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Chemistry For A Better Life - Revision Flashcards | StudBud
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Chemistry For A Better Life - Revision
Chemistry For A Better Life - Revision
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Revision for Year 10 Science exam
Flashcards
40 cards
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Practice quiz
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Host live
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Questions
40
Answers
1
What explains how chemical reactions occur and why the reaction rates differ?
Law of conservation of energy
The collision theory
Relativity theory
Law of conservation of mass
2
What law states the following: Mass is neither created or destroyed during chemical reactions
Law of energy
Law of conservation of energy
Law of mass
Law of conservation of mass
3
Reactions which produce heat are called...
exothermic
endothermic
4
True or False? All chemical reactions DO NOT involve a transfer of energy.
True
False
5
A base has a pH of?
>7
0
<7
7
6
Which is an example of a chemical name?
nitrogen gas
N2 + 3H2 > 2NH3
nitrogen gas + hydrogen gas > ammonia
N2
7
What are elements?
Molecules
The building blocks of MOST matter
The building blocks of ALL matter
The building blocks of cells
8
Which of the following is not an indicator of a chemical reaction?
change in colour
change in temperature
change in state
formation of solids
9
Name the products for the following precipitation reaction: sodium hydroxide + copper sulphate
sodium sulphate + copper hydroxide
sodium hydroxide + copper sulphate
sodium hydroxide + copper hydroxide
sodium sulphate + copper sulphate
10
True of false? All chemical reactions involve the breaking and reforming of bonds.
True
False
11
what are the products when an acid and a base are combined?
salt and water
salt and hydrogen
salt and carbon dioxide
a salt
12
validity is achieved by...
answering the aim
using the correct equipment
testing one variable
all of the above
13
What are the two products of electrolysis?
water
hydrogen gas and oxygen gas
some gases
hydrogen and oxygen solid
14
Reactions which absorb heat are called...
endothermic
exothermic
15
Which is an example of a chemical formula?
water
hydrogen + oxygen > water
2H2 + O2 > 2H20
H20
16
reliability is achieved by....
repeating the experiment
answering the aim
testing one variable
All of the above
17
How many types of atoms (smallest part of an element) are elements made of?
3
1
As many as needed
2
18
an acid has a pH of?
>7
<7
14
7
19
Which of the following is an example of a diatomic molecule?
hydrogen
gold
sodium
carbon
20
Which are CHEMICAL reactions?
burning paper, rusting, evaporation
cooking, respiration, melting ice
cooking, rusting, digestion
respiration, rusting, ripping paper
21
combining two solutions to form a solid is which type of reaction?
displacement reaction
chemical reaction
decomposition reaction
precipitation reaction
22
What rules can you use to determine which product is the precipitate?
chemistry rules
precipitation rules
solubility rules
product rules
23
What does a carbonate contain?
carbon
H
OH
CO3
24
Gold is an element made up of:
gold and oxygen atoms
gold molecules
gold and oxygen molecules
gold atoms
25
The controlled variables are what we...
report
control
measure
change
26
total mass of reactants = ?
total mass of products
more than the reactants
a reaction
less than the reactants
27
True or false? Catalysts are NOT used up in a reaction.
False
True
28
True of false? Reactants are on the right hand side of a chemical equation.
False
True
29
A neutral substance has a pH of?
>7
<7
7
14
30
which of the following is chemical equation?
H20
hydrogen + oxygen > water
H
2H2 + O2 > 2H20
31
What is the chemical symbol of Magnesium?
M
K
Mn
Mg
32
What does a base contain?
Oxygen (O)
hydroxide group (OH)
a base
Hydrogen (H)
33
How fast reactants change to products is called....
Rate of reaction
a chemical reaction
rate of products
rate of reactants
34
Define synthetic
a natural product
a natural product made by a physical change
imitation of a natural product made by a chemical reaction
imitation of a man-made product made by a chemical reaction
35
Compounds are made up of...
1 atom
1 element
2 of the same atom
2 or more different elements
36
The dependent variable is what we...
change
measure
control
report
37
What can we do to speed up a reaction?
add a catalyst
All of the above
increase concentration
increase temperature
38
H20 is an example of...
a molecule
an atom
an element
a mixture
39
Which of the following is an example of a decomposition reaction?
a nail rusting
combining an acid and a base
decomposition of sucrose
a solid forming when two solutions are combined
40
The independent variable is what we....
control
measure
change
report
