化学
化学反应、化学计量、分子结构与元素性质。
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multiple - choice question an aqueous solution: has a low ph has water …
C. has water as its solvent
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drag and drop the correct answer choice to each answer blank. or, touch…
- "Usually found in less developed countries, and the production of food is for the farmer's immediately family." → subsistence agriculture - "Grow crops and raise livestock in la…
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text 1 chemically analyzing bulk rock - core samples from australias mo…
B. Is the increase in Mo in that portion indicative of an increase in atmospheric oxygen dating to the same time?
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ha ha ha! true or false - evaporation is literally like watching paint …
True
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14 which intermolecular forces come from permanent bond dipoles? (selec…
B. Hydrogen Bonding, C. Dipole Interactions
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determine if the following salt is neutral, acidic or basic. if acidic …
NR
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what is the ph of a 0.500 m solution of nacn (kₐ of hcn is 4.9×10⁻¹⁰)?
\(11.51\)
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question 5 of 5 match each branch of science with a related career. spa…
Space science - Astronaut Earth science - Geophysicist Physical science - Chemist Life science - Botanist
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a solution is made by dissolving 35.5 g of ba(no₂)₂ in 500.0 ml of wate…
\(8.57\)
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a solution is made by dissolving 35.5 g of ba(no₂)₂ in 500.0 ml of wate…
\(2.2\times10^{-11}\)
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11 water is an example of a molecule with high surface because it has s…
Water is an example of a molecule with high surface tension because it has strong intermolecular forces. Methane (\(CH_4\)) is an example of a molecule with low surface tension be…
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10 the stronger the intermolecular force, the higher the melting point.…
A. True
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use the data to determine the strength of intermolecular forces present…
| | Strength of Intermolecular Force | |--|--| | Unknown 1 | medium | | Unknown 2 | high | | Unknown 3 | low | | Unknown 4 | very high |
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scroll down to metals vs. non-metals 18. list three physical properties…
18. High electrical conductivity, high thermal conductivity, malleable. 19. Low electrical conductivity, low thermal conductivity, brittle. 20. Silicon (\(Si\)).
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which chemical formula represents a polyatomic ion? (1 point) na+ nacl …
$\ce{ClO-}$
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based on patterns in the periodic table, which ion has a stable valence…
potassium (K) with a \(1^{+}\) charge
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which statement best explains why the elements in group 18 do not have …
The elements have filled valence levels.
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which quantity determines how two atoms bond? (1 point) the difference …
the difference in their electronegativities
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how would the electron configuration of nitrogen change to make a stabl…
It would gain three electrons.
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a solution is made by dissolving 35.5 g of ba(no₂)₂ in 500.0 ml of wate…
\(NO_{2}^{-}(aq)+H_{2}O(l) ightleftharpoons HNO_{2}(aq)+OH^{-}(aq)\)
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what types of intermolecular forces can water molecules experience? sel…
B. London Dispersion Forces, C. Hydrogen bonds, D. Dipole - dipole
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match the structural formula to the chemical formula for this substance…
\(C_{2}H_{6}O_{2}\)
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match the structural formula to the chemical formula for this substance…
\(CH_{2}Cl_{2}\)
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match the structural formula to the chemical formula for this substance.
\(C_{2}H_{6}O\)
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atomic radius as you move across a period, the atomic radius __________…
- **Atomic Radius**: - Across a period: Decreases; because protons increase (same energy level), nuclear charge pulls electrons closer. - Down a group: Increases; because new ener…
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37) the pharynx functions as a passageway for, whereas the larynx funct…
37) B. air and food; air only 38) false 39) C. Synthesis of plasma proteins 40) B. A renal corpuscle and a renal tubule 41) D. Loss of the ability to detect sodium, potassium, and…
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what do these organic compounds have in common? methane (ch₄ ) butane (…
They contain both carbon and hydrogen.
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use the drop - down menus to identify each substance as an organic or i…
ozone (\(O_3\)): inorganic compound methane (\(CH_4\)): organic compound aluminum hydroxide (\(Al(OH)_3\)): inorganic compound butane (\(C_4H_{10}\)): organic compound carbon mono…
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name: date: naming lonic and polyatomic compounds worksheet part i: dir…
1. Sodium chloride 2. Magnesium oxide 3. Calcium bromide 4. Aluminium oxide 5. Lithium sulfide 6. Potassium nitride 7. Barium fluoride 8. Iron(III) chloride 9. Copper(I) oxide 10.…
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read the poem \monets waterlilies\ by robert hayden. today as the news …
- There is no rhyme scheme. - The lines are unequal in length.
