Which of the following statements describe the physical properties of a penny?

A) It is smooth and shiny

B) It is light and thin

C) It turns brown in water

D) It gets hot in the sun

There may be more than one answer

One of the main contaminants of a nuclear accident, such as that at Chernobyl, is strontium-90, which decays exponentially at an annual rate of approximately 2.7% per year. a.

How many moles of ammonia are produced when 5.0 moles of hydrogen react with excess nitrogen? Use this balanced equation for the Haber process: N2 (g) + 3 H2 (g) → 2 NH3

What mass of potassium iodide is needed to prepare 5.60 L of a 1.13 M solution

Ice floats on water. For most other substances, however, the solid sinks in the liquid. Classify each of these statements as true for water, or true for most other substances. A) High pressure will cause the solid to become liquid.

What happens to the conductivity of water when a base is dissolved in it

Explain why ships traveling from east to west across the Atlantic take days longer than ships traveling the same distance from west to east.

In a titration 25.0 ml of a. 20 M NaOH solution is used to neutralize 10.0 ml of HCl. Write the equation for this neutralization reaction and calculate the molarity of the acid.

4*C: 4cm 8*C: 10cm 12*C: 14cm 16*C: 18cm 20*C:24cm 24*C: 12cm what is the independent variable, dependent variable and three constant variables?

In the chemical laboratory, why do scientists use a mortar and pestle? a. to increase surface area of a solute b. to decrease surface area of a solute c. to increase temperature of a solute d. to decrease temperature of a solute

Is a mixture being separated into two elements a chemical change