Answer:
1
Explanation:
outershell atoms of an element are also known as valency of that element
so the valency and number of elctron in the outershell of a sodium atom is +1.
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How many miles of sodium chloride are produced when 2.9 grams of sodium iodide reacts? __ mol NaCl
2 Nal(s) + Cl2(g) = 2 NaCl(s) + l2(g)
**Report your answer to the correct number of significant digits!
Answer: I am trying 0.88 if it is correct then I will edit this to say that!
Explanation:
What is the volume of 902.0 g of C₂H₄ gas at STP
Answer:
Volume = 722.1 L
Explanation:
Given data:
Mass of gas = 902.0 g
Temperature = standard = 273.15 K
Pressure = standard = 1 atm
Volume of gas = ?
Solution:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
Now we will calculate the number of moles of C₂H₄.
Number of moles = mass/molar mass
Number of moles = 902.0 g/ 28.05 g/mol
Number of moles = 32.2 mol
Volume of gas:
PV = nRT
1 atm ×V = 32.2 mol × 0.0821 atm.L/ mol.K × 273.15 K
V = 722.1 atm.L/1 atm
V = 722.1 L
can someone please help me out with this ? very much would appreciate the help!
Answer:
one is more dense
Explanation:
density = mass/volume
Vinegar, CH3COOH can be used to remove limescale deposits.
Describe how vinegar can remove limescale deposits with the aid of a
balanced equation.
The reaction between acids in acetic acid in vinegar reacts with bases of calcium carbonate to form calcium acetate salts
Further explanationCalcium can form deposits on the surface of equipment in contact with water in the form of CaCO₃
vinegar which contains acetic acid can break the bonds between Calcium and Carbonate that form calcium acetate
CaCO₃ + 2CH₃COOH = Ca(CH₃COO)₂ + H₂CO₃
CaCO₃ + 2CH₃COOH = Ca(CH₃COO)₂ + H₂O + CO₂
Precise measurements are highly reproducible, even if the
measurements are not near the correct value.
TRUE
FALSE
True because you can be precise with the same measurements but they can be not the correct area so
it should be TRUE
13. How many moles of sodium hydroxide are needed to neutralize 50grams of sulfuric acid?
2NaOH H2SO4 → Na2SO4 + 2H2O
Answer:
1.02mole
Explanation:
The reaction equation is given as:
2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O
Given:
Mass of H₂SO₄ = 50g
Unknown:
Number of moles of NaOH = ?
Solution:
To solve this problem, we first find the number of moles of the acid given;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of H₂SO₄ = 2(1) + 32 + 4(16) = 98g/mol
Now;
Number of moles = [tex]\frac{50}{98}[/tex] = 0.51mole
From the balanced reaction equation:
1 mole of H₂SO₄ will be neutralized by 2 mole of NaOH
0.51 mole of H₂SO₄ will be neutralized by 2 x 0.51 = 1.02mole of NaOH
How many (s) sublevels are present in calcium atom (Ca)?
Answer:
nineteen atoms
Explanation:
nineteen atoms
PLS ANSWER FAST THANK YOUU
Answer:
c
Explanation:
Non-malleable, less dense, insulators and brittle describe what physical property group?
metals
metalloids
non-metals
transition metals
metalloids is the answer
Answer: non-metals
Explanation:
0.817 grams of an unknown gas occupies 1.25 L at 27.0 C and a pressure of 765
mm Hg. Is the gas most likely methane (CH 4 ), ethane (C 2 H 6 ), propane or butane?
Show work to support your answer.
The gas is most likely methane (CH₄)
Further explanationIn general, the gas equation can be written
[tex]\large{\boxed{\bold{PV=nRT}}}[/tex]
where
P = pressure, atm
V = volume, liter
n = number of moles
R = gas constant = 0.08205 l.atm / mol K
T = temperature, Kelvin
[tex]\tt PV=\dfrac{mass}{M}RT\\\\M=\dfrac{mRT}{PV}=\dfrac{0.817\times 0.082\times 300}{1,00658\times 1.25}=15.97\approx=16[/tex]
So the gas is most likely methane (CH₄ )
A cheetah is faster than a cougar, which has greater momentum if the big cats are the same mass
Answer:
cougar.
explanation:
which is has a greater momentum a cheetah with a mass of about 74 kg and a running speed of up to 31 m/s. the cougar's top running speed ranges between 40 to 50 mph (64 to 80 km/h)
Which of the following about sodium atoms
(Na) is NOT correct?
1. All neutral sodium atoms have 11 protons
and 11 electrons.
2. All sodium atoms have the atomic number
11.
3. All sodium atoms have the same number
of protons.
4. All sodium atoms have 11 neutrons.
5. All atoms with atomic number 11 are
sodium atoms.
Answer:
1 is not correct ......
All neutral sodium atoms have 11 protons and 11 electrons is about sodium atoms (Na) is not correct. Therefore, option 1 is correct.
Which are neutral atoms?When an atom has the same number of electrons and protons, it has the same number of negative (electrons) and positive (protons) electric charges (the protons).
