Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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which of the following is/are considered a homogeneous mixture? a noodl…
d. Both b and c
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which of the following statements about homogenous mixtures are true? a…
d. All of the above
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when 1 mol of a fuel burns at constant pressure, it produces 3452 kj of…
$\Delta H=-3452\ \text{kJ}$ and $\Delta U=-3463\ \text{kJ}$
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water covers most of earths surface. the diagram shows the structure of…
covalent bonds formed by shared electrons between atoms
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which property of water best explains how salt is able to dissolve easi…
Water is a polar molecule.
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potassium contains 20 neutrons. how many electrons does it contain? 39 …
For the first question: 19 For the second question: nucleic acid
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what type of bonds form between the oxygen and hydrogen atoms between d…
hydrogen
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which side of the water molecule has a positive charge? hydrogen oxygen
hydrogen
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what does it mean that the oxygen atom is electronegative? oxygen has a…
Oxygen has a STRONG pull on electrons
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the diagram shows water at the molecular level. what property of a wate…
the polarity of the molecule, which involves a slightly negative oxygen atom and slightly positive hydrogen atoms
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hobie draws the following model of a carbon atom. which change to the m…
Move the protons and neutrons to a small space in the center.
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in hydrogen peroxide (h₂o₂), which option best shows how the atoms are …
\(H - O - O - H\) (the last option)
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methanes chemical formula is ch₄. is there a bond between any of the hy…
No, there is not because carbon needs four bonds, so it bonds with each hydrogen atom. Hydrogen only forms one bond.
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use your knowledge of valence electrons and how they affect bonds to fi…
O=C=O
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how do valence electrons impact the type of bonds an atom makes? (1 poi…
An atom wants a full outer shell of valence electrons, so it will either transfer or share electrons depending on what the other atom needs.
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how many electrons does hydrogen have in its valence shell when it is f…
two
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5. you have a solution mixed at a concentration of 5 g/ml and need 100 …
Take \(80\) gallons of the \(5\ g/ml\) solution and add \(20\) gallons of diluent (such as water) to make \(100\) gallons of the \(4\ g/ml\) solution.
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look at this sentence. the hunters identified traces of the deer in the…
1. tracks or other signs left behind by the passing of a person or animal
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4. a mole is a strange unit of measurement giving the amount of a subst…
Take \(10\space ml\) of the \(10^{-3}\space mol/L\) solution and add water to make the volume \(100\space ml\).
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4. a mole is a strange unit of measurement giving the amount of a subst…
\(7500\) bacteria are in the original solution.
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the formula for sulfate differs from the formula for sulfite in: number…
number of oxygen atoms
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current attempt in progress does the fact that two elements combine in …
No, because the charges on the ions are equal in magnitude (but not necessarily \(1\)) in one - to - one compounds.
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current attempt in progress what must happen in order to convert an ato…
1. electrons 2. cation 3. anion
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(b) lead(ii) oxide has been added to glass to make crystal that glisten…
Lead(II) oxide: \(PbO\), Lead(II) acetate: \(Pb(C_{2}H_{3}O_{2})_{2}\)
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(a) flake white was a white pigment used by renaissance artists, which …
\(PbCO_{3}\) (for lead(II) carbonate) and \(Pb(OH)_{2}\) (for lead(II) hydroxide)
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question 15 of 25 policles current attempt in progress name this acid: …
Phosphoric acid
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which property describes a materials ability to be rolled or pressed in…
B. Malleability
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the specific temperature at which a substance changes its state from a …
C. Melting Point
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name snf₂ by the stock (iupac) system.
Tin(II) fluoride
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name the following binary compound composed of nonmetals: i4o9
Tetraiodine nonoxide
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current attempt in progress name the following binary compound composed…
Aluminum oxide
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current attempt in progress write formula for the following binary comp…
\(Na2Se\)
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write formula for the following binary compound composed of nonmetals: …
\( SO3 \)
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complete the table, filling in each box with the proper formula. (formu…
| Ion | \(Br^{-}\) | \(O^{2 -}\) | \(NO_{3}^{-}\) | \(PO_{4}^{3 -}\) | \(CO_{3}^{2 -}\) | |---|---|---|---|---|---| | \(K^{+}\) | \(KBr\) | \(K_{2}O\) | \(KNO_{3}\) | \(K_{3}PO_{4…
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current attempt in progress sulfur dioxide is a gas formed as a by - pr…
No, the existence of sulfur dioxide (\(SO_2\)) and sulfur trioxide (\(SO_3\)) does not violate the law of multiple proportions.
