G8- T2L3: Modeling Chemical Reactions Quiz

What does a chemical equation convey?

• The identities of the molecules involved in the reaction

• The colors of the reactants

• The location of the reaction

• The temperature of the reaction

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

What is the purpose of coefficients in a chemical equation?

• To increase the temperature of the reaction

• To balance the equation

• To change the color of the products

• To speed up the reaction

Tags

NGSS.MS-PS1-5

Which type of reaction is represented by the equation 2Mg + O2 → 2 MgO?

• Combustion

• Replacement

• Decomposition

• Synthesis

What is the Law of Conservation of Mass?

• Matter is neither created nor destroyed in a chemical reaction

• Matter changes form in a chemical reaction

• Matter can be created in a chemical reaction

• Matter is destroyed in a chemical reaction

Tags

NGSS.MS-PS1-5

In a closed system, what can scientists do?

• Stop the reaction from occurring

• Change the reactants midway

• Only observe the reaction

• Manipulate and analyze the contents of the system

Tags

NGSS.HS-PS1-3

NGSS.HS-PS3-4

What type of reaction is represented by the equation 2 H2O2 → 2H2O + O2?

• Decomposition

• Synthesis

• Replacement

• Combustion

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What do the numbers in front of each component in a chemical equation represent?

• The color of the products

• The temperature of the reaction

• How many particles of the reactants are needed and how many particles of products are formed

• The speed of the reaction

Tags

NGSS.HS-PS1-7

What is the difference between an open system and a closed system?

• An open system allows matter to enter and escape, while a closed system does not allow matter to escape

• An open system has more reactants, while a closed system has more products

• An open system is always closed, while a closed system is always open

• An open system is always hot, while a closed system is always cold

What is the main purpose of a chemical equation?

• To describe a chemical reaction using symbols instead of words

• To slow down communication

• To complicate the subject

• To confuse students

Tags

NGSS.MS-PS1-1

What is the difference between an exothermic and endothermic reaction?

• An exothermic reaction absorbs heat, while an endothermic reaction releases heat

• An exothermic reaction releases heat, while an endothermic reaction absorbs heat

• An exothermic reaction only occurs in open systems, while an endothermic reaction only occurs in closed systems

• An exothermic reaction produces light, while an endothermic reaction produces sound

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

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