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Worksheets8.P.1.1 & 8.P.1.3 Practice
Total questions: 30
Worksheet time: 15mins
Name
Class
Date
1.
Which is the best description of one particle of table salt (NaCl)?
a)
atom
b)
compound
c)
element
2.
Which is the best example of a pure substance?
a)
peanuts
b)
milk
c)
gold
d)
air
3.
How can mixtures best be described?
a)
made of one element
b)
made of different elements that are all chemically bonded together
c)
made of different elements that are not all chemically bonded together
4.
Which chemical formula is an example of a compound?
a)
O2
b)
2Cl
c)
H2SO4
5.
Why is carbon an element and not a compound?
a)
All carbon atoms have the same number of protons.
b)
Carbon bonds easily with oxygen, but not helium.
c)
Carbon is found in all living organisms.
6.
Hydrogen peroxide (H2O2 ) and water (H2O) both contain hydrogen(H) and oxygen (O). Why are they different compounds?
a)
Hydrogen peroxide contains one more oxygen than water.
b)
Hydrogen peroxide contains two more oxygens than water.
c)
Hydrogen peroxide contains one less oxygen than water.
7.
Which is a mixture?
a)
H2O
b)
salad
c)
table salt
8.
Water (H2O) and table salt (NaCl) can be combined to form salt water. How can this combination be classified?
a)
as a compound because the water (H2O) and table salt (NaCl) arechemically combined
b)
as a compound because the water (H2O) and table salt (NaCl) form anew pure substance
c)
as a mixture because the water (H2O) can be evaporated andphysically separated from the table salt (NaCl)
9.
Which substance is composed of only one type of atom?
a)
element
b)
mixture
c)
solution
10.
How many elements are in one molecule of glucose (C6H12O6 )?
a)
1
b)
3
c)
6
11.
What general category describes the majority of the elements in theperiodic chart?
a)
metals
b)
liquids
c)
nonmetals
12.
Which best describes the classification of an element that is a shinysolid, conducts electricity, and has an atomic mass of approximately 108?
a)
It is a metal
b)
It is synthetic
c)
It is a metalloid
13.
Which conclusion can be made about calcium and magnesium in thesame group on the periodic table?
a)
They are both reactive metals
b)
They both have complete outer shells.
c)
They are both semi-conductors of heat and electricity.
14.
What do all the noble gases on the periodic table have in common?
a)
They are generally highly reactive.
b)
They are generally metalloids.
c)
They are generally unreactive.
15.
How many protons are in a sodium atom?
a)
Sodium has 1 proton.
b)
Sodium has 3 protons.
c)
Sodium has 11 protons
16.
Which best explains why scientists have arranged elements number 57 to 102 apart from the rest of the elements of the periodic table?
a)
They all have unique properties that set them apart.
b)
They are all radioactive.
c)
They are all synthetic.
17.
What is the relationship between elements with 6, 14, and 82 protons in their nuclei on the periodic table of elements?
a)
They are in the same group.
b)
They are in the same period.
c)
They have the same atomic mass
18.
Tungsten fits best into which category?
a)
compound
b)
element
c)
mixture
d)
molecule
19.
What is the smallest unit of an element that retains the properties of that element?
a)
electron
b)
molecule
c)
neutron
d)
atom
20.
What happens to water molecules during the boiling process?
a)
They move faster and move farther apart as they absorb heat.
b)
They move faster and remain close together as they absorb heat.
c)
They move more slowly but move farther apart as they lose heat.
d)
They move faster and move farther apart as they lose heat.
21.
What chemical reaction results in the formation of a solid?
a)
acid base reaction
b)
endothermic
c)
precipitate
22.
When baking soda and vinegar react, the product includes bubbles. Whathas most likely occurred?
a)
gas formation
b)
exothermic reaction
c)
precipitate formation
23.
What is the best evidence for a chemical reaction?
a)
color change
b)
cutting a metal
c)
change of state
24.
Food spoiling is a chemical reaction. What is the best way to keep food fresh and edible?
a)
Leave the food on the counter at room temperature.
b)
Put the food in the refrigerator.
c)
Wrap food in aluminum foil.
25.
Which best demonstrates a physical change?
a)
change in temperature
b)
formation of a gas
c)
change in state
26.
Which best represents a physical change?
a)
bubbling
b)
condensation
c)
formation of a precipitate
d)
formation of a new substance
27.
Sam finds a block made from an unknown element. Which is the best way to determine which element was used to create the block?
a)
test the malleability of the block
b)
determine the mass of the block
c)
calculate the density of the block
d)
observe the reaction between the block and a nonmetal
28.
Which term describes the relationship between the mass and volume of a substance?
a)
density
b)
solubility
c)
specific heat
d)
melting point
29.
The amount of energy required to raise one gram of a substance 1°C can be used to identify unknown substances. Which term best describes this property?
a)
solubility
b)
specific heat
c)
melting point
d)
chemical reactivity
30.
What is needed to change ice into water?
a)
air
b)
energy
c)
stirring
d)
chemicals
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