化学
化学反应、化学计量、分子结构与元素性质。
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using the as\ idea, how many electrons are \available\ for the compound…
32
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count the significant digits in each of these measurements: - 2.0 × 10^…
\(2\), \(4\), \(2\), \(5\)
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1) calculate the atomic mass of c by using the data from carbon isotope…
- Percent abundance of \(^{13}\text{C}\): \(1.07\%\) - \(^{13}\text{C}\) mass - abundance product: \(0.13913\) - \(^{12}\text{C}\) mass - abundance product: \(11.8716\) - Atomic m…
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using the as\ idea, how many electrons are eeded\ for the compound sicl…
\(40\)
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using the as\ idea, how many bonds are made in the compound pf3? n = 32…
3
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24. calculate the atomic mass of silicon based on the following informa…
The atomic mass of silicon is \(28.1\) amu.
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using the as\ idea, how many electrons are \shared\ for the compound pf…
6
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using the as\ idea, how many electrons are \available\ for the compound…
\(26\)
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question 13 in the lewis structure for the of₂ molecule, the number of …
D. 2
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19. why is the atomic mass unit (amu), rather than the gram, usually us…
19. Atoms are extremely small, and amu is a more convenient unit for atomic - scale masses. 20. Carbon - 12; \(12\) amu. 21. False. 22. a. True; c. True. 23. a. \(35\) amu.
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what is the total number of electrons in the correct lewis dot formula …
B. 26
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which of the following correctly shows the bond polarity? chapter 4 com…
C. \(^{\delta +}\text{Br}-\text{F}^{\delta -}\)
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which of the following contains an atom (other than hydrogen) which lac…
A. \(BH_3\)
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which one of the following violates the octet rule? a nf₃ b asf₅ c cbr₄…
B. \( AsF_5 \)
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consider the bicarbonate ion (also called the hydrogen carbonate ion). …
A. two equivalent resonance forms.
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the molecular geometric shape of icl₃ molecule is best described as a t…
D. T - shaped
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which is classified as nonpolar covalent? chapter 4 compounds and their…
C. the N - Cl bond in $NCl_3$
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which of the following bonds is the most polar? a n - h b o - h c c - o…
B. \(O - H\)
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the correct dot formulation for nitrogen trichloride has: a 3 n - cl bo…
A. 3 N - Cl bonds and 10 lone pairs of electrons.
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question 5 this diagram represents the synthesis of nitrogen monoxide. …
\(N_2 + O_2 ightarrow 2NO\)
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4mg(oh)₂ 3zn(no₃)₂ 2nh₄cl c₆h₁₂o₆ chemical formula number of elements n…
| Chemical Formula | Number of elements | Number of atoms of each element | Total Number of Atoms | |---|---|---|---| | \(4Mg(OH)_2\) | \(3\) (\(Mg\), \(O\), \(H\)) | \(Mg:4\), \(…
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question 4 antoine lavoisier found that mass was conserved in chemical …
the mass of the products was the same as that of the reactants.
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1) review your observations of the behavior of the cube in each liquid.…
A. Ethylene glycol and water, B. 1 - Butanol and ethylene glycol
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the local news reports that chemical runoff from a nearby pesticide pla…
People may feel nauseous or experience dizziness following exposure to the water.
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question 2 which of these is a balanced chemical equation? 2co (g) + 2o…
Question 2: \(2CO(g)+O_{2}(g)\to2CO_{2}(g)\) Question 3: \(30\) grams
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the absorption spectrum of a certain red dye is shown above. if a stude…
A. The peak of the curve would be higher because more light would be absorbed
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multiple - choice question a polar molecule like water is not charged o…
C. has oppositely charged ends
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question 1 match each description with the term or formula given. 1. in…
1. reactants 2. products 3. products 4. reactants 5. reactants 6. products
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a student prepared four solutions of known $cu^{2+}$ and measured the a…
