temperature when a liquid becomes a gas.

e)

solubility

5.

the ability to dissolve a solute into a solvent

46.
Question Image

Match each of these parts with its corresponding part.

a)

Outline of an object.

1.

Shape

b)

Amount of space something takes up.

2.

Volume

c)

Amount of amounts in an object.

3.

Mass

d)

Anything with mass and volume.

4.

Matter

e)

Exactly Measurable.

5.

Definite

47.
Question Image

Match each of these TBB measurements with its correct mass.

a)

1.

536.8g

b)

2.

37.3g

c)

3.

105.6g

d)

4.

290.2g

e)

5.

263.5g

48.
Why do the liquids form different layers?
a)
They have different densities.  
b)
They have different masses.  
c)
They have different volumes.  
d)
They are different temperatures.  
49.

Look at this image.  Which object has the LOWEST density in water? How? 

a)
The Ping Pong Ball because it floats to the top 
b)
The bolt because it has sunk to the bottom
c)
The soda cap because it is not just full of air like the Ping Pong ball
50.

Box A has ​ (a)   density than box B. When placed in water, box A will ​likely (b)   and box B will likely  (c)   .

Choose from the below words
float
Box B
less
the same
more
sink
51.

Given the table below, which sample has the highest density?

a)

Sample A

b)

Sample B

c)

Sample C

d)

Sample D

52.

Which state change is shown in BOX 1 (Hint: The arrow head points to the end state)?

a)

Sublimation

b)

Condensation

c)

Melting

d)

Freezing

e)

Boiling

53.

During a phase change, the temperature _____.

a)
increases
b)
decreases
c)
fluctuates
d)
stays the same
54.

Which two phases changes absorb energy (heat enters)?

(a)  

Choose from the below words

Freezing, Melting

Condensation, Evaporation

Freezing, Condensation

Melting, Evaporation
55.

Which two phases changes take away energy (heat exits)?

(a)  

Choose from the below words

Freezing, Melting

Condensation, Evaporation

Freezing, Condensation

Melting, Evaporation

56.

Brad is comparing a ceramic cup to the hot water inside the ceramic cup and the water vapor above the cup. What can she say about the motion of the particles in all of the substances?

a)

They do not move.

b)

They are all always moving.

c)

They all move past each other slowly.

d)

They all move very fast in all directions.

57.

When thermal energy is decreased in a liquid, what change in state is happening?

a)

Melting

b)

Freezing

c)

Condensation

d)

Evaporation

58.

What happens to the movement of the particles in a substance when the thermal energy is decreased (Select all that apply)?

a)

Speed Up

b)

Slow Down

c)

They Spread Out.

d)

They Get Closer Together.

59.

What happens to the movement of the particles in a substance when the thermal energy is increased (Select all that apply)?

a)

Speed Up

b)

Slow Down

c)

They Spread Out.

d)

They Get Closer Together.

60.
Question Image

Match each image with its meaning.

a)

1.

Solid Particles

b)

2.

Liquid Particles

c)

3.

Gas Particles

d)

4.

Graduated Cylinder

e)

5.

Triple Beam Balance

61.

Properties and Changes

Sort each of these examples in the correct grouping. Physical and Chemical Properties & Physical and Chemical Changes.

Categorize the following

Toxicity

Flammability

Corrosiveness

Reactivity

Combustibility

Green Color

Shapes

Size

Descriptions about Features

State of Matter

Measurements/ Number Descriptions

Description that indicates its ability to participate in a chemical reaction.

Description that remarks of features.

State Changes

Identity stays the Same

May be Reversible

Action that will not result in an altering of identity.

Cutting Hair

All Cooking

Has Signs (Indicators)

PP
CP
PC
CC
62.

Changes

Sort each of these examples in the correct grouping. Physical and Chemical Changes.

Categorize the following

State Changes

Identity stays the Same

May be Reversible

Action that will not result in an altering of identity.

Cutting Hair

All Cooking

Has Signs (Indicators)

Painting a Wall

Melting Ice Cream

Windows Condensating

Creates a NEW Substance

Grilling

Fizzing

Smoke Forming

Forming a Precipitate

pH Change

Automatic Color Change

Souring Milk

Rusting

Broken Glass

PC
CC
63.

This image shows three different phases of water. In which state are the molecules moving the fastest?

a)

A

b)

B

c)

C

d)

A and C

64.

A student claims that when wood burns, matter is destroyed because the wood disappears. Which scientific principle can be used to evaluate this claim?

a)

The Law of Conservation of Energy

b)

The Law of Conservation of Mass

c)

The Particle Theory of Matter

d)

The Law of Definite Proportions

65.

