化學
化學反應、化學計量、分子結構與元素性質。
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circle the letter 1. an ionic bond is a. attraction of an atom for its …
C. a force that holds together atoms that are oppositely charged.
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a bunsen burner flame is a combustion reaction whose heat energy can be…
First Law of Thermodynamics
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dissolving an ionic compound in water usually results in an increase in…
Second Law of Thermodynamics
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diamond is a network solid with a very consistent crystal structure and…
Third Law of Thermodynamics
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13.molecules containing only polar covalent bonds a. are always polar. …
b. may or may not be polar.
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in your textbook, read about bond polarity. using the table of electron…
C. a polar covalent bond.
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how many grams of nitrogen, n2, would be required to react with 6.25 mo…
\(58.4\space g\)
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how many grams of aluminium, al, would be required to react with 4 mole…
\(216\space g\)
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p₂o₃ + 3h₂o → 2h₃po₃ how many grams of diphosphorus trioxide, p₂o₃, are…
\(146.59\space g\)
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c + 2f₂ → cf₄ how many grams of carbon tetrafluoride, cf₄, are produced…
\(176.02\space g\)
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n₂ + 3h₂ → 2nh₃ how many grams of nitrogen, n₂, would be required to cr…
\(130.3\space g\)
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how many grams of oxygen gas (o2) are needed to completely react with 9…
\(223.2\space g\)
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4al + 3o₂ → 2al₂o₃ 9.30 mol al | 3 mol o₂ / 4 mol al | ? / ? = ? g o₂ w…
\(\frac{32.0\ g\ O_2}{1\ mol\ O_2}\)
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in - class problems: week 14 (include last names!) name: _honay ortiz n…
Circle reactions \(a\) and \(d\).
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4al + 3o₂ → 2al₂o₃ 9.30 mol al|?|?|? g o₂ what conversion should be use…
\(\frac{3\space mol\space O_2}{4\space mol\space Al}\)
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we want to find out how many grams of oxygen gas (o₂) are needed to com…
grams \(O_2\)
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2. the bond angle is the angle between a. the sigma and pi bonds in a d…
C. two terminal atoms and the central atom.
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we want to find out how many grams of oxygen gas (o₂) are needed to com…
9.30 mol Al
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17 when calcium carbonate (caco3) is heated, it decomposes to form calc…
C. equals the mass of CaO plus the mass of CO₂
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16 chemical x has a mass of 5 grams, and chemical y has a mass of 10 gr…
\(15\space g\)
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14/7n + 16/8o → 30/15? drag & drop the answer 10 23 12 27 24 3 note: us…
B. Phosphorus
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13 here is an example of a balanced chemical equation = 2h₂ + 1o₂ → 2h₂…
\(2\), \(3\), \(2\)
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12 five chemical reactions are listed in the table below. reaction 1 ca…
A. Reaction 1, C. Reaction 4
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question 1 of 25 which of these is an advantage of using natural gas? a…
A. It burns more cleanly than coal or oil.
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10 which type of reaction is the equation: a + b → ab a single replacem…
B. Synthesis
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9 during an experiment, zinc and sulfur chemically react to form zinc s…
A. \(Zn + S ightarrow ZnS\)
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8 how does a balanced chemical equation satisfy the law of conservation…
D. During a chemical reaction, the total amount of matter stays the same.
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how many moles of kcl are produced at the same time as 9 moles o₂? 2kcl…
\(6\)
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how many moles of o2 are required to generate 12 moles so2 gas? 2cufes2…
\(15\)
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how many moles of pb(no3)2 are required to generate 12 moles al(no3)3? …
\(18\)
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balance the following equation: (make sure each blank has a number) (sq…
\(1\) \(Al_2O_3+6\) \(NaCl ightarrow2\) \(AlCl_3 + 3\) \(Na_2O\)
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how many moles of pbcl₂ are produced when 16 moles alcl₃ are consumed? …
\(24\)
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how many moles of fe are required to form 12 moles of fes? 2fe + 2s → 2…
\(12\)
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balance the following chemical equation by placing coefficients in fron…
\(2\) \(1\) \(2\) \(1\)
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how many moles of fe are required to form 12 moles of fes? 2fe + 2s → 2…
\(12\space mol\)
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how many moles of o₂ are needed to react with 24 moles of c₂h₆? 2c₂h₆ +…
\(84\) moles \(O_{2}\)
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which of the following processes occurs when a substance changes phase …
B. sublimation
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carbon - 14 is an example of an a isotope. b isobar. c allele. d alloy.
