Chemical Reactions Quiz

What is a chemical bond?

• A) A new substance produced by a chemical reaction

• B) A description of a reaction using element symbols and chemical formulas

• C) An attraction between atoms when electrons are shared, transferred, or pooled

• D) The starting substance in a chemical reaction

What does the law of conservation of mass state?

• A) It describes a reaction in which the negative ions in two compounds switch places

• B) It states that the total mass of the reactants before a chemical reaction is the same as the total mass of the products after the chemical reaction

• C) It is a chemical reaction in which a substance combines with oxygen and releases energy

• D) It is a process in which atoms of one or more substances rearrange to form one or more new substances

Tags

NGSS.MS-PS1-5

What is a reactant?

• A) A number placed in front of an element symbol or chemical formula in an equation

• B) The starting substance in a chemical reaction

• C) A new substance produced by a chemical reaction

• D) A description of a reaction using element symbols and chemical formulas

What is a product in the context of a chemical reaction?

• A) The starting substance in a chemical reaction

• B) A new substance produced by a chemical reaction

• C) An attraction between atoms when electrons are shared, transferred, or pooled

• D) A description of a reaction using element symbols and chemical formulas

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The substances that are formed during a chemical reaction; in a chemical reaction the arrows point toward the product

• arrow

• chemical reaction

• reactants

• products

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The number before the chemical formula; it represents the number of molecules that are present Ex. 2H₂O₂, 2 molecules of H₂O₂

• reactant

• coefficient

• product

• subscript

Tags

NGSS.MS-PS1-5

The number to the lower right of an element symbol in a chemical formula that represents the number of atoms for that element Ex. H₂O, 2 atoms of hydrogen in the water molecule H₂O

• subscript

• reactant

• product

• coefficient

A chemical change; a process that changes substances into new substances

• physical change

• chemical reaction

• reactant

• product

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In the equation,          2Mg + O₂ ---> 2MgO, which are the reactants?

• Mg and O

• MgO

• Mg and MgO

• O and MgO

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During a chemical reaction, atoms cannot be created or destroyed, but they can be ________________.

• changed

• increased

• extended

• rearranged

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