Answer:
Its B
Explanation:
The answer above this one is right.
The strong acid and strong base has high rate constant of dessociation. Weak acid and base are the one whose rate constant for the dissociation is low, they do not dissociate readily in water. Therefore the strongest base among all is NaOH
What are acid and base?Acid is a solution which releases H⁺ hydrogen ion when dissolved in water. Base are the solution which relaeases hydroxide ion OH⁻ ion when dissolved in water
According to our question we are given four solutions HCl, NaOH, NH₃, H₃CO₃. Out of which HCl and H₃CO₃ are the acids as they release hydrogen ion in water. NaOH and NH₃ are base.Out of which NaOH is the one which readily give hydroxide ion when dissolved in water
Therefore the strongest base among HCl, NaOH, NH₃, H₃CO₃ is NaOH
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You are performing an
experiment in your lab. To
compare with other experiments
your results must be in moles.
During your final step you burn a
strip of magnesium (Mg), which
results in 187 grams of
magnesium oxide (MgO). How
should you enter your results?
PSP
O
A. 7.7 moles Mgo
B. 4.6 moles Mgo
C. 187 grams Mgo
D. 7536.1 moles Mgo
Resot Selection
Answer:
4.6 moles MgO
Explanation:
number of moles is equals to the mass in grams divided by RFM
RFM=16+24.3=40.3
187/40.3
=4.6 moles of MgO
During your final step you burn a strip of magnesium (Mg), which results in 187 grams of magnesium oxide (MgO) the results would be 4.6 moles Mgo. option B is correct.
What are moles?The value of one mole is given by Avogadro's number which is 2.303 × 10²³ moles but here the used weight is given so number of moles will be calculated with other formula.
A strip of magnesium (Mg), which results in 187 grams of magnesium oxide (MgO) number of moles will be,
n = W / M
where , n = number of moles
W = given weight
M = molar mass
substituting the values in equation,
n = 187 / 40.30
n = 4.6 moles
Therefore, final step you burn a strip of magnesium (Mg), which results in 187 grams of magnesium oxide (MgO) the results would be 4.6 moles Mgo. option B is correct.
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What does the latent heat of fusion measure?
Answer:
The energy required to change the phase of a substance is known as a latent heat.
Explanation:
The energy require is Q= m L, where m is the mass of the substance and L is the specific latent heat of fusion or vaporisation which measures the heat energy to change 1 kg of a solid into a liquid. hope this helps you :)
Answer & Explanation:
The energy required to change the phase of a substance is known as a latent heat. ... The energy require is Q= m L, where m is the mass of the substance and L is the specific latent heat of fusion or vaporization which measures the heat energy to change 1 kg of a solid into a liquid.
Scientific evidence shows that Earth's diameter, and thus overall size, does.
not change. This evidence goes against which two theories?
A. Expanding Earth
B. Plate tectonics
U
C. Contracting Earth
D. Continental drift
SUBMIT
Answer:
Expanding earth and contracting earth
Explanation:
Answer:
A and C
Explanation:
what’s the mass of 0.0485 moles of Na2CO3
Answer:5.1g
Explanation:number of moles of Na2co3 is 0.0485 and it molar mass = 23×2+12+16×3=106
n=m/M
Therefore m= n×M
m= 0.0485×106
=5.141g
The mass of 0.0485 moles of Na2CO3 of 5.141 grams.
What is mass?Mass is defined as a dimensionless number used to describe the mass of a particle or item. Inertia, or the body's resistance to acceleration when a net force is applied, is also measured by this term. The strength of an object's gravitational pull to other bodies is also influenced by its mass. The kilogram serves as the SI's fundamental mass unit. Mass is a physical body's total amount of matter. Gravity and inertia, which are the two main forces influencing how objects move in space, make mass crucial.
Mass can be calculated as
Mass = molar mass x number of moles
Molar mass = 23 x 2 + 12 + 16 x 3
= 106 grams
Mass = 106 x 0.0485
= 5.141 grams
Thus, the mass of 0.0485 moles of Na2CO3 of 5.141 grams.
