Is the Zeff of an element always equal to the number of valence electrons?

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?