化学
化学反応、化学量論、分子構造、元素の性質。
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multiple choice question an oxidizing agent is a(n) ________. o free ra…
B. electron acceptor
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when two substances were combined, bubbles were produced and the temper…
1. A chemical reaction took place (assuming the temperature drop is due to an endothermic chemical reaction). 2. B. \(2H_2 + O_2 ightarrow2H_2O\)
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what happens to atoms in a chemical reaction? they turn into energy. th…
For the first question: They are rearranged. For the second question: $3CuCl_2+2Al ightarrow 2AlCl_3 + 3Cu$
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a potassium atom is converted to a potassium ion when the atom ○ gains …
C. loses one electron.
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question 8 6 pts what is the formula of magnesium sulfate? mgs mgso3 mg…
Question 8: C. $MgSO_{4}$ Question 9: C. $Ca(NO_{3})_{2}$
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question 6 6 pts a lewis electron dot symbol shows all the electrons in…
Question 6: all the valence electrons in the ground - state of an atom. Question 7: loses two electrons.
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question 4 6 pts which type of chemical bond involves the transfer of e…
Question 4: ionic Question 5: potassium and fluorine
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question 2 6 pts elements of group va generally form ions with a charge…
Question 2: D. -3 Question 3: D. -2
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question 1 halogens generally form ions with a charge of +1. +2. -1. -2.
C. -1
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true or false question as a catalyst speeds up reaction rate, it is con…
False
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select all that apply which of the following is most likely to decrease…
Decrease temperature, Decrease concentration of reactants
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multiple choice question which type of reaction occurs when two molecul…
C. Exchange
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multiple choice question in general, reaction rate _______ when reactan…
B. increases
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fill in the blank question reversible reactions exist in a state of che…
equilibrium
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multiple choice question catalysts ______ reaction rates. increase do n…
A. increase
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multiple choice question up to a point, increasing the temperature of a…
B. increase
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multiple choice question what term is used to describe reactions that c…
D. Reversible
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fill in the blank question two molecules swap atoms or groups of atoms …
double - displacement
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select all that apply. which of the following will, in general, increas…
Increasing concentration of reactants, Increasing temperature
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multiple choice question a chemical reaction in which two or more small…
A. Synthesis
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multiple choice question reversible reactions usually exist in a state …
the ratio of products to reactants is stable
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multiple choice question a chemical reaction in which a larger molecule…
D. Decomposition
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multiple choice question the law of mass action says that reactants pro…
A. greater; lesser
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select all that apply in chemical reactions, chemical bonds are _. □ br…
broken, formed
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which of the following describes a reversible reaction? a combines with…
A. A combines with B and becomes AB, but when AB is heated, it becomes A and B again.
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multiple choice question which type of reaction occurs when two molecul…
B. Exchange
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multiple choice question how is chemical energy defined? potential ener…
Potential energy stored in the bonds of molecules
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multiple choice question. the energy of motion is what type of energy? …
D. Kinetic
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fill in the blank question a large molecule breaks down into two or mor…
decomposition
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true or false question a chemical reaction is a process in which a cova…
True
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select all that apply which of the following are used to express concen…
A. Percentages C. Weight per volume D. Molarity
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multiple choice question chemical energy is stored in _. o electrolyte …
bonds of molecules
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multiple choice question which of the following is a definition of ener…
The capacity to do work
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multiple choice question milliequivalents per liter is used to express …
C. electrolyte
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multiple choice question name the measure of concentration that takes i…
Molarity
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multiple choice question which of the following would give you the mola…
O Moles/liter
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fill in the blank question weight per volume, percentages, and molarity…
concentration
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multiple choice question solution a prevents solution c from changing i…
A. Buffer
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multiple choice question one millimole of nacl is dissolved in a liter …
1 mEq/L (corresponding to the option "1 mEq/L")
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which term applies to a solution with a ph of 7.0? o basic o acidic o n…
C. Neutral
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molarity is a measure of the number of moles of solution per ________. …
A. liter of solution
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multiple choice question solution a has a ph of 2. it is basic acidic n…
B. acidic
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one mole of a chemical is the number of grams equal to its ______. perc…
O molecular weight
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multiple choice question which reflects the weight of a solute in a sol…
Weight per volume
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fill in the blank question a solution with a ph above 7 is
basic (or alkaline)
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fill in the blank question substances that resist changes in ph are kno…
buffers
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multiple choice question a base is a compound that acts as a proton acc…
A. acceptor
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fill in the blank question a neutral solution has a ph of. need help? r…
7
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fill in the blank question a proton (h⁺) donor, or a chemical that rele…
