化学
化学反応、化学量論、分子構造、元素の性質。
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15. use the equation you built in the previous problem. calculate how m…
0.03885 moles of $\text{Na}_2\text{O}$
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fireworks operators usually fall into one of two camps: those who striv…
- Some people like loud fireworks. - Stunning visual effects are possible with fireworks.
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14. construct the mole ratio needed to calculate how many moles of $na_…
Filled calculation: $0.0777\ \text{mol NaHCO}_3 \times \frac{1\ \text{mol Na}_2\text{O}}{2\ \text{mol NaHCO}_3} = 0.03885\ \text{mol Na}_2\text{O}$ Final moles of $\text{Na}_2\tex…
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13. next, you will consider possible reaction #3. balance the chemical …
The coefficients (in order) are 2, 1, 2, 1.
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12. here is the summary of the two solids remaining if reaction #2 occu…
### Solid Remaining: Na: 1.79 g C: 0.933 g ### Total mass of solid produced: 2.72 g
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11. recall that there are 0.0777 moles $\text{nahco}_3$ reacting. calcu…
0.0777 mol C
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10. recall that there are 0.0777 moles $\\text{nahco}_3$ reacting in th…
0.0777 mol
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a lizard egg needs a temperature of 26-30°c to hatch properly. you plac…
D. Calcium chloride because it will create an exothermic reaction.
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9. next, predict the mass of the solid that would remain if reaction #2…
The coefficients (from left to right) are 2, 2, 1, 2, 3. The solid products are $\text{Na}(s)$ and $\text{C}(s)$; their total molar mass per 2 moles of $\text{NaHCO}_3$ is $(2\tim…
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chemistry unit 3 – quiz 1 practice 13. (5 pts) calculate the percent ab…
Percent abundance of Lutetium-175: \(97.40\%\) Percent abundance of Lutetium-176: \(2.60\%\)
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8. you calculated that 0.0777 moles naoh will remain if reaction #1 occ…
$3.108\ \text{g}$
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7 a cook had a jar containing a sweet food and a jar containing a sour …
A. The sweet food changed because the molecules were able to move fast enough to overcome the attraction between them. Its molecules now move away from each other.
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6 scientists digging in a cave found an unknown substance. the scientis…
a. into the substance, and the substance changed into a gas.
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5. a scientist has a container with a substance inside. at first, the m…
b. Before, the substance was a gas. Later, it was a liquid.
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7. use the equation built in the previous problem. calculate how many m…
0.0777 moles
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3. divers found two substances at the bottom of the ocean. at room temp…
a. weaker attraction between its molecules than Substance 2. Its molecules now move in place.
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6. construct the mole ratio needed to calculate how many moles of naoh …
Filled conversion: $0.0777\ \text{mol NaHCO}_3 \times \frac{1\ \text{mol NaOH}}{1\ \text{mol NaHCO}_3} = 0.0777\ \text{mol NaOH}$ Final moles of NaOH: $0.0777$
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9. classify the following changes as physical or chemical. a. boiling b…
a. Boiling: Physical change b. Crumpling: Physical change c. Burning: Chemical change d. Freezing: Physical change e. Evaporating: Physical change f. Rotting: Chemical change g. R…
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5. you can now convert the student response moles $ce{nahco_{3}}$ to mo…
$\text{NaHCO}_3(s) ightarrow \text{NaOH}(s) + \text{CO}_2(g)$ The coefficients are: 1, 1, 1
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4. you measured the mass of the baking soda ($nahco_3$) to be 6.53 gram…
$0.0777$ moles (rounded to three significant figures)
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heres the dimensional analysis setup from the previous problem: $14.3 \…
7.15 moles of $\text{O}_2$
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1 multiple choice 2 points what is the answer, with the correct number …
109.30 g ---
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4. when two nonpolar molecules are compared, we should consider the num…
1. Question 4: Butane, $\text{C}_4\text{H}_{10}$ 2. Question 5: Butane has the greatest number of electrons of the three molecules, making it the most polarizable. More polarizabl…
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the truth about tobacco what is in tobacco? a single puff of cigarette …
### What Is In Tobacco? NICOTINE: **addictive stimulant** drug found in **tobacco** CARBON MONOXIDE: A **colorless, odorless**, poisonous **gas** produced when tobacco burns. TAR:…
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determining charge an element becomes a positively charged ion when it …
loses electrons.
