化学
化学反应、化学计量、分子结构与元素性质。
-
practice: electron configurations part 1: write out the electron config…
## Part 1: 1. Be: $1s^2 2s^2$ 2. F: $1s^2 2s^2 2p^5$ 3. P: $1s^2 2s^2 2p^6 3s^2 3p^3$ 4. Cu: $1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^1$ 5. Hg: $1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^2 …
-
5. an unknown compound consists of 2 moles of oxygen, 4 moles of hydrog…
a. $\text{C}_3\text{H}_4\text{O}_2$
-
6. a compound contains 10.0% a, 48.0% b, and 42.0% c. use 1.00 g/mol fo…
a. $A_5B_2C$
-
2. compound a has 4 moles of iodine, 2 moles of oxygen, and 8 moles of …
d. $\text{I}_2\text{OCl}_4$
-
each case, he fills a reaction vessel with some mixture of the reactant…
s: - First reaction $\Delta G$: $\boldsymbol{-32\ \text{kJ}}$, Spontaneous: $\boldsymbol{\text{this reaction}}$ - Second reaction $\Delta S$: $\boldsymbol{214\ \frac{\text{J}}{\te…
-
each case, he fills a reaction vessel with some mixture of the reactant…
### First Reaction: \( \boldsymbol{\mathrm{C_6H_{12}O_6}(s) ightarrow 6\mathrm{C}(s) + 6\mathrm{H_2}(g) + 3\mathrm{O_2}(g)} \) #### Step 1: Convert temperature to Kelvin The tempe…
-
using the thermodynamic information in the aleks data tab, calculate th…
$\boldsymbol{88}$
-
29 find the molecular formula of ethylene glycol, which is used in anti…
29. $\text{C}_2\text{H}_6\text{O}_2$ 30. $\text{C}_2\text{ClN}$
-
27 calculate the empirical formula for a compound that contains 67.6% h…
$\text{HgSO}_4$
-
name:_______ period_______ date_______ | | compound formula | element n…
21. True 22. True 23. True
-
name:___________________________ period___________ date___________ | | …
1. Completed compound table and true/false evaluations as shown above 2. True/False Answers: 21. True 22. True 23. True
-
2) _2_ cu + _1_ o₂ → _2_ cuo 2a if 101 grams of copper is used, how man…
Approximately 1.59 moles ### 2b
-
3) _8_ mg + _2_ hcl → _2_ mgcl₂ + _1_ h₂\ 3a what mass of hcl is consum…
182.25 g (or considering significant figures, 180 g or 182 g depending on precision) ### 3b
-
3. what types of r groups would compete with salt ions for water of sol…
Polar and charged R groups (such as hydroxyl (-OH), carboxyl (-COOH), amino (-NH₂), and charged ionic R groups like -COO⁻ or -NH₃⁺) would compete with salt ions for water of solva…
-
2. in thermodynamics, “spontaneous” means that a reaction will occur: (…
(d) without an input of energy.
-
1. if the $\\delta g^{\\circ\\prime}$ of the reaction $s \ ightarrow p$…
(b) proceed spontaneously from left to right.
-
look at this dictionary entry. brainchild \\breyn-chahyld\\ noun 1. a p…
Although Alexander Graham Bell obtained the first patent for a telephone, the device was originally the brainchild of Antonio Meucci.
-
show work for the following problems!!! 6. the mass and percent abundan…
1. Element X isotope masses: 16, 17, 18; Average atomic mass: $\approx 16.03$ 2. Element Y isotope masses: 35, 37; Average atomic mass: $\approx 35.48$ 3. Element Z isotope masses…
-
3. after an object of with a mass of 40.211 g is placed in a graduated …
$46.45\ \text{mL}$
-
part 1: multiple choice questions 1. what does vsepr stand for? a. vale…
A. Valence Shell Electron Pair Repulsion #### Question 2
-
1. fill in the blanks on the diagrams below. 2. explain how to find the…
1. Left diagram: Atomic Number = $11$ Atomic Mass = $22.98977$ Right diagram: Top left blank: $11$ Top right blank: $22.98977$ 2. Atomic mass is the weighted average of the masses…
-
example: 2. 6.450m × 3.400m × 2.1m = 46.053 m³ 2.1 has the fewest sf (t…
3. $3.14\ \text{mL}$ 4. $0.006\ \text{mL}^3$ 5. $40.00\ \text{g}$ 6. $319.0\ \text{g}^2$ 7. $697.7$ 8. $4.87\ \text{mL}$
-
element symbol | element name | electron configuration | # of valence e…
| Element Symbol | Element Name | Electron Configuration | # of Valence electrons | Will prefer to: a. gain electrons b. lose electrons c. neither | # of electrons to needed to ga…
-
3 the table shows the amount of nahco₃ a chemist dissolves in water to …
D 1.75
-
making a connection: 5. when a sodium atom bonds with a chlorine atom s…
Sodium loses 1 electron instead of gaining 7 because this requires much less energy to achieve a stable full valence electron shell (matching the noble gas electron configuration …
-
atoms, ions, & isotopes 1. fill in the blanks on the diagrams below. 2.…
1. Left diagram: Atomic Number = $11$ Atomic Mass = $22.98977$ Right diagram: Top left blank: $11$ Top right blank: $22.98977$ 2. Atomic mass is the weighted average of the masses…
-
draw the curved arrows and the resulting resonance structure for the fo…
(The curved arrow is drawn from the double - bond electrons towards the positively charged carbon. The resulting resonance structure has the double bond shifted in the cyclohexane…
-
directions: use the diagram to fill in the box completely. fill in the …
A: Solid B: Liquid (given) C: Gas D: Melting E: Evaporation F: Condensation G: Freezing H: (Assuming H is a typo or related, but based on diagram, H might be a phase change, but w…
-
modify the second structure given to draw the new resonance structure. …
The resonance structure is drawn by: - Converting the double bond between the carbon adjacent to \(CH_2^+\) and \(CH_2^+\) to a single bond. - Converting the single bond between t…
-
draw a resonance structure for the compound below.
