化學
化學反應、化學計量、分子結構與元素性質。
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question 6 of 6 which of the following (is) are true? the greater the c…
The second option: The greater the difference in electronegativity of the atoms in a polar covalent molecule the greater the dipole force.
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question 6 of 6 which of the following (is) are true? □ the greater the…
- The first statement: “The greater the charge of the ions the greater the ion - dipole force and the greater the dipole” is True. - The second statement: “The greater the differe…
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describing conduction complete the passage to describe conduction. cond…
First blank: thermal (heat) Second blank: particles (atoms/molecules) Third blank: direct
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question 5 of 6 which of the the following is (are) true about lon - di…
the positive end of the polar molecules are attracted to the negative ions. the negative end of the polar molecules are attracted to the positive ions.
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question 4 of 6 click on the following true statements about water. - w…
Water is a polar covalent molecule. A water molecule is attracted to another water molecule by hydrogen bonds.
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question 3 of 6 what is true about a molecule with a dipole? ○ it is a …
It is a polar molecule.
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question 2 of 6 click on the following statements that are true. ☐ sodi…
- Sodium loses an electron to become a Sodium ion - Sodium gets smaller because it loses an energy level - The Sodium ion has the same electron configuration as Neon
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complete the table to convert from one met1. centiliters × or ÷ millili…
La tabla completada es: | centiliters | × or ÷ | milliliters | |-------------|--------|-------------| | 1 | × 10 | 10 | | 2 | × 10 | 20 | | 3 | × 10 | 30 |
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find the relative clause. if it is nonrestrictive, set it off with comm…
that have not been treated with pesticides
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find the relative clause. if it is nonrestrictive, set it off with comm…
that have not been treated with pesticides
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2.000 g of compound x with molecular formula c₄h₆ are burned in a const…
\( \boldsymbol{15.0\space kJ/mol} \) (rounded to correct significant figures, or precise value from calculation)
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10) \the total mass of the substances before a chemical change will be …
C) scientific law
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which statement best describes the rhyme scheme of \a thought on the in…
There are two stanzas with the rhyme scheme ABCB throughout.
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which statement best describes the rhyme schemes of \the author to her …
D. Bradstreet uses couplets for their overall rhyme scheme and structure; Wheatley uses couplets to enhance the poem as a song of praise for creation.
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read the lines from act i, scene v of romeo and juliet romeo. to juliet…
C. Romeo’s lines make up one quatrain, which uses an abab rhyme scheme
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a poem with fourteen lines and a mixed rhyme scheme is a foil couplet s…
D. sonnet
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read the lines from act i, scene v of romeo and juliet. romeo to juliet…
Romeo’s lines make up one quatrain, which uses an abab rhyme scheme
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a. they are all in the same group b. they all have the same number of v…
A. Oxygen and Sulfur
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ssess it! section. output station do at least two input stations before…
D. Calcium
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output: assess it! 1 of 4 1. which is not true about all of these eleme…
C. They all have the same number of protons ### Question 3 (Assuming typical periodic table knowledge, elements in the same group have similar properties. For example, O and S (bo…
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(b) state two pieces of evidence which show that a chemical reaction is…
1. Magnesium burns with a bright white flame (light is produced). 2. A white solid (magnesium oxide) is formed (new substance). ### Part (c)
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read the text. during world war i, british and american warships were a…
problem - solution
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a compound contains 76.6% c, 6.38% h and 17.0% o. which of the followin…
c. $C_6H_6O$
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7. for each structure, identify which compound class it belongs to. b) …
- A: alcohol (select the circle under "alcohol" for A) - B: aldehyde (select the circle under "aldehyde" for B) - C: ketone (select the circle under "ketone" for C) - D: amine (se…
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if a molecular formula is $c_8h_{12}o_2$, what is the empirical formula…
d. \( C_4H_6O \)
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determine the empirical formula from the molecular formula, c₆h₁₂o₆. a …
a. \( CH_2O \)
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the image shows a molecular structure with carbon 1, carbon 2, oxygen, …
- Carbon 1: Tetrahedral - Carbon 2: Trigonal Planar - Oxygen: Bent - Carbon 3: Tetrahedral
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a compound contains 52.2% c, 13.0% h and 34.8% o. which of the followin…
e. \( \text{C}_2\text{H}_6\text{O} \)
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i carbon 1 carbon 2 carbon 3 oxygen linear bent tetrahedral trigonal pl…
- Carbon 1: Tetrahedral (select the circle under "Tetrahedral" for Carbon 1) - Carbon 2: Tetrahedral (select the circle under "Tetrahedral" for Carbon 2) - Carbon 3: Tetrahedral (…
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an unknown compound consists of 9 moles of hydrogen, 3 moles of carbon,…
c. $CH_{3}Br$
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true or false: a compound has 4 moles of hydrogen, 2 moles of carbon, a…
b. False
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carbon 1 linear bent tetrahedral trigonal planar trigonal pyramidal car…
- Carbon 1: Tetrahedral (select the radio button under Tetrahedral for Carbon 1) - Carbon 2: Trigonal Planar (select the radio button under Trigonal Planar for Carbon 2) - Carbon …
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true or false: a compound contains 38.7% c, 9.70% h, and 51.6% o. thus …
b. False
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a compound contains 28% h and 72% c by mass. which of the following is …
a. $C_3H_{14}$
