If oxygen is removed from a sample of air as iron rusts, what happens to the partial pressure of oxygen in the air? A it increases B it decreases or C stays the same

What is ph and how does it measure the concentration of acids and bases?

Which of these statements is true about chemical reaction rates? A. The reaction rates cannot decrease B. the reaction rates cannot increase C. The reaction rates can change D. The reaction rates are always constant

When water H2O freezes into ice some of the properties have changed but the blank of the H2O is the same.

Energy stored and release in the nucleus of an atom

Fe3O4 (s) + CO (g) →FeO (s) + CO2 (g) What coefficients will balance the equation? A) 3, 1, 1, 1 B) 1, 1, 3, 1 C) 3, 3, 1, 1 D) 2, 2, 6, 4

What is true about the energy involved in a chemical reaction? A. The amount of energy is constant, but it is converted from one form to another. B. The amount of energy decreases as it is converted from one form to another. C.

Which state of matter is highly compressible, is made of particles moving independently of each other, and is present in large quantities near Earth's surface?

The air in an inflated balloon (the system) absorbs 125 J of heat from its proximity to a fire. The balloon expands and does 85 kJ of work. What is the change in internal energy (in kJ) (ΔU) for the system? Round to the nearest whole number.

Is a cytoplasm made of 80 percent of water

Calculate the acid concentration of a sample of acid rain with a ph of 4.20