Judy wanted to figure out the mass of her backpack. She put the pack on a

balance and added 3, 6, and 4 kg weights so that the balance was even. What

is the mass of her backpack?

A) 5kg

B) 9kg

C) 10kg

D) 13kg

The Pamlico Sound is ecologically important to the coast of North Carolina because it allows for biological diversity, controls erosion, reduces flooding and A. provides waterways for kayaking. B. has shallow water which reduce drowning. C.

Across a period, how does the electronegativity of a nonmetal affect the acidity of its binary hydride

A balloon containing 0.500 mol Ar at 0.00°C and 65.0 kPa pressure is expanded by adding more argon. How many moles of argon are added to bring the sample to a final volume of 60.0 L at 30.0°C and 45.0 kPa? What is the original volume of the gas?

The greater the molality of solute, the less (easily) a solution evaporates. Question 7 options: True False

Consider this reaction 2Mg (s) + O2 (g) - --> 2MgO (s) What volume (in milliners) of gas is required to react with 4.03 g Mg at STP? A) 1860 mL B) 2880 mL C) 3710 mL D) 45,100 mL

Sound waves travel fastest through? A.) Air B.) Steel C.) Water D.) Vacuum

Which of the following combinations will result in a reaction that is never spontaneous? 1) positive enthalpy change and positive entropy change 2) positive enthalpy change and negative entropy change 3) negative enthalpy change and positive entropy

Which of the formed elements is present in the greatest concentration?

A compound has a percent composition of 24.74% potassium (molar mass = 39.10 g/mol), 34.76% manganese (molar mass = 54.94 g/mol), and 40.50% oxygen (molar mass = 16.00 g/mol).

What would be the saturation concentration (mole/L) of oxygen (O2) in a river in winter when the air temperature is 0°C if the Henry's law constant at this temperature is 2.28 * 10-3 mole/L-atm? What would the answer be in units of mg/L?