Which of the following is a radioisotope used to date rock formations older than 50,000 years?

a. Carbon-14.

b. Uranium-235.

c. Cobalt-69.

d. Carbon-12.

To identify a diatomic gas (X2), a researcher carried out the following experiment: She weighed an empty 2.2-L bulb, then filled it with the gas at 2.00 atm and 27.0 ∘C and weighed it again. The difference in mass was 5.1 g. Identify the gas.

Warm-Up A 206-gram bar of iron has sunlight shining on it. Initially, its temperature is 24.7°C. As it gains 1,070.79 joules of energy, its temperature rises to 36.2°C. Calculate the specific heat capacity of the iron bar using the formula Q = mCAT.

When would you have the most potential energy?

The molecular formula mass of this compound is 120 amu. What are the subscripts in the actual molecular formula? Enter the subscripts for C, H, and O

If amino acids could be produced by random chemical processes

Why do scientists say that this technology will not harm fish in the area?

What is the primary cause of global wind patterns on earth?

What is the central argument about global warming

How many mL of a 4.50M NaBr solution are needed to make 250 mL of a 0.75M solution of NaBr?

Calculate the density of propanol c3h8o if you know that there are 1.069*1025 molecules of propanol in 1.35 l.