B. A fingerprint was left on the side of the cuvette facing the detector.
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a student is given the task of making a calibration curve for cocl₂(aq)…
C. Diluting a measured volume of the solution to a new known volume using distilled water
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an experiment was performed to investigate the reaction between zn meta…
D. \(0.45\)
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multiple - choice question an oxygen atom in water pushes electrons in …
pulls electrons in the covalent bond closer to itself
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a student prepared five solutions of cuso4 with different concentration…
D. The cuvette used for the \(0.600\ M\) solution had not been wiped clean before being put in the spectrophotometer.
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1) the polypropylene cubes have a density of 0.946 grams per milliliter…
B. The cube floats on water because the water's density is greater than the cube's density, A. The cube sinks in 1 - butanol because 1 - butanol's density is less than the cube's …
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multiple - choice question water has a bent v shape because electron ch…
electron charges repel each other
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a covalent bond forms in a water molecule between hydrogen and hydrogen…
between hydrogen and oxygen
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multiple - choice question a water molecule is made of: 1 oxygen atom a…
1 oxygen atom and 2 hydrogen atoms.
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work on the study of different gases allowed lavosier to determine that…
oxygen and hydrogen
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match the description with the correct vocabulary term. process by whic…
The process described is a. mineralization.
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balance the following equation: fe₂o₃ + al → al₂o₃ + fe select the corr…
Fe₂O₃ + 2Al → Al₂O₃ + 2Fe
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balance the following equation: c₈h₁₈ + o₂ → co₂ + h₂o select the corre…
C. \(2\mathrm{C_8H_{18}} + 25\mathrm{O_2} \longrightarrow 16\mathrm{CO_2} + 18\mathrm{H_2O}\)
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using the as\ idea, how many electrons are eeded\ for the compound pf3?…
32
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using the as\ idea, how many bonds are made in the compound sbr₂? n = 2…
\(2\)
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if a 13.9 g object has a specific heat of 1.31 j/(g°c) and it experienc…
229
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using the as\ idea, how many electrons are \shared\ for the compound sb…
\(4\)
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if a sample of water absorbs 41.0 kj of heat and the temperature of the…
315 g
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what is the temperature change of 40.0 g water if it absorbs 500.0 j en…
B. \(2.99^{\circ}C\)
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a 1.0 kg object absorbs 1,303 j of heat energy and experiences a temper…
A. \(0.39\frac{J}{g^{\circ}C}\)
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using the as\ idea, how many electrons are \available\ for the compound…
\(20\)
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using the as\ idea, how many electrons are eeded\ for the compound sbr2…
\(24\)
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using the as\ idea, how many bonds are made in the compound h₂s? n = 12…
\(2\)
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using the as\ idea, how many electrons are \shared\ for the compound h₂…
4
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using the as\ idea, how many electrons are \available\ for the compound…
\(8\)
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question when energy is converted from one form to another in a chemica…
None of the above
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the area of science that studies the heat exchange in a chemical reacti…
thermochemistry
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using the as\ idea, how many electrons are eeded\ for the compound h₂s?…
12
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when a substance undergoes a chemical reaction, which of the following …
mass
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c. why do chemists routinely test existing chemicals? (1 point)
Chemists routinely test existing chemicals to check purity, identify new properties, ensure safety, and explore new uses.
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b. name a chemical that is safe to use in food in small amounts. (1 poi…
Sodium chloride (or Citric acid etc.)
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1. what are the three main subatomic particles in an atom? o a) ions, m…
1. B. Protons, neutrons, electrons 2. C. The number of protons it has
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question 6: chemicals and safety a. name a chemical or product that was…
Lead - based paint.
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question 10 - 1 point how many carbons are there in the main chain of t…
9
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identify the name of the carboxylic acid shown below. select the correc…
2 - isopropylpentanoic acid
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reviewing vocabulary match each term with the appropriate definition. i…
ionic bond - chemical bond formed when electrons are transferred electrical force - force between two charged ions, objects, or particles polyatomic ion - ion made of two or more …
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11. which of the following is an example of real texture? a. a. sculptu…
11. A. sculpture 12. D. geometric
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when n,n - dimethylpentanamide (shown below) undergoes hydrolysis by ba…
B. dimethylamine
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identify the alcohol molecule in the ester compound butyl methanoate. s…
B. butanol
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question 1·1 point identify the correct reaction for the neutralization…
C. \( \text{HCOOH} + \text{NaOH} \to \text{HCOONa} + \text{H}_2\text{O} \)
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in 1970, a series of public policies were created to help reduce the ef…
An oil refinery directly channels chemical wastewater into surrounding man - made ditches.
