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9.9 Reactivity series
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True & false The anomalous value shows us that our values are precise.
false
4) After reacting hydrochloric acid with sodium hydroxide, the temperature has increased from 21ËšC to 52ËšC. This reaction is:
Exothermic
3) A grade 7 student wants to know if the reaction of hydrochloric acid and sodium hydroxide solution is exothermic or endothermic. He did an experiment for this reaction. Give the name of this reaction:
Neutralization
A) Why is an endothermic reaction useful in a cold pack? Explain how it helps when someone has an injury.
- When ammonium nitrate dissolves, it absorbs heat energy from its surroundings, making the cold pack cool. - This cooling helps reduce pain and swelling by ta
Iron filings burn in air to make ………………
Iron oxide
……………………….. process releases heat energy to the surroundings
Freezing
True & false The flare includes strontium nitrate, which makes a red flame.
True
True & false Dissolving potassium nitrate is exothermic process
True
True & false The Rio Tinto River is red because iron compounds are dissolved in it.
True
Endothermic changes transfer energy from the surroundings
True
………From the poisonous metals that dissolved in Rio Tinto River
 
Cadmium
 
Zinc
 
Strontium
 
Uranium
Iron reacts with water and oxygen to form Rust which is
 
Hydrated iron oxide
 
Rust oxide
 
Iron sulfate
 
Iron oxide
……………….. doesn’t react with Acid.
 
Copper
 
Sodium
 
Iron
 
Potassium
The pH of the Rio Tinto River in spin is ….
 
2
 
7
 
13
 
6
Which gas is always produced when a metal reacts with water?
 
Hydrogen
 
Carbon Monoxide
 
Carbon Dioxide
 
Oxygen
Some metals react with oxygen to make ……...
 
Oxides
 
Nitrates
 
Sulfates
 
Salts
From metal elements common physical properties is
 
Shiny
 
Liquids
 
Insulators
 
Dull
Which of the following represents sodium peroxide formula
 
Na2O2
 
Na2O
 
NaO2
 
NaO
Which of the following is an example of an endothermic reaction?
 
Ice melting into water
 
Explosion of fireworks
 
A candle flame giving off heat
 
Burning wood
1- Which statement best describes an exothermic reaction?
 
A reaction that releases heat to its surroundings
 
A reaction that absorbs heat from its surroundings
 
A reaction that does not involve energy
 
a) A reaction that only happens in cold conditions
True or False Helium is an inert non-metal element.
True
True or False Reactivity decreases from bottom to top of the series.
False
True or False Zinc is sacrificed to protect iron in steel ships.
True
True or False Inert substances take part in chemical reactions.
False
True or False Magnesium is more reactive than zinc.
True
True or False The reactivity series lists metals in order of how readily they react.
True
True or False Gold is more reactive than copper.
False
True or False Copper reacts easily with oxygen and water.
False
Which metal reacts vigorously with water and oxygen?
 
Potassium
 
Gold
 
Copper
 
Silver
Which non-metal is inert?
 
Neon
 
Carbon
 
Oxygen
 
Sulfur
What happens when zinc is attached to a steel ship?
 
Zinc prevents rust by reacting first
 
Zinc makes the ship heavier
 
Zinc increases corrosion
 
Zinc reacts slower than iron
Which of the following is NOT an inert metal?
 
Iron
 
Palladium
 
Rhodium
 
Platinum
In the reactivity series, metals become ______ as you go down the list.
 
Less reactive
 
Heavier
 
More magnetic
 
More reactive
Which metal is described as inert in the document?
 
Gold
 
Iron
 
Zinc
 
Magnesium
Which property makes copper suitable for cooking pans?
 
It is a good conductor of heat
 
It rusts easily
 
It is a poor conductor of heat
 
It reacts with acids
Which of these metals is less reactive than magnesium?
 
Copper
 
Sodium
 
Zinc
 
Calcium
Copper is valuable because it is:
 
Malleable and unreactive
 
Brittle and reactive
 
Hard and easily corroded
 
Magnetic and soluble
Which metal is used for sacrificial protection on steel ships?
 
Zinc
 
Silver
 
Copper
 
Gold
Which of the following metals is the most reactive?
 
Potassium
 
Gold
 
Iron
 
Copper
Which term describes a substance that does not take part in chemical reactions?
 
Inert
 
Reactive
 
Corrosive
 
Conductive
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