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