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8.1.1-.2 Review

Total questions: 85

Worksheet time: 55mins

Name
Class
Date
1.

What can models help scientists do?

a)

Communicate ideas

b)

Build machines

c)

Travel in time

d)

Grow plants

2.

What is an example of a model representing events that occur too fast to see?

a)

Model of weather systems

b)

Model of an earthquake

c)

Model of a dinosaur

d)

Model of the planets

3.

What are mathematical models made up of?

a)

Mathematical equations and data

b)

Physical objects and diagrams

c)

Historical events and timelines

d)

Chemical reactions and formulas

4.

What is an example of an event that takes a long time to model?

a)

Movement of tectonic plates

b)

A car race

c)

A football game

d)

A cooking show

5.

What is one advantage of using models in scientific research?

a)

They provide exact results without any errors.

b)

They allow scientists to predict and simplify complex systems.

c)

They eliminate the need for expert knowledge.

d)

They are always accurate and reliable.

6.

What is a weakness of models in terms of accuracy?

a)

Models are always accurate.

b)

Models are never complex.

c)

Models may not be accurate due to oversimplification.

d)

Models do not require expertise.

7.

Why is it important to share model results with the public?

a)

To keep the information confidential.

b)

To allow public understanding and input.

c)

To prevent public access to scientific data.

d)

To ensure only scientists understand the results.

8.

Which mathematical concept helps in understanding the size relationship in models?

a)

Geometry

b)

Proportion

c)

Algebra

d)

Calculus

9.

What happens to the ratios when two things are proportionate?

a)

They become zero

b)

They become equal

c)

They become negative

d)

They become infinite

10.

In the context of proportion, what does the term "model" refer to?

a)

A fashion model

b)

A mathematical representation

c)

A car model

d)

A computer model

11.

What does a proportionate relationship ensure in a model?

a)

Equal colors

b)

Equal weights

c)

Equal ratios

d)

Equal materials

12.

Who is credited with developing the idea of atoms around 460 BC?

a)

Aristotle

b)

Democritus

c)

Plato

d)

Socrates

13.

What was the primary method used by Democritus to study materials?

a)

Heating

b)

Freezing

c)

Crushing

d)

Dissolving

14.

Which model represents a molecule?

a)

A

b)

B

c)

C

d)

D

15.

Which part of the atom is the proton?

a)

A

b)

B

c)

C

16.

Which part of the atom is the electron?

a)

A

b)

B

c)

C

17.

Which answer lists the objects from smallest to largest?

a)

protons, atom, molecule, period of sentence

b)

period of sentence, proton, molecule, atom

c)

atom, molecule, proton, period of sentence

18.

The property that makes metal pts good for cooking is...

a)

flexibility

b)

electrical conductivity

c)

flammability

d)

heat conductivity

19.

The following are examples of physical properties except...

a)

reactivity

b)

smell

c)

color

d)

flexibility

20.

Which of the following is true?

a)

A physical property can only be seen.

b)

A physical property describes how matter can change when exposed to air.

c)

A physical property is something that can be observed about the substance by itself.

d)

A physical property can only be observed when two types of matter interact.

21.
Is frying an egg a physical or chemical change?
a)
chemical
b)
physical
22.

Which of the following are physical properties of the matter pictured?

Check all that are true

a)

reacts to oxygen

b)

smooth

c)

malleable (bendable)

d)

reddish-brown

e)

shiny

23.

A chemical property describes how matter __________.

a)

smells

b)

reacts with another type of matter

c)

looks under a microscope

d)

dissolves when made into a solution

24.

Jack leaves solid butter near a warm surface. When Jack returns, the butter has turned into a liquid. Jack's friend Elijah insists this is a chemical change. Is Elijah right?

a)

no, because no new matter was formed

b)

yes, because the matter changed states

c)

no, because the butter didn’t have enough time to go through a chemical change

d)

yes, because melted butter is a new type of matter

25.
Is burning wood a chemical or physical change?
a)
chemical
b)
physical
26.
Is glass breaking a chemical or phyiscal change?
a)
chemical
b)
physical
27.
Is melting ice a chemical or physical change?
a)
chemical
b)
physical
28.
Is spoiling food a physical or chemical change?
a)
phyiscal
b)
chemical
29.

