化學
化學反應、化學計量、分子結構與元素性質。
-
some chemical compounds are listed in the first column of the table bel…
- \(HNO_2\): molecular, weak acid - \(HClO_3\): molecular, strong acid - \(KClO_3\): ionic - \(KOH\): ionic, strong base
-
question 25 (1 point) which of the following products can be created by…
C. Soaps
-
question 23 (1 point) palmitic acid is a saturated fatty acid with 16 c…
C. \(C_{16}H_{32}O_2\)
-
complete the table below by deciding whether a precipitate forms when a…
| solution A | solution B | Does a precipitate form when A and B are mixed? | empirical formula of precipitate | |---|---|---|---| | zinc nitrate | ammonium sulfide | yes | \(ZnS\…
-
question 18 (1 point) what will happen to the volume of a gas if its ab…
C. The volume will triple (increase by a factor of three).
-
question 14 (1 point) identify the characteristic(s) that distinguish w…
Waxes consist of esters of long - chain alcohols with long chain fatty acids, whereas triacylglycerols contain glycerol esterified with three long - chain fatty acids.
-
question 13 (1 point) a gas mixture contains 0.150 mol of oxygen (o₂) g…
C. 41.0 atm
-
a chemist adds 330.0 ml of a 2.84×10^{-5} mm mercury(ii) iodide (hgi_{2…
\(9.37\times 10^{-3}\)
-
calculate the volume in milliliters of a 0.852 mol/l sodium carbonate s…
\(88.0\space mL\)
-
a. the hydroxyl group on carbon 5 moves towards the anomeric carbon, ca…
B. There is rotation about the carbon 4 to carbon 5 bond.
-
question 7 (2 points) when the linear form of a monosaccharide is conve…
None of the above
-
lauric acid is a saturated fatty acid with 12 carbons and no double bon…
B. \(C_{12}H_{24}O_{2}\)
-
black forest biologicals, a biotech startup, has a promising alzheimers…
| Trial | amount of A | | amount of B | | yield of SLT - 88 | | | | --- | --- | --- | --- | --- | --- | --- | --- | | | Initial | final | initial | final | theoretical | actual | …
-
an aluminum atom has a mass of ( 4.48\times10^{-23}) g and a small airp…
The mass of 1 mole of aluminum atoms is \(27.0\text{ g}\). The number of moles of aluminum atoms with the mass of the airplane is \(1.85\times 10^{5}\text{ mol}\).
-
a sample of a gas has a pressure of 0.895 bar when the volume is 318 l.…
C. 2.08 bar
-
a virus has a mass of ( 9.0\times10^{-12} ) mg and an oil tanker has a …
The mass of 1 mole of viruses is \(5.4\times10^{9}\space g\) The number of moles of viruses with a mass equal to the mass of an oil - tanker is \(5.6\space mol\)
-
question 1 (1 point) what is the temperature of a 1.59 l flask containi…
121 K
-
the chemical formulae of some acids are listed in the first column of t…
| acid | strong or weak? | species present at \(10^{-6}\ mol/L\) or greater when dissolved in water | | ---- | ---- | ---- | | \(HClO_{2}\) | weak | \(HClO_{2},H^{+},ClO_{2}^{-},H…
-
a carbon atom was in the atmosphere 300 million years ago as part of a …
carbon dioxide
-
ch9. q1 the quantum mechanical model of the atom ____. o has many analo…
involves the probability of finding an electron in a certain position
-
ch9. q1 the atomic emission spectra of a sodium atom on earth and of a …
the same
-
a chemist prepares a solution of aluminum chloride (alcl₃) by measuring…
\(134\space\mu mol/L\)
-
how many milliliters of a 10.0 m sucrose solution would be needed to pr…
Part 1 of 2: \(58.9\space mL\) Part 2 of 2: \(27.4\space mL\)
-
what is the weight - volume percent concentration of a 90.0% (\\(\\frac…
Part 1 of 2: \(45.0\%\) Part 2 of 2: \(18.0\%\)
-
the quantum mechanical model of the atom ____. defines the exact path o…
involves the probability of finding an electron in a certain position
-
the atomic emission spectra of a sodium atom on earth and of a sodium a…
the same
-
which scientist developed the quantum mechanical model of the atom? erw…
Erwin Schrodinger
-
identifying characteristics of particles at different temperatures two …
The particles in mug A are moving more slowly.
