6th Six Weeks Review Part 1

Galactose is a sugar found in honey with the molecular formula of C₆H₁₂O₆ . Which of the following could represent the empirical formula for Galactose?

• CHO

• C₂H₂O₂

• C₂H₄O

• CH₂O

Tags

NGSS.HS-LS1-6

How many Ca atoms are found in 1.00 mole of CaO?

• 3.01 x 10²⁶

• 6.02 x 10²³

• 1.20 x 10²⁴

• 6.02 x 10²⁷

A molecule of sucrose is comprised of 12 atoms of carbon, 22 atoms of hydrogen, and 11 atoms of oxygen. What is the molar mass of sucrose?

• 344.32 g/mol

• 324.34g/mol

• 342.34 g/mol

• 334.42 g/mol

Tags

NGSS.HS-LS1-6

I have provided an example of how to solve for percent composition.

Use the steps in the image to help you answer that following question.

The molecular formula for caffeine is C₈H₁₀N₄O₂. Determine the percent composition for each element in the compound.

• 50 % C, 5% H, 29% N, 16% O

• 60 % C, 14% H,

  20% N, 6% O

• 56 % C, 15% H, 19% N, 10% O

• 55 % C, 9% H, 23% N, 13% O

Ethane is natural gas containing both carbon and hydrogen. Which type of reaction occurs when ethane reacts with oxygen gas to produce carbon dioxide, water, and energy?

• Synthesis

• Double replacement

• Single replacement

• Combustion

Neurons in the brain rely on the active transport of sodium and potassium ions across their cell membranes to generate electrical impulses. Blood, which is about 83% water, transports these ions to the brain. The property of water that facilitates the dissolution and movement of these charged ions, enabling their transport to brain cells, is its –

• Molecular mass

• Specific heat

• Polarity

• Density

What is the molarity of 8.45 mole of sodium carbonate in 2.36 L of solution?

• 3.58 M

• 0.28 M

• 3.85

• 0.82

The stronger the bases have-

• A higher concentration of hydroxide ions

• A lower pH

• A higher concentration of hydronium ions

• A stronger bond

The stronger the acid-

• The stronger the acid, the lower the pH.
• The stronger the acid, the more hydrogen ions present.

• The stronger the acid, the more basic the solution.
• The stronger the acid, the higher the pH.

The graph shows a solubility curve for ammonia gas and solubility measurements taken at different temperatures.

Match the Letter with the correct solubility label.

• Unsaturated

• X

• Supersaturated

• Y

• Saturated

• V

• Saturated

• W

Tags

NGSS.HS-PS1-5