The resonance structure can be drawn as follows: The cyclohexane ring with a carbon atom (adjacent to the \( \text{C}-\text{N} \) bond) having a \( + \) charge, the nitrogen atom …
-
25. if a solution has a hydrogen ion concentration of 1 × 10⁻⁴ m, what …
c. 4
-
22. if a solution has a mass percent of 15%, what does this mean? a. 15…
d. 15% of the solution's mass is solute
-
learning intentions - i can balance complex chemical equations with mul…
Balanced Equation: $\boldsymbol{\ce{2Al + 3Br_{2} ightarrow 2AlBr_{3}}}$ Reaction Type: Synthesis Justification: Two reactants (Al and $\ce{Br_{2}}$) combine to form a single prod…
-
5. which ion combination forms a soluble compound with sulfate (so₄²⁻)?…
a. $\text{Na}^+$ (sodium)
-
1. what does the dilution formula $c_1v_1 = c_2v_2$ ensure? a. the amou…
a. The amount of solute remains constant before and after dilution
-
5. damian mixed two samples together: a red liquid that smells irritati…
b. Diagram B
-
4. the diagram above shows the repeating groups of atoms that make up t…
A. The properties will likely be different because the repeating groups of atoms that make up each sample are different.
-
3. tiana is a chemist who is making a chemical to add to swimming pools…
c. Diagram C
-
2. serena mixed two samples together: a gray solid that smells like flo…
b. Diagram B
-
1. the diagram above shows the repeating groups of atoms that make up t…
a. The properties will likely be different because the repeating groups of atoms that make up each sample are different.
-
attempt 1 in progress next up: submit assignment available until mar 20…
B. The gas is compressed.
-
6. a flask has a mass of 78.23 g when empty and 593.63 g when filled wi…
$1.84\ \text{g/cm}^3$
-
convert 40°f to degrees celsius. if necessary, round your answer to the…
\( 4.4^{\circ}\text{C} \)
-
what should you add to your ecocolumn if you want to test the effects o…
B. inorganic fertilizer (assuming the options are labeled as A. Styrofoam, B. inorganic fertilizer, C. oxygen, D. carbon monoxide; if labels differ, adjust accordingly but the cor…
-
part 3: short answer answer in complete sentences. 1. explain the diffe…
A mixture is a combination of two or more substances where each retains its properties and can be physically separated (e.g., sand - water mixture), while a solution is a homogene…
-
part 5: identify the separation method 1. separating sand from water: 2…
Filtration ### 2. Separating salt from saltwater
-
part 4: temperature & solubility when sugar is added to cold water, onl…
Hot water ### Question 2
-
passport #9: naming binary ionic compounds write the ionic charges for …
The ionic charges for the multivalent metals are filled in the table as shown above. For example: - Fe: \( +2, +3 \) - Cu: \( +1, +2 \) - Hg: \( +1 \) (as \( \text{Hg}_2^{2+} \)),…
-
3. which method would best separate iron filings from sand? a. filtrati…
D. Magnetism ### Question 4
-
part 2: multiple choice circle the correct answer. 1. which is an examp…
C. Sand and water ### Question 2
-
part 1: vocabulary review match each term to the correct definition. 1.…
1. F 2. D 3. A 4. E 5. B 6. J 7. G 8. I 9. H 10. K 11. C
-
write the names of the following covalent compounds: 21) so₃ 22) n₂s 23…
21) sulfur trioxide 22) dinitrogen sulfide 23) phosphine 24) boron trifluoride
-
for silicon (14, silicon, 28.086): atomic # = 14 mass number = ____ # o…
### Top Right (Oxygen): # of Protons = 8 # of Neutrons = 8 # of Electrons = 8 ### Middle Right (Zinc): # of Protons = 30 # of Neutrons = 35 # of Electrons = 30 ### Bottom Right (L…
-
from “the house on the hill” by edwin arlington robinson 10 why is it t…
1. B. the regular rhyme scheme 2. D. The stanza break indicates a pause in the speaker's thoughts that reflects his sadness.
