Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
-
select the best answer: hydrogen bonds dont involve electrons being sha…
Hydrogen bonds don't involve electrons being shared or transferred.
-
the stronger the intermolecular forces, the more strongly molecules are…
Hydrogen bonding
-
unlike ionic or covalent bonding, where electrons are transferred or sh…
There are attractions between two or more small, simple molecules
-
take a look at the pairs of molecules having dipole - dipole interactio…
- Hydrogens are the positive dipoles of all the molecules. (True) - The oxygen, nitrogen, and fluorine atoms are the negative dipoles of the molecules. (True)
-
practice: dipole - dipole forces 3 you said that the molecules to the r…
Yes. Polar molecules experience dipole - dipole interactions with other polar molecules.
-
take a look at the lewis structures of the molecules below. based on sh…
\(O = S = O\) (Shape: Bent), \(C\equiv O\) (Shape: Linear)
-
whether or not a molecule is polar depends both on the kinds of bonds i…
A molecule with polar covalent bonds that does not have charges cancelled out due to its shape
-
how does this force affect the phase of substances? on the previous scr…
The larger the molecule, the larger the electron cloud. The larger the electron cloud, the more it can be distorted. The larger the molecule, the stronger the London dispersion fo…
-
molecule size and induced dipoles the larger the molecule, the greater …
Chlorine, bromine, iodine
-
lets start by looking at one type of intermolecular force called london…
They're due to the temporary accumulation of electrons in an area of a molecule.
-
what volume (ml) of 3.751 m hbr(aq) solution would contain 1.00×10²⁴ mo…
\(443\text{ mL}\)
-
what conclusion can you draw from the fact that hugs produce a positive…
People need positive contact with others to thrive.
-
label the parts of this flavored drink mixture appropriately.
The larger pink particles are the Solute. The liquid in which they are dissolved is the Solvent. The overall mixture is the Solution.
-
fill in the blanks to balance this chemical reaction. ____ h2so4 + ____…
\(1H_2SO_4+2NaNO_2 ightarrow2HNO_2 + 1Na_2SO_4\)
-
fill in the blanks to balance this chemical reaction. ______ p + ______…
\(4P + 5O_2 ightarrow2P_2O_5\)
-
fill in the blanks to balance this chemical reaction. ____ h3po4 + ____…
\(2\) \(H_3PO_4+3\) \(Ca(OH)_2 ightarrow1\) \(Ca_3(PO_4)_2 + 6\) \(H_2O\)
-
fill in the blanks to balance this chemical reaction. ______ li + _____…
\(3\) \(Li+1\) \(AlCl_3 ightarrow3\) \(LiCl + 1\) \(Al\)
-
fill in the blanks to balance this chemical reaction. _______ rb + ____…
\(3Rb+1P ightarrow1Rb_3P\)
-
count the number of atoms for each element in the following term: 2hco₃…
There are \(2\) atoms of hydrogen, \(2\) atoms of carbon, and \(6\) atoms of oxygen.
-
which of the following statements accurately represents what is occurri…
First option: If 6 atoms of Cs react with 1 molecule of \(N_2\), they should produce 2 molecules of \(Cs_3N\). Second option: 6 moles of Cs can react with 1 mole of \(N_2\) to pro…
-
lets focus in on one segment of the balanced chemical reaction below: p…
D. There are 12 hydrogen atoms in this term. E. 4 is a coefficient that describes the ratio of this molecule to others in the equation. F. There are 16 oxygen atoms represented by…
-
label the different parts of a chemical reaction. a product a reactant …
A. The reactants side B. A coefficient C. A reactant D. Phase E. A coefficient F. A product
-
take a look at this chemical equation. does it obey the law of conserva…
No, because the number of oxygen atoms on both sides of the equation is not balanced.
