A sample contains 430 mg of mercury. How many significant figures are in the number?

Sea water, a solution composed of a variety of salts dissolved in water. the salt is the

Element A has an electronegativity of 0.8 and element B has an electronegativity of 3.0. Which statement best describes the bonding in A3B? A) The AB bond is largely covalent with a on A. B) The AB bond is largely covalent with a δ + on A.

Warm air lifted up and over a moving cold air mass will produce a what

A sample of water is being heated over a flame. What happens to the water as it is heated? Select one: a. The volume of the water decreases. b. The water undergoes an endothermic reaction. c. The kinetic energy of the water molecules increases. d.

When an experimenter draws a conclusion that he assumes will apply to all situations set up similarly to his test situation, even though he cannot possibly have examined all possible test scenarios, the experimenter is using what kind of reasoning?

What two forces cause the arc-shape of projectile motion?

Why are some mystery elements easier to identify than others?

Which of the following processes is exothermic (heat or energy is released) ? A) ice melting in a beverage B) dry ice (solid CO2) converting to a gas at room temperature C) evaporation of water from a mud puddle D) burning propane in a barbeque

What is one way to increase the dissolution rate of a sugar cube? a) crush the sugar cube into smaller pieces b) add more sugar cubes to the solvent c) increase the pressure on the solution d) decrease the temperature of the solution

Vitamin A is a very large organic molecule composed of twenty atoms of carbon, one atom of oxygen and thirty atoms of hydrogen. How many atoms total are in TWO molecules of vitamin A. Select one: 84 68 34 102