If 25% of a radioactive element remains after 1,000 years, what is the half-life?

A metal sample is heated and placed into the water in a calorimeter at room temperature. Which statement best describes how the calorimeter can be used to determine the specific heat capacity of the metal sample?

Which type of reaction is Mg + O2 → Mgol

What knowledge is radiometric dating based upon? A. the rate of decay for certain isotopes B. the name of the rocks C. the weight of the samples D. the sequence of layers in the rocks

The asteroid belt separates what? A. sun and the stars B. Earth and moon C. inner and outer planets D. Milky way from other galaxies

Of the molecules pf3 and pcl3, which has bonds that are more polar? hints

What is it called when the state of matter that keeps its shape and volume when it's placed in a different container

A 0.1 m solution of which salt is the most basic? (a) nano3 (b) naclo4 (c) nahso4 (d) nahco

How to conduct electricity with light bulb and battery

A cup can hold 50 ml of water and has a mass of 25g. If each penny weighs 2g, how many pennies can it hold before it sinks in fresh water? Explain how you got your answer.

How many moles of FeO are produced if 8 moles of CuFeS, are consumed?