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WorksheetsChemistry (8.P.1.3/8.P.1.4) Test Review
Total questions: 60
Worksheet time: 32mins
Which of the following is an example of a physical property?
flammability of a piece of paper
toxicity of a solution
burning of a candle
color of a car
Which is an example of a chemical change?
boiling water
ice melting
iron rusting
freezing water
Which shows one example of a physical change and one example of a chemical change?
boiling water and melting wax
rusting iron and baking a cake
dissolving powder and shredding paper
freezing water and burning coal
Students performed an investigation on how aluminum cans taken to a recycle center were able to be reused. When the aluminum can is crushed, it undergoes which type of change?
a physical change because the can is heated
a chemical change because new metal is formed
a physical change because the material remains the same
a chemical change because the old aluminum can is changed into a new aluminum
can
The Law of Conservation of Mass says that matter can neither be __________ or __________.
created; destroyed
recycled; renewed
subtracted; added
joined; separated
Which shows one example of a physical change and one example of a chemical change?
boiling water and melting wax
rusting iron and baking a cake
dissolving powder and shredding paper
freezing water and burning coal
According to the Law of Conservation of Mass, what happens to the wood and oxygen when it is burned?
The wood disappears.
It stays the same chemically.
The atoms in the wood and oxygen rearrange and form smoke and ash.
Nothing.
How many atoms of Carbon (C) are in C6H12O6?
3
6
12
24
How many atoms of Iron are in this compound?
1
2
3
4
How many different elements are present in H2COCH2
5
4
3
2
Calculate the number of Oxygen atoms in Al(OH)3
1
2
3
4
How many total POTASSIUM atoms are in this formula?
8
2
4
12
Coefficients in chemical formulas...
Multiply just the first atom
Add to the subscripts at the end of the molecule
Multiply elements without subscripts
Multiply EVERYTHING!
Sodium sulfate and barium chloride react with each other to form sodium chloride and barium sulfate as shown.
Which statement MOST accurately describes the mass of the reactants compared to the mass of the products?
The reactants have a greater mass because some of the mass was converted to heat.
The reactants have a greater mass because some matter was destroyed by the reaction.
The mass of the reactants is the same as the mass of the products.
The products have a greater mass because matter was created during the reaction.
Which of the following is a correctly written chemical equation that demonstrates the conservation of mass?
A
B
C
D
Which set of coefficients will balance this chemical equation?
1,2
1,3
2,2
2,3
How does the concept of conservation of mass apply to chemical reactions?
The reactants and products have exactly the same atoms.
The reactants and products have exactly the same molecules.
The change in the amount of matter is equal to the change in energy.
The change in the amount of matter is only a small percentage of the total mass.
Which set of coefficients will balance this chemical equation?
1,2
1,3
2,3
2,5
A chemical reaction separates water into hydrogen gas and oxygen gas. Which of the following statements is true about the mass of the water and the combined mass of the two gases?
The mass of the water is greater than the combined mass of the two gases.
The combined mass of the two gases is much greater than the mass of the water.
The combined mass of the two gases is the same as the mass of the water.
The mass of the water is the same as double the combined mass of the two gases.
If 100 grams of vinegar and 5 grams of baking soda are poured in a container, a small amount of gas will be produced. What will the final mass of the products be if the gas is trapped in the container?
100g
104g
105g
110g
Which best explains why the total mass of the product(s) would be less than the total weight of the reactant(s) after a chemical reaction?
A physical change occurred
Atoms involved in the reaction lost mass.
Precipitates were created in the new solution.
Gases were released to the atmosphere.
Which of the following is an example of a pure substance?
Nickel
air
peanuts
blood
Sea water is an example of ______.
an element
a compound
a homogeneous mixture
a heterogeneous mixture
A _________ is made of two or more substances that are together in the same place but their atoms are NOT chemically bonded.
compound
mixture
substance
filtration
Which of the following is an example of a PURE SUBSTANCE?
