element x is a neutral element and has 39 protons. what element is it and how many electrons does it have? (use the periodic table)

In the molecular orbital model of benzene, the six p atomic orbitals combine to form how many molecular orbitals?

What can elements be classified as?

A solid has a volume of 64 cm3. Its mass is 288 g. What is its density?

If 25 mol of C8H18 are available, how many mol of CO2 can be produced

When writing the shorthand notation for sulfur, S, which element would you put in brackets?

Which of the four solutions is the best buffer against addition of acid or base? a. na2hpo4 b. na2hpo4 + nah2po4 c. nah2po4 d. h2o submit for grading save and finish later?

When electricity flows through a wire which of the following appears? Question 6 options: Gravitational Field Magnetic Field

Which of the following statements are correct about the chemical reaction? H2 + O2 - > H2O2 versus 2 H2 + O2 - > 2 H2O? They are both balanced chemical equations. The two reactions are equivalent. The laws of thermodynamics apply to both.

Explain how you would convert the moles of a compound to the made (grams) of the same compound

Which is the best definition of activation energy? O the energy required to end a chemical reaction O the energy required to bind a substrate to an active site O the energy required to form or break the bonds of reactant molecules O the energy