Unit 4 Test Review Question Preview (ID: 39402)


Unit 4. TEACHERS: click here for quick copy question ID numbers.

During a science class investigation, a teacher places a small amount of sugar in a spoon and heats it over a candle. Which of the following would be the best evidence that a change in chemical properties of sugar has taken place?
a) The sugar gets hotter.
b) The sugar gets larger.
c) The sugar turns into a liquid.
d) The sugar turns black.

What do the letters Na and Cl represent in the chemical formula NaCl?
a) Mixtures
b) Elements
c) Compounds
d) Molecules

Look at this chemical equation: 8CO+17H2.......Which substance in the above equation represents an element?
a) CO
b) H2
c) C8H18
d)

The chemical formula for glucose is C6H12O6, and the symbol for Hydrogen is H. Glucose is the product of photosynthesis and is a simple sugar. Based on this.....which statement is false?
a) There are 6 carbon atoms in glucose.
b) Calcium is found in glucose.
c) Glucose is a compound with multiple elements.
d) Hydrogen is an element that is found in glucose.

Which of the following is a compound?
a) Co
b) Fe
c) H
d) CO

Mixing flour, salt, and sugar
a) Chemical change
b) Physical change-You can still separate these out into flour, salt, and sugar.
c) No change
d)

Leaves changing color in the fall.
a) Chemical change
b) Physical change
c) No change
d)

Dry ice goes from the solid form to the gas form of CO2
a) Chemical change
b) Physical change-just changing the state of matter
c) No change
d)

Grinding something into powder
a) Chemical change
b) Physical change-Just changing the state
c) No change
d)

A silver spoon tarnishes
a) Physical change
b) Chemical change
c) An element
d) No change

Water spreading into hydrogen and oxygen.
a) Chemical change
b) Physical change
c) No change
d)

Sugar cube dissolving in water.
a) Physical change
b) Chemical change
c) No change
d)

Which of the following is only true about a compound (not both true about elements and compounds)?
a) Made from more than one element and formed through a chemical reaction.
b) Formed through a chemical reaction and found on the periodic table.
c) A pure substance and found on Earth.
d) Found on the periodic table and essential for life.

Which processes can be used as evidence to identify the formation of a new substance?
a) Salt dissolving in water, precipitate, temperature change, and adding food coloring to cake icing.
b) Precipitate, temperature change, gas is released to show bubbles, and chemicals in fireworks explode to show colors.
c) Precipitate, temperature change, adding food coloring to cake icing, and chemicals in fireworks explode to show colors.
d) Temperature change, adding food coloring to cake icing, gas is released as bubbles, and chemicals explode for fireworks.

Two substances mix together. Which of the following does not identify the formation of a new substance?
a) A gas is produced.
b) One liquid dissolves into the other.
c) The temperature changes.
d) A solid is formed.

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