As a result, the total electric charge of the atom is zero, and it is said to be neutral. As a result, all elements in the periodic table have neutral atoms.
The sodium atom contains 11 electrons. As sodium atom loses one electron to form sodium ion, sodium ion has ten electrons. Only sodium atoms have a strong reaction with water, whereas sodium ions do not.
Thus, All neutral sodium atoms have 11 protons and 11 electrons is about sodium atoms (Na) is not correct, option 1 is correct.
To learn more about the neutral atom, follow the link;
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Calculate the number of sulfate ions in 41.65 g of aluminum sulfate.
The number of sulfate ions : 2.2 x 10²³
Further explanationReaction
Al₂(SO₄)₃⇒2Al³⁺+3SO₄²⁻
mol Al₂(SO₄)₃(MW=342,15 g/mol) :
[tex]\tt \dfrac{41.65}{342.15}=0.122[/tex]
mol of sulfate ions (SO₄²⁻)
[tex]\tt 3\times 0.122=0.366[/tex]
1 mol = 6.02 x 10²³ particles (ions, molecules, atoms), so for 0.366 mol :
[tex]\tt 0.366\times 6.02\times 10^{23}=2.20\times 10^{23}[/tex]
What is the value of delta Hrxn for this equation:
NH3(g)+2O2(g)⟶HNO3(g)+H2O(g)
Based on the molar bond enthalpies:
N−H 390
O−O 142
O=O 502
O−H. 464
N−O 201
Answer:
The ΔHrxn for the above equation = 179 kJ/mol
Explanation:
The reaction bond enthalpies are for the reactant;
3 × N-H = 3 × 390 = 1,170 kJ/mol
2 × O=O = 2 × 502 = 1004 kJ/mol
The reaction bond enthalpies are for the product;
3 × N-O = 3 × 201 = 603 kJ/mol
3 × O-H = 3 × 464 = 1,392 kJ/mol
The ΔHrxn for the above equation is therefore;
ΔHrxn = 1,170 + 1,004 - (603 + 1,392) = 179 kJ/mol
The value of [tex]\rm \Delta H_r_x_n[/tex] of the reaction can be 179 kJ/mol.
[tex]\rm \Delta H_r_x_n[/tex] of the reaction can be given by the change in the energy for the bond formation and the energy for the dissociation of the bonds.
The energy for the dissociation of bonds are :
3 N-H bonds = 3 [tex]\times[/tex] 390
3 N-H bonds = 1170 kJ/mol
2 O-O bonds = 2 [tex]\times[/tex] 142
2 O-O bonds = 1004 kJ/ mol.
The total energy for the dissociation of bonds = 1170 + 1004 kJ/mol
The total energy for the dissociation of bonds = 2174 kJ/mol
The energy for the formation of bonds are :
3 N-O bonds = 3 [tex]\times[/tex] 201
3 N-O bonds = 603 kJ/mol
3 O-H bonds = 3 [tex]\times[/tex] 464
3 O-H bonds = 1392 kJ/mol
The total energy for the formation of bonds = 603 + 1392
The total energy for the formation of bonds = 1995 kJ/mol
[tex]\rm \Delta H_r_x_n[/tex] of the reaction = energy for the dissociation of bonds - energy for the formation of bonds
[tex]\rm \Delta H_r_x_n[/tex] of the reaction = 2174 - 1995 kJ/mol
[tex]\rm \Delta H_r_x_n[/tex] of the reaction = 179 kJ/mol.
The value of [tex]\rm \Delta H_r_x_n[/tex] of the reaction can be 179 kJ/mol.
For more information about the [tex]\rm \Delta H_r_x_n[/tex] of the reaction. refer to the link:
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Which of the following quantum numbers describes a d-orbital in the fourth energy level?
a. n = 4, l = 0, m = 0
b. n = 3, l = 1, m = 0
c. n = 3, l = -1, m = 0
d. n = 4, l = 2, m = 0
Answer:
d. n = 4, l = 2, m = 0
Explanation:
A d-orbital in the fourth energy level can only be represented by n = 4, l = 2, m = 0.
n is the principal quantum number(n) which signifies the energy level, here it is 4;
l is the azimuthal quantum number or l which signifies the shape of the subshell, it takes a value of n - 1, 0,1,2 or 3
m is the magnetic quantum number(m) which can be -2, -1, 0, 1 , 2
So, the right and fitting solution is n = 4, l = 2, m = 0
Select the correct answer
Because of its size, adult blue whale has few natural predators. It’s diet consists exclusively of tiny creatures called krill. These whales can dive to great depths but must come to the surface regularly for air. From this information, what is one limiting factor for population of blue whales?
A. Availability of krill
B. Available sunlight for photosynthesis
C. Oxygen in water
D. Salinity of water
E. Visibility in water
Answer:
A
Explanation:
The correct answer would be the availability of krill.
A limiting factor is a substance or condition whose presence/absence can prevent a population from reaching its potential. Limiting factors can be biotic (living) or abiotic (non-living). Biotic factor includes the presence of competitive organisms in a population while abiotic factor includes food.
