Matter & PH

Question 1

What ingredient is listed as the primary ingredient on many skin care products?

Accepted Answer

water

Question 2

When a solution has an equal number of hydrogen and hydroxide ions, the solution is considered:

Accepted Answer

neutral

Question 3

What is a negatively charged ion called?

Accepted Answer

anion

Question 4

Alkalis tend to taste:

Accepted Answer

bitter

Question 5

Why is skin a solid?

Accepted Answer

has definite weight, volume and shape

Question 6

Atoms have three main parts: protons, neutrons and:

Accepted Answer

electrons

Question 7

Which of the following is NOT an example of a physical change?

Accepted Answer

iron changing to rust

Question 8

Which of the following conditions is an example of chemical change?

Accepted Answer

oxygen and hydrogen combining to form water

Question 9

How many elements occur naturally?

Accepted Answer

92

Question 10

Water molecules have two hydrogen atoms and one:

Accepted Answer

oxygen atom

Question 11

The simplest atomic structure is:

Accepted Answer

hydrogen

Question 12

What kind of substance does pH indicate the acidity or alkalinity of?

Accepted Answer

water-based

Question 13

The term used to identify anything that occupies space and has weight is called:

Accepted Answer

matter

Question 14

Matter with definite weight but indefinite volume and shape is called:

Accepted Answer

a gas

Question 15

Basic substances that cannot be broken down into simpler substances are called:

Accepted Answer

elements

Question 16

All matter that is not alive, has never been alive falls within the study of:

Accepted Answer

inorganic chemistry

Question 17

A solid is defined as:

Accepted Answer

matter with definite weight, volume and shape

Question 18

The scientific study of matter and the physical and chemical changes of matter is known as:

Accepted Answer

chemistry

Question 19

Skin comprises two solids, which are carbon and sulfur and three gases, which are hydrogen, nitrogen and:

Accepted Answer

oxygen

Question 20

All of the following statements regarding the pH scale are true EXCEPT:

Accepted Answer

values below 7 indicate more alkalinity

Question 21

Acids tend to taste:

Accepted Answer

sour

Question 22

Matter with definite weight and volume but no definite shape is called:

Accepted Answer

liquid

Question 23

In chemistry, pH stands for:

Accepted Answer

potential hydrogen

Question 24

All matter that is now living or was alive at one time, with carbon present, falls within the scientific division of:

Accepted Answer

organic chemistry

Question 25

Why is pure water considered a neutral substance?

Accepted Answer

positive and negative ions balance each other out

Matter & PH

Questions 25

Matter & PH

Questions 25