A. isotope
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let me not to the marriage of true minds admit impediments; love is not…
B. \(ABAB\)
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what is the aesthetic impact of a poem? (1 point) the meter and rhyme s…
how the poem affects the reader’s senses
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what is rhyme scheme? (1 point) a set of two rhyming lines the ordered …
the ordered pattern of rhymes at the ends of lines of a poem
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use the unbalanced chemical equation to answer the question. 2nahco₃ → …
\(H_2O\)
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one molecule of bromine (br₂) and two molecules of potassium chloride (…
six
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matter interactions unit test which procedure could be used to demonstr…
Find the mass of a piece of ice. Let the ice melt. Find the mass of the liquid water.
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periodic table what is the density of carbon monoxide gas at stp condit…
A. 1.3 g/L
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periodic table how many moles of helium would you find in a birthday ba…
D. \(0.28\) moles
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how many moles of o₂ are needed to react with 24 moles of c₂h₆? 2c₂h₆ +…
\(84\)
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multiply across the bottom of the unit conversion. what is the product …
\(2\)
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4. give an example of a physical and a chemical change that occurs when…
Physical change: Melting of marshmallow. Chemical change: Toasting (browning/blackening) of marshmallow.
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multiply across the top of the unit conversion. what is the product of …
168
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we want to find out how many moles o₂ are needed to react with 24 moles…
The second set - up \( \frac{24\ mol\ C_{2}H_{6}\times7\ mol\ O_{2}}{2\ mol\ C_{2}H_{6}}\) is correct.
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a teacher has given a lab student a white chemical sample and asks her …
\(46.8\)
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periodic table a reaction requires 2.5 moles of zinc oxide. how many gr…
C. $203.5\ g$
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what does humus contribute to soil? it kills off living organisms. it p…
It enriches organic matter.
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3. most changes can be clearly defined as physical or chemical. dissolv…
Dissolving can have characteristics of both physical (e.g., change in state of solute) and chemical (e.g., interaction between solute and solvent) changes, so it's hard to classif…
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what is humus? a type of worm that only lives in the soil mineral matte…
substance from decaying organic material
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2. what is the main difference between physical and chemical change? (p…
The main difference is that in a physical change, no new substances are formed, while in a chemical change, new substances are formed.
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sodium reacts with chlorine to form the compound sodium chloride, or sa…
\(58.44\) amu (the third option)
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matter interactions unit test how does a balanced chemical equation dem…
it shows that no atoms have been gained or lost during the reaction
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how are chemical changes different from physical changes? (1 point) the…
They form new substances.
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matter interactions unit test a student cuts some fabric into two piece…
It is a physical change because there is no reaction.
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1. how would you explain the difference between an intensive property o…
An intensive property (e.g., density) is independent of the amount of matter. An extensive property (e.g., mass) depends on the amount of matter.
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why are sodium (na) and potassium (k) in the same group on the periodic…
They have similar reactivity.
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matter interactions matter interactions unit test which element has the…
chlorine (Cl)
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in a molecule of lithium sulfide, there are two atoms of lithium and on…
The atoms in lithium sulfide are held together by bonds.
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cobalt has a mass number of 59 and an atomic number of 27. a student wa…
The model should show 27 protons and 32 neutrons.
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which statement about an atom is correct? (1 point) the electron has a …
The electron has a negative charge and is found outside of the nucleus.
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use the chemical equation to complete the activity. 2cu + s → cu₂s copp…
The scientist used the law of conservation of mass.
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matter interactions matter interactions unit test the image is a model …
Molecular models help visualize the structure of substances, which is crucial for understanding their properties and behaviors.
