Which of the following is the best indication that a chemical change has taken place?

a. The matter changes color.

b. A mixture separates into layers.

c. The change is reversible.

d. The shape of the substance changes.

Using the symbol M for the element, write the chemical formula for the compound that forms when element M reacts with iodine.

Question 5 why does grinding solid crystals increase the rate of dissolving for a solid solute in water? smaller crystals are more polar. smaller crystals are more nonpolar. smaller crystals have more energy. smaller crystals have more surface area.

In addition to decreasing the amount of fat in a dish, salsa can also increase the amount of A. vitamin C and fiber. B. calcium and phosphorus. C. calories and cholesterol. D. sodium and cholesterol.

Which situation is no work being done

How many valence electrons does sodium have? * Na

An organic compound contains C=61%, H=11.8% and O=27.12%. Calculate the empirical formula and molecular formula of the compound. The vapour density of the compound is 59.

Roberto throws a tennis ball to a friend. He then throws a baseball with the same amount of force. Which ball is accelerated more? Why?

How does parsec compare to light year

A sample of solid NH4NO3 was placed in an evacuated container and then heated so that it decomposed explosively according to the following equation: NH4NO3 (s) N2O (g) + 2H2O (g) At equilibrium, the total pressure in the container was found to be 2.

Look at the chemical formula for glucose, how many carbon C, hydrogen H, and oxygen O, atoms are found in a molecule of glucose?