What is the estimated age of a tree with 6 dark rings and 6 light rings?

12 years old

3 years old

4 years old

6 years old

A marine aquarium is found to contain a salt concentration of 40 ppt. How many grams of salt are in one liter of the solution?

What is the automatic number of a sodium atom that has 11 protons and 12 neutrons

What is the difference between a renewable and nonrenewable resource

17. What mass of ethylene glycol, when mixed with 225 g H2O, will reduce the equilibrium vapor pressure of H2O from 1.00 atm to 0.800 atm at 100 °C? The molar masses of water and ethylene glycol are 18.02 g/mol and 62.07 g/mol, respectively.

A variable-ratio schedule will reward a subject after it displays a response enough times. on an irregular and non-conditional basis. on an irregular and conditional basis. after a certain length of time has passed.

Which statements accurately describe mass? Check all that apply.

What was the first particle discovered inside an atom

Calcium and sulfur ionic compound or non ionic?

Which of the following would release the most heat upon cooling from 75°C to 50°C?

Chlorine atoms each have 17 protons. How many neutrons does each Cl-37 atom have? A. 17 B. 20 C. 37 D. 54