How many valence electrons does iron have?

Which equation represents sublimation? (1) I2 (s) = = > I2 (g) (3) I2 (l) = = >I2 (g) (2) I2 (s) = = >I2 (l) (4) I2 (l) = = >I2 (s)

What categories did Lavoisier use when he classified the elements

Which compound is most likely a powerful and dangerous acid?

If 7.400 g of C6H6 is burned and the heat produced from the burning is added to 5691 g of water at 21 °C, what is the final temperature of the water?

A sample of As weighs 73.2 grams. Will a sample of Kr that contains the same number of atoms weigh more or less than 73.2 grams? (more, less) : Calculate the mass of a sample of Kr that contains the same number of atoms. grams of Kr

Which of the following is not true about the importance of the carbon cycle to living things? a. Plants use carbon dioxide to make energy. b. Carbon is the second most abundant molecule in organisms. c.

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