-
iodine + oxygen magnesium + nitrogen aluminum + chlorine iron + oxygen …
1. The first ELECTRON SHELL can hold up to $\boldsymbol{2}$ electrons. 2. Helium has $\boldsymbol{2}$ valence electrons. 3. Fluorine + Oxygen: $\boldsymbol{\text{OF}_2}$ (Oxygen d…
-
mass number equals the number of __________ + __________ 30 zich zinc 6…
Top blanks (left to right): Protons, Neutrons Zinc: Mass number = 65 Lithium: Mass number = 7
-
question: seawater contains salt, a/an ____ molecule that consists of a…
ionic
-
9 multiple choice 1 point what term is used to describe a substance tha…
9. A desiccant 10. Pentane
-
5.an even greater benefit has been observed in swimming. in denmark, th…
D. People can have social interactions while engaged in individual sports, whether they are swimming or skating.
-
for problems 7 - 10, solve the system of equations using elimination. 7…
7. $x=2$, $y=0.5$ 8. $x=3$, $y=-3$ 9. $x=14$, $y=11$ 10. $x=1.25$, $y=3.75$ 11. Pure water: 16 L, Salt water: 64 L 12. $\begin{cases} 5x + 2y = 34 \\ 2x - 1y = 1 \end{cases}$ (oth…
-
click to fix any plural or possessive errors below. if there is no erro…
Patrick Star met a group of chemists and asked to try on their goggles.
-
a chemical engineer must calculate the maximum safe operating temperatu…
\( 396^\circ \text{C} \)
-
sometimes in lab we collect the gas formed by a chemical reaction over …
\( \approx 0.16 \, \text{g} \) (or \( 0.14 \, \text{g} \) if accounting for water vapor, but typical assumption for simplicity gives ~0.16 g)
-
which of the following compounds would be most likely to decompose into…
$\boldsymbol{\text{HBr}(g)}$ (with $\Delta G_f^\circ = -53.4\ \text{kJ/mol}$)
-
calculate the change in entropy of liquid bromine using the data below.…
+152
-
show what you know in the boxes below, sketch out how each type of reac…
### Endothermic Graph: - Left dashed line: Reactants (lower energy) - Right dashed line: Products (higher energy) - Reaction line: Curved line starting at reactants, rising to a s…
-
science 10 name: practice drawing the following compounds mgo naf lif l…
1. **NaF**: - Sodium ion (Na⁺): Nucleus with 11p, 11n; 2 electron shells with 2 and 8 electrons, labeled +1. - Fluoride ion (F⁻): Nucleus with 9p, 10n; 2 electron shells with 2 an…
-
the mole and avogadros number name one mole of a substance contains avo…
The number of molecules in 15 moles is $9.03\times10^{24}$ ### For question 5 (0.35 mole):
-
13. base your answer(s) to the following question(s) on the information…
1. Reacción de descomposición (térmica) 2. Reacción de síntesis (o reacción de combinación; también es una reacción de oxidación-reducción, pero el tipo principal por la estructur…
-
8. given the balanced equation representing a reaction: zn(s) + h₂so₄(a…
8. C. single replacement 9. A. single replacement and decomposition 10. A. synthesis 11. A. single replacement 12. C. $H_2SO_4 + Mg ightarrow H_2 + MgSO_4$ 13. Decomposition react…
-
a. single replacement and decomposition b. single replacement and doubl…
- Pregunta (In which type of chemical reaction...): A. synthesis - Pregunta 13: Decomposition reaction (descomposición) - Pregunta 14: Synthesis reaction (síntesis)
-
4. 1. given the balanced equation: agno₃(ad) + nacl(ad) → nano₃(ad) + a…
1. D. double replacement 2. B. decomposition
-
balancing equations - problems instructions: balance the chemical equat…
1. $1\text{CH}_2\text{O} + 1\text{H}_2 ightarrow 1\text{CH}_3\text{OH}$ 2. $2\text{NH}_3 ightarrow 1\text{N}_2 + 3\text{H}_2$ 3. $1\text{C}_2\text{H}_6 ightarrow 1\text{C}_2\text{…
-
1. given the balanced equation: \\(\\ce{agno_{3}(aq) + nacl(aq) \ ighta…
1. D. double replacement 2. B. decomposition 3. C. decomposition, double replacement, and synthesis 4. D. synthesis 5. A. $\text{CaCO}_3(\text{s}) ightarrow \text{CaO}(\text{s}) +…
-
4. 15 moles 5. 0.35 mole how many moles are in the number of molecules …
To solve for the number of moles from the number of molecules, we use the formula: $\text{Moles} = \frac{\text{Number of Molecules}}{6.02 \times 10^{23}\ \text{molecules/mol}}$ (A…
-
0 ch₂o + 0 h₂ → 0 ch₃oh
$\boldsymbol{1\ \text{CH}_2\text{O} + 1\ \text{H}_2 ightarrow 1\ \text{CH}_3\text{OH}}$
-
question #12 fertilizer runoff containing nitrogen and phosphorous flow…
C. The populations of fish in the lake will decrease.
-
at the bottom of the page, choose the separate water option. 9) in the …
1. Product 2. Reactant 3. 2, 2, 1 (for $\text{H}_2\text{O}$, $\text{H}_2$, $\text{O}_2$ respectively) 4. (Left box: 2 molecules of $\text{H}_2\text{O}$ (each with 1 O and 2 H atom…
-
1pt nico combines lemon juice, ice, and sugar. what is the result? drag…
First blank: sugar Second blank: lemon juice Third blank: solution
-
balancing equations - phet simulator instructions: open the balancing c…
1. **For reactant/product identification**: - $\text{N}_2$: Reactant - $\text{H}_2$: Reactant - $\text{NH}_3$: Product 2. Balanced coefficients: $\boldsymbol{1}$ $\text{N}_2 + \bo…
-
sugar and salt are solids, but when they are mixed thoroughly into wate…
B. The water causes the salt and sugar to dissolve and form a solution.
-
a student adds 35 grams of sand to a container that holds 100 grams of …
A. When the water is weighed again, it will weigh 85 grams. D. If the water and wet sand are weighed together, the total weight will be 150 grams.
-
a student is conducting an investigation to compare the weight of objec…
C. 120 grams
-
4. in it seems like matter is lost during a chemical reaction? a. b. ma…
4. C. some matter becomes a gas and spreads into the air 5. D. Matter is not created or destroyed during reactions
-
1. wh... chemical reaction? * a. when a substance melts b. when two or …
1. B. When two or more substances form a new substance 2. C. Bubbles forming when baking soda and vinegar are mixed 3. C. It stays the same 4. It may seem like matter is lost if a…
-
if 7.51 moles co₂ are emitted, how many grams of octane fuel (c₈h₁₈) do…
107 grams of octane fuel ($\text{C}_8\text{H}_{18}$) need to be burned.
-
part ii: give me five directions: give two facts and three examples for…
## Chemical reaction 1. Fact: Rearranges atomic bonds 2. Fact: Produces new substances 3. Example: Rusting of iron ($4\text{Fe} + 3\text{O}_2 ightarrow 2\text{Fe}_2\text{O}_3$) 4.…
-
$$i_2 (g) + cl_2 (g) \ ightarrow 2icl (l)$$ how many moles of iodine ar…
$4.39 \text{ mol } \text{I}_2$
-
what is the molar mass of li₂o?
The molar mass of $\ce{Li2O}$ is approximately $29.88\ g/mol$ (or can be rounded to $30.0\ g/mol$ depending on significant figures).
-
9. what mass of nacl is needed to prepare 125ml of a 2.5m solution? (re…
$18.28125\ \text{g}$ (or rounded to $18.3\ \text{g}$)
-
the substance in which something is dissolved to make a solution is cal…
c) A solvent
-
the substance that is dissolved in a mixture is called? a) a suspension…
d) A solute
-
3.) what is the chemical formula for iron (iii) oxide? (1 point) fe₂o₃ …
A. $Fe_2O_3$
-
2.) what is the chemcial formula for potassium sulfide? (1 point)\\(\\b…
A. \(K_2S\)
-
1.) what is the chemical formula with mg⁺² and cl⁻¹? (1 point) ○ mg₁cl₂…
D. \( \text{MgCl}_2 \)
-
goal: use your research from your questions to build a paragraph (jan 2…
Temperature directly impacts the rate and size of crystal growth. First, the solubility of most solids increases with temperature, so hot water can hold far more borax than cold w…
-
1.6: temperature conversion; pictographs, bar graphs, and circle score:…
$365$ °F
-
1.6: temperature conversion; pictographs, bar graphs, and circle graphs…
$-90$
-
illustrate a chart that displays 5 chemical and physical changes. you c…
| Physical Changes (No New Substance) | Chemical Changes (New Substance Formed) | |--------------------------------------|------------------------------------------| | 1. Melting …
-
now we need to prepare a buffer that has a ph of 7.4. we need this spec…
c) By mixing weak acid with its conjugate base and then adjusting the pH with strong base