Answer:
2.50x10²¹ atoms
Explanation:
First we convert the given mass of dimercaprol to moles, to do so we calculate its molar mass:
Molar Mass of HSCH₂CHSHCH₂OH = (Molar Mass of C)*3 + (Molar Mass of H)*8 + (Molar Mass of S)*2 + Molar Mass of O = 124.227 g/mol515 mg equal 0.515 g
0.515 g ÷ 124.227 g/mol = 4.146 x 10⁻³ molAs one dimercaprol molecule binds to one As atom, one mol of dimercaprol reacts with one mol of As.
So we convert those 4.146 x 10⁻³ mol of As to atoms, using Avogadro's number:
4.146 x 10⁻³ mol * 6.023x10²³ atoms/mol = 2.50x10²¹ atoms
If it takes 3.5 hours for the Hogwarts Express, moving at a speed of 120 mi/hr, to it make it from Platform
9 and ¾ to Hogwarts, how far apart are they?
Answer:
3/4 miles
Expanation:Because 9+3/4 is 3/4 miles
Please answer this for 15 points
When naming an ionic compound, which comes first, the metal or nonmetal?
Answer:
Explanation:
When naming binary ionic compounds, name the non-metal anion first
When naming an ionic compound, the name of the metal comes first.
An ionic compound is composed of a metal and a nonmetal. Usually, the metal forms the positive ion while the nonmetal forms the negative ion.
When naming an ionic compound, the name of the metal is mentioned first followed by the name of the nonmetal.
For example, when naming an ionic compound that contains sodium and chlorine, the name is sodium chloride.
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Solve the equation by first using the Quadratic Formula and then by factoring.
x2 – 14x + 48 = 0
A student increases the temperature of a 200 cm3 balloon from 60°C to 100 °C.
What will the new volume of the balloon be? Round your answer to one decimal
point.
(to convert Celsius to Kelvin, add 273.15)
Answer?
Answer:
178.56 cm3
Explanation:
V1/T1=V2/T2
V2=V1T1/T2
V1 (volume) is 200 cm3
T1 (temperature) is 60°C but convert into Kelvin
T2 (temperature) is 100 °C but convert into Kelvin
Plug in the values...
V2= (200 cm3)(60+273.15)/ (100+273.15)
V2=178.56 cm3
Answer:
178.56 cm3
Explanation:
What is the percent yield if the theoretical yield of ChCl3 is 14.50 g but the actual yield is 12.33 g?
Percentage is a ration of part to a whole. In our case, in perfect conditions, yield is theoretical and thusly considered larger, a whole. While actual yield is less because of imperfect conditions. The percentage is,
[tex](12.33\cdot 100)/14.5\approx85.03\%[/tex].
Hope this helps.
Answer: 85.03%
Explanation:
Percentage yield = (actual yield/ theoretical yield) x100
so: (12.33/ 14.50)x 100
= 85.0344827586
1. A 25.0-mL sample containing Cu2 gave an instrument signal of 25.2 units (corrected for a blank). When exactly 0.500 mL of 0.0275 M Cu(NO3)2 was added to the solution, the signal increased to 45.1 units. Calculate the molar concentration of Cu2 assuming that the signal was directly proportional to the analyte concentration.
Answer:
6.83x10⁻⁴M is the initial concentration of the Cu²⁺
Explanation:
The concentration is directly proportional to the signal (Beer-Lambert law).
The increase in concentration produce an increase in signal of:
45.1 units - 25.2 units = 19.9 units.
The increase in concentration is of:
0.500mL = 5x10⁻⁴L * (0.0275mol / L) = 1.375x10⁻⁵moles / 0.0255L = 5.39x10⁻⁴M
The conversion factor is 5.39x10⁻⁴M = 19.9 units
That means the initial concentration that produce a signal of 25.2 units is:
25.2 units * (5.39x10⁻⁴M / 19.9 units) =
6.83x10⁻⁴M is the initial concentration of the Cu²⁺After mixing the solutions in a separatory funnel, the stopper should be ________and the liquid should be ________and the layers allowed to separate. When you get close to the interface between the layers, ________the funnel and________until the first layer______ is collected. _______to collect the second layer.