-
a tiny sample of an aqueous solution of two substances r and p is sketc…
number of \(R\) molecules: \(2\) number of \(P\) molecules: \(8\)
-
what was the first, federally - run, off reservation native boarding sc…
Carlisle
-
use the references to access important values if needed for this questi…
- The value of \(K_{c}\): remains the same - The value of \(Q_{c}\): is less than \(K_{c}\) - The reaction must: run in the forward direction to reestablish equilibrium - The numb…
-
use the references to access important values if needed for this questi…
The value of \(K_c\): remains the same The value of \(Q_c\): is greater than \(K_c\) The reaction must: run in the reverse direction to reestablish equilibrium The concentration o…
-
consider the following system at equilibrium where (delta h^{circ}=16.1…
The value of \(K_{c}\) remains the same. The value of \(Q_{c}<K_{c}\). The reaction must run in the forward direction to re - establish equilibrium. The concentration of \(NO\) wi…
-
use the references to access important values if needed for this questi…
- The value of \(K_{c}\): remains the same - The value of \(Q_{c}\): is equal to \(K_{c}\) - The reaction must: remain the same. It is already at equilibrium. - The number of mole…
-
the equilibrium constant, ( k_c ), for the following reaction is 77.5 a…
\([CO]=0.071\space M\) \([Cl_{2}]=0.071\space M\) \([COCl_{2}]=0.381\space M\)
-
use the references to access important values if needed for this questi…
The reaction quotient \(Q_c\) equals \(3.48\times 10^{-6}\). The reaction must run in the forward direction to reach equilibrium.
-
consider the following reaction where ( k_{c}=154 ) at ( 298 mathrm{~k}…
The reaction quotient \(Q_{c}\) equals \(375\). The reaction **B. must run in the reverse direction to reach equilibrium**
-
use the references to access important values if needed for this questi…
\(Q_c = 0.0139\), The reaction must run in the forward direction to reach equilibrium.
-
consider the following reaction where ( k_{p}=6.25 ) at ( 298 mathrm{~k…
1. F 2. F 3. F 4. F 5. F
-
consider the following reaction where ( k_{p}=1.80\times10^{-2} ) at 69…
1. \(T\) 2. \(F\) 3. \(T\) 4. \(T\) 5. \(F\)
-
use the references to access important values if needed for this the eq…
\(K_{p}=0.0103\)
-
arrange the following molecules in order of increasing average molecula…
1. \(Ar\) at \(345\) K 2. \(Ar\) at \(396\) K 3. \(O_{2}\) at \(396\) K 4. \(NH_{3}\) at \(454\) K
-
use the references to access important values if needed for th the equi…
\(0.0180\)
-
use the references to access important values if needed for this questi…
\(SO_{2}<Ar < Ne<NH_{3}\)
-
use the references to access important values if needed for this questi…
\(SO_2<Ar<Ne<NH_3\)
-
match the gas sample on the left with a description on the right. you m…
- \(0.278\) moles of \(SO_{2}\) in a \(5.95\) L container at a temperature of \(443K\): has the highest average molecular speed - \(0.794\) moles of \(SO_{2}\) in a \(5.62\) L con…
-
use the references to access important values if needed for this questi…
- With less available volume, the molecules hit the walls of the container more often. - For a given gas at constant temperature, the force per collision is constant. Some other f…
-
the equilibrium constant, ( k_p ), for the following reaction is ( 1.04…
\(8.63\times 10^{-3}\)
-
consider the following reaction: 2hi(g)h₂(g) + i₂(g) if 1.41 moles of h…
\(0.0279\)
-
use the references to access important values if needed for this questi…
\(21.3\)
-
use the references to access important values if needed for this questi…
With more molecules per unit volume, the molecules hit the walls of the container more often.