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The average score for games played in the NFL is 21.1 and the standard deviation is 8.9 points. 46 games are randomly selected. Round all answers to 4 decimal places where possible and assume a normal distribution.
A. P(21.4317 < ¯x < 22.7561) =
B. Q1 for the ¯x distribution =
The line next to the x should be over the x.
Answer:
A) P(21.4317 < ¯x < 22.7561) = 0.2975
B) Q1 for the ¯x distribution = 21.9844
Explanation:
The Central Limit theorem allows us to say that
Sample mean = Population mean = 21.1 points
Mean of sampling distribution = σₓ = (σ/√n)
σ = population standard deviation = 8.9 points
n = sample size = 46
σₓ = (8.9/√46) = 1.3122334098 = 1.3122
A) P(21.4317 < ¯x < 22.7561) =
This is a normal distribution problem
To find this probability, we will use the normal probability tables
We first normalize/standardize 21.4317 and 22.7561.
The standardized score of any value is that value minus the mean divided by the standard deviation.
For 21.4317
z = (x - μ)/σ = (21.4317 - 21.1)/1.3122 = 0.25
For 22.7561
z = (x - μ)/σ = (22.7561 - 21.1)/1.3122 = 1.26
The required probability
P(21.4317 < ¯x < 22.7561) = P(0.25 < z < 1.26)
Checking the tables
P(21.4317 < ¯x < 22.7561) = P(0.25 < z < 1.26)
= P(z < 1.26) - P(z < 0.25)
= 0.89617 - 0.59871
= 0.29746 = 0.2975 to 4 d.p.
B) Q1 for the distribution is the first quartile. The first quartile is greater than 25% of the distribution.
P(x > Q1) = 0.25
Let the z-score that corresponds to Q1 be z'
P(x > Q1) = P(z > z') = 0.25
But P(z > z') = 1 - P(z ≤ z') = 0.25
P(z ≤ z') = 1 - 0.25 = 0.75
From the normal distribution tables,
z' = 0.674
z' = (Q1 - μ)/σ
0.674 = (Q1 - 21.1)/1.3122
Q1 = 0.674×1.3122 + 21.1 = 21.9844228 = 21.9844 to 4 d.p.
Hope this Helps!!!
Which of the following chemical reactions is reversible?
A. The burning of wood.
OB. The dehydration of copper sulfate (CuSO4).
O C. The neutralization of an acid.
OD. The freezing of water into ice
Reset Selection
hi:) how to do question 3?:)
Answer:
5
Explanation:
Distilled water has a pH of 7 while CO2 is slightly acidic and therefore if we combine both substances we should get a pH just below 7 which if 5
Answer:
A) 5
Explanation:
5
The pH of distilled water immediately after distillation is 7, but within hours after distillation, it has absorbed carbon dioxide from the atmosphere and become acidic with a pH of 5
Determine the new pressure of a sample of hydrogen gas if the volume and moles are constant, the initial pressure is 6.0 atm, and it is heated from 15°C to 30.°C. PLEASE HELP ASAP! THANK U SO MUCH!
6.3 atm
5.7 atm
12 atm
3.0 atm
Answer:
6.3 atm.
Explanation:
Data obtained from the question include:
Initial pressure (P1) = 6 atm
Initial temperature (T1) = 15°C = 15°C + 273 = 288K
Final temperature (T2) = 30°C = 30°C + 273 = 303K
Final pressure (P2) =..?
Since the volume and number of mole of the hydrogen gas sample is constant, the following equation will used to obtain the new pressure:
P1/T1 = P2/T2
6/288 = P2 /303
Cross multiply
288 x P2 = 6 x 303
Divide both side by 288
P2 = (6 x 303) /288
P2 = 6.3 atm
Therefore, the new pressure of the hydrogen gas sample is 6.3 atm.
give three example of mixture that can be separated by filtration process
Answer:
Mixture of sand and water.Mixture of chalk particles in water.Mixture of pebbles and water.Explanation:
Hope it helps.
