Which of the following is a decomposition reaction?

A. 2Mg+O2 - > 2MgO

B. CH4+2O2 - > CO2+H2

C. 2H2O + 2Na - > 2NaOH+H2

D. CaCO3 - >CaO+CO2

Naturally occurring rubidium consists of about 73.2% rubidium-85 (atomic mass 84.9 u) and 27.8% rubidium-87 (atomic mass 86.9 u). calculate the average atomic mass of rubidium rounding your answer to 0.1 u

Gaseous methanol (CH4O) reacts with oxygen gas to produce carbon dioxide gas and liquid water. Balanced the equation using the lowest possible whole numbers. What is the sum of the coefficients in the balanced equation?

Which of the following must be true about a reaction if it is only spontaneous at high temperatures? A) it is exothermic, with both negative enthalpy and entropy changes. B) It is endothermic, with both positive enthalpy and entropy changes.

How much energy (in kilojoules) is required to melt 160 g of ice and raise the temperature to 77°C

Is the following sentence true or false. very few minerals are compound

In which type of unconformity is the eroded rock tilted or folded? disconformity nonconformities angular unconformity scarp unconformity

What's the difference between an iconic bond and a covalent bond? A. an iconic bond Is a bond between charged atoms, while a covalent bond is a bond between neutral atoms B.

4. Given the chemical formulas of the following compounds, name each compound and state the rules applied to determine each name. Score • RbF • CuO • (NH4) 2C2O4 (Note: C2O4 - is called oxalate.)

The earth names for the 30 alien elements in order of atomic number

Worth 30 pts. Liquid vinegar and solid baking soda chemically react to form solid sodium acetate, liquid water, and carbon dioxide gas.