Is this an example of a physical or chemical change?

a)

physical

b)

chemical

30.

Is this an example of a physical or chemical change?

a)

physical

b)

chemical

31.

Which of these actions cause a PHYSICAL change?

a)

rusting of metal pipes

b)

burning a log

c)

cooking an egg

d)

crushing an aluminum can

32.

Rusting metal is an example of a ____ change.

a)

chemical

b)

phase

c)

state

d)

physical

33.

Salt water, a mixture, is made by dissolving salt in water. Mixtures like this can be separated by using the physical properties of the mixture. Which would be the best way to separate a mixture made of salt and water?

a)

evaporation

b)

chromotography

c)

magnetism

d)

filtering

34.

Which is an example of a chemical change?

a)

baking a cake

b)

ripping paper

c)

stretching a rubber band

d)

chopping wood

35.

Which of the following options provides evidence of a CHEMICAL change?

a)

Wood is burned releasing ash and smoke

b)

Rocks separate when soil is sifted

c)

Boiling water bubbles when heated

d)

Salt dissolves in water

36.

Use the basic properties of solids, liquids, and gases to identify the correct state of matter in the image.

a)

(A) gas, (B) liquid, (C) solid

b)

(A) solid, (B) liquid, (C) gas

c)

(A) liquid, (B) solid, (C) gas

d)

(A) solid, (B) gas, (C) liquid

37.

What is physical change?

a)

How two chemicals react with one another when combined

b)

A property that we can measure or observe with our 5 senses or other tools

c)

When two chemicals react with one another to form a new substance

d)

When a change occurs but it does not result in the formation of a new substance

38.

Flammability means the ability to _______ and is a _________ property.

a)

melt; chemical

b)

rust; physical

c)

change; physical

d)

burn; chemical

39.

Which of the following is not a chemical property? 

a)
rusting 
b)
boiling 
c)
rotting 
d)
burning 
40.

Which one of these is a chemical property?

a)
melting point
b)

magnetism

c)

ductility

d)

acidity

41.

All of the following are examples of physical properties EXCEPT

a)

density

b)

heat conductivity

c)

pH (acidic or basic)

d)

boiling point

42.

Which of the following is a chemical property of water?

a)

reacts with pure sodium

b)

boils at 100 oC

c)

is liquid at room temperature

d)

has a density of 1 g/mL

43.

What is the outcome of observing a chemical property?

a)

nothing

b)

a new substance is formed with different properties

c)

a change in state

d)

a rise in thermal conductivity

44.
Melting Point: Chemical or Physical Property
a)
Chemical Property
b)
Physical Property
45.

The image above represents which model of the atom?

a)

The watermelon model

b)

The solid sphere model

c)

The quantum model

d)

The plum pudding model

46.

Protons have a (a)   charge.

47.

Protons and neutrons are located in the (a)   of an atom.

48.

Which Scientist said, Everything is made of tiny particles surrounded by empty space

a)

Democritus

b)

Aristotle

c)

John Dalton

d)

JJ. Thompson

49.

Which Scientist said, Uniform spheres of positive charges surrounded by electrons.

a)

Democritus

b)

Aristotle

c)

John Dalton

d)

JJ. Thompson

50.

Which Scientist performed the Gold foil experiment. Determined that Atoms are mostly empty space with a nucleus.

a)

Ernest Rutherford

b)

Niels Bohr

c)

John Dalton

d)

JJ. Thompson

51.

This Scientist model is the most common. They said electrons orbit nucleus at fixed energy levels

a)

Ernest Rutherford

b)

Niels Bohr

c)

John Dalton

d)

JJ. Thompson

52.

