Volume HNO₃ : 51.4 ml
Mass CO₂ : 0.17 g
Further explanationReaction
Na₂CO₃ + 2 HNO₃ ⇒ 2 NaNO₃ + CO₂ + H₂O
V Na₂CO₃ = 35.7 ml
M Na₂CO₃ = 0.108
mol Na₂CO₃ :
[tex]\tt 35.7\times 0.108=3.8556~mlmol[/tex]
mol ratio Na₂CO₃ : HNO₃ = 1 : 2
mol HNO₃ :
[tex]\tt \dfrac{2}{1}\times 3.8556=7.71~mlmol[/tex]
Volume HNO₃ :
[tex]\tt mol=n=M\times V\\\\V=\dfrac{n}{M}=\dfrac{7.71}{0.15}=51.4~ml[/tex]
mol CO₂ = mol Na₂CO₃ = 3.8556 mlmol=0.00386 mol
mass CO₂(MW=44 g/mol) :
[tex]\tt 0.00386\times 44=0.17~g[/tex]
1. Find the number of protons, neutrons, electrons and electronic structure of flourine 919F.
2. Write the chemical formula of following compound.
Magnesium hydroxide
3. Balance the following equation
_H2 + _O2 --------> __H2O
1. ₉¹⁹F
2. Mg(OH)₂
3. 2H₂ + O₂ ⇒ 2H₂O
Further explanation1. Fluorine, atomic number : 9 , mass number = 19
Symbol : ₉¹⁹F
protons=electrons=atomic number = 9
neutrons = mass number - atomic mass
[tex]\tt n=19-9=10[/tex]
Configuration : [He] 2s² 2p⁵
2. Magnesium hydroxide is an ionic compound and is a strong base consisting of 2 ions:
Positive ion: Magnesium: Mg²⁺
negative ion: Hydroxide: OH⁻
The charges of the two are crossed, so that the compound becomes:
Mg(OH)₂
3. Reaction :
H₂ + O₂ --------> H₂O
give coefficient :
aH₂ + bO₂ --------> H₂O
H, left = 2a, right 2⇒2a=2⇒a=1
O, left = 2b, right 1⇒2b=1⇒b=0.5
Reaction becomes :
H₂ + 0.5O₂ --------> H₂O x 2
2H₂ + O₂ --------> 2H₂O
SOMEONE HELP ME PLEASE ILL GIVE BRAINLY
why is oiling done time and again in a sewing machine
Answer:
Oiling is done on a regular basis to sewing Machine because in the machine there are lots of machinery parts i.e. wheels and axels, etc. which are in continuous use and they possess so much frictional force between them that wear tear may be observed in those parts.
For Frictionless sewing
Which statement applies only to electric force insted of electric and magnetic forces
Answer:
If the options are
A. It can push objects apart
B. It can pull objects together
C. It acts between charged particles
D. It acts between objects that do not touch
I'm pretty sure it would be C.
Sry if wrong but have nice day! <3
Please help me! It would be amazinggg if you CANNN!!
Answer:
it is number 2
Explanation:
hope this helps it is number 11
What is formed by the hydrolysis of Starch?
Answer:
soluble starch, maltose and various dextrins.
Explanation:
C-12 is an isotope of Carbon; what is its atomic number and its atomic mass number?
Answer:
Explanation:
Given isotope;
C - 12
Unknown:
Atomic number = ?
Atomic mass = ?
Solution:
Isotopes of an element have the same electronic configuration but only differ in their masses. They have the same atomic number but different mass numbers due to the differences in the number of neutrons in their various nuclei.
For carbon; atomic number = 6
Atomic mass of this isotope = 12
The atomic number is the number of protons
Atomic mass is the number of protons and neutrons
Why are ocean currents important to coastal regions?
Answer:
Warm and cold ocean currents can affect the climate of an area along the coast if the winds blow in from the ocean. Warm ocean currents heat the air above the water and carry the warm air to the land, increasing the temperature of the coastal region.
Explanation:
Ocean currents are important to coastal regions for a number of reasons.
What are the importance?Distribute heat. Ocean currents distribute heat around the globe, which helps to moderate the climate in coastal regions. For example, the Gulf Stream brings warm water from the Gulf of Mexico to the coasts of Europe, which helps to keep Europe's climate warmer than it would be otherwise.