A only
A and B
C and D
A, B and C
Which is an example of a chemical reaction?
Water evaporates into air
Vinegar added to baking soda forms a gas
Sugar dissolves in water
Corn kernels are crushed to form flour
As part of a study, a scientist observed a number of different molecular changes in matter. Which of the following observations provides evidence of a physical change?
using heat to burn a log in a fireplace
using light to produce sugar in plants
a cake that was baked from many ingredients
a bottle that was broken into many small pieces
In physical changes, substances might change in ________ but not in _______
appearance, composition
volume, state of matter
texture, color
weight, mass
Which of the following WILL NOT increase the speed of a reaction?
Increasing temperature
Increasing surface area
increasing the volume of a container
Adding a catalyst
Fe + O2 -> Fe2O3
Which is the BEST explanation of why heat is released when wood burns?
Burning creates energy by stopping particle motion
Burning destroys matter and creates energy with it.
Burning releases energy stored in chemical bonds.
Burning causes convection currents which create heat energy.
In a chemical formula, what information does the coefficient give you?
number of molecules present of the compound
how the compound is physically arranged
how the compound reacts with other compounds
how many atoms of each element in the compound
What is needed to change ice into water?
Air
Energy
Stirring
Chemicals
What is the common name for NaCl?
Table Salt
Soap
Vinegar
Baking Soda
Which BEST explains why the total mass of the product(s) would be less than the total mass of the reactant(s)?
a physical change occured
atoms involved in the reaction are destroyed
precipitate was created in the new solution
gases were released
The diagram is Carbon Tetrachloride (CCl4). Which letter represent chlorine?
A
B
The table provides some information about some group 1 elements. Which is the best estimate of the melting point of Rubidium (Rb)?
25
40
75
184
Read the following reaction: 2 Ca + O2 ← 2 CaO Which of the following represents the product of the reaction?
2Ca + O2
2CaO
2Ca
O2
Read the following reaction: 2 Ca + O2 ← 2 CaO Which of the following represents the reactant(s) of the reaction?
2Ca + O2
2CaO
2Ca
O2
Which statement best describes the change to an ice cube as it melts?
The change is physical because the mass remains the same.
The change is physical because the substance remains the same.
The change is chemical because water has a different pH than ice.
The change is chemical because ice has a lower density than water.
Which element has similar chemical properties to Nitrogen?
Phosphorus
Sulfur
Carbon
Neon
Which of the following elements would most likely bond with Argon (Ar)?
None because they are nonreactive
Boron (B)
Carbon (C)
Hydrogen (H)
Find an element with similar chemical properties to Barium (Ba)?
Ca and Ra, because they are in the same group and have similar chemical properties.
Cs and La, because they are in the same period.
Ca and Y, because they are at a 90 degree angle and have similar properties.
What element on the periodic table will most likely bond with Lithium (Li)?
Helium (He)
Hydrogen (H)
Chlorine (Cl)
Phosphorus (P)
Which of the following is a chemical property?
Texture
Volume
Combustion
Magnetism
Which of the following represents a physical property?
Reactivity
Solubility
Oxidation
Flammability
Which of the following describes a solid produced when two liquids react during a chemical reaction?
Precipitate
Reactant
Solute
Acid
Which best explains why conservation of mass should be studied in a closed system?
To prevent the loss of any reactants or products.
To prevent contamination of the products.
To prevent release of precipitates formed
To prevent the absorption of heat from the outside
Which of the following statements is true?
All chemical reactions are dangerous.
All chemical reactions require energy.
All chemical reactions can be reversed.
All chemical reactions only occur in the laboratory.
How many protons are in Sodium?
11
22
12
33
How many electrons are in Aluminium?
40
27
13
14
How many neutrons are in Magnesium?
36
12
24
6
How many neutrons are in Phosphorus?
16
15
31
46
How many electrons are in Sulfur?
32
16
48
8
How many neutrons are in Argon?
18
40
58
22
How many electrons are in Potassium?
19
20
58
39