How can we tell the difference between gases like hydrogen, oxygen, and carbon dioxide cause they all look to same?
Answer:
The critical chemical difference is that CO2 contains one atom of carbon and two atoms of oxygen, whilst CO has one carbon and one oxygen atom.
How many grams of carbon dioxide does a hummingbird emit daily?
Answer:
3.5 g CO2
Explanation:
A hummingbird emits up to 3.5 grams of CO2 a day.
Equation:7.9 x 10‒2mol CO2x (44.01 g CO2/ 1 mol CO2)
=3.5 grams
Hope this helps!
To draw a Lewis structure for a polyatomic ion, begin by calculating A, the available electrons, and N, the needed electrons. What is N for CIO3-, the chlorate ion?
Answer:
N for chlorate ion is one
Explanation:
Because N is the number of electrons needed to form octet structure causing a negative charge of one, since it already has 25valence electrons
Answer: 26
Correct Answer
Compound is the fundamental type of matter that has unique set of properties and cannot be broken down into simpler form.
Answer: Compound
Explanation: pure substance that cannot be broken down into simpler substances by chemical or physical means. Each element has unique physical and chemical properties.
What type of nuclear decay is shown by the reaction below?
2390 → He + 23% Th
O A. Fusion
B. Alpha
C. Beta
D. Gamma
Answer:
B. Alpha
Explanation:
Alpha decays always split into an element and He.
Beta decays always split into an element and e- (eletrons).
Gamma decays always split into an element and radiation.
How many molecules are in each sample?
A. 4.9 g H2O
B. 54.4 g N^2
C. 89 g CCI4
D. 11 g C6H12O6
Answer:
To find the number of molecules first find the number of moles.
number of moles (n) = mass / molar mass (M)
then use the formula
N = n × L
where n = number of moles
N = number of entities
L = Avogadro's constant = 6.02 × 10^23entities to find the number of molecules
A. 4.9 g H2O
m = 4.9g
M = (2*1)+(16×1) = 2 + 16 = 18g/mol
n = 4.9/18 = 0.272mol
N = 0.272 × 6.02 × 10^23
= 1.6374*10^23 molecules of H2O
B. 54.4g of N2
m = 54.4g
M(N2) = 14×2 = 28g/mol
n = 54.4/28 = 1.942mol
N = 1.942 * 6.02*10^23
= 1.1690*10^24 molecules of N2
C. 89 g CCI4
m = 89g
M(CCl4) = 12 + (35.5 × 4) = 154g/mol
n = 89/154 = 0.577mol
N = 0.577 × 6.02 × 10^23
= 3.473*10^23 molecules of CCl4
D. 11 g C6H12O6
m = 11g
M(C6H12O6) = (12×6)+(12×1)+(16×6) =
180g/mol
n = 11/180 = 0.0611mol
N = 0.0611 × 6.02×10^23
= 3.678*10^22 molecules of C6H12O6
Hope this helps
Which answer below correctly identifies the type of change and the explanation for the boiling of water?
o physical change because even though the change caused the temperature of the water to
increase, the water's physical properties remained exactly the same
o physical change because even though gas formation was observed, the water was undergoing a
state change, which means that its original properties are preserved
chemical change because gas formation was observed, which indicated that the water was
transformed into a different substance
O chemical change because a temperature change was observed, which indicated that the water
was transformed into a different substance
Answer:
O chemical change because a temperature change was observed, which indicated that the water
Explanation:
I have taken this class
Drag each label to the correct location. Match the climate zones to their relative temperature levels. (coldest zonehottest zonemoderate temperature zone)
Answer:
Polar Zones - Coldest Temperature
Temperate Zones - Moderate Temperature
Tropical Zones - Hottest Temperature
Explanation:
The closer you are to the Equator, the hotter it gets, as the sun hits the middle of the Earth the most. At the poles, the sun hits it there the least, so it is the coldest. In between, we would have a mild between hot and cold.
