MULTIPLE CHOICE QUESTIONS Flashcards
The rate at which a chemical reaction occurs may be increased by:
by grinding the solid reactant into fine powder.
A Catalyst:
increases the rate of reaction without being consumed, is not a reactant, and provides an easier path for the reaction to follow.
What type of reaction occurs between zinc metal and hydrochloric acid?
Single displacement
What type of reaction occurs between sodium and fluorine gas?
Synthesis
a pH of 1.5 would indicate that the substance being tested is:
Strongly acidic
WHich of the following has pure covalent bonding? CH4 or HBr or MgF2 or N2 or H2O
N2
What colour would phenolphtalein be if added to potassium hydroxide?
Pink
The reaction between an acid and a base produces…
water and salt
What is the formula for the compound sodium sulfate?
Na2SO4
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
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
The rx’n between potassium iodide and lead nitrate solutions would be an example of
a double displacement reaction
A property of a covalent compound is…
They have low melting point,
A metallic atom generally becomes positive by
losing electrons
What is an ion an ion that contains more than one atom called?
a polyatomic atom
What type of reaction is the burning of hydrocarbon in oxygen called?
a combustion reaction
what is the scale that describes the acidity of a solution as a number?
the pH scale
The starting materials in a chemical reaction are called
reactants
Bases produce _____ ions while acids produce _________ ions
positive, negative
What is a substance called that changes colours in acids or bases?
indicator
Covalent bonds with an unequal sharing of electrons are said to be…
polar covalent
state 2 common acids
lemon juice and apple juice
state 2 common bases
windex, drain cleaner
Which source produces light using ultraviolet rays?
fluoresence
WHat is the line called from which the angle of incidence is measured
normal
