Is Oxygen - O2 a pure substance or a mixture?

How many atoms are present in 34.96 moles of mg

Over time heat and pressure can change quartz into quartzite quartzite is A. An ingenious rock B. A metamorphic rock

The billiard ball model was working model of the atom until Thomson discovered the

How does matter affect our daily life?

Sodiun atom, potassium atom, and cesium atoms have the same?

You are conducting an experiment on plant growth. You take a plant fresh from the soil that weighs 5 kilograms (kg). Then you dry the plant overnight and determine the dry weight to be 1 kg.

What is the ratio of Fe+3 ions to O2 - ions in a neutral compound? a. 1:2 b. 2:1 c. 2:3 d. 3:2

What is the specific heat capacity of a 17.5g sample of an unknown metal that releases 6700J of heat when it cools from 90 to 25 degrees C?

How can equilibrium of a closed system chemical reaction be disturbed? Select all that apply. Adding or removing products or reactants. Keeping the concentration of products and reactants the same. Keeping the temperature of the system constant.

Why does an exothermic reaction need activation energy?