The model shows the change that occurs when two substances are mixed. How would this change be classified?

As a chemical change because a new substance is formed.

As a chemical change because a new substance is not formed.

As a physical change because a new substance is formed.

As a physical change because a new substance is not formed.

If more solvent is added to an aqueous solution, what happens to the concentration?

The volume increases, the amount of solute remains the same, and the concentration decreases.

The volume decreases, the amount of solute remains the same, and the concentration decreases.

The volume increases, the amount of solute increases, and the concentration increases.

The volume decreases, the amount of solute increases, and the concentration increases.

Will an aqueous solution stay an aqueous solution if we swap one solute for another solute?

Yes, because the solvent is water in both solutions.

No, because the solvent and solute create the solution.

Yes, because every solute is dissolved in any solvent.

No, because this changes the solution that is created.

Which can change the solubility of a solid in a liquid?

decreasing the temperature of the solution

increasing the pressure of the solution

Last week Antonio had a delicious cold, iced sweet tea from the corner store. This week he decided to make sweet tea at home. Antonio added two sugar cubes to a glass, then ice, cold water, and finally a tea bag. Antonio stirred the glass, and sugar remained at the bottom. Evaluate the steps he took. What should he have done to make the tea sweeter?

He should have started with hot water before adding the tea bag and sugar granules. Then, he should have stirred before finally adding ice.

He should have added less sugar as it will not dissolve because it has reached its solubility point.

He should have put the ice in first, followed by the tea bag, and then the water. The sugar should have been added last as it has a larger surface area than the cubes.

He should have added more sugar at the end in order to increase the sweetness of the drink because this way he would know how much to add.

Which of the set of actions is more likely to increase the rate of dissolution of a pill in water?

hot water, crush pill, stir constantly

hot water, crush pill, stir occasionally

hot water, cut pill in half, stir constantly

warm water, crush pill, stir at the beginning

The diagram shows one molecule of caffeine. A caffeine molecule has 8 atoms of ________________ , 10 atoms of ________________ , 4 atoms of ________________ , and ______ atoms of ___________________.

8 atoms of carbon, 10 atoms of hydrogen, 4 atoms of nitrogen, and 2 atoms of oxygen.

8 atoms of hydrogen, 10 atoms of carbon, 4 atoms of oxygen, and 2 atoms of nitrogen.

8 atoms of nitrogen, 10 atoms of oxygen, 4 atoms of carbon, and 2 atoms of hydrogen.

8 atoms of oxygen, 10 atoms of nitrogen, 4 atoms of hydrogen, and 2 atoms of carbon.

Scientists commonly work with corrosive acids in the laboratory, being careful to wear gloves and safety goggles or respirators to protect their skin and airways. Other acids are much weaker and are even found in common foods and drinks. The following table lists the names, chemical formulas, and common uses for four different acids.

Acetic acid contains the most atoms.

Perchloric acid contains sulfur atoms.

A molecule of sulfuric acid contains one hydrogen atom.

Carbonic acid is the main ingredient in vinegar.

Reference the following two drawings: Which of the following statements is true?

The element square from the periodic table with atomic number 7 is nitrogen.

Both the element square and the atom drawing represent the same element.

The atom drawing shown is nitrogen.

None of these statements is true.

The chemical formula for chocolate is C 7 H 8 N 4 O 2 . Use a periodic table to identify the types and number of each atom that makes up C 7 H 8 N 4 O 2 .

7 carbon atoms, 8 hydrogen atoms, 4 nitrogen atoms, and 2 oxygen atoms

7 cobalt atoms, 8 hydrogen atoms, 4 nitrogen atoms, and 2 oxygen atoms

7 carbon atoms, 8 helium atoms, 4 nitrogen atoms, and 2 oxygen atoms

7 cobalt atoms, 8 helium atoms, 4 neon atoms, and 2 oxygen atoms

Which of the following is an example of a chemical change?

blending milk and a banana to make a smoothy

Examine the following four figures showing solutions containing different amounts of a solute dissolved in different amounts of water. Which of the following statements is true?

