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Tenth Grade (Grade 10) Reactions Questions

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Grade 10 Reactions
Which of the following is true for all chemical reactions?
  1. The total mass of the reactants increases.
  2. The total mass of the products is greater than the total mass of the reactants
  3. The total mass of the reactants equals the total mass of the products.
  4. The total mass of the products is less than the total mass of the reactants.
Grade 10 Reactions
CaCo3(s)+Heat -> CaO(s) + CO2 (gas), this reaction is a/an                                   .
  1. endothermic reaction
  2. exothermic reaction
  3. Neither of the above
  4. reaction in which catalyst is used
Grade 10 Reactions
What type of chemical reaction is P+O→PO?
  1. synthesis
  2. decomposition
  3. single replacement
  4. double replacement
Grade 10 Reactions
What type of reaction is 2Al+6HCl→3H2+2AlCl3?
  1. synthesis
  2. decomposition
  3. single replacement
  4. double replacement
Grade 10 Reactions
What type of reaction does the following equation represent?

FeS+2HCl→FeCl2+H2S
  1. synthesis reaction
  2. double-displacement reaction
  3. single-displacement reaction
  4. decomposition reaction
Grade 10 Reactions
What is the term used to describe the energy needed to get a reaction started?
  1. adhesion energy
  2. activation energy
  3. cohesion energy
  4. chemical energy
Grade 10 Reactions
The reaction in which oxidation and reduction takes place at the same time is called                   .
  1. redox reaction
  2. oxidation reaction
  3. reduction reaction
  4. none of the above
Grade 10 Reactions
What is the chemical formula for disulfur decafluoride?
  1. S10F2
  2. S3F9
  3. S2F10
  4. S2F8
Grade 10 Reactions
Which of the following includes an example of a chemical property of an element?
  1. Aluminum is a solid at room temperature and is a poor thermal insulator.
  2. Sulfur is not shiny and is not malleable.
  3. Sodium is a solid at room temperature and reacts with other elements.
  4. Silicon is shiny and is a poor conductor of electricity.
Grade 10 Reactions
What is the rate at which reactants change into products over time?
  1. production rate
  2. reaction rate
  3. interest rate
  4. chemical rate
Grade 10 Reactions
When water decomposes into hydrogen and oxygen, the mass
  1. increases.
  2. decreases if the temperature exceeds 100 degrees Celsius.
  3. remains constant.
  4. decreases its melting point.
Grade 10 Reactions
Reaction of 'magnesium' with air is called what?
  1. Exothermic reaction
  2. Endothermic reaction
  3. Reversible reaction
  4. Substitution reaction
Grade 10 Reactions
The gain of oxygen is known as                .
  1. oxidation
  2. reduction
  3. halogenation
  4. chlorination
Grade 10 Reactions
When hydrogen and oxygen combine to form water, water is
  1. a product.
  2. a reactant.
  3. both a product and reactant.
  4. neither a product nor a reactant.
Grade 10 Reactions
A substance that accelerates the rate of a chemical reaction is called a(n)
  1. catalyst.
  2. lipid.
  3. molecule.
  4. element.
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