How many atoms are included in a 12 gram sample of carbon 12

Which of the following is true about two neutral atoms of the element gold? The nucleus is missing in both. Each has a different mass. Both have the same properties. Each has a different number of electrons.

How many grams of XeF6 are required to react with 0.579 L of hydrogen gas at 4.46 atm and 45°C in the reaction shown below? XeF6 (s) + 3 H2 (g) - -> Xe (g) + 6 HF (g)

Why did oceans not exist on Earth nearly 4 billion years ago? a. No water molecules were present. b. Water remained a gas because Earth was very hot. c. Water existed as ice because Earth was very cold. d. There was no oxygen gas in the atmosphere.

In which of these situations would light slow down? A. from plastic to air B. from ice to water C. from a vacuum to air D. from glass to air

Observations that deal with descriptions that cannot be expressed in numbers are called a. manipulated observations. c. qualitative observations. b. quantitative observations. d. operational observations.

Which of the following correctly compares the radii of Cl and Cl-? Cl has a larger radius than Cl - because Cl has an additional energy shell. Cl has a smaller radius than Cl - because Cl has an expanded electron cloud.

When a stretched string is vibrated up and down with a particular frequency, it causes a standing wave to be produced.

Find the concentration of a solution with 30 grams of solute in 250 grams of solution.

What unit is used to measure cell potential? A. electron Kelvin oxidation number OD. volt

What term is used to describe a testable modle