Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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question 13 not yet answered marked out of 1.00 flag question is trix c…
Question 13: b. Heterogeneous mixture. Question 14: a. Element. Question 15: a. Physical
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question 7 fill in the blank. in the gas state, a substance will have a…
1. d. Indefinite 2. c. Bonded 3. b. Heterogeneous mixture.
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quiz navigation question 1 not yet answered marked out of 1.00 flag que…
1. b. Chemical 2. a. Freezing 3. d. Liquid
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11. consider the following combination reaction: sodium metal reacts wi…
$\boldsymbol{2\text{Na} + \text{Cl}_2 ightarrow 2\text{NaCl}}$ $\boldsymbol{\text{Cl}_2 + 2\text{Na} ightarrow 2\text{NaCl}}$
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2. steel wool is composed of iron. steel wool reacts with oxygen in the…
Fe, $\text{O}_2$ (To complete the selection, check the box for $\text{O}_2$ along with the already checked $\text{Fe}$)
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2. use experimental data to determine the relative mass of two objects.
To solve the problem of determining the relative mass of two objects using experimental data, we can follow these steps: ### Step 1: Choose an appropriate experimental method One …
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7. make up your own model that shows conservation of mass:
In the final empty box, draw the 4 original triangular shapes plus the square with the number 5 inside. The total mass of the left side is $4m + 5m = 9m$, and the right side will …
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6. make a model to show that mass is conserved. what is the mass?, what…
Red Bricks: 3 Blue Bricks: 2 What might the product look like? A single connected structure made by joining all 3 red 2g bricks and 2 blue 3g bricks together (e.g., a long chain o…
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5. iron + chlorine longrightarrow iron chloride how many of each atom a…
Reactants: Fe: 2 Cl: 6 Products: Fe: 2 Cl: 6
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what happens when we combine hydrogen and oxygen to form water molecule…
1. **Chemical Reaction & Equation**: Hydrogen and oxygen undergo a synthesis (combustion) reaction to form water, following the balanced equation: $$2\text{H}_2 + \text{O}_2 ighta…
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write the formula for how a chemical reaction happens.
General formula for a chemical reaction: $$\text{Reactants} \xrightarrow{\text{Conditions}} \text{Products}$$ For a balanced example (e.g., combustion of hydrogen): $$2\text{H}_2 …
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c₂h₄o₂ + nacho₃ ⟶ co₂ + nac₂h₃o₂ + h₂o vinegar baking soda carbon dioxi…
| Products | Reactants | |----------|-----------| | 1 Total Na atoms | 1 Total Na atoms | | 5 Total O atoms | 5 Total O atoms | | 3 Total C atoms | 3 Total C atoms | | 5 Total H a…
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the chemical equation shown below is a model that helps us see the rear…
## Filled Table: | Products | Reactants | |------------------------|------------------------| | 1 Total Na atoms | 1 Total Na atoms | | 5 Total O atoms | 5 Total O atoms | | 3 Tot…
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2 of 10 next ▶ listed in the item bank are some important labels for se…
To solve this problem, we analyze the phase - change graph and match the labels: ### 1. Temperature Axis The vertical axis with values like \(0^{\circ}\text{C}\) and \(100^{\circ}…
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question 2 (0.83 points) mass wasting over time moves earthly materials…
Question 2: Tectonic uplift Question 3: The shear strength is weaker than the shear force
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name date ionic vs covalent bonds worksheet fill the table with the app…
| Compounds | Type of Bond | |-----------|--------------| | $\text{BaO}$ | Ionic | | $\text{Na}_2\text{O}$ | Ionic | | $\text{NI}_3$ | Covalent | | $\text{CBr}_4$ | Covalent | | $…
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draw the curved arrows and the resulting resonance structure for the fo…
### Curved Arrow Mechanism: 1. A curved arrow starts from the π bond of the C=C double bond and points towards the oxygen atom. ### Resulting Resonance Structure: A six-membered r…
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minerals with the same chemical composition, but different crystalline …
1. polymorphs 2. Kyanite
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practice: lewis structures for part 1, draw the lewis structures (also …
| Part 1 (Lewis Structure) | Part 2 (Bonding Prediction) | |---|---| | 1. $\text{Mg} \cdot \cdot$ | Lose 2 electrons to form ionic bonds | | 2. $\text{K} \cdot$ | Lose 1 electron …
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n these partial pressures: 3.5 atm n2, 2.8 atm o2, 0.25 $p_t = p_1 + p_…
Mole fraction of $\text{O}_2$: $\approx 0.43$ Mole fraction of $\text{Ar}$: $\approx 0.038$
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four gases were combined in a gas cylinder with these partial pressures…
6.7 atm
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a mixture of h₂ and water vapor is present in a closed vessel at 20.00°…
