Which one of the following supports the hypothesis that life has changed over time? 1. Fossils are distinct from rock layer to rock layer 2. The cell has no membrane 3. Prokaryotes has no nucleus 4. Some fossil plants have deep roots

What is the percent composition of NiO if a sample of NiO with a mass of 41.9grams contains 33.1 g Ni and 8.8 O

What is the periodic table based on? 1. The mass of atoms. 2. The charge of atoms. 3. The structure of atoms. 4. The color of atoms.

Zn + 2 HCl → ZnCl2 + H2 You are asked the following question: In the chemical reaction above, if you start with 100 grams of zinc, how many moles of hydrogen will be produced? What is the logical first step to solving this problem?

Most elements are Select one: a. metals. b. nonmetals. c. metalloids. d. semiconductors.

Which of the following statements is true about energy quantization at the atomic level? Electrons in the outermost orbits are the most stable. Electrons in all the orbits around the nucleus have the same amount of energy.

The atomic mass of fluorine in 19.0 amu, so the molar mass is?

A rod shaped organism with no nucleus commonly found in Garbage will most likely belong to which kingdom

Alka-Seltzer is a solid mixture of two substances, sodium bicarbonate (NaHCO3) and citric acid (H3C6H5O7). The substances react to form water, carbon dioxide (CO2), and Na3C6H5O7.

Four properties of water are listed. 1. It is colorless and odorless in its pure form. 2. It reacts with metals to form metal hydroxide and hydrogen gas. 3. When heated to 100 °C, water evaporates. 4. It decomposes to form hydrogen and oxygen.

Water is A. Acidic B. Basic C. Neutral