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practice: 5. explain the difference between physical properties and che…
- **Physical Properties**: Characteristics observable without changing the substance's chemical composition. Examples: Density ($\frac{\text{mass}}{\text{volume}}$), color, meltin…
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which sentence contains a metaphor? ○ the track star ran the race as fa…
B. The basketball player was a giant next to the small boy.
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explain. 8. can two atoms of the same element ever have different atomi…
No, two atoms of the same element cannot have different atomic numbers. The atomic number is the number of protons in an atom's nucleus, and this number uniquely defines an elemen…
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an element with mass 640 grams decays by 7.3% per minute. how much of t…
360.4 grams
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the electro-magnetic connectionhow do electromagnets work?what do a wre…
1. A length of conductive (usually copper) wire, a piece of metal, and a source of electricity. 2. When current is introduced, it flows through the wire, creating a magnetic field…
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part: 1 / 2 part 2 of 2 what would happen to the molarity of the soluti…
The molarity of the solution in the flask would be lower than the calculated value.
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select the single best answer for each part. part: 0 / 2 part 1 of 2 af…
Use a funnel through which the solid is poured into the flask, then rinse the funnel to ensure all is added to the flask.
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select the single best answer for each part.part: 0 / 2part 1 of 2after…
Pour the solid from the weighing vessel directly into the flask, then rinse the weighing vessel to ensure all residual solid is added to the flask.
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part: 0 / 2 part 1 of 2 after measuring the mass of a solid in a weighi…
Pour the solid from the weighing vessel directly into the flask, then rinse the weighing vessel to ensure all residual solid is added to the flask.
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after measuring the mass of a solid in a weighing vessel, what are the …
○ Pour the solid from the weighing vessel directly into the flask, then rinse the weighing vessel to ensure all residual solid is added to the flask.
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use the diagrams below to answer questions 1- 3.propanemethanoic acid1.…
1. | Substance | Boiling Point | Intermolecular Attractive Force(s) | |-----------------|---------------|-------------------------------------| | Propane | 229 K | London dispersi…
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an oxygen atom picks up two additional, free-floating electrons. is the…
Negative
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which characteristic increases the rate of a solute dissolving in a sol…
D. stirring solutions
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four students in a class explained how the size of the solute or temper…
Sophia and Christian
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i am a noble gas. i can be found in the same period as the lightest of …
Argon (Ar)
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the amount and ability of substance that can be dissolved by another su…
Solubility
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having problems staying logged in or are you experiencing issues? pleas…
Sodium (Na)
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a physical law that states that matter is not created or destroyed duri…
Law of Conservation and Mass
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word:with prefix meaning \same\ used to describe solutionssiftingsolute…
homogeneous
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a method of separation that changes a liquid to a gas leaving behind di…
C. Evaporation
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3. 4 for each statement, write whether each describes a generic drug or…
### Question 3: 1. Generic 2. Brand-name 3. Brand-name 4. Both ### Question 4: You should not mix Tylenol with alcohol. Alcohol inhibits the liver's ability to metabolize acetamin…
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method used to sort liquids from non liquids usually done using a filte…
B. Filtration
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words used to tell how strong a solution is based on the amount of solu…
D. Concentration
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method of sorting object by buoyancy (ability to sink or float in water…
A. flotation
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chasity whitney chapter 8 summarize the situation with the wood and the…
### VOCABULARY - censure: To criticize harshly - conciliatory: Intended to make peace - machinations: Schemes, often sneaky ones - skulking: Hiding or moving secretly - unscathed:…
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a student combines water and salt in beaker a and combines sand and soi…
Beaker A contains a solution, and beaker B contains a mixture.
