化学
化学反応、化学量論、分子構造、元素の性質。
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question 9 (1 point) listen to determine if the metal salt contains par…
B. place the magnets on the metal salt vial.
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question 8 (1 point) how many unpaired electrons does co³⁺ have? a) 6 b…
C. 4
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hydrogen selenide (h₂se) reacts with water according to the following e…
The acid is $\mathrm{H_2Se}$, the base is $\mathrm{H_2O}$, the conjugate base is $\mathrm{SeH^-}$, and the conjugate acid is $\mathrm{H_3O^+}$.
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question 7 (1 point) listen what charge does a zinc ion most often have…
A. +2
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question 6 (1 point) what orbital contains the highest energy electron …
B. 5s
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liquid water can be separated into hydrogen gas and oxygen gas through …
No, the pressures are not equal because the number of moles of the two gases are different while volume, temperature and the gas - constant are the same.
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question 5 (1 point) listen which of the following is the correct elect…
a) [Kr]4d^{8}
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question 4 (1 point) how many valence electrons does a neutral as atom …
5
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question 3 (1 point) which is true for a paramagnetic salt? a) has orbi…
C. Has orbitals that contain unpaired electrons
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question 2 (1 point) what is the correct electron configuration for sil…
C. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{2}$
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what is the correct abbreviated electron configuration for germanium (g…
e) [Ar]4s²3d¹⁰4p²
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in 3-5 sentences, summarize how the change of state from ice to water i…
When ice is heated, kinetic energy of its molecules increases. This increase allows kinetic energy to overcome intermolecular forces of attraction in ice. As a result, ice melts i…
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what is the ph of a 1 × 10⁻⁴ mol hcl solution? (1 point) o 6 o 8 o 2 o 4
D. 4
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based on patterns in the periodic table, which list shows the acids in …
HCl, H₂S, PH₃ (corresponding to option: HCl, H₂S, PH₃)
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which statement best describes what it means when something is classifi…
It easily dissociates into ions in solution
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how is a mole related to concentration? (1 point) the volume of particl…
The number of particles of solute in a solution is measured in moles.
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which of these substances would be more soluble in cold water than warm…
Oxygen gas
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crystals are made using supersaturated solutions of solids in water. th…
The water would need to be heated to a higher temperature, which would give molecules and ions more kinetic energy, increasing solubility.
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which statement best describes what happens when oil and water are stir…
Water molecules attract each other, but they will not attract oil molecules, causing separation
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when salt dissolves completely in water, which term best describes the …
C. solvent
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material in the tube, ph value (0 to 14 paper), ph value (4.5 to 7.5 pa…
A. The pH values from 4.5 - 7.5 are more precise for substances with pH values originally within the 4.5 - 7.5 range when measured with the 0 - 14 paper. B. It provides more accur…
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1. test: before you begin testing with the 4.5 - 7.5 paper, list the ph…
A. The 4.5 - 7.5 pH paper gives more precise readings for substances with pH values originally within the 4.5 - 7.5 range when measured with the 0 - 14 paper. B. It provides more …
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1. test: before you begin testing with the 4.5 - 7.5 paper, list the ph…
The pH values from the 4.5 - 7.5 paper are more precise for substances with pH values originally within the 4.5 - 7.5 range when measured with the 0 - 14 paper. For substances wit…
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5. suppose you have already compared the ph values of two substances us…
when both substances had a pH value of about 6 on the 0 - 14 paper
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4. based on the materials measured in the gizmo, what is the most likel…
B. 3.9
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2. a new mild dish detergent is being tested before putting it on the m…
(Without seeing the specific colors of A, B, C, D clearly in the image, assume based on general knowledge that a mild basic solution would likely match the color of the option cor…
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1. place these unknown ph test papers in order from most acidic to most…
Paper D, paper B, paper C, paper A
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which element does this bohr model represent? * nitrogen magnesium fluo…
C. Fluorine
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how many electrons will aluminum need to gain or lose to be left with a…
C. lose 3
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how many electrons will chlorine need to gain or lose to be left with a…
A. gain 1