An oil spill cleanup crew needs to separate oil from water. Which properties make this separation possible?

a)

Oil and water do not mix

b)

Oil has a different color than water

c)

Oil and water have different boiling points

d)

Oil floats on top of water

e)

Oil is less dense than water

66.

Dry ice (solid carbon dioxide) changes directly from solid to gas at room temperature. This process is called:

a)

Melting

b)

Evaporation

c)

Sublimation

d)

Condensation

67.

Which of the following processes are examples of physical changes? (Select all that apply)

a)

Paper burning to ash

b)

Sugar dissolving in coffee

c)

Ice melting into water

d)

Water boiling to steam

e)

Clay being molded into a pot

68.

A student claims that when water vapor condenses into liquid water, it becomes a different substance. Which evidence would best refute this claim?

a)

The water looks the same before and after condensation

b)

The process can be reversed by heating

c)

Both water vapor and liquid water have the same chemical formula (H₂O)

d)

The temperature changes during condensation

69.

Which method will allow a person to identify an unknown sample of matter?

a)

Measure the temperature of the sample, and compare it to the temperatures of different samples of elements.

b)

Compare the size of the sample to the sizes of different samples of elements.

c)

Calculate the density of the sample, and compare it to the densities of different elements.

d)

Compare the color of the sample to the colors of different elements.

70.

The student wants to model a chemical reaction using marbles from Jar A and Jar B. Which table shows one possible combination of the number of marbles the student can use to show a reaction that follows the Law of Conservation of Mass?

a)

Jar A: 5, Jar B: 5, Products: 5

b)

Jar A: 10, Jar B: 3, Products: 9

c)

Jar A: 4, Jar B: 3, Products: 7

d)

Jar A: 2, Jar B: 8, Products: 6

71.

Which model represents the change in state of dry ice at room temperature? Dry ice undergoes sublimation at room temperature.

a)

[Model showing closely packed particles changing to widely spaced particles]

b)

[Model showing loosely packed particles changing to closely packed particles]

c)

[Model showing widely spaced particles changing to closely packed particles]

d)

[Model showing loosely packed particles changing to widely spaced particles]

72.

What is density, and how does it help identify substances?

a)

Density is the amount of space something takes up and changes based on sample size

b)

Density is mass divided by volume and remains constant regardless of sample size

c)

Density is the weight of an object and varies with location

d)

Density is the color of a substance and helps with visual identification

73.

A student has three different materials: aluminum (2.7 g/cm³), cork (0.24 g/cm³), and water (1.0 g/cm³). If all three are placed in a container together, what will happen?

a)

All materials will float on top of each other

b)

Aluminum will float, cork will sink, water will be in the middle

c)

Cork will float on water, aluminum will sink to the bottom

d)

All materials will mix together evenly

74.

Which of the following represents the correct arrangement of particles as matter changes from solid to liquid to gas?

a)

Tightly packed → loosely arranged → far apart with high motion

b)

Far apart → tightly packed → loosely arranged

c)

Loosely arranged → far apart → tightly packed

d)

Random arrangement in all three states

75.

What does the subscript in a chemical formula tell you?

a)

How many molecules are present

b)

How many atoms are present

c)

How many elements are present

d)

How many neutrons are present

76.

Labeling the Heating Curve.

Indicate the parts of this Heating Curve.

Place your Label on each numbered part.

77.

Identifying the States of Matter.

Accurately select characteristics of each State of Matter.

Categorize the following

Defintion: Definite, Definite

Definition: Indefinite, Definite

Definition: Indefinite, Indefinite

Particles: Packed Close

Movement: Vibrates

Intermolecular Force: Strongest

Temperature: Coolest

Particles: Loosely Touching

Movement: Slide Past One Another

Intermolecular Forces: Medium

Particles: Farthest apart

Movement: Zippy Bumper Cars

Intermolecular Forces: Weakest

Temperature: Warm

Temperature: Hottest

Solid
Liquid
Gas
78.

Labeling the State Change Triangle.

Indicate the parts of this State Change Triangle.

Place your Label on each numbered part.

79.
Question Image

Match each term with its definition.

a)

Solid

1.

Definite Shape and Definite Volume

b)

Liquid

2.

Indefinite Shape and Definite Volume

c)

Gas

3.

Indefinite Shape and Indefinite Volume

d)

Matter

4.

Anything with Mass and Volume

e)

Mass

5.

Amount of Atoms

80.

Arrange the states of matter in order, MOST compacted (close) to LEAST compacted (farthest away).

a)

SOLID

b)

L I Q U I D

c)

G A S

1)
2)
3)
81.

Which state change is shown in BOX 3 (Hint: The arrow head points to the end state)?

a)

Sublimation

b)

Condensation

c)

Deposition

d)

Freezing

e)

Boiling

82.

