What hypothesis states that the continents were once joined to form a single supercontinent? A. continental drift B. paleomagnetism C. plate tectonics D. sea-floor spreading

Write an algebraic expression to repro 1.4 times a number, increased by 7

Which of the following is not true of chemical changes? A chemical change rarely occurs at the molecular level. Flammability and decomposition are examples of chemical changes. Chemical changes involve a rearrangement of atoms to form new substances.

What determines the reactivity of an element? The number of protons in the nucleus The number of electrons in the outer energy level The number of electrons in the innermost energy level The number of neutrons in the nucleus

The amount of energy needed to split the nucleus into individual protons and neutrons

The electronegativity is 2.1 for h and 1.9 for pb. based on these electronegativities pbh4 would be expected to

Ammonium perchlorate is a powerful solid rocket fuel, used in the Space Shuttle boosters. It decomposes into nitrogen gas, chlorine gas, oxygen gas and water vapor, releasing a great deal of energy.

Determine the number of bonding electrons and the number of nonbonding electrons in the structure of SeCl2.

The same amount of energy is required to remove each electron sequentially from an atom. A. TrueB. False

Crude oil may contain hundreds of different types of hydrocarbons. Some examples include: Butane (C4H10) Dodecane (C12H26) Octane (C8H18) Benzene (C6H6) Many common fuels, such as gasoline and kerosene, are combinations of these substances or others.

What will happen if the concentration of water inside a cell is higher than the concentration of water outside a cell?