Category 1: Matter and Energy

​Category 1: Matter and energy

Multiple Choice

A certain substance contains more than one kind of atom. Its atoms are chemically combined. Which term best describes the substance?

• Compound

• Element

• Mixture

• Molecule

Multiple Choice

An experiment calls for a chemical with the formula $$NH_4$$  . How many atoms of each element are in the formula?

• 0 Nitrogen

  3 Hydrogen

• 1 Nitrogen

  1 Hydrogen

• 1 Nitrogen

  4 Hydrogen

• 4 Nitrogen

  1 Hydrogen

Multiple Choice

Which statement is supported from the data table?

• Both sample X and Sample Y are metals

• Both sample X and Sample Y are nonmetals

• Sample X is a nonmetal and Sample Y is a metal

• Sample X is a metal and Sample Y is a nonmetal

Multiple Choice

A piece of an unknown metal has a mass of 35.6 grams and a volume of 5.0 $$cm^3$$ . What is the possible identity of the element?

• Aluminum

• Gold

• Lead

• Zinc

Multiple Choice

Which best describes the particles that make up the part labeled X in the model?

• They all have no charge.

• They all have a positive charge.

• Some have a positive charge and some have no charge.

• Some have a positive charge and some have a negative charge.

Multiple Choice

Two pure substances consists of atoms that all have the same number of protons. However, the atoms of each substance have different numbers of valence electrons.

What must be true of these two substances?

• They react similarly

• They are the same element

• Their atoms have the same charge

• Their nuclei have different charges

Multiple Choice

Which grouping includes mostly elements that do not react readily?

• Grouping A

• Grouping B

• Grouping C

• Grouping D

Multiple Choice

A student mixes two substances together in a flask. Which observation could indicate that a chemical reaction is taking place in the flask?

• The flask heats up

• Bubbles of gas form in the flask

• The contents change color

• All of these

Multiple Choice

Which chemical equation correctly demonstrates the law of conservation of mass?