*Remember that the Earth is at a tilt, and that is why we have seasons and why the Equator is so hot and the Poles are so cold.
Answer:
I answered the question on edmentum and that person was correct.
Explanation:
The polar zone is the coldest because the Sun’s rays hit this part of Earth at a wide angle, causing their energy to be spread thinly over a large surface area.
The topical zone is the hottest because the Sun’s rays hit this part of Earth nearly straight on, focusing the heat on a small surface area.
The temperate zone experiences moderate temperatures because the Sun’s rays hit this zone at an angle that concentrates the heat on a surface area that is smaller than on the polar zone and larger than on the tropical zone.
Calculate the mass (in grams) of hydrogen gas produced when 33.61 g of
diborane (B2H) reacts with excess water.
B Holg) + 6H2O(1)→ 2 H3B03(s) + 6H2(g)
Only enter numerical value without units.
Answer:
14.40g of H2
Explanation:
The balanced equation for the reaction is given below:
B2H6(g) + 6H2O(l) → 2H3BO3(s) + 6H2(g)
Next, we shall determine the mass of B2H6 that reacted and the mass of H2 produced from the balanced equation. This is illustrated below:
Molar mass of B2H6 = (2x11) + (6x1) = 28g/mol
Mass of B2H6 from the balanced equation = 1 x 28 = 28g
Molar mass of H2 = 2x1 = 2g/mol
Mass of H2 from the balanced equation = 6 x 2 = 12g
From the balanced equation above,
28g of B2H6 reacted to produce 12g of H2.
Finally, we shall determine the mass of H2 produced when 33.61g of B2H6 reacted with excess water. This can be obtained as follow:
From the balanced equation above,
28g of B2H6 reacted to produce 12g of H2.
Therefore, 33.61g of B2H6 will react to produce = (33.61 x 12)/28 = 14.40g of H2.
Therefore, 14.40g of H2 were produced from the reaction.
Bird wings and dragonfly wings are both used for flight.
Answer:
Yes
Explanation:
What's the question?
Answer:
yes, they both use it to fllight.
Explanation:
As they are adapted to flight to various places to catch their prey and be safe from various type of harms.
hope it helps..
In which two places is aggregate generally found? A.floodplains and alluvial fans B.alluvial fans and mines C.mines and beneath the topsoil D.beneath the topsoil and above the topsoil ED2020
Answer:
A.floodplains and alluvial fans .
Explanation:
Hope it helps.
Answer:A)
Explanation:
1.1 The elements with the lowest ionization energy of all element are
O The noble gases
O The alkali metals
O The alkaline earth metals
O The halogens
Answer:
O The alkali metalsThe elements with the lowest ionization energy of all element are alakli metals
Explanation:
According to research,
The element with the lowest ionization energy is cesium (Cs). Cesium has atomic number 55 and is in the fifth row of the periodic table.
Caesium is a soft, silvery-golden alkali metal .
Which compound is used to make asphalt? a saturated hydrocarbon that has more than 35 carbons in its chain a saturated hydrocarbon that has between 17 and 35 carbons in its chain a saturated hydrocarbon that has between 5 and 8 carbons in its chain a saturated hydrocarbon that has between 1 and 2 carbons in its chain
Answer:
answer is A. a saturated hydrocarbon that has more than 35 carbons in its chain
Explanation:
edge in 2020 :)
The compound which is used to make asphalt is a saturated hydrocarbon that has more than 35 carbons in its chain.
What is asphalt?Asphalt is also known by the name of bitumen, its appearance is sticky and black or present in semi solid form of petroleum.
Asphalt is a kind of hydrocarbon means mainly formed by the composition of carbon atoms and hydrogen atoms, but in very trace quantity amount of nitrogen, sulfur and other hateroatoms are also present. It is present in complex form means both saturated and unsaturated or aliphatic and aromatic compounds are present in it. It is formed by the long carbon chain which has a number of Carbon atoms around 150.