acid
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fill in the blank question solutions with a ph below 7 are
acidic
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multiple choice question which is an example of an emulsion? o sand in …
Fat in breast milk
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a ph of 7.5 is considered to be which of the following? neutral basic a…
Basic
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multiple choice question which is an example of a colloid? salt water s…
Gelatin desserts
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multiple choice question naoh is a compound that releases hydroxide ion…
base
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multiple choice question albumin in blood plasma is an example of a col…
colloid
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multiple choice question hcl is a compound that releases hydrogen ions …
B. acid
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multiple choice question in a solution, the solute _______, when the so…
will not separate from the solvent
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multiple choice question what term is used to describe a suspension of …
D. Emulsion
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please read the below paragraph carefully, then answer the questions. j…
1. He forgot the baking soda needed for his experiment 2. Resourceful
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multiple choice question in a solution, the solute can be a _. o liquid…
gas, solid, or liquid
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which of the following is an example of a suspension? o blood cells in …
Blood cells in blood plasma
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fill in the blank question saltwater is a solution of nacl dissolved in…
solvent
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fill in the blank question a chemical mixture containing particles that…
colloid
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reading comprehension section please read the below paragraph carefully…
He forgot the baking soda needed for his experiment
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fill in the blank question the amount of energy required to raise 1 g o…
calorie
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multiple choice question which term refers to molecules that dissolve i…
C. Hydrophilic
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multiple choice question which term defines a substance that consists o…
A. Solution
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multiple choice question what term can be used to describe any molecule…
B. Hydrophobic
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fill in the blank question saltwater is a solution made out of nacl (sa…
solute
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multiple choice question in a solution, the solvent is _______ the solu…
more abundant than
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multiple choice question substances in a mixture are ________. o chemic…
B. physically blended together
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multiple choice question which type of bond listed below is the weakest…
C. Van der Waals forces
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multiple choice question sugar is an example of a ______ substance. hyd…
hydrophilic
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multiple choice question which type of bond can be described as a weak …
B. Hydrogen
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fill in the blank question hydrophobic means that a substance is insolu…
water
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multiple choice question in a carbon dioxide molecule, electrons are sh…
Nonpolar covalent
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the most common problem with plumbing fixtures is poor pressure poor fl…
1. E. leaks 2. B. failure at welded overflow connections
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multiple choice question the ability of water to dissolve other chemica…
A. solvency
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multiple choice question which of the following best describes a covale…
Sharing of electrons between two atoms
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multiple choice question salt on a watermelon is an example of a ○ elem…
C. mixture
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fill in the blank question a chemical bond that involves the attraction…
ionic
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multiple choice question which term refers to an attractive force cause…
D. Chemical bond
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multiple choice question water molecules are weakly attracted to each o…
A. hydrogen
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good plumbing fixtures have all of the following features except smooth…
1. B. porous 2. B. they have a dedicated hot water heating system
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multiple choice question hydrogen has an atomic weight of 1amu and oxyg…
18amu (corresponding to the last option in the multiple - choice list)
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multiple choice question what term refers to a covalent bond in which t…
B. Polar
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multiple choice question glucose and fructose both have the chemical fo…
Isomers
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if each whole number on the ph scale indicates a tenfold change in acid…
Water with a pH of 2 is 1000 times more acidic than water with a pH of 5.
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multiple choice question which type of bond is formed by the sharing of…
B. Covalent
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select all that apply which of the terms below can be applied to glucos…
C. Compound D. Molecule
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multiple choice question which type of chemical bond involves the excha…
B. Ionic
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true or false question a molecule may be composed of one element or mor…
True
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fill in the blank question covalent, ionic, and hydrogen are examples o…
chemical
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fill in the blank question adding together the atomic weights of all at…
molecular
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fill in the blank question molecules with the same molecular formula bu…
isomers
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which are examples of electrolytes? salts glucose bases acids need help…
A. Salts C. Bases D. Acids
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multiple choice question which term can apply to a molecule composed of…
B. Compound
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what is the term for an ion with a net negative charge (more electrons …
A. Anion
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multiple choice question atoms that make up molecules ______. o must be…
O may be identical or different
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multiple choice question unstable isotopes are called _. isomers neutro…
C. radioisotopes