Answer the following question given this paragraph: An ionic crystal lattice breaks apart when it is dissolved in water. Dissociation is the separation of ions that occurs when a solid ionic compound dissolves. It is important to be able to write dissociation equations. Simply undo the crisscross method that you learned when writing chemical formulas of ionic compounds. The subscripts for the ions in the chemical formulas become the coefficients of the respective ions on the product side of the equation. Shown below are dissociation equations for NaCl, Ca(NO 3 ) 2 , and (NH 4 ) 3 PO 4 . Q: What do you call the separation of ions that occurs when a solid ionic compound dissolves? Choices: - deformation - decomposition - dissolution - dissociation A:
dissociation
Answer the following question given this paragraph: Cell Structure The cells of protists are among the most elaborate of all cells. Most protists are microscopic and unicellular, but some true multicellular forms exist. A few protists live as colonies that behave in some ways as a group of free-living cells and in other ways as a multicellular organism. Still other protists are composed of enormous, multinucleate, single cells that look like amorphous blobs of slime, or in other cases, like ferns. In fact, many protist cells are multinucleated; in some species, the nuclei are different sizes and have distinct roles in protist cell function. Single protist cells range in size from less than a micrometer to three meters in length to hectares. Protist cells may be enveloped by animal-like cell membranes or plant-like cell walls. Others are encased in glassy silica-based shells or wound with pellicles of interlocking protein strips. The pellicle functions like a flexible coat of armor, preventing the protist from being torn or pierced without compromising its range of motion. Q: What functions like a flexible coat of armor, preventing the protist from being torn or pierced without compromising its range of motion? Choices: - fimbriae - biofilm - endothelium - pellicle A:
pellicle
Q: Answer the following question given this paragraph: Motor vehicles account for almost half of fossil fuel use. Most vehicles run on gasoline, which comes from petroleum. Q: Motor vehicles account for almost half of the consumption of what? Choices: - hydrocarbon - greenhouse gases - electricity - fossil fuel A:
A: fossil fuel
Question: Answer the following question given this paragraph: A fully developed placenta, like the one in Figure below , is made up of a large mass of blood vessels from both mother and fetus. The maternal and fetal vessels are close together but separated by tiny spaces. This allows the mother's and fetus's blood to exchange substances across their capillary walls without the blood actually mixing. Q: A fully developed placenta is made up of a large mass of what? Choices: - brain tissues - plant cells - estrogen hormones - blood vessels A:
Answer: blood vessels
*Question*
Answer the following question given this paragraph: The nitrogen atom of a primary amine is bonded to two hydrogen atoms and one carbon. The nitrogen atom of a secondary amine is bonded to one hydrogen and two carbons. The nitrogen atom of a tertiary amine is bonded to three carbon atoms. Amines are typically named by a common system rather than by IUPAC guidelines. The common system for naming amines along with several examples is shown below. Q: How many hydrogen atoms does a nitrogen atom of a primary amine have? Choices: - four - six - ten - two A:
**Answer**
two
Answer the following question given this paragraph: Earth goes through regular changes in its position relative to the Sun. Its orbit changes slightly. Earth also wobbles on its axis of rotation. The planet also changes the tilt on its axis. These changes can affect Earth's temperature. Q: Earth goes through regular changes in its position relative to? Choices: - the moon - saturn - mars - the sun A:
the sun