Which of the following is an example of a double-replacement reaction? A. 3K + AlCl3à 3KCl + Al B. KOH + HBr à KBr + H2O C. CH4 + 2O2à CO2 + 2H2O D. Cu + 2H2SO4à CuSO4 + SO2 + 2H2O

Maria is researching a family of elements for her high school chemistry class. She is using her text book for information about the chemical family.

What5 mass of water at 100c can be vaporized by the addition of 45 kcal of heat?

4) (5 pts) Give the formal charge of Sulfur in each of the following S Na2S SO SO-2

An element that is malleable and a good condcutor of heat and electricity could habe an atomic number of

1. An example of a pair of alleles is:

The burning of wood in a fireplace generates heat and light in the form of flames. Which of the following terms best describes this type of reaction? a. condensation reaction b. exergonic reaction c. endergonic reaction d.

How are the number of protons and the number of neutrons related?

If a sample of copper with a density of 8.90 g/cm3 displaces 13.0 mL of water when placed in a beaker, what is its mass? a 1.46 g b. 0.685 g c. 116 g

Which statement accurately describes the origin and expansion of the universe

Conversion. 5 km to inches