The slower particles of a substance moves, _____ (Select all that apply).

a)

the colder the particles are.

b)

the warmer the particles are.

c)

the more energy it has.

d)

the less energy it has.

83.

Which statement is CORRECT about matter when the temperature increase?

a)

Speed Up and Move Closer

b)

Speed Up and Move Farther Apart

c)

Slow Down and Move Farther Apart

d)

Slow Down and Move Closer

84.

Which of these state changes result in heat (energy) being removed (Select all that apply)?

a)

Gas to Solid

b)

Solid to Liquid

c)

Solid to Gas

d)

Liquid to Gas

e)

Liquid to Solid

85.

What phase change occurs when you start at C and end at D?

a)

Freezing

b)

Melting

c)

Condensing

d)

Evaporation

86.

Which of the following best describes an endothermic process during a phase change?`

a)

Heat is released as a substance freezes.

b)

Heat is absorbed as a substance melts.

c)

Heat is released as a substance condenses.

d)

Heat is absorbed as a substance cools.

87.

When looking at a heating curve, what does a flat (horizontal) line indicate?

a)

The temperature is increasing rapidly.

b)

The substance is undergoing a phase change.

c)

The substance is cooling down.

d)

The substance is a gas.

88.

On a cooling curve, what happens to the energy of the particles as a substance freezes?

a)

The energy increases.

b)

The energy stays the same.

c)

The energy decreases.

d)

The energy disappears.

89.

Which of the following correctly matches the phase with its location on a typical heating curve (from left to right)?

a)

Gas, Liquid, Solid

b)

Solid, Liquid, Gas

c)

Liquid, Solid, Gas

d)

Gas, Solid, Liquid

90.

Which statement best describes what happens at the boiling point on a heating curve?

a)

The substance is changing from liquid to gas.

b)

The substance is changing from gas to liquid.

c)

The temperature decreases.

d)

The substance is changing from solid to liquid.

91.

If a substance is at its condensation point, what phase change is occurring?

a)

Gas to liquid

b)

Liquid to gas

c)

Solid to liquid

d)

Liquid to solid

92.

Which of the following is an example of an exothermic reaction?

a)

Ice melting in your hand

b)

Water boiling on a stove

c)

Water freezing in a tray

d)

Solid carbon dioxide (dry ice) turning into gas

93.

A student observes a heating curve and notices two flat sections. Explain what is happening to the substance during these flat sections and why the temperature does not increase.

a)

The substance is cooling down rapidly.

b)

The substance is undergoing two different phase changes, and energy is used to break intermolecular bonds rather than increase temperature.

c)

The substance is evaporating and condensing at the same time.

d)

The substance is losing energy to the environment.

94.

A student claims that during boiling, the temperature of the liquid increases until all the liquid has turned to gas. Use your understanding of heating curves to explain whether this claim is correct or incorrect.

a)

Correct, because energy always increases temperature.

b)

Incorrect, because during boiling, the temperature remains constant as energy is used for the phase change.

c)

Correct, because boiling is an endothermic process.

d)

Incorrect, because the temperature decreases during boiling.

95.

Analyze a heating curve and determine at which points the substance is a mixture of two phases. Explain your reasoning.

a)

Only at the beginning of the curve

b)

At the flat sections, because the substance is transitioning between phases (e.g., solid and liquid, or liquid and gas)

c)

At the sloped sections, because temperature is changing

d)

Only at the end of the curve

96.

Suppose you are given a heating curve for an unknown substance. How could you use the curve to estimate the melting and boiling points of the substance?

a)

By finding the highest and lowest points on the curve

b)

By identifying the temperatures at the flat sections of the curve

c)

By measuring the length of the curve

d)

By looking at the steepest slope

97.

If you wanted to design an experiment to show the difference between endothermic and exothermic phase changes, which two processes would you choose and why?

a)

Melting and freezing, because melting absorbs energy (endothermic) and freezing releases energy (exothermic)

b)

Boiling and condensation, because both are endothermic

c)

Melting and boiling, because both are exothermic

d)

Freezing and condensation, because both absorb energy

98.

What term goes on the x-axis? (B)

a)

Heat(Energy)

b)

Temperature

c)

Phase

d)

Type of Matter

99.

What phase change occurs when you start at D and end at C?

a)

Freezing

b)

Melting

c)

Condensing

d)

Evaporation

100.

What phase change occurs when you start at C and end at D?

a)

Freezing

b)

Melting

c)

Condensing

d)

Evaporation

101.

Labeling the Heating Curve.

Indicate the parts of this Heating Curve.

Place your Label on each numbered part.

102.

Labeling the Cooling Curve.

Indicate the parts of this Cooling Curve.

Place your Label on each numbered part.

103.

Labeling the Triple-Point Diagram.

Indicate the parts of this Phase Diagram.

Place your Label on each lettered part.