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in a chemical reaction, two molecules with a total mass of 76 amu react…
76 amu
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use the equation and the table to answer the question. fecl₃ + 3h₂o → f…
215 amu
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k₃po₄ → 3k⁺ + po₄⁻³ what is the mole ratio between the potassium ion an…
\(1\)
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k₃po₄→3k⁺ + po₄⁻³ what is the mole ratio between the potassium ion and …
\(3\)
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conservation in chemical reactions quick check which statement is true …
The total number of atoms does not change, so mass is conserved in the reaction.
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3h₂so₄ + 2b(oh)₃ → b₂(so₄)₃ + 6h₂o what is the denominator of the mole …
\(3\)
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conservation in chemical reactions quick check in which chemical equati…
\(Zn + 2HCl \to H_2 + ZnCl_2\)
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3h₂so₄ + 2b(oh)₃ → b₂(so₄)₃ + 6h₂o what is the numerator of the mole ra…
\(1\)
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part c: draw a correct lewis structure for co₂.
\(O = C=O\) (with each oxygen having 2 lone pairs)
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2nano₃ + pbo → pb(no₃)₂ + na₂o what is the mole ratio between lead(ii) …
\(1\)
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2nano₃ + pbo → pb(no₃)₂ + na₂o what is the mole ratio between lead(ll) …
\(1\)
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part b: the diagram below shows an incorrect model of co, identify one …
One error is that the diagram shows single bonds (\(O - C - O\)) instead of double bonds (\(O = C = O\)). Carbon needs to share 4 electrons (in \(CO_2\), two double bonds) to comp…
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law of conservation of matter quick check a student combines two liquid…
The reaction produced a gas that escaped the beaker.
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c₂h₅oh + 3o₂ → 2co₂ + 3h₂o + 1367 kj what is the ratio between the ener…
\(455.7\)
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law of conservation of matter quick check what is always true according…
Atoms can be rearranged during a chemical reaction but cannot be added or taken away.
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c₂h₅oh + 3o₂ → 2co₂ + 3h₂o + 1367 kj what is the mole ratio between wat…
2
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which procedure could be used to demonstrate that matter is conserved d…
Find the mass of an acid and a base. Combine them to produce water and a salt. Find the mass of the water and salt.
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law of conservation of matter quick check suppose 10 atoms of carbon (c…
30
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name: block: date: unit: energy in chemical reactions lesson: covalent …
Carbon forms two double covalent bonds in \(CO_2\) to achieve a stable electron configuration (octet rule). With double bonds, carbon (4 valence electrons) gains 4 electrons (tota…
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examples of solutes include..... (click on all that apply) salts. sugar…
salts, sugars
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which of the following is the correct way to describe the ratio of part…
2 atoms Na : 1 molecule \(Cl_{2}\) : 2 formula units NaCl
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which of the following is a possible way to describe the hcl component …
\(2\ moles\ HCl\)
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which of the following is the correct way to describe the ratio of volu…
\( 2LNH_{3}:1LN_{2}:3LH_{2} \) (the third option)
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which of the following is a possible way to describe the ca(oh)₂ compon…
1 formula unit \(Ca(OH)_2\)
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which of the following is a possible way to describe the hcl component …
2 molecules \(HCl\)
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which of the following is a possible way to describe the components in …
\(2\) atoms \(Ag:1\) molecule \(I_{2}:2\) formula units \(AgI\)
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which of the following is a possible way to describe the components in …
2 atoms Ag : 1 molecule \(I_{2}\) : 2 formula units AgI
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2ag(s) + i₂(s) → 2agi(s) what is the correct ratio of particles of the …
2 atoms \(Ag\): 1 molecule \(I_{2}\): 2 formula units \(AgI\)
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2ag(s) + i₂(s) → 2agi(s) what is the correct ratio of moles of the subs…
\(2\) moles \(Ag:1\) mole \(I_2:2\) moles \(AgI\) (the fourth option)
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which of the following is a correct pairing of particle type and name? …
element - atom
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published on cookinglight.com, 2016: heres the situation: atural\ on fo…
Yes, because it fails to cite the source.