What does the subscript in a chemical formula represent (the 2 in H2) ?

A large sport utility vehicle has a mass of 2600 kg. Calculate the mass of CO2 emitted into the atmosphere upon accelerating the SUV from 0.0 mph to 66.0 mph. Assume that the required energy comes from the combustion of octane with 30% efficiency.

The density of water is determined by measuring the mass of a known volume of water. If you determined the density of a 25-mL sample of water, how many significant figures should you report if you used a s instruments?

How do the number and kind of atoms in the reactants compare to the number and kind of atoms in the products

Identify which equations represent redox reactions, providing a name for the reaction if appropriate. For those reactions identified as redox, name the oxidant and reductant.

Which statement best describes a cell? A. A compartment that contains DNA and regulates when genes are turned on and off. B. the smallest structural and functional unit of organism can can be said to be alive. C.

Label the molecular shape around each of the central atoms in the amino acid glycine. hint

Which has more atoms, 2moles of carbon or 2 moles of aluminum

At 100 degrees c, water reacts with acetic anhydride to make acetic acid. also, at 100 degrees c, water reacts with acetylsalicylic acid and reverts it to salicylic acid and acetic acid.

What is the valence electron configuration of the group 2a elements?

Which of the following statements about monosaccharide structure is true? A) Aldoses and ketoses differ in the position of their hydroxyl groups. B) Monosaccharides can be classified according to the spatial arrangement of their atoms.