Periodic Table and Basic Elements

What are the seven groups in the periodic table?

Answer explanation

The seven groups in the periodic table are: Alkali metals, Alkaline earth metals, Transition metals, Lanthanides, Actinides, Halogens, and Noble gases. Each group shares similar chemical properties.

Non-metals generally do not react with acids.

• True

• False

Answer explanation

Non-metals typically do not react with acids because they lack the necessary properties to displace hydrogen ions. Therefore, the statement is true.

What is formed when a metal reacts with an acid? (REACTANT) (PRODUCT)

• When a metal reacts with an acid, a salt and hydrogen gas are formed.

• When a metal reacts with an acid, water and carbon dioxide are formed.

• When a metal reacts with an acid, oxygen and salt are formed.

• When a metal reacts with an acid, hydrogen peroxide is formed.

Answer explanation

When a metal reacts with an acid, it produces a salt and hydrogen gas. This is a well-known reaction in chemistry, distinguishing it from the incorrect options that mention water, carbon dioxide, or other products.

Tags

NGSS.MS-PS1-2

What type of bond involves the transfer of electrons from metals to nonmetals?

Answer explanation

The bond that involves the transfer of electrons from metals to nonmetals is called an ionic bond. In this type of bond, metals lose electrons and become positively charged ions, while nonmetals gain those electrons to become negatively charged ions.

In covalent bonds, nonmetals ______ electrons.

• share

• lose

• gain

• transfer

Answer explanation

In covalent bonds, nonmetals share electrons to achieve a full outer shell, allowing them to bond together. This sharing of electrons is what characterizes covalent bonding, making 'share' the correct choice.

**Best way to take the Temperature outside with a thermometer?** In the shade, 4-6 feet above the ground, North facing. For the most accurate reading, use a liquid-in-glass or a digital thermometer. Place it so that it is not in direct sunlight at any time. The shade of a tree and a North-facing porch are two good places. Outside thermometers should Never Be Placed at Lower Ground Levels– It is best to place an outdoor thermometer between four to six feet off the ground level. When these devices are placed too close to ground level, they can easily get exposed to weather elements that will adversely affect the reading.

• In direct sunlight, 1-2 feet above the ground, South facing.

• In the shade, 4-6 feet above the ground, North facing.

• In the shade, 1-2 feet above the ground, East facing.

• In direct sunlight, 4-6 feet above the ground, West facing.

Answer explanation

The correct choice is 'In the shade, 4-6 feet above the ground, North facing' as it follows the guidelines for accurate temperature measurement, avoiding direct sunlight and being at the optimal height.

Which reaction represents the sublimation?

• It is the process of converting solid to gas directly without undergoing liquid phase. Sublimation is the transition of a substance directly from a solid state to a gas state. It does not pass through the usual liquid state, and only occurs at specific temperatures and pressures.

• It is the process of converting gas to liquid directly without undergoing solid phase.

• It is the process of converting liquid to solid directly without undergoing gas phase.

• It is the process of converting gas to solid directly without undergoing liquid phase.

Answer explanation

The correct choice defines sublimation as the process of converting solid to gas directly, bypassing the liquid phase. This accurately describes sublimation, which occurs under specific conditions without passing through the liquid state.

Tags

NGSS.MS-PS1-4

How does tossing heated water back into the ocean affect the environment?

• It increases ocean temperature and affects marine life.

• It cools down the ocean and benefits marine life.

• It has no effect on the ocean environment.

• It helps in the growth of coral reefs.

Answer explanation

Tossing heated water back into the ocean raises its temperature, which can disrupt marine ecosystems, harm species sensitive to temperature changes, and lead to decreased oxygen levels, negatively impacting marine life.

Tags

NGSS.MS-LS2-4

What was produced when the carbon dioxide that was dissolved in the oceans reacted with seawater?

• Calcium carbonate

• Sodium chloride

• Magnesium sulfate

• Potassium nitrate

Answer explanation

When carbon dioxide dissolves in oceans, it reacts with seawater to form carbonic acid, which can lead to the precipitation of calcium carbonate. This process is essential for marine life and the formation of shells.

Tags

NGSS.HS-ESS2-6

NGSS.HS-ESS2-5

What happens to ocean water when it absorbs CO2?

• It becomes more acidic.

• It becomes more alkaline.

• It remains neutral.

• It evaporates.

Answer explanation

When ocean water absorbs CO2, it reacts to form carbonic acid, which increases the concentration of hydrogen ions, leading to a decrease in pH. This process makes the water more acidic.

Tags

NGSS.HS-ESS2-6