Today we have seven major continents however most geologists dont think it was like this 200 million years ago they think there was just?

Using the periodic table, determine which material is most likely to be a good conductor. a. sodium b. bromine c. carbon d. oxygen

Which of the following statements is true? U-235 is an isotope of uranium. Hydrogen atoms are heavier than uranium atoms. Fusion reactions require extremely low temperatures. Chemical energy is the energy inside the nucleus of an atom.

Which action will increase the number of collisions without changing the energy of reactant molecules?

Chemical formula of ethanoic acid

Which of the following could be the molecular formula for an alkane? A - C7H16 B - C7H14 C-C7H12 D-C7H10

How are amounts of hydrogen and oxygen gas made from the electrolytic decomposition of water related to the chemical formula of water?

Hydrogen peroxide decomposes to water and oxygen at constant pressure by the following reaction: 2H2O2 (l) → 2H2O (l) + O2 (g) ΔH = - 196 kJ Calculate the value of q (kJ) in this exothermic reaction when 3.

What is the concentration of hydronium in each of the following cases: [OH-] = 10-12 M? [OH-] = 10-2 M?

Which statement best explains why elements are matter? An element is a physical substance that has mass and takes up space. Elements are pure substances that cannot be divided chemically. Each element is a pure substance composed of one type of atom.

Which of the following best describes what causes the phases of the moon? The alignment of the sun, Earth, and moon The speed of the moon around the Earth The speed of the Earth around the sun The alignment of the planets