Answers PBCSD_Grade_Forgiveness_2003310_Physical Science_S1_2022Changes of State

Changes of State — Unit test Answers

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Which shows the correct order of steps during the formation of an ionic bond?

Ions are attracted to each other → Electrons are transferred → An ionic compound forms

An ionic compound forms → Ions are attracted to each other → Electrons are transferred

Electrons are transferred → Ions form → Ions are attracted to each other

Ions form → Electrons are transferred → Ions are attracted to each other

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Iodine and potassium form an ionic bond. Iodine has seven electrons in its outer shell, and potassium has one electron in its outer shell. Which conclusion is best supported by this information?

Iodine is a noble gas.

Potassium is a nonmetal.

Iodine becomes an ion with a negative 1 charge.

Potassium becomes an ion with a positive 7 charge.

Which best explains why a firework being ignited is an example of an exothermic reaction and not an endothermic reaction?

The fireworks produce colors.

The fireworks give off heat.

Igniting the fireworks requires energy.

Igniting the fireworks makes an odor.

Which statement correctly describes why a compound is a pure substance?

A compound is not a pure substance because each of its molecules is made up of the atoms of two or more different elements.

A compound is a pure substance because its molecule cannot be broken down into simpler particles by physical means.

A compound is not a pure substance because it is not an element, and only elements are pure substances.

A compound is a pure substance because it consists of two different elements, which are pure substances.

Which two elements will most likely form an ionic bond? (Click on the periodic table icon to view these elements)

krypton and lithium

magnesium and bromine

calcium and potassium

iodine and chlorine

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Changes of State — Unit test Answers

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