Transport nutrients. Ocean currents transport nutrients from the ocean's depths to the surface, which supports marine life. For example, the California Current brings nutrients from the deep ocean to the surface, which supports a rich marine ecosystem off the coast of California.
Diversify marine life. Ocean currents help to diversify marine life by transporting different species to different parts of the ocean. For example, the Kuroshio Current brings warm water from the western Pacific Ocean to the eastern Pacific Ocean, which has helped to diversify the marine life in this region.
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What is the difference between carbon-12, carbon-13, and carbon-14?
Answer:
Number of neutrons in the nucleus.
Explanation:
Mass number is protons plus neutrons. Protons do not change from isotope to isotope
(b) A atom T has atomic number 11 and mass number 23. How many (I) protons does it have?
Answer:
There are 11 protons in an atom T.
Explanation:
In chemistry, the scientific word for proton is also known as atomic number so the proton number will be 11.
Answer:
11
Explanation:
Sulfur dioxide is an atmospheric pollutant.
Sulfur dioxide pollution is reduced by reacting calcium oxide with sulfur dioxide to
produce calcium sulfite.
CaO + SO2 → CaSO3
7.00 g of calcium oxide reacts with an excess of sulfur dioxide.
Relative atomic masses (Ar): O = 16 S = 32 Ca = 40 Calculate the mass of calcium sulfite produced
The mass of calcium sulfite produced : 15 g
Further explanationA reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.
Reaction
CaO + SO₂ → CaSO₃
mol CaO (MW=56 g/mol)
[tex]\tt \dfrac{7}{56}=0.125[/tex]
Because sulfur dioxide is an excess, so mol CaSO₃ based on mol CaO
From the equation, mol ratio of mol CaSO₃ : mol CaO=1 : 1, so mol CaSO₃ :
[tex]\tt \dfrac{1}{1}\times 0.125=0.125[/tex]
mass CaSO₃ (MW=120 g/mol) :
[tex]\tt 0.125\times 120=15~g[/tex]
PLEASE HELP!!! I'LL MARK YOU BRAINIEST!!!
Answer:
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which of the following is an example of a model?
Answer:
U
Explanation:
UUUUUUUUUUUUUU
How is the pH of an acidic substance raised?
1) Dilute it.
2) freeze it.
3) Stir it.
4) Concentrate it.
Answer: 4) Concentrate it
Explanation:
01:44:12
Considering the temperature vs. time graph below, how does the temperature at the beginning of a change of state
compare with the temperature at the end of the change?
Temperature vs. Time
140
4
100
80
Temperature (°C)
3
30
40
20
2
0
20
Time (min)
The temperature is always lower
The temperature is always the same
The temperature is usually lower
The temperature is usually higher
Technetium-104 has a half-life of 18.0 minutes. How much of a 165.0 g sample remains after 36.0 minutes?
Answer:
41.25g
Explanation:
Given parameters:
Half-life of Technetium - 104 = 18minutes
Mass = 165g
Unknown:
Mass of sample remaining after 36minutes = ?
Solution:
The half-life of a radioactive element is the time taken for half of the element to decay;
Now;
Start First half life Second half-life
Time 0 18min 36min
Mass 165g 82.5g 41.25g
PLEASE HELP ME !
Electromagnetic waves will travel the SAME SPEED (speed of light) WITHIN a medium as it does WITHOUT a medium. Question 4 options: True False
Answer:
False
Explanation:
Emectromagnetic waves are slowed down by even the most transparent of mediums.
Which element is likely to be the best conductor of electricity?
Answer:
silver
Explanation:
The most electrically conductive element is silver, followed by copper and gold. Silver also has the highest thermal conductivity of any element and the highest light reflectance.
Answer:
A. copper
Explanation:
edge 2021
How many molecules/atoms of excess reactant will remain after the reaction is complete?
Answer:
Once you have identified the limiting reactant, you calculate how much of the other reactant it must have reacted with and subtract from the original amount.
Explanation:
1. Write the chemical equation.
2.Calculate the moles of product from the first reactant.
3.Calculate the moles of product from the second reactant.
4.Identify the limiting reactant and the excess reactant.
