Calculate the molar mass of Na2CO3. What percentage (% comp) of Na2CO3 is composed to sodium?
Answer:
43.40%
Explanation:
How many moles of Al2o3 will be formed when 27 grams of AL reacts completely with O2?
Answer:
0.52 mole
Explanation:
How many moles of Al2O3 will be formed when 27 grams of Al reacts with O2? Hence 0.78 mole of oygen react with Aluminium to give 0.52 mole of Al2O3.
Indicate the compartment (A or B) that will increase in volume for each of the following pairs of solutions separated by a semi- permeable membrane: A B a. 20% (m/v) starch b. 10% (m/v) albumin c. 0.5% (m/v) sucrose 10% (m/v) starch 2% (m/v) albumin 5% (m/v) sucrose
Based on the concentration of the solutions, the increase in volume is as follows:
the volume of the 20% (m/v) starch increasesthe volume of the 10% (m/v) albumin increasesthe volume of the 5% (m/v) sucrose increasesWhat is osmosis?Osmosis is the movement of water molecules from a region of low solute concentration to a region of high solute concentration through a semipermeable membrane.
The movement of water molecules in the solution pairs is as follows:
the volume of the 20% (m/v) starch increases because water moves in from the 10% (m/v) starch solution.the volume of the 10% (m/v) albumin increases because water moves in from the 2% (m/v) albuminthe volume of the 5% (m/v) sucrose increases because water moves in from the 0.5% (m/v) sucrose.Therefore, the increase in volume depends on the concentration ofvthe solutions.
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Urgent, please walk me through this
Answer:
H
Explanation:
1. A sample of methane gas collected at a pressure of 1.28 atm and a temperature of 29.0 degrees Celsius is found to occupy a volume of 27.6 liters. How many moles of CH4CH4 gas are in thesample?
Moles be n
[tex]\\ \rm\Rrightarrow PV=nRT[/tex]
[tex]\\ \rm\Rrightarrow n=\dfrac{PV}{RT}[/tex]
[tex]\\ \rm\Rrightarrow n=\dfrac{1.28(27.6)}{0.0821(302)}[/tex]
[tex]\\ \rm\Rrightarrow n=\dfrac{35.3}{24.8}[/tex]
[tex]\\ \rm\Rrightarrow n=1.42mol[/tex]
The number of moles of methane gas occupies in the given volume and pressure is 1.426 moles. It can be calculated using ideal gas law.
What is ideal gas law?Ideal gas law relates the parameters temperature, pressure, volume and number of moles of a gas by the equation given below:
PV = nRT.
Where, R is the universal gas constant equal to 0.082 L atm /(K .mol). This law is a combination of Boyle's law, Charles's law and Avogadro's law.
It is given that the pressure and volume of the gas is 1.28 atm and 27.6 liter respectively. Temperature is 29 degree celsius or 302 kelvin. Using these values the number of moles of methane gas is calculated as follows:
PV = nRT
n = PV/RT
Number of moles of methane n = (1.28 atm × 27.6 L) / ( 0.082 L atm /(K .mol) × 302 K )
= 1.426 moles.
Hence, the number of moles of methane gas in the given system is 1.426 moles.
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PLEASE HELP!!
The bond energy of O-H is 464 kJ/mol. What is the total bond energy of 2OH?
The total bond energy of 2OH bond is 928 kJ/mol
Bond energyBond energy is the energy needed to break or form bonds. They are measured in kilojoule per mole (kJ/mol).
Total bond energy of 2OH
Since we are given that the bond energy of O-H is 464 kJ/mol and we require the total bond energy of 2OH. In 2OH, the are two O-H bonds.
So, the bond energy of the two O-H bonds will be twice that of the single O-H bond.
So bond energy of 2OH = 2 × bond energy of O-H = 2 × 464 kJ/mol
= 928 kJ/mol
So, the total bond energy of 2OH bond is 928 kJ/mol
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A chemist determined by measurements that 0.085 moles of silver participated in a chemical reaction. Calculate the mass of silver that participated in the chemical reaction. Be sure your answer has the correct number of significant digits.
Answer:
9.16895 grams
Explanation:
cuz u have number of moles of silver which = 0.085
so u must know that molar mass of silver =107.87 g/mol
so the mass of silver = number of moles × molar mass =0.085×107.87= 9.16895 grams
What are the three RID factors?
Answer:
recognition, intrusion and distraction
Explanation:
20 points help with this chemistry question please I will be soo grateful.
A sample of gas starts at 1.00 atm, 0.00 degrees Celsius, and 30.0 mL. What is the volume if the temperature increases to 27.0 degrees Celsius and the pressure increases to 2 atm?