737.5 mmHg
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ionic bonding name ionic bonding occurs when a metal transfers one or m…
1. $\text{K}^{\cdot} + \cdot\ddot{\text{F}}: ightarrow \text{K}^+:\ddot{\text{F}}^-$ (KF) 2. $\cdot\text{Mg}\cdot + 2\cdot\ddot{\text{I}}: ightarrow \text{Mg}^{2+}2:\ddot{\text{I}…
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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 …
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5. an unknown compound consists of 2 moles of oxygen, 4 moles of hydrog…
a. $\text{C}_3\text{H}_4\text{O}_2$
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6. a compound contains 10.0% a, 48.0% b, and 42.0% c. use 1.00 g/mol fo…
a. $A_5B_2C$
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2. compound a has 4 moles of iodine, 2 moles of oxygen, and 8 moles of …
d. $\text{I}_2\text{OCl}_4$
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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…
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using the thermodynamic information in the aleks data tab, calculate th…
-16 (assuming the calculation with standard values rounds to -16, but actual value depends on ALEKS data; if using the typical values, the answer is -16 J/K)
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using the thermodynamic information in the aleks data tab, calculate th…
$\boldsymbol{88}$
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29 find the molecular formula of ethylene glycol, which is used in anti…
29. $\text{C}_2\text{H}_6\text{O}_2$ 30. $\text{C}_2\text{ClN}$
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27 calculate the empirical formula for a compound that contains 67.6% h…
$\text{HgSO}_4$
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name:_______ period_______ date_______ | | compound formula | element n…
21. True 22. True 23. True
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name:___________________________ period___________ date___________ | | …
1. Completed compound table and true/false evaluations as shown above 2. True/False Answers: 21. True 22. True 23. True
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2) _2_ cu + _1_ o₂ → _2_ cuo 2a if 101 grams of copper is used, how man…
Approximately 1.59 moles ### 2b
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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
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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…
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2. in thermodynamics, “spontaneous” means that a reaction will occur: (…
(d) without an input of energy.
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1. if the $\\delta g^{\\circ\\prime}$ of the reaction $s \ ightarrow p$…
(b) proceed spontaneously from left to right.
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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.
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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…
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3. after an object of with a mass of 40.211 g is placed in a graduated …
$46.45\ \text{mL}$
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part 1: multiple choice questions 1. what does vsepr stand for? a. vale…
A. Valence Shell Electron Pair Repulsion #### Question 2
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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…
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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. $4.87\ \text{mL}$
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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…
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3 the table shows the amount of nahco₃ a chemist dissolves in water to …
D 1.75
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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 …
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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…
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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…
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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…
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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…
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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 …
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25. if a solution has a hydrogen ion concentration of 1 × 10⁻⁴ m, what …
c. 4
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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
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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…
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5. which ion combination forms a soluble compound with sulfate (so₄²⁻)?…
a. $\text{Na}^+$ (sodium)
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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
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5. damian mixed two samples together: a red liquid that smells irritati…
b. Diagram B
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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.
