How many ammonium ions and how many sulfate ions are present in an 0.250 mol sample of (nh42so4?

Explain and give a specific example of physical evidence that indicates that Earth's continents have moved over time.

What are the two sources or heat in earth's interior? A) radioactive decay and convection currents B) magma and liquid outer core C) sunlight and meteor impacts D) leftover heat from formation and radioactive decay

A scientist in California is making a substance consisting of the element lithium and the element chlorine. She found that lithium combines with chlorine in a 2:1 mass ratio.

Correctly identify the generic formula for a double replacement reaction. a. AB + CD + AD + CB d. CxHy + O2 → CO2 + H2O b. AB + A+B e. AB + C → AC + B C. A + B → AB

The constant k for a certain reaction is measured at two different temperatures:Temperature K376.0°C 4.8x 10^8280.0°C 2.3 x 10^8Assuming the rate constant obeys the Arrhenius equation, calculate the activation energy E for this reaction.

How many grams of oxygen are formed when 8.20 moles of KOH are formed? 4 KO (s) + 2 H2O (l) → 4 KOH (s) + O2 (g)

It's Peggy Sue's birthday and she's about to blow out the candles on her cake. Brother Roger stops the party when he shouts: "Look at that! Chemical and physical changes taking places on your birthday cake!

When aluminum, Al, metal is dipped in an aqueous solution of hydrochloric acid, HCl, hydrogen gas, H2, is produced with the formation of an aluminum chloride, AlCl3, solution.

What are the advantages of using solar energy

Which of the following has the highest critical temperature? H2 N2 NH3 H2O