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how many valence electrons does nitrogen have? * n 1 2 3 4 5 6 7 8
E. 5
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how many electrons will selenium need to gain or lose to be left with a…
gain 2
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how many valence electrons does neon have? * :ne: 1 2 3 4 5 6 7 8
8
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the octet rule states that most atoms will attempt to fill their outer …
8 electrons
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how many valence electrons does carbon have? 1 2 3 4 5 6 7 8 the octet …
D. 4
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the most dots that can be represented in a lewis diagram is: * valence …
8
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how many electrons will magnesium need to gain or lose in order to have…
1. B. lose 2 2. A. lose
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how many electrons will lithium need to gain or lose to be left with a …
lose 1
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name of the element period number of the element symbol of the element …
B. Sodium
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how many electrons will nitrogen need to gain or lose to be left with a…
C. gain 3
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how many electrons will phosphorus need to gain or lose to be left with…
gain 3
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how many valence electrons does sulfur have? *
6
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which element does this bohr model represent? * o beryllium o carbon o …
A. Beryllium
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valence electrons and lewis dot structures • valence electrons are repr…
only the valence electrons
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an element in group 3 will have? valence electrons. 1 2 3 4 5 6 7 8
3
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which element does this bohr model represent? * p - 10 n - 10 fluorine …
1. Neon 2. gain
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which of the following is a false statement? * lewis dot structures are…
First question: Rows/periods on the Periodic Table are used to identify the number of valence electrons in atoms. Second question: 7
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atoms will try to gain or lose the ? number of electrons possible in or…
1. B. least 2. D. 4
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diagrams that are used to represent valence electrons: dot to dot struc…
1. C. Lewis dot structures 2. B. Silicon
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the _ will identify how many valence electrons for an atom. * period nu…
1. B. group number 2. A. lose 1
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the outermost electrons in an atom are * o valence electrons. o make th…
1. valence electrons 2. A full outer shell of electrons
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how many electrons will oxygen need to gain or lose to be left with a f…
B. gain 2
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determine the number of protons, neutrons and electrons in potassium 19…
$p^{+}:19$, $n^{0}:20$, $e^{-}:19$
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which of the following is a true statement? * 2 points rows/periods on …
Groups/columns on the Periodic Table are used to identify the number of valence electrons in main group elements.
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what are valence electrons? valence electrons are the outermost electro…
6
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6. determine the number of protons, neutrons and electrons in the follo…
For potassium ($K$): $p^+=19$, $n^0 = 20$, $e^-=19$ For tellurium ($Te$): $p^+=52$, $n^0 = 76$, $e^-=52$
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rule that explains the need for atoms to have 8 electrons in its outer …
E. Octet Rule
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6. determine the number of protons, neutrons and electrons in the follo…
Potassium ($K$): Protons: 19, Neutrons: 20, Electrons: 19 Tellurium ($Te$): Protons: 52, Neutrons: 76, Electrons: 52
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how many electrons will bromine need to gain or lose in order to have a…
gain 1
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how many electrons will nitrogen need to gain or lose in order to have …
C. gain 3
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multiple - choice question ionic compounds are not soluble, and the sol…
are soluble, and the solution conducts electricity
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multiple - choice question what kind of bond is formed by the transfer …
B. ionic bond
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multiple - choice question based on coulombs law, which would you expec…
MgS
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multiple - choice question a bond between a positive ion and a negative…
B. an ionic bond
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multiple - choice question what type of ion do metals form? anions cati…
B. cations
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multiple - choice question when are most atoms stable? when they have 1…
None of the provided options are correct. Most atoms are stable when they have 8 valence electrons (except hydrogen and helium which follow different rules for stability).
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multiple - choice question what is a polar covalent bond? electrons mor…
Electrons more attracted to one atom causing a negative charge and positive charge within a molecule.
