Reaction Prediction

Sahil watched a demonstration in which a scientist combined two substances in a sealed container and analyzed the results. The ending substances did not look the same as the starting substances. Sahil was given a diagram with the repeating groups of atoms that make up the starting substances, plus information about the properties of the starting and ending substances. He created a model of the repeating groups of atoms that might make up the two ending substances. Does his model correctly show why the properties of the ending substances are different from the properties of the starting substances? Describe what could be correct or incorrect about his model.

• Sahil’s model contains both correct and incorrect elements.

• Sahil’s model contains only correct elements.

• Sahil’s model contains only incorrect elements.

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

What type of reaction occurs in a hand warmer?

• exothermic

• endothermic

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

New substances are formed from a chemical reaction.

• true

• false

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is a product of the reaction between hydrochloric acid and sodium hydroxide?

• Water and sodium chloride

• Hydrogen gas and sodium chloride

• Chlorine gas and water

• Sodium and water

Tags

NGSS.MS-PS1-2

• Synthesis reaction

• Decomposition reaction

• Single replacement reaction

• Double replacement reaction

In a chemical reaction, the substances that undergo change are called:

• Reactants

• Products

• Catalysts

• Inhibitors

Tags

NGSS.MS-PS1-5

Which of the following reactions is an example of a decomposition reaction?

What is the main factor that determines the rate of a chemical reaction?

• Concentration of reactants

• Color of reactants

• Shape of container

• Type of solvent

Tags

NGSS.HS-PS1-5

Which of the following is a sign that a chemical reaction has occurred?

• Change in color

• Change in shape

• Change in size

• Change in mass

Tags

NGSS.MS-PS1-2

What is the role of a catalyst in a chemical reaction?

• It speeds up the reaction without being consumed

• It slows down the reaction

• It is consumed in the reaction

• It changes the products of the reaction