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name formula n^{3-} no_{2}^{-} etextbook and media (b) nitrite and nitr…
First row (top - part): Nitride (\(N^{3 -}\)), Nitrite (\(NO_{2}^{-}\)). Second row (part (b)): Nitrite (\(NO_{2}^{-}\)), Nitrate (\(NO_{3}^{-}\)).
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(c) a sn⁴⁺ ion? protons electrons
protons: \(50\) electrons: \(46\)
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(b) a sn²+ ion? protons electrons
protons: \(50\) electrons: \(48\)
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current attempt in progress how many of each type of subatomic particle…
protons: 50 electrons: 50
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match each of the following to the correct use in naming inorganic comp…
1. ic 2. hypo 3. per 4. ide 5. ate 6. ous 7. Roman numerals 8. ite
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(c) name is, formula is
Name is phosphorus pentachloride, formula is \(PCl_{5}\)
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question 2 of 25 name is , formula is
Name is boron trifluoride, formula is \( BF_3 \)
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write the formulas and name for each of the following compounds: (formu…
Name is carbon tetrabromide, formula is CBr4.
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4. how much has the hydrogen ion concentration changed in a solution if…
The hydrogen - ion concentration has increased by a factor of \(100\).
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question 3 what evidence found in the summit rock led geologists to its…
the presence of crinoid fossils in the rock
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3. hydrochloric acid (hcl), a strong acid, is added to a beaker of pure…
a. The pH of pure water is \(7\). b. The hydrogen - ion concentration increases after the acid is added. c. The pH of the solution in the beaker decreases as the acid is added.
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2. indicate whether the following ph values represent an acidic, basic …
a. pH 0: acidic (most acidic) b. pH 12: basic c. pH 7: neutral d. pH 3: acidic
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1. **a student is working with liquid acetone (boiling point = 56°c, so…
Mixture (sand + acetone + water) $\xrightarrow{\text{Filtration}}$ Sand + (Acetone + Water) mixture $\xrightarrow{\text{Distillation}}$ Acetone + Water ### Question 2
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*remember: isoelectronic means the same # of electrons, which also mean…
s: 1. **Question 1**: \(c. Na^{+1}\) 2. **Question 2**: \(a. S^{-2}\) and \(Cl^{-1}\)
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1. fill in symbol and the number of valence electrons for the following…
1. | Neutral Atom | Symbol | Number of valence electrons | |--|--|--| | Aluminum | Al | 3 | | Chlorine | Cl | 7 | 2. c 3. b 4. (There is an error in the problem as the sum of elec…
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u2l14_exit ticket: for each of the following elements, write the full e…
| Element | Full \( e^{-} \) configuration | Orbital notation | Noble gas config | |---|---|---|---| | \( Si(14e^{-}) \) | \( 1s^{2}2s^{2}2p^{6}3s^{2}3p^{2} \) | \( \frac{\uparrow…
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directions: fill in the missing information for a given element. 1. ** …
1. \(P^{3 -}\) 2. \(K^{+}\) 3. \(F^{-}\) 4. \(0\) (or \(Ne\) with no charge symbolically) 5. \(S^{2 -}\)
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the fabric changes looking closer 15. identify complete the table to id…
- Chalk: chemical property - Ice cream: physical property - Tin: physical property - Paper: chemical property - Liquid water: physical property - Car door: chemical property - Hel…
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select the correct answer. based on your knowledge of word parts, compl…
A. equaled
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which statement is the most effective claim? organic foods are a health…
Organic foods are a healthier option than conventional foods.
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question 95 (2 points) ✓ saved what is a supportive treatment for a cli…
Question 95: Transfuse fresh frozen plasma. Question 96: Peripheral neuropathy. Question 97: A positive Babinski reflex, where the client has flaring of the toes in response to st…
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a $_{55}^{133}cs^{+}$ ion has _______ protons, _______ neutrons, and __…
E. \(55;78;54\)
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a _{55}^{133}cs^{+} ion has ________ protons, ________ neutrons, and __…
E. \(55;78;54\)
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2. fermium - 253 has a half - life of 3 days. use color to represent a …
0 half - lives = \(0\) days, 1 half - life = \(3\) days, 2 half - lives = \(6\) days.
