Which of there is an indication that a chemical reaction has occurred?

a. freezing of substance

b. a change in color of a substance

c. melting of a substance

d. boiling of a substance

Heat transfers more slowly when the object is

1) is water condensing a into liquid water a physical change or a chemical change? 2) what is the difference between dependent and independent variables when conducting an experiment?

If a gas is moved from a large container to a small container but its temperature and number of moles remain the same, what would have happened to the pressure of gas

Was the belief that they (1) were better educated than native-born Americans (2) had a higher standard of living than most Americans (3) adapted easily to American culture (4) competed with Americans for jobs as unskilled laborers

Suggest an explanation for the observations that ethanol, C2H5OH, is completely miscible with water and that ethanethiol, C2H5SH, is soluble only to the extent of 1.5 g per 100 mL of water.?

Least reactive element of period 3

A chemical formula shows the kind and number of Atoms that form a what? compound, mixture, solution, or suspension

What gas was used as a deadly posiosn in world war 1?

Four moles of hydrogen chloride (HCl) gas react with one mole of oxygen (O2) gas to produce two moles of chlorine gas (Cl2) and two moles of water gas (H2O).

what noble gas electron configuration is achieved by the bromine atoms in a molecule of BR2, a diatomic element?