Matter and pH

Question 1

In chemistry, pH stands for:

Accepted Answer

potential hydrogen

Question 2

Atoms have three main parts: protons, neutrons and:

Accepted Answer

electrons

Question 3

Why is pure water considered a neutral substance?

Accepted Answer

positive and negative ions balance each other out

Question 4

Water molecules have two hydrogen atoms and one:

Accepted Answer

oxygen atom

Question 5

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 6

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

Accepted Answer

values below 7 indicate more alkalinity

Question 7

Matter that is not alive, has never been alive and does not contain carbon, such as rocks, water and minerals :

Accepted Answer

inorganic chemistry

Question 8

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

Accepted Answer

water

Question 9

The simplest atomic structure is:

Accepted Answer

hydrogen

Question 10

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

Accepted Answer

iron changing to rust

Question 11

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

Accepted Answer

matter

Question 12

How many elements occur naturally?

Accepted Answer

92

Question 13

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

Accepted Answer

water-based

Question 14

Why is skin a solid?

Accepted Answer

has definite weight, volume and shape

Question 15

Acids tend to taste:

Accepted Answer

sour

Question 16

Alkalis tend to taste:

Accepted Answer

bitter

Question 17

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

Accepted Answer

neutral

Question 18

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

Accepted Answer

oxygen

Question 19

What is a negatively charged ion called?

Accepted Answer

anion

Question 20

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

Accepted Answer

oxygen and hydrogen combining to form water

Question 21

Define solid

Accepted Answer

matter with definite weight, volume and shape

Question 22

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

Accepted Answer

liquid

Question 23

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

Accepted Answer

elements

Question 24

Scientific study of matter and the physical and chemical changes of matter is :

Accepted Answer

chemistry

Question 25

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

Accepted Answer

gas

Matter and pH

Questions 25

Matter and pH

Questions 25