化學
化學反應、化學計量、分子結構與元素性質。
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question 1 ions are generated as a result of atoms gaining or donating …
A. A sodium ion B. A calcium ion
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what process changes one set of chemicals into another? stimulus and re…
B. chemical reaction
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multiple choice question what is used to indicate the relative acidity …
A. The pH scale
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what are the elements or compounds that go into a chemical reaction cal…
reactants
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question which of the following is synonymous with the type of chemical…
B. Hydrolysis C. Decomposition reaction D. Catabolism
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during any chemical equation such as photosynthesis, how many of the re…
all of them
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question the mass number of an atom is defined as the ____________ answ…
number of protons plus the number of neutrons in the nucleus
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review math skills: 1. report the number of sigfigs: 600. 2.30×10⁵ 2.30…
1. - $2.30\times 10^{5}$: 3 sig - figs - $2.3000$: 5 sig - figs - $30000$: 1 sig - fig - $600.$: 3 sig - figs - $650$: 2 sig - figs - $320.0$: 4 sig - figs - $0.0010$: 2 sig - fig…
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multiple choice question substances that release hydroxide ions or take…
A. Bases
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multiple choice question any solution with a ph less than 7 is o a base…
an acid
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what is the answer, with the correct number of decimal places, for this…
109.30 g
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5 of 10 concepts completed fill in the blank question a is a chemical o…
buffer
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drag and match determine which of the following bonds are the weakest, …
Strongest: Ionic bonds Weakest: Hydrogen bonds Average strength: Covalent bonds
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if the second energy level of an atom has one electron, how many more e…
D. Seven
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question the smallest stable units of matter are called ____________. a…
C. atoms
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question① select the correct answer. a typical atom is made up of neutr…
By having different number of neutrons
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question 4 of 10 what character would be the best example of an archety…
B. A stubborn police officer who seeks justice
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multiple choice question the lower the ph, the more ______ the solution…
B. acidic
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multiple choice question molecules that are attracted to water because …
C. Hydrophilic
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question a + b > ab is an example of a(n) ____________ reaction. answer…
C. synthesis
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3 of 10 concepts completed fill in the blank question a measure of the …
pH
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multiple choice question molecules that do not dissolve in water becaus…
B. Hydrophobic
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fill in the blank question a(n) is any substance with a ph over 7.0. ne…
base
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atom a 1. how many protons are in atom a? 2. how many neutrons are in a…
1. <Number of protons in atom A> 2. <Number of neutrons in atom A> 3. <Number of electrons in atom A (equal to number of protons if neutral)> 4. <Sum of protons and neutrons in at…
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learning: chapter 02: sections 1 - 4 question what type of chemical bon…
D. Covalent bond
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question which of the following is synonymous with the type of chemical…
A. Synthesis reaction C. Anabolic reaction D. Dehydration synthesis
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drag and match match the following terms with their correct definitions…
Half - life: The time required for half of a given amount of the isotope to decay Weight: Effect of gravity on mass of an object Mass number: Total number of protons and neutrons …
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multiple choice question a molecule that contains atoms from carbon and…
C. compound
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fill in the blank question substances that dissociate in water and rele…
acids
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an atom of a particular element has a volume of $7.8\times10^{-31} m^3$…
7.8×10^(-4) nm^3
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multiple choice question a pure chemical substance consisting of two or…
B. molecule
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question 14 (1 point) what would likely happen if soil lost all of its …
Question 14: A. Plants would not grow well Question 15: D. Directly producing oxygen
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question atomic number is defined as answer the number of protons in th…
the number of protons in the nucleus
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multiple choice question molecules that contain multiple -oh groups, wh…
hydrophilic
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4. practice: chemical reactions are generally classified into five grou…
$CH_4 + 2O_2 ightarrow CO_2+2H_2O$ $2C_2H_6 + 7O_2 ightarrow 4CO_2+6H_2O$ $2KCl + F_2 ightarrow 2KF + Cl_2$ $Mg + 2HCl ightarrow MgCl_2 + H_2$ $2AgNO_3+K_2SO_4 ightarrow Ag_2SO_4 …
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why is organic matter important in soil? o a it provides minerals only …
