化学
化学反应、化学计量、分子结构与元素性质。
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question 9 which of the following is a characteristic of acids? a they …
A. They taste sweet. (Incorrect as acids are sour) B. They produce \(OH^-\) ions in water. (Base property) C. They feel slippery. (Base property) D. They turn litmus paper red. (A…
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question 8 strong acids completely ____ in water. the answer is ionize …
ionize
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question 7 acids taste _ and can turn litmus paper red. the answer is q…
Question 7: sour; Question 8: dissociate
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question 6 which compound is a strong base? a nh3 b h2so4 c hcl d naoh
D. \(NaOH\)
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question 4 which of the following indicates a basic solution? a h+=1×10…
D. pH greater than 7
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the ph of a solution is used to indicate the acidity of a solution and …
neutral
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question 2 what is the ph of pure water a 14 b 10 c 7 d 0
C. 7
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a concentrated solution always has a low molarity. a true b false
B. False
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2) na₂co₃(aq) + cacl₂(aq) → 2nacl(aq) + caco₃(s) calculate the volume (…
\(99.9\)
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convert the volume of calcium chloride solution required from liters to…
# Ex[SSE Completed, Client Connection Error][SSE Completed, Client Connection Error][SSE Completed, Client Connection Error][SSE Completed, Client Connection Error][SSE Completed,…
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1) in this experiment, you will be mixing aqueous solutions of sodium c…
1. Convert mass of calcium carbonate to moles of calcium carbonate 2. Compare moles of calcium carbonate to moles of calcium chloride based on balanced equation to calculate moles…
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1) what is a polyatomic ions? give deux examples 2) where are the polya…
1. Polyatomic ions are ions composed of two or more atoms covalently bonded together, acting as a single unit with an overall charge. Examples: $\text{NO}_3^-$, $\text{SO}_4^{2-}$…
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1) for each pair of reactants, will there be a reaction? zn(s) + cuso₄(…
\(Zn(s)+CuSO_{4}(aq)\): Reaction \(Zn(s)+HCl(aq)\): Reaction \(Cd(s)+H_{2}SO_{4}(aq)\): Reaction \(Ni(s)+Li_{2}CO_{3}(aq)\): No reaction
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how did the experiment with boiling water compare with the experiment i…
One involved chemical change while the other involved physical change.
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the periodic table is used to organize elements based on their properti…
The periodic table is useful as it enables quick property identification, prediction of chemical behavior, understanding of trends, and aids in applications like materials science…
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interactive review complete this section to review the main concepts of…
An element is a pure substance consisting of only one type of atom. The properties of an element are a result of the properties (such as atomic structure, electron configuration) …
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imagine that you have a sample of a substance. you cannot physically se…
A. The sample is made up of one type of atom.
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4. which properties do atoms of the same element share? select all that…
A. atomic number, B. chemical reactivity
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1) select the net ionic equation for the reaction that occurs when sodi…
\(\boldsymbol{Fe^{3 +}(aq)+3OH^{-}(aq) ightarrow Fe(OH)_3(s)}\) ### Question 2
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1) use the solubility table and classify each compound as water soluble…
- \(AgNO_3\): Water soluble - \(K_2SO_4\): Water soluble - \(Cu(OH)_2\): Water insoluble - \(Ni(NO_3)_2\): Water soluble
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question 3 of 10 boyles law of gases, states that..... the pressure of …
the volume of a gas and the pressure of a gas are inversely proportional.
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multiple choice question the central chemoreceptors respond to ______, …
hydrogen ions; carbon dioxide
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multiple choice question the ______ chemoreceptors respond to hydrogen …
peripheral
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multiple choice question the central chemoreceptors in the medulla oblo…
hydrogen ions and carbon dioxide
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multiple choice question the central chemoreceptors respond to______, n…
hydrogen ions; carbon dioxide
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multiple choice question what is directly monitored by the central chem…
pH of the brain
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multiple choice question if lactic acid builds up in the bloodstream as…
peripheral; stimulate
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multiple choice question why do normal fluctuations in blood oxygen lev…
Systemic venous blood is still 75% saturated, so oxygen is still abundant.
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multiple choice question the central chemoreceptors in the medulla oblo…
hydrogen ions and carbon dioxide
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multiple choice question control of respiration is based on input from …
B. mechanoreceptors; chemoreceptors
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multiple choice question central chemoreceptors monitor the ______ of t…
pH
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multiple choice question which term describes the amount of pressure ea…
partial pressure
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multiple choice question the receptors involved in the control of respi…
both mechanoreceptors and chemoreceptors
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multiple choice question the concentration of a specific gas in a mixtu…
partial pressure
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multiple choice question the parietal and visceral pleura are held clos…
water molecules in the serous fluid and the moist membrane surfaces
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multiple choice question attraction between water molecules in the sero…
pleurae
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14 true or false 1 point density can be represented in g/cm³ or g/ml. t…
True # 15.
