Chemistry Released NCFE

How many protons and electrons are in a ⁶⁴Cu²⁺ ion?

• 27 protons, 29 electrons

• 27 protons, 31 electrons

• 29 protons, 27 electrons

• 29 protons, 31 electrons

What is the name of the compound with the chemical formula CrCl₃?

• chromium tetrachloride

• chromium trichloride

• chromium(II) chloride

• chromium(III) chloride

If two oxygen atoms combine to make a molecule, what type of bond will they form?

• an ionic bond

• a hydrogen bond

• a double covalent bond

• a metallic bond

The half-life of phosphorous-32 is 14.3 days. How much of a sample of phosphorus-32 will remain after 57.2 days?

• 1/32

• 1/16

• 1/8

• 1/4

Tags

NGSS.HS-PS1-8

What is the net ionic equation for the reaction between aqueous solutions of LiBr and AgNO₃?

• Ag⁺(aq) + Br^-(aq) --> AgBr (s)

• Li⁺(aq) + NO₃^-(aq) --> LiNO₃ (s)

• Li⁺(aq) + Br^-(aq) --> LiBr (s)

• Ag⁺(aq) + NO₃^-(aq) --> AgNO₃ (s)

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

How does an S^2- ion differ from an electrically neutral sulfur atom?

• mass number

• atomic number

• nuclear charge

• number of electrons

A gas under a pressure of 74 mmHg and at a temperature of 75°C occupies a 500.0-L container. How many moles of gas are in the container?

• 1.7 moles

• 7.9 moles

• 13 moles

• 59 moles

Which one of these compounds is soluble in water?

• aluminum sulfide

• calcium carbonate

• iron(III) hydroxide

• potassium sulfate

In which block does an element with the electron configuration [Xe]6s²4f¹⁴5d¹⁰6p¹ belong?

• s block

• p block

• d block

• f block

Tags

NGSS.HS-PS1-1

What is the net ionic equation for the reaction between Pb(NO₃)₂ and HCl?

• Pb²⁺ (aq) + 2Cl^- (aq) → PbCl₂ (s)

• 2NO₃^- (aq) + 2H⁺ (aq) → 2HNO₃ (aq)

• Pb(NO₃)₂ (aq) + 2HCl(aq) → PbCl₂ (s) + 2HNO₃ (aq)

• Pb²⁺ (aq) + 2NO₃^- (aq) + 2H⁺ (aq) + 2Cl^- (aq) → PbCl₂ (s) + 2H⁺ (aq) + 2NO₃^- (aq)

Tags

NGSS.HS-PS1-7