2. Given: 2H2S(g) + O2(g) 25(g) + 2H20(g) a) What happens to (H20] if O2 is added? b) [O2] if H2S is removed c) [H2S] if O2 is added

In a lab students tested two properties of four substances. The results of the tests are shown the table below. Substance Phase at room Reaction with Reaction to flame temperature water Hydrogen Colorless Gas None Explodes Potassium Silver Solid Bubbling and reaction is hot. Burns and is likely to explode Sulfur Yellow Solid None Burns slowly and turns a color Strontium chloride White Crystalline Solid Dissolves Melts Which substance and explanation proves that no chemical change took place? O A. Hydrogen because it did not react with water and will explode when exposed to a flame. O B. Potassium because it bubbles in water and will explode when exposed to a flame Type here to search

NHẠNO3 MgSO4 [1] Mass of salt (g) 1.968 1.981 [2] Volume of DI water (mL) 50.0 50.0 0.039 0.0396 Mass of DI water (g) [3] Temperature of DI water (°C) 22.5 22.5 [4] Temperature of mixture after dissolution (°C) 19.5 27.1 3 4.6 Temperature difference (°C) [5] Total mass in reaction (g) [6] Enthalpy of solution AHsolution (cal/mol)

what is an atom? What is it characteristics? How does an atom live and exists in the biosphere?

Can you please please rewrite the question in your own words to clarify it, also write a useful hint to help you understand this problem and Provide the correct answer? Show the calculation and briefly describe the steps At the very end, write a paragraph addressing any knowledge/skill gaps, deficiencies in how you approach studying, and specifics on how you will improve Please answer fast and please try to answer all

A 195 mL sample of ocean water contains 7.0 gg of NaCl. What is the molarity of the solution with respect to  NaCl ?        Express your answer using two significant figures.

Sand and iron particles that are similar in size and color are mixed together in a beaker. What would be the best method of separating the particles? A- Add water to the mixture B- Use tweezers to separate them. C- Pour the mixture into a filter. Use a magnet to separate them.

8.00 grams of sodium sulfate dissolves in water. This is then reacted with 8.00grams of calcium chloride dissolved in water. Sodium chloride and another compound are the products. What is the name of the other product?

If a chemist were given 2.99 grams of a mixture of sugar and sand which gave 1.35 grams of sand on analysis of the mixture, what percent by mass of sugar should the chemist report for the composition of the mixture?