Which is not a compound?

oxygen gas

water

silicon dioxide

carbon dioxide gas

Why does a higher concentration make a reaction faster? There are more collisions per second and the collisions are of greater energy. Collisions occur with greater energy. There are more collisions per second.

How does the entropy change in the reaction 2C2H2 (g) + 5O2 (g) 4CO2 (g) + 2H2O (l) ? A. The entropy increases. B. The entropy stays constant. C. The entropy decreases. D. It is impossible to tell.

Which of these is a bacteria? E-coli HIV Yeast Zika

What is really happening to generate electricity?

Which symbol can be used to indicate the pressure at which a chemical reaction is carried out? 25°C 2 atm Pt

You just calculated that the heat of fusion for chloromethane is 6400 J/mol. The heat of fusion for hydrogen is 120 J/mol. Which of the following account for this difference? a. Hydrogen has stronger intermolecular forces than chloromethane. b.

Magnesium burns with a very bright light. When the flame goes out, a White powder is left behind. what is the word equation for this reaction.

Identify the types of intermolecular forces found for each of the liquids and relate these to the shape of the drop as seen from the side. Include the terms cohesive and adhesive forces properly in your explanations.

Which type of experiment follows ethical standards?

What kind of change occurs when a compound is separated into its components?