The melting and boiling points of compound A are 245 °C and 373 °C, respectively, and those of compound B are 296 °C and 388 °C. What is the physical state of A and B at 550 K. Select one: O A. A is a gas and B is liquid B. A is solid and B is liquid O C.A is liquid and B is solid O D. A and B are liquid O E. A andB are solid

Does the product formed during the combustion of magnesium in Test 6 (the ashy magnesium oxide) to weigh more than, less than, or the same as the original piece of magnesium? Explain.

You wish to prepare 237 grams of 26.7% (w/w) KI. Assume that the density of water is 1.00 g/mL. You will need grams of potassium iodide and mL of water.

An analytical chemist measures the amount of Elements E₁ and E₂ in four samples of an unknown Substance. sample of E1 1 2 3 mass mass of E2 4 16.0 g 9.1 g 17.1 g 9.8 g 18.5 g 10.6 g 12.0 g 6.9 g It's known that X contains no elements other than E₁ and E₂. Using this information, answer the questions in the table below. Is X a pure substance or a mixture? If you don't have enough information to decide, choose can't decide. If you said X is a pure substance, calculate the mass of Element E₁ the analytical chemist would find in a new 10.0 g sample of X. Round your answer to 2 significant digits. O pure substance O mixture O (can't decide) g

You are given a dye stock solution which contains  0.200 g/L dye.  If you place 20.0 mL of stock in a 50.0 mL volumetric flask and add distilled water to the line, what is the concnetration of the new solution in the flask? a. 0.080 g/L b. 0.800 g/L c. 0.500 g/L d. 0.00020 g/L

Help