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a chef mixes oil and water in a bowl to make a salad dressing. what wil…
The oil and water will remain separate in the bowl and create a mixture.
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a teacher mixes salt and gravel in a bowl of water and stirs the mixtur…
The provided model is incorrect. A correct model would: 1. First show the removal of all gravel (diamond symbols) from the mixture of salt, water, and gravel. 2. Then show the rem…
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a student makes four mixtures and records his observations in a table. …
The salt is soluble in water.
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a teacher demonstrates an activity to show how different objects intera…
Sugar dissolves in water, and sawdust floats on water.
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lemonade is made by dissolving sugar and lemon juice in water. water is…
Lemonade is a mixture, and water is a compound.
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ntinued)organize the information on atomic mass to complete the outline…
## B. Atomic mass unit 1. Defined as $\frac{1}{12}$ mass of carbon-12 atom 2. Equals $1.6605 \times 10^{-24}$ grams 3. 1 proton/neutron ≈ 1 atomic mass unit ## C. Protons 1. Posit…
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ntinued)organize the information on atomic mass to complete the outline…
## B. Atomic mass unit 1. Defined as $\frac{1}{12}$ mass of carbon-12 atom 2. Equals $1.6605 \times 10^{-24}$ grams 3. 1 proton/neutron ≈ 1 atomic mass unit ## C. Protons 1. Posit…
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having problems staying logged in or are you experiencing issues? pleas…
Sodium (Na)
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use the activity series below to predict the products of each of the fo…
NaCl + Ag
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you may have noticed an (s) next to one of the products in some double …
1. $\text{CdS}$ 2. $\text{Fe(OH)}_3$ 3. $\text{BaCO}_3$
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a block has a mass of 23 grams and a volume of 10 cm³. using the table …
Glass
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reactions you may have noticed an (s) next to one of the products in so…
1. $\text{CdS}$ 2. $\text{Fe(OH)}_3$ 3. barium carbonate
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1. a plastic toy with a mass of 18 g occupies 9 cm3 of space. its densi…
1. 2.0 g/cm3 2. 22 cm3 3. Cannot be solved: Required reference table is not provided.
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predict the products of the double replacement reactions given. check t…
$\text{BaSO}_4 \text{(s)} + \text{MgCl}_2$ (corresponding to the fourth option)
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11. what is the correct procedure for students to follow if a chemical …
11. c) Stand back and advise the teacher of the spill. 12. d) things in an experiment that don't change 13. b) Quantitative
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reactions predict the products of the double replacement reactions give…
$\text{NaNO}_3 + \text{AgCl (s)}$
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try it reactions predict the products for the single replacement reacti…
$\text{ZnCl}_2 + \text{H}_2$
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liquids quiz complete 1 2 3 4 5 6 7 8 9 10 time re 56: glycerol boils a…
boils at a higher temperature than water, its intermolecular attractive forces must be stronger.
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liquids quiz complete 1 2 3 4 5 6 7 8 9 10 time remaini 56:31 which ter…
naturally mix without an agent, immiscible liquids do not mix on their own, and compressed molecules are unrelated to this mixing function.
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liquids quiz complete 1 2 3 4 5 6 7 8 9 10 what is produced on the top …
surface tension
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part 2: write out and balance: iron and oxygen react to form iron (iii)…
3. $160\ \text{g}$ (rounded to 2 significant figures) 4. $2.00\times10^{23}$ molecules
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liquids quiz complete 1 2 3 4 5 6 7 8 9 10 time remain 57:08 which proc…
boiling
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liquids quiz complete 1 2 3 4 5 6 7 8 9 10 time remaining 57:30 carla m…
way that causes forward motion, it does not significantly increase water molecule kinetic energy to move the boat, and soap mixes with water (it is not immiscible) rather than for…
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liquids quiz complete 1 2 3 4 5 6 7 why are liquids well suited for hyd…
The other options are incorrect: liquid density is not the key factor, liquids do not change volume easily (they are incompressible), and the number of molecules is irrelevant to …
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predict the products for the single replacement reactions given. check …
$\text{CaCl}_2 + \text{Mg}$
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liquids quiz complete 1 2 3 4 5 6 7 8 9 which type of substance is wate…
" rule. It dissolves ionic substances by hydrating ions, and also dissolves polar substances via hydrogen bonding and dipole-dipole interactions.
