Why do sunflowers bloom only in the summer

Which of the following describes the conversation of chemical energy to heat energy? a: a chair sitting still b: a leaf absorbing sunlight c: a battery powering a cell phone d: a rock hitting the ground

Determine the number of moles of gas in 45.0 liters of oxygen at STP. a) 1.61 moles b) 2.01 moles c) 22.5 moles d) 45.0 moles

A container has a total pressure of 1439 mmHg. There are 3 gases in this container, one has a pressure of 523.3 mm Hg, and another has a pressure of 509.8 mm Hg. What is the pressure of the 3rd gas?

At 50.14k a substance has a vapor pressure of 258.9 torr. calculate its heat of vaporization in kj/mol if it has a vapor pressure of 277.5 torr at 161.2k

A laboratory student adds 75.0 mL of 8.0 M HCl to enough water to form 500.0 mL of dilute solution. What is the final concentration of the dilute solution?

For each solute, identify the better solvent: water or carbon tetrachloride

If an element has 43 electrons, 56 neutrons, and 43 protons, what is its approximate atomic mass?

What did the Cherokee do to assimilate? Check all that apply They invented a writing system. They resisted white settlement. They wrote a constitution. They planted cotton and farmed.

Which of the following correctly compares the radii of Cl and Cl-? Cl has a larger radius than Cl - because Cl has an additional energy shell. Cl has a smaller radius than Cl - because Cl has an expanded electron cloud.

When a stretched string is vibrated up and down with a particular frequency, it causes a standing wave to be produced.