Emily created a table to highlight the similarities and differences between the properties of metals and nonmetals.

Question

Most Metals

good conductor

bigh melting point not malleable

hard

Most Nonmetals

poor conductor low melting point

malleable

not hard

Emily made an error in her table. Which option best explains the mistake she made?

(1 point)

Most metals are malleable, while most nonmetals are not

Most metals have low melting points, while most nonmetals have high melting points.

Most metals are poor conductors, whereas most nonmetals are good conductors.

Most metals are soft, whereas most nonmetals are hard

Answer 1

The best explanation for the mistake Emily made in her table is:

Most metals are malleable, while most nonmetals are not.

This is because the statement in her table that says "not malleable" is incorrect regarding metals, as most metals are indeed malleable.

Answer 2

Which of the following elements is most chemically similar to sulfur (S)? (1 point)

Phosphorus (P)

Oxygen (0)

Sodium (Na)

Chlorine (CI)

Answer 3

The element that is most chemically similar to sulfur (S) is Phosphorus (P).

Both sulfur and phosphorus are in the same group (Group 16 for sulfur and Group 15 for phosphorus) of the periodic table and share similar chemical properties. Oxygen (O) is also similar, but since it is in the group above sulfur, phosphorus is the closest in terms of chemical similarity.

Answer 4

He understands that if he places the electrodes in deionized water, it won't conduct electricity and his circuit will not function. Which compound could Tony mix with the water to ensure his circuit works?

(1 point)

NaCl (salt) because it is an covalent compound that will dissociate in water and enable the water to conduct electricity.

NaCl (salt) because it is an ionic compound that will dissociate in water, allowing the water to conduct electricity.

CHO (sugar) because it is a ionic compound that will dissolve in water and will dissociate to make the water conduct electricity.

CHO (sugar) because it is a covalent compound that will dissolve in water and will dissociate to make the water conduct electricity,

Answer 5

The correct option is:

NaCl (salt) because it is an ionic compound that will dissociate in water, allowing the water to conduct electricity.

NaCl is an ionic compound, and when it dissolves in water, it dissociates into its constituent ions (Na⁺ and Cl⁻), which enables the solution to conduct electricity.

Answer 6

What is the formula for the compound formed when a potassium ion (K) combines with a sulfide ion (S-)? (1 point)

OKS3

OKS

O KS2

OKS

Answer 7

The formula for the compound formed when a potassium ion (K⁺) combines with a sulfide ion (S²⁻) is:

K₂S.

However, since this specific option is not listed in your question, it seems there may be a misunderstanding in the choices provided.

Given the choices listed, you should note that:

• Potassium has a charge of +1 (K⁺).
• Sulfide has a charge of -2 (S²⁻).

To balance the charges, you need two potassium ions for every sulfide ion (2 K⁺ and 1 S²⁻), which gives K₂S.

If K₂S is not an option, it seems there may be an error in the question. Please double-check the options provided.

Answer 8

How many of each atom does one molecule of dinitrogen tetroxide contain? (1 point)

two nitrogen atoms and two oxygen atoms.

four nitrogen atoms and two oxygen atoms.

four nitrogen atoms and four oxygen atoms.

Otwo nitrogen atoms and four oxygen atoms.

Answer 9

The correct answer for the number of each atom in one molecule of dinitrogen tetroxide (N₂O₄) is:

Two nitrogen atoms and four oxygen atoms.

This is because the prefix "di-" indicates two nitrogen atoms and "tetra-" indicates four oxygen atoms, resulting in the formula N₂O₄.

Answer 10

Tina fills two balloons with an equal amount of helium gas. She puts one balloon in the freezer and, after twenty minutes, takes it out. She observes that this balloon is smaller than the one that remained at room temperature. The balloons are shown below.

from the freezer

room temperature

How can Tina accurately explain the difference in the size of her balloons?

(1 point)

She says that a decrease in temperature causes the volume of helium gas to increase.

She explains that an increase in temperature causes the volume of helium gas to expand.

She says that an increase in pressure raises the volume of helium gas.
She says that a decrease in pressure reduces the volume of helium gas.

Answer 11

The correct explanation for the difference in the size of Tina's balloons is:

She explains that an increase in temperature causes the volume of helium gas to expand.

According to the gas laws, specifically Charles's Law, when the temperature of a gas increases, its volume also increases if the pressure remains constant. Conversely, when the temperature decreases, the volume of the gas decreases, which is what Tina observed with the balloon that was placed in the freezer.