Question

This is the chemical formula for carbon dioxide. How many atoms are in carbon dioxide?

Question 2 options:

1


2


3


4

Answer 1

The chemical formula for carbon dioxide is CO2. This molecule consists of one carbon atom (C) and two oxygen atoms (O), making a total of 3 atoms in carbon dioxide.

Thus, the correct answer is 3.

Answer 2

You and your lab partner take two clear liquids and mix them together. When observing the final product, you notice a yellow solid has formed.

What is the term for the solid that is formed as the result of a chemical change?

Question 3 options:

condensate


evaporate


precipitate


subliminate

Answer 3

The term for the solid that is formed as the result of a chemical change is "precipitate."

Therefore, the correct answer is "precipitate."

Answer 4

Which of the following is possible evidence of a chemical change?

Question 4 options:

A liquid turns to a solid


A sample of metal melts


A substance bubbles and fizzles


A solid dissolves in a liquid

Answer 5

The possible evidence of a chemical change is when a substance bubbles and fizzles.

Option: "A substance bubbles and fizzles"

Answer 6

Which physical properties are used to classify elements as metals, nonmetals, and metalloids?

Question 5 options:

Color, smell, physical state


Reactivity, streak, hardness


Ability to burn, mass, density


Luster, conductivity, malleability

Answer 7

The physical properties used to classify elements as metals, nonmetals, and metalloids are luster, conductivity, and malleability.

Option: "Luster, conductivity, malleability"

Answer 8

iron (Fe) is classified as a metal while silicon (Si) is classified as a metalloid.

Which physical property do these two elements most likely have in common?

They both —

Question 6 options:

exist as gases at room temperature.


have a metallic shine or luster.


are brittle and shatter easily.


conduct electricity very well.

Answer 9

The physical property that iron (Fe) and silicon (Si) most likely have in common is that they both have a metallic shine or luster.

Option: "Have a metallic shine or luster."

Answer 10

To calculate the density of an object you must know its —

Question 7 options:

weight and conductivity.


mass and texture.


weight and volume.


mass and volume.

Question 8 (1 point)
Determine the density of a sample of an unknown substance with a mass of 30 grams and a volume of 10 cubic centimeters.

Remember, density = mass ÷ volume

Question 8 options:

3 grams/cubic centimeter


0.3 grams/cubic centimeter


300 grams/cubic centimeter


6 grams per cubic centimeter

Question 9 (1 point)
Use the Mohs Hardness Scale below:



Which mineral can scratch fluorite, but is scratched by orthoclase
feldspar?

Question 9 options:

Calcite


Talc


Apatite


Diamond

Question 10 (1 point)
A student was given two minerals of the same color. What physical property could be tested to help the student determine the identification of the two minerals?

Question 10 options:

Relative size


Mass in grams


Volume in milliliters


Streak color

Answer 11

To calculate the density of an object, you must know its mass and volume.

Option: "Mass and volume."


To determine the density of a sample of an unknown substance with a mass of 30 grams and a volume of 10 cubic centimeters, you would calculate the ratio of the mass to the volume. In this case, the density is 30 grams divided by 10 cubic centimeters, which equals 3 grams per cubic centimeter.

Option: "3 grams/cubic centimeter."


In the Mohs Hardness Scale, fluorite has a hardness of 4 and orthoclase feldspar has a hardness of 6. Therefore, the mineral that can scratch fluorite but is scratched by orthoclase feldspar is calcite, which has a hardness of 3 on the Mohs scale.

Option: "Calcite."


If a student is given two minerals of the same color, they could test the streak color to help determine the identification of the two minerals. Streak color refers to the color of the powder left behind when the mineral is scratched on a streak plate.

Option: "Streak color."