化學
化學反應、化學計量、分子結構與元素性質。
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which particle - diagram shown above best represents the strongest inte…
A. Diagram 1, because it shows hydrogen bonds forming between hydrogen atoms from different ethanol molecules.
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the calibration is to the 2 ml, so we do not estimate another place val…
36 mL
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which particle - diagram shown above best represents the strongest inte…
C. Because it shows the formation of a hydrogen bond between an O atom with an O atom bonded to an H atom from another molecule.
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to what place value can you estimate the volume in a beaker having a ca…
the tenths place
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suppose you have a graduated cylinder with a calibration of 1 ml. how p…
to the nearest 1 milliliter
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suppose you have a graduated cylinder with a calibration of 1 ml. how p…
to the nearest 1 milliliter
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suppose you have a graduated cylinder with a calibration of 10 ml. how …
to the nearest 1 milliliter
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7. which of the following models the relative amount of energy or matte…
C. ecological pyramid
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fill in the systematic names of the following chemical compounds. note:…
| molecular formula | name of compound | | ---- | ---- | | SiO | Silicon monoxide | | SO₂ | Sulfur dioxide | | SiO₂ | Silicon dioxide | | SO₃ | Sulfur trioxide | | NH₃ | Ammonia |
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chemical bonds form when atoms share valence electrons or when one atom…
- Oxygen atoms tend to gain or share electrons when forming chemical bonds. - Atoms with three or fewer valence electrons tend to lose electrons when forming chemical bonds. - Mag…
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note: to answer some of the questions, it may help to reference a perio…
C. an ionic bond between positive lithium ions and negative chlorine ions D. an ionic bond creating a compound in a crystal lattice formation
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which statement best describes the rhythm of \song of myself\? the poem…
The rhythm is very similar to the rhythm of everyday speech
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periodic table basics 1. which elements had complete outer shells? give…
Hydrogen - H, Lithium - Li, Sodium - Na 2.
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bj: printer characteristics use the information below to answer the que…
The SLS and Material Jetting machines
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bj: post - processing. use the information below to answer the question…
a bronze infiltration
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archaeologists dont discover historical artifacts made from plant - bas…
A. The geology of the cave
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the synthesis of novel superheavy elements, such as nihonium (nh), has …
C. It provides details about the qualification later in the sentence regarding the prospect of cataloging the full range of possible chemical compounds.
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part b when carbon is burned in air, it reacts with oxygen to form carb…
96.8 g
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40 multiple choice 1 point what is the first reaction in the alarm resp…
The brain receives a danger signal.
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2. you are an astronaut on a malfunctioning rocket! you accidentally ej…
i. Thermosphere; Threat: Lack of oxygen and extreme cold. ii. Ionosphere; Threat: High - energy radiation. iii. Mesosphere; Threat: Extremely low temperatures and lack of oxygen. …
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2. you are an astronaut on a malfunctioning rocket! you accidentally ej…
Thermosphere
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7 0/1 point select the appropriate choice that describes the molecule s…
polar
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select the appropriate choice that describes the molecule shown below. …
polar
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2 0/1 point select the appropriate choice that describes the molecule s…
We need the actual options with descriptions to provide a specific answer. As it stands, we know the current selection of "nonpolar" is incorrect according to the red cross, but w…
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how does therapy help in the treatment of depression? a changes negativ…
A. changes negative thinking patterns
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chapter 12 test: matter, properties and changes total questions: 24 wor…
1. c) chemical property 2. b) ability to be crushed 3. b) density 4. d) mass and volume 5. a) soluble in water 6. b) ability to react with oxygen 7. c) flammability
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what two states are pictured in this image? a) gas and solid b) volume …
a) gas and solid
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16. match the substance with the state of matter ice cubes a) liquid c)…
16. b) solid 17. a) solid 18. a) gas 19. b) liquid 20. b) burning 21. b) burning paper 22. a) frying a hamburger 23. c) light
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8. the rusting of iron is not a physical property because a) iron is ma…
8. c) a new substance with new properties formed 9. a) gas 10. a) displacement 11. b) the wall was blue 12. c) orange juice being made from fresh oranges 13. a) plant making food …
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8. which state of matter has a very weak attractive force between parti…
8. a. gas 10. a. displacement 11. b. the wall was blue 12. b. leaves changing colors in the fall, c. orange juice being made from fresh oranges 13. a. plant making food out of wat…
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chapter 12 test: matter, properties and changes total questions: 24 wor…
1. c) chemical property 2. b) ability to be crushed 3. b) density 4. d) mass and volume 5. a) soluble in water 6. b) ability to react with oxygen 7. c) flammability
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multiple - choice question c₆h₁₂o₆ is the chemical formula for all of t…
A. Starch
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prefixes and suffixes are important in science to help understand the m…
B. round, 3 - dimensional object
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which of these is most closely related to traditional agriculture and n…
the use of human or animal muscle power
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how should chemical pesticides be used in integrated pest management? a…
C. sparingly, with the aim of controlling pests
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1. multiple choice which of the following elements is in the same group…
