Which statement correctly compares elements and compounds?

Elements are made of one kind of atom, compounds are made of two or more kinds of atoms.

If you have a solution with a high concentration of sugar and you add more water, what happens to the solution?

The solution becomes more diluted

Why is $$O_2$$ considered an element and $$CO_2$$ considered a compound?

$$O_2$$ is made of only oxygen atoms, $$CO_2$$ is made of carbon and oxygen atoms.

A student tears a piece of paper into small pieces. What type of change has occurred, and why?

Physical change, because the paper is still paper

Which solution is more concentrated: 10g of salt in 100mL of water or 10g of salt in 200mL of water?

The first solution, because it has less water

How could a student use chemical symbols and formulas to identify if a shiny, silver metal or a white powder is an element or a compound?

By checking if the substance has a single chemical symbol or a combination of symbols in its formula

Why is the formation of rust on iron a chemical change and not a physical change?

Because a new substance (rust) is formed with different properties

A student wants to make a lemonade solution less sweet. What should the student do, and why?

Add more water to dilute the solution

Which statement best describes a solution?

A mixture where substances are evenly distributed

What best describes an element?

A substance that cannot be broken down into simpler substances by chemical means

Compare and contrast elements and compounds in terms of their chemical formulas.

Elements have simple formulas, compounds have complex formulas.

How does temperature affect the rate of dissolution of a solid solute in an aqueous solution?

Higher temperature increases the rate of dissolution.

Why is sodium (Na) more reactive than neon (Ne)?

Sodium has one valence electron, while neon has a full outer shell.

Classify each as an element, compound, or mixture: Salt (NaCl), Air, Silver (Ag).

Salt (NaCl) - Compound, Air - Mixture, Silver (Ag) - Element

What should Jackson do to speed up the rate of dissolving salt in water?

He should heat the water to a higher temperature.

What are the 3 factors that affect rate of dissolution (how fast things dissolve)?

temperature, agitation, surface area

A solution is a homogeneous mixture formed when a solute is dissolved in a solvent.

What is the rate of dissolution?

The speed at which a solute dissolves in a solvent to form a solution.

Exploring Matter and Chemical Changes Flashcards

Student preview

50 questions

Show all answers

1.

FLASHCARD QUESTION

Front

Back

2.

FLASHCARD QUESTION

Front

Back

Two hydrogen atoms and one oxygen atom

3.

FLASHCARD QUESTION

Front

Which of the following is an example of a physical change? Burning wood, Melting ice, Rusting iron, Baking a cake

Back

Melting ice

4.

FLASHCARD QUESTION

Front

In a solution of saltwater, what is the solute?

Back

Salt

5.

FLASHCARD QUESTION

Front

What best describes a compound?

Back

A substance made of two or more different elements chemically combined

6.

FLASHCARD QUESTION

Front

Back

2

7.

FLASHCARD QUESTION

Front

Which of the following is a chemical change? Boiling water, Dissolving sugar in water, Burning a candle, Breaking a glass

Back

Burning a candle

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