Which of the following is a chemical reaction?

1 - Dropping a sliced orange into a vat of Sodium Dydroxide

2-Cutting a piece of paper into two pieces

3-Filling a balloon with air

4-Freezing liquid Mercury

Derek needs a tool that delivers 25.00 mL of a sodium hydroxide solution. What tool would be best for him to use?

What job can you do without going to college?

Use bond energies to calculate the enthalpy change for the following reaction. H2 (g) + CO2 (g) ⟶ H2O (g) + CO (g)

How many atoms of magnesium are in a 134 gram sample of magnesium?

Which of the answer choices best represents the approximate relative mass of the three subatomic particles? (Select all that apply.) protons = neutrons electrons = neutrons neutrons > electrons protons > electrons

14. Two or more substances that are together but do not combine to form a new, pure substance.

A solution of a compound with a known extinction coefficient of 23,100 M-1cm-1 has an absorbance of 0.735 in a 1.30cm path length, what is the concentration of the solution

Balance the following equation with the smallest whole number coefficients. Choose the answer that is the sum of the coefficients in the balanced equation. Do not forget coefficients of "one". RbOH + H3PO4 → Rb3PO4 + H2O

What is the temperature of 100 liter container having 1 mole of an ideal gas at a pressure of 20 kilopascals

5.2*10^26 molecules of ch4 in volume