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Flashcards in MULTIPLE CHOICE QUESTIONS Deck (25)
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1

The rate at which a chemical reaction occurs may be increased by:

by grinding the solid reactant into fine powder.

2

A Catalyst:

increases the rate of reaction without being consumed, is not a reactant, and provides an easier path for the reaction to follow.

3

What type of reaction occurs between zinc metal and hydrochloric acid?

Single displacement

4

What type of reaction occurs between sodium and fluorine gas?

Synthesis

5

a pH of 1.5 would indicate that the substance being tested is:

Strongly acidic

6

WHich of the following has pure covalent bonding? CH4 or HBr or MgF2 or N2 or H2O

N2

7

What colour would phenolphtalein be if added to potassium hydroxide?

Pink

8

The reaction between an acid and a base produces...

water and salt

9

What is the formula for the compound sodium sulfate?

Na2SO4

10

Element X reacts with oxygen gas to form compound Y. Compound Y reacts with water to form a solution that turns red litmus blue. WHat is COmpound Y? A metal or a base or a non metal or a metal oxide or acidic oxide?

A metal oxide

11

Element x reacts with oxygen gas to form compound y. Compound y reacts with water to form a solution that turns bromothymol blue yellow. What is element x? a metal or non metal or metal oxide or acidic oxide or a base?

A non metal

12

The rx'n between potassium iodide and lead nitrate solutions would be an example of

a double displacement reaction

13

A property of a covalent compound is...

They have low melting point,

14

A metallic atom generally becomes positive by

losing electrons

15

What is an ion an ion that contains more than one atom called?

a polyatomic atom

16

What type of reaction is the burning of hydrocarbon in oxygen called?

a combustion reaction

17

what is the scale that describes the acidity of a solution as a number?

the pH scale

18

The starting materials in a chemical reaction are called

reactants

19

Bases produce _____ ions while acids produce _________ ions

positive, negative

20

What is a substance called that changes colours in acids or bases?

indicator

21

Covalent bonds with an unequal sharing of electrons are said to be...

polar covalent

22

state 2 common acids

lemon juice and apple juice

23

state 2 common bases

windex, drain cleaner

24

Which source produces light using ultraviolet rays?

fluoresence

25

WHat is the line called from which the angle of incidence is measured

normal