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WorksheetsIntroduction to Chemistry
Total questions: 40
Worksheet time: 20mins
Everything in the universe is made of .....
cotton
oxygen
electricity
atoms
Most of an atom is made of ......
empty space
air
water
electrons
Groups of atoms that are chemically combined are called......(select all correct answers)
protons
molecules
compounds
neutrons
Atoms are made up of smaller parts called.....
molecules
compounds
Newtons
subatomic particles
The subatomic particle with a positive electric charge is called......
proton
neutron
electron
atom
The subatomic particle with a negative electrical charge is called ......
proton
neutron
electron
gram
The subatomic particle with a neutral (no) charge is called a .........
electron
x-ray
neutron
protn
Which subatomic particles are located inside the nucleus
electrons and protons
protons and neutrons
electrons and neutrons
Which subatomic particles are located outside of the nucleus?
electrons
protons
neutrons
What is the atomic number of Carbon?
4
5
6
7
What is the atomic mass of Nitrogen?
1.4
13
14
15
How many electrons does Sodium have?
10
11
12
22
How many electrons can be located on the first shell?
1
2
3
8
How many electrons can be located on the 2nd and 3rd shells?
2
4
6
8
How many different types of atoms can an element be made of?
only 1
two or more
three or more
none
How many atoms are in a molecule?
only 1
2 or more
none
What is a molecule that is made of 2 or more different types of atoms called?
element
atom
compound
Is CO2 an element or a compound?
element
compound
Is O3 and element or a compound?
element
compound
Is Cu an element or a compound?
element
compound
Is CO an element or a compound?
element
compound
How many atoms are in the following compound: CaCl2
2
3
4
6
How many atoms are in the following compound: 2PbNO3
2
5
10
12
How many atoms are in the following compound: Au(HO3)2
3
9
15
10
How many atoms are in the following compound: 2Al(C2H3O2)2
10
20
30
40
Which law states the following: Matter cannot be created or destroyed in regular chemical reactions.
conservation of mass
conservation of atoms
loss of mass
combination of mass
If 5g of CO2 reacts with 10g of H, what is the mass of the product?
5g
20g
15g
25g
?g Na + 40g Cl produces 70g NaCl
10g
40g
0g
30g
According to the law of conservation of mass, the total mass of the products is always ___________ the total mass of the reactants.
larger than
greater than
equal to
random
True of False: All changes in matter follow the Law of Conservation of Mass
True
False
A change in matter where there is NO NEW substances formed. Sometimes are reversible.
physical change
chemical change
A change in matter where NEW substances are formed and chemical composition is changed.
physical change
chemical change
Physical or Chemical Change: burning wood
physical change
chemical change
Physical or Chemical Change: making fresh lemonade
physical change
chemical change
Physical or Chemical Change: water vapor condenses into clouds
physical change
chemical change
Water becomes a gas is called.....
evaporation
condensation
sublimation
precipitation
A liquid becoming a solid is called......
evaporation
condensation
freezing
precipitation
Water vapor becoming a liquid is called....
evaporation
condensation
freezing
sublimation
A liquid becoming a solid is called......
sublimation
evaporation
condensation
freezing
A solid directly becoming a gas is called......
evaporation
sublimation
condensation
freezing
