Compare the data on the atomic radius graph for elements 3 through 10 with the data for elements 11

through 13.

a. How are they similar?

b. How are they different?

Which of the following chemical equations is balanced? a. Zn + HCI - - ZnCl2 + H2 b. 2 Zn + 2 HCI - ZnCl2 + H, c. 2 Zn + HCI - ZnCl2 + H2 d. Zn + 2 HCI - ZnCl2 + H2

State three reasons why do you think air is a mixture and water a compount?

When 24g of magnesium metal is heated in air, 40g of magnesium oxide is produced. What mass of magnesium would be needed in order to produce 10g of magnesium oxide?

You are taking a road trip and your car gets 25 miles to the gallon. It has a gas tank which holds 14 gallons of gas. If this is the case, how many times will you have to fill up the tank if your trip distance is 250 miles?

In 1808, John Dalton proposed a series of statements regarding the atom that became known as Dalton's postulates or Dalton's atomic theory. Since Dalton's original proposal, some of the statements have been updated or changed due to new discoveries.

5. How are compounds different from mixtures?

Which statement about the density of warm water is most likely correct? Warm water is more dense than cold water. Warm water is less dense than cold water. The density is the same for warm and cold water.

Sodium ions are used by your body every time you move a muscle. The difference between the Na + ions and atomic Na is that A) ionic sodium has one more electron. B) atomic sodium has one more electron. C) atomic sodium has one fewer electron.

In which equation does the term "heat" represent heat of fusion? (1) NaCl (s) + heat - - >NaCl (l) (2) NaOH (aq) + HCl (aq) - - >NaCl (aq) + H2O (l) + heat (3) H2O (l) + heat - - > H2O (g) (4) H2O (l) + HCl (g) - - >H3O + (aq) + Cl - (aq) + heat

What is the pH of a 5.4 x 10-3 M HCl solution? A. 2.3 B. 3.3 C. 3.7 D. 11.7