The correct answer is b. A pure substance can be an element.

Here's why:

a. It is always a solid or gas - This is not true. A pure substance can be in any state of matter: solid, liquid, or gas. It depends on the temperature and pressure.

b. It can be an element - This is true. A pure substance can be an element. An element is a substance that cannot be broken down into simpler substances by chemical means. Examples of elements include iron, copper, hydrogen and oxygen.

c. It does not have a fixed boiling point - This is not true. A pure substance has a fixed boiling point. For example, the boiling point of pure water is always 100 degrees Celsius at standard pressure.

d. It is also called "homogeneous mixture" - This is not true. A pure substance is not a mixture. A mixture contains two or more different substances that are physically combined, not chemically. A homogeneous mixture is a type of mixture in which the components mixed are uniformly distributed throughout the mixture. Examples of homogeneous mixtures are air and salt water.

Question

The correct answer is b. A pure substance can be an element.

Here's why:

a. It is always a solid or gas - This is not true. A pure substance can be in any state of matter: solid, liquid, or gas. It depends on the temperature and pressure.

b. It can be an element - This is true. A pure substance can be an element. An element is a substance that cannot be broken down into simpler substances by chemical means. Examples of elements include iron, copper, hydrogen and oxygen.

c. It does not have a fixed boiling point - This is not true. A pure substance has a fixed boiling point. For example, the boiling point of pure water is always 100 degrees Celsius at standard pressure.

d. It is also called "homogeneous mixture" - This is not true. A pure substance is not a mixture. A mixture contains two or more different substances that are physically combined, not chemically. A homogeneous mixture is a type of mixture in which the components mixed are uniformly distributed throughout the mixture. Examples of homogeneous mixtures are air and salt water.

Knowee AI · Accepted Answer

The correct answer is b. A pure substance can be an element.

Here's why:

a. It is always a solid or gas - This is not true. A pure substance can be in any state of matter: solid, liquid, or gas. It depends on the temperature and pressure.

b. It can be an element - This is true. A pure substance can be an element. An element is a substance that cannot be broken down into simpler substances by chemical means. Examples of elements include iron, copper, hydrogen and oxygen.

c. It does not have a fixed boiling point - This is not true. A pure substance has a fixed boiling point. For example, the boiling point of pure water is always 100 degrees Celsius at standard pressure.

d. It is also called "homogeneous mixture" - This is not true. A pure substance is not a mixture. A mixture contains two or more different substances that are physically combined, not chemically. A homogeneous mixture is a type of mixture in which the components mixed are uniformly distributed throughout the mixture. Examples of homogeneous mixtures are air and salt water.

Which of the following is TRUE about a pure substance?a.It is always a solid or gas.b.It can be an element.c.It does not have a fixed boiling point.d.It is also called "homogeneous mixture".

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