Same number of protons but different numbers of neutrons

An exothermic reaction is when more energy is ...

released when bonds are made than taken in to break bonds

What is the test for sulfate ions?

add dilute HCl + BaCl2 solution, white precipitate forms

In the reaction A + B --> C + D, if the concentration of A increases, the rate ....?

... increases as more particles = more frequent collisions

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GCSE Chemistry quiz 1

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#atomic structure #periodic table #bonding #mole calculations #reactivity series #rates of reaction #chromatography #AQA #chemistry #GCSE

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Questions 20

Answers

1
What is an isotope?
Same number of neutrons but different numbers of protons
Same number of electrons but different numbers of protons
Same number of neutrons but different numbers of electrons
Same number of protons but different numbers of neutrons
2
How many particles in a mole of a substance?
6.02 x 1023
2.06 x 10-23
6.02 x 10-23
2.06 x 1023
3
What is the gas test for oxygen?
Lights with a squeaky pop
glowing splint relights
Blue litmus paper turns white
Limewater turns cloudy
4
Define the mass of a compound ...
moles / Mr
Mr / moles
Weight x 9.8
Moles x Mr
5
An exothermic reaction is when more energy is ...
released when bonds are made than taken in to break bonds
absorbed when bonds are made than needed to break bonds
taken in to break bonds than is released when bonds are made
needed when bonds are made than released when bonds break
6
What is the test for sulfate ions?
add dilute H2SO4 + BaCl2 solution, yellow precipitate forms
add dilute HCl + BaCl2 solution, yellow precipitate forms
add dilute HCl + BaCl2 solution, white precipitate forms
add dilute H2SO4 + BaCl2 solution, white precipitate forms
7
In the reaction A + B --> C + D, if the concentration of A increases, the rate ....?
... increases (particles have more energy, more collisions)
... decreases as there is more volume so less collisions
... increases as more particles = more frequent collisions
... decreases as more particles = less surface area
8
What is the formula of potassium nitrate?
KNO3
KNO2
KNO
PNO2
9
Which positive ion turns a "dirty" green colour with NaOH?
Fe2+
Cu2+
Fe3+
Mg2+
10
What colour precipitate is formed with bromide ions and acidified silver nitrate?
white
yellow
brown
cream
11
In a flame test, what colour is potassium?
green
crimson
Lilac
yellow
12
What negative ion causes limewater to go milky?
bromide
sulfate
carbonate
chloride
13
When NaOH is added to a solution, which ion gives a red-brown precipitate?
Al3+
Cu2+
Fe2+
Fe3+
14
When magnesium metal is reacted with sulfuric acid, what products are made?
magnesium sulfide and water
magnesium sulfate and hydrogen
magnesium sulfate and oxygen
magnesium sulfate and water
15
Magnesium has atomic number 12, what is its electron configuration?
2,8
2,8,2
2,8,8,2
2,2,8
16
Which of the following is not a separation technique?
Filtration
Chromatography
Fermentation
Distillation
17
What element has the symbol W in the periodic table?
Tungsten
Water
Phosphorus
Potassium
18
What is the maximum number of electrons the first energy level can hold?
8
6
2
18
19
Which metal is the most reactive when added to water?
Ca
Na
K
Li
20
What type of bonding would lead iodide have?
simple covalent
metallic
ionic
giant covalent

GCSE Chemistry quiz 1 Flashcards | StudBud