-
write the expression for the equilibrium constant ( k_{p} ) for the fol…
\(\frac{(P\ Cl_2)}{1}\)
-
consider the following system at equilibrium where \\( \\delta h = -10.…
Increases
-
bromine is one of the few elements that is a liquid at room temperature…
\(K_{1}=K\), \(K_{2}=\frac{1}{K}\), \(K_{3}=\sqrt{K}\)
-
consider the reaction: c(s) + 1/2o₂(g) ⇌ co(g) write the equilibrium co…
\(K=\frac{K_{1}}{K_{2}}\)
-
consider the following reaction: 2hi(g) ⇌ h₂(g) + i₂(g) if 1.72 moles o…
\(0.0282\)
-
the quantum mechanical model of the atom ____. has many analogies in th…
involves the probability of finding an electron in a certain position
-
which scientist developed the quantum mechanical model of the atom? ern…
Erwin Schrodinger
-
list the type of bond (i, c, m) for each of the following examples cacl…
\(CaCl_{2}\): I, \(CO_{2}\): C, \(MgO\): I, \(H_{2}O\): C, \(KI\): I, \(NaCl\): I, \(Ba(OH)_{2}\): I, \(Na_{3}N\): I, \(KNO_{3}\): I
-
for each chemical reaction in the table below, decide whether the highl…
| reaction | highlighted reactant | |--|--| | \( \text{HSO}_4^-(aq)+\text{NH}_4^+(aq)\to\text{H}_2\text{SO}_4(aq)+\text{NH}_3(aq) \) (highlighted \( \text{NH}_4^+ \)) | Brønsted -…
-
image b on the left occurs at what point during a titration? at the sta…
Only at the endpoint of the titration
-
at - 13.5°c the pressure equilibrium constant ( k_p = 4.4 ) for a certa…
Yes, and $K_p$ will be bigger.
-
methanol and oxygen react to form carbon dioxide and water, like this: …
\(1.6\times 10^{-5}\)
-
nickel carbonyl decomposes to form nickel and carbon monoxide, like thi…
\(0.0020\)
-
which is the ground state electronic configuration of an alkaline earth…
B. \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}\)
-
which is the ground state electronic configuration of an alkaline earth…
B. \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}\)
-
which set of elements is in order from least to most valence electrons?…
B. \(K, As, Br, Kr\)
-
the image below shows an orbital diagram for magnesium. which rule for …
D. Hund's rule
-
the image below shows an orbital diagram for phosphorus. which rule for…
C) Hund's rule
-
consider the width of each block and its relation to the subshell being…
| Subshell | Number of Orbitals | Width of Periodic Block | |---|---|---| | \(s\) | \(1\) | \(2\) | | \(p\) | \(3\) | \(6\) | | \(d\) | \(5\) | \(10\) | | \(f\) | \(7\) | \(14\) |
-
a chemical engineer is studying the following reaction: n₂(g)+3h₂(g)→2n…
- **Vessel A**: - \(N_2\): \(\downarrow\) (decrease) - \(H_2\): \(\downarrow\) (decrease) - \(NH_3\): \(\uparrow\) (increase) - **Vessel B**: - \(N_2\): \(\uparrow\) (increase) - …
-
elements elements in order of decreasing electronegativity as,s,se si,s…
For \(As,S,Se\): \(S>Se>As\) For \(Si,S,P\): \(S > P>Si\)
-
in each of the molecules drawn below one chemical bond is colored red. …
1. \( F\) 2. \( N\) 3. \( O\)
-
arrange the compounds below in decreasing order of the lonic character …
\(NaCl\) (1), \(CaCl_{2}\) (2), \(AlCl_{3}\) (3), \(PCl_{3}\) (4)
-
two main - group elements are highlighted in the outline of the periodi…
1. Element \(X\) 2. Element \(X\) 3. Element \(Y\)
-
two main - group elements are highlighted in the outline of the periodi…
Element X; Element Y; Element X
-
two main - group elements are highlighted in the outline of the periodi…