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liquids quiz complete 1 2 3 4 5 6 7 8 9 10 time remaining 58:54 the par…
Water particles have strong intermolecular forces.
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liquids quiz complete 1 2 3 4 5 6 7 8 9 10 what happens when a solid is…
olved solids (floating, sinking, suspending) rather than dissolution.
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temperature of chemical reactions over time 3. label the chemical react…
**Endothermic** - Citric acid and baking soda - Ammonium Chloride **Exothermic** - Calcium chloride - Sodium sulfate
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limiting reactions worksheet 3 part 1: first, write out and balance the…
Limiting reactant: $\text{P}_2\text{O}_5$; Mass of phosphoric acid: ~54 g --- ### Problem 2
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invitation if you are a dreamer, come in, if you are a dreamer, a wishe…
a. BAAABBB
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name: _________________________ percent comp. worksheet find the percen…
$\ce{Al2(SO4)3}$: Al: 15.77%, S: 28.12%, O: 56.11% $\ce{CuBr2}$: Cu: 28.45%, Br: 71.55% $\ce{NaOH}$: Na: 57.48%, O: 40.00%, H: 2.52% $\ce{(NH4)2S}$: N: 41.18%, H: 11.76%, S: 47.06…
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# 4 on the diagram fill in the phase changes in the blank provided. pha…
b. deposition
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# 3 on the diagram: fill in the phase changes in the blank provided. ph…
d. sublimation
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# 2 on the diagram: fill in the phase changes in the blank provided. ph…
a. freezing
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question 1 (1 point) # 1 on the diagram: fill in the phase changes in t…
a. freezing
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select all the correct answers. which two scientific theories were deve…
- three laws of motion - law of gravity
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20 if a bond had a electrongativity of 1.7 and higher, what type of bon…
A. ionic bond
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chemistry unit 6 stoichiometry homework / notes packet limiting reactan…
1. Limiting reactant: Magnesium ($\text{Mg}$) 2. Mass of magnesium peroxide: $\approx 27.8$ grams
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30 which contains covalent bonds? zncl₂ k₂s co₂ nacl types of chemical …
CO₂
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which of these is an empirical formula? $ce{co_{2}}$ $ce{c_{3}h_{6}}$ $…
$\text{CO}_2$
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vitamin dthe down-low on vitamin dusing vitamin d to prevent bone lossb…
1. First blank: absorb (matches the function of vitamin D for calcium; note: if restricted to the dropdown, the intended functional term aligns with enabling the body to take in c…
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1) what is the honc 1234 rule? (5pts)(put answer here.)2) explain why o…
1) The HONC 1234 rule is a bonding guideline for common organic elements: Hydrogen (H) forms 1 covalent bond, Oxygen (O) forms 2 covalent bonds, Nitrogen (N) forms 3 covalent bond…
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lets write an elegy!!!! an elegy poem is a tribute to someone who has p…
**Elegy for Grandma Elara** The porch swing still sways where you used to sit, (A) Your teacup’s faint ring on the oak still stays, (B) I trace the faint cracks where your fingers…
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stoichiometry & limiting reproblem5. $2\\ hi + ca(oh)_2 \ ightarrow cal…
2.16 grams
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4. $4fe + 3o_2 \ ightarrow 2fe_2o_3$ if 4.7 grams of $fe_2o_3$ (molar m…
Approximately 3.3 grams (or 3.28 grams) of Fe were reacted.
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18. valence electrons are found in the nucleus. true / false 19. the ma…
18. False 19. True 20. False
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elaborate on the reason why heating water up will increase the rate of …
D. The average kinetic energy of the molecules that make up the solution also increases with increasing temperature. This increase in kinetic energy allows the solvent molecules t…
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when a mixture is stirred a the rate of dissolving stops. b the rate of…
B. the rate of dissolving will increase.