A &P 1 Ch. 2 Chemical Level of Organization

A substance dissociates into K+ and Cl- in solution.The substance is a(n) ________.

A salt

________ reactions release energy

Catabolic, exergonic, and decomposition

AB→A+B is a general notation for a(n) ________ reaction

Decomposition

A molecule of ammonia contains one atom of nitrogen and three atoms of hydrogen. These are linked with ________.

Polar covalent bonds

The energy stored in a foot of snow on a steep roof is ________.

Potential energy

The characteristic that gives an element its distinctive properties is its number of ________.

Protons

Chewing a bite of bread mixes it with saliva and facilitates its chemical breakdown. This is most likely due to the fact that ________.

Saliva contains enzymes

A substance formed of crystals of equal numbers of cations and anions held together by ionic bonds is called a(n) ________.

Salt

Jenny mixes up a batch of pancake batter, then stirs in some chocolate chips. As she is waiting for the first few pancakes to cook, she notices the chocolate chips sinking to the bottom of the clear glass mixing bowl. The chocolate chip batter is an example of a ________.

Suspension

The bonding of calcium, phosphorus, and other elements produces mineral crystals that are found in bone. This is an example of a(n) ________ reaction.

Synthesis

True or false? Covalent bonds are stronger than ionic bonds

True

Nitrogen has an atomic number of seven. How many electron shells does it likely have?

Two

When an atom donates an electron to another atom, it becomes

an ion

The smallest unit of an element that still retains the distinctive behavior of that element

atom

On the periodic table of the elements, mercury (Hg) has an atomic number of 80 and a mass number of 200.59. It has seven stable isotopes. The most abundant of these probably have ________.

more than 80 neutrons each

CH4 is methane. This compound is

organic

four elements make up more than 95 percent of the body's mass. These include ________.

oxygen, carbon, hydrogen, and nitrogen

Which of the following is most likely to be found evenly distributed in water in a homogeneous solution?

sodium ions and chloride ions