Answer:
The answer is below
Explanation:
The separation technique is used for separating immiscible liquids.
When separating, the stopper has to be removed when draining the lower layer so as to prevent a vacuum. If vacuum is allowed, the draining rate will reduce and stop.
The liquid should be mixed by shaking the funnel and then opening the stopcock so as the vent out gases.
When near interface between the layers, you should set your eye level so that you do not drain up to the second layer.
After completely draining the first layer, the second layer should be collected in a new flask.
After mixing the solutions in a separatory funnel, the stopper should be removed and the liquid should be mixed thoroughly and the layers allowed to separate. When you get close to the interface between the layers, get eye level with the funnel and slow the draining until the first layer is collected. Switch to a new flask to collect the second layer.
After mixing the solutions in a separatory funnel, the stopper should be removed and the liquid should be mixed thoroughly and the layers allowed to separate. When you get close to the interface between the layers, get eye level with the funnel and slow the draining until the first layer is collected. Switch to a new flask to collect the second layer.
Separatory funnel:It is used in liquid-liquid extractions to separate (partition) the components of a mixture into two immiscible solvent phases of different densities.The lab apparatus majorly used for the separation of the two immiscible solutes in the given mixture. For example, oil and alcohol. It is applicable to separate the solvent which are immiscible and which cannot be separated by steam distillation. This method is useful for liquids only.Learn more:
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This is for science! I have until tomorrow to finish this and I need your help. Can you guys answer one of the three matters? Pleasel
I've attached a picture down below for you, if this will help. If you need further explanation, please ask me :)
Which compound has only 1 single bond?
Group of answer choices
N2
CO2
Br2
Which statement does NOT correctly compare boron with another element?
Boron is a better conductor of electricity than sulfur.
Boron conducts electricity as well as copper does.
Boron is a ſolid at room temperature, but argon is a gas.
O Boron is less malleable than silver.
In baseball home run hitters usually use a heavy bat. According to the formula for momentum why is that important
Answer:
The data shows that a heavier bat produces a faster batted ball speed. This makes intuitive sense since a heavier bat brings more momentum into the collision. ... So, using a heavier bat should result in faster hit balls, which means the hit ball will travel farther.
Explanation:
The diagram below shows part of the rock cycle.
Science, Middle school`
Which type of rock does C represent?
A. Igneous Rock
B. Rock formed by cooling
C. Rock formed by heat and pressure
D. Sedimentary Rock
I searched what each rock is called and looks like but I don't which on it is because they kinds all look the same.
Answer:
c
Explanation:
C represents C. Rock formed by heat and pressure.
What is a metamorphic rock?Metamorphic rocks are often squished, smeared out, and folded. regardless of those uncomfortable conditions, metamorphic rocks do not get warm sufficient to melt, or they would end up igneous rocks! common Metamorphic Rocks: common metamorphic rocks include phyllite, schist, gneiss, quartzite, and marble.
Metamorphic rock is any of a class of rocks that result from the alteration of preexisting rocks in reaction to changing environmental situations, such as variations in temperature, strain, and mechanical stress, and the addition or subtraction of chemical components.
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#SPJ2
A careless student forgets to label one of their reagent containers. They know it contains one of the following solutions: 0.1 M NaCl, 0.1 M Ca(NO3)2, 0.1 M KCH3COO The student decides to add some 0.1 M Pb(NO3)2 to a sample of the reagent in question. Upon stirring, a white precipitate formed. Which of the possible solutions was present in the unlabeled container based on this observation
Answer:
He kinda lazy ngl
Explanation:
Rgheeghfgufugf
6. The human arm, a bat's wing, a whale's flipper, and a horse's
foreleg are examples of
A. Analogous Structures
B. Homologous Structures
C. Vestigial Structures
D. Fossils
I
What does the equation A + BC to B + AC represent
Displacement reactions
A clear colourless liquad that can be spilt into two gasses into different properties
stoichiometry is hawd
Using the following reaction:
C12H22O11 + 12 O2 → 12CO2 + 11H2O + energy
How many grams of carbon dioxide, CO2, are produced from metabolizing 448g sucrose?
