Carbon dioxide subliming is an example of which of the following?

O A. Mass change

O B. Chemical change

O C. Nuclear change

O

D. Physical change

Which statement best describes why carbon can form a wide variety of organic compounds? 1) Each carbon atom ionically bonds with atoms of carbon, hydrogen, oxygen, and nitrogen.

Explain what a polar bond is and how the electronegativities of the two atoms in the bond compare.

A sample of gas is enclosed in a container of fixed volume. Identify which of the following statements are true. Check all that apply. If the container is heated, the gas particles will lose kinetic energy and temperature will increase.

How many electrons does a single hydrogen gain or lose in the following reaction? H 2 + O 2 → H 2 O A. Gain 2 B. Lose 1 C. Gain 1 D. No change

Why are the halogen elements so dangerous in their uncombined forms?

G oil of wintergreen, c8h8o3 is prepared when methanol, ch3oh, is reacted with salicylic acid, c7h6o3. what is the percent yield of a reaction in which 15.3 g of oil of wintergreen is collected after 16.

How can a neutral atom become a positively-charged particle?

Mineral oil can be used in place of mercury in manometers when small pressure changes are to be measured. What is the pressure of an oxygen sample in mm of mineral oil if its pressure is 28.5 mm Hg? (d of mineral oil = 0.88 g/mL; d of Hg = 13.

To identify an unfamiliar organism, you could use a field guide and an

What is the value of Kw at 25°C? 1.0 x 10-14 1.0 x 10-7 1 7 14