-
an addictive substance being analyzed in the lab has a molar mass of 16…
The empirical formula is \(C_{5}H_{7}N\)
-
find the empirical formula. an addictive substance being analyzed in th…
\(C_5H_7N\)
-
skills check checkpoint ii find the molecular formula of an unknown sug…
\(C_6H_{14}O_6\)
-
checkpoint 1 find the empirical formula. there is an oxide of chromium …
$Cr_2O_3$
-
how can you determine the molecular formula of this molecule? your empi…
\(N_4O_6\)
-
how can you determine the whole - number mole ratio in this substance? …
The empirical formula with whole - number subscripts is \(N_2O_3\)
-
can you convert these mole values into a whole - number mole ratio? bas…
The subscripts for the empirical formula are approximately $N_1O_{1.5}$.
-
can you convert these gram values into moles? it seems like there is re…
\(N = 2.63\space mol\) \(O = 3.95\space mol\)
-
lets say an unknown substance in the lab is shown to be composed of 36.…
The molecular formula of the substance is $N_4O_6$
-
use the weight of the molecule to determine the molecular formula. the …
\(C_8H_{10}N_4O_2 = 194\) amu
-
the empirical formula doesnt tell us how many atoms are in the molecule…
\(97.1\) amu
-
now, it seems that for every 1 mole of oxygen, there are 4 moles of car…
\(C_4H_5N_2O\) (the third option \(C_4H_5N_2O\) is correct)
-
based on what you now know about the different formulas, lets see how t…
Either A or C
-
youve classified reactions as one of the five types and determined whic…
Decomposition, Combination, Single Replacement, Combustion
-
theres an additional guideline for recognizing redox reactions. when so…
Combustion
-
now you know how to recognize redox reactions. add a label to additiona…
1. Decomposition 2. Combination 3. Single Replacement 4. Double Replacement
-
what is the concentration of sodium ions in 0.325 m na₂co₃?
\(0.650\space M\)
-
6. which is an acute, reversible, organic disorder that has symptoms of…
6. Delirium 7. Brain tissue examination 8. Early stage
-
use what youve learned so far to pick which of the following reactions …
\(KOH(aq)+HNO_3(aq)\to KNO_3(aq)+H_2O(l)\) and \(HCl(aq)+NaOH(aq)\to NaCl(aq)+H_2O(l)\) are neutralization reactions.
-
to understand neutralization reactions, youll first need to know what a…
Acids: \(HCl\), \(H_{2}SO_{4}\) Bases: \(NaOH\), \(KOH\)
-
neutralization reactions when you think of the term neutralization, wha…
Two things cancel each other out.
-
from your work on the previous screen, you saw that double - replacemen…
\(Pb(NO_3)_2(aq)+2KI(aq) ightarrow 2KNO_3(aq)+PbI_2(s)\) and \(BaCl_2(aq)+Na_2SO_4(aq) ightarrow BaSO_4(s)+2NaCl(aq)\) are double - replacement reactions.
-
when you think of the term double replacement, what do you imagine migh…
Two different things change places with each other.
-
phenol is a translucent, white crystalline solid that has a variety of …
\(AB + C ightarrow AC + B\)
-
from your work on the previous screen, you saw that single - replacemen…
- \(2Al(s)+Fe_{2}O_{3}(s)\to Al_{2}O_{3}(s)+2Fe(l)\) - \(2Al(s)+3CuO(s)\to 3Cu(s)+Al_{2}O_{3}(s)\)
-
single-replacement reactions what does the word single replacement mean…
One thing replaces another thing.
-
bufotenin is a toxin isolated from the skin of toads, particularly the …
A. \(AB + O_2 ightarrow AO_x+BO_y\)
-
what does the word combustion mean to you in the context of everyday li…
It refers to something burning.