691 g CO₂
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableMolesOrganic
Organic Compounds CₓHₙStoichiometry
Using Dimensional AnalysisAnalyzing Reactions RxNExplanation:Step 1: Define
[RxN - Balanced] C₁₂H₂₂O₁₁ + 12O₂ → 12CO₂ + 11H₂O + Energy
[Given] 448 g C₁₂H₂₂O₁₁ (sucrose)
[Solve] grams CO₂ (carbon dioxide)
Step 2: Identify Conversions
[RxN] 1 mol C₁₂H₂₂O₁₁ → 12 mol CO₂
[PT] Molar Mass of C - 12.01 g/mol
[PT] Molar Mass of H - 1.01 g/mol
[PT] Molar Mass of O - 16.00 g/mol
Molar Mass of C₁₂H₂₂O₁₁ - 12(12.01) + 22(1.01) + 11(16.00) = 342.34 g/mol
Molar Mass of CO₂ - 12.01 + 2(16.00) = 44.01 g/mol
Step 3: Stoich
[DA] Set up conversion: [tex]\displaystyle 448 \ g \ C_{12}H_{22}O_{11}(\frac{1 \ mol \ C_{12}H_{22}O_{11}}{342.34 \ g \ C_{12}H_{22}O_{11}})(\frac{12 \ mol \ CO_2}{1 \ mol \ C_{12}H_{22}O_{11}})(\frac{44.01 \ g \ CO_2}{1 \ mol \ CO_2})[/tex][DA] Multiply/Divide [Cancel out units]: [tex]\displaystyle 691.119 \ g \ CO_2[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
691.119 g CO₂ ≈ 691 g CO₂
Hello I'm really in a rush this is due tonight, please help I'd really appreciate it if one of you guys answer this, (I hope you guys can help me)
Answer:
caloricenergylivingmatterkinetic, particleheat, jouleshope this helps :)
Which stimulus causes a porcupine to extend its quills?
lunar effect on Earth
seasonal temperature changes
threatening behavior by predators
environmental encroachment by humans
What is the mass of 0.0490 mole of potassium sulfate?
Answer:
8.54g
Explanation:
we know that: n=m/Mm
where:
n represents molesm represent massand Mm represents molar massrearrange for m: m= n x Mm
m= 0.0490mol x 174.259g/mol
m= 8.54g
Would you expect the amount of heat (q, in J) released or absorbed for the dissolution of 4 g of NH4NO3(s) in 50.0 g of water to be greater than, less than, or equal to, the amount of heat released or absorbed for the dissolution of 2 g of NH4NO3(s) in 50.0 g of water
Answer:
Greater
Explanation:
This is because , 4 g of NH4NO3(s) contains more number of moles than 2 g of NH4NO3(s). Since the amount of heat (q, in J) released or absorbed for the dissolution is measured in kJ/mol, the higher the number of moles , the higher the amount of energy released. Since 4 g of NH4NO3(s) contains more number of moles than 2 g of NH4NO3(s), it will thus release or absorb more heat. So, the amount of heat is greater.
Since 4 g of NH4NO3(s) contains more moles than 2 g of NH4NO3(s), it will thus absorb more heat showing that the amount of heat is greater.
Balancing chemical reactionFrom the given information, we are to determine whether the amount of heat released or absorbed is greater or lesser.
From the question, 4 g of NH4NO3(s) contains more moles than 2 g of NH4NO3(s).We must also know that the higher the number of moles of a compound, the higher the amount of energy releasedSince 4 g of NH4NO3(s) contains more moles than 2 g of NH4NO3(s), it will thus absorb more heat showing that the amount of heat is greater.
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2. How might this population suddenly increase? How might this affect the ecosystem? (for tropical savannah.)
Explanation:
it can suddenly increase when more and more people have babies and the infant rate goes up. and how it might affect the ecosystem is the pollution that people give off.
Answer:
Explanation:
Due to less predators in the Savannah/habitat, the population could unexpectedly grow. This will have an impact on the environment because it will give rise to more prey as there will be fewer predators. If too many herbivores are present on one feeding site, competition for food will occur. If there are more plants in an area than normal, it can increase the population of animals that consume the plant. If the population of one animal rises, the population of animals that consume that animal could also rise.
