Why might the iodine change color when it combines with starch?

Zn (s) + 2 HCl (aq) →ZnCl2 (aq) + H2 (g) Zn (s) reacts with HCl (aq) according to the equation shown above. In trial 1 of a kinetics experiment, a 5.0g piece of Zn (s) is added to 100mL of 0.10MHCl (aq).

The Nuremberg War Crimes trials established the international legal precedent that (1) the United States will give refugee status to all victims of war (2) individuals who violate human rights can be held responsible for their actions (3) invaders

A compound contains 70.18 % oxygen by mass. What mass of this compound would be needed to obtain 48.45 grams of oxygen?

What does the formula for an ionic bond really mean

In the following table, all the columns for the element beryllium are filled out correctly.

Fruit flies can either have a brown body or a black body. The allele for a brown body (B) is dominant to the allele for a black body (b). A brown fruit fly was crossed with a black fruit fly as shown below.

A light-year measures the distance a light beam can travel in one year. One light-year is equal to 9 500 000 000 000 kilometers.

The first ionization energy, e, of a potassium atom is 0.696 aj. what is the wavelength of light, in nm, that is just sufficient to ionize a potassium atom? values for constants can be found here.

A gene is a to a chromosome as (A) a pea is to a pod (B) a front to a back (C) a bike is to a car (D) a building is to a window

How are you enjoying this weather? (i need good reasons}