- Question 1: b. It improves soil structure and supplies nutrients - Question 2: a. Filters and cleans water - Question 3: d. Bacteria, fungi, insects, and worms
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0 of 10 concepts completed fill in the blank question a polar molecule …
hydrophilic
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question 5 (1 point) how does soil differ from dirt? a dirt supports pl…
Question 5: C. Soil is alive with organisms, dirt is not Question 6: B. Sand Question 7: D. Anchoring roots and supplying water and nutrients
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from moons south pole is full of mystery, science, intrigue nasa has it…
2. a sense of excitement
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0 of 10 concepts completed fill in the blank question a nonpolar molecu…
hydrophobic
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0 of 10 concepts completed fill in the blank question a molecule that i…
compound
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fill in the blank question a(n) is a distinct chemical substance that r…
molecule
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which of the following is not a component of soil? o a organic matter o…
- Question 1: C. Plastic particles - Question 3: D. Organic matter - Question 4: B. Air and water
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11. what is the rhyme scheme for these lines from “trust in god, and do…
11. B. abcb 12. B. situational 13. B. World War II 14. A. Medal of Honor 15. B. Arnold Winkelried 16. A. "The Charge of the Light Brigade" 17. D. Swiss 18. A. Don Quixote 19. B. g…
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isotope abundance and atomic mass in nature, most elements occur as a m…
For the first part: The atomic mass of an element is close to the mass number of its most abundant isotope because the most abundant isotope contributes the most to the weighted -…
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question 1 (1 point) what is soil best defined as? o a decomposed leave…
B. A dynamic, living natural body of minerals, organic matter, water, air, and organisms
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directions: use the simulation and your data to answer the following qu…
1. Protons 2. Protons and neutrons 3. Protons (positive charge), electrons (negative charge) 4. Protons, neutrons, and electrons
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7. all the following are advantages of earthquakes except (4 points) co…
7. D. loss of habitat 8. B. they are fractures in the crust
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a reference isotope is an isotope whose mass can be measured accurately…
For helium - 3: Sketch a nucleus with 2 positively - charged spheres (protons) and 1 neutral sphere (neutron). Draw 2 small dots around the nucleus to represent electrons. For hel…
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isotopes all atoms of an element have the same number of protons. howev…
The overall charge of oxygen - 16, oxygen - 17, and oxygen - 18 is the same, all equal to 0. This is because in each isotope of oxygen, the number of protons (positively - charged…
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what is the atomic mass of this element
196.967
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how many neutrons does the isotope of lithium have?
5
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if the number of electrons in an atom changes it becomes a(n) _________…
A. ion
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what is a valence electron? total number of electrons electrons in the …
Electrons in the outer shell
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mass number most of the mass of an atom comes from protons and neutrons…
| Atom | Atomic number | Mass number | Protons | Electrons | Neutrons | |---|---|---|---|---|---| | $_{11}^{23}Na$ | 11 | 23 | 11 | 11 | 12 | | $_{16}^{32}S$ | 16 | 32 | 16 | 16 |…
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what is the ion formed from sulfur? s⁻² s⁺⁶ s⁻⁶ s⁺²
$S^{-2}$
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what did bohrs atomic theory model look like? a cherry pit. it had a nu…
A solar system. It had electron orbiting the nucleus like the planets around the sun.
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how is carbon - 12 different from carbon - 14? they have a different nu…
They have a different number of neutrons
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a student conducts an experiment to test how the temperature affects th…
the amount of sugar
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the periodic table there are 118 elements, all with different atomic nu…
Magnesium (Mg) and barium (Ba) are most similar because they are in the same group of the periodic table and elements in the same group tend to have similar chemical properties.
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sls: materials use the information below to answer the question. when d…
$125 per kilogram
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types of atoms atomic number an element is the simplest form of matter …
Fluorine - Number of protons: 9, Number of electrons: 9 Iodine - Number of protons: 53, Number of electrons: 53
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identify the parts below for 2 protons, 2 neutrons, & 2 electrons. ques…
Atomic Number: 2 Mass Number: 4 Protons: 2 Neutrons: 2 Electrons: 2 Charge: 0 Element Name: Helium Type of Ion: Neutral atom (not an ion)
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question 12 identify the parts below for 16 protons, 16 neutrons, & 18 …
Atomic Number: 16 Mass Number: 32 Protons: 16 Neutrons: 16 Electrons: 18 Charge: - 2 Element Name: Sulfur Type of Ion: Anion
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go online to explore and explain the makeup and properties of atoms and…
Protons and neutrons account for most of an atom's mass. The electron cloud accounts for most of an atom's volume.