5.Calculate the mass of excess reactant used up.
6.Calculate the mass of unused excess reactant.
7.Calculate the mass of limiting reactant needed to react with the unused excess reactant.
Which of the following sets of forces acting on an object will result in the object moving?
5 Newtons Up and 5 Newtons Down
31 Newtons Left and 32 Newtons Right
0 Newtons Up and 0 Newtons Down
9 Newtons Left and 9 Newtons Right
Answer:
31 N left and 32 N right because
Explanation:
It’s the only one movement because when you subtract them there’s still 1 left
Which is more electrically negative? 1)C 2)P or 3)S
GUYS PLEASE HELP!!! :((
Answer:
3 sulphur is more electrically –
How do I graph these question
a. Explain why bicycle tires seem higher in the summer than in winter.
b. Explain why a can of soda pop explodes if left in the hot sun.
c. A rigid container filled with a gas is placed in ice (ex. nalgene bottle). What will happen to the pressure of the gas? What do you think will happen to the volume?
d. An infected tooth forms an abscess* that fills with gas. The abscess puts pressure on the nerve of the tooth, causing a toothache. While waiting to see a dentist, the person with the toothache tried to relieve the pain by treating the infected area with moist heat. Will this treatment help? Why or why not?
What is the total number of atoms in 0.20 mol of propanone, CH3COCH3?
NA = 6.022 x 1023
1.2 x 1022
1.2 x 1023
6.0 X 1024
6.0 x 1023
Answer:
1.2×10²³ atoms.
Explanation:
Data obtained from the question include:
Mole of propanone = 0.20 mole
Number of atoms of propanone =.?
From Avogadro's hypothesis, we understood that 1 mole of any substance contains 6.022×10²³ atoms.
This implies that 1 mole of propanone also contains 6.022×10²³ atoms.
Thus, we can obtain the number of atoms in 0.20 mole of propanone as illustrated below:
1 mole of propanone contains 6.022×10²³ atoms.
Therefore, 0.20 mole of propanone will contain = 0.2 × 6.022×10²³ = 1.2×10²³ atoms.
Thus, 0.20 mole of propanone contain
1.2×10²³ atoms.
The total number of atoms in 0.20 mole of propanone is 1.2×10²³, i.e. in given mole 1.2×10²³ atoms of propanone is present.
How many atoms present in one mole?In one mole of any substance 6.022 × 10²³ atoms of that substance will present, and this number is known by the name of Avogadro's number.
We have given moles of propanone = 0.20 mole
No. of atoms present in 0.20 mole of propanone = 0.20 × 6.022×10²³ = 1.2×10²³.
Hence, 1.2×10²³ atoms are present in given moles.
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A 2.80 g sample of Al reacts with 4.15 g sample of Cl2 according to the equation shown below.
2Al + 3Cl2 2AlCl3
What is the theoretical yield of AlCl3 in this reaction?
Answer:
Mass = 5.33 g
Explanation:
Given data:
Mass of Al = 2.80 g
Mass of Cl₂ = 4.15 g
Theoretical yield of AlCl₃ = ?
Solution:
Chemical equation:
2Al + 3Cl₂ → 2AlCl₃
Number of moles of Al:
Number of moles = mass/molar mass
Number of moles = 2.80 g/ 27 g/mol
Number of moles = 0.10 mol
Number of moles of Cl₂:
Number of moles = mass/molar mass
Number of moles = 4.15 g/71 g/mol
Number of moles = 0.06 mol
Now we will compare the moles of AlCl₃ with Al and Cl₂.
Cl₂ : AlCl₃
3 : 2
0.06 : 2/3×0.06 = 0.04
Al : AlCl₃
2 : 2
0.10 : 0.10
Number of moles of AlCl₃ produced by chlorine are less so it will be limiting reactant.
Mass of AlCl₃:Theoretical yield
Mass = number of moles ×molar mass
Mass = 0.04 mol × 133.34 g/mol
Mass = 5.33 g
5.33 grams is the theoretical yield of AlCl₃ in this reaction.
What is theoretical yield?Theoretical yield of any reaction tells about the accurate quantity of the product formed by the complete consumption of reactants.