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05 how many protons are in a helium atom?
\(2\)
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identify the correct statement about base hydrolysis of esters. select …
- The reactions are irreversible. - The process is saponification.
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depending upon amine nomenclature, how will you name $(ch_{3})_{4}n^{+}…
tetramethylammonium bromide
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identify the acid molecule in the ester compound ethyl methanoate. sele…
methanoic acid
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c. why is modern chemistry considered scientific? (1 point)
Modern chemistry is considered scientific as it adheres to the scientific method (observation, hypothesis, experiment, data - analysis, conclusion) using empirical evidence and lo…
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what can you infer from the name propylamine? select the correct answer…
all of the above
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what is the product of acid hydrolysis of methyl ethanoate other than m…
A. ethanoic acid
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identify the alcohol molecule in the ester compound butyl methanoate. s…
butanol
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identify the correct reaction for the neutralization of formic acid by …
C. \( \text{HCOOH} + \text{NaOH} ightarrow \text{HCOONa} + \text{H}_2\text{O} \)
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what is the unidentified product of the reaction? select the correct an…
A. \( \mathrm{CH_3 - CH_2 - CH_2 - CH_2 - CH_2 - \overset{O}{\overset{||}{C}} - OH} \)
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question what is the unidentified product of the reaction? select the c…
A. \( \text{CH}_3-\text{CH}_2-\text{CH}_2-\text{COOH} \)
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question ch₃ - ch₂ - c(=o) - nh - ch₃ + naoh → ch₃ - ch₂ - coo⁻na⁺ + wh…
\(\ce{CH3 - N - H2}\)
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what are the products of the reaction of propanoic acid with methylamin…
N - methylpropanamide and water
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question classify this amine by its degree: select the correct answer b…
tertiary amine
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prefixes and suffixes are important in science to help understand the m…
round, 3 - dimensional object
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identify the correct name of the following amine: select the correct an…
dipropylamine
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the structure below is a __________ amine. select the correct answer be…
primary (1°)
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identify the unknown product in the following acid hydrolysis of the es…
none of the above
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name: ahron jvare2 period/block: a5 make ammonia chemical equation: $n_…
- For \(N_2 + H_2 ightarrow NH_3\): - Reactant \(N\): 2, Product \(N\): 2; Reactant \(H\): 2, Product \(H\): 3. Final equation: \(1N_2 + 3H_2 ightarrow 2NH_3\) - For \(H_2O ightar…
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what are biogeochemical cycles responsible for? running water treatment…
ensuring efficient recycling in nature
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using the as\ idea, how many bonds are made in the compound cbr4? n = 4…
4
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using the as\ idea, how many electrons are \shared\ for the compound cb…
\(8\)
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complete the missing components of the products in the acid hydrolysis …
$\text{CH}_3\text{CH}_2\text{CH}_2\text{COOH} + \text{CH}_3\text{OH}$
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using the as\ idea, how many electrons are \available\ for the compound…
\(32\)
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using the as\ idea, how many electrons are eeded\ for the compound cbr4…
40
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sora lives near a farm that performs aerial pesticide spraying every mo…
take off her shoes at the door before entering her home
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write the products of the acid hydrolysis of the ester with the formula…
$CH_3COOH + (CH_3)_2CHOH$
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identify the correct statement about acid hydrolysis of esters. a. the …
B. b and c
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there are 4 shared electrons in hocl. how many bonds does this represen…
2
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what are the two groups on either side of the carbonyl in an ester? sel…
R and OR’
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using the as\ idea, how many electrons are \shared\ for the compound ho…
4