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Worksheetsuntitled
Total questions: 91
Worksheet time: 1hrs 10mins
Name
Class
Date
1.
Which of the following is a sign that a chemical reaction has occurred?
a)
change in shape
b)
melting
c)
formation of a gas
d)
dissolving
2.
Is burning wood a chemical or physical change?
a)
chemical
b)
physical
3.
A change in the size, shape, or state of matter.
a)
chemical change
b)
physical change
c)
chemical reaction
d)
electron change
4.
Which of the following is NOT an example of a physical change?
a)
crumpled paper
b)
pencil sharpening
c)
shrunken clothing
d)
sour milk
5.
Four students performed four different investigations by combining different substances. Their results are shown in the table provided. In which experiment are new substances being formed?
a)
Experiment 1
b)
Experiment 2
c)
Experiment 3
d)
Experiment 4
6.
A clear liquid from a flask is poured into another clear liquid in a beaker. Which of the following results of this procedure would indicate a new substance was formed?
a)
The level of the substance in the beaker is higher after the other liquid is added.
b)
A yellow solid forms and then settles to the bottom of the beaker.
c)
Small white crystals are left behind in the flask that held the first liquid.
7.
Which of the following is an example that includes evidence of a chemical reaction?
a)
A sample of zinc is placed in water and it settles to the bottom
b)
A solid block of ice is heated and it completely melts into a liquid.
c)
Sugar that is burned gives off an odor and turns brown and then black.
d)
A tomato is placed into a blender and chopped up into smaller pieces.
8.
Evidence of a chemical reactions is anything that shows -
a)
a new substance has formed
b)
a solid dissolved in a liquid
c)
interaction between 2 gases
d)
a change in the state of matter
9.
A student observes some sugar as it is heated and burns. The student concludes that a chemical reaction has occurred. Which of the following observations about the burning sugar provides evidence of a chemical reaction?
a)
Heat is added to the sugar crystals.
b)
The sugar melts and becomes a liquid.
c)
Gas is produced as the sugar turns black.
d)
No evidence of chemical reaction is present.
10.
For an investigation a student poured a blue solution of CuSO4 into a beaker. The student placed a shiny, silver-colored strip of zinc metal in the solution and observed the changes.
The student inferred that a chemical reaction occurred. What evidence supports this inference?
The student inferred that a chemical reaction occurred. What evidence supports this inference?
a)
A dark solid formed on the zinc metal.
b)
The zinc metal remained silver-colored and shiny
The zinc metal remained silver-colored and shiny
c)
The CuSO4 solution turned blue when the zinc metal was added.
d)
None of these
11.
A scientist performed four investigations using eight different liquids. In each investigation, the scientist combined two of the liquids and recorded observations. In which investigation is it LEAST likely that the liquids reacted chemically?
a)
1
b)
2
c)
3
d)
4
12.
A copper penny turning greenish after a few years is an example of...
a)
Chemical Change
b)
Physical Change
13.
Which of the following IS a chemical change
a)
using chalk
b)
water freezing
c)
slicing cheese
d)
digestion
14.
How is a physical change different from a chemical change?
a)
There is absolutely no difference
b)
Chemical changes produce a new substance, physical changes stay the same substance
c)
Chemical changes create and destroy matter, physical changes don't
d)
Physical changes create and destroy matter, chemical changes dont
15.
A change in which NEW substances are formed.
a)
Chemical change
b)
Physical change
c)
Casual change
d)
Formal change
16.
The mass after a physical or chemical change stays the same
a)
True
b)
False
17.
Which of the following is a PHYSICAL change?
a)
Getting a haircut
b)
Rusty metal
c)
sour milk
d)
A compound
18.
A student places a piece of a potato into a container of hydrogen peroxide. One observation the student makes is that bubbles form around the potato. The presence of bubbles might indicate the formation of a new substance because bubbles -
a)
could show that a gas is forming
b)
always rise to the top of a liquid.
c)
are almost always perfectly spherical.
d)
usually burst after a few minutes.
19.
Hydrogen peroxide breaks down to form water and oxygen gas. Which observation is evidence that a chemical reaction has occurred?
a)
The mass of the solution remains the same.
b)
Phase changes are observed.
c)
The color of the solution remains clear.
d)
The temperature of the solution increases.
20.
Which of the following is NOT evidence that that a chemical reaction has occurred?
a)
produces light/heat
b)
production of a gas
c)
formation of a precipitate
d)
melting
21.
If reaction starts with 20g of reactants it should produce
a)
a total of 40g of products
b)
a total of 10g of products
c)
a total of 80 g of products
d)
a total of 20g of products
22.
What is the Law of Conservation of mass?
a)
Mass is created in a chemical reaction
b)
Mass is created in a physical change
c)
New chemicals formed from a chemical reaction have a larger overall mass than the original reactants
d)
Mass is never created or destroyed
23.
In an experiment, two flasks of unknown, clear liquids are combined in a beaker and the following observations are obtained:
I. Solution color remains clear;
II. The amount of solution in the beaker increased;
III. Solution temperature changed from 10C to 20C; and
IV. Some of the liquid remained in the flasks.
How many of the listed observations indicate a new substance was formed?
a)
1
b)
2
c)
3
d)
4
24.
A precipitate is a
a)
liquid that forms when two solids are reacted
b)
a solid that forms when two liquids are mixed
c)
a gas that forms when vinegar and baking soda react
d)
a change of color in a solution
25.
Check every box that identifies evidence of chemical reactions?
a)
Changes the state of matter
b)
Color change (Unexpected)
c)
Gas, bubbles or fizzing
d)
Emits light, sound or heat
e)
Precipitate
26.
A granular substance is added to a liquid. Which of the following would provide evidence to suggest a chemical change has taken place?
a)
The liquid gives off heat.
b)
The granules dissolve completely.
c)
The volume of the liquid increases.
d)
The granules seem to get smaller.
27.
Which observation(s) might be used as evidence that a chemical reaction occurred?
a)
Color change
b)
Odor change
c)
Properties change
d)
All of the above
28.
When a scientist mixed two chemicals, an exothermic reaction takes place. Which of the following would be proof that the reaction was exothermic?
a)
a change of color
b)
a change of state
c)
a temperature decrease
d)
a temperature increase
29.
Which of the following is a chemical change?
a)
water freezes to form ice
b)
sugar dissolves in water
c)
gasoline burns in a car engine
d)
a piece of metal expands when it is heated
30.
In any chemical reaction, the mass of the products is always:
a)
slightly less than the mass of the reactants
b)
much less than the mass of the reactants
c)
the same as the mass of the reactants
d)
greater than the mass of the reactants
31.
Which is the name of the kind of solid substance formed in this figure?
a)
aqueous
b)
precipitate
c)
acid
d)
synthesis
32.
Which observation(s) might be used as evidence that a chemical reaction occurred?
a)
Color change
b)
Odor change
c)
Properties change
d)
All of the above
33.
________ result(s) in no new substances.
a)
A physical change
b)
A chemical change
c)
Physical and chemical changes
d)
None of the above
34.
Which is an example of a physical change?
a)
Burning wood
b)
Freezing water
c)
Rust on a car
d)
Cooking food
35.
Which is an example of a chemical change?
a)
Burning wood
b)
Rust on a car
c)
Cooking food
d)
All of the above
36.
Which of the following help a chemical reaction to happen faster?
a)
Molecule
b)
Atom
c)
Catalyst
d)
Density
37.
Hydrogen peroxide breaks down to form water and oxygen gas. Which observation is evidence that a chemical reaction has occurred?
a)
The mass of the solution remains the same.
b)
Phase changes are observed.
c)
The color of the solution remains clear.
d)
The temperature of the solution increases.
38.
A clear liquid from a flask is poured into another clear liquid in a beaker. Which of the following results of this procedure would indicate a new substance was formed?
a)
The level of the substance in the beaker is higher after the other liquid is added.
b)
A yellow solid forms and then settles to the bottom of the beaker.
c)
Small white crystals are left behind in the flask that held the first liquid.
39.
Evidence of a chemical reactions is anything that shows -
a)
a new substance has formed
b)
a solid dissolved in a liquid
c)
interaction between 2 gases
d)
a change in the state of matter
40.
A precipitate is a
a)
liquid that forms when two solids are reacted
b)
a solid that forms when two liquids are mixed
c)
a gas that forms when vinegar and baking soda react
d)
a change of color in a solution
41.
If reaction starts with 20g of reactants it should produce
a)
a total of 40g of products
b)
a total of 10g of products
c)
a total of 80 g of products
d)
a total of 20g of products
42.
The substances at the beginning of a chemical equation are called the ____
a)
product
b)
yield
c)
chemical symbol
d)
reactants
43.
In a chemical reaction, everything to the right of the arrow is called ______________.
a)
Products
b)
Yields
c)
Molecules
d)
Reactants
44.
In the equation, 2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
45.
In a ___________change, a substance changes into a different substance.
a)
Physical
b)
Chemical
46.
Which of these is NOT a sign that a chemical change has occurred?
a)
A loss of transparency
b)
An unexpected color change
c)
A temperature change
d)
The formation of a precipitate
47.
An gel ice pack getting cold after you put it in the freezer for an hour.
a)
Chemical Change
b)
Physical Change
48.
Rotting Fruit (Like a brown banana)
a)
Physical Change
b)
Chemical Change
49.
Burning Wood
a)
Physical Change
b)
Chemical Change
50.
Toasting Bread
a)
Physical Change
b)
Chemical Change
51.
Which is not a sign that a chemical reaction has occurred.
a)
A change in mass
b)
bubbling
c)
production of an odor or smell
d)
change in color
52.
Which is not evidence that a chemical reaction has occured
a)
Production of flames
b)
Change in temperature or heat
c)
freezing
d)
Production of light
53.
_______________ is an example of both a color change and new substance produced from a chemical change with oxygen and metal.
a)
shredded paper
b)
rust (iron oxide)
c)
wood chips
d)
melted wax
54.
What kind of change occurs if matter changes in amount, size, or shape?
a)
substance change
b)
chemical change
c)
physical change
d)
elemental change
55.
Which example best describes a physical change?
a)
iron rusting
b)
charcoal burning
c)
an ice cube melting
d)
a marshmallow burning
56.
Glass bottle that is shattered
a)
Chemical Change
b)
Physical Change
57.
Baking soda and vinegar combine to make carbon dioxide
a)
Chemical Change
b)
Physical Change
58.
Grass growing in a lawn
a)
Chemical Change
b)
Physical Change
59.
A physical change _____________ the identity of the substance.
a)
changes
b)
maintains
60.
A chemical change _____________ the identity of the substance.
a)
changes
b)
maintains
61.
Copper tarnishing is an example of a ___________ change.
a)
physical
b)
chemical
62.
A combination of chemical symbols to represent a substance is a:
a)
chemical formula
b)
chemical bond
c)
chemical reaction
d)
chemical equation
63.
An interaction that holds atoms or ions together is a:
a)
chemical formula
b)
chemical bond
c)
chemical equation
d)
chemical reaction
64.
A pure substance composed of all the same type of atoms is called:
a)
compound
b)
element
c)
molecule
d)
atom
65.
A substance consisting of two or more different types of atoms chemically bonded together is called:
a)
compound
b)
element
c)
atom
d)
molecule
66.
A stable unit of two or more atoms held together by chemical bonds is called:
a)
compound
b)
element
c)
molecule
d)
atom
67.
The ability of an atom or molecule to undergo a chemical reaction with another atom, molecule or compound:
a)
reactant
b)
product
c)
reactivity
d)
stability
68.
A representation of a chemical reaction that uses symbols to show the relationship between the reactants and products:
a)
chemical formula
b)
chemical reaction
c)
chemical equation
d)
chemical bond
69.
Materials that are present at the end of a reaction are called:
a)
products
b)
reactants
c)
molecules
d)
elements
70.
Any substance that undergoes a chemical change in a given reaction is called:
a)
product
b)
reactant
c)
molecule
d)
atom
71.
The process in which atoms are rearranged and chemical bonds are broken and formed to produce a chemical change of a substance is called:
a)
chemical formula
b)
chemical bond
c)
chemical reaction
d)
chemical equation
72.
Which scientific law states that an atom cannot be created or destroyed:
a)
Law of Conservation of Matter
b)
Law of Gravity
c)
Law of Conservation of Mass
d)
Law of Motion
73.
At the end of a chemical reaction a completely new substance is formed.
a)
TRUE
b)
FALSE
74.
Is this chemical equation balanced or unbalanced?
a)
Balanced
b)
Unbalanced
75.
How many Hydrogen atoms are in this chemical formula?
a)
6
b)
24
c)
12
d)
o
76.
What elements make up this chemical formula?
a)
Carbon, Helium, Oxygen
b)
Cobalt, Hydrogen, Oxygen
c)
Carbon, Hydrogen, Oxygen
d)
Carbon, Helium, Oxygen, Helium
77.
This atom would be classified as highly reactive.
a)
TRUE
b)
FALSE
78.
When mixing two unknown substances the mixture begins to increase in temperature. Is this evidence of a chemical reaction?
a)
YES
b)
NO
79.
All of the following EXCEPT for which one is evidence of a chemical reaction.
a)
Precipitate Formation
b)
Gas Production
c)
Light Production
d)
Changes in State of Matter
80.
Is ice melting evidence of a chemical reaction?
a)
YES
b)
NO
81.
In a chemical equation the compounds on the left side of the yield sign are called?
a)
Products
b)
Reactants
82.
In a chemical equation the compounds on the right side of the yield sign are called?
a)
Products
b)
Reactants
83.
During a lab investigation two substances are mixed together and give off a strange odor. Is this a sign of a chemical reaction?
a)
yes
b)
no
84.
A piece of gold jewelry is melted over a flame and becomes a liquid. Is this a sign of a chemical reaction?
a)
yes
b)
no
85.
In the acronym "Country Girls Love Their Phones" the "P" in phones stands for what?
a)
paper formation
b)
precipitate formation
c)
purple color
d)
phosphorus formation
86.
In the acronym "Country Girls Love Their Phones" the "G" stands for what?
a)
gas production
b)
green color
c)
gone
d)
gallium production
87.
In the acronym "Country Girls Love Their Phones" the "C" stands for what?
a)
color change
b)
calcium deposit
c)
changing matter
d)
chemical reaction
88.
In the acronym "Country Girls Love Their Phones" what does the "L" stand for?
a)
liquid formation
b)
light production
c)
less matter
d)
lasting reaction
89.
In the acronym "Country Girls Love Their Phones" what does the "T" stand for?
a)
transforming substance
b)
testing substances
c)
temperature change
d)
trace particles
90.
The big number in front of a chemical formula is called a coefficient and tells you the number of molecules.
a)
TRUE
b)
FALSE
91.
The little drop down number after an element symbol in a chemical formula is called a subscript. It tells you how many atoms of that element are in the molecule.
a)
TRUE
b)
FALSE
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