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multiple - choice question what are electrons that are not bonded calle…
B. Lone pairs
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multiple - choice question in a lewis dot structure, what is represente…
B. Valence Electrons
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multiple - choice question what is electronegativity? how much energy i…
The ability of an atom to attract a shared pair of electrons
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multiple - choice question what is electronegativity? how much energy i…
- For "What is electronegativity?": The ability of an atom to attract a shared pair of electrons. - For "In a Lewis dot structure, what is represented by dots?": Valence Electrons
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multiple - choice question what type of bond results from sharing elect…
covalent bond
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bent = electron geometry molecular geometry tetrahedral= molecular geom…
1. molecular geometry 2. electron geometry 3. molecular geometry 4. electron geometry
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multiple - choice question what happens when atoms get too close to eac…
Their nuclei repel each other
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match the correct bonding symbol to the description of the position of …
H is in the front of the paper; bond points toward the viewer.
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match the correct bonding symbol to the description of the position of …
For N - H with solid - wedge: H is in the front of the paper; bond points toward the viewer For S - H: H is in the plane of the paper; bond is also in the plane of the paper
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multiple - choice question where are the electrons in a covalent bond? …
C. Between the nuclei
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fill in the blanks with the number of valence electrons that each atom …
Si = 4 H = 1 S = 6 Br = 7 Ca = 2 N = 5
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multiple - choice question what connects chemical bonds? all of the abo…
B. Electrons
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question 6 of 10 not yet answered points possible: 0.50 determine wheth…
Tetrahedral CCl₄: Non - polar Linear CS₂: Non - polar Trigonal pyramidal NH₃: Polar
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identify the molecular geometry around the nitrogen atom highlighted re…
Trigonal pyramidal
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multiple - choice question how do atoms achieve their lowest energy? ba…
Balancing attractive and repulsive forces
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question 3 match the scientist to his contributions. won a nobel prize …
Won a Nobel Prize for his discovery of plutonium and synthesis of neptunium: Glenn Seaborg Ordered the Periodic Table by increasing atomic number, died in WWI: Henry Moseley Order…
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unit conversion tutorial use the provided unit - conversion factors. ma…
8340
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a certain reaction is first order in n2 and second order in h2. use thi…
For the first blank: $2.56\times 10^{-3}M/s$ For the second blank: $7.22\times 10^{-5}M/s$
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exercise iv—inference complete the sentences by inferring information a…
1. mix the ingredients together. 2. troubled or harassed. 3. reading relevant books or materials.
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what creates the \space\ indicated in this \space filling\ model of wat…
constantly moving electrons
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consider a hypothetical chemical reaction: a + b → c + d (in this equat…
What is the heat of reaction? -50 kJ/mol Is the reaction exothermic or endothermic? Exothermic Can you determine the activation energy? Yes, it's 200 kJ/mol Can you determine the …
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check your understanding 1. name each of the following ionic compounds:…
1. - (a) Magnesium bromide - (b) Potassium hydrogen sulfate - (c) Ammonium phosphate - (d) Calcium hydroxide 2. - (a) Carbon tetrafluoride - (b) Phosphorus trihydride (phosphine) …
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honors chemistry—unit 2 video guide the race for absolute zero answer t…
1. Refrigerators, freezers, MRI machines. 2. Antarctica; about - 128.6°F (- 89.2°C). 3. Scottish chemist and physicist; Dewar flask. 4. Resisted liquefaction due to low boiling po…
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question 3 5 points which of the following is true about air molecules …
B. The density of air molecules decreases as pressure decreases
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use the drop - down menus to make the following statements correct. all…
The used plastic pipets will be: collected in a specific solid waste container.
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question 1 5 points the ideal gas law tells us that: a warm air is more…
B. Warm air parcels rise and cool air parcels sink because of differences in density.
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a student analyzes a solution for color and obtains the following graph…
500 nm
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the function ( f(x)=\frac{6.5x^{2}-63.8x + 2102}{x^{2}+324}) models the…
5.5 (estimated value from the graph to the nearest tenth)
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the function (f(x)=\frac{8.5x^{2}-84.2x + 3740}{x^{2}+678}) models the …
4.8
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why couldnt mendeleev organize the entire table during his research? th…
C. Some elements were undiscovered at the time
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what are the basic building blocks of matter? compounds molecules elect…
D. atoms
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what happens when aluminum fills its valence shell? three electrons are…
Three electrons are lost, creating Al³⁺
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what is group 18 of the periodic table called? metals noble gases nonme…
B. noble gases