Chemical Reactions

Properties of matter are characteristics or attributes that can be used to identify or describe a ______

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NGSS.MS-PS1-2

When conducting experiments, it is important to note the properties ______ and ______ the reactions.

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NGSS.MS-PS1-2

Which of the following is an example of a chemical reaction?

• Melting ice
• Boiling water
• Burning paper
• Mixing salt and sugar

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

What are reactants and products in a chemical reaction?

• Reactants and products are substances that have different properties before and after a chemical reaction
• Reactants are the substances that are formed in a chemical reaction, and products are the substances that are present before the reaction
• Reactants and products are the same substances in a chemical reaction
• Reactants are the substances that are present before a chemical reaction, and products are the substances that are formed during the reaction

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is an example of a substance that undergoes a chemical reaction?

• Iron rusting
• Salt dissolving in water
• Sugar dissolving in coffee
• Ice melting into water

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Why do the products formed in a chemical reaction have different properties compared to the reactants?

• Because the atoms rearrange themselves
• Because the products are larger in size
• Because the reactants disappear
• Because the products are made of different elements

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NGSS.MS-PS1-1

NGSS.MS-PS1-2

How can we determine that a chemical reaction has occurred?

• By measuring the density of the reactants and products
• By analyzing the molecular structure of the reactants and products
• By comparing the boiling points of the reactants and products
• By observing changes in the properties of the substances involved

Tags

NGSS.MS-PS1-2

What is the difference between physical and chemical properties?

• Physical properties describe how a substance behaves during a chemical reaction, while chemical properties can be observed without changing the substance
• Physical properties can be observed without changing the substance, while chemical properties describe how a substance behaves during a chemical reaction
• Physical properties and chemical properties cannot be observed or measured
• Physical properties and chemical properties are the same thing

What happens to the properties of substances during a chemical reaction?

• The properties of substances remain the same
• The properties of substances become more intense
• The properties of substances change
• The properties of substances become less noticeable

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Why is it important to compare properties before and after a chemical reaction?

• To determine the color change
• To calculate the weight difference
• To assess changes in properties
• To identify the shape transformation

Tags

NGSS.MS-PS1-2