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____ formula is used to show the lowest whole-number ratio of elements …
b. Empirical
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complete the text with the better conjunctive adverb. when hunting prey…
Also
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complete the text with the better conjunctive adverb. scientists believ…
Consequently
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2. intermediate information about substances w, x, y and z is shown in …
(b) 1. Substance Z melts to form a yellow liquid (physical change, state change from solid to liquid). 2. Substance Y dissolves in water to form a blue solution (physical change, …
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practice basics 1. baking powder is used to raise dough. in baking, it …
\(H_2O\) (Water) ### (a) Solution:
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which form of energy can radiant energy be transformed into? chemical e…
Thermal energy
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practice 1 basic baking powder is used for inner doughs in baking. it c…
### (p) - Step-by-Step Explanation (Chemistry, a subfield of Natural Science) #### Step 1: Identify Reactants and Products in Step 1 In Step 1, the reaction is: Sodium hydrogen ca…
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practice basic 1. baking powder is used to raise dough in baking. it co…
| Element | Number of atoms | |---------|-----------------| | Carbon (C) | 4 | | Hydrogen (H) | 6 | | Oxygen (O) | 6 | ### Part (b)
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in chemistry, the ph of a solution is defined to be $\\text{ph} = - \\l…
\( 4.8 \)
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if the artist often uses similar methods in her art, identify each type…
1. Jewelry: Likely metal - based (e.g., gold - alloyed) jewelry (due to Au, Mg, C, O). 2. Clothing: Likely dyed textile clothing (due to Cd, S, C, H, N for dyes and textiles).
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art piece\tmaterial\tpurpose \tag\tmetal clothing\tn\tforms acrylic fib…
Ag (Silver) is a metal (classification based on periodic table and given table).
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question 2 at standard temperature and pressure, carbon dioxide has a d…
B. 0.86 m³
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test information description instructions from the list of choices, sel…
2.94 kg
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missed this? watch kcv: amiotunt of chunge, read section 11.9. you can …
323
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a sample of gas has a mass of 0.565 g. its volume is 112 ml at a temper…
\boxed{148} (Wait, but maybe the correct answer is 148? Or maybe I made a mistake. Wait, let's check with exact values: Wait, 0.565 g, V=0.112 L, T=358.15 K, P=763/760 atm. \( n =…
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how many moles of gas must be forced into a 5.2 l tire to give it a gau…
\( 0.66 \)
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a sample of methane gas has a volume of 3.52 l when its gauge pressure …
32500 (or 3.25×10⁴) mL (depending on significant figures, but likely 32500 mL with three sig figs)
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warm-up activity identify the influence analyze influences choose one s…
Scenario: A farmer chooses not to use pesticides on crops. Influence on environment: Reduces chemical pollution in soil, water, and on crops. Impact on others' health: Decreases e…
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chapter 11 homework exercise 11.24 - enhanced - with feedback 88.4 psi …
s: For 88.4 psi: \( \boldsymbol{6.02\ \text{atm}} \) For 34.30 in. Hg: \( \boldsymbol{1.146\ \text{atm}} \)
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missed this? read section 11.3. you can click on the review link to acc…
(Part A): \( \boxed{1.21} \) (Wait, maybe I made a mistake in Part A. Wait, let's check again. 923 torr to atm: 1 atm = 760 torr. So 923 / 760 = 1.21447, so to three significant f…
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these are networks of capillaries found in the walls of the ventricles …
A. choroid plexuses ### Question 8 (Second Multiple Choice)
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professor mcgee measured the composition of gases in a sample. the samp…
567.935
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a chemist has several beakers full of different liquids that she will u…
\( 372.093 \)
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professor walter took a sample of metal and measured how many kilograms…
$82.85$
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a chemist has several beakers full of different liquids that he will us…
483.487
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what is positron emission? positron emission occurs when the nucleus em…
B. Positron emission occurs during the conversion of a proton in the nucleus to a neutron. ### Part B
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the table shows some common compounds found in sunscreen. compound | fo…
A mineral sunscreen containing titanium dioxide protects the skin by reflecting UVB waves.
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what is gamma radiation? ○ gamma radiation is a type of electromagnetic…
A. Gamma radiation is a type of electromagnetic radiation that is essentially a high energy photon. ### Part B
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the table shows some common compounds found in sunscreen. compound foun…
reflecting UVB
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the table shows some common compounds found in sunscreen. compound | fo…
reflecting UVB
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what is beta radiation? ○ beta radiation occurs when the nucleus emits …
A. Beta radiation occurs when the nucleus emits an electron. ### Part B
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what is alpha radiation? ○ alpha radiation occurs during the conversion…
C. Alpha radiation occurs when the nucleus emits a particle that contains 2 protons and 2 neutrons. ### Part B
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explain what is represented by each symbol in the notation \\( _z^a x \…
1. \(A\) - mass number 2. \(X\) - chemical symbol 3. \(Z\) - atomic number
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what role did marie sklodowska curie play in the discovery of radioacti…
B. She has discovered two new elements that were both radioactive. ### Part B
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1. what is radioactivity? 2. what does it mean for an atom to be radioa…
1. Radioactivity is the $\boldsymbol{\text{emission}}$ of $\boldsymbol{\text{tiny}}$, $\boldsymbol{\text{invisible}}$ (to the human eye) particles by the $\boldsymbol{\text{nuclei…
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chemistry name: date: the clues of the periodic table activity in this …
The subfield is Chemistry (under Natural Science).
