When you add food coloring to water, is a chemical or physical change?

A 30.60 g sample of a substance is initially at 25.6 °c. after absorbing 2811 j of heat, the temperature of the substance is 175.0 °c. what is the specific heat (c) of the substance?

Compare the reactivity of alcohols with the length of the R-group.

Half-life problems: (a) Hg-197 has a half-life of 64 hours. If you have 164g of Hg-197 today, how much will you have in 448 hours? (b) 263 minutes ago we had 5.12g of I-134 and now we only have 0.16g.

A balloon filled with helium has a volume of 6.3 L. What is the mass, in grams, of helium in the balloon?

When making a solution of sugar and water, you begin with a 500 ml beaker, 10 grams of sugar, and 400 ml of distilled water. which procedure will allow you to dissolve the most sugar in the least amount of time?

In the Table of Atomic Particles, various symbols have two numbers. The top number represents the atomic mass of the particle, what do the bottom numbers represent? Select all that apply.

A chemist is working on a reaction represented by this chemical equation: FeCl2 + 2KOH → Fe (OH) 2 + 2KCl. If the chemist uses 4.15 moles of iron (II) chloride and 3.

vWould radiation with a wavelength 0.91 nm or a frequency of 5.9*1011 s-1 be detected by an X-ray detector? Would radiation with a wavelength 0.91 or a frequency of 5.9*1011 be detected by an X-ray detector? Only the radiation with a wavelength 0.

Why Thioacetamide is heated?

Which compound decreases in solubility as the temperature of the solution is increased from 10c to 50c