The burning of coal releases heat salt dissolving in water is physical change?

True

False

Determine by experiment whether each of the following pairs of liquids is miscible or immiscible. Acetone and water Acetone and hexane How can you explain these results, given that water and hexane are immiscible?

How are matter and substances related?

Find the number of moles of butane (c4h10) in 21g sample of butane gas

How many atoms are in 5.40mol of iron

Which of the following is a characteristic of durable scientific knowledge? A - It remains unchanged over time. B - It is rarely subjected to examination. C - Several scientists' investigations support it.

What is the biggest difference between an exothermic and endothermic process? A. The direction of energy flow. B. The amount of energy transferred. C. The type of energy being transferred. D. The speed with which energy is transferred.

The mass of 1 mol of chromium (atomic mass 51.996 amu) is

Which of the following elements will tend to form a cation? A. Oxygen B. Nitrogen C. Sulfur D. Lead E. All of the Above

Is pure orange juice a solution or a suspension

If a catalyst is used in a reaction: a. the energy of activation increases. b. the reaction rate does not change. c. the reaction rate increases. d. the equilibrium shifts.