Solution A is more concentrated than Solution B.

Solution B is more concentrated than Solution D.

Solution D is the most concentrated of the four solutions.

Solutions A and C have equal concentrations.

A chemist is investigating the effect of temperature and stirring on the rate of dissolution of a solid. She places 10g of the solid in each test tube and places the test tubes in the conditions summarized in the following table. She then records how long it takes for the solid to dissolve. What can you conclude from these results?

Higher temperature and stirring both affect the rate of dissolution, but temperature has a stronger effect.

Higher temperature and stirring both affect the rate of dissolution, but stirring has a stronger effect.

Higher temperature and stirring both affect the rate of dissolution about the same amount.

Higher temperatures increase the rate of dissolution and stirring has no effect.

There are many steps to making an omelette. Which of the following steps are a chemical change in matter?

Warm up eggs after they are taken out of the fridge.

Examine the following two figures. Each solution consists of 50g of NaNO 3 dissolved in water. Which of the following statements is true?

Solution A is more concentrated than Solution B.

Solution B is more concentrated than Solution A.

Both solutions have equal concentrations.

None of the statements are true.

Which of the following is NOT a true statement regarding solutions?

In a solution, the solute and solvent are chemically combined.

In a solution, a solute dissolves in a solvent.

Solutions may have color or be colorless.

People who are lactose intolerant can take a lactase pill before having milk or milk products. Lactase is an enzyme that breaks down lactose, the sugar in milk. Your friend wonders if it is better to take Brand X lactase, which recommends taking one large pill, or Brand Y lactase, which recommends taking two smaller pills. The pills are identical, except for their size. Therefore, the amount of lactase is the same for 1 pill of Brand X and 2 pills of Brand Y. What do you suggest to your friend if he wants the pills to dissolve quickly so they act faster?

Take Brand Y, because two smaller pills have a greater surface area than the single pill from Brand X so they will dissolve faster.

Take Brand X, because the larger pill has a greater surface area than the two smaller pills from Brand Y so they will dissolve faster.

Take Brand X, because the larger pill has a smaller surface area than the two smaller pills from Brand Y so they will dissolve faster.

Take Brand Y, because two smaller pills have a smaller surface area than the single pill from Brand X so they will dissolve faster.

Refer to the drawing of a burning candle. What types of changes to matter are occurring?

both a physical and a chemical change

You are making dinner and need to dissolve salt into your pot of water before you start cooking your pasta. The salt is dissolving at a slow pace. What could you do to speed up the rate at which the salt is dissolving?

heat the water to a higher temperature

put larger salt particles in the water

completely stop stirring the pot of water

slow down the speed at which you are stirring

A scientist combines a solution that is 40 percent helium gas and 60 percent nitrogen gas. Which gas is the solute, and which is the solvent?

nitrogen is the solvent and helium is the solute

helium is the solvent and nitrogen is the solute

What atoms are present in the compound represented by the chemical formula, Al₃(PO₄)₂?

3 atoms of aluminum, 2 atoms of phosphorus, and 8 atoms of oxygen

3 atoms of aluminum, 1 atom of phosphorus, and 4 atoms of oxygen

3 atoms of aluminum, 1 atom of potassium, and 4 atoms of oxygen

1 atom of aluminum, 2 atoms of potassium, and 8 atoms of oxygen

How does a molecule of an element differ from a molecule of a compound?

Molecules of an element contain only one type of atom, but molecules of a compound are composed of two or more types of atoms.

Molecules of an element contain one atom, but molecules of a compound contain two or more atoms.

Molecules of an element can be separated easily, but it is difficult to separate the molecules of a compound.

Molecules of an element only form gases, but molecules of a compound can exist in three different states of matter.

Magnesium hydroxide is a compound comprised of magnesium (Mg), hydrogen (H), and oxygen (O). The chemical formula for magnesium hydroxide is Mg(OH) 2 . What combination of atoms does this formula represent?