104.

Understanding the Atom's Structure.

Accurately identify the property of each subatomic particle.

Categorize the following

Negatively charged subatomic.

e-

Located in the Electron Cloud.

Smallest of the three subatomics.

Positively charged subatomic.

p+

Located in the Nucleus with n0.

Unique to each element.

Neutrally charged subatomic.

n0

Located in the Nucleus with p+.

Does not affect the charge of the Nucleus.

Blue subatomic particle

Green subatomic particle

Red subatomic particle

Electron
Proton
Neutron
105.
_______ and _______ are located inside of the nucleus.
a)
Electrons and Protons
b)
Protons and Neutrons
c)
Neutrons and Electrons
106.

What letter on the diagram represents the substance only in the gas phase?

a)

A

b)

B

c)

C

d)

D

107.

What letter on the diagram represents a substance only in the solid phase?

a)

A

b)

B

c)

C

d)

D

108.

What phase of matter exists in part C of the graph?

a)

Gas

b)

Liquid

c)

Solid

d)

Plasma

109.
What state of matter is X?
a)
solid 
b)
liquid
c)
gas
d)
supercritical fluid
110.
Question Image

Match the following.

a)

Subatomic particle with +1 Charge.

1.

Proton

b)

Subatomic particle with -1 Charge.

2.

Electron

c)

Subatomic particle with 0 Charge.

3.

Neutron

d)

Center Region of Atom, Positively Charged.

4.

Nucleus

e)

Outer Region of Atom, Negatively Charged.

5.

Electron Cloud

111.

A student observes a heating curve and notices two flat sections. Explain what is happening to the substance during these flat sections and why the temperature does not increase.

a)

The substance is cooling down rapidly.

b)

The substance is undergoing two different phase changes, and energy is used to break intermolecular bonds rather than increase temperature.

c)

The substance is evaporating and condensing at the same time.

d)

The substance is losing energy to the environment.

112.

A student claims that during boiling, the temperature of the liquid increases until all the liquid has turned to gas. Use your understanding of heating curves to explain whether this claim is correct or incorrect.

a)

Correct, because energy always increases temperature.

b)

Incorrect, because during boiling, the temperature remains constant as energy is used for the phase change.

c)

Correct, because boiling is an endothermic process.

d)

Incorrect, because the temperature decreases during boiling.

113.

Suppose you are given a heating curve for an unknown substance. How could you use the curve to estimate the melting and boiling points of the substance?

a)

By finding the highest and lowest points on the curve

b)

By identifying the temperatures at the flat sections of the curve

c)

By measuring the length of the curve

d)

By looking at the steepest slope

114.

A student is analyzing a cooling curve and notices that the temperature remains constant at a certain point even though the substance is still losing energy. What is the best explanation for this observation?

a)

The thermometer is broken.

b)

The substance is undergoing a phase change, and energy is being released as bonds form.

c)

The substance is not losing energy.

d)

The substance is evaporating.

115.

If you wanted to design an experiment to show the difference between endothermic and exothermic phase changes, which two processes would you choose and why?

a)

Melting and freezing, because melting absorbs energy (endothermic) and freezing releases energy (exothermic)

b)

Boiling and condensation, because both are endothermic

c)

Melting and boiling, because both are exothermic

d)

Freezing and condensation, because both absorb energy

116.

Explain how energy transfer is different during the sloped (slanted) and flat portions of a heating.

a)

Energy is only transferred during the sloped (slanted) portions.

b)

During sloped (slanted) portions, energy increases temperature; during flat portions, energy changes the phase without changing temperature.

c)

Energy is not transferred during the flat portions.

d)

Energy is lost during sloped (slanted) portions and gained during flat portions.

117.

A student is given a graph of a cooling curve and asked to label the sections where the substance is solid, liquid, and gas. What strategy should the student use to accurately label these sections?

a)

Label the sections based on the order they appear on the graph.

b)

Use the temperatures at the flat sections to identify phase changes, then label the sloped (slanted) sections between them as solid, liquid, or gas.

c)

Guess based on the length of each section.

d)

Label all sections as liquid.

118.

What is the main difference between evaporation and boiling?

a)

Evaporation occurs only at the boiling point, while boiling can happen at any temperature.

b)

Boiling occurs throughout the liquid, while evaporation happens only at the surface.

c)

Evaporation requires more energy than boiling.

d)

Boiling does not involve energy transfer.

119.

What happens to the particles of a substance as it freezes?

a)

They move faster and spread apart.

b)

They stop moving completely.

c)

They slow down and arrange into a fixed pattern.

d)

They gain energy and move more freely.

120.

Which of the following is an example of deposition?

a)

Water boiling to form steam

b)

Frost forming on a cold window

c)

Ice melting into water

d)

Dew forming on grass