化学
化学反应、化学计量、分子结构与元素性质。
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163.26 g/mol, c₁₁h₁₇n express your answer as a chemical formula. a chem…
\(C_{12}H_{14}N_2\)
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part b naproxen (aleve) c, 73.03% h, 6.13% and o, 20.84% express your a…
\(C_{14}H_{14}O_{3}\)
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acetaminophen (tylenol) c, 63.56%. h, 6.00%, n, 9.27%, and o, 21.17% ex…
\(C_{14}H_{14}O_{3}\)
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tissues can be classified into four main types: connective, muscle, epi…
- "Epithelial, muscle, connective, and nervous tissues work together to help the stomach break down food." is a true statement. - "The arrangement of its tissues helps the stomach…
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what kinds of substances can leaching carry downward through the soil? …
nutrients, pesticides, and potentially harmful chemicals
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which of these describes physical weathering? minerals in rocks being b…
B. rocks being broken down by freezing and thawing
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part a determine the number of moles of cl in 2.2 mol cacl₂. express yo…
\(4.4\space mol\)
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question 2 (mandatory) (3 points) water is referred to as a polar molec…
A polar molecule has an uneven electron - density distribution, creating partial charges. For example, in \(H_2O\), oxygen (\(\delta -\)) attracts electrons more than hydrogen (\(…
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question 1 (mandatory) (2 points) water and hydrogen bonds chemical rea…
Covalent bond.
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exercise 6.39 - enhanced - with feedback missed this? watch kcv: the mo…
\(2.3\times 10^{21}\space C\space atoms\)
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missed this? watch kcv the mole concept, iwe the mole concept - convert…
$33\ g$
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missed this? watch kcv the mole concept, (me the mole concept - convert…
\(0.373\space mol\)
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multiple - choice question what will go on the denominator of the conve…
\(6.35\space g\)
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correct the mole establishes a relationship between moles of atoms and …
\(1.29\times 10^{23}\text{ atoms}\)
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2.0 mol cu express your answer using two significant figures. n = submi…
- Part A: \(1.2\times 10^{24}\text{ atoms}\) - Part B: \(3.3\times 10^{21}\text{ atoms}\) - Part C: \(1.53\times 10^{25}\text{ atoms}\)
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which property do metalloids share with nonmetals? ○ both are brittle. …
Both are brittle.
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the table below lists the properties of a metallic element where on the…
Group 12
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what trend does the reactivity of most nonmetals show in a periodic tab…
decreases from left to right across the periodic table
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which element is most likely to be shiny? ○ sulfur (s) ○ boron (b) ○ ca…
calcium (Ca)
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which properties are characteristic of metalloids? high electrical cond…
intermediate conductivity and a high melting point
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the elements least likely to form bonds are found in which group? 15 16…
18
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1 multiple choice 5 points long - term exposure to opioid drugs has not…
1. can weaken the heart. 2. it more readily crosses the blood - brain barrier. 3. morphine and codeine.
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which determines the reactivity of an alkali metal? its boiling and mel…
its ability to lose electrons
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which lists only metalloids? arsenic (as), sulfur (s), and polonium (po…
Boron (B), germanium (Ge), and tellurium (Te)
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cecil is working with samples of chlorine (cl), oxygen (o), bromine (br…
silver
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which lists the elements in order from most conductive to least conduct…
potassium (K), germanium (Ge), selenium (Se)
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which properties make a metal a good material to use for electrical wir…
conductivity and ductility
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who is known as the \father of modern chemistry\ because he first organ…
Antoine Lavoisier
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part iv) answer the following questions: 1) which statement describes h…
1) a. The atom absorbs energy, and one or more electrons move to a higher electron shell. 3) d. \(2 - 8 - 17 - 8\) 5) c. release energy and return to lower energy levels
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10. the renaissance saw a revival of interest in which of the following…
A. Symmetry and mathematical principles in art
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the image shows how sodium is displayed in the periodic table with thre…
| Label | Characteristic | |--|--| | X | atomic number | | Y | atomic symbol | | Z | atomic mass |
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which set of elements should have similar chemical properties? potassiu…
Lithium (Li), Sodium (Na), and Potassium (K)
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a water molecule has a mass of 2.99 × 10^-26 kg. written in scientific …
\(3\times10^{-20}\text{ kg}\)
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identify the element as a metal or nonmetal or metalloid. metal metallo…
- Strontium, Sr (38): metal - Boron, B (5): metalloid - Potassium, K (19): metal - Xenon, Xe (54): nonmetal - Sulfur, S (16): nonmetal
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the outermost electrons in an atom are called - orbital electrons. clou…
valence electrons.
