Answer:
b c
Explanation:
Answer: b c
Explanation: i did test
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 really need help.
Answer
Solid
liquid
Gas
Explanation:
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
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.
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.
what is the answer?!!?
Plzzzz help
Answer:
The planet would stop
Good luck!
A student says that since the atomic theory is just a theory, it should not be considered useful. Which statement best argues against the student’s opinion?
Scientific theories change over time.
Scientific theories are the results of many experiments and observations.
Scientists often do not agree about specific details of scientific theories.
Scientists often propose competing theories.
Scientific theories do not become Scientific Laws.
Answer:
srry
Explanation:
Answer:
Scientific theories are the results of many experiments and observations.
Explanation:
Sooo BBBBBBBBB
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
After conducting SDS-PAGE, you will conduct a staining/destaining procedure, which allows for visual identification of the proteins in your gel. This procedure requires the following staining solution: Coomassie Blue staining solution: 0.1% Coomassie Blue dye (dry powder) in 50% methanol, 10% acetic acid.
Required:
How to make 1 L of this solution?
Answer:
Add 700mL of water.
Explanation:
The technique of separation known as the Sodium Dodecyl Sulfate Poly-Acrylamide Gel Electrophoresis in which its acronym is SDS- PAGE is a very important aspect of Chemistry and Biochemistry as the technique make use of molar mass when it work in seperating proteins.
From the question we have the following parameters or information:
Case 1=> 50% of methanol which is the same as saying 50mL in 100mL of water.
Case 2=> 0.1% Comasse Blue dye (dry powder) which is the same as saying 0.1g in 100mL of water.
Case 3=> 10% acetic acid is the same as saying 10mL in 100mL of water.
Adding the three together, we have ;
50mL in 100mL of water + 0.1g in 100mL of water + 10mL in 100mL of water.
The volume of water in the three = 100 mL + 100mL + 100mL = 300mL.
Therefore, there is need to add 700mL of water to make 1L.
That's 700mL of water + 300mL = 1000mL = 1L
Determine the energy released per kilogram of fuel used.
Answer:
what is the energy rate? or how much energy do you have.
Explanation:
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)
Which stimulus causes a porcupine to extend its quills?
lunar effect on Earth
seasonal temperature changes
threatening behavior by predators
environmental encroachment by humans
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.
How is wave technology used in medical field ?
Plz answer ASAP thank you
Use Hess’s Law and solve for the enthalpy change of the following rxn:
12 P(s) + 10 Fe2O3 (s) -> 3 P4O10 (s) + 20 Fe (s)
2 C2H6 (l) + 7 O2 (g) -> 4 CO2 (g) + 6H2O (g)
Dang that is messed up you have a EVIL teacher to do that to you
3.0m3 of sulfer dioxide is reacted with 2.0dm3 of oxygen . What volume of sulfur trioxide is form?
Answer:
3.0 dm^3 of sulphur trioxide is formed
Explanation:
From Gay Lussac's law of combining volumes;
The equation is;
SO2(g) + 1/2O2(g) ------> SO3(g)
Reacting volumes 1 vol 1/2 vol 1 vol
Initial volumes 3.0 dm^3 2.0 dm^3 0.0 dm^3
Final volumes 0.00 dm^3 1.5 dm^3 3.0 dm^3
Hence, 3.0 dm^3 of sulphur trioxide is formed.
1. Determine the mass of 2.5 mol of AgNO3
Explanation:
1 gram of AGNO3 is 169,87 g/mol
2.5 mole = 2.5×16987
= 42467
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
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 :)
Classify each of the substances as an atomic element, molecular element, molecular compound, or ionic compound. Provide one sentence explanation for each. a. fluorine b. N2 O c. silver d. K2 O e. Fe2 O3 g
Answer and Explanation:
a. fluorine ⇒ atomic element
Fluorine (F) is a chemical element because it is a pure substance that cannot be decomposed into simpler substances.
b. N₂O ⇒ molecular compound
We can see that N₂O (nitrous oxide) is a molecule composed by two different atomic elements: nitrogen (N) and oxygen (O). Thus, it is a molecular compound.
c. silver ⇒ atomic element
Silver is a chemical element with the symbol Ag. It is a pure substance which cannot be decomposed into simpler substances.
d. K₂O ⇒ ionic compound
Potassium oxide (K₂O) is composed by a metallic element (potassium, K) and a non-metallic element (O). Thus, there is a difference in the electronegativity of the chemical elements, so the substance can dissociate into ions. In consequence, it is an ionic compound.
e. Fe₂O₃ ⇒ molecular compound (with ionic character)
Iron(III) oxide (Fe₂O₃) is composed by iron element (Fe), which is a metal, and oxygen element (O), which is a non-metal. Since it is a Metal- Non-Metal combination, it would be an ionic compound. The difference in electronegativity between Fe and O is not high (<2.0) in comparison with other ionic compounds, so Fe₂O₃ is considered as a polar covalent compound (it is between an ionic compound and a molecular compound).
What is the chemical formula for a molecule of salt?
Answer:
Su fórmula molecular es Na Cl y es el producto de la base hidróxido sódico (NaOH) y ácido clorhídrico, H Cl. En general, las sales son compuestos iónicos que forman cristales. Son generalmente solubles en agua, donde se separan los dos iones. Las sales típicas tienen un punto de fusión alto, baja dureza, y baja compresibilidad.
Explanation:
What is the mass in grams of 5.2 moles of NaCl?
303.89 g
0.09 g
119.6 g
1828
Explanation:
mole=mass/molar mass
mass= mole×molar mass
m= 5.2×( 23+35.5)
m= 5.2×58.5
m= 304.2g
What happens as the activation energy increases?
The pressure of the system decreases.
The kinetic energy of colliding molecules changes.
The reactant surface area decreases.
The reaction begins to slow down.
Answer:
the kinetic energy of colliding molecules changes
Average kinetic energy is the average sum of all kinetic energy of all the molecules of gases. Therefore, the correct option is option B that is the kinetic energy of colliding molecules changes.
What is kinetic energy?It is a energy which is possess by a moving object. It is very difficult to find the correct value of kinetic energy so we find average kinetic energy. Which is very easy to calculate as compared to calculating kinetic energy. It is not dependent on the type of gases or mass of gases.
Mathematically,
K.E=1/2mv²
Where,
m= mass of object
v= velocity of object
As the activation energy increases, the kinetic energy of colliding molecules changes.
Therefore, the correct option is option B that is the kinetic energy of colliding molecules changes.
Learn more about the kinetic energy, here:
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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 does the equation A + BC to B + AC represent
Displacement reactions
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
Analyze Between visits 1 and 7, what kind of ecological succession is shown? Explain your answer.
Answer:
Is there supposed to be a picture??
Explanation:
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.
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 :)
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: