A proton is added to an atom of oxygen, oxygen-16. All but one statement is true.

a) the atom becomes an isotope

b) the charge of the atom changes

c) the mass of the atom increases

d) the mass of the nucleus increases

A temperature of 273 K is the temperature at which water A. evaporates. B. is at its densest. C. freezes. D. boils.

In the reaction HCl (aq) + NaOH (aq) → NaCl (aq) + H2O (l), if 45.0 milliliters of a 2.0 M HCl react in an excess of NaOH, how many grams of H2O will be produced?

Which of the following requires the most input of energy? A. melting a substance B. raising the temperature of the substance by 1° C C. decreasing the temperature of the substance by 1° C D. vaporizing a substance

The results of a classroom group activity performed to test the acidic or basic nature of two substances are shown in the table. Which of the following is true about the nature of the two substances

Which of the following is a substance that is found between the cell membrane and the nucleus, which primarily consists of water and holds organelles? A. cytoplasm B. cell membrane C. mitochondria D. chloroplast

What do nucleus act as

Change of state may occur when?

During the combustion of 2.00 g of coal, the temperature of 500 g of water inside the calorimeter increased from 25.0°c to 43.7°c. the specific heat of water is 4.18 j/g·°c. how much heat did the reaction generate?

Catalysts are substances that increase the rate of reaction but can be recovered unchanged at the end of the reaction. Catalysts can be classified as either homogeneous (same state as reactants) or heterogeneous (different state than reactants).

How many molecules are there in 79g of Fe2O3?