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corrine walsh and colleagues tested whether soil microorganisms from ec…
C. attributed to
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in a 2020 paper, arya udry et al. cautioned that although similarities …
A. proxies for
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13. what is noble - gas notation, and why is it used to write electron …
Noble - gas notation is a shorthand for electron configurations using the symbol of a preceding noble gas. It is used to simplify the notation for elements with many electrons. ##…
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section 5.3 electron configuration in your textbook, read about ground …
1. electron configuration 2. lowest 3. stable 4. ground - state electron configuration 5. Aufbau principle 6. Pauli exclusion principle 7. spins 8. Hund's rule 9. Atomic number: 2…
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a chemist measures the energy change \\( \\delta h \\) during the follo…
\(60.2\space kJ\) (rounded to three significant digits)
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a chemist measures the enthalpy change \\( \\delta h \\) during the fol…
- \( - 108\space kJ\) - \( - 540\space kJ\) - \(324\space kJ\)
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a student dissolves 12.3 g of sodium hydroxide (naoh) in 300. g of wate…
1. exothermic 2. $13.4\space kJ$ 3. $-43.6\space\frac{kJ}{mol}$
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a 58.4 g sample of glass, which has a specific heat capacity of 0.670 j…
\(99.4^{\circ}C\)
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which phrase describes the voice of the speaker based on the word choic…
a self - confident voice that believes in connectedness to others
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a precious metal is a. an element with super and electric and thermal c…
C. an highly valuable element with super and electric and thermal conductivity, high luster, and sensitivity.
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is not only the most valuable precious metal, but it is also both aesth…
D. Gold
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which of the following is true of iron? a. it has the highest electrica…
D. It is a durable metal and is commonly used for casting.
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which of the following is not true of silver? a. it has the highest ele…
C
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a precious metal is a. an element with super and electric and thermal c…
B. a highly sought after dense, shiny, soft precious metal that has been used as money for many centuries.
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is a durable material and is widely used for casting, which is a proces…
A. Bronze
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is not only the most valuable precious metal, but it is also both aesth…
D. Gold
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which of the following is true of iron? a. it has the highest electrica…
D. It is a durable metal and is commonly used for casting.
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which of the following is not true of silver? a. it has the highest ele…
C. It is a copper alloy, usually mixed tin as the main additive.
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select the characteristics for helium gas as compared to argon. (select…
Limited resource, More expensive, Lighter than air, Inert
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select the characteristics for argon gas compared to helium. (select al…
Heavier than air, Less expensive, Readily available from the atmosphere, Inert
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a nurse is caring for a client who was prescribed an antidepressant bas…
A. Pharmacologic action
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when reviewing a list of medications in a medication handbook, a nurse …
It begins with a lowercase letter.
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2. calcium has one more electron than potassium in its outer shell. how…
2
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consider the following compounds containing carbon and hydrogen: ch4, c…
\(C_4H_6\) and \(C_8H_{12}\) have the same empirical formula.
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figure 2: a bohr model of a potassium atom. which electron in a potassi…
The outermost electron in a potassium atom is most likely to leave the atom. This is because, as shown in the Bohr model, it is farthest from the positively - charged nucleus, so …
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what is the formula used for calculating percent composition of each el…
\(\text{percent of element}=\frac{\text{mass of element in compound}}{\text{molar mass of compound}}\times100\%\)
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policies current attempt in progress what is molar mass? molar mass is …
1, \(6.02\), \(23\)
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current attempt in progress what is the relationship between avogadros …
one mole
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2. calcium has one more electron than potassium in its outer shell. how…
2
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analysis questions: 1. using attraction, briefly explain why the electr…
Electrons fill the shells closest to the nucleus first because the electrostatic attraction between the negatively - charged electrons and the positively - charged nucleus is stro…
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policies current attempt in progress what is a mole? a mole is an amoun…
entities; 12
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figure 2: a bohr model of a potassium atom. which electron in a potassi…
Electron shells closest to the nucleus fill up first because the electrostatic attraction between the negatively - charged electrons and the positively - charged nucleus is strong…
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current attempt in progress which of the following chlorides has the hi…
\(LiCl\)
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current attempt in progress calculate the percent composition by mass o…
\(16.4\)
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here are sketches of four electron orbitals: a b c d are any of them s …
Are any of them s orbitals? no List the s orbitals, if any. (leave blank) Are any of them p orbitals? yes List the p orbitals, if any. A, C, D
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4 atoms w to moles w mol w etextbook and media 94 molecules h₂o to kg h…
For \(4\) atoms \(W\): \(6.64\times 10^{-24}\text{ mol}\) For \(94\) molecules \(H_2O\): \(2.81\times 10^{-24}\text{ kg}\)
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calculate the mass in grams of each of the following and provide the an…
- The mass of 2 atoms of Xe is \(4.36\times 10^{-22}\space g\). - The mass of 2 molecules of \(CH_{3}COOH\) is \(1.99\times 10^{-22}\space g\).
