Elscores: Tuesday, 20 August 2024
Chemistry Cumulative REVIEW
Questions and Correct Answer
Determine density. Write the formula. What is the density of an object that has a mass 40.0g
and a volume of 8.0mL? Show your work.
✓ :-- D=m/v (mass/volume)
✓ 40/8= 5g/mL
What is the density of water? Would the object in #1 float or sink in water? Explain.
✓ :-- The density of water is 1g/mL
the object in #1 would sink because an object with a density less than 1 g/cm3 will float
What are two ways that mixtures are classified? Give an example of each.
✓ :-- heterogeneous: Oil & water
homogeneous : sugar water
What are two ways that substances are classified? Give an example of each.
✓ :-- Element: water
Compound: carbon dioxide
What distinguishes a substance from a mixture?
a. Substances are compounds, and mixtures are not.
b. Mixtures are groupings of elements, and compounds are not.
DO NOT COPY AND PASTE!!
, Elscores: Tuesday, 20 August 2024
c. Samples of the same substance can have different intensive properties.
d. Mixtures can be separated physically, while compounds cannot.
✓ :-- Mixtures can be separated physically, while compounds cannot.
Define physical property and give examples.
✓ :-- Can be observed without changing the material's composition.
Ex) color, shape, mass, lenth, odor, melting and boiling point, density, hardness, solubility,
luster,
Define chemical property and give examples.
✓ :-- can be oberved only by changing the material's composition.
Ex) Reactivity, Flambility, reacts with acid to form H2, combustion,neutralize
Define physical change and give examples.
✓ :-- the original substance still exists, it has only changed in form.
Ex) melting, evaporation, or boiling
Define chemical change and give examples.
✓ :-- a new substance is produced
Ex) energy (hear or light), gas/bubbles (boiling doesn't count), formation of precipate, color
change, irreversability
What evidence indicates that a chemical change has occurred?
DO NOT COPY AND PASTE!!
Chemistry Cumulative REVIEW
Questions and Correct Answer
Determine density. Write the formula. What is the density of an object that has a mass 40.0g
and a volume of 8.0mL? Show your work.
✓ :-- D=m/v (mass/volume)
✓ 40/8= 5g/mL
What is the density of water? Would the object in #1 float or sink in water? Explain.
✓ :-- The density of water is 1g/mL
the object in #1 would sink because an object with a density less than 1 g/cm3 will float
What are two ways that mixtures are classified? Give an example of each.
✓ :-- heterogeneous: Oil & water
homogeneous : sugar water
What are two ways that substances are classified? Give an example of each.
✓ :-- Element: water
Compound: carbon dioxide
What distinguishes a substance from a mixture?
a. Substances are compounds, and mixtures are not.
b. Mixtures are groupings of elements, and compounds are not.
DO NOT COPY AND PASTE!!
, Elscores: Tuesday, 20 August 2024
c. Samples of the same substance can have different intensive properties.
d. Mixtures can be separated physically, while compounds cannot.
✓ :-- Mixtures can be separated physically, while compounds cannot.
Define physical property and give examples.
✓ :-- Can be observed without changing the material's composition.
Ex) color, shape, mass, lenth, odor, melting and boiling point, density, hardness, solubility,
luster,
Define chemical property and give examples.
✓ :-- can be oberved only by changing the material's composition.
Ex) Reactivity, Flambility, reacts with acid to form H2, combustion,neutralize
Define physical change and give examples.
✓ :-- the original substance still exists, it has only changed in form.
Ex) melting, evaporation, or boiling
Define chemical change and give examples.
✓ :-- a new substance is produced
Ex) energy (hear or light), gas/bubbles (boiling doesn't count), formation of precipate, color
change, irreversability
What evidence indicates that a chemical change has occurred?
DO NOT COPY AND PASTE!!
