A substance changes state from solid to liquid. What has happened?

O Aphysical change

O A chemical change

O A chemical reaction

The creation of matter

In a different experiment, the student uses a calorimeter which is perfectly insulated. She fills the calorimeter with 100.0 g of 25.00°C dilute HCl solution and adds 0.594 g Mg metal (24.3 g/mol). The final temperature of the apparatus comes to 41.

Consider the Gibbs energies at 25 ∘ C. Substance Î" G ∘ f (kJ â‹ ... mol âˆ' 1) Ag + (aq) 77.1 Cl âˆ' (aq) âˆ' 131.2 AgCl (s) âˆ' 109.8 Br âˆ' (aq) âˆ' 104.0 AgBr (s) âˆ' 96.9 (a) Calculate Î" G ∘ rxn for the dissolution

Gravitational, elastic, and chemical are three forms of

Arrange the bonds in order based on bond length. Start with the longest bond, and end with the shortest bond. C≡N bond energy = 887 kJ/mol C=N bond energy = 615 kJ/mol C-N bond energy = 305 kJ/mo

If steel wool was balled up and compacted, would it burn faster or slower? Explain.

What is the volume of 2.00 moles of chlorine (cl2) gas at stp, to the nearest tenth of a liter?

A reaction of 12.640 g of copper oxide with 0.316 g hydrogen produces 2.844 g of water and Xg of copper. X=_9

If i burn steel wool inside a closed jar or bottle will the oxygen be completly gone

700 grams of glucose reacted fully with oxygen How many moles of gas will be created

The uranium used for nuclear fuel exists in nature in several minerals. Calculate how many moles of uranium are in 8.00 moles of the following: 1. carnotite, K2 (UO2) 2 (VO4) 2 • 3H2O 2. uranophane, CaU2Si2O11 • 7H2O 3.