-
dimethylmercury is one of the most potent neurotoxins known. this mercu…
C. \(A + B\to AB\)
-
detecting combination reactions from your work on the previous screen, …
\(Fe(s)+S(s)\to FeS(s)\), \(MgO(s)+CO_{2}(g)\to MgCO_{3}(s)\), \(CaO(s)+H_{2}O(l)\to Ca(OH)_{2}(aq)\)
-
take a close look at the combination reactions (also called synthesis r…
Two or more reactants have combined to form a more complex product, a new compound.
-
combination reactions when you think of the term combination, what come…
Two or more things come together to make a single larger thing.
-
as it does when used in airbags. symptoms of sodium azide poisoning inc…
B. \(AB - A + B\)
-
from your work on the previous screen, you saw that decomposition react…
- \(Na_2CO_3(s)+\text{heat}\to Na_2O(s)+CO_2(g)\) - \(2HgO(s)+\text{heat}\to2Hg(l)+O_2(g)\) - \(2NI_3(s)\to N_2(g)+3I_2(g)+\text{heat}\)
-
2h₂o₂(l)→2h₂o(l)+o₂(g)+heat ammonium sulfate: 3(nh₄)₂so₄(s)+heat→6h₂o(g…
A single starting compound breaks down into other compounds.
-
different types. youre going to learn about the many kinds of reactions…
1. Double replacement 2. Combustion 3. Decomposition 4. Single replacement 5. Combination
-
fecl₃ + naoh → fe(oh)₃ + nacl the double - replacement reaction shown a…
\(1FeCl_3 + 3NaOH = 1Fe(OH)_3+3NaCl\)
-
lets see if you can balance an equation with imaginary elements. it see…
\(1CD_3+3J_2P ightarrow1J_3CP_3 + 3JD\)
-
ok, now that you know what a balanced chemical equation looks like and …
\(1Sc_2O_3+3H_2O ightarrow2Sc(OH)_3\)
-
when balancing this equation like the one above, you may wonder where t…
\(2KNO_3+4Al + 1S ightarrow1K_2S+1N_2 + 2Al_2O_3\)
-
a chemist adds 240.0 ml of a $7.04\times10^{-5}$ mm zinc oxalate ($\tex…
\(2.59\space\mu g\)
-
calculate the volume in liters of a 0.00720 mmol/l calcium sulfate solu…
\(1.53\times 10^{5}\space L\)
-
a chemist prepares a solution of zinc nitrate (zn(no₃)₂) by measuring o…
\(2.71\space mol/L\)
-
a chemist prepares a solution of aluminum sulfate $(al_{2}(so_{4})_{3})…
\(0.35\space mol/L\)
-
a chemist prepares a solution of magnesium fluoride (mgf₂) by measuring…
\(1.2\times 10^{-3}\space mol/L\)
-
consider a hypothetical chemical reaction: ( a + b ightarrow c + d ) (i…
- What is the heat of reaction? \(-200\space kJ/mol\) - Is the reaction exothermic or endothermic? Exothermic - Can you determine the activation energy? Yes, it's \(150\space kJ/m…
-
reactant is needed to form the most amount of product possible. mole ra…
The number of moles of \(H_{2}O\) is \(0.35\space mol\) and the number of moles of \(O_{2}\) is \(0.175\space mol\)
-
what you may notice in all of these reactions is that the relative numb…
For the first reaction: \(300000\) \(H_2\) molecules and \(300000\) \(H_2O\) molecules. For the second reaction: \(3\) \(O_2\) moles and \(6\) \(H_2O\) moles.
-
consider a hypothetical chemical reaction: $a + b \\to c + d$ (in this …
- What is the heat of reaction? \(-100\ \text{kJ/mol}\) - Is the reaction exothermic or endothermic? Exothermic - Can you determine the activation energy? Yes, it's \(200\ \text{k…
-
nice work. now that chemical reaction-the combustion of hydrogen gas-is…
\(1O_2+2H_2 ightarrow2H_2O\)
-
sort it out sort the mixtures: solutions, suspensions, and colloidal di…
- **Solutions**: hand sanitizer, sugar in tea, saltwater, rubbing alcohol, perfume, air - **Suspensions**: orange juice with pulp, italian salad dressing, muddy water, sand in wat…
-
select all that apply which substances exist in high concentrations in …
magnesium, calcium
-
fill in the blank question in the first reaction involved in dissolving…
carbonic acid
-
fill in the blank question carbonic acid forms when gas dissolves in an…
Carbonic acid forms when carbon dioxide gas dissolves in water and combines with water molecules.
