Identify each of the following as either a physical change or a chemical change. Explain your answers.

A. a piece of wood is sawed in half.

B. milk turns sour.

C. melted butter solidifies in the refrigerator.

Which of these is not a function of DNA polymerase? adding base pairs correcting errors unwinding the helix replicating the DNA strand

Balance the following reaction. A coefficient of / "1/" is understood. C4H10 + O2 → CO2 + H2O.

A straight chain hydrocarbon with the formula C6H12: has a triple C-C bond has a double C-C bond is essentially inert has two double C-C bonds

How many atoms are in 26.8 g Fe

Which statement correctly describes a solution with a pH of 9? (1) It has a higher concentration of H3O + than OH - and causes litmus to turn blue. (2) It has a higher concentration of OH - than H3O + and causes litmus to turn blue.

Suppose a 500. mL fiask is filled with 1.8 mol of Cl 2, 0.60 mol of HCl and 0.40 mol of CCl4. The following reaction becomes possible: ci2 (g) + CHCİ 3 (g) - HCI (g) + CC, (g) The equilibrium constant K for this reaction is 5.

What combination of factors can change dry ice into a liquid

Rob is conducting an experiment in which he measures a person's body temperature in response to changes in air temperature. What is the independent variable that is manipulated in the experiment?

How many joules of energy are needed to warm 5.00 g of silver from 25.0°C to 27.5°C? (The specific heat of silver is 0.24 J/g°C.)

In the reaction of magnesium with oxygen gas, a considerable amount of energy was released. This is an example of an exothermic reaction.