Uranium-232 has a half-life of 68.8 years. After 344.0 years, how much uranium-232 will remain from a 100.0-g sample?

1.56 g

3.13 g

5.00 g

20.0 g

Is it true that a compound is different from the elements that reacted to from it?

How does Velocity differ from Speed? (Velocity-Mesure of both speed and direction)

What happens in a chemical reaction? a. Atoms are destroyed. c. Molecules are created. b. Atoms are created. d. Atoms are rearranged.

The molecular mass of methyl ethanoate is 75.1 amu. calculate the molecular mass of propanoic acid, an isomer of methyl ethanoate. express your answer with the appropriate units.

What lever has resistance between the axis (fulcrum) and the force (effort) ? A. first B. second C. third D. fourth

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

10. Is the identity of an element determined by its mass number or atomic number? By omak