An object exerts 140 N of force on a surface that has an area of 2.0 m2. How much pressure does the object exert?

Why are the terrestrial planets closest to the sun while the gas planets are farther from the sun?

An isotope undergoes radioactive decay by emitting radiation that has no mass. What other characteristic does the radiation have? some shielding required positive or negative charge low penetrating power no charge

An iceberg has a volume of 9470 ft3. What is the mass in kilograms of the iceberg? The density of ice in the iceberg is 0.92 g/cm3.

An ion has 12 protons, 14 neutrons, and 10 electrons. the symbol for the ion is

The atomic number is what?

Why do cells have a plasma membrane? A. to separate protein from the nucleus B. to distinguish plants from animals C. to define the size of the cell D. to separate the inside of the cell from its enviroment

Base on its molecular mass, what is the molar mass of iron

For the following reaction in aqueous solution, identify all those species that will be spectator ions. Select all that apply. Na, SO4+Hg (NO3) 2HSO4+2NaNO3 Choose one or more: A. Hg2S04 B. Na2S04 C. Nat D. NO3 E. SO42- F. Hg2 (NO3) 2 G. NaNO3 H.

One mole of which hydrocarbon requires 8 mol o2 to achieve complete combustion to give carbon dioxide and water?

How many bromine atoms are present in 39.9 g of CH2Br2