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13 molecules p₂o₅ atoms etextbook and media 3.94 mol o₂ atoms
For \(13\) molecules \(P_2O_5\): \(91\) atoms. For \(3.94\space mol\space O_2\): \(4.75\times10^{24}\) atoms.
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methane and chlorine react to form chloroform and hydrogen chloride, li…
- When the temperature is lowered: The pressure of \(HCl\) will increase, and the equilibrium shifts to the right. - When the temperature is raised: The pressure of \(Cl_{2}\) wil…
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2.06 mol c₂h₄ molecules etextbook and media 0.968 mol n₂o molecules
For \(2.06\space mol\space C_2H_4\): \(1.24\times 10^{24}\space\text{molecules}\) For \(0.968\space mol\space N_2O\): \(5.83\times 10^{23}\space\text{molecules}\)
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calculate the number of grams in each of the following: 0.739 moles of …
For \(0.739\space moles\) of \(Ti\): \(35.4\space g\) For \(1.01\times 10^{24}\space atoms\) of \(S\): \(53.9\space g\)
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how many moles of atoms are contained in each of the following? 6.65 x …
For \(6.65\times 10^{24}\space K\) atoms: \(11.0\space mol\) For \(26.0\space g\) of \(Au\): \(0.132\space mol\)
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it takes 412. kj/mol to break a carbon - hydrogen single bond. calculat…
\(291\space nm\)
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current attempt in progress determine the molar mass of na₂so₄? report …
\(142.05\ g/mol\)
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it takes 151. kj/mol to break an iodine - iodine single bond. calculate…
\(792\space nm\)
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current attempt in progress of the following compounds whose molecular …
butanol, \(C_4H_{10}O\); pentane, \(C_5H_{12}\); paraffin, \(C_{25}H_{52}\)
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it takes 157. kj/mol to break a nitrogen-oxygen single bond. calculate …
\(763\)
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question 2 of 25 policies current attempt in progress how many grams of…
\(4.77\)
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diphenhydramine hydrochloride, a drug used commonly as an antihistamine…
carbon: \(69.99\%\) hydrogen: \(7.60\%\) nitrogen: \(4.80\%\) oxygen: \(5.49\%\) chlorine: \(12.15\%\)
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a chemical reaction takes place inside a flask submerged in a water bat…
\(22.7^{\circ}C\)
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what does the right to know law require from manufacturers, importers, …
Labels and Safety Data Sheets
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what does the right to know law require from manufacturers, importers, …
Labels and Safety Data Sheets
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who is required to provide information through the right to know law? e…
Employers, Chemical Manufacturers, Chemical Distributors, Chemical Importers.
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rank these liquids by their expected surface tension. rank from greates…
\(HO - CH_2CHCH_2 - OH>CH_3CH_2CH_2 - OH = CH_3CHCH_2 - OH>CH_3CH_2OCH_3\)
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calculate the energy required to heat 484.0 mg of graphite from 10.7 °c…
\(3.33\space J\)
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worldwide, scientists are working on different options for clean energy…
$$\Delta H = 90.1\,\text{kJ}$$ Since $\Delta H>0$, the reaction is endothermic.
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in an experiment, naoh and hcl are mixed. based on the graph, what is t…
13.2°C
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if an experiment has a $q_{rxn}$ of 518.07 j, calculate the change in e…
12.95 kJ/mol
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what is the δh of a reaction where the mass of the solution is 18.7 g a…
-674.27 J
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what is the $delta h$ of a reaction where the mass of the solution is $…
- 674.27 J (First option)
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calculate the percent error of a chemical reaction with a theoretical v…
19.92%
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(lp - 5061 - ck - 01) / hesss law evaluation remaining time: unlimited …
True
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when an ____ reaction occurs the products have a greater enthalpy than …
A. endothermic; exothermic