Calculate the percentage by mass of oxygen in (nh4) 2co3

Give two examples of amphibians. describe one similarity and difference between amphibians and fish

What is another name for the representives elements?

An aspirin tablet contains 325.0 mg of aspirin, which has the molecular formula, C9H8O4. How many molecules of aspirin are in the tablet?

A compound differs from a mixture in that a compound -Contains only one element - Varies in chemical composition depending on the sample size - has a definite composition by the elements that the compound contains - Can be classified as either

Sound waves entering the ear first strike the. hammer, anvil, eardrum, cochlea

A living thing that cannot make its own food and must eat other living things for energy

Which best explains why astronauts appear weightless when they are in a space shuttle orbiting Earth? • They are falling toward Earth at the same rate as the space shuttle.

If increase the amplitude how does the velocity change? (No google)

What is the result of multiplying (2.5 * 1010) * (3.5 * 10-7) ? Use the correct number of significant digits.

What is 0.002353 to two significant figures