Answer:
1.86% Na₂CO₃
Explanation:
The additional volume that is required to reach endpoint with methyl orange indicator is due the presence of carbonate (Calculated as sodium carbonate). The reaction is:
Na₂CO₃ + 2HCl → H₂O + CO₂ + 2NaCl
Thus, we need to obtain moles of HCl and, using the reaction, solve for moles of sodium carbonate, its mass and percentage using molar mass of Na₂CO₃: 106g/mol.
Moles HCl:
0.700mL = 0.700x10⁻³L * (0.100mol / L) = 7.00x10⁻⁵moles HCl
Moles Na₂CO₃:
7.00x10⁻⁵moles HCl * (1mol Na₂CO₃ / 2 mol HCl) = 3.5x10⁻⁵ moles Na₂CO₃
Mass:
3.5x10⁻⁵ moles Na₂CO₃ * (106g / mol) = 0.00371g Na₂CO₃
Percentage:
0.00371g Na₂CO₃ / 0.200g * 100 =
1.86% Na₂CO₃Based on the octet rule, phosphorus most likely forms a ________ ion.
A. P5+
B. P3+
C. P5-
D. P3-
E. P+
Based on the octet rule, phosphorus most likely forms a P³⁻ ion; option D.
What is the octet rule?The octet rule is a rule which describes the way in which atoms of elements behave in terms of electron arrangement or distribution in order to achieve stability.
The octet rule states that atoms of elements achieve stability when they have eight electrons in their valance shells.
It explains that atoms of elements will gain, lose or share a certain number of electrons in order to achieve the stable electronic configuration of the noble gases.
Phosphorus has five electrons in its valence shell and will accept three electrons in order to have an octet.
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How many hydroxide ions are bonded to each aluminum ion?
Answer:
3
Explanation:
edge 2020
There are 3 hydroxide ions bonded to each aluminum ion.
Aluminum belongs to the 13th group of the periodic table. It has 13 electrons in the orbitals. According to the electron distribution rule, there are 3 valence electrons in the aluminum ion.
In the molecule of hydroxide, the oxygen has 5 valence electrons capable of the formation of the double bond. The bonding of the hydroxide ion with the aluminum ion will complete the octet of Aluminum and oxygen by the formation of the double bond.
So Aluminum can form 3 bonds with hydroxide ions. 2 double contributing to 4 electrons and 1 single bond completing the octet of Aluminum.
Thus Aluminum can form 3 bonds with hydroxide ions.
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20 POINTS!!!
3. Which substance will take more energy to heat from 20C to 100C?
a) 30 g of water
b) 300 g of water
and WHY?
Answer:
300g of water because its a larger amount
Explanation:
What is the value of freezing point depression of a solution of 15.0g of NaCl in 250g of water?
Answer:
-3.82ºC is the freezing point of solution
Explanation:
We work with the Freezing point depression to solve the problem
ΔT = m . Kf . i
ΔT = Freezing point of pure solvent - freezing point of solution
Let's find out m, molality (moles of solute in 1kg of solvent)
15 g / 58.45 g/mol = 0.257 moles of NaCl
NaCl(s) → Na⁺ (aq) + Cl⁻(aq)
i = 2 (Van't Hoff factor, numbers of ions dissolved)
m = mol /kg → 0.257 mol / 0.250kg = 1.03 m
Kf = Cryoscopic constant → 1.86 ºC/m (pure, for water)
0ºC - Tºf = 1.03m . 1.86ºC/m . 2
Tºf = -3.82ºC
How can being Energy Independent be a bad thing?
Kevin was carrying out the following steps as part of an experiment.
What was the topic of this experiment?
A. The water cycle
B. The circulation of global winds
C. The formation of ocean currents
D. The formation of a hurricane over water
Answer: Its (c)
Explanation: Hope this helps!!
Why do you have to have set amounts of compounds
Answer:
compounds, on the other hands can have their bonds broken with practical amounts of energy, such as the heat from a fire. Matter can be broken down into two.
Lana is testing her hypothesis that marigolds grow faster in red light than in yellow light. If the plants in yellow light grow faster during her experiment what should Lana do next? A. Assume that she made a mistake during the experiment B. Report that her hypothesis was useless C. Conclude that the experiment did not work D. Repeat the experiment to confirm the result
If the plants in yellow light grow faster during her experiment, Lana should repeat the experiment to confirm the result. Option D.
