Butter melt when you heat it in a pan on the stove. Is this a chemical change or physical change? How can you tell?

Automotive airbags inflate when sodium azide decomposes explosively to its constituent elements. How many grams of sodium azide are required to produce 30.5 g of nitrogen?

Use Hess's Law or the summation equation to calculate the ΔHrxn. Round to the nearest tenth! ___NF (g) + ___F2 (g) - -> ___NF2 (g) ½N2 (g) + ½F2 (g) - > NF (g) Hf = 86.6 kJ ½N2 (g) + F2 (g) - > NF2 (g) Hf = 33.8 kJ

What reaction always accompanies the oxidation of a metal

A cup of coffee is so hot that it cannot be drunk. As a result, an ice cube is put into the coffee. What direction is the energy moving? When would the energy flow stop?

If you bend a straight chain of carbons, do you make a different structure? Why or why not?

Which is a non renewable resource that is used to generate electrical energy

How many grams of sulfur (S8S8) must be dissolved in 100.0 g naphthalene (C10H8C10H8) to make a 0.11 mm solution

Mason compare the properties of two compounds magnesium oxide is an ionic compound and hydrogen peroxide is not an ionic compound there for both compounds most likely

Cisplatin is synthesized as follows: K2PtCl4 (aq) + 2NH3 (aq)  Pt (NH3) 2Cl2 (s) + 2KCl (aq) What mass of cisplatin can be made from 100. g of K2PtCl4 and sufficient NH3? What mass of KCl is also produced?

What is the total number of protons in the nucleus of an atom of potassium-42? (1) 15 (3) 39 (2) 19 (4) 42