8th Grade Unit 5 Review

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8th Grade Unit 5 Review

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8th Grade Unit 5 Review


Froggy Jumps 8th Grade Unit 5 ReviewVersion en ligne 8th Grade Unit 5 Review par Jeff 1 A ________________ DOES NOT produce new substances or products. a chemical change b endothermic chemical reaction c physical change 2 During a _____________________, one or more substances or reactants CHANGE into new substances or products. a chemical change b physical change c condensation event 3 A chemical reaction is a process in which atoms of one or more substances ________________ to form one or more new substances. a duplicate b disappear c rearrange 4 Which of the following would be an example of a physical change? a iron rusting b water evaporating c wood burning 5 Which of the following would be an example of a chemical change? a fireworks exploding b an ice cube melting c chopping wood 6 In which of the following circumstances, can you infer that a chemical reaction has occurred? a Bright copper turns green when it is placed in air. b Water changes to ice when it is placed in the freezer. c Neither of These 7 In which of the following circumstances, can you infer that a chemical reaction has occurred? a A piece of wood is carved into the shape of a baseball bat. b Meat begins to smell after it sits in the hot sun for a few hours. c Both of These 8 In which of the following circumstances, can you infer that a chemical reaction has occurred? a A nail rusts when it is left out in the rain for two days. b Both of These c A firefly gives off light when it flies in the backyard. 9 A _____________________ is a description of a chemical reaction using element symbols and chemical formulas. a chemical formula b chemical equation c chemical equilibrium 10 Some elements exist in nature as _____________________ -two atoms bonded together. These will be found with a subscript of 2. a Biatomic Molecules b Binary Compounds c Diatomic Molecules 11 The starting substances in a chemical reaction are referred to as a components b reactants c products 12 The substances produced by the chemical reaction are referred to as a components b reactants c products 13 Which of the following represents the appropriate structure for a chemical equation? a reactant + reactant -> product + product b reactant + product -> reactant + product c product + product -> reactant + reactant 14 The ______________________________ 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. a Law of Conservation of Energy b Law of Mass Equilibrium c Law of Conservation of Mass 15 I will be expected to know how to balance a chemical equation for this Summative Assessment. a TRUE - I should review this on R13 and it's Supplement b - c FALSE - I should troll people on reddit instead of reviewing this stuff 16 When hydrogen peroxide interacts with sunlight it undergoes a chemical change, which yields Water and Oxygen. What kind of chemical reaction does this represent? a Synthesis b Decomposition c Combustion 17 In a ________________________ reaction, one compound breaks down and forms two or more substances. a replacement b synthesis c decomposition 18 A ________________ reaction is a type of chemical reaction in which two or more substances combine to from one compound. a synthesis b combustion c decomposition 19 Magnesium reacts with Oxygen in the air and forms Magnesium Oxide. The previous sentence describes what kind of reaction? a Replacement b Synthesis c Decomposition 20 In a _________________ reaction, one element replaces another element in a compound. a single replacement b synthesis c combustion 21 Replacement reactions NEVER involve metal elements. a True b - c False 22 Combustion reactions always include Carbon Dioxide and Water as REACTANTS. a TRUE b - c FALSE 23 Combustion reactions always include Carbon Dioxide and Water as PRODUCTS. a TRUE b - c FALSE 24 Combustion reactions always include Oxygen as a REACTANT(s). a TRUE b - c FALSE 25 A combustion reaction usually releases energy as _________________________ energy. a thermal & kinetic b thermal & chemical c thermal & light 26 I will be expected to identify what type of chemical reaction is occurring by looking at a chemical equation on this summative assessment. a TRUE - I should review this on R14 b - c FALSE - I should watch cringe tiktoks instead of reviewing this stuff 27 Chemical bonds contain a form of energy called ________________ energy. a chemical b kinetic c electrical 28 When a chemical bond BREAKS, __________________. a it releases energy to the surroundings b no energy is released or absorbed c it absorbs energy from the surroundings 29 When a chemical bond FORMS, __________________. a it releases energy to the surroundings b no energy is released or absorbed c it absorbs energy from the surroundings 30 In physics and chemistry, the ______________________ states that the total energy of an isolated system remains constant; it is said to be conserved over time. a Law of Conservation of Mass b Law of Conservation of Energy c Law of Conservation of Volume 31 Chemical Reactions that ABSORB thermal energy are called ____________________. a endothermic b exothermic c ectothermic 32 Chemical Reactions that RELEASE thermal energy are called ____________________. a endothermic b exothermic c ectothermic 33 ________________________ is the minimum amount of energy needed to start a chemical reaction. a Activation Energy b Kinetic Energy c Inhibitor Energy 34 Which of the following could increase the rate of reaction in a chemical reaction? a increase surface area b increase temperature c Both of These 35 A(n) _________________ is a substance that increases a reaction rate by lowering the activation energy. a inhibitor b product c catalyst 36 A(n) ___________________ is a substance that slows, or even stops, a chemical reaction. a coefficient b catalyst c inhibitor

8th Grade Unit 5 Review

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8th Grade Unit 5 ReviewVersion en ligne

par Jeff

A ________________ DOES NOT produce new substances or products.

During a _____________________, one or more substances or reactants CHANGE into new substances or products.

A chemical reaction is a process in which atoms of one or more substances ________________ to form one or more new substances.

Which of the following would be an example of a physical change?

Which of the following would be an example of a chemical change?

In which of the following circumstances, can you infer that a chemical reaction has occurred?

In which of the following circumstances, can you infer that a chemical reaction has occurred?

In which of the following circumstances, can you infer that a chemical reaction has occurred?

A _____________________ is a description of a chemical reaction using element symbols and chemical formulas.

Some elements exist in nature as _____________________ -two atoms bonded together. These will be found with a subscript of 2.

The starting substances in a chemical reaction are referred to as

The substances produced by the chemical reaction are referred to as

Which of the following represents the appropriate structure for a chemical equation?

The ______________________________ 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.

I will be expected to know how to balance a chemical equation for this Summative Assessment.

When hydrogen peroxide interacts with sunlight it undergoes a chemical change, which yields Water and Oxygen. What kind of chemical reaction does this represent?

In a ________________________ reaction, one compound breaks down and forms two or more substances.

A ________________ reaction is a type of chemical reaction in which two or more substances combine to from one compound.

Magnesium reacts with Oxygen in the air and forms Magnesium Oxide. The previous sentence describes what kind of reaction?

In a _________________ reaction, one element replaces another element in a compound.

Replacement reactions NEVER involve metal elements.

Combustion reactions always include Carbon Dioxide and Water as REACTANTS.

Combustion reactions always include Carbon Dioxide and Water as PRODUCTS.

Combustion reactions always include Oxygen as a REACTANT(s).

A combustion reaction usually releases energy as _________________________ energy.

I will be expected to identify what type of chemical reaction is occurring by looking at a chemical equation on this summative assessment.

Chemical bonds contain a form of energy called ________________ energy.

When a chemical bond BREAKS, __________________.

When a chemical bond FORMS, __________________.

In physics and chemistry, the ______________________ states that the total energy of an isolated system remains constant; it is said to be conserved over time.

Chemical Reactions that ABSORB thermal energy are called ____________________.

Chemical Reactions that RELEASE thermal energy are called ____________________.

________________________ is the minimum amount of energy needed to start a chemical reaction.

Which of the following could increase the rate of reaction in a chemical reaction?

A(n) _________________ is a substance that increases a reaction rate by lowering the activation energy.

A(n) ___________________ is a substance that slows, or even stops, a chemical reaction.