1. Element \(X\) 2. Element \(X\) 3. Element \(Y\)
-
for the chemical reaction mathrm{hclo}_{4}(mathrm{aq})+mathrm{naoh}(mat…
net ionic equation: $\ce{H+(aq) + OH-(aq) \to H2O(l)}$ Spectator ions: $\ce{ClO4-}$, $\ce{Na+}$
-
chemistry: fundamentals and principles davidson presented by macmillan …
- Strong acid: \(HCl\), \(H_2SO_4\) - Weak acid: \(H_2SO_3\), \(H_3BO_3\) - Strong base: \(NaOH\), \(Ca(OH)_2\) - Weak base: \(NH_3\)
-
strontium chloride and sodium fluoride react to form strontium fluoride…
volume: \(421\space mL\) moles of \(SrF_2\): \(0.141\space mol\)
-
question 1 of 27 the balanced equation for the reaction of aqueous ( ma…
\(27.0\space g\)
-
using the appropriate bond energies, calculate the heat of reaction (de…
\(-818\space kJ/mol\)
-
element #1 element #2 compound formed? chemical formula lithium barium …
| element #1 | element #2 | compound formed? | chemical formula | | --- | --- | --- | --- | | lithium | barium | neither | | | cesium | calcium | neither | | | magnesium | iodine …
-
below is the lewis structure of the acetylene $(c_{2}h_{2})$ molecule. …
bonding pairs: \(4\)
-
below is the lewis structure of the acetylene (c₂h₂) molecule. h:c:::c:…
bonding pairs: 3, lone pairs: 0
-
below is the lewis structure of the bicarbonate $(\\text{hco}_{3}^{-})$…
bonding pairs: \(2\), lone pairs: \(2\)
-
below is the lewis structure of the methane (ch₄) molecule. h h:c:h h c…
bonding pairs: 1 lone pairs: 0
-
during world war i, british and american warships were at grave risk of…
problem - solution
-
person ingests caffeine, whether in the form of a cup of coffee or tea,…
sequential
-
write a balanced chemical equation for each a) when aluminum metal reac…
a) \(2Al + Fe₂O₃ = Al₂O₃ + 2Fe\) b) \(2Na₃PO₄ + 3CaCl₂ = 6NaCl + Ca₃(PO₄)₂\) c) \(2C₈H₁₈ + 25O₂ = 16CO₂ + 18H₂O\)
-
the graph shows the estimated boiling point y, in degrees celsius, of a…
B. A straight - chain alkane with a molecular weight of 152.08 grams per mole has an estimated boiling point of 191.38 degrees Celsius.
-
select all of the statements that are examples of technology in science…
chemists using a computer program to analyze data from their experiments, physicists using a water tank to observe the way waves interact with a model vehicle, geologists using a …
-
a chemistry student weighs out 0.0720 g of formic acid (hcho₂) into a 2…
\(8.24\space mL\)
-
predict the products of the reaction below. that is, complete the right…
\(2HNO_3+Ba(OH)_2 ightarrow Ba(NO_3)_2 + 2H_2O\)
-
predict the products of the reaction below. that is, complete the hno_{…
$\ce{2HNO3 + Ba(OH)2->Ba(NO3)2 + 2H2O}$
-
the following chemical reaction takes place in aqueous solution: 2agno₃…
\(2Ag^{+}(aq)+CO_{3}^{2 - }(aq)\to Ag_{2}CO_{3}(s)\)
-
the following chemical reaction takes place in aqueous solution: 2agno₃…
$$2Ag^{+}(aq)+CO_{3}^{2 -}(aq)\to Ag_{2}CO_{3}(s)$$
-
the following chemical reaction takes place in aqueous solution: agf(aq…
\(\text{Ag}^+(aq)+\text{Br}^-(aq)\to\text{AgBr}(s)\)
-
properties objective e 1. determine whether each expression is a linear…
1. a. Yes; b. Yes; c. No; d. Yes 2. a. \(C = 0.75x+0.45y\); b. Discrete 3. a. \(C = 1.29x + 0.79y\); b. Continuous 4. 20 5. a. \(10x\); b. \(2.5y\); c. \(10x + 2.5y\); d. \(0.35\)…
-
the following chemical reaction takes place in aqueous solution: mgbr₂(…
\(Mg^{2 + }(aq)+2OH^{-}(aq)\to Mg(OH)_2(s)\)