Elements, Compounds, and Mixtures/Balancing Equations

Elements, Compounds, and Mixtures/Balancing Equations

Assessment

Flashcard

Science

8th Grade

Hard

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15 questions

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1.

FLASHCARD QUESTION

Front

What is the definition of a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded and can be separated by physical means.

2.

FLASHCARD QUESTION

Front

What distinguishes a compound from a mixture?

Back

A compound is a substance formed when two or more elements are chemically bonded together, while a mixture consists of two or more substances that are not chemically bonded.

3.

FLASHCARD QUESTION

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.

4.

FLASHCARD QUESTION

Front

How do you determine if a chemical equation is balanced?

Back

A chemical equation is balanced when the number of atoms of each element is the same on both sides of the equation.

5.

FLASHCARD QUESTION

Front

What is the weight of an ice cube after it melts?

Back

The weight of the ice cube remains the same after it melts; it will still weigh 20 grams.

6.

FLASHCARD QUESTION

Front

In a chemical reaction, if reactant A has 5g and product C has 9g, how do you find the weight of reactant B?

Back

To find the weight of reactant B, use the law of conservation of mass: weight of A + weight of B = weight of C. Therefore, B = C - A = 9g - 5g = 4g.

7.

FLASHCARD QUESTION

Front

What is an example of a homogeneous mixture?

Back

An example of a homogeneous mixture is saltwater, where the salt is completely dissolved in water.

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