The sum of the protons and neutrons in an atom is called the atomic number

True or False

A 2.50 L solution contains 5.00 g of NaOH, which has a molecular weight of 40.00 mol What is the molar concentration of sodium hydroxide in the solution?

Which change in the temperature of a 1-gram sample of water wouldcause the greatest increase in the average kinetic energy of its molecules? (1) 1°C to 10°C (3) 50°C to 60°C (2) 10°C to 1°C (4) 60°C to 50°C

What is the difference between the electron shells, the subshells, and the orbitals?

In the following chemical reaction, which element is shown to be violating the law of conservation of mass? C3H8 + 4O2 - > 3CO2 + 4H2O A. C B. H C. O D. none of the above; the equation is balanced.

Which best explains why greg's hands get warm as he holds a bowl of hot soup? heat energy is created from the thermal energy in greg's hands. heat energy is absorbed by the soup from greg's hands. thermal energy from the soup moves to greg's hands.

What is a property of a combustion reaction? A. Oxygen gas, O2, is a reactant. B. The products are simpler than the reactants. C. The reactants are simpler than the products. D. An uncombined element is on the reactant and product side.

For an endothermic reaction at equilibrium, the addition of a catalyst Group of answer choices causes no shift causes a shift to the right causes a shift to the left makes it an exothermic process

The atomic number of an element best corresponds to which of the following? O The mass of an atom of that element. O The number of electrons orbiting the nucleus of an atom of that element.

If a dinosaur once lived in mexico, and i now live in arkansas, can i be drinking the same water the dinosaur did?

Dough to which potassium bromate has been added rises better, producing a lighter, larger volume loaf.