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an ion is an atom with a charge. ions are charged because there is a di…
C. electrons
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an isotope of an element is the same element (same atomic number) but w…
neutrons.
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the number of protons in an atom of sodium (na) is________. sodium 11 n…
11
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the renaissance saw a revival of interest in which of the following? a.…
B. Symmetry and mathematical principles in art
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question 11 atomic structure and the periodic table how many atoms of l…
7
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match the picture to its label. groups or families periods
First image: Groups or Families; Second image: Periods
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identify the pair (2) isotopes?
D.
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nitrogen and oxygen are the most abundant gases in earths atmosphere. a…
- The exponent is negative. - The exponent represents the number of places the decimal moves. - The decimal moves to the right.
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label the 3 categories of the periodic table.
- The large blue section: Metals - The pink section: Metalloids - The green section: Non - metals
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elements in the alkali metals group all have 1 valence electron; this m…
have similar chemical and physical properties to each other
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the purpose of a fume hood is store all chemicals use hazardous chemica…
B. Use hazardous chemicals, C. Store hazardous chemicals, D. B and c
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which pair of elements has similar properties? use your periodic table …
Lithium (Li) and Potassium (K)
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the drench shower is used when a person contaminates bench space by spi…
15 minutes
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the model of the periodic table below shows the locations of four eleme…
4
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question 9 (1 point) the number of isomers of 1,2 - dibromo - 3 - chlor…
three ### Question 10
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how can you definitively assess the presence of leached chemicals in so…
by using appropriate testing equipment
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2. the valence electrons in an atom of oxygen in the ground state are a…
2. B) second shell 4. B) 4 6. D) Outermost electrons
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question 7 (1 point) which alkane would most likely be a liquid at room…
pentane # Question 8
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1) the valence electrons in an atom of phosphorus in the ground state a…
1) C. third shell 3) D. 6 5) D. number of valence electrons
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quiz #4 tdsb.elearningontario.ca page 1: 1 -- page 2: 2 -- 3 4 -- 5 -- …
- **Question 5**: IV only - **Question 6**: \(H_3C-\underset{H}{\underset{|}{C}}-OH - CH_3\) (the third option in question 6)
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1) to lower the freezing point of coolant in your automobile engine to …
The mole ratio of water to ethylene glycol is approximately \(1.67:1\).
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question 3 (1 point) which of the following is the correct name for the…
trans - non - 4 - ene # Question 4
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q) for potassium (k), we would expect a large increase in ionization en…
2. a) Ca b) Ga c) As d) Rb 3. a) Mn b) Si c) F d) Sr
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tree roots can break down rock into soil. which type of weathering is t…
Physical
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1. fill in the best answer for each of the following: a) a vertical col…
a) group (or family) b) Dmitri Mendeleev c) atomic number d) periodic law e) \(ns^{2}np^{5}\) f) alkali g) f h) 14 (if considering \(ns^{2}np^{2}\) configuration) i) transition me…
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the occupational safety and health administration (osha) has determined…
\(485\)
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6.61 using electronegativity values in figure 6.11, for each pair of bo…
(a) \(C - O\) is more polar. Polarity: \(\overset{\delta+}{C}-\overset{\delta -}{O}\), \(\overset{\delta+}{C}-\overset{\delta -}{N}\) (b) \(P - Cl\) is more polar. Polarity: \(\ov…
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physical and chemical changes part a can you recognize the chemical and…
1. P 2. C 3. C 4. P 5. C 6. P (melting) and C (reaction) 7. P 8. P 9. C 10. P
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physical and chemical properties and changes name key physical property…
- **Physical/Chemical Property**: 1. P 2. P 3. C 4. P 5. C 6. C 7. P 8. P 9. C 10. P 11. P 12. P 13. P 14. C - **Physical/Chemical Change**: 1. P 2. C 3. P 4. P 5. C 6. C 7. P 8. …
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question 17 (1 point) when placed in water, oil does not dissolve and s…
d. hydrophobic and nonpolar
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which atom has the smallest first ionization energy? c be b o n
B. B
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which of the following atoms is/are paramagnetic in the ground electron…
O. Option O, B. Option B, C. Option C, N. Option N
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which atom has the smallest covalent radius? b c n si p
N
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for a fe²⁺ ion in its ground electronic state: how many electrons are t…
0 6 0 4
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what can happen to solar radiation when it enters earths atmosphere? it…
It is absorbed or reflected as it travels to Earth’s surface.
