2. a solution that contains a small amount of salt and a large amount of water is said to be a solution.
a. concentrated
b. saturated
c. monounsaturated
d. dilute
student b
incorrect
reference:

6. all of the following are assumptions presented by dalton's atomic theory except that
a. atoms don't break into pieces even during chemical reactions.
b. atoms combine with other atoms.
c. all atoms of different elements are alike in size, shape, and weight.
d. all matter consists of atoms.
student b
incorrect
reference:

9. which of the following is true in regard to ions?
a. an ionized atom has a number of protons that is unequal to the number of electrons.
b. ions can only carry positive charges.
c. a cation will hold a positive charge if it gains one or more electrons.
d. losing one or more electrons will turn an atom into an anion.
student c
incorrect
reference:

11. which of the following medicinals are utilized to reduce pain?
a. tranquilizers
b. sulfonamides
c. analgesics
d. insulin injectables
student a
incorrect
reference:

14. when given a compound, adding up all of the of all of the individual atoms within one molecule of a compound will determine the molecular mass.
a. atomic numbers
b. atomic masses
c. electrons
d. protons
student d
incorrect
reference:

15. with regard to the ph scale, a solution with a ph
a. higher than 7 is considered an acid.
b. lower than 7 is considered basic.
c. of 6 is considered neutral.
d. close to 14 is considered a strong base.
student b
incorrect
reference:

19. which of the following classifications of matter includes materials that can no longer be identified by their individual properties?
a. element
b. compound
c. mixture
d. atom
student d
incorrect
reference:

20. the valence of an element or radical is
a. equal to the number of positive or negative charges on the ion.
b. greater than the number of positive or negative charges on the ion.
c. less than the number of positive or negative charges on the ion.
d. not related to the number of positive or negative charges on the ion.
student b
incorrect
reference:

2. A dilute solution means that the amount of solvent (water, for this particular case) is significantly larger than the solute (salt). Thus, the answer is D. 6. John Dalton's atomic theory states that matter is made up of tiny indestructible objects called matter. The theory also indicates that although same elements have the same atoms, each element have unique set atoms that deinfe them. From this, we can conclude that the wrong assumption is C. 9. Atoms, by default, are electrically neutral. When an atom loses or gains electron/s, then they become ionized atoms or commonly called as ions. Thus, ionized atoms imply unequal number of protons and electrons. This means the answer must be A. 11. Analgesics are commonly used to relieve pain. Thus, the answer is C. 14. Adding up the atomic mass of the individual atoms will give you the molar mass of a compound. Therefore, the answer is B.: 15. The pH scale provides us the alkalinity or acidity of a solution based on the value. A value between 0 to 6 indicates that the solution is acidic. 7 is considered neutral and a value between 7 and 14 indicates that the solution is basic. Thus, the answer is D. 19. An element has consistent properties and can no longer be further identified into having individual properties. Thus, the answer is A. 20. The valence of an element dependeds on the number of electrons on the outermost shell. Thus, it is equal to the number of charge negative or positive charges on the ion. Hence, we have A. :

Energy transformations are processes that convert energy from one type (e.g., kinetic, gravitational potential, chemical energy) into another. any type of energy use must involve some sort of energy transformation.energy must obey the laws of thermodynamics.thermodynamics is the study of how energy changes from one type to another. the laws of thermodynamics apply to energy and energy conversions.the first law of thermodynamics: main articleenergy cannot be created or destroyed (which is called the conservation of energy); however, it can be transformed from one type into another. in fact, every useful process transforms energy from one form to another. there are many different forms or types of energy. some examples of everyday energy transformations are: scenario energy conversions involvedrubbing hands together to make them warm kinetic energy to thermal energyusing a battery-powered flashlight chemical energy to electrical energy (in the battery)electrical energy to radiant energy (in the bulb)an object speeding up as it falls gravitational potential energy to kinetic energythe second law of thermodynamics: main articlesome forms of energy are more useful than others. using energy always makes it less useful, even though no energy is actually destroyed.kinetic energy and electricity are the most useful forms. these are "high-quality" because they can be transformed almost completely into any other type of energy. electricity, for example, can be easily used to generate heat (thermal energy) or light (radiant energy), break chemical bonds (chemical energy), move objects (kinetic energy), or lift objects (gravitational potential energy).the least useful form of energy is low-temperature thermal energy. it can still be converted back to a higher-quality form, but useful energy is always lost in this process. converting energy to a less-useful form and then trying to work backwards never gets 100% of the useful energy back.for example, when a car runs, the engine will become hot (thermal energy). the warmth of the engine does nothing to the car move or go faster. this wasted energy is an unavoidable by-product of converting the car's fuel (chemical energy) into movement ("high-quality" kinetic energy), however it can potentially be used for heating the cabin of the car to slightly increase overall energy efficiency. it is a challenge for all forms of power generation to minimize wasted energy and be as efficient as possible.