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Science TEKS 8.6B & 8.6E

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Science

8th Grade

Science TEKS 8.6B & 8.6E
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15 questions

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1.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

What is the significance of coefficients in a chemical equation?

Coefficients indicate the number of molecules or moles of a substance involved in the reaction.

Coefficients represent the temperature at which the reaction occurs.

Coefficients are used to balance the charges in a chemical equation.

Coefficients determine the color of the substances involved in the reaction.

2.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

What is the balanced equation for the reaction of iron and oxygen to form iron(III) oxide?

3 Fe + 2 O₂ → Fe₂O₃

4 Fe + 3 O₂ → 2 Fe₂O₃

2 Fe + 3 O₂ → Fe₂O₃

Fe + O₂ → FeO

3.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

Why is it important to balance chemical equations?

To ensure that the law of conservation of energy is upheld.

To ensure that the law of conservation of mass is upheld.

To make the equations easier to read.

To increase the speed of the reaction.

4.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

What is the molecular formula for water?

H₂O

CO₂

NaCl

C₆H₁₂O₆

5.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

What does it mean for a chemical equation to be balanced?

The number of atoms of each element is the same on both sides of the equation.

The total mass of the reactants is greater than the total mass of the products.

The number of molecules of reactants is equal to the number of molecules of products.

The reaction occurs at a constant temperature.

6.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

What happens to mass during a chemical reaction?

Mass is destroyed; the total mass of reactants is less than the total mass of products.

Mass is created; the total mass of reactants is greater than the total mass of products.

Mass is conserved; the total mass of reactants equals the total mass of products.

Mass can change depending on the temperature of the reaction.

7.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

What is an example of a chemical reaction?

The reaction between baking soda and vinegar that produces carbon dioxide gas.

Mixing salt and water to create a saline solution.

Heating ice to melt it into water.

Combining iron and sulfur to form iron sulfide without heat.

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