What is a massive plasma ball

Which substance represents a compound? 1. CS2 (s) 2. Cs (s) 3. C (s) 4. O2 (9)

Name the product formed by the reduction of d-gulose.

in your own words. explain why it was possible for mendeleev to organize the elements into the periodic table

A helium balloon has an internal pressure of 1.05 atm and a volume of 5.0 L. If the temperature where the balloon is released is 20 °C, what will happen to the volume when the balloon rises to an altitude where the pressure is 0.

An interglacial is a period of time that occurs between Ice Ages. It's marked by warmer temperatures and milder climates. During previous interglacials, the CO2 levels in the atmosphere were about 280 parts per million (ppm).

Write the structire of the salt that forms when diethylamine is mixed with hydrochloric acis

The heat of combustion of propane, C3H8, is 2220 kJ/mol. The specific heat of copper is 0.385 J/g°C. How many grams of propane must be burned to raise the temperature of a 10.0 kg block of copper from 25.0°C to 65.

Which is an example of Temporal Isolation? A. Flowers that bloom in different months. B. Birds that have different mating calls C. Fruits flies that mate in different locations. D. Squirrels that have different fur colors

A chemical reaction can start when enough activation energy is added to the reactants. Do you think the activation energy for chemical reactions in living things is high or low / Explain your answer

20 Which statement describes a reversible reaction at equilibrium? (1) The activation energy of the forward reaction must equal the activation energy of the reverse reaction.