化學
化學反應、化學計量、分子結構與元素性質。
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what is the atomic mass of gold?
\(196.9665\)
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how do you calculate mass number? protons + neutrons neutrons + protons…
Protons + Neutrons
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how many electrons does copper have if it has the following charge: cu²…
$27$
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how many protons, neutrons, and electrons? proton = 6, neutron = 2, ele…
proton = 8, neutron = 8, electron = 10 (the blue - colored option)
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proton = 6, neutron = 2, electron = 6 proton = 8, neutron = 8, electron…
Protons: $8$, Neutrons: $8$, Electrons: $10$ (corresponding to the blue box: proton = 8, neutron = 8, electron = 10)
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chemical receptors located in the carotid arteries are called the carot…
Carotid bodies
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decide whether these proposed lewis structures are reasonable. proposed…
- For \( [\colon\ddot{N}-\ddot{N}=\ddot{N}\colon]^{-} \): No, it has the right number of valence electrons but doesn't satisfy the octet rule. The symbols of the problem atoms are…
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chemical receptors located in the carotid arteries are called the carot…
carotid bodies
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fill in the blank question in a material that contains a mixture of gas…
partial
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the aortic and carotid bodies are chemoreceptors that are most strongly…
blood $O_2$ level
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question 1 a base that does not contain the hydroxide ion is — a nh₃ b …
A. \(NH_{3}\)
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question 6 a — solution can be colored, but it needs to be free of susp…
B. colorless, clear; C. colloid, colorless
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question #5 use valence bond theory to explain the bonding in h₂cch₂. t…
- The $\sigma$ bond between the carbon atoms is due to overlap of $sp$ orbitals. - The $\pi$ bonds between the carbon atoms are due to overlap of $p$ orbitals.
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question #5 use valence bond theory to explain the bonding in h₂cch₂. t…
\(0\)
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question #4 methyl cyanoacrylate is the main component of many glues. i…
Atom 1 is \( sp \) hybridized and Atom 2 is \( sp^3 \) hybridized. Bond 1 consists of \( 1 \) sigma bond and \( 1 \) pi bond. This molecule has a total of \( 15 \) sigma bonds and…
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both of these photographs are by ansel adams; however, one received hig…
The black and white one. Because black and white required more craft and darkroom technical knowledge/skill.
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question 36 (2 points) how many electrons are in the highest occupied e…
Question 36: \(7\) Question 37: \(2\) Question 38: \(1\) Question 39: \(5\)
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question 32 (1 point) which of the following elements has the smallest …
a. potassium ### Question 33
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question 28 (1 point) which of the following is true about the electron…
- Question 28: d. The highest occupied \(s\) and \(p\) sublevels are partially filled. - Question 29: d. Te - Question 30: d. lose electrons when they form ions.
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question 21 (1 point) each period in the periodic table corresponds to …
- Question 21: a. principal energy level - Question 22: a. number - Question 23: d. nonmetals
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elements of life are s, p, o, n, c, and h. what type of bond do you thi…
A. Covalent
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using what you learned about chemical structures on the last screen, wh…
\(CHONS\)
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question 14 (1 point) according to the aufbau principle, o a electrons …
d. electrons enter orbitals of lowest energy first. # Question 15
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question 9 (1 point) what is the maximum number of electrons in the sec…
C. 8 # Question 10
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question 8 (1 point) how does the energy of an electron change when the…
- Question 8: B. It decreases - Question 6: A. dumbbell - Question 7: A. 5
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match each item with the correct statement below. column a 1 g horizont…
b. energy
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question 3 (9 points) match each item with the correct statement below.…
3. c, 4. h, 5. e, 6. f, 7. i, 8. b, 9. d
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question 1 (5 points) match each item with the correct statement below.…
**Question 1** 1. b. atomic orbital 2. e. ground state 3. c. aufbau principle 4. d. electron configuration 5. a. Pauli exclusion principle **Question 2** 1. f. photon 2. e. quantu…
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les illustrations ci - dessous montrent la représentation de quelques s…
a) Nickel (Ni), Éthanol (\(C_2H_5OH\)), Dichlore (\(Cl_2\)) b) Nickel (Ni), Dichlore (\(Cl_2\)) c) Dichlore (\(Cl_2\)) d) Éthanol (\(C_2H_5OH\)) e) Air
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7 détermine mentalement quelle solution possède la plus grande concentr…
La solution c) a la plus grande concentration.