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what are the characteristics of carbon bonds? check all that apply. ins…
insoluble in water, covalent bonding, slow reaction rate, high activation energies to begin reactions
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the rhyme pattern that occurs at the ends of lines in poetry is called …
a rhyme scheme.
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what are the characteristics of fixed poetry? select three options. a r…
a regular rhyme scheme, lines of equal length, a set number of lines
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two hydrogen atoms interact to form a hydrogen molecule. classify the f…
- **Attractive force is predominant between the two atoms**: The two hydrogen atoms start to combine to form a hydrogen molecule, The two hydrogen atoms approach each other to for…
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16 multiple choice 1 point which biogeochemical cycle is not a nutrient…
water
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13 multiple choice 1 point when an element falls out of use in a biogeo…
sink
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a substance is placed in a closed vessel. the substance is continuously…
First particle representation: Region 1; Second particle representation: Region 2; Third particle representation: Region 3; Fourth particle representation: Region 4; Fifth particl…
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a substance is placed in a closed vessel. the substance is continuously…
First particle representation: 1; Second particle representation: 2; Third particle representation: 3; Fourth particle representation: 4; Fifth particle representation: 5.
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a substance is placed in a closed vessel. the substance is continuously…
2, 4
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a substance is placed in a closed vessel. the substance is continuously…
Region 5
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a substance is placed in a closed vessel. the substance is continuously…
- A mixture of solid and liquid: 2 - A mixture of liquid and gas: 4 - A mixture of solid and gas: None (or no region in this heating curve)
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a substance is placed in a closed vessel. the substance is continuously…
- Only solid present: 1 - Only liquid present: 3 - Only gas present: 5
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a substance is placed in a closed vessel. the substance is continuously…
Region 1
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a substance is placed in a closed vessel. the substance is continuously…
1, 3, 5
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mannerist artists, in expressing their answer often favor answer answer…
individualism, colors that clash, ambiguous
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are the most organized state of matter. a solids b liquids c gases stat…
1. A. Solids 2. B. Energy 3. C. Gases (assuming the third option in the third question is Gases as it's the state with most particle movement)
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which term means \stopping bleeding\? thrombosis hemoglobin hemostasis …
hemostasis
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is a signal word one of the required pieces of information to be includ…
Yes
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a safety data sheet (sds) includes information on the properties of a c…
Physical and health hazards
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what type of energy drives this cycle on earth? o chemical energy o mec…
thermal energy
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howard has a chemical burn from accidentally spilling a strong basic cl…
A. Acute
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bellwork: claim, evidence, reasoning instructions: complete part a (cer…
## Part A 1. The grading scale is unfair. 2. The student had the best ideas (content) in the class. 3. Since content (ideas) is more important, it should be weighted more (90% ins…
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your employer gives you a list of all the chemicals in the entire build…
B. No
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is the product identifier one of the required pieces of information to …
Yes
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bellwork: claim, evidence, reasoning instructions: complete part a (cer…
1. Claim: La escala de calificación es injusta y el contenido debería ponderarse 90%. 2. Evidence: "Tuve las mejores ideas en la clase" (componente de contenido). 3. Reasoning: As…
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your employer is required to develop, implement, and maintain a written…
Safety training on all chemicals present
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hurricanes are driven by the energy they get from ocean water. which pr…
high specific heat
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atomic mass practice 1. which isotope of copper is more abundant: coppe…
\(10.81\) amu
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which of these is a property of water that allows it to transport mater…
It dissolves many substances.
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atomic mass practice 1. which isotope of copper is more abundant: coppe…
The atomic mass of element \( X\) is approximately \( 10.81\) amu.
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ice molecules take up more volume than liquid water molecules. which of…
Water molecules solidify near the surface and float on the liquid water.
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one characteristic that is unique to water is that it exists naturally …
exists naturally in three states on Earth.
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in the below mentioned phase diagram of water, the curve oc shows the e…
a. TRUE
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in the phase diagram shown here: the line oc is almost vertical because…
a. TRUE
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looking at the hard, plaster cast that extended from her hand to her sh…
Jillian groaned for the billionth time. She couldn't believe that—in a split second—she had broken her arm in two places and had ruined her chances of becoming the leading scorer …
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the critical pressure is the pressure that must be applied to the gas a…
B. Critical temperature
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molar mass worksheet calculate the molar masses of the following chemic…
1. \(70.90\space g/mol\) 2. \(56.11\space g/mol\) 3. \(79.91\space g/mol\) 4. \(162.20\space g/mol\) 5. \(67.81\space g/mol\) 6. \(120.91\space g/mol\) 7. \(58.33\space g/mol\) 8.…
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in the phase diagram of water, at high pressure, the solid and liquid b…
a. TRUE
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raquel lindell looking at the hard, plaster cast that extended from her…
Contributes to the mood: passes, points, free throws; engrossed; incredible steal; practice uniform; wooden bench. Does not contribute to the mood: impressive notes.
