List three examples of observation of Earth by remote-sensing satellites

What must occur for a change to be a chemical reaction

The atomic symbols of nitrogen and oxygen are N and O, respectively. The chemical formula of a particular substance is NO2. Which of the following is a correct description of the substance? A.

For most compounds with a single keto group in the molecule, equilibrium favors the keto form over the enol form of the compound. this is due largely to what?

How does molecular shape affect polarity? O A. If the molecule is symmetric, the effects of polarity will cancel out. O B. If the molecule contains more than two bonds, shape will not affect polarity. O C.

Aqueous hydrochloric acid reacts with aqueous sodium sulfite to produce aqueous sodium chloride and aqueous sulfurous acid. Write a balanced chemical equation for this reaction.

Which term best describes C2O4 2-? polyatomic anion polyatomic cation monatomic anion monatomic cation

Calculate the volume of H2 (g) at 273 K and 2.00 atm that will be formed when 275 mL of 0.725 M HCl solution reacts with 50.0 g Zn (s) to give hydrogen gas and aqueous zinc chloride. (R = 0.08206 L atm/K mol)

Based on this information what is the most likely reason for refrigerating most foods reduce the rate at which they spoil

What is the activity of a 54.7 μCi sample of carbon-14 in becquerels?

2H2 + O2 - > 2H20 What is the mass of water that is produced from 4.00 moles of oxygen gas reacting with hydrogen gas?