Which of the following is an example of a mixture? (1 point)

Question

Responses

Water
Water

Salt
Salt

Oxygen Gas
Oxygen Gas

Air
Air

Answer 1

The correct answer is Air. Air is a mixture of various gases, primarily nitrogen, oxygen, carbon dioxide, and other trace gases. The other options (water, salt, oxygen gas) are pure substances.

Answer 2

Particles in each state of matter behave differently because they have different amounts of thermal energy. For each statement below, select whether it is true or false. (1 point)
True False
Particles in a solid are packed tightly.

Particles in a solid have thermal energy.

Particles in a solid are completely still.

Answer 3

Here are the answers for each statement:

1. Particles in a solid are packed tightly. - True

2. Particles in a solid have thermal energy. - True

3. Particles in a solid are completely still. - False

So, the overall answers are:

• True
• True
• False

Answer 4

Determine whether each statement below is true or false to complete the table. (1 point)
True False
The nucleus of an atom is found in the atom's center.

The nucleus of an atom contains at least one proton.

A neutron has a positive electrical charge.

Most of an atoms mass is found in protons and neutrons.

Answer 5

Here are the answers for each statement:

1. The nucleus of an atom is found in the atom's center. - True

2. The nucleus of an atom contains at least one proton. - True (Note: Most elements have at least one proton in their nucleus)

3. A neutron has a positive electrical charge. - False (Neutrons are neutral and have no electrical charge)

4. Most of an atom's mass is found in protons and neutrons. - True

So, the overall answers are:

• True
• True
• False
• True

Answer 6

Which of the following statements best describes the periodic table?(1 point)
Responses

A chart that organizes elements based on their atomic number.
A chart that organizes elements based on their atomic number.

A chart that lists elements in alphabetical order.
A chart that lists elements in alphabetical order.

A chart that groups elements based on their melting points.
A chart that groups elements based on their melting points.

A chart that shows the number of electrons in each element.

Answer 7

The statement that best describes the periodic table is:

A chart that organizes elements based on their atomic number.

This statement accurately reflects how elements are arranged in the periodic table, primarily by their atomic number, which is the number of protons in the nucleus of an atom.

Answer 8

Which of the following is a physical property of matter?(1 point)
Responses

Ability to rust
Ability to rust

Ability to burn
Ability to burn

Ability to conduct electricity
Ability to conduct electricity

Ability to react with water
Ability to react with water

Answer 9

The correct answer is:

Ability to conduct electricity.

This is a physical property of matter. The other options (ability to rust, ability to burn, and ability to react with water) are chemical properties, as they describe a substance's potential to undergo chemical changes.

Answer 10

The chemical reaction that produces soap is called saponification. During one type of saponification, oil and sodium hydroxide undergo a chemical change to produce glycerol and soap. As a result of this reaction, the soap has different properties than the oil and sodium hydroxide. Some of these properties are what give soap its cleaning ability. For each statement below, choose whether it is true or false. (1 point)
True False
A chemical change occurs during saponification.

Soap is a reactant of the saponification reaction.

Together, the products of a chemical reaction have the same arrangement of atoms as the reactants.

Answer 11

Here are the answers for each statement:

1. A chemical change occurs during saponification. - True
   (Saponification is indeed a chemical reaction that transforms the reactants into different products.)

2. Soap is a reactant of the saponification reaction. - False
   (Soap is a product of the saponification reaction, not a reactant.)

3. Together, the products of a chemical reaction have the same arrangement of atoms as the reactants. - False
   (In a chemical reaction, the arrangement of atoms changes, resulting in different products.)

So, the overall answers are:

• True
• False
• False