A. 65.9 mL
B. 54.6 mL
C. 16.5 mL
D. 13.7 mL
Explanation:
[tex] \frac{p1v1}{t1} = \frac{p2v2}{t2} [/tex]
1 × 30/273 = 2 × V2/300
V2=300×30/2×273
V2= 16.5 ml
Explain why potassium atom would not bond with a calcium atom.
Potassium atom would not bond with a calcium atom because two metals because they are not capable of accepting electrons.
What is a Metal?This is referred to as a substance with high electrical conductivity, luster, and malleability, which readily loses electrons to form positive ions known as cations.
The formation of chemical bonds in a reaction requires a change in electron distribution which can only be possible when one of the elements participating in the reaction can accept electrons and is therefore the reason why two metals such as potassium and calcium atom can't form a reaction but two non metals can.
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N2(g) + 3H2(g) → 2NH3(g); ΔH = -91.8 kJ Consider the thermochemical equation for the synthesis of ammonia. Which statement is true? A) Negative enthalpy indicates that energy is required to complete the reaction. B) Negative enthalpy indicates a decrease in potential energy and an endothermic reaction. C) Enthalpy is negative indicating that energy is released so this is an exothermic reaction. D) Enthalpy is negative indicating that there is an energy deficit; the reaction is incomplete.
The energy of -91.8 kJ in the reaction equation shows that energy is released so this is an exothermic reaction.
What is a thermochemical equation?A thermochemical equation is one which just does not only show the reactants and products but also shows the energy absorbed or emitted in the reaction.
We can see from the thermochemical equation; N2(g) + 3H2(g) → 2NH3(g); ΔH = -91.8 kJ that the negative enthalpy implies that energy is released so this is an exothermic reaction.
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At which part of its orbit is the planet traveling at the slowest speed? :
A diagram showing the orbit of a planet around the sun. The planet passes through A to B, where it is farthest from the sun; the planet then passes through C to D, where it is closest to the sun.
A
B
C
D
Answer:
B. Because the planet travels slowly when it is far away from the sun
If the phosphorus is present as phosphate ion (PO43-), how many moles of PO43- are present in 5.00 g of the 15-30-15 fertilizer?
What happens when the wind hits a barrier, such as a hill or a mountain?
explain.
OH AND I GIVE BRAINLIST
FOR THE BEST ANSWER.
Answer:
The wind will keep pushing against it and it will go around and above it. You can test this by holding a pot and a hairdryer. The air will go around the pot so the wind will do the same. The wind will go aound the object blocking its path by going to the side or up.
Explanation:
The wind will keep pushing against it and it will go around and above it. You can test this by holding a pot and a hairdryer. The air will go around the pot so the wind will do the same. The wind will go aound the object blocking its path by going to the side or up.
THEY ARE CALLED PREVAILING WINDS!!!!
Have an amazing day!!!
PLEASE RATE AND MARK BRAINLIEST!!!!
Answer: 1. D. It warms the air masses.
2. D. The air moves from high to low pressure systems.
3. B. It is pushed upwards and out.
4. B. uneven rainfall
Hope this helped! Brainliest would be appreciated. :)
A 35.3g of element M is reacted with Nitrogen to produce 43.5g of compound M3N2. What is the molar mass of the Element?
Balanced chemical reaction
[tex]\\ \rm{:}\dashrightarrow 3M+N_2\longrightarrow M_3N_2[/tex]
3 mol weighs 35.3gMolar mass=35.3/3=11.77g/molWhich of the following is an electrolyte?
a)AgBr
b)SrSO4
c)NaCl
d)CaCO3
Answer: A
Explanation:
Which choice explains a use of a Venn diagram?
graphs sizes and amounts using bars
illustrates similarities and sizes only
illustrates ways things are similar and different
charts numbers using shapes
Answer:
illustrates ways things are similar and different
Explanation:
Answer:
illustrates ways things are similar and different
Much of earth surface is covered by groundwater, body of fresh water, land areas, or bodies of salt water?
Report your answer using appropriate number of significant figures. Moels of water a. 9.52 x 1026 molecules ____mol
it has to be b
Explanation:
bc the 4th power to 5 is 2
A 50.0 mL sample of 12.0 M HCl is diluted to 200 mL. What is true about the diluted solution?
The concentration of the solution reduces and the number of moles of solute isn't affected.
Data;
V1 = 50mLC1 = 12.0MV2 = 200mLC2 = ?Facts about the diluted solution1. When the solution is diluted, the concentration changes and this time, the concentration reduces.
