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WorksheetsAdv. Unit 3 Review: Changes in Matter
Total questions: 30
Worksheet time: 21mins
What is K2SO4 composed of?
2 Potassium atoms, 4 Sulfur atoms, 4 Oxygen atoms
1 Potassium atom, 2 Sulfur atoms, 4 Oxygen atoms
2 Potassium atoms, 1 Sulfur atom, 4 Oxygen atoms
There is not enough information
Water is composed of what two elements combined?
Liquid and Gas
Nitrogen and Oxygen
Hydrogen and Oxygen
Water is an element.
Identify the compound's bond as either ionic or covalent: CO2
ionic
covalent
Identify the compound's bond as either ionic or covalent: MgO
ionic
covalent
Identify the compound's bond as either ionic or covalent: LiF
ionic
covalent
One type of cold remedy is an effervescent tablet that breaks down in water. When the tablet is placed in water, it forms gas bubbles. In this example, the formation of a gas is an example of what kind of change?
Physical change
Chemical change
Nuclear change
Phase change
Some power plants produce energy by burning coal. In these power plants, the heat from burning coal is used to boil water. Identify the changes that occur when burning coal and boiling water?
Burning coal = Physical change;
Boiling water = Physical change
Burning coal = Chemical change;
Boiling water = Physical change
Burning coal = Physical change;
Boiling water = Chemical change
Burning coal = Chemical change;
Boiling water = Chemical change
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
A scientist studying sodium chloride (NaCl) makes a list of its properties. Which observations are physical properties?
- White to colorless crystals
- Reacts with silver nitrate to form a solid
- Density = 2.47 g/cm3
- Dissolves in water
Only observation 3
Observations 1 and 2
Observations 1, 3, and 4
Observations 3 and 4
A student finds a bottle that is labeled with a long chemical name. What is the best way for the student to learn more about the chemical properties of this substance?
Research the information in a science book or computer.
Experiment with the chemical.
Ask a nearby student if they know about the chemical.
Use tools to take measurements of the chemical.
Takisha conducted an experiment to determine the effect of salt on the boiling point of water. She measured the boiling points of 100 mL of water with salt added in 5 g increments. As a control, she also recorded the temperature of water with no salt added. What is the purpose of this control?
The control should not change so it will not affect the experiment.
The control changes as a result of what is being manipulated.
The control is used as a comparison.
The control has no purpose in an experiment.
When a formula unit of magnesium sulfide, MgS, is separated into magnesium and sulfur particles, the particles are called
molecules.
ions.
isotopes.
compounds.
The formation of an ionic bond involves
a sharing of electrons.
a transfer of electrons.
a change in atomic mass.
a change in atomic number.
Examine the following chemical equation:
Mg + S → MgS
This equation expresses which change?
Two atoms combine to form one atom.
Two atoms combine to form one molecule.
Two elements combine to form a different element.
Two elements combine to form two new elements.
Students performed an investigation to test the heat retention properties of identically sized glass and aluminum containers. They put 100 mL of hot water into each container and measured the temperature change each minute for 15 minutes.
What is the independent (manipulated) variable in this investigation?
The change in temperature
The volume of container used
The type of container used
Heat retention properties
The formation of covalent bonds involves the
sharing of electrons.
transfer of electrons.
sharing of protons.
transfer of protons.
Identify the bonds for the following compound as either ionic or covalent: CaCl2
ionic
covalent
Identify the bonds for the following compound as either ionic or covalent: H2O
ionic
covalent
Identify the bonds for the following compound as either ionic or covalent: NaCl
ionic
covalent
An aluminum ion has a charge of +3, and an oxide ion has a charge of –2. Which would be the product of a reaction between these two elements?
Al3O2
Al2O
Al2O3
AlO3
Students conducted an investigation to determine if unknown liquids were acids or bases. What was the independent variable in this investigation
Acids
Bases
Unknown liquids
Reactions of the liquids
While Marsha was exploring caves in Florida, she saw rock formations called stalactites. Which is responsible for the formation of the stalactites inside a limestone cave?
Earthquake uplift
Drought conditions
Underground rivers
Dissolving chemicals
Balance the following equation:
__CO + __NO --> __N2 + __CO2
CO + NO --> N + CO2
CO + N2O --> N2 + CO2
2CO + 2NO --> N2 + 2CO2
It is already balanced.
Why is water known as the universal solvent?
Water dissolves all known substances in the universe.
Water is dissolved by all known substances in the universe.
Water is essential for life.
Water dissolves the greatest known number of substances.
Noble gases would be considered which of the following?
elements
compounds
mixtures
molecules
What is the the freezing point of water with the correct SI unit?
32o F
0o F
32o C
0o C
Which equation shows that the total mass during a chemical reaction stays the same?
2Na + 2H2O --> NaOH + H2
H2 + O2 --> H2O
Mg + Cl2 --> MgCl2
NaOH + MgCl2 --> NaCl + MgOH
Which of the following shows an exothermic reaction?
2H2 + O2 → 2H2O
2H2O + energy→ 2H2 + O2
6CO2 + 6H2O + energy→C6H12O6 + 6O2
2Na + Cl2 →2NaCl + energy
In every chemical change, ___.
the mass changes
the substances stay the same
the density stays the same
the substances change
Which property of water allows water molecules to be attracted to other water molecules?
adhesion
cohesion
solubility
freezing point of zero degrees Celsius