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the i point is the highest temperature at which the substance can possi…
critical
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what is different about the general structure of the phase diagram for …
B. The slope of the line between solid and liquid is negative.
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when the following two solutions are mixed: k₂co₃(aq) + fe(no₃)₃(aq) th…
- Spectator ions: \(K^{+}(aq)\), \(NO_{3}^{-}(aq)\) - Ions that react: \(Fe^{3+}(aq)\), \(CO_{3}^{2 -}(aq)\)
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a volume of 100 ml of 1.00 m hcl solution is titrated with 1.00 m naoh …
- **Before equivalence point**: \(10.0\ mL\) of \(1.00\ M\ NaOH\), \(5.00\ mL\) of \(1.00\ M\ NaOH\), \(50.0\ mL\) of \(1.00\ M\ NaOH\) - **At equivalence point**: \(100\ mL\) of …
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12 multiple choice 2 points look at the table below. selected items tra…
Saudi Arabia and the United States are interdependent.
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complete the sentences. move the correct answers to the boxes. in a car…
First box: chemical; Second box: kinetic (or mechanical); Third box: thermal (or heat)
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your chemistry teacher conducts a lab where you launch a coca - cola bo…
The maximum height that the rocket reaches is \(18\) units.
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part 5: ph scale 1. the ph scale measures the concentration of ______ i…
1. hydrogen ($H^{+}$) 2. 0; 14 3. acidic 4. basic (alkaline) 5. neutral 6. acidic 7. basic (alkaline) 8. pH meter; pH - indicator
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part 2: the five types of chemical reactions 1. synthesis - two or more…
1. one; \(H_2O\) 2. products; \(O_2\) 3. \(H_2\) 4. ions 5. \(O_2\); \(CO_2\); \(H_2O\); \(H_2O\)
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multi - step molar conversions show your work. include units round fina…
The final answer (rounded to 3 sf with units) is \(3.38\ g\) ### Problem 2
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student study guide - chemical reactions & acids/bases part 1: chemical…
1. substances 2. created; destroyed 3. reactant; product 4. coefficients 5. atom 6. coefficients 7. \(2\); \(1\); \(2\) 8. gas production; precipitate formation; color change; tem…
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complete este cuestionario para finalizar la área de química moderna qu…
Todos tienen la misma densidad.
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instrucciones: elige una respuesta y pulsa \siguiente\. recibirás tu pu…
Densidad = masa / volumen
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completar este cuestionario para finalizar la tarea de química moderna …
3,49 kilogramos
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what solution turns litmus paper blue? neutral none basic acidic
C. basic
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a solution that has a high concentration of hydrogen ions has what type…
2
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which of these is a base? ○ vinegar ○ hcl ○ hno₃ ○ ammonia
ammonia
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identify the rhyme scheme and tone of this excerpt from a poem. i plann…
B. AABB; playful and humorous
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an unknown solution has a ph of 2. how would you classify this solution…
acidic
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which of these is a property of acids? they feel slippery. they turn li…
They produce hydrogen gas when reacted with metals.
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part 3: acids 1. an acid is a substance that produces _ ions (h+) in so…
1. hydrogen; $Cl^{-}$ 2. hydronium 3. sour; electricity; corrosive 4. red 5. citrus; car
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part 4: bases 1. a base is a substance that produces _ ions (oh-) in so…
1. hydroxide 2. negatively 3. 1. slippery 2. bitter 3. caustic 4. blue 5. detergents 6. ammonia
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complete este cuestionario para finalizar la tarea de química moderna q…
3,49 kilogramos
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match these poetry terms with the correct definition. the pattern of en…
1. rhyme scheme 2. metaphor 3. simile 4. tone 5. personification 6. alliteration 7. stanza
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when should you wear ppe to protect yourself from chemical hazards? sel…
Whenever chemical hazards are present
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violet has noticed that shes been feeling sick around one of the chemic…
Yes
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1. quelle est la concentration (%) en alcool sil y en a 32 ml de dissou…
La concentration en alcool est d'environ \(15.24\%\) 2.
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how did sister simplice help jean valjean? a. she gave him a chemise an…
C. She told Javert two lies when he came looking for Valjean.
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a organic lines b geometric lines c modular lines d balanced lines
b. Geometric Lines
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question 5 (20 points) this is an example of what type of lines? o a ge…
c. Organic Lines
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classifying matter match the following vocabulary terms to their defini…
1. Quantitative 2. Matter 3. Qualitative