The basic unit of structure and function in all living things is the

nucleus.

atom.

cell.

organelle.

Calculate the mass percent of calcium in Ca (OH) 2?

Mixtures are two or more substances that are not chemically combined. Which of the following statements is true about the mixture? Cranberry juice is a homogeneous mixture.

What is the difference between the nitrite ion and the nitrate ion?

Organic compounds are produced only by living systems, and cannot be synthesized in the laboratory true or false

A sample of a gas is contained in a closed rigid cylinder. According to kinetic molecular theory, what occurs when the gas inside the cylinder is heated? (1) The number of gas molecules increases.

Given the number of mols equal to 1.28 and the molarity equal to 3.4M, determine the number of liters of solution

How many moles are in 36 g of Beryllium (Be) ? a. 0.25 mol b. 4.0 mol c. 45.0 mol d. 320 mol

Under which conditions can an eclipse occur? sun blocks Earth moon blocks the sun moon blocks Earth sun blocks the moon

In DNA, what base pairs with cytosine? A. adenine B. cytosine C. guanine D. thymine

What do astronomers use to calculate the age of the universe? Check all that apply. dark energy the age of rocks on Earth the age of the oldest stars patterns of background radiation how fast distant galaxies are moving away from us