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

A chemical reaction is carried out in a closed container. The energy absorbed by the chemical reaction is 50 kJ. What is the energy liberated from the air or the walls of the container? A) 50 kJ B) 75 kJ C) 25 kJ D) 100 kJ

Which of the following statements is true? A) non metals generally have higher ionization energies than metals B) the first ionization energy is always higher than the second C) the alkali metals have the highest ionization energies of all elements

What had its tempature changed in the "solubility" lab? A. Entire solution B. Solvent C. Solute

How a tornado can endanger property and people.

How many moles and grams of NaOH are needed to dissolve in water to make 4 liters of a 2.0M solution?

The wavelength of some violet light is 420.0 nm. What is the frequency of this violet light?

What is the molarity of 3.0 L of solution containing 4.0 moles MgO

I need to have a sentence with the word neap tide in it.

15 g of gold and 25 g of silver are mixed to form a single-phase ideal solid solution. How many moles of solution are there? What are the mole fractions of gold and silver? What is the molar entropy of mixing? What is the total entropy of mixing?

What mass of barium nitrate is dissolved in 21.29 mL of a 3.38 M solution?