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WorksheetsAtoms, elements, molecules review
Total questions: 35
Worksheet time: 21mins
Name
Class
Date
1.
Krypton's chemical formula is Kr, Kr is a(n) ______?
a)
Element
b)
Compound
c)
Molecule
d)
Mixture
2.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
3.
Which equation obeys the law of conservation of mass?
a)
H2 + O2 ------> H20
b)
C + H4 ----> CH4
c)
2Fe2O3 ------> 2O2 + 4Fe
4.
Which statement about the atomic nucleus is correct?
a)
The nucleus is made of protons and neutrons and has a negative charge
b)
The nucleus is made of protons and neutrons and has a positive charge
c)
The nucleus is made of electrons and has a positive charge
d)
The nucleus is made of electrons and has a negative charge
5.
Small positively charged particles that are found in the nucleus of an atom
a)
neutron
b)
ion
c)
proton
d)
electron
6.
A tiny, negatively charged particle that moves around the outside of the nucleus of an atom
a)
ion
b)
proton
c)
electron
d)
neutron
7.
An element is composed of how many types of atoms?
a)
5
b)
3
c)
1
8.
All matter is made of what?
a)
energy
b)
atoms
c)
electrons
d)
compounds
9.
This diagram shows molecules before and after a chemical reaction, which statement is correct
a)
because there are 14 atoms before the reaction there are 14 after
b)
because there are 7 molecules before the reaction there are 7 after
c)
there are 4 blue atoms and 12 light blue before, and the same after
d)
because there were 7 molecules before and 4 after
10.
The particles that are found in the nucleus of an atom are
a)
neutrons and electrons
b)
electrons only
c)
protons and neutrons
d)
protons and electrons
11.
A particle that moves around the nucleus is a(n)...
a)
Proton
b)
Neutron
c)
Electron
d)
Quark
12.
Many structures of molecules are composed of layers. Which would describe the next layer going on top?
a)
it will match the bottom layer
b)
It will contain 4 of the red atoms
c)
It will contain 4 of the blue atoms
d)
It will contain 2 of the red and 2 of the blue atoms
13.
Which is the smallest?
a)
worm
b)
molecule
c)
galaxy
d)
atom
14.
Anything that has mass and takes up space is called
a)
air
b)
water
c)
matter
d)
stuff
15.
Which subatomic particle has a neutral charge?
a)
Proton
b)
Neutron
c)
Electron
16.
Matter always has mass.
a)
true
b)
false
17.
The smallest part of an element is known as the
a)
molecule
b)
Atom
c)
cell
d)
droplet
18.
Which is the chemical formula for water?
a)
H2O
b)
H2O2
c)
HO2
d)
HO
19.
What is the Conservation of Mass?
a)
Nothing is lost, Nothing is Created, Everything is tranformed
b)
The Law states that Nothing is transformed
20.
The measure of the amount of matter in an object
a)
mass
b)
density
c)
volume
21.
Which is bigger, an atom or a molecule
a)
atom
b)
molecule
22.
Compare the molecules. Which statement best compares the atomic composition of the models
a)
Same elements used but different number of atoms
b)
Molecules contain the same number of atoms but elements are different
c)
All the molecules are the same
d)
The molecules only differ in the number of hydrogen atoms
23.
Sally and her classmates were asked to write the definition of matter. Sally had correctly defined matter. Knowing that, which definition did Sally write?
a)
Matter is anything that has mass and takes up space.
b)
Matter is anything that has mass and does not take up space.
c)
Matter does not have mass but does take up space.
d)
Matter neither takes up space nor has mass.
24.
Define properties
a)
distinguishing qualities of an object
b)
what an object is made of
25.
Lead can be deadly if it is ingested by people especially small children. It is no longer used in paint because it effects the body. Which system of the body is most affected by lead poisoning?
a)
digestive system
b)
nervous system
c)
respiratory system
d)
circulatory system
26.
What is a single particle of matter made up of with two or more atoms joined together?
a)
atom
b)
matter
c)
molecule
d)
physical matter
27.
Joe sees salt on the counter the chemical formula for salt is NaCl. What is the salt?
a)
molecule
b)
Mixture
c)
Atom
d)
Element
28.
Mass is the _________of matter and volume is the ___________ it takes up.
a)
molecule material
b)
amount, space
29.
What is a pure substance?
a)
A pure substance is made from different types of atoms and molecules.
b)
A pure substance is made from one type of atom or one type of molecule.
30.
A substance made of only one type of atom is a(n)
a)
molecule
b)
compound
c)
element
d)
proton
31.
Can atoms can be broken down into simpler particles?
a)
Yes, protons and neutons
b)
No they can not
c)
Yes, electrons and protons
d)
Yes, neutrons and electrons
32.
The chemical formula for ethylene is C2H4. Which statement is true about ethylene>
a)
ethylene contains 4 atoms
b)
ethylene contains 2 atoms
c)
ethylene contains 6 elements
d)
ethylene contains 2 elements
33.
How many atoms are in the chemical butane-C4H10 ?
a)
2
b)
10
c)
4
d)
14
34.
Here are 3 molecules before a chemical reaction
⊕⊕+⊕Θ+⊕Θ
What should they look like after the reaction?
⊕⊕+⊕Θ+⊕Θ
What should they look like after the reaction?
a)
⊕⊕Θ + ⊕Θ
b)
⊕⊕⊕ + ⊕Θ
c)
⊕Θ⊕ + ⊕Θ⊕
d)
ΘΘ⊕ + ΘΘ⊕⊕⊕
35.
Maddy was asked to draw a diagram of NH3 what should she draw?
a)
3 NH atoms
b)
1 N atom and 3 H atoms
c)
3 N atoms and 3 H atoms
d)
1 NH atom
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