B. Potassium (K) # 2.
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practice: 1. identify the correct family. 2. explain the reasoning base…
| Element Description | Family? | Why? | | ---- | ---- | ---- | | Barium (Ba) - a reactive metal used in medical imaging and fireworks | Alkaline - earth metals | Has 2 valence el…
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practice: 1 identify the correct family 2 explain the reasoning based o…
1. B. Potassium (K) 2. They have the same number of valence electrons. 3. C. They have the same number of valence electrons 4. Chlorine and iodine are both in Group 17 (halogens) …
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valence electrons directions: determine how many valence electrons each…
Si: 4 Be: 2 B: 3 F: 7 Na: 1 P: 5 Mg: 2 He: 2 N: 5 Cl: 7 Al: 3 Li: 1 Ge: 4 Ca: 2 Rb: 1 Se: 6
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directions: label the diagram below and place the charge next to each i…
1. Beryllium (Be) 2. 4 3. Group 2 4. Period 2 5. Yes, alkaline - earth metal
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name: exit ticket sc.8.p.8.5 which compound is formed when magnesium (m…
1. A. MgO 2. C. $CaCl_{2}$ 3. A. R1
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decide whether each chemical reaction in the table below is an oxidatio…
For $CO(g)+H_2O(g)\to CO_2(g)+H_2(g)$: redox reaction? yes reducing agent: $CO$ oxidizing agent: $H_2O$ For $Fe(s)+CuSO_4(aq)\to FeSO_4(aq)+Cu(s)$: redox reaction? yes reducing ag…
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decide whether each chemical reaction in the table below is an oxidatio…
For $2N_2(g)+5O_2(g)\to2N_2O_5(g)$: redox reaction? yes reducing agent: $N_2$ oxidizing agent: $O_2$ For $FeO(s)+CO(g)\to Fe(s)+CO_2(g)$: redox reaction? yes reducing agent: $CO$ …
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decide whether each chemical reaction in the table below is an oxidatio…
For $\mathrm{HSO}_{4}^{-}(aq)+\mathrm{OH}^{-}(aq) ightarrow\mathrm{SO}_{4}^{2 -}(aq)+\mathrm{H}_{2}\mathrm{O}(l)$: redox reaction? no reducing agent: N/A oxidizing agent: N/A For …
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classify each chemical reaction: reaction type of reaction (check all t…
1. double replacement, acid - base 2. decomposition 3. double replacement, acid - base 4. combustion
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set solvent water (polar) oil (non - polar) interact with molecules mov…
The hydrophilic heads orient themselves towards the inside of the micelle.
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classify each chemical reaction: reaction type of reaction (check all t…
1. combustion 2. double replacement, acid - base 3. decomposition 4. combination
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classify each chemical reaction: reaction type of reaction (check all t…
$2H_2O(g)\to2H_2(g)+O_2(g)$: decomposition $HBr(aq)+NaOH(aq)\to NaBr(aq)+H_2O(l)$: double replacement, acid - base $2CH_3(CH_2)_2CH_3(g)+13O_2(g)\to8CO_2(g)+10H_2O(g)$: combustion…
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solid iron reacts with aqueous copper(ii) sulfate (cuso₄) to produce so…
$Fe(s)+CuSO_4(aq) ightarrow Cu(s)+FeSO_4(aq)$
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oxygen gas reacts with nitrogen monoxide gas to produce nitrogen dioxid…
$O_2(g)+2NO(g) ightarrow 2NO_2(g)$
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solid magnesium hydroxide decomposes into solid magnesium oxide and gas…
$Mg(OH)_2(s) ightarrow MgO(s)+H_2O(g)$
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balance the chemical equation below using the smallest possible whole n…
$2CH_3CH_3(g)+7O_2(g) ightarrow4CO_2(g)+6H_2O(g)$
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identify: tetrasaccharide a disaccharide polysaccharides monosaccharides
Monosaccharides
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identify: tetrasaccharide polysaccharide monosaccharide disaccharide
Tetrasaccharide
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balance the chemical equation below using the smallest possible whole n…
$CH_4(g)+2O_2(g) ightarrow CO_2(g)+2H_2O(g)$
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balance the chemical equation below using the smallest possible whole -…
$CH_3(CH_2)_5CH_3(l)+11O_2(g) ightarrow7CO_2(g)+8H_2O(g)$
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balance the chemical equation below using the smallest possible whole n…
$P_4(s)+3NaOH(aq)+3H_2O(l) ightarrow3PH_3(g)+Na_2HPO_3(aq)$
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all carbohydrates are made up of carbon, hydrogen, and oxygen atoms. tr…
True
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based on this virtual experiment, what color do starches (carbohydrates…
B. dark blue - black
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what color indicated that proteins were present in a substance when a c…
D. purple
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what is the chemical indicator that is used to test for starches (carbo…
A. iodine
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question 1 (4 points) (02.01 mc) the slight negative charge at one end …
A. A hydrogen bond
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27. which statement best explains why different elements give off diffe…
C. Because each element has a unique arrangement of electrons and energy levels
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25. if the half - life of radon is 3.8 days and you start with 100 atom…
A. 25
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22. differences in which subatomic particles are responsible for ions a…
22. B. Ions → electrons, Isotopes → neutrons 23. C. 10.8 amu
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20. why is the atomic mass of chlorine 35.45 amu instead of 35.00 amu? …
20. A. Presence of isotopes with different masses 21. A. 17 p, 20 n, 17 e
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18. which is the correct ending for nitrogens orbital diagram? * 4 poin…
A. 2p³ (three half - filled orbitals)
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16. which orbital has the highest energy?* orbital energy levels and su…
D. 3d
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15. what does hund’s rule (the bus rule) state? * before any orbital is…
