Which of the following are indicators of a chemical change? Select all that apply. color change temperature change precipitate formation gas formation cutting a solid into smaller pieces

Felicity and Dawson are conducting an investigation to determine the empirical formula of iron oxide. They start with an 85.65g piece of iron metal and burn it in the air. The mass of the iron oxide produced is 118.37.

What kind of solid has a regular repeating arrangement of atoms A: a crysalline solid B: a amorphous solid C: a rubbery solid D: a glassy solid

You recently discovered a new element, and find that this particular element has one electron in its outer energy level. what would you expect will happen to an atom of this element if placed in water?

What mass is 2.4E25 molecules of NaHCO3?

For a chemical reaction to be spontaneous at all temperatures, which of the following conditions must be met? a. ΔS° > 0, ΔH° > 0 b. ΔS° > 0, ΔH° < 0 c. ΔS° < 0, ΔH° < 0 d. ΔS° 0 e.

Consider the reaction: 8H2S (g) + 4O2 (g) →8H2O (g) + S8 (g). Δ[H2S]/Δt = - 0.033M/s. Find Δ[O2]/Δt. Δ[H2O]/Δt. Δ[S8]/Δt. Find the rate of the reaction.

At room temperature and pressure what is the volume of one mole of oxygen?

Ibuprofen, a common pain remedy, has an empirical formula of C7H9O and a molar mass of approximately 218.078 grams per mole. What is the molecular formula of ibuprofen?

Copper (cu) is a transition element used in the making of coins. calculate the mass in grams of 0.0420

In 1864, the Solvay process was developed to make soda ash. One step in the process is represented by the balanced equation below.