Hence it is a saturated hydrocarbon that has more than 35 carbons.
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hi :) how to test if a solution is neutral?
Explanation:
solution is neutral because it added water and water is neutral solution
The products of a reaction are NaCl and H2O. What does the law of conservation of matter reveal about the reactants in the reaction? A. At least some of the reactants will include NaCl and H2O. B. The reactants will contain only Na, Cl, O, and H in some amounts. C. Na, Cl, O, H, and three other elements were the reactant elements. D. The reactants will have one Na, one Cl, one O, and two H atoms.
Answer:
D
Explanation:
total mass should be equal on both sides
it's a double do displacement reaction
HCl + NaOH --> NaCl + H2O
Which best explains why a firework being ignited is an example of an exothermic reaction and not an endothermic reaction?
A)The fireworks produce colors.
B)The fireworks give off heat.
C)Igniting the fireworks requires energy
D)Igniting the fireworks makes an odor.
Answer:B
Explanation:
TOOK DA TEST
As the firework releases heat, it is considered as exothermic reaction. The correct option is B.
What is exothermic reaction?An exothermic reaction is one in which the energy required to break bonds in the reactants is less than the energy released when new bonds form in the products.
Energy is constantly released during an exothermic reaction, often in the form of heat. Exothermic reactions characterize all combustion reactions.
Endothermic reactions are chemical reactions that produce products by absorbing heat energy from their surroundings.
Exothermic reactions are important in forensic science, particularly in the investigation of fires and explosions.
Endothermic refers to a chemical reaction that requires heat and results in cooling of the surroundings.
As fireworks are releasing energy in the form of heat, it can be called as an exothermic reaction.
Thus, the correct option is B.
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Which statement describes an effect of large asteroid and comet impacts?
Answer:
They could cause an organism and population and species to die.
Explanation:
If the asteroid hits on ground, there would be a colossal amount of dust thrown up into the atmosphere and our world. If it hits in water and ocean , then there would be a huge surge in water vapor in the atmosphere. This would result in an increase in rain resulting in landslides and mudslides
The enthalpy of formation of water is –285.8 kJ/mol. What can be inferred from this statement? The enthalpy of the products is equal to the enthalpy of the reactants. Heat is absorbed during the process. Heat is released during the process. The enthalpy of the products is more than the enthalpy of the reactants.
Answer:
Heat is released during the process.
Explanation:
From the information provided in question, the enthalpy of formation of water is –285.8 kJ/mol. This is simply an exothermic reaction.
The negative sign indicates that the enthalphy of the reactants is more than the enthalphy of the products and as such, heat is released from the system into the surroundings.
The enthalpy of formation of water is –285.8 kJ/mol means that heat is released during the process.
What is enthalpy of formation of a substance?The enthalpy of formation of a substance is the amount of heat given off or absorbed when one mole of a substance is formed from the reactants.
A positive value for enthalpy means the reaction is endothermic while a negative value for enthalpy means the reaction is endothermic.
Therefore, the enthalpy of formation of water is –285.8 kJ/mol means that the reaction is exothermic and heat is released during the process.
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how many bonds are present in NCl3
Indicate the bonding type in each of the following compound CsBr
Answer:
Ionic bonding
Explanation:
A bond between a metal and a non-metal is an ionic bond and Since, Cesium is a metal and Bromine is a non-metal, It form the bond called Ionic Bond.
4. Which change to a DNA molecule would have the least effect on an organism?
A: an addition to a base sequence at the beginning of a gene
B: a substitution in a base sequence that does not code for a protein
C: a substitution that creates a "stop" code in the middle of a gene
D: a deletion from a base sequence in the middle of a gene
Answer: Change in a single nitrogen base in the DNA sequence will not have any significant effect on the organism.
So A
Explanation:
This is known as point mutation and it does not have any significant change in the protein and it is least harmful type of DNA mutation.