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what is the arrhenius definition of a base? a substance that increases …
A. A substance that increases OH⁻ concentration when it is dissolved in water.
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a solution contains 90 ml of methanol, 18 ml of propanol, and 2 ml of d…
methanol
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mixtures, solutions, and acid - base interactions why is citric acid ad…
To add tartness
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3 quel énoncé ne décrit pas un aspect du modèle particulier de la matiè…
d) Les particules de matière grossissent avec l'augmentation de la température.
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mixtures, solutions, and acid - base interactions a can of soda contain…
water
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mixtures, solutions, and acid - base interactions a substance is dissol…
Bronsted - Lowry acid
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what do strong acids and strong bases have in common? they both dissoci…
They both dissociate completely, with little or no reverse reactions.
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determine which of the following elements electron configurations are n…
- For \(I\): The given configuration \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}4d^{10}4p^{5}\) is incorrect. The correct configuration is \([Kr]4d^{10}5s^{2}5p^{5}\) (or expanded \(1s…
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ic 25 - 26 physical science 1 mixtures, solutions, and acid - base inte…
A base turns red litmus blue.
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several substances are labeled on the ph scale. which substance has the…
milk
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questions a choix multiple 1 quelle est lunité de base dun composé? a) …
c) Une molécule constituée de plusieurs sortes d'atomes
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which of these accurately describes why an acid is strong? an acid is s…
An acid is strong when it dissociates completely in water.
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a base is added to water. what happens when the position of equilibrium…
The base is partially dissociating into products.
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what does it mean for a weak acid to be in equilibrium? at equilibrium …
The acids only slightly dissociate and readily undergo reverse reaction.
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if hydrofluoric acid is a stronger acid than acetic acid, which stateme…
The conjugate base of hydrofluoric acid is weaker than that of acetic acid.
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which of these refers to the concentration of an acid? a compound that …
a measure of quantity of acid dissolved in water that is designated by molarity
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what does it mean for a strong acid to be in equilibrium? the equilibri…
The equilibrium lies far to the right so that products are very heavily favored.
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which is true of weak acids and bases? they are unable to react with wa…
They partially dissociate in water.
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an acid has a molarity of 0.01 m. what does the 0.01 m refer to? the am…
the concentration of the acid
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which statement about the self - ionization of water is correct? two wa…
Two water molecules interact to form a hydronium ion and a hydroxide ion.
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what is the equilibrium constant of pure water at 25°c? 10^7 10^-7 10^1…
\(10^{-14}\)
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a substance with a high poh would likely have which of these? a high oh…
A high \([H^{+}]\) and a low \(pH\)
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based on the definition of logarithms, what is the difference in hydrog…
D. A substance with a pH of 2 has a 10 times higher concentration of \(H^{+}\) than a substance with a pH of 3.
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what is the ph of a solution with h⁺ = 1.25 × 10⁻¹⁰ m? use ph = - log h…
B. \(9.90\)
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which of these correctly defines the ph of a solution? the log of the h…
the negative log of the hydronium ion concentration
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the ph of a solution decreases by 2.0. how does the hydronium ion conce…
increases to 100 times the original concentration
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which describes an alkaline solution? acidic ph equal to 7 ph less than…
basic
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a solution containing hcl would likely have a high ph and a low poh. a …
a low pH and a high pOH.
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the poh of a solution is 10.75. what is the concentration of oh^- ions …
B. \( 1.778\times 10^{-11}\text{ M} \)
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5) ______ pbbr₂ + ______ hcl → ______ hbr + ______ pbcl₂
\(1\) \(PbBr_{2}+2\) \(HCl ightarrow 2\) \(HBr + 1\) \(PbCl_{2}\)
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which reaction displays an example of an arrhenius base? hcl(g)+h2o(l)→…
\(NaOH(s)\to Na^+(aq)+OH^-(aq)\)
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4) ____licl + ____br₂ → ____libr + ____cl₂
\(2\) \(LiCl+1\) \(Br_2\to2\) \(LiBr + 1\) \(Cl_2\)
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what is the arrhenius definition of an acid? a compound that donates pr…
A substance that increases \(H_3O^+\) concentration when it is dissolved in water.
