What is a valence electron?

an electron that is found in the outermost orbital of an atom.

an electron found in the innermost orbital of an atom.

an electron found in the middle orbital.

C10. Some uses of alloys are shown. Which statement about alloys is correct?

They have different properties to the metals from which they are made

They are always stronger than the metals from which they are made

They are made from metals because metals are poor electrical conductors

They contain mixtures of compounds that contain metals

Which best compares a homogeneous mixture and a heterogeneous mixture?

A homogenous mixture is the same throughout, while a heterogeneous mixture is not uniform throughout.

Homogeneous mixtures are formed through physical changes, while heterogeneous mixtures are formed through chemical changes.

Homogeneous mixtures are composed of two different liquids, while heterogeneous mixtures are composed of a solid and a liquid.

The particles in a homogeneous mixture will separate if left undisturbed, while the particles in a heterogeneous mixture cannot be filtered out of the mixture.

Why are the noble gases such as helium (He) and neon (Ne) grouped together in the periodic table?

They are highly reactive metallic solids.

They are dangerous gases when combined with water.

They are liquid at room temperature and have high boiling points.

What happens to water molecules during the boiling process?

They move faster and move farther apart as they absorb heat.

They move faster and remain close together as they absorb heat.

They move more slowly but move farther apart as they lose heat.

They move faster and move farther apart as they lose heat.

Which is the best evidence that the creation of a precipitate is the result of a chemical reaction?

demonstrates a new substance has formed

demonstrates a temperature change

None of the above provide evidence of a chemical change.

Which best describes the sequences of the elements in Period 5 of the periodic table?

highly reactive metals, relatively nonreactive metals, metalloids, reactive nonmetals, nonreactive gases

highly reactive gases, relative nonreactive metals, metalloids, very nonreactive gases, nonreactive nonmetals

nonreactive gases, metalloids, nonreactive metals, highly reactive metals, highly reactive gases

nonreactive gases, nonreactive metals, highly reactive metals, metalloids, reactive nonmetals, reactive gases

Which best explains how periods on the periodic table are organized?

increasing atomic number from left to right

increasing number of neutrons from left to right

decreasing number of electrons from left to right

decreasing atomic mass from left to right

Atoms are the smallest unit of an element and are composed of subatomic particles. An atom that has a balanced charge is referred to as “neutral”. Which of the following statements must be true about a neutral atom?

The number of electrons and protons in the atom must be equal.

The atom must have an even number of protons.

The atom must have as many neutrons as protons.

All of the neutrons and protons are found in the nucleus of an atom.

Francine’s mother made a fruit salad for breakfast. While Francine was eating her fruit salad, she exclaimed to her mother, ”I’m enjoying this mixture!”. Why did Francine refer to the fruit salad as a mixture?

The fruit salad contains various ingredients that each retain their original chemical properties.

The fruit salad contains various ingredients mixed in fixed amounts.

The fruit salad contains components whose original chemical properties have been changed after mixing.

The fruit salad contains various ingredients that can be separated only by using chemical means.

If an atom has no charge, which of the following must be true?

Its number of protons is equal to its number of electrons.

It has more neutrons than protons or electrons.

There are only neutrons inside the atom.

The neutrons in the atom outnumber the electrons and protons.

Select all of the statements below that are correct to describe the structure and properties of ionic compounds...

They have high melting and boiling points

They can conduct electricity when molten

The ions are held together by intermolecular forces

They can conduct electricity when solid

Magnesium bromide is an ionic compound with the chemical formula MgBr₂. What does the "2" tell you?

There are 2 bromide ions for every magnesium ion

There are 2 magnesium ions to every bromide ion

Why do metals have high melting points?

The negatively charged electrons act as a glue to hold the positively charged ions together.

All the electrons become delocalised

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