Which is an example of a chemical reaction

Putting water into the freezer to make ice cubes

A water sample tested positive for lead with a concentration of 35 ppm. The density of the solution is 1.00 g/mL Which of the following statements is correct? A. 100 g of the solution contains 35 g of lead B. there are 35 mg of lead in 1.

When is a pie chart used

In a 1.0 * 10-6 M solution of Ba (OH) 2 (aq) at 25 °C, identify the relative molar amounts of these species.

How many grams of H20 is formed with 0.75 moles of NaOH

Part a by drawing molecular orbital diagrams for b2, c2, n2, o2, and f2, predict which of these homonuclear diatomic molecules are magnetic.

A student states that non-metal atoms share their core electrons when they form covalent bonds. What is wrong with this statement? A. Atoms do not share electrons during covalent bonding. B.

Boron has an average mass of 10.81. One isotope of boron has a mass of 10.012938 and a relative abundance of 19.80 percent. The other isotope has a relative abundance of 80.20 percent. What is the mass of the two isotopes?

What type of radiation is most likely to damage DNA? A. ionizing B. non-ionizing

Water vapor cools and comes together to form a cloud. This is an example of what change in state? condensation evaporation melting