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

How can we determine which compound was present in a container labelled KNO3 or K2CO3 or KNO2?

What is the difference between an ionic bond and an covalent bond? A) An ionic bond is a bond between charged atoms, while covalent is a bond between neutral atoms.

12.0 moles of gas are in a 6.00 L tank at 23.4 ∘C. Calculate the difference in pressure between methane and an ideal gas under these conditions. The van der Waals constants for methane are a=2.300L2⋅atm/mol2 and b=0.0430 L/mol.

He isotope 62 (over28ni has the largest binding energy per nucleon of any isotope. calculate this value from the atomic mass of nickel-62 (61.928345 amu.

A solution that contains only a low concentration of solution.

Car Q and z are put though an endurance test to see if they can travel at 120 km/h for 5.0 hours. Each car has a 45-L fuel tank. Car z must stop to refuel after traveling for 4.2 hours. Car Q, however, travels for 5.4 hours before running out of gas.

What happened to the atoms in the heated metal ball so that it didn't fit through the ring?

A 3.00 L flexible container holds a sample of hydrogen gas at 153 kPa. If the pressure increases to 203 kPa and the temperature remains constant, what will the volume be?

Measurement of the functions of a nephron reveals a glomerular capillary pressure of 69 mm Hg, and a pressure in the capsular space of 15 mm Hg.

Water is unique because the density of it's solid is less than the density of it's liquid. Describe how life would be different if this weren't true