Question

when there is all of same kind of substance (i.e. same characteristic properties and same composition), it is known as a...
element
compound
mixture
pure substance
question 9
1 pts
select is a state of matter where particles are moving quickly, are very spaced out, and take the shape and volume of their container (indefinite shape and volume).
question 10
1 pts
when substances react and a new substance is formed it is called a select change.
desk 1

Explanation:

First Question (Substance Classification)

A pure substance has uniform composition and characteristic properties. An element is a type of pure substance with unique atoms, a compound is a pure substance with multiple elements, and a mixture has variable composition. The description matches a pure substance.

Gases have particles that move rapidly, are far apart, and take the shape and volume of their container (indefinite shape/volume). Liquids have definite volume but indefinite shape, solids have definite shape/volume. So the state is gas (assuming options include gas; if the dropdown had gas, that's the answer).

A chemical change occurs when substances react to form a new substance (vs. physical change, which doesn't form new substances). So the change is chemical.

Answer:

D. pure substance

Question 9 (State of Matter)