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question 33 (1 point) what is the hybridization of either carbon in c₂h…
E. \(sp\); linear
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question 32 (1 point) listen which statement accurately reflects a π bo…
A. It can be described by the overlap of unhybridized $p$ atomic orbitals from each atom.
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question 31 (1 point) which molecule has a central atom that is ( sp^{3…
d) \(H_2S\)
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question 29 (1 point) what is the bond angle for nh3? <109.5° 120° 180°…
\(< 109.5^{\circ}\)
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question 27 (1 point) how many atoms are bonded to the central atom of …
B. 3
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question 26 (1 point) listen what is the electronic geometry of the cen…
tetrahedral
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gold (au) can form 2 ions: au+ and au3+. which of the following is corr…
The \(Au^{+}\) ion forms when one electron is lost from the 6s orbital. The \(Au^{3+}\) ion forms when 3 electrons are lost (1 from 6s and 2 from 5d). So the correct statements ar…
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question 23 (1 point) which of the following neutral atoms has three un…
Sb.
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question 21 (1 point) which of the following atoms is paramagnetic in t…
C # Question 22
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answer the following questions regarding the magnetism lab. question 20…
at least one unpaired electron
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question 9 (1 point) listen if you were asked to measure out approximat…
\(10\ \text{mL}\) graduated cylinder
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please read the meniscus volume on the 10 ml graduated cylinder shown o…
\(4.2\space mL\)
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consider the 10 ml graduated cylinder. when recording a volume from thi…
tenth decimal
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question 4 (1 point) listen consider the 100 ml graduated cylinder. whe…
To the tenths place (one decimal place).
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which of the following measurements does not have four significant figu…
- The measurement that does not have four significant figures is \(0.022\) g. - The result of \(3.56 - 4.321+5.9486\) with appropriate significant figures is \(5.19\)
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what element is represented in the orbital diagram below?
Fluorine
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how many valence electrons are there in this element? aluminum
3
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this rule states that there can be a maximum of two electrons per orbit…
Pauli's Exclusion Principle
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this rule states that electrons must be placed in the lowest energy lev…
Aufbau's Principle
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which element has similar chemical reactivity to the element in the dia…
Boron
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which element has the same number of valence electrons as the element i…
Cesium
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for which element is the orbital diagram? oxygen nitrogen fluorine neon
Nitrogen
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which orbital is closest to the nucleus? 1s²2s²2p³ 2p all the same ener…
1s
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how many valence electrons? 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p⁶6s²4f¹⁴5…
\(18\)
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which element is this for? 44 phosphorus lithium carbon nitrogen
Nitrogen
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question 1 of 37 balance the following chemical equation (if necessary)…
\(2C_3H_6(g)+9O_2(g)\to6CO_2(g)+6H_2O(g)\)
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write a balanced chemical equation based on the following description: …
\(6Cs(s)+2CsNO_2(s)\to4Cs_2O(s)+N_2(g)\)
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write a balanced chemical equation based on the following description: …
\(10Cs(s)+2CsNO_{2}(s)=6Cs_{2}O(s)+N_{2}(g)\)
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write a balanced chemical equation based on the following description: …
\( \text{Pb(ClO}_2\text{)}_4(s) ightarrow \text{PbCl}_4(s)+4\text{O}_2(g) \)
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write a balanced chemical equation based on the following description: …
\(Sn(s)+O_2(g)=SnO_2(s)\)
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aktiv will undergo scheduled maintenance on oct 19 from 5am to 8am et. …
$\ce{Sn(s) + O2(g) ightarrow SnO2(s)}$
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write a balanced chemical equation based on the following description: …
\(2SO_2(g)+2K_2Te(s)\to S_2Te_2(g)+2K_2O(s)\)
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write a balanced chemical equation based on the following description: …
\(2SO_2(g)+4K_2Te(s) ightarrow 2S_2Te_2(g)+4K_2O(s)\)
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write a balanced chemical equation based on the following description: …
\(2Y(s)+N_2(g)\to 2YN(s)\)
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aktiv will undergo scheduled maintenance on oct 19 from 5am to 8am et. …
\(2Y(s)+N_2(g)\to 2YN(s)\)
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write a balanced chemical equation based on the following description: …
\(2C_{7}H_{8}O(l)+17O_{2}(g)\to14CO_{2}(g)+8H_{2}O(g)\)
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question 5 a system with decreasing entropy has: chemical energy increa…
increasing order
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write a balanced chemical equation based on the following description: …
$$\ce{2C_{7}H_{8}O(l) + 17O_{2}(g) -> 14CO_{2}(g) + 8H_{2}O(g)}$$
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write a balanced chemical equation based on the following description: …
$$\mathrm{2C_7H_8O(l) + 17O_2(g) ightarrow 14CO_2(g)+8H_2O(g)}$$
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write a balanced chemical equation based on the following description: …
\(4Fe(s)+3O_2(g)\to 2Fe_2O_3(s)\)
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write a balanced chemical equation based on the following description: …
\(C_3H_7COOH(l)+5O_2(g) ightarrow4CO_2(g)+4H_2O(g)\)