Which of the following is a physical change

A copper roof changing colors from orange to green

Sawing a piece of wood in half

Rust forming on an iron fence

Burning a piece of wood

The specific heat of water is 4.18 joules per gram Celsius. How much he does 225.0 g of water release when it cools from 85.5°C to 50.0°C

What is the formula of a compound formed between iodine (I) and calcium (Ca) ?

Avogadro's number was calculated by determining the number of atoms in

Stephanie purchased two watermelons. One watermelon weighed 6.95 kilograms. The second watermelon weighed 952 grams more than the first. How much did the second watermelon weigh in grams? 1 kilogram = 1000 grams grams

What is the charge on an ion that has an atomic number of 27 and contains 26e-?

Condension occurs in the inside of your windows in Winters, why?

How can you use Hess's law to determine a reaction's enthalpy?

7. How much energy in KJ is released when 15.0 g of steam at 100.0 degrees Celsius is condensed and then frozen to ice at 0.0 degrees Celsius?

Consider the reaction: 8H2S (g) + 4O2 (g) →8H2O (g) + S8 (g). Δ[H2S]/Δt = - 0.033M/s. Find Δ[O2]/Δt. Δ[H2O]/Δt. Δ[S8]/Δt. Find the rate of the reaction.

At room temperature and pressure what is the volume of one mole of oxygen?