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for a nickel (ni) atom in its ground electronic state: how many electro…
- Number of electrons in \(4s\) orbital: \(2\) - Number of electrons in \(3d\) orbitals: \(8\) - Number of electrons in \(4p\) orbitals: \(0\) - Number of unpaired electrons: \(2\…
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fill in the blanks. it takes number electrons to fill the 4d subshell o…
10, 32
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which statement describes what happens when ice freezes, according to t…
- First question: The water molecules decrease their speed. - Second question: gas.
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according to the aufbau procedure for neutral atoms: which subshell is …
Before \(6d\): \(5f\) After \(6d\): \(7p\)
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a limericks rhyme scheme is choose one option a abab b aabba c abcde d …
D. AABCB
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question 1 (1 point) which of the following terms represents the smalle…
B. atom
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when a poem does not have a specific rhyme, rhythm, meter and/or length…
D. none of the above
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use the student information sheet to find the answers to the following …
1. groups/families 2. periods 3. metals 4. metalloids 5. non - metals 6. 1; alkali metals 7. 2; alkaline earth metals 8. transition metals 9. halogens; 7 10. noble gases; 8 (or 2 …
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a poetic form is a type of poem that has a specific structure or set of…
A. the ways in which they rhyme
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boyles law states that the pressure of a gas tends to increase as the v…
It is a statement of fact.
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in this passage, scientist richard feynman explains how uranium can be …
But a small percentage of uranium atoms—about 1 out of every 130—have a total of 235 protons and neutrons. This is U - 235.
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complete the sentence with the correct plural. by chemically analyzing …
alloys
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which term correctly describes a reaction in which the energy of the pr…
endothermic
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which of the following statement(s) describe(s) an exothermic reaction?…
- The bonds in the reactants are stronger than the bonds in the products. - \(\Delta H\) is a negative value.
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practice on your own __________ ml
\(3.0\)
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neils bohr stated that move around the nucleus of an atom in distinct l…
First blank: electrons; Second blank: energy
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mr. glancy general chemistry dashboard / my courses / glancy general ch…
nuclear
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when a person ingests caffeine, whether in the form of a cup of coffee …
sequential
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nucleosynthesis in stars (due midnight 10/27) • elements created during…
Fe, Iron
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ernest rutherford proposed that at the center of each atom exists a ver…
positively
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multiple choice 1 point a beaker containing 85 g of water is heated fro…
$q = 3094\ Joules$
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mr. glancy general chemistry dashboard / my courses / glancy general ch…
electron
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multiple choice 1 point a beaker containing 100 g of water is heated fr…
\(q = 4184\space J\) (the option \(q = 4184\space Joules\))
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a block of copper (cu) and a block of iron (fe) of identical mass are h…
Copper
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given the lewis structures provided in the image, which would you expec…
Methane
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which type of writing would most likely require the use of a traditiona…
D. A research essay about the chemical elements found on Mars
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imagine you could collect all of the heat that is transferred out of th…
Neither of them
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question 1 1 pts which scientist proposed the idea of the nucleus after…
Rutherford
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take some water in a beaker at 10°c and let it warm to room temperature…
\(\Delta H\) is positive for warming from \(10^{\circ}C\) and \(\Delta H\) is negative for cooling from \(90^{\circ}C\)
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molecular hydrogen, h₂ may be an excellent alternative to the hydrocarb…
q is negative and \( \Delta H \) is negative.