Elena weighed out 50 grams of salt. She dissolved the salt in 285 grams of water. After she added salt the water had 335 grams of weight. How did the addition of the salt affect the final mass and volume of the mixture?

How would you describe an electron

Which one of the following statements is true? The internal energy of a system will not chage if there is no heat exchange between the system and its surroundings.

Kylie has two glasses with equal volumes of pure water. She adds 40 g of sugar to one of the glasses of water and 40 g of salt to the other. When sugar is dissolved in water, it does not change the number of ions present.

Do you think it is important that the United States have a strong central government?

Write an activity to show the change in state and change in temperature during a chemical reaction (change)

Which of the following is the best name for a compound made from nitrogen and oxygen? (N2O3) nitrogen oxide nitrogen II oxide nitrogen trioxide dinitrogen trioxide

Write the element symbol for the element with the abbreviated electron configuration [ne]3s23p2.

2. Describe in a step by step manner how you determined the identity of the two unknowns. Discuss both what you determined the unknowns to be and the method that you used to find them.

Number of hydrogen atoms in NaC2HO4

Calculate the pH for an acid that has a [H+] of 5.8 x10^-11 M.