Testing hypothesesIn science, hypotheses are tested using experiments. Two hypotheses are usually formed during the course of experimentation:
Null hypothesisAlternate hypothesisThe null hypothesis is set up to either be accepted is found to be true or rejected if found to be false. The alternate hypothesis is just there for guidance.
Hypotheses being found not to be true does not always mean that the reverse will be true.
Thus, if a complete opposite is obtained during testing, the next thing would be to repeat the experiment in order to be double sure there was not a mistake.
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What is the Kc and Kp of
P4(s)+6Cl2(g) = 4PCla-
Answer:
dfbdbdfbfd
Explanation:
regergfdbffg
It refers to the cracked sections of the earth's crust.
Answer:
Plates
Explanation:
The Earth's crust is broken up into sections called plates. Tectonic plates are on the mantle which allow them to move.
A piece of tin has a mass of 16.52 g and a volume of 2.26 cm3 what is the density of tin?
Answer:
The density of tin is 7.31 g/cm³.
Explanation:
Given that the formula of density is D = m/v where m represents mass and v is volume :
D = 16.52/2.26
D = 7.31 g/cm³ (3sf)
HELP WILL GIVE BRAINLEIST AND THIS ALOT OF POINTS
The table below compares wildlife supported by two plants growing around a lakeside ecosystem in South Florida.
Plant Species and Wildlife Data
Plant Species Wildlife Supported
Sawgrass Alligators, Snails
Melaleuca None
After a 25-year period, 95% of the ecosystem was covered by melaleuca. What would be the likely impact of this on the wildlife population?
Decreases, as shelter is a limiting factor
Increases, as shelter is a limiting factor
Decreases, as water is a limiting factor
Increases, as water is a limiting factor
Answer:
decreases
Explanation: decreases,as shelter is a limiting factor becasue the trees for example were there home now it is covered in melaleuca
hope this helps
Answer:
a should be the correct answer
Explanation:
there will not be many shelters that suit some animals needs
Did the transformed plant grow into a healthy mature plant?
If not, you may have chosen a bad callus. (Click Back to try a different callus.)
Answer:
yeh if we transfer to a suitable place and transferm by not harming it then it will be a healthy mature plant . We should just replace it in right time,place and weather .
What is the proper way of collection, preservation and transition of hair?
How many grams of sodium hydroxide is exactly required to react with 3.86 mol of sulfuric acid?
Answer:
20.4g NaOH
Explanation:
Because, trust the drip, trust the drip
On Stemscopes
take your time.
Rapid growth of algae in a pond is often the result of-
O loss of habitat due to commercial building.
O flooding that causes water level to rise.
O excess nutrients from fertilizer runoff.
O clogged river tributaries entering a lake.
Answer:
The answer is 3
Explanation:
The nutrients from fertilizer runoff is the most probable answer, because the other 3 dont contribute to algae growth
Answer:
excess nutrients from fertilizer runoff.
Explanation:
How many standard amino acids are there in the human body?
What is the least number of peptides in a polypeptide?
Answer:
-Theres 20 amino acids in the human body
-The least number of amino acids in a polypeptide are 10
Explanation:
Two students stand close to each other Why do they not get pulled closer to each other due to the gravitational pull they exert on each other
Answer:
there gravitational force is very less to pull the weight of a person.
Two students who stand close to each other don't get pulled closer as a
result of gravitational force because the magnitude of the force is small.
Gravitational force acts on all objects on Earth but the force exerted is very
small as a result of the masses of the students being very small as to when
compared with that of the earth.
The large difference in mass of the student and earth is the reason why the
effect of the force is very little and unable to move them closer.
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Will MARK U AS BRAINLIEST IF U GIVE RIGHT ANSWER
Answer:
C
Explanation:
Which combination will produce a precipitate?
A) Naf (aq) and HCl (aq)
B) KOH (aq) and Mg(NO3)2 (aq)
C) NaOH (aq) and HCI (aq)
D) NaC2H302 (aq) and HCl (aq)
E) AgNO3(aq) and Ca(C2H302)2 (aq)
Answer: B
Explanation:
All acetates are soluble...
