Chemistry Part 1: Recap: Acids, Alkalis/Bases, pH, endothermic reactions

Question 1

A reactant is what you use at the start of a chemical reaction and undergoes a chemical change

Answer

true

Question 2

Complete this sentence: A chemical reaction is a process where

Accepted Answer

atoms and molecules change structure to form new substances

Answer

atoms and molecules die out and dissolve

Answer

only atoms rearrange themselves to form new substances

Question 3

Chemistry, Physics and Biology are...

Accepted Answer

natural sciences

Answer

mad

Answer

dangerous

Answer

social sciences

Answer

the only kind of sciences

Question 4

We use the pH scale and indicators to measure if a substance is  an acid, alkali/base or neutral

Answer

true

Question 5

Complete this sentence: We use the pH scale and indicators to

Accepted Answer

measure if a substance is an acid, alkali/base or neutral

Answer

check if a substance is edible and drinkable

Answer

have fun

Question 6

We use indicators to find out if a substance is an acid, an alkali/base or neutral

Answer

true

Question 7

We use indicators to find out if a substance is

Accepted Answer

an acid, an alkali/base or neutral

Answer

an acid

Answer

safe to drink

Question 8

What indicators have used?

Accepted Answer

Litmus paper strips (seniors) and red cabbage water (juniors)

Answer

Litmus paper strips and red cauliflower water

Answer

Litmus paper strips and broccoli water

Question 9

What does 'pH' stand for?

Accepted Answer

power/potential of Hydrogen

Answer

power to high people

Answer

power to hydrogen

Question 10

pH measures the concentration of hydrogen ions in a solution

Answer

true

Question 11

The pH scale ranges from 0 to 13

Answer

true

Question 12

The pH scale ranges from...

Accepted Answer

0 to 14

Answer

0 to 13

Answer

0 to infnity

Question 13

purified water a room temperature has a pH of_______

Accepted Answer

7

Answer

6

Answer

11

Question 14

a substance with a pH of 3 is_____________ than a substance with a pH of 6

Accepted Answer

more acidic

Answer

less acidic

Answer

more dangerous

Question 15

a substance with a pH of 8 is _________________  than a substance with a pH of 13

Accepted Answer

less alkaline/basic

Answer

more alkaline/basic

Question 16

pH 5 describes _____________

Accepted Answer

a weak acid

Answer

a strong acid

Answer

an alkali

Question 17

Is there a difference between an alkali and a base?

Accepted Answer

yes, an alkali is soluble in water while a base is not

Answer

no difference

Answer

yes, a base is soluble in water while an alkali is not

Question 18

what does an endothermic reaction involve?

Accepted Answer

a chemical process that sucks in heat from its surroundings, making the reaction mixture colder.

Answer

a chemical process that unleashes heat in its surroundings, making the reaction mixture warmer.

Question 19

How do you know if you have worked on an endothermic reaction?

Accepted Answer

The reaction mixture will get colder

Answer

The reaction mixture will get warmer

Question 20

What does 'Endothermic' mean?

Accepted Answer

It's ancient Greek for: endo: in/indoors, thermos: heat

Answer

It's ancient Greek for: endo: end, thermos: flask

Answer

It's ancient Latin for: endo: in/indoors, thermos: heat

Chemistry Part 1: Recap: Acids, Alkalis/Bases, pH, endothermic reactions

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