1 magnesium, 2 oxygen, and 2 hydrogen atoms

1 magnesium, 1 oxygen, and 1 hydrogen atom

1 magnesium, 1 oxygen, and 2 hydrogen atoms

2 magnesium, 2 oxygen, and 2 hydrogen atoms

A solution contains 100 g water, 5g sodium chloride, and 0.2g acetic acid. Which statement correctly identifies the components of this solution?

Water is a solvent; sodium chloride and acetic acid are solutes.

Water, sodium chloride, and acetic acid are all solutes.

Water and sodium chloride are solvents; acetic acid is a solute.

Water is a solvent; sodium chloride is a solute; acetic acid is neither a solvent nor a solute.

Changes to substances can be chemical changes or physical changes. Which of the following examples demonstrates a chemical change?

milk becoming sour when it stands on a kitchen counter

crystals forming in saltwater as water evaporates

sugar dissolving in a cup of hot tea when it is stirred

Unit 1 Test: Elements, Compounds, and Solutions (ALL QUESTIONS)

Authored by Chris Wild

Science

7th Grade

43 Questions

NGSS covered

Used 140+ times

Unit 1 Test: Elements, Compounds, and Solutions (ALL QUESTIONS)

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Recall the bath fizzy that bubbled in warm water at the beginning of the chapter. One main ingredient of a bath fizzy is baking soda, NaHCO₃. What elements make up this compound?

Nitrogen, Hydrogen, Cobalt

Sodium, Hydrogen, Cobalt

Nitrogen, Hydrogen, Carbon, Oxygen

Sodium, Hydrogen, Carbon, Oxygen

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

All substances are made of two or more types of elements.

True

False

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Use the periodic table to identify the atoms in the chemical formula AgNO₃ as well as the number of each kind of atom.

1 Silver, 1 Nitrogen, 1 Oxygen

1 Silver, 1 Nitrogen, 3 Oxygen

1 Silver, 3 Nitrogen, 3 Oxygen

3 Silver, 3 Nitrogen, 3 Oxygen

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which is an example of an element?

air

water

sodium

Sugar

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many compounds, elements, and atoms are present in magnesium hydroxide, Mg(OH)₂?

1 compound, 3 elements, and 5 atoms

2 compounds, 3 elements, and 6 atoms

1 compound, 2 elements, and 5 atoms

2 compounds, 3 elements, and 5 atoms

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

While on a hike in a forest, you observe the following changes as described in Table 1. Which change would be classified as a chemical change?

Change 1

Change 2

Change 3

Change 4

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which statement supports the claim that combining sodium and chlorine to make salt is a chemical change?

Salt has the same chemical and physical properties as chlorine.

Salt has the same chemical and physical properties as sodium.

Sodium and chlorine have different chemical and physical properties.

Salt has different chemical properties than sodium and chlorine.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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Unit 1 Test: Elements, Compounds, and Solutions (ALL QUESTIONS)

Recall the bath fizzy that bubbled in warm water at the beginning of the chapter. One main ingredient of a bath fizzy is baking soda, NaHCO3. What elements make up this compound?

All substances are made of two or more types of elements.

Use the periodic table to identify the atoms in the chemical formula AgNO₃ as well as the number of each kind of atom.

Which is an example of an element?

How many compounds, elements, and atoms are present in magnesium hydroxide, Mg(OH)₂?

While on a hike in a forest, you observe the following changes as described in Table 1. Which change would be classified as a chemical change?

Which statement supports the claim that combining sodium and chlorine to make salt is a chemical change?

The model shows the change that occurs when two substances are mixed. How would this change be classified?

Recall the bath fizzy that bubbled in warm water at the beginning of the chapter. The solute in the aqueous solution is ______ and the solvent is ______.

If more solvent is added to an aqueous solution, what happens to the concentration?

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Recall the bath fizzy that bubbled in warm water at the beginning of the chapter. One main ingredient of a bath fizzy is baking soda, NaHCO₃. What elements make up this compound?

Recall the bath fizzy that bubbled in warm water at the beginning of the chapter. The solute in the aqueous solution is and the solvent is .