Answer the following question given this paragraph: At the beginning of the reaction, only the reactants A and B are present. Recall that over the course of a reaction, the reaction rate slows down. This is because the rate depends on the concentrations of one or more reactants. As the reactants are used up, their concentrations drop, thus decreasing the reaction rate. Q: What happens to the reaction rate over the course of a reaction? Choices: - reverses - stays the same - speeds up - slows down A:
slows down
Answer the following question given this paragraph: Friction is a force that opposes motion between any surfaces that are touching. Q: What is a force that opposes motion between any surfaces that are touching? Choices: - vibration - tension - gravity - friction A:
friction
Q: Answer the following question given this paragraph: Q: A system in what state cannot spontaneously change, and therefore can do no work? Choices: - equality - balance - stability - equilibrium A:
A: equilibrium
Question: Answer the following question given this paragraph: Q: What do you call the fragments of cells involved in the clotting process that are suspended in blood plasma? Choices: - hematocrit - ironites - hemoglobin - platelets A:
Answer: platelets
*Question*
Answer the following question given this paragraph: Skeletal Muscles. Skeletal muscles enable the body to move. Q: What do skeletal muscles enable the body to do? Choices: - breathe - look - eat - move A:
**Answer**
move
(Question)
Answer the following question given this paragraph: Note that there is a system for naming some polyatomic ions; -ate and -ite are suffixes designating polyatomic ions containing more or fewer oxygen atoms. Per- (short for "hyper") and hypo- (meaning "under") are prefixes meaning more oxygen atoms than -ate and fewer oxygen atoms than -ite, respectively. For example, perchlorate is ClO 4 , chlorate is ClO 3 , chlorite is ClO 2 and hypochlorite is ClO. Unfortunately, the number of oxygen atoms corresponding to a given suffix or prefix is not consistent; for example, nitrate is NO 3 while sulfate is SO 4 2. This will be covered in more detail in the next module on nomenclature. The nature of the attractive forces that hold atoms or ions together within a compound is the basis for classifying chemical bonding. When electrons are transferred and ions form, ionic bonds result. Ionic bonds are electrostatic forces of attraction, that is, the attractive forces experienced between objects of opposite electrical charge (in this case, cations and anions). When electrons are "shared" and molecules form, covalent bonds result. Covalent bonds are the attractive forces between the positively charged nuclei of the bonded atoms and one or more pairs of electrons that are located between the atoms. Compounds are classified as ionic or molecular (covalent) on the basis of the bonds present in them. Q: What type of bonds are the attractive forces between the positively charged nuclei of the bonded atoms and one or more pairs of electrons that are located between the atoms? Choices: - active - gravitational - reactive - covalent A:
(Answer)
covalent