where are the first repost of new scientific discoveries published A.) Internet Sites B.) Magazines C.) encyclopedias D.) Scientific journals

Observe the reactions given below. Classify the reactants based on whether they are oxidized or reduced. Zn (s) + Cu2 + (aq) →Zn2 + (aq) + Cu (s) 3Fe (s) + 4H2O (g) →Fe2O3 (s) + 4H2 (g) Drag the appropriate items to their respective bins.

For a pressure of 1.00 atm and a temperature of 24.0 ∘C, use the ideal-gas law to estimate the number of air molecules in the room. Assume all the air is N2. Express your answer to three significant figures and include the appropriate units

Which of the following would increase the rate of a chemical reaction between hydrochloric acid (HCl) and solid zinc metal (Zn) ? A. Decreasing the amount of Zn B. Performing the reaction at a lower temperature C.

What is the empirical formula of a compound that is 14 g calcium, 11g oxygen, and 0.7 g hydrogen

A 5 grams sample of liquid water evaporates into gaseous water in a closed container, expanding in the process. What is the mass after evaporation?

Liquid water is heated until it boils and becomes water gas. Which statement is true about the water?

You are conducting an experiment on plant growth. You take a plant fresh from the soil that weighs 5 kilograms (kg). Then you dry the plant overnight and determine the dry weight to be 1 kg.

What is the ratio of Fe+3 ions to O2 - ions in a neutral compound? a. 1:2 b. 2:1 c. 2:3 d. 3:2

What is the specific heat capacity of a 17.5g sample of an unknown metal that releases 6700J of heat when it cools from 90 to 25 degrees C?

How can equilibrium of a closed system chemical reaction be disturbed? Select all that apply. Adding or removing products or reactants. Keeping the concentration of products and reactants the same. Keeping the temperature of the system constant.