What are the three main types of questions covered in the first batch of questions (66-68)?

• Percent composition, atomic mass calculation, and balancing equations

• Acid-base reactions, redox reactions, and titrations

• Thermodynamics, kinetics, and equilibrium

• Molecular geometry, electron configuration, and stoichiometry

What is the formula mass of antimony in the compound stibnite (Sb2S3)?

• 121.8 grams per mole

• 244 grams per mole

• 340 grams per mole

• 122.9 grams per mole

How do you calculate the atomic mass of an element with isotopes of different masses and abundances?

• Divide the total mass by the total number of atoms

• Subtract the smallest mass from the largest mass

• Multiply each mass by its abundance and add the results

• Add the masses and divide by the number of isotopes

What is the correct coefficient for oxygen when balancing the roasting of stibnite equation?

• 2

• 6

• 9

• 4

Tags

NGSS.HS-PS1-7

What type of bonds are present in ammonium chloride (NH4Cl)?

• Covalent and ionic

• Metallic and covalent

• Ionic and metallic

• Hydrogen and covalent

Tags

NGSS.HS-PS1-2

What evidence indicates that the ammonium chloride solution is saturated?

• The temperature increases

• The solution is clear

• The solution changes color

• Some ammonium chloride remains undissolved

Tags

NGSS.MS-PS1-2

What happens to the temperature of water when ammonium chloride dissolves in it?

• It increases

• It decreases

• It remains the same

• It fluctuates

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

What is the phase of carbon dioxide produced in the combustion of pure carbon?

• Gas

• Plasma

• Liquid

• Solid

Tags

NGSS.MS-PS1-4

What does the addition of sodium chloride to icy roads do to the freezing point of water?

• Lowers it

• Raises it

• Keeps it the same

• Has no effect

Tags

NGSS.HS-PS1-5

Why should a mixture with more than 25% sodium chloride not be used on residential roads?

• It exceeds the town's regulation

• It is ineffective

• It is too corrosive

• It is too expensive

Tags

NGSS.HS-ETS1-3