This scientist mathematically determined the position of electron orbits.

a)

Ernest Rutherford

b)

Niels Bohr

c)

Werner Heisenberg

d)

Erwin Schrodinger

53.
Rutherford's gold foil experiment provided evidence that...
a)
Negative and positive charges are spread evenly throughout the atom.
b)
Alpha particles have a positive charge.
c)
Gold is not a dense as previously thought.
d)
There is a dense positively charged nucleus at the center of an atom.
54.
J.J. Thomson provided evidence that an atom...
a)
is the smallest particle of matter
b)
contains negatively and positively charged particles
c)
has an overall negative charge
d)
has an overall positive charge
55.
What contribution did John Dalton make to atomic theory? 
a)
He discovered that every atom was positively charged. 
b)
He discovered that every element consisted of one type of atom.  
c)
He discovered that atoms had nuclei. 
d)
He discovered that atoms could be divided into smaller parts. 
56.
Which is the correct sequence of the scientists who made major changes in the model of the atom?
1-JJ Thomson
2-Erwin Schrodinger
3-John Dalton
4-Niels Bohr
5-Ernest Rutherford
a)
2, 1, 4, 3, 5
b)
3, 1, 5, 4, 2
c)
5, 3, 2, 1, 4
d)
4, 3, 2, 1, 5
57.
The word atom comes from a Greek word "atomos" that means
a)
Invisible
b)
Indivisible
c)
Undivided
d)
Indestructable 
58.
A change where one or more new substances are created.
a)
Physical Change 
b)
Chemical Change 
59.

Mass divided by volume is the formula for calculating----

a)

Mass

b)

Volume

c)

Density

d)

Matter

60.

How many electrons are in Potassium

a)

19

b)

39

c)

20

d)

58

61.

How many neutrons are in magnesium?

a)

12

b)

24

c)

25

d)

36

62.

What is the best mass number for silver?

a)

47

b)

107

c)

108

d)

154

63.

What is the symbol for arsenic?

a)

A

b)

As

c)

33

d)

75

64.

How many neutrons does beryllium have?

a)

4

b)

5

c)

9

d)

13

65.

Which particles are found in the nucleus of an atom?

a)

protons only

b)

neutrons only

c)

protons & electrons

d)

protons & neutrons

66.

How do you find the number of neutrons in an atom?

a)

It's the same as the atomic #

b)

It's the same as the mass number

c)

Subtract the atomic # from the mass number

d)

Add the mass number and the atomic #

67.

How many electrons are in Aluminium?

a)

40

b)

27

c)

13

d)

14

68.

How many protons are in Chlorine?

a)

35

b)

18

c)

17

d)

52

69.

Which type of particle would you find floating around the nucleus, outside of the atom with its negative charges?

a)

Proton

b)

Neutron

c)

Electron

d)

Nucleus

70.

Which charge is POSITIVE?

a)

Proton

b)

Neutron

c)

Electron

d)

Cell

71.

Which charge is NEGATIVE?

a)

Proton

b)

Neutron

c)

Electron

d)

Cell

72.

Which particle is NEUTRAL - NO CHARGE?

a)

Proton

b)

Neutron

c)

Electron

d)

Cell

73.

What is the ATOMIC # (number on top) of Oxygen- O?

a)

6

b)

7

c)

8

d)

9

74.

How many PROTONS & ELECTRONS does Neon- Ne have?

a)

7

b)

8

c)

9

d)

10

75.

How many PROTONS / ELECTRONS does Potassium- K have?

a)

11

b)

19

c)

37

d)

87

76.

Which TWO particles are found housed in the nucleus of the atom?

a)

Protons and Electrons

b)

Protons and Neutrons

c)

Electrons and Neutrons

d)

Protons, Neutrons, and Electrons

77.

The number of protons in the nucleus of an atom is called the --

a)

atom

b)

proton

c)

atomic mass number

d)

atomic number

78.

Is this model of a molecule or atom?

a)

Atom

b)

Molecule

79.
What is the basic unit of matter and is the smallest particle of an element?
a)
Atoms
b)
Elements
c)
Compounds
d)
Molecules
80.

How many carbon atoms are there in a methane (CH4) molecule? 

a)
0
b)
1
c)
4
d)
5
81.
What is the total number of atoms in an ammonia (NH3) molecule?
a)
1
b)
2
c)
3
d)
4
82.
How many hydrogen atoms are in a molecule of glucose/sugar (C6H12O6)?
a)
6
b)
12
c)
18
d)
24
83.

In this picture, there are

a)

only atoms

b)

only molecules

c)

A mixture of atoms and molecules

84.
Carbon is considered an element while carbon dioxide is considered a compound. This is because carbon dioxide is –
a)
a gas at room temperature.
b)
made of two different elements.
c)
given off by green plants.
85.
This picture represents which of the following?
a)
element
b)
compound
c)
mixture

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