What is the mass number of oxygen atom with 7 neutrons?

Which if the following is true about scientific theory? a. A theory is a proposed explanation for a hypothesis b. A theory can be formed after a single experiment c. A theory can be changed to explain new observations or experimental results d.

Which of the following types of energy does an object have because of its motion? Chemical energy Gravitational energy Kinetic energy Potential energy

How is firelight produced

How many grams of copper (II) fluoride are needed to make 6.7 L of a 1.2 M solution?

How many grams are in 1.11 moles of MN3 (SO4) 7

Which statement regarding water is true? Energy must be given off in order to break down the crystal lattice of ice to a liquid. Hydrogen bonds are stronger than covalent bonds. Liquid water is less dense than solid water.

Which of the following elements has the fewest valence electrons?. a. beryllium. b. boron. c. carbon. d. lithium

How many molecules are in 4.50 moles of H2O? A. 450 molecules B. 6.02 x 1023 molecules C. 2.71 x 1024 molecules D. 3.00 molecules

A sample of pure calcium fluoride with a mass of 15.0 g contains 7.70 g of calcium. How much calcium is contained in 45.0 g of calcium fluoride

If the mass of a material is 111 grams and the volume of the material is 11 cm3, what would the density of the material be?