Calculate the molarity of a 15g NaCl in 250mL of solution

What 4 elements did people originally think made up everything?

Compare and contrast mass and weight. How are they similar? How are they different?

If Hershey and Chase had used radioactive oxygen in their experiments instead of phosphorus and sulfur, what results would they have likely obtained? a. They would have observed a radioactive signal in both the pellet and the liquid. b.

What is the mass of a cube of aluminum that is 4.0 cm on each edge? The density of aluminum is 2.7 g/cm3.

Suppose an error in transcription causes threonine (Thr) to be incorporated into the variable region of an antibody instead of arginine (Arg). Which of these could describe the error ACG was transcribed instead of AGC.

Which describes the polarity in a water molecule? a). partial negative charge on the oxygen atom because its electrons are pulled toward the hydrogen atoms b).

To what temperature in kelvin will a 2.3 L balloon have to be heated to expand to a volume of 400 L Assume the initial temperature of the balloon is 25 degrees celsius.

In which changes of state do atoms lose energy?

Can you live without body tissue? This is a yes or no question, no explaining required, but you can add it if you want. : D

According to the graph, which activity has used the largest amount of water over the past twenty years?