Chemistry STAAR Questions

Which statement accurately describes the atoms of a specific element?

• An indium‚ In‚ atom contains 115 protons inside the nucleus and 49 neutrons outside the nucleus.

• A scandium‚ Sc‚ atom contains 45 electrons outside the nucleus and 21 neutrons inside the nucleus.

• An aluminum‚ Al‚ atom contains 27 electrons and 27 protons inside the nucleus.

• A zinc‚ Zn‚ atom contains 30 protons inside the nucleus and 30 electrons outside the nucleus.

Tags

NGSS.MS-PS1-1

Which chemical reaction involves the fewest oxygen atoms?

• 
• 
• 
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Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which statement correctly describes the location and charge of the electrons in an atom?

• The electrons are inside the nucleus and have no charge.

• The electrons are outside the nucleus and have no charge.

• The electrons are inside the nucleus and have a negative charge.

• The electrons are outside the nucleus and have a negative charge.

The table lists some compounds found in foods and their formulas. Based on this information, which of these statements is NOT true?

• A molecule of sorbitol contains three more oxygen atoms than a molecule of glutamine does.

• A molecule of lactose contains twice as many atoms as a molecule of fructose does.

• A molecule of fructose contains four more atoms than a molecule of glutamine does.

• A molecule of lactose contains twice as many carbon atoms as a molecule of sorbitol does.

Tags

NGSS.MS-PS1-1

What is the total number of protons, neutrons, and electrons in a cadmium, Cd, atom that has a mass number of 112?

A manufacturer selected a metal to use in producing a lightweight button for clothing. A metal that has a density of 2.71 g/cm3 was selected.

Which of the metals was selected?

• Metal 1

• Metal 2

• Metal 3

• Metal 4

When an atom loses an electron, it becomes a

• positive ion

• negative ion

• neutral ion

• neutral atom

How does oxygen become an oxide ion?

• it loses 2 electrons

• it gains 2 electrons

• it shares electrons

• it releases energy

In a covalent bond, electrons are

• Gained

• Pulled apart

• Shared

• In the nucleus

Tags

NGSS.HS-PS1-1

A substance made up of atoms of two or more different elements joined by chemical bonds

• Compound

• Heterogeneous Mixture

• Homogeneous Mixture

• Solution

Tags

NGSS.MS-PS1-5