Which of the following affects the rate of a chemical reaction?

a. the presence of a catalyst

b. the temperature

c. the concentration of reactants

d. all of the above

In a chemical reaction, the products are A. the substances that are broken apart or combined in the reaction. OB. the number of atoms of each chemical present in the reaction. C. all of the chemical formulas that are used during the reaction.

Is HBr a polar compound? Why or why not?

A lamp releases only light and thermal energy. The energy input of the lamp is 120 watts. Of that input, 80 watts is converted to light. How much energy is converted to thermal energy?

Have a region surrounding the central area called

A chemical dye whose color is affect by acidic and basic solution

How many moles of lithium are in 83 grams of lithium?

Ocean constitutes most of ___ of water a) Evaporation b) Precipitation c) Condensation d) Transpiration e) Sublimation Don't choose a random letter.

In the reaction, Zn + HCl-> ZnCl2 + H2, 25 grams Zn are reacted with 17.5 grams HCl. How many grams of H2 will be produced? A. 0.382 g of H2 B. 0.479 g of H2 C. 0.7865 g of H2 D. 0.484 g of H2

Is nail varnish soluble?

What is the periodic trend for atomic size from top and bottom in a group? From left to right in a period?