What is an endothermic reaction?

O A. A reaction that produces heat

O B. A reaction that uses radiation waves

C. A reaction that absorbs heat

O D. A reaction that contains enthalpy

How is it possible to predict the type of bond that is likely to be found in a substance? what types of atoms generally form ionic or covalent bonds? how can electronegativities be used to determine the type of bond?

If my friend lives in the south America and it's summer what is north America having?

Hypothesis: If a fixed amount of gas is heated, then the volume will because the heat will cause the molecules of gas to move

Jacques moves a bar magnet near a circle of copper wire. Moving the magnet creates a changing magnetic field passing through the copper loop.

5. Which of the following identifies an element?| a. proton C. electron b. neutron d. antineutrino

Determine the number of grams of NaCl necessary to make up 100 mL of a 0.10 M solution. 0.017 g 0.58 g 1.7 g 58 g

What causes an increase in the average global temperature?

Which of the following is true regarding nuclear fission and nuclear fusion? A. Both of these processes can provide energy. B. Our sun's heat is an example of both of these processes. C. Both of these processes are equally complex to control. D.

It takes 5.2 minutes for a 4.0 g sample of francium-210 to decay until only 1.0 g is left. What is the half-life of francium-210? 7.8 minutes 1.3 minutes 2.6 minutes 5.2 minutes

What is the correct orbital diagram for carbon