Question

1. What does a chemical change always result in?

New reactant
Increase activation energy
New substance
Precipitation
2. Which of the following causes the temperature of the surroundings to increase
Endothermic reaction
Exothermic reaction
Both endothermic and exothermic reactions
Neither endothermic nor exothermic reactions
3. A base is a substance that can _ _ _ _ _ a hydroxide ion
Accept
Bond with
Donate
4. Which substance resist pH changes
Buffers
Hydrogen ions
Acids
Bases
4. Which statement best describes an antacid
An antacid increases the amount of hydrogen ions
An antacid decreases the level of hydrogen ions
An antacid neutralizes excess hydrogen ions
5. Which of the following could be used to buffer vinegar
Baking soda
Sugar
Flour
Salt
6. Which of the powerline is strong base
NaCI
NaOH
HCI
HF
7. Which type of reaction happens when A base is mixed with an acid
Metal-base reaction
Neutralization reaction
Combustion reaction
Spontaneous reaction
8. As pH increases what happens to hydrogen ion concentration
It increases
It equals the pH number
It decreases
9. What does a pH of seven indicate about a substance
It is reactive
It is neutral
It is acidic
It is basic

Answer 1

1)New substance

2)Exothermic reaction(reaction which releases heat or light to the environment)

3)donate

4)buffers

5)salt(base)

6)NAOH

7)neutralisation reaction

8)It decreases

9)It is neutral