Give an example of something that is observable but does not contain matter.

Explain.

Which statement about a chemical reaction is true

Is skin cancer sex linked

You have a small piece of iron at 25 °C and place it into a large container of water at 75 °C. Which of these could be the temperature of the water after 10 minutes? A) 25 °C Eliminate B) 30 °C C) 75 °C D) 80 °C

What is a physical combination of substances? A. a compound B. a molecule C. a mixture D. an element

What is the energy of a photon of green light with a frequency of 5.76 times 10 to the fourteenth s to the negative one

What is a neutral atoms oxidation number

Suppose 30 grams of NaCl are placed in 900 mL of water. What is the molarity of this solution?

After a particularly cold day outside you go home to make some tea. you heat the water in the mug so that botch are about 75 degrees celcious. the tea bag is only 30 degrees celcious and the room is around 26 degrees celcious.

For main-group elements using the older numbering system the group number on the periodic table corresponds to which characteristic of the elements of that group

In the vertical columns of the periodic table, as the atomic numbers increase: a. the number of electron shells increases. b. the ionization energies increase. c. the number of electrons in the valence shell increases. d.