Elements are made of —
Question 1 options:
many types of atoms.
the same type of atom.
many different compounds.
the same type of compound.
21 answers
the same type of atom.
he image is from the Periodic Table of Elements.
What is the chemical symbol for Potassium?
Question 2 options:
19
39.0983
K
Potassium
What is the chemical symbol for Potassium?
Question 2 options:
19
39.0983
K
Potassium
K
The table has two columns of different kinds of matter.
Which of the following is the best label for the second column?
Question 3 options:
Atoms
Pure substances
Compounds
Mixtures
Which of the following is the best label for the second column?
Question 3 options:
Atoms
Pure substances
Compounds
Mixtures
Compounds
Above is the chemical formula for the compound sulfuric acid. How many different elements are in the compound?
(Remember that elements are pure substances found on the Periodic Table of Elements).
Question 4 options:
3
5
6
7
(Remember that elements are pure substances found on the Periodic Table of Elements).
Question 4 options:
3
5
6
7
3
which element is one of the most abundant in both solid parts of Earth and in living matter?
Question 5 options:
Oxygen
Phosphorus
Nitrogen
Carbon
Question 5 options:
Oxygen
Phosphorus
Nitrogen
Carbon
Oxygen
Which of the following characteristics is shared by all chemical changes?
Question 1 options:
They produce a precipitate.
They show a color change.
They release heat energy.
They form new substances.
Question 1 options:
They produce a precipitate.
They show a color change.
They release heat energy.
They form new substances.
They form new substances.
A student mixes two clear liquids together. After a few minutes, a white powder can be seen settling on the bottom of the test tube. Which of the following is a conclusion that the student can draw based on these observations?
The two clear liquids –
Question 2 options:
have combined to create a new substance.
form a solution.
are toxic and should be handled with caution.
have been stored too long and are no longer good.
The two clear liquids –
Question 2 options:
have combined to create a new substance.
form a solution.
are toxic and should be handled with caution.
have been stored too long and are no longer good.
The two clear liquids have combined to create a new substance.
Burning a candle is a chemical change. What is the primary evidence that burning the candle is a chemical reaction?
Question 3 options:
change in odor
change in color
formation of a solid
temperature change
Question 3 options:
change in odor
change in color
formation of a solid
temperature change
temperature change
A student added white crystals to a clear liquid. The crystals dissolved in the liquid. After a few seconds, the liquid became warm and then turned bright red in color.
What was the first indication that a chemical change was taking place?
Question 4 options:
The crystals were added to the liquid.
The crystals dissolved in the liquid.
The temperature of the liquid increased.
The liquid turned bright red.
What was the first indication that a chemical change was taking place?
Question 4 options:
The crystals were added to the liquid.
The crystals dissolved in the liquid.
The temperature of the liquid increased.
The liquid turned bright red.
The temperature of the liquid increased.
Which of the following is an example of a chemical change?
Question 5 options:
Salt is dissolved into water.
A child colors a picture with a crayon.
Solid iron is heated until it turns into a liquid.
A metal is added to an acid and hydrogen gas is formed.
Question 5 options:
Salt is dissolved into water.
A child colors a picture with a crayon.
Solid iron is heated until it turns into a liquid.
A metal is added to an acid and hydrogen gas is formed.
A metal is added to an acid and hydrogen gas is formed.
Both __________ and __________ can be classified as pure substances because they have distinct properties and composition
Question 1 options:
formulas, structure
elements, compounds
electrons, protons
atoms,
Question 1 options:
formulas, structure
elements, compounds
electrons, protons
atoms,
elements, compounds
1 answer