8th Grade Physical Science Exam

What is a chemical reaction?

• A process that leads to the transformation of one set of chemical substances to another

• A process that leads to the transformation of energy

• A process that leads to the transformation of biological substances

• A process that leads to the transformation of physical substances

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What are the different types of chemical reactions?

• Addition, subtraction, multiplication, division

• Solid, liquid, gas, plasma

• Synthesis, decomposition, single displacement, double displacement, and combustion

• Acidic, basic, neutral, alkaline

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What are the properties of matter?

• Temperature and pressure

• Size and shape

• Physical and chemical characteristics

• Color and taste

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How do chemical reactions affect the properties of matter?

• Chemical reactions can change the composition and structure of matter, leading to changes in its properties.

• Chemical reactions can only change the temperature of matter

• Chemical reactions only affect the color of matter

• Chemical reactions have no effect on the properties of matter

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What is the law of conservation of mass in chemical reactions?

• Matter is neither created nor destroyed, only rearranged.

• Matter disappears completely in chemical reactions

• Matter is constantly created and destroyed

• Matter can be transformed into energy in chemical reactions

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What are the signs of a chemical reaction?

• No change in temperature

• Formation of a solid

• Increase in volume of liquid

• Change in color, production of gas, formation of a precipitate, change in temperature

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NGSS.MS-PS1-2

What are the different states of matter and their properties?

• Round, square, and triangle with different colors

• Hot, cold, and warm with different textures

• Red, blue, and green with different shapes

• Solid, liquid, and gas with different properties

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How do you classify matter based on its physical and chemical properties?

• By its color and shape

• By its physical and chemical properties

• By its location and size

• By its taste and smell

What are the differences between physical and chemical changes in matter?

• Chemical changes only affect the appearance of a substance

• Physical changes involve a change in the chemical composition of a substance

• Physical changes result in the formation of new substances with different chemical properties

• Physical changes involve a change in the form or appearance of a substance without changing its chemical composition, while chemical changes result in the formation of new substances with different chemical properties.

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How do you calculate the density of a substance?

• Mass divided by volume

• Density divided by volume

• Volume divided by mass

• Weight divided by volume