Which of the following items represents a chemical change? burning melting evaporation freezing

The physical properties of a compound are similar to those of its elements.

a. True

b. False

What will happen if blue litmus paper is placed in a solution of HCL? What does the change indicate about the HCL solution?

Identify the oxidation of Pin HPO 2-4

Many metals react with acids to produce hydrogen gas. A certain reaction produces 32.6 L of hydrogen gas at STP. How many moles of hydrogen were produced?

The conjugate acid of a particular halide has a pka = 3. a student wants to use this halide in a substitution reaction thinking it will have a good leaving group. can this student use this halide in a substitution reaction?

Classify the six underline properties in the following paragraph as chemical or physical: Fluorine is a pale yellow gas that reacts with most substances. The free element melts at - 220 centigrade and boils at - 188 centigrade.

How many moles of oxygen react with 0.23 moles of NH3

How many moles of carbon do you have in 100 quadrillion carbon atoms? report answer to 2 sig figs

A small 15 kilogram canoe is floating downriver at a speed of 4 m/s. What is the canoe's kinetic energy?

Liquid water is heated until it boils and becomes water gas. Which statement is true about the water?

You are conducting an experiment on plant growth. You take a plant fresh from the soil that weighs 5 kilograms (kg). Then you dry the plant overnight and determine the dry weight to be 1 kg.