Which of a following elements is always a component of an organic compound

What are three ways that minerals can be identified

What is the ph of a 2.6*10^-9 m H + solution

A 5.5 g sample of a substance contains only carbon and oxygen. Carbon makes up 35% of the mass of the substance. The rest is made of oxygen. You are asked to determine the mass of oxygen in the sample.

Calculate the mass in grams of 202 atoms of iron

Find the molar mass of 30Si if the average molar mass of Si is 28.09 g/mol? Silicon has three naturally occurring isotopes (28Si, 29Si, and 30Si). The molar mass and natural abundance of 28Si are 27.98 g/mol and 92.

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?