In the case of the blue whale, its diet is krill. Hence, its survival is largely dependent on the availability of krill. Otherwise, the blue whale might starve. Therefore, the availability of krill is a limiting factor for the population of whales.
The correct option is A.
30.5 g of sodium metal reacts with chlorine gas to produce sodium chloride. How much (in grams) chlorine gas must react with this amount of sodium
Answer:
Mass of chlorine = 47.22 g
Explanation:
Given data:
Mass of sodium = 30.5 g
Mass of chlorine= ?
Solution:
Chemical equation:
2Na + Cl₂ → 2NaCl
Number of moles of Na:
Number of moles = mass/molar mass
Number of moles = 30.5g/ 23 g/mol
Number of moles = 1.33 mol
Now we will compare the moles of Cl ₂ with Na from balance chemical equation.
Na : Cl ₂
2 : 1
1.33 : 1/2×1.33 = 0.665 mol
Mass of chlorine gas:
Mass = number of moles × molar mass
Mass = 0.665 mol × 71 g/mol
Mass = 47.22 g
When you look at the absorption spectra of cranberry juice and apple juice, what colors/parts of the visible spectrum are absorbed?
Discuss how the colors/parts that are not absorbed contribute to the colors of cranberry juice and apple juice.
Looking at the absorption Spectra of cranberry juice and apple juice the color and part of the visible spectrum that are absorbed as well as how the colors that are not absorbed contributed to the the colors of the cranberry juice and apple juice are;
When the light actually hits on a surface,it is only a part of it that is reflected to the eyes whereas the rest of the spectrum is then absorbed by the object.
However,if the red wavelength is reflected,you will see the red color,but if all the spectrums are absorbed,you will see the black color,if then all the spectrums is reflected,you will see the white color.
When the light hits the surface, just a part will be reflected in the eyes of the person.
From the complete information, when an individual looks at the absorption spectra of cranberry juice and apple juice, just a part will be seen.
When the light hits the surface, there'll be a reflection in the eyes of the person as just a part will be reflected. The rest of the spectrum will be absorbed by the object.
Also, if the red wavelength is reflected, then one will see the red color. When all the spectrum is absorbed, one will see the black color. Lastly, when all the spectrum is reflected, one will see the white color.
Read related link on:
https://brainly.com/question/17231700
The bottom number on the periodic table is called?
Answer:
Atomic mass
Explanation:
Atomic mass ===>Mole weight ....the weight in grams of one mole of the element
Which best explains the statement "It has no definite volume”?
Its atoms can widely spread out.
Its atoms stay closely packed.
It’s highly viscous.
It’s highly crystalline.
Answer:
D
Explanation:
nobody answers anymore but it's worth a shot, i will give branliest tho.
1. when Sodium reacts violently with water is it a physical or chemical change?
2. Ethanol is clear, is that a physical or chemical change?
a simple definition of cells
Answer:
Cells are the basic structural and functional unit of life.
The gene for brown eyes is dominant. What is needed in order for a person to have brown eyes?
Write the Electron Configuration of an atom with 10 electrons:
Explanation:
Neon is the tenth element with a total of 10 electrons. ... Therefore the Ne electron configuration will be 1s22s22p6. Because the second energy level (2s22p6) has eight electrons Neon has an octet and has a full outer shell. It is therefore a Nobel Gas.
Which element is in the noble gas family? A. Iodine (I)
B. Nitrogen (N)
C. Radon (Rn)
D. Oxygen (O)
Answer:
Radon
Explanation:
:
Answer:
c. Radon (Rn)
Explanation:
hope this can help
11. Apply Concepts You weigh a spoonful of baking soda and 10 mL of vinegar. Then you mix them together. You see that there is quite a bit of fizzing. You weigh the products after the reaction and find there is mass missing. Does the loss of mass disprove the law of conservation of mass? If not, how could you prove it? Please help I have to turn this in before midnight on canvas before its locked.
Answer:
The loss of mass does not disprove the law of conservation of mass because the evaporated fizz goes into the air. Same with lakes when there is a big body of water, but it slowly starts to look like a smaller body of water. This is because the water evaporates, but the mass is not destroyed it is just being coverted into gas.
Explanation:
What is the male sex cell that results from meiosis?
Answer: B) Sperm
Explanation: For lazy gang wya Lol
How are weathering and erosion the same?
a
Both move sediment from one place to another.
b
Both break down rocks into smaller pieces.
c
Both change Earth's surface.
d
Both leave sediment in new places
I need help please and give me an explanation
Which of the following statements is true concerning what happens when cold milk is poured into hot coffee?
The cold milk transfers its cold to the coffee, cooling the coffee down.
The cold milk transfers its heat to the coffee, warming the coffee up.
The warm coffee absorbs the cold from the milk, cooling the coffee down.
The warm coffee transfers its heat to the milk, cooling the coffee down.
Answer:
The cold milk transfers its cold to the coffee, cooling the coffee down.
Hope This Helps!
Answer:
The cold milk transfers its cold to the coffee, cooling the coffee down.
Explanation: