WorksheetsChemical Reactions Review
Total questions: 51
Worksheet time: 26mins
Name
Class
Date
1.
In an exothermic reaction, heat is ...
a)
taken in
b)
given out
2.
In an endothermic reaction, heat is ,,,
a)
taken in
b)
given out
3.
What type of reaction occurs in a hand warmer
a)
exothermic
b)
endothermic
4.
What are the molecules for water
a)
H2
b)
O2
c)
Cl2
d)
H2O
5.
Exothermic reactions...
a)
Absorb energy
b)
Release energy
c)
Release Color
d)
Absorb Color
6.
What is a Chemical Reaction?
a)
When two liquids hit each other
b)
When a liquid has foam
c)
When two substances mix and have a reaction
d)
When a reaction forms with soda and candy
7.
What is an atom?
a)
A name for children
b)
The smallest building block of Earth
c)
The rubrics cube
d)
The stuff that builds up mankind
8.
The particles that make up an atom are _.
a)
Electrons, protons, and nuclei
b)
Elements, protons, and electrons
c)
Protons, neutrons, and nuclei
d)
Proteons,nutrons, and electrons
9.
In an atom, electrons_.
a)
Are located in the nucleus
b)
Arempaired with nutrons
c)
Travel outside the nucleus
d)
Are always in the same place in an atom
10.
A chemical reaction that produces energy is a /an
a)
endothermic reaction
b)
exothermic reaction
c)
energy
d)
chemical reaction
11.
A chemical reaction that requires energy is a
a)
exothermic reaction
b)
endothermic reaction
c)
over reaction
12.
What are the positively charged particles in an atom called?
a)
Protons
b)
Neutrons
c)
Electrons
d)
Nucleus
13.
What two molecules are located inside of the nucleus of an atom?
a)
Electrons and Neutrons
b)
Protons and Electrons
c)
Protons and Neutrons
14.
How many protons does Helium have?
a)
4
b)
4.0026
c)
2
d)
1
15.
Which type of element is shiny, ductile and malleable?
a)
metal
b)
nonmetal
c)
metalloid
d)
play dough
16.
When two or more elements join together chemically,
a)
a mixture is formed
b)
nothing is formed
c)
a compound is formed
17.
Salt dissolved in water is an example of:
a)
colloid
b)
solution
c)
element
18.
In a Chemical Reaction, the Law of Conservation of Mass states?
a)
Matter is present.
b)
Matter is NOT created or destroyed.
c)
Matter is created and destroyed.
19.
Which is NOT an example of chemical change?
a)
production of gas.
b)
change in color.
c)
change in size.
d)
transfer of energy.
20.
Which is an example of a physical property?
a)
rusting
b)
boiling point
c)
combustion
d)
reactivity with water
21.
Flammability is an example of what property?
a)
Chemical property
b)
Physical property
22.
What type of property is the ability to combust?
a)
Physical property
b)
Chemical property
23.
This is an example of a
a)
physical change
b)
chemical change
24.
Ability to rust is this type of property:
a)
Physical property
b)
Chemical property
25.
Which is an example of a physical property?
a)
ability to react with acid
b)
color
c)
flammability
d)
ability to react with oxygen
26.
Which is NOT a physical property?
a)
odor
b)
reacts with bleach
c)
sinks in water
d)
density
27.
Physical properties are
a)
properties that can be observed without changing the identity of the substance
b)
properties that describe how a substance changes into a completely different substance
c)
properties that we can only observe with our eyes
d)
properties that we need special tools to observe
28.
Which of the following is a physical property?
a)
melting point
b)
flammability
29.
Which of the following is a chemical property?
a)
how something tastes
b)
ability to explode
c)
ability to float in water
d)
size of an object
30.
Which type of property is the ability to conduct electricity?
a)
physical property
b)
chemical property
31.
Properties that can be observed without trying to change the identity of the substance.
a)
Physical
b)
Chemical
32.
What kind of properties can only be observed when a substance changes into a different substance?
a)
physical properties
b)
chemical properties
c)
liquid properties
d)
real properties
33.
all matter is made of what
a)
energy
b)
atoms
c)
electrons
d)
compounds
34.
The positive particles of an atom are
a)
electrons
b)
positrons
c)
neutrons
d)
protons
35.
the central region of an atom where its neutrons and protons are is its
a)
nucleus
b)
electron cloud
c)
core
d)
center
36.
an atom with atomic number 6 would have how many protons
a)
6
b)
12
c)
3
d)
cannot be determined
37.
Particles in an atom that are neutral and have no charge are
a)
negatrons
b)
electrons
c)
neutrons
d)
protons
38.
A section of the Periodic Table of Elements is provided. What is the chemical symbol for magnesium?
a)
12
b)
Mg
c)
24.31
d)
Magnesium
39.
The particles of a _ are loosely packed and roll/slide past each other. (1.1)
a)
Solid
b)
Liquid
c)
Gas
40.
The particles of a _ are tightly packed and vibrate in place. (1.1)
a)
Solid
b)
Liquid
c)
Gas
41.
The particles of a _ bounce and collide into other. (1.1)
a)
Solid
b)
Liquid
c)
Gas
42.
(1.2)
a)
Solid
b)
Liquid
c)
Gas
43.
(1.2)
a)
Solid
b)
Liquid
c)
Gas
44.
what does the 6 represent?
a)
Atomic mass
b)
atomic number
c)
chemical symbol
d)
element name
45.
What does the C represent?
a)
atomic mass
b)
atomic number
c)
element name
d)
chemical symbol
46.
Most of an atom is empty space.
a)
True
b)
False
47.
Atoms of different elements have different numbers of protons.
a)
True
b)
False
48.
What part of the atom is the arrow pointing to?
a)
electron
b)
nucleus
c)
neutron
d)
proton
49.
What part of the atom is the arrow pointing to?
a)
electron shell
b)
neutron
c)
proton
d)
electron
50.
What part of the atom is the arrow pointing to?
a)
nucleus
b)
proton
c)
electron shell
d)
electron
51.
What part of the atom is the arrow pointing to?
a)
neutron
b)
nucleus
c)
proton
d)
electron
100 %
