Chem Spring

A compound has a mass of 2.6632x10² g/mol. The number of significant figures in this mass is —

• 2
• 4
• 5
• 7

When 1 g of sodium chloride (NaCl) is placed in 100 g of water, a solution results. Once the solution is prepared, water is now considered what part of the solution?

• Solid
• Liquid
• Solute
• Solvent 

How many electrons does the iron ion have when it forms the ionic compound FeCl₃?

• 20
• 23
• 26
• 29

If substance X is a liquid, substance Y is a gas, and substance Z is a solid, and all are at the same temperature and pressure, then the order of increasing strength of their intermolecular forces would be —

• X<Y<Z
• Y<X<Z
• Z<Y<X
• Y<Z<X

What is the empirical formula of the compound with the molecular formula C₆H₁₂?

• CH
• CH₂
• CH₄
• C₂H₆

A chemist is examining an unidentified element sample with oxidation states of +2,+3, and +6. The element has a shielding effect similar to that of potassium (K). Which statement about the unidentified element is most likely true?

• It has the same number of neutrons as potassium.
• It is a transition metal from the same period as potassium
• It is one of the heaviest elements in potassium’s group.
• It is a mix of three unstable isotopes of potassium.

Tags

NGSS.HS-PS1-1

Which of the following is a chemical change?

• Salt is dissolved in water.
• Water is boiled on a stove.
• Gasoline combusts in an engine.
• Copper metal is stretched into a long wire.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

To Solve for the volume occupied by 51.0 g of ammonia (NH₃) gas at STP, which equation is correct?

• A
• B
• C
• D

A bottle of chemical Q spills on the floor. According to the MSDS, what is the proper response to this accident?

• Letting the chemical evaporate by blowing fans on the spill
• Diluting the chemical with water, absorbing the liquid with inert material, and disposing of it in the trash
• Wiping up the chemical using paper towels and disposing of them in the trash
• Absorbing the chemical with inert material and disposing of it in a chemical waste container

If the temperature changes from point M to point N, at constant pressure, compound X undergoes —

• one phase change 
• two phase changes 
• three phase changes
• no phase changes