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question 11 identify the parts below for carbon - 12
Atomic Number: 6 Mass Number: 12 Protons: 6 Neutrons: 6 Electrons: 6 Charge: 0 Element Name: Carbon Type of Ion: None (neutral atom)
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which element does not have the same number of electrons in its outermo…
helium (He)
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sls: materials use the information below to answer the question when de…
alumide
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potassiums atomic number is 19, and its atomic mass is approximately 39…
D. 20
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which of the following defines the atomic number of an atom? (1 point) …
the number of protons
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question 10 identify the parts below for $_8^{16}o^{-2}$
Atomic Number: 8 Mass Number: 16 Protons: 8 Neutrons: 8 Electrons: 10 Charge: - 2 Element Name: Oxygen Type of Ion: Anion
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which element has six valence electrons? (1 point) o phosphorus (p) o o…
Oxygen (O)
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which property do the elements in each column of the representative ele…
number of valence electrons
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question 9 identify the parts below for $_1^1h^{+1}$. atomic number mas…
Atomic Number: 1 Mass Number: 1 Protons: 1 Neutrons: 0 Electrons: 0 Charge: +1 Element Name: Hydrogen Type of Ion: Cation
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question 8 identify the parts below for 32 protons, 41 neutrons, & 36 e…
Atomic Number: 32 Mass Number: 73 Protons: 32 Neutrons: 41 Electrons: 36 Charge: - 4 Element Name: Germanium Type of Ion: Anion
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sls: materials use the information below to answer the question. when d…
nylon
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sls: materials. use the information below to answer the question. when …
PA - 12 nylon
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which of the following functional groups is the hydroxyl group? -po4 -s…
-OH
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question 7 identify the parts below for tin - 119 variable number atomi…
|Variable|Number| |--|--| |Atomic Number|50| |Mass Number|119| |Protons|50| |Neutrons|69| |Electrons|50| |Charge|0| |Element Name|Tin| |Type of Ion|neutral|
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answer the following. (a) a certain solution has a hydrogen ion concent…
(a) 0.000589 (b) $4.2\times 10^{5}$
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sls: materials. use the information below to answer the question. when …
carbon, glass, or aluminum
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when mixed into water, a strong acid will become a weak acid. dissociat…
B. dissociate into ions
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a(n) ______ removes hydrogen ions and a(n) ______ releases hydrogen ion…
A. base; acid
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8) identify the following sentences as simple, compound, or complex. lo…
1. Complex 2. Compound 3. Complex 4. Complex 5. Simple 6. Compound 7. Complex 8. Simple
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which has the greater concentration of hydrogen ions, a substance with …
C. A pH of 4 is greater.
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if a substance has a ph that is greater than that of water, it is a buf…
alkaline.
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a solution containing equal numbers of hydrogen ions and hydroxide ions…
D. neutral
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2.40 complete each of the following metric relationships: a. 1 mg = ___…
a. \(1\times10^{6}\) b. \(10^{3}\) c. \(10^{-3}\) d. \(10^{3}\)
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blood is an example of a colloid, suspension, solution, solute, solvent.
colloid
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a(n) ______ is a homogeneous mixture containing a solvent and a solute.…
E. solution
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which of the following statements about water is true? it has a relativ…
It is the universal solvent.
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hydrophilic molecules readily associate with water molecules. salts. hy…
water molecules.
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compounds that do not usually contain carbon and hydrogen atoms as the …
E. inorganic
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which of the following is both an anion and a compound? nacl hco₃⁻ k⁺ n…
B. $\text{HCO}_3^-$
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18/22 an atom’s valence electron shell: is filled when it has three ele…
B. determines its chemical reactivity
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which of the following is an organic compound? salts water bases carboh…
carbohydrates
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the mass number is equal to: the number of neutrons in an atom the numb…
C. the sum of protons and neutrons in an atom
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activation energy is the energy needed to start a reaction. the same as…
the energy needed to start a reaction.
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chemical reactions that yield energy, such as heat, are said to be exer…
A. exergonic
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which of the following elements has 6 electrons in its outer shell? d) …
B. Oxygen