9.

The atomic number of an element is the total number of which particles in the nucleus?

a. electrons

protons and electrons

neutrons

d. protons

Which best describes a benefit of using laser instead of traditional cutting machines?

Without doing any calculations, arrange the elements in CF2Cl2 in order of decreasing mass percent composition. Rank from highest percent to lowest. a. C > F > Cl b. F C c. Cl > C > F d. Cl > F > C

Why does refrigerated food stay fresh longer than food that is kept at room temperature

Methane (CH4), ammonia (NH3), and oxygen can react to form hydrogen cyanide (HCN) and water according to this equation: 2CH4 + 2NH3 + 3O2 - - > 2HCN + 6H2O How many grams of oxygen are required to produce 1 mole of H2O? A. 24 grams B. 16 grams C.

Wich is not a characteristic common to all minerals

What element has 8 valence electrons

Which of the following best describes a metal? Brittle, shiny, and solid Brittle, dull, and low density Malleable, shiny, and able to conduct heat or electricity Malleable, dull, and solid, liquid, or gas at room temperature?

Which of the following errors could cause your percent yield to be falsely high, or even over 100%? Select ALL that apply. A.) Heating the sample too vigorously. B.) Handling the crucible directly with your hands. C.

If 56.8 ml of bacl2 solution is needed to precipitate all the sulfate ion in a 554 mg sample of na2so4 (forming baso4), what is the molarity of the solution?

is the number of total atoms on the left side of a balanced equation always equal to the number of total atoms on the right side of the equation?