Chemistry

It is okay to heat items and chemicals in a closed container. True False

When a concentrated base spills on your labcoat.you should [Select] square and then square

((0.86frac (g)/(mL))((1mL)/(10^-3)L))((54.99(g)/(mol)))=?square

14. Geochemistry is the study of the chemical reactions that take place in the body. True False

4. Salt and sugar are poured into a glass of water and stirred. Slowly, the salt and sugar crystals become harder to see and then cannot be seen at all. What happened to the salt and sugar? Was a pure substance or mixture formed? square How do you know it was a pure substance or mixture?

Multiple Choice Question A covalent bond involves which of these interactions? Loss of electrons from several atoms Transfer of electrons between atoms Sharing of electrons between atoms

Completely classify jet fuel (Select all that apply) Compound Mixture Element Homogeneous Mixture Pure Substance Heterogeneous Mixture

Multiple Choice 0.5 points An atom's outermost electron shell determines its atomic mass. is filled when it has three electrons. is filled with positively charged particles. is filled identically for every element. determines its chemical reactivity.

At a particular temperature, the equilibrium constant for the reaction below is K_(c)=4.01 H_(2)(g)+Cl_(2)(g)leftharpoons 2HCl(g) What is the equilibrium constant for the following reaction? 4HCl(g)leftharpoons 2H_(2)(g)+2Cl_(2)(g) 5.66 0.125 16.1 0.0622 8.02

Use the following information to answer questions 5 and 6. Zinc metal reacts very quickly with hydrochloric acid to produce zinc chloride and hydrogen gas according to the equation: Zn+2HClarrow ZnCl_(2)+H_(2) If 1.25 moles of Zn reacts with 3.00 moles of HCl, what is the theoretical yield of H_(2) for the reaction? 0.6258 1.258 2.528 3.028