In this equation, the total mass of the reactants is

equal to the total mass of the products

greater than the total mass of the products

In this reaction, the total mass of CaCO₃

equals the mass of CaO plus the mass of CO₂

is less than the mass of CaO plus the mass of CO₂

is greater than the mass of CaO plus the mass of CO₂

equals the mass of CaO minus the mass of CO₂

Identify the number of atoms of each element that comprises the compound below. C₆H₁₂O₆ C has ___ atoms H has ___ atoms O has ___ atoms

C has 6 atoms, H has 12 atoms, O has 6 atoms.

C has 12 atoms, H has 6 atoms, O has 6 atoms.

C has 6 atoms, H has 6 atoms, O has 12 atoms.

C has 12 atoms, H has 12 atoms, O has 6 atoms.

Balance the following equation by adding the appropriate coefficient in the appropriate blanks. If there is no coefficient needed, put 1 to indicate there is only 1 molecule of that substance. ___ CO + ___ NO → ___ N₂ + ___ CO₂

_2_ CO + _2_ NO → _1_ N₂ + _2_ CO₂

_3_ CO + _2_ NO → _2_ N₂ + _1_ CO₂

_2_ CO + _2_ NO → _2_ N₂ + _2_ CO₂

_1_ CO + _1_ NO → ___ N₂ + _1_ CO₂

Which of the following shows an exothermic reaction?

2H₂O + energy → 2H₂ + O₂

6CO₂ + 6H₂O + energy → C₆H₁₂O₆ + 6O₂

Tori dissolved two solids (Solid A and Solid B) into separate beakers, forming two clear liquids. Then, she mixed those two clear liquids together. She found that a yellow solid was formed (Solid P) as shown in the video above. She recorded color, solubility, and density of the solids before and after mixing in Table 1. Look for a pattern in the data table to write a scientific explanation stating whether the yellow solid (Solid P) formed from Solid A and B was a chemical reaction.

Yes, because a new substance with different densities and solubility.

No, because the solids just mixed physically without any change in properties.

Yes, because the density of the resulting solid is higher than the original solids.

No, because the color change is not significant.

A student has a mixture of sugar and water. What is the best method for the student to use to separate the sugar from the water?

pouring off the water from the mixture

How does the model show that the mass is conserved during the reaction?

The model shows mass conservation by balancing the number of atoms on both sides of the equation.

The model shows mass conservation by changing the mass of reactants and products.

The model shows mass conservation by increasing the mass of products.

The model shows mass conservation by decreasing the mass of reactants.

Student 1 claims that whenever the color of a substance changes, a chemical change has occurred. Student 2 claims that food coloring can change the color of a substance without causing a chemical change. To test their claims, the students add red food coloring to a glass of water. The students observe that the clear water turns a light pink color. Their teacher then runs a test to show that the pink solution contains both water molecules and food-coloring molecules. Based on these findings, which student is correct?

Student 2, because no new substance was formed when there was a color change

Student 1, because the food-coloring molecules were found in the pink solution

Student 1, because the state of matter changed when the food coloring was added

Student 2, because the red food coloring caused the water to change to a pink color

An experiment was conducted to observe the effects of acid rain on building materials such as limestone, often used for statues and monuments. Three pieces of limestone were carved with the same pattern and placed in tubes A, B, and C. Tube A contains water only. Tube B contains water and carbon dioxide from the student blowing into the water through a straw. Tube C contains vinegar (to simulate acid rain) Based on the results of the experiment, what effect can acid rain have on statues and monuments?

B) Acid rain can chemically weather a statue or monument

A) Acid rain can physically weather a statue or monument

C) Acid rain makes monuments invisible

D) Acid rain has no effect on statues or monuments

A mountain showed the following change in profile over millions of years. What happened to most of the material removed from the mountain?

The material weathered to form new sediments.

The material was absorbed by plant roots.

The material disintegrated from exposure to sunlight.

The material was destroyed by chemical reactions.

Advance Unit 3 Review

Authored by Morgan Tully

Science

6th Grade

NGSS covered

Used 15+ times

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30 questions

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MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Why are these changes classified as chemical changes?

A. New substances formed

B. Materials take different shapes

C. Temperature affects the objects

D. Some energy is absorbed

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

When baking soda reacts with vinegar, bubbles form and the container feels cold. This is an example of:

A. Exothermic reaction - energy is released.

B. Endothermic reaction - energy is absorbed from the surroundings.

C. Neither endothermic nor exothermic - no energy transfer occurs.

D. The coldness is due to the vinegar, not the reaction itself.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

NGSS.MS-PS3-4

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

The formation of an ionic bond involves the

transfer of electrons.

sharing of neutrons.

transfer of neutrons.

sharing of protons.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

The formation of a covalent bond involves the

transfer of electrons.

sharing of electrons.

transfer of neutrons.

sharing of protons.

Tags

NGSS.HS-PS1-1

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Which type of matter can be separated by physical means?

atom

element

compound

mixture

MATCH QUESTION

2 mins • 1 pt

The chart below lists samples of three materials. Classify each sample in the chart as an element, a compound, or a mixture by selecting the correct classification from the drop down menu.

Mixture

Salt dissolved in water

Element

hydrogen chemically combined with oxygen

compound

Noble Gas

Tags

NGSS.MS-PS1-2

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Advance Unit 3 Review

Why are these changes classified as chemical changes?

When baking soda reacts with vinegar, bubbles form and the container feels cold. This is an example of:

The formation of an ionic bond involves the

The formation of a covalent bond involves the

Which type of matter can be separated by physical means?

The chart below lists samples of three materials. Classify each sample in the chart as an element, a compound, or a mixture by selecting the correct classification from the drop down menu.

In this equation, the total mass of the reactants is

The diagram below represents two atoms in a molecule of oxygen that combine chemically with one atom of carbon to form a carbon dioxide molecule. Carbon dioxide is an example of:

Which property of water allows it to dissolve many different substances?

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