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3) p4 + br2 → pbr3
\(1\) \(P_4+6\) \(Br_2 ightarrow4\) \(PBr_3\)
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ic 25 - 26 physical science 1 arrhenius, bronsted - lowry, and lewis ac…
HI and \(I^{-}\)
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what is the bronsted - lowry definition of a base? a substance that inc…
a compound that accepts protons
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ic 25 - 26 physical science 1 arrhenius, bronsted - lowry, and lewis ac…
Arrhenius definition of a base
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ic 25 - 26 physical science 1 arrhenius, bronsted - lowry, and lewis ac…
a substance that accepts electrons to form a covalent bond
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2) feo + pdf₂ → fef₂ + pdo
\(1\ FeO+1\ PdF_2 ightarrow1\ FeF_2 + 1\ PdO\)
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ic 25 - 26 physical science 1 arrhenius, bronsted - lowry, and lewis ac…
\(NH_3\) and \(NH_4^+\)
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ic 25 - 26 physical science 1 arrhenius, bronsted - lowry, and lewis ac…
HCN
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ic 25 - 26 physical science 1 arrhenius, bronsted - lowry, and lewis ac…
HF and \(F^{-}\)
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what is the bronsted-lowry definition of an acid? a compound that donat…
a compound that donates protons
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which is a property of acids in aqueous solutions? they increase the co…
They increase the concentration of \(H^{+}\) ions.
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which of these substances contributes to soaps slippery texture? carbon…
a base
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which best defines an acid? an acid has a ph of 7. an acid has fewer po…
An acid has more hydrogen ions in solution.
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which statement would indicate the presence of an acid? it does not rea…
It reacts with active metals to form a gas.
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h_{3}co_{3} is used in soft drinks. what is the name of this compound? …
carbonic acid
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properties of acids and bases which is a characteristic of a strong bas…
It removes \(H^{+}\) ions from solution.
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properties of acids and bases what is a base used in deodorants? sorbit…
magnesium hydroxide
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the main active components of bleach and many other household cleaners …
bases.
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when does phenolphthalein turn pink? when it is reacting with a metal i…
C. in the presence of a base
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fill in the blank question is the study of the physics, chemistry, and …
Meteorology
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why does air temperature increase with altitude in the stratosphere? oz…
Ozone molecules absorb ultraviolet radiation from the Sun.
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fill in the blank question at the bottom of the ozone layer, the temper…
ozone; ultraviolet; Sun
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18. at stp, a 7.49 - gram sample of an element has a volume of 1.65 cub…
4) Ti ### Question 19
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15. which of these halogens is the least reactive on the period table? …
15. 1) I 16. 2) rhenium 17. 2) selenium
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13. samples of four group 15 elements, antimony, arsenic, bismuth, and …
13. 2) Bi 14. 4) Rb
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11. which atom has the weakest attraction for electrons in a chemical b…
11. 2) a calcium atom 12. 4) Cs
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use of chemicals called chlorofluorocarbons, or cfcs, has caused levels…
decrease
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what word should food handlers be looking for on the label of any chemi…
Sanitize
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when chemicals are transferred from their original containers, what mus…
Label its contents
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which is the best place to store a toxic chemical, like insecticide, in…
In a locked maintenance closet
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use of chemicals called chlorofluorocarbons, or cfcs, has caused levels…
decrease
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question 25 (2.5 points) ronnie is a general partner in organic oasis, …
Question 25: B. personally liable to the full extent Question 26: A. dissolution
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which can be a cause of food - borne illness? pathogens physical object…
All of the above
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1)_____albr₃ +_____k→_____kbr +_____al
\(1AlBr_3+3K ightarrow3KBr + 1Al\)
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7) the law of conservation of mass states that the mass of the must be …
reactants; products
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write the final coefficients below. ____ ch₄ + ____ o₂ → ____ co₂ + ___…
1 \(CH_4\) + 2 \(O_2\) → 1 \(CO_2\) + 2 \(H_2O\)
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balancing equations - phet simulator period instructions: open the bala…
\(\boldsymbol{1}\) \(N_2+\boldsymbol{3}\) \(H_2 ightarrow\boldsymbol{2}\) \(NH_3\)