The mass of a 50-mL volumetric flask is 40.638

g. After adding 15.0 mL of 95% ethanol and filling to the calibration mark with water, the flask weighed 88.219

g. What is the density of the mixture?

A rigid tank contains 2.4 kg of helium at determine the volume

Students wanted to test which acid was most effective at preventing hornworms from feeding on tomato plants. The students sprayed salicylic acid on one group of 15 tomato plants and jasmonic acid on a second group of 15 tomato plants.

Which of these is caused by a chemical change? a. the honey in a jar crystallizes and will no longer pour. b. the skin of a banana turns from green to yellow as it ripens. eliminate c. a box of powdered brown sugar turns into a solid brick over time.

Which of the following gives the correct possible values of / for n = 4? O 0, 1, 2, 3 -4, - 3, - 2,-1,0, 1, 2, 3, 4 O 0, 1, 2, 3, 4

Explain why is there no chemical equation to describe what happens when water evaporates?

In a closed system, if a gas is transported to a container with double the volume of the previous container, gas was held in, What is the gases' new volume?

Rebekah is studying a molecule and trying to determine if it is DNA or RNA. Which kind of molecule is she studying? carbohydrate protein nucleic acid lipid

The function of most proteins depends primarily on the

Compare the temperature of water as ice begins to form with the temperature of ice as it begins to melt?

Which elements are present in sugars?