Which of the following are chemical changes?

All of these are chemical changes.

Evidence of a chemical reaction.

precipitate forms, temperature increase, new substance forms

Properties of metalloids include...

malleable or brittle; and semi-conductors

What is the best description of a molecule of glucose?

6 atoms of carbon, 12 atoms of hydrogen, and 6 atoms of oxygen

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Checkpoint 1 Review

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Questions 16

Answers

1
Which of the following is classified as an element?
Iron (Fe)
Carbon Dioxide (CO2)
Water (H2O)
Vinegar (CH3COOH)
2
Which of the following is classified as a mixture?
Water
air
salt
Carbon Dioxide
3
Properties of Nonmetals include...
dull and malleable
semi-conductor
dull and brittle
lusterous and malleable
4
Which of the following are chemical changes?
A Chevy truck rusting.
Gasoline exploding in a running engine.
A Chemistry textbook burning.
All of these are chemical changes.
5
Properties of metals include.......
Shiny
All of these properties
High melting point
Thermal and electrical conductors
6
Which of the following is a metalloid? Select TWO correct answers.
Aluminum
Zinc
Antimony
Argon
Silicon
7
Evidence of a chemical reaction.
precipitate forms
temperature increase
new substance forms
substance evaporates
8
Dissolving sugar in water is an example of what type of change?
Physical change
Digestive change
Both physical and chemical change
Chemical change
9
Which of the following is a list of only elements?
Copper, aluminum, silver
Water, copper, aluminum
Silver, salt, copper
Water, salt, baking soda
10
Properties of metalloids include...
malleable and ductile
dull and brittle
malleable or brittle; and semi-conductors
conductors and lusterous
11
Which of the following is classified as a compound?
water (H2O)
helium (He)
Oxygen (O)
hydrogen (H)
12
Which element is most likely a solid with dull appearance and a poor conductor of electricity?
Niobium, Nb
Sulfur, S
Sodium, Na
Aluminum, Al
13
What is the best description of a molecule of glucose?
6 atoms of carbon, 12 atoms of hydrogen, and 6 atoms of oxygen
6 atoms of carbon, 12 elements of hydrogen, and 6 atoms of oxygen
1 atom of carbon, 1 atom of hydrogen, and 1 atom of oxygen
6 molecules of carbon, 12 molecules of hydrogen, and 6 molecules of oxygen
14
Located left on the periodic table
Metals
Jordan
Nonmetals
Metalloids
15
Which of the following is a physical change?
An explosion
Cutting
Production of bubbles
Temperature increase
16
Elements that have chemical and physical properities of both metals and nonmetals are _____.
rare earth metals
alkali earth metals
metalloids
transition metals

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