-
does your initial reaction still seem accurate? select all that apply. …
No, because the equation defies the law of conservation of mass. No, because the number of oxygen atoms on the reactants side is not the same as on the products side.
-
lets take a closer look at what you put togetheaccording to your equati…
Reactants: Red (oxygen) \(= 2\), Gray (hydrogen) \(= 2\) Products: Red (oxygen) \(= 1\), Gray (hydrogen) \(= 2\)
-
lets say a colleague working in the lab needs to create a solution cont…
\(0.46\)
-
how many liters of water would you need to add to 4.36 moles of nacl to…
$0.524$ liters
-
how many moles of nacl are in 2.35 liters of a 3.27e+0 m solution?
$7.68$ moles (rounded to three significant figures)
-
rank the following solutions from increasing to decreasing molarity. hi…
Highest concentration: A solution containing 3 moles of \(BaCl_2\) in 100 mL water (\(30\space M\)) Middle: A solution containing 60 grams of \(NaCl\) in 250 milliliters of water …
-
calculate the molar concentration a solution containing 9.73e+2 grams o…
\(65.93\)
-
a common unit to measure concentration is molarity (m). to calculate th…
\(1.41\) liters
-
calculate the molar concentration a solution containing 3.0 moles of na…
\(2.1\)
-
calculate the molar concentration a solution containing 3.0 moles of na…
\(2.14\space molar\) (rounded to two decimal places)
-
to determine the concentration of a solution, you need to know how many…
$1.346$
-
using the appropriate bond energies, calculate the heat of reaction \\(…
\(-689\ \text{kJ/mol}\)
-
calculate the molar concentration a solution containing 7.868e+1 grams …
\(1.58\space mol/L\)
-
calculate the molar concentration of 1.00e+0 moles of nacl in 0.50 lite…
$2.0$
-
pre - lab 7 question 4 4.75 points which combination of path length and…
A. large path length and large concentration
-
pre - lab 7 question 3 4.75 points using a cuvette with a path length o…
D. \(2.50\ M^{-1}\cdot cm^{-1}\)
-
pre - lab 7 question 2 4.75 points which situation would a serial dilut…
A. the dilution involves a very large change in concentration
-
pre - lab 7 question 1 4.75 points a student uses a 1.00 m stock soluti…
B. simple dilution
-
alisha organizes her data about the element lead into a table.which did…
Solid at room temperature
-
in the periodic table below, shade all the elements for which the neutr…
Shade the elements in Group 13 (B, Al, Ga, In, Tl), Group 14 (C, Si, Ge, Sn, Pb), Group 15 (N, P, As, Sb, Bi), Group 16 (O, S, Se, Te, Po), Group 17 (F, Cl, Br, I, At).
-
balance the equation s₈ + o₂ → so₃
The balanced equation is \(S_8+12O_2 = 8SO_3\), so the coefficients are \(1\) (for \(S_8\), already given as \(1\) implicitly in the problem's initial setup), \(12\) (for \(O_2\))…
-
for each atom in the table below, write down the subshell from which an…
| atom | subshell from which electron removed to form +1 cation | subshell to which electron added to form -1 anion | |---|---|---| | Xe | \(5p\) | \(6s\) | | Fe | \(4s\) | \(4p\)…
-
draw the electron configuration for a neutral atom of cobalt.
The electron configuration of a neutral cobalt atom is \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{7}\)