An element X has two isotopes. X-15 has 7 protons and 8 neutrons. Determine the atomic number and mass number of the second isotope, which has 10 neutrons in its nucleus ... How would I do this and get the answer?

What is true of a sample of gas particles as the temperature decreases A. The particles move faster and their average kinetic energy decreases B. Particles move faster and their average kinetic energy increases C.

At what temperature Kelvin would 4.00 mol H2 in a 100 L container exert a pressure of 1.00 atm?

Determine the total mass of ethanol produced when 270 g of glucose reacts completely to form ethanol and 132 g of carbon dioxide

Which is a characteristic of aromatic hydrocarbons? A. They have triple bonds B. They are cyclic C. They are saturated D. They are in straight lines.

What is the best way to compare a concentrated solution to a dilute solution, given the same volume of solution? The concentrated solution has less solute than the dilute solution.

What is the difference between a distraction and a reaction

if carbon which has an electrongavity of 2.5 bonds with hydrogen, which has an electrongavity of 2.1, the bond between the two atoms will be classified as a (n) covalent bond

If a chemical reaction such as photosynthesis begins with 6 atoms of carbon (C), how many atoms of carbon (C) should be in the products? A. 12 atoms of carbon (C) B. 6 atoms of carbon (C) C. 3 atoms of carbon (C) D. 2 atoms of carbon (C)

Car Q and z are put though an endurance test to see if they can travel at 120 km/h for 5.0 hours. Each car has a 45-L fuel tank. Car z must stop to refuel after traveling for 4.2 hours. Car Q, however, travels for 5.4 hours before running out of gas.

What happened to the atoms in the heated metal ball so that it didn't fit through the ring?