a radioactive substance has a half-life of 10 years. if you start with 30 grams of the substance, how much will remain after 30 years.

In order for substances to conduct electricity their ions must be

What is the difference between mass number and atomic mass (sometimes also called atomic weight) ? Boron has an atomic mass of 10.811. What does this mean?

How many moles of solute particles are present in 100.0 ml of 2.50 m (nh4) 3po4?

The time of the revival of learning in areas such as the Bible, art, and true science is called the:

Particles in a plasma experience collisions than particles in a solid. Based on their state of matter alone, is it easier to speak of the shape of the Sun or the Moon? Two unknown substances are in identical beakers.

A chemical reaction involves the rearrangement of atoms to form new molecules. During a chemical reaction, however, atoms are neither created nor destroyed. Which of the following is true about the atoms involved in a chemical reaction? A.

What is the new concentration, after diluting 300 mL of a 1.5 M LiCl solution to 1L

The answer that he gave was wrong

In which orbital does an electron in a bromine atom experience the smallest?

What characteristics of water allow it to have high surface tension?