All halides are soluble EXCEPT for those of
A
g
X
,
H
g
2
X
2
,
and
,
P
b
X
2
...
All salts of the alkali metals are soluble....
All hydroxides are INSOLUBLE except for those of the alkali metals...
For
option c
we are likely to observe a fine precipitate
Describe how you could use the scientific method to develop the best time schedule for the nights your volleyball team has games.
Answer: In theory, the scientific method can be used to answer virtually any question imaginable. The scientific method is a consistent approach to acquiring knowledge that begins with a question and then uses a combination of research, testing and analysis to arrive at the answer to the question.
QUESTION:
What was the Proclamation of 1763? *
ANSWER CHOICES:
A. A law passed by the British parliament that allowed colonial movements west of the Appalachian Mountains.
B. A law passed by the French parliament that prohibited colonial movements west of the Appalachian Mountains.
C. A law passed by the British parliament that prohibited colonial movements west of the Appalachian Mountains.
D. A law passed by the President that prohibited colonial movements west of the Appalachian Mountains.
Answer:
C. A law passed by the British parliament that prohibited colonial movements west of the Appalachian Mountains.
Explanation:
Answer:
✔ Cumberland Gap
was a natural mountain pass through the Appalachian Mountains.
This is the Correct Answer!
This might not be the same Question. This is history 5th Unit.
Mrs. Elder travelled from Zillah, WA to Tacoma, WA in 3 hours. She traveled 201 miles on the trip. What was the speed she traveled at with no stops? (Speed=Distance/Time)
Answer:
201 ÷ 3 = 67mph
Explanation:
let me know if you want me to explain more
In an atom, electrons:
A. Are located in the nucleus
B. Sitting still on the edge of an energy level
C. Moving around the outside of the nucleus
D. Paired with a neutron
Answer:
C
Explanation:
Answer: c
Explanation:
give brainlest
facing the wind. A) windward B) subaric C) monsoon D) biotic
A student with a body temperature of 37°C holds a piece of
ice that has a temperature of -8°C.
Vhich statement best explains what happens?
A. Thermal energy transfers coldness from the student's hand to the
ice.
B. Thermal energy transfers heat from the student's hand to the ice.
C. Heat transfers thermal energy from the student's hand to the ice.
D. Heat transfers coldness from the ice to the student's hand.
Answer:
D i think. Not sure.
Explanation:
I mean i just did it myself, and i dont really do chemistry, but I would say D sorrry if i made you get it wrong!!
Answer:
C. Heat transfers thermal energy from the student's hand to the ice.
Explanation:
I got it right on my test apix
50 POINTS!!! DUMB ANSWERS WILL BE DELETED
explain earth rotation and how days and nights are shifted
Answer:
Hope this isnt dumb!
Explanation:
Earth rotates on a axle this causes us to experience a day and night moment but however Earth's axis is tilted 23.5 degrees the and angled to measure between Earth's equatorial plane in the plane in which orbits are sun.
Answer:
The Earth rotates on it's axis, and it takes 24 hours for the Earth to go all the way around. When the part of the Earth you're on is facing the sun, you have daytime. When the part of the Earth you're on is not facing the sun (facing the moon instead), you have nighttime.
I hope this helps!
Anyone know what room temperature lemon juice feels like it's for a project and I don't have it. Will give brainly!!!!
Answer:
Since both hot and cold temperature extremes can negatively affect the enzymes, vitamins, and nutrients in lemons when making lemon water, room temperature water between 68 degrees to 79 degrees Fahrenheit is the best option.
Explanation:
hope it helps you
You have 85.63 g of CO2, how many molecules of CO2 are in that
container?
Ans:
______X 1024 molecules of CO2
Explanation:
1.17×10^24 molecules of co2
3 HBr + Al(OH)3 ⇒ 3 H20 + AlBr
Answer:
Balanced equation: 3HBr + Al(OH)3 → 3H2O + AlBr3
Hydrogen Bromide + Aluminum Hydroxide = Water + Aluminum Bromide
Explanation:
Hoped this helped you but I wasn't sure was this what you were asking for!!!
Have a great day!!