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3. tiana is a chemist who is making a chemical to add to swimming pools…
c. Diagram C
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2. serena mixed two samples together: a gray solid that smells like flo…
b. Diagram B
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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.
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attempt 1 in progress next up: submit assignment available until mar 20…
B. The gas is compressed.
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6. a flask has a mass of 78.23 g when empty and 593.63 g when filled wi…
$1.84\ \text{g/cm}^3$
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convert 40°f to degrees celsius. if necessary, round your answer to the…
\( 4.4^{\circ}\text{C} \)
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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…
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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…
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part 5: identify the separation method 1. separating sand from water: 2…
Filtration ### 2. Separating salt from saltwater
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part 4: temperature & solubility when sugar is added to cold water, onl…
Hot water ### Question 2
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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 \( \text{Hg}_2^{2+} \)),…
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3. which method would best separate iron filings from sand? a. filtrati…
D. Magnetism ### Question 4
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part 2: multiple choice circle the correct answer. 1. which is an examp…
C. Sand and water ### Question 2
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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
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write the names of the following covalent compounds: 21) so₃ 22) n₂s 23…
21) sulfur trioxide 22) dinitrogen sulfide 23) phosphine 24) boron trifluoride
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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…
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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.
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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…
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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
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select the correct answer from each drop - down menu. what causes atoms…
each atom and the shared electrons
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which of the following compounds would be most likely to decompose into…
$\boldsymbol{\text{HBr}(g)}$ (with $\Delta G_f^\circ = -53.4\ \text{kJ/mol}$)
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calculate the change in entropy of liquid bromine using the data below.…
+152
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which of the solutions below is a strong acid? a) hcn b) hno₂ c) hf d) …
d) $\ce{H2SO4}$
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how can we calculate the equilibrium concentration of $\\ce{h3o+}$ of a…
c) Use the ICE chart
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what is the brønsted-lowry definition of base? a) contains oh⁻ b) elect…
c) Proton acceptor
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what is the ph of a 0.15 m nh₄oh solution with a kᵦ of 1.78 x 10⁻⁵? a) …
b) 11.21
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what is the ph of the 0.00125 m naoh solution? remember that naoh is a …
d) $\text{pH} = 14 - \text{pOH} = 14 - 2.9 = 11.1$
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what is the ph of a 0.00125 m hcl solution? remember that hydrochloric …
d) pH = -log[H₃O⁺]= 2.9
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what is the formula to calculate ph? a) $\\ce{ph = logh_2o}$ b) $\\ce{p…
c) $\text{pH} = -\log[\text{H}_3\text{O}^+]$
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lets begin with some experiments! what do you think will happen, if we …
b) The strong acid will completely dissociate into $[H^+]$ and $[A^-]$
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which hazard sign is warning you of the potential corrosiveness of stro…
a) Sign A
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select the correct answer. which quantity is a graduated cylinder desig…
E. volume
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3 multiple choice 1 point when you burn a log in your fireplace, you ar…
B. chemical to thermal energy
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2 multiple choice 1 point river water stored behind a dam is best descr…
E. potential energy
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select the correct answer. bromine (br) belongs to the halogen family. …
D. 7
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select the correct answer from each drop - down menu. mendeleev’s table…
For the first part (why Mendeleev’s table was better accepted): it could accommodate new elements. For the arrangement (elements arranged according to): atomic mass (note: if the …
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select the correct answer. which statement best describes how a compoun…
A. A compound contains two or more elements in a fixed proportion.
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drag each tile to the correct location. classify each property as inten…
- Intensive Property: reactivity with acid - Extensive Property: volume, length
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select the correct answer. a chemist divides a large sample of a mixtur…
C. heterogeneous mixture
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there are four squares with x and dots, and blue labels on the right: f…
To solve this problem, we analyze the pattern of dots around the "X" in each square and match it to the number of valence electrons of the elements (fluorine, sodium, phosphorus, …