Chemistry EOY Practice

Elements with the same valence electron configuration can be expected to have similar

• atomic mass.

• chemical reactivity.

• numbers of protons.

• numbers of electrons.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

A neutral chlorine (Cl) atom contains 17 protons and 18 neutrons. How many electrons are there in a chlorine ion (Cl⁻)?

• 17

• 18

• 34

• 35

Which element has 2 electrons in the outermost energy level?

• cesium (Cs)

• magnesium (Mg)

• boron (B)

• argon (Ar)

Tags

NGSS.HS-PS1-1

What is the chemical formula of copper (II) sulfate?

• CuSO₄

• Cu₂SO₄

• Cu(SO₄)₂

• Cu₂(SO₄)₂

Compounds can be classified as covalent or ionic by noting the location on the periodic table for each atom in the compound. Which compound is covalently bonded?

• sodium chloride (NaCl)

• sulfur dioxide (SO₂)

• potassium bromide (KBr)

• magnesium chloride (MgCl₂)

The ions in calcium chloride dissociate (breaks apart) in the presence of water. What is the cation that is produced in this reaction?

• hydrogen (H⁺)

• oxygen (O⁻²)

• calcium (Ca⁺²)

• chlorine (Cl⁻)

Tags

NGSS.HS-PS1-2

Metallic bonding allows relatively free movement of electrons between atoms. This bonding results in the malleability of substances. A sample of which substance would most likely exhibit malleability?

• ozone (O₃)

• copper (Cu)

• sodium chloride (NaCl)

• hydrogen peroxide (H₂O₂)

Oxygen atoms have an electronegativity value of 3.44, and carbon atoms have an electronegativity value of 2.55. What type of bond forms between carbon and oxygen?

• ionic bond

• pure covalent bond

• polar covalent bond

• nonpolar covalent bond

Which of these statements correctly describes an intensive property of a sample of material in a lab investigation?

• The mass of the material is 153 g.

• The volume of the material is 193 mL.

• The temperature of the material is 26°C.

• The boiling point of the material is 56°C.

After Jimmy placed raw potato slices and hydrogen peroxide (H₂O₂) in a plastic bag, he concluded that an exothermic reaction had taken place. Which of the following supports Jimmy's conclusion?

• The plastic bag got cooler.

• The plastic bag got warmer.

• The potatoes changed color.

• The hydrogen peroxide (H₂O₂) bubbled.

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4