Which organism lived on Earth during the Precambrian time? A. fern B. dinosaur C. cyanobacteria D. octopus

You have a cup of water and a packet of powdered juice mix. You stir some of the powder into the cup of water and it quickly dissolves. You decide to add more juice mix to the cup and stir again. Again, the powder quickly dissolves.

A voltaic cell is constructed with a Cu/Cu2 half-cell and an Ni/Ni2 half-cell. The nickel electrode is negative. Write both balanced half-reactions and the overall reaction.

How many significant figures are there in 500 and 101.00?

The diagram is a representation of the electron sea model which statement best describes what is happening in this model? A. The electrons are floating to the top of the nuclei of metal atoms. B.

2Al + 3H2SO4 - > Al2 (SO4) 3 + 3H2How many grams of aluminum sulfate would be formed if 250g H2SO4 completely reacted with aluminum?

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