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question 4 (1 point) retake question calculate the molarity of 12.4 g k…
s: Question 4: $\boxed{0.575}$ M KCl Question 5: $\boxed{0.241}$ M CaCl₂
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single replacement, double replacement, synthesis, zn + h₂s → h₂ + zns …
The reaction \( \text{CH}_4 + 2\text{O}_2 ightarrow \text{CO}_2 + 2\text{H}_2\text{O} \) belongs in the "Combustion" cell (the bottom - middle cell in the grid).
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how are chemical equations written? scientists express chemical reactio…
- The bond with dashed lines (between molecules): hydrogen bond - The bond with solid lines (within a molecule): covalent bond - The small H - labeled circles: hydrogen atom - The…
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1 0 h 1 hydrogen check atom symbol game
The atomic structure diagram (left) and the periodic table - like information (right) correctly represent Hydrogen, with 1 proton, 0 neutrons, 1 electron, atomic number 1, atomic …
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protons: 9 neutrons: 10 electrons: 9 fluorine (with element symbol f, a…
19
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which statement best describes the rhythm of \song of myself\? ○ the po…
C. The rhythm is very similar to the rhythm of everyday speech.
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which of the following models is modeling a plasma state of matter?
The Third Graph (the one with purple and blue dots mixed, third from top)
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check all that apply: which of the following are physical properties? s…
soft texture, weighs 5 kg, red
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identify which images are heterogeneous mixtures! (check all that apply)
The third image (Cake) and the fourth image (Salad) are heterogeneous mixtures.
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“you can’t spend the money!” replied delano. “you have to try to find t…
B. Friends should not let foolish disagreements damage their friendship.
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“wooster just found a wallet in the parking lot,” kim exclaimed. “the w…
C. Delano
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curious carl and his lab partner were burning various fuels: sucrose, p…
C. water and carbon dioxide.
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“what are you guys doing?” asked delano as he walked into the computer …
A. ... he was surprised to find that he had the courage to follow his convictions.
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an element with mass 210 grams decays by 8.3% per minute. how much of t…
61.0
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you want to determine the concentration when 93 ml of a 2.03 m kf solut…
\( 0.047 \)
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you want to determine the volume of 2.5 m lithium nitrate solution need…
150 mL
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an element with mass 310 grams decays by 8.9% per minute. how much of t…
$54.2$
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a poem with fourteen lines and a mixed rhyme scheme is a foil couplet s…
D. sonnet (assuming the options are labeled A to D with A. foil, B. couplet, C. stanza, D. sonnet)
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read the excerpt from a modest proposal. a very worthy person, a true l…
B. anyone who is truly virtuous or patriotic would not suggest using children for food, so Swift means the opposite of what he says
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1. answer the below questions for the sef₄ molecule: a. report the tota…
34 #### 1b. Lewis Structure
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edpuzzle lithium sodium cesium francium hydrogen
A. Lithium, B. Sodium, C. Cesium, D. Francium
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edpuzzle what is the only member of \group 1\, which is not an alkali m…
None of the given options (Potassium, Rubidium, Lithium, Sodium, Cesium) is the only member of Group 1 that is not an Alkali Metal, as all are Alkali Metals. The only Group 1 elem…
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what is the only member of \group 1\, which is not an alkali metal? pot…
None of the given options (Potassium, Rubidium, Lithium, Sodium, Cesium) are non - alkali metals in Group 1 as all of them are alkali metals. However, if we assume a mistake in th…
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multiple choice question aspirin and ibuprofen reduce the synthesis of …
C. antipyretics
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the heat of vaporization $\\delta h_v$ of diethyl ether $\\left(\\left(…
\(-162\space\text{J/K}\) (or \(-161\space\text{J/K}\) depending on rounding precision; more accurately, \(-162\space\text{J/K}\) when using precise calculations)
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the heat of fusion $\\delta h_f$ of toluene $(\\ce{c6h5ch3})$ is 6.6 kj…
$1.0\ \text{J/K}$ (or $1.0\ \text{J·K}^{-1}$)
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using the thermodynamic information in the aleks data tab, calculate th…
-2701
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using the thermodynamic information in the aleks data tab, calculate th…
-1246 (assuming the ALEKS data gives the values as used, but the actual answer depends on the exact values from ALEKS Data tab. The above is a demonstration of the calculation pro…
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using the thermodynamic information in the aleks data tab, calculate th…
-16
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using the thermodynamic information in the aleks data tab, calculate th…
$-280$