Chemical Reactions and Equations - True/False

Your Progress 0 / 25 attempted
Q 01 / 25
Every chemical reaction must involve a change in energy.
Q 02 / 25
Rusting of iron is a physical change.
Q 03 / 25
Magnesium reacts with oxygen to form magnesium oxide.
Q 04 / 25
In a balanced chemical equation, the mass of reactants and products is equal.
Q 05 / 25
Chemical equations must show physical states of reactants and products.
Q 06 / 25
Precipitation is a type of chemical reaction.
Q 07 / 25
All combination reactions are exothermic.
Q 08 / 25
Decomposition reactions always require heat.
Q 09 / 25
The reaction of silver chloride with sunlight is an example of a photochemical reaction.
Q 10 / 25
Respiration in living organisms is a chemical reaction.
Q 11 / 25
Oxidation always means addition of oxygen to a substance.
Q 12 / 25
In displacement reactions, a more reactive element replaces a less reactive element from its compound.
Q 13 / 25
Photosynthesis is an example of an endothermic reaction.
Q 14 / 25
All decomposition reactions are the exact opposite of combination reactions.
Q 15 / 25
Chemical equations can be balanced by adjusting the coefficients only.
Q 16 / 25
Carbon dioxide is liberated when dilute hydrochloric acid reacts with sodium carbonate.
Q 17 / 25
The formation of curd from milk is a chemical change.
Q 18 / 25
Rust is produced when iron reacts with dry oxygen only.
Q 19 / 25
Precipitate does not form in a neutralization reaction.
Q 20 / 25
A chemical reaction cannot occur without a change in color, temperature, or state.
Q 21 / 25
Photosynthesis produces heat as a product.
Q 22 / 25
The reaction between lead nitrate and potassium iodide forms a yellow precipitate.
Q 23 / 25
Double displacement reactions always result in gas formation.
Q 24 / 25
Combination reactions always require heat to occur.
Q 25 / 25
Burning of magnesium ribbon produces a bright white light due to formation of magnesium oxide.
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