Population growth isn't always good. A population may often grow too big to sustain the climate. Other modifications in limiting variables can cause a population to decline. The population will decrease if a population becomes diseased, and the population of animals that consume the diseased animals will decrease as well. Populations in nature typically balance themselves. Sometimes, they can't always restore a natural balance as man affects populations.
How is wave technology used in medical field ?
Plz answer ASAP thank you
A. The ivy had more genes than the cactus
B. Natural selection choose to kill the cactus
C. The ivy had good genes, but the cactus had bad ones
D. The environmental conditions were right for the ivy but wrong for the cactus
how do plants release carbon into the atmosphere
Answer:
Plants release more carbon dioxide into atmosphere than expected. ... Plants use photosynthesis to capture carbon dioxide and then release half of it into the atmosphere through respiration. Plants also release oxygen into the atmosphere through photosynthesishesis to capture carbon dioxide and then release half of it into the atmosphere through respiration. Plants also release oxygen into the atmosphere through photosynthesis.
Need help I don’t understand this at all need to show my work and strategy it’s stoichiometry gram to gram please help
Answer:
781×10¯² g of MgCl₂.
Explanation:
The balanced equation for the reaction is given below:
Mg + 2HCl —> MgCl₂ + H₂
Next, we shall determine the mass of HCl that reacted and the mass of MgCl₂ produced from the balanced equation. This is illustrated below:
Molar mass of HCl = 1 + 35.5
= 36.5 g/mol
Mass of HCl from the balanced equation = 2 × 36.5 = 73 g
Molar mass of MgCl₂ = 24 + (35.5×2)
= 24 + 71
= 95 g/mol
Mass of MgCl₂ from the balanced equation = 1 × 95 = 95 g
SUMMARY:
From the balanced equation above,
73 g of HCl reacted to produce 95 g of MgCl₂.
Finally, we shall determine the mass of MgCl₂ produced by the reaction of 6 g of HCl. This can be obtained as follow:
From the balanced equation above,
73 g of HCl reacted to produce 95 g of MgCl₂.
Therefore, 6 g of HCl will react to produce = (6 × 95)/73 = 781×10¯² g of MgCl₂.
Thus, 781×10¯² g of MgCl₂ were obtained from the reaction.
What is the specific heat of a 44 g piece of metal if 202 Joules of heat are required to
raise the temperature from 22ᵒC to 33.6ᵒC?
Answer:
≈ 395,8 J/(kg * °C)
Explanation:
m = 44 g = 0,044 kg
[tex]t_{1}[/tex] = 22 °C
[tex]t_{2}[/tex] = 33,6 °C
Q = 202 J
The formula is: Q = c * m * ([tex]t_{2} - t_{1}[/tex])
c = [tex]\frac{Q}{m * (t_{2} - t_{1} )}[/tex]
Calculating:
c = 202 J / 0,044 kg * (33,6 °C - 22 °C) ≈ 395,8 J/(kg * °C)
How many atoms are in 34 g of Cu?
Answer:
Babygirl these are double DD'S
Explanation:
OooOOO I'm hurt oh my neck my neck and my back
How long did it take a bike to travel 20 miles at 12 mph
Answer: 4 miles
Explanation:
Riding the bike 12 mph (miles per hour) for one hour, we would ride the bike 12 miles. Since 20 minutes is 1/3 of a hour, divide 12 by 3 to find out how far the biker traveled in 1/3 of the time: 4 miles Hope this helps
Hello!
[tex]\large\boxed{\frac{5}{3}\text{ hours} \text{ or }100 \text{ min}}[/tex]
Use the equation d = s · t where:
s = speed
t = time
d = distance
Plug in the given distance and speed:
20 = 12 ·t
Divide both side by 12 to isolate for t:
20/12 = t
Simplify:
5 / 3 = t
Therefore, it took 5/3 hours to bike. We can convert this to minutes if necessary:
5/3 · 60 min (in one hour) = (60 · 5) / 3 = 100 min.