WorksheetsCFB 8th Chemistry
Total questions: 32
Worksheet time: 16mins
Name
Class
Date
1.
Ice melting is an example of...
a)
physical change like burning wood
b)
physical change like cutting paper
c)
chemical change like dissolving sugar
d)
chemical change like rust
2.
This happens in a chemical reaction:
a)
bonds break
b)
atoms rearrange
c)
new bonds are formed
d)
all of the above
3.
The formation of solid particles in a substance is called:
a)
precipitate
b)
dissolving
c)
sugar
d)
koolaid
4.
If you see a precipitate, then what has likely occurred?
a)
a physical change like rust
b)
a chemical change like tarnishing silver
c)
a physical change like dissolving sugar
d)
a chemical change like melting butter
5.
A bike was left outside and the iron reacted with the oxygen in the air and rust formed. This is an example of:
a)
a physical change like chewing food
b)
a physical change like digesting food
c)
a chemical change like baking a cake
d)
a chemical change like cracking an egg
6.
An element is:
a)
two or more types of atoms
b)
only one kind of atom
c)
two or more capital letters
d)
a type of compound
7.
When elements form compounds....
a)
they look the same
b)
their properties change
c)
they become poisonous
d)
they explode
8.
Element or Compound? Fe2O3
a)
Element
b)
Compound
9.
Element or Compound? Au
a)
Element
b)
Compound
10.
A compound is:
a)
only one kind of atom
b)
two or more kinds of atoms
c)
on the Periodic Table
d)
a physical change
11.
Is CO2 on the Periodic Table?
a)
Yes, because it's an element
b)
Yes, because it's a compound
c)
No, because it's an element
d)
No, because it's a compound
12.
A proton's charge is...
a)
negative
b)
neutral (no charge)
c)
positive
d)
electrical
13.
An electron's charge is...
a)
positive
b)
negative
c)
neutral (no charge)
d)
atomic mass
14.
A neutron's charge is...
a)
positive
b)
negative
c)
neutral (no charge)
d)
electrical
15.
The charge of an atom's nucleus is...
a)
positive
b)
negative
c)
neutral (no charge)
d)
one
16.
What is located in the nucleus?
a)
electrons and protons
b)
electrons and neutrons
c)
protons and neutrons
d)
protons only
17.
Where are the electrons located?
a)
in the nucleus with the protons
b)
in the nucleus with the neutrons
c)
in the electron cloud
d)
in the neutron cloud
18.
How do you calculate the atomic mass?
a)
protons minus electrons
b)
protons plus neutrons
c)
electrons plus protons
d)
neutrons plus electrons
19.
The number of protons is the same as the...
a)
atomic mass
b)
group #
c)
period #
d)
atomic #
20.
How do you calculate the # of neutrons?
a)
Atomic mass minus atomic #
b)
Atomic mass minus electrons
c)
Protons plus neutrons
d)
Protons minus electrons
21.
Groups on the Periodic Table are...
a)
horizontal (across)
b)
vertical (up and down)
c)
in order of atomic #
d)
all gases
22.
Periods on the Periodic Table are...
a)
horizontal (across)
b)
vertical (up and down)
c)
diagonal lines
d)
zigzag lines
23.
What element is in everything biotic?
a)
hydrogen
b)
oxygen
c)
carbon
d)
water
24.
Why are Carbon, Hydrogen, Nitrogen, Oxygen, Phosphorus, and Sulfur important?
a)
They make up CHNOPS
b)
They are on the Periodic Table
c)
They all have symbols
d)
They are all needed for life
25.
What are the biochemical elements?
a)
Carbon, Nitrogen, Gold, and Silver
b)
Carbon, Oxygen, Phosphorus, Tin, Helium, and Titanium
c)
Carbon, Hydrogen, Nitrogen, Oxygen, Phosphorus, and Sulfur
d)
Carlos Has New Orange Puma Shoes
26.
The elements on the left side of the metalloids are generally:
a)
reactive, good conductors, shiny
b)
less reactive, poor conductors, shiny
c)
reactive, dull, non-malleable
d)
brittle, ductile, poor conductor
27.
Elements with similar properties such as reactivity can be found in the same...
a)
period
b)
group
c)
periodic table
d)
chapter
28.
Elements on the right side of the metalloids are generally...
a)
brittle, good conductors
b)
poor conductors, shiny
c)
poor conductors, less reactive
d)
good conductors, less reactive
29.
The property of being malleable is
a)
the capacity to undergo a chemical change with other elements
b)
the capacity to be hammered or pressed out of shape without breaking
c)
the capacity to transfer heat or electricity
d)
the capacity to reflect light
30.
The property of being a conductor is
a)
the capacity to undergo a chemical change with other elements
b)
the capacity to be hammered or pressed out of shape without breaking
c)
the capacity to transfer heat or electricity
d)
the capacity to reflect light
31.
The property of reactivity is
a)
the capacity to undergo a chemical change with other elements
b)
the capacity to be hammered or pressed out of shape without breaking
c)
the capacity to transfer heat or electricity
d)
the capacity to reflect light
32.
The property of luster is
a)
the capacity to undergo a chemical change with other elements
b)
the capacity to be hammered or pressed out of shape without breaking
c)
the capacity to transfer heat or electricity
d)
the capacity to reflect light
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