How many neutrons are in an atom with the atomic number of 15 and an atomic mass number of 34?

? 19

? 15

? 34

Zainab is in science class, and he is studying an organism that reproduces sexually. The genetic material of the organism

A 4.000 g sample of an unknown metal, M, was completely burned in excess O2 to yield 0.02225 mol of the metal oxide, M2O3. What is the metal

What is a metalloid?

The molar mass of sucrose (C12H22O11) is 342.3 g/mol. A chemist has a 0.500-mol sample of sucrose. What is the mass, in grams, of this sample? a) 171 b) 342 c) 500 d) 684

15 grams of NaCl are added to a beaker. It is dissolved in 200 ml of water and diluted up to 250 ml. What is the Na + concentration in moles/liter in the final solution? (Atomic mass are Na = 22.99 g/mole, Cl=35.45 g/mol)

The electric force between two charged objects is 0.24 newtons. If the distance between them is increased by a factor of 4, what will be the new force? A. 0.015 newtons B. 0.03 newtons C. 0.06 newtons D. 0.12 newtons E. 0.36 newtons

Why do you need a balanced equation for stoichiometry?

The density of gold is 19.3 g/cm3. What is the volume of a 13 g gold nugget?

Glucose, C6H12O6, C6H12O6, is used as an energy source by the human body. The overall reaction in the body is described by the equation C6H12O6 (aq) 6O2 (g) ⟶6CO2 (g) 6H2O (l) C6H12O6 (aq) 6O2 (g) ⟶6CO2 (g) 6H2O (l) Calculate the number of grams of

Which two bases pair with each other?