B. Electrons occupy orbitals singly before pairing.
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12. which list shows the first 7 sublevels that fill with electrons? * …
A. 1s, 2s, 2p, 3s, 3p, 4s, 3d
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if the ph of a solution is 3.9, what would the poh be? a. 10.1 b. -3.9 …
A. 10.1
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question 8 of 10 what is ph? a. a level of dissolved gases that are in …
C. A measurement indicating how acidic a solution is
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question 7 of 10 what property is used to calculate the ph of a solutio…
B. The hydrogen ion concentration in mol/L
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6. which is the correct orbital diagram for sulfur (electrons = 16)? * …
B. Ends with 3p⁴ (two orbitals paired, one single)
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how are ph and poh related? a. ph = poh - 14 b. poh = 14 + ph c. ph = 1…
D. pOH = 14 - pH
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a swimming - pool worker wants the pools ph to be 7.2. she comes by to …
D. Add base
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what is the poh of a solution with oh⁻ = 2.0 × 10⁻²? a. 3.01 b. 1.70 c.…
B. 1.70
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question 3 of 10 what is the ph of a solution with h+ = 7.0 × 10^(-12)?…
A. 11.15
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question 2 of 10 what do acids and bases have in common? what do acids …
C. They are both corrosive and can burn skin.
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question 1 of 10 what is the ph of water? a. -7 b. 1×10⁻⁷ c. 1×10⁷ d. 7
D. 7
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what kind of solution would have a $k_b$ value that is much greater tha…
C. A strongly basic solution
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question 9 of 10 which of the following is a strong base? a. caco₃ (cal…
B. NaOH (sodium hydroxide)
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question 7 of 10 what is always true of a strong acid? a. it has more t…
D. It dissociates completely in solution.
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question 6 of 10 what happens when an acid dissolves? a. it is no longe…
B. $H^+$ increases in solution.
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question 4 of 10 what is $k_b$ for $c_5h_5n(aq)+h_2o(l) ightleftharpoon…
C. $\frac{[C_5H_5NH^+][OH^-]}{[C_5H_5N]}$
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question 3 of 10 what is $k_a$ for $h_3bo_3(aq)=h^+(aq)+h_2bo_3^-(aq)$?…
B. $K_{a}=\frac{[H^{+}][HBO_{3}^{2 - }]}{[H_{2}BO_{3}^{-}]}$
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question 2 of 10 which of the following is an acid? a. lioh (lithium hy…
C. $H_2SO_4$ (Sulfuric acid)
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question 1 of 10 what is the difference between a strong base and a wea…
B. A strong base produces more ions in solution than a weak base.
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what is $k_{eq}$ for the reaction $n_2 + 3h_2 ightleftharpoons 2nh_3$ i…
C. $K_{eq}=1.125$
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what happens if more product is added to a system at equilibrium? a. mo…
A. More reactants will form.
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what is the equilibrium constant for the reaction so₂(g) + no₂(g) ⇌ so₃…
D. \(K_{eq}=\frac{[SO_3][NO]}{[SO_2][NO_2]}\)
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7) match the descriptions with the black inventors. the chemical engine…
1. Norbert Rillieux 2. Mary Kenner 3. Sarah E. Goode 4. Sarah Boone 5. Jan Ernst Matzeliger
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question 5 of 10 which of the following choices is the equilibrium cons…
C. $K_{eq}=\frac{[products]}{[reactants]}$
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question 4 of 10 which describes two phases in dynamic equilibrium? a. …
D. The total number of molecules in each phase stays constant.
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elijah mccoys 57 patents included the automatic lubricator for railroad…
the real McCoy
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question 5 of 10 how can the effect of heat on a reaction be determined…
A. Heat is treated as a reactant or a product.
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question 2 of 10 what is true of dynamic equilibrium? a. the total amou…
D. All the changes to a system cancel out.
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question 1 of 10 what would happen if no were added to n₂(g) + o₂(g) ⇌ …
B. More $N_2$ and $O_2$ would form.
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12. as you move the cursor over the elements, you should see the correc…
1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁴
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question 7 of 10 sound molecules can \stack up\ in front of airplanes t…
C. Sonic booms