A light is turned on. Identify the energy transformation(s).

Electrical energy $$\rightarrow$$ light energy and heat energy

Sodium chloride (Salt), is made up of different elements, sodium and chlorine. Which statement identifies this combination as a mixture or a pure substance?

Since salt molecules all have a consistent ratio of sodium to chlorine, it is a pure substance.

A closed container was filled with a blue-colored gas. After some time, the gas uniformly filled the entire container. Next the container was placed on a hot plate. What happens to the gas particles?

The gas particles resumed movement as a result of heat transfer from the hot plate, making the particles move faster.

A rock was dropped into a beaker of water and sank to the bottom. Later it was dropped into a bucket of water. What happened to the rock in the bucket?

The rock sank because the density of a substance is the same regardless of the amount.

When sodium reacts with chlorine, table salt (sodium chloride) forms. Identify the statement that best describes the properties of these substances.

All of these substances have different chemical and physical properties.

Why does the pot become hot when placed on a stove and the stove is turned on?

The pot is gaining energy (heat) from the stove.

Pure sodium metal explodes when it makes contact with water. In its natural state, chlorine is a deadly, poisonous gas. When these two chemicals combine, they form sodium chloride or table salt. Which statement does this information support?

When substances are chemically combined, the properties of the newly formed substances are often different from the properties of the original substances.

What is the difference between atoms and molecules?

Atoms are the most basic unit of an element; molecules are atoms chemically bonded together.

Why is the mass of the solution in the beaker less than 30 grams after adding 15g of water and 15g of alka seltzer, which bubble and fizz?

The gas released during the chemical reaction changed the mass.

Select the statement that correctly identifies the energy position(s) on the roller coaster image.

At point B the cart has more kinetic energy than the cart at point D .

On a roller coaster ride, how is energy transferred?

Energy is transferred through changes in potential and kinetic energy.

Why did the book, which had kinetic energy, stop?

The kinetic energy was transformed into heat energy (as a result of friction).

Energy transformation in a car's engine.

chemical energy is converted into heat energy which is converted into mechanical energy

How did the pan handle get hot when John accidentally grabbed it?

The pan is touching the hot burner, the entire pan, including the handle heats up, thus burning John's hand when he touches it.

Semester 1 Review Flashcards

Student preview

29 questions

Show all answers

1.

FLASHCARD QUESTION

Front

Which part of the diagram represents the protons? Options: orange circles (+), green circles, blue circles (-), black rings

Back

orange circles (+)

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S8P1

2.

FLASHCARD QUESTION

Front

Which particles are positively charged and need to be separated so that they don't repel?

Back

protons

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S8P1

3.

FLASHCARD QUESTION

Front

In the decomposition of water, if the reaction begins with 4 atoms of hydrogen (H), how many hydrogen atoms (H) should be in the products?

Back

4 atoms of hydrogen (H)

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S8P1

4.

FLASHCARD QUESTION

Front

What prediction can you make about elements in the same family (group) on the periodic table?

Back

They are chemically reactive in a similar way.

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S8P1

5.

FLASHCARD QUESTION

Front

Helium, Neon, Argon, and Krypton are examples of

Back

noble gases.

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S8P1

6.

FLASHCARD QUESTION

Front

Nitrogen has an atomic number of 7 and a mass number of 14.007. Describe an atom of Nitrogen.

Back

Protons: 7 Neutrons: 7

Tags

S8P1

7.

FLASHCARD QUESTION

Front

Examine the following equation: 2H₂ + O₂ → 2H₂O. What is the relation between the atoms shown by this equation?

Back

The arrangement of the atoms indicate a chemical change has occurred.

Tags

S8P1

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