Which of the following is a compound?

a. air

b. soda

c. sterling silver

d. water

The research and design team of a car manufacturing company is developing a new safety product that automatically tests a car's brakes.

Predict the mass of oxygen that will be left over after the reaction of 48.6 grams of magnesium with 50.0 grams of oxygen? why do you think there was leftover oxygen? (why did not all of it react) ?

True or false: A recessive allele is able to mask or hide this expression of the other allele?

During natural selection, which organisms are most likely to survive as the environment changes

45.62mg of toluene is combusted and we get 152.5mg of carbon dioxide and 35.67mg of water vapor. What is the empirical formula of toluene?

Which of the following processes includes all of the others? Group of answer choices transport of an ion down its electrochemical gradient osmosis passive transport facilitated diffusion

How is the Bohr atomic model different from the plum-pudding model? A. In Bohr's model, the atom's mass is found at its center instead of distributed throughout. B. In Bohr's model, the atom's mass is mostly made up of electrons instead of protons.

What does the cell theory state? A. that cells come from other cells B. that cells come only from animals C. that cells cannot be created or destroyed

For which one of the following molecules is the indicated type of hybridization not appropriate for M the central atom? a. BeCl2 sp2 b. SiH4 sp3 c. BF3 sp2 d. C2H2 sp e. H2O sp3

P4O10 (s) = - 3110 kJ/mol H2O (l) = - 286 kJ/mol H3PO4 (s) = - 1279 kJ/mol Calculate the change in enthalpy for the following process: P4O10 (s) + 6H2O (l) → 4H3PO4 (s)