Using dilution formula
[tex]c_1 v_1 = c_2 v_2\\12 * 50 = c_2 * 200\\c_2 = \frac{600}{200} \\c_2 = 3M[/tex]
The concentration of the solution reduces.
2. The number of moles remains the same.
When a solution is diluted, the number of moles remains the same because there's no change in the mass of the solute.
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a.
Elements in the same group have similar chemical properties because
A.their atoms are about the same size.
b. they have a similar atomic mass.
c. they have the same number of valence electrons.
d. they have a diagonal relationship.
Answer:
c. they have the same number of valence electrons
What two things interact to affect development of color in some instances?
Answer:The colour and distribution of the organism's biochromes
Explanation:
The colour and distribution of the organism's biochromes (pigments), particularly the relative location of differently coloured areas; the shape, posture, position, and movement of the organism; and the quality and quantity of light striking the organism
Why critical thinking is important especially for chemists?
Answer:
Because chemists need to think outside the box for what they do, in other words, "science is not always black and white" which means science has color to it or many different aspects some of those which are not yet discovered and needs critical thinking chemists to figure out and discover.
Explanation:
(this was all in my own words and not actually cut and Paiste ○|￣|_ =3)
helppppppppppp plssssssssa
[tex]\Large \text{1)}[/tex]
[tex]\textbf{Use the formula and substitute the values}[/tex]
[tex]\displaystyle 0.3\ mol/L = \frac{n \ mol}{10 \times 10^{-3}\ L}[/tex]
[tex]\textbf{Solve for the number of moles}[/tex]
[tex]n = 0.003\ mol[/tex]
[tex]\textbf{Calculate final volume }[/tex]
[tex]40+10=50\ mL[/tex]
[tex]\textbf{Number of moles remains same. Solve for concentration}[/tex]
[tex]\displaystyle C=\frac{0.003\ mol}{50 \times 10^{-3}\ L} =0.06\ mol/L[/tex]
[tex]\Large \text{2)}[/tex]
[tex]\displaystyle DF=\frac{V_f}{V_i}[/tex]
[tex]\displaystyle DF=\frac{50}{10}=5[/tex]
Which is a fossil fuel? A. Biomass B. Wind C. Nuclear D. Petroleum
Answer:
(D) petroleum
Explanation:
because as we know that petroleum is obtain from the sea bed,within the remains of animals and plants which lived millions of year ago......
How much energy is produced in each stage cellular respiration and how is it used?
Answer:
Some of the energy from the electrons is used to pump hydrogen ions across the membrane, creating an electrochemical gradient that drives the synthesis of many more molecules of ATP. In all three stages of cellular respiration combined, as many as 38 molecules of ATP are produced from just one molecule of glucose.
Explanation:
H2O2(aq)+ClO4−(aq)→ClO2−(aq)+O2(g)
Express your answer as a net ionic equation including phases in basic solution
Answer:
H
2
O
2
(aq)+ClO
4
−
(aq)⟶O
2
(g)+ClO
2
−
(aq)
All atoms except H and O are balanced.
The oxidation number of Cl changes from 7 to 3. The change in the oxidation number is 4.
The oxidation number of O changes from -1 to 0. The change in oxidation number per O atom is 1.
Total change in the oxidation number for 2 oxygen atoms is 2.
To balance the increase in oxidation number with decrease in the oxidation number, multiply H
2
O
2
and O
2
with coefficients 2.
2H
2
O
2
(aq)+ClO
4
−
(aq)⟶2O
2
(g)+ClO
2
−
(aq)
To balance O atoms, add 2 water molecules on RHS.
2H
2
O
2
(aq)+ClO
4
−
(aq)⟶2O
2
(g)+ClO
2
−
(aq)+2H
2
O(l)
The oxygen atoms are already balanced.
This is the balanced chemical equation
Movement of Ocean water
Choose ALL that apply
A. none of the choices
B. Surface water at the poles is dense because of low temperatures and high salinity.
C. Differences in the density of seawater cause it to move.
D. This water sinks and moves toward the equator where it replaces less dense, warm water.
Answer:
I would go with
B. Surface water at the poles is dense because of low temperatures and high salinity.
i could be wrong tho.
Explanation:
aldehydes plus potassium permanganate with explanation
[tex] \large \sf \: answer[/tex]
You can identify the aldehyde from acidic potassium permanganate. Purple colour of acidic potassium permanganate is changed to colourless because aldehyde is oxidized by acidic potassium permanganate.
What are the correct coefficients in order for the equation to be balanced ?
Answer:
1. 2
2. 2
3. 3
Explanation:
That's my answer