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WorksheetsMixtures and Law of Conservation of Mass
Total questions: 40
Worksheet time: 41mins
Name
Class
Date
1.
What is the difference between a mixture and a compound?
a)
compounds are easily taken apart
b)
mixtures are easily taken apart
c)
mixtures are chemically combined
d)
there is no difference
2.
How many different elements are represented in the compound Na2CO3?
a)
1
b)
2
c)
3
d)
4
3.
Italian salad dressing is a
a)
heterogeneous mixture
b)
homogeneous mixture
c)
pure Substance
d)
compound
4.
What is Kool-aid? A(n)
a)
element
b)
heterogeneous Mixture
c)
homogeneous Mixture
d)
compound
5.
Milk is a
a)
Heterogeneous mixture
b)
Homogeneous mixture
c)
Element
d)
Compound
6.
A heterogeneous mixture in which some of the particles settle out of the mixture upon standing is called a
a)
solution
b)
colloid
c)
solvent
d)
suspension
7.
The substance that dissolves is called the
a)
solvent
b)
solution
c)
solute
d)
unsaturated
8.
The substance that dissolves the solute is called the
a)
solution
b)
solvent
c)
saturation
d)
solute
9.
A mixture of two or more substances; very small dissolved particles are spread evenly throughout the mixture
a)
solvent
b)
solute
c)
suspension
d)
solution
10.
This/these type(s) of mixture(s) will block or scatter light (show the Tyndall effect)
a)
Suspension only
b)
Suspension or colloid
c)
Colloid only
d)
Solution and colloid
11.
Order the mixtures from SMALLEST to LARGEST particles:
a)
Solution, Colloid, Suspension
b)
Suspension, Solution, Colloid
c)
Solution, Suspension, Colloid
d)
Suspension, Colloid, Solution
12.
Which type of mixture has the smallest sized particles?
a)
solution
b)
colloid
c)
suspension
d)
element
13.
Which type of mixture contains the largest particles?
a)
suspension
b)
colliod
c)
solution
d)
compound
14.
Water and Kool-Aid are mixed together. Hot water, coffee and sugar are mixed together. Which substance is the solvent in both?
a)
Water
b)
Coffee
c)
Kool-aid
d)
Sugar
15.
This appears on the left side of a chemical formula, and represents how many molecules there are.
a)
An Atom
b)
The Subscript
c)
A Molecule
d)
The Coefficient
16.
How many hydrogen atoms are in this chemical formula: 2H2O?
a)
4 hydrogen atoms
b)
1 hydrogen atom
c)
2 hydrogen atoms
d)
3 hydrogen atoms
17.
How many oxygen atoms are in this chemical formula: H3PO4?
a)
7 oxygen atoms
b)
4 oxygen atoms
c)
3 oxygen atoms
d)
1 oxygen atoms
18.
How many Magnesium atoms are in 3MgCl2?
a)
3
b)
5
c)
1
d)
6
19.
Is this balanced?
2HgO → 2Hg + O2
2HgO → 2Hg + O2
a)
Yes
b)
No
c)
Not enough information
20.
Is this balanced?
Al + O2 → 2Al2O3
Al + O2 → 2Al2O3
a)
Yes
b)
No
c)
Not enough information
21.
The law of conservation of mass states that
a)
matter is created
b)
matter is destroyed
c)
matter is neither created nor destroyed
d)
matter does not change
22.
True or false: The law of conservation of mass means that the number of atoms of the products is more than the number of atoms in the reactants.
a)
True
b)
False
23.
Is this equation balanced?
a)
Yes
b)
No
c)
Not enough information
24.
Is this equation balanced?
a)
Yes
b)
No
c)
Not enough information
25.
What is the law of conservation of mass?
a)
Matter changes when reacted or changed.
b)
The mass of all reactants are changed during a physical or chemical change
c)
The mass of the reactants is the same as the mass of the products
d)
The mass of the products is different than the mass of the reactants.
26.
The total amount of matter (atoms) before and after a chemical reaction remains the same.
a)
True
b)
False
27.
What will weigh more when a chemical change is complete: the reactants before the chemical reaction or the product after the reaction is complete?
a)
They both will weigh the same
b)
The product always weighs more than the reactant
c)
The reactant will weigh more than the product
d)
They both will loose mass after the reaction
28.
Suppose a reaction were to happen in an open container in a lab. During the reaction, the scientist observes the chemicals bubble and produce a gas. During the analysis the scientist notices that the reactants weighed 20 g when he started, and the product weighed 18 g. Explain what happened.
a)
His chemical reaction defied the law of conservation of mass
b)
The product destroyed mass during the reaction
c)
The reactants created matter during the reaction
d)
The gas that was produced was not able to be weighed since the container was open.
29.
The building block of all matter is the
a)
Mixture
b)
Atom
c)
Element
d)
Substance
30.
This is made up of one or more of the SAME kind of atom:
a)
Element
b)
Mixture
c)
Compound
d)
Matter
31.
Water is an element.
a)
true
b)
false
32.
DIFFERENT kinds of atoms chemically combined to form a substance called a(n)
a)
Mixture
b)
Element
c)
Compound
d)
Substance
33.
Copper is a mixture.
a)
True
b)
False
34.
Pure water (H2O) is
a)
a pure substance
b)
a mixture
c)
an element
d)
a heterogeneeous mixture
35.
An example of a compound would be
a)
hydrogen gas (H2)
b)
heterogeneous
c)
sodium chloride (NaCl)
d)
oxygen gas (O2)
36.
The height of bean plants depends on the amount of water they receive.
What is the dependent variable?
What is the dependent variable?
a)
height of plants
b)
amount of water
c)
amount of sunlight
d)
type of plant
37.
The height of bean plants depends on the amount of water they receive.
What is the independent variable?
What is the independent variable?
a)
height of plants
b)
amount of water
c)
amount of sunlight
d)
type of plant
38.
A group of college students were given a short course in speed-reading. The instructor was curious if a monetary incentive would influence performance on a reading test taken at the end of the course. Half the students were offered $5 for obtaining a certain level of performance on the test, the other half were not offered money. What is the independent variable?
a)
$5
b)
level of performance on speed reading
c)
Being payed or not being payed
d)
speed reading
39.
Mr. McNiece wanted to see how different types of music affected students' pulse rates. He played different types of music: heavy metal, rap, R&B, alternative, pop, country, and classical music. Identify the dependent variable.
a)
type of music
b)
MP3 player
c)
heavy metal
d)
pulse rate
40.
Mr. McNiece wanted to see how different types of music affected students' pulse rates. He played different types of music: heavy metal, rap, R&B, alternative, pop, country, and classical music. Identify the independent variable.
a)
type of music
b)
MP3 player
c)
heavy metal
d)
pulse rate
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