Given chemical reaction is:
2Al + 3Cl₂ → 2AlCl₃
First we convert the mass of reactants into moles by using the formulas:
n = W/M, where
W = given mass
M = molar mass
Given mass of Al = 2.80 g
Moles of Al = 2.80/27 = 0.10 mole
Given mass of Cl₂ = 4.15 g
Moles of Cl₂ = 4.15/71 = 0.06 mole
From this calculation we conclude that Cl₂ is the limiting reagent, so the formation of product depends on Cl₂.
From the stoichiometry of the reaction, it is clear that:
3 moles of Cl₂ = produce 2 moles of AlCl₃
0.06 moles of Cl₂ = produce 2/3×0.06 = 0.04 moles of AlCl₃
Now we calculate the produced mass of AlCl₃ as:
W = 0.04mol × 133.34g/mol = 5.33g
Hence, 5.33g is the produced theoretical yield.
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is oxygen a necessary reactant for oxidation reaction
Answer:
Oxidation: A process in which an atom loses an electron and therefore increases its oxidation number. ... So oxidation reactions need not involve oxygen. This redox reaction is actually the sum of two separate half-reactions (a reduction half-reaction and an oxidation half-reaction).
Explanation:
Hope this helped!
Oxygen is not a necessary reactant for oxidation reaction.
In chemistry oxidation is called the chemical phenomenon in which an atom, molecule or ion loses one or more electrons, thus increasing its positive charge.
As oxygen is an element that usually accepts these electrons, this type of reaction was called oxidation reactions.
The element that grants the electrons is known as the reducing agent and it is the one that oxidizes.The oxidizing agent, on the other hand, stays with the electrons that the reducing agent releases.Most cases of oxidation involve oxygen, but it can also occur in its absence.Several substances are capable of oxidizing many chemical compounds, with the same and even greater ease than the oxygen [O2]; an example: ozone [O3].Ozone is a toxic agent as a consequence of its strong oxidizing power and is produced in cities by the action of sunlight on nitrogen dioxide, [NO2].Therefore, we can conclude that oxygen is not a necessary reactant for oxidation reaction.
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Examine the chemical reaction. What coefficient of O2 should be added so the number of atoms of oxygen is conserved on both sides of the reaction equation? 3 5 7 10
Answer:
5
Explanation:
The correct coefficient of oxygen is 5.
The question is incomplete, the complete question is;
Examine the chemical reaction C3H8 + O2----> 4H2O + 3CO2. What coefficient of O2 should be added so the number of atoms of oxygen is conserved on both sides of the reaction equation?
A: 3
B: 5
C: 7
D: 10
The principle of balancing chemical reaction equation is that the number of atoms of each element at the right hand side of the reaction equation must be equal to the number of atoms of the same element at the left hand side of the reaction equation.
Given the reaction; C3H8 + O2----> 4H2O + 3CO2, it will only become balanced when the coefficient of O2 is 5.
Hence, we can write; C3H8 + 5O2----> 4H2O + 3CO2
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A sample of wood occupies a space of 200 mL and has a mass of 75 g. What is the density?
Answer:
0.375 g/mL
Explanation:
Given data:
Volume occupy by wood = 200 mL
Mass of wood = 75 g
Density of wood = ?
Solution:
Formula:
d = m/v
by putting values,
d = 75 g/ 200 mL
d = 0.375 g/mL
define vapor pressure
Vapour pressure is a measure of the tendency of a material to change into the gaseous or vapour state, and it increases with temperature
write the cations and anions present in NaCl
Can someone please help me with this?
Answer:
Lonic.an electron will be transferred from potassium to the chlorine atom
[tex]\huge\boxed{Option C}[/tex]
_____________________________________IONIC BOND:Ionic bond is a type of bond which is formed between metals and non-metals. The group which provide the Metal are IA and IIA i.e. S block elements. The group which mostly provide non-metal is VII A i.e. halogens. The Metals give up their ONLY Valance shell electron which is accepted by the Non-metal. This results in formation of ions, The Metals gets the positive charge thus called cation and The non-metal gets a negative charge thus called anion. These Positive and Negative ion attract each other resulting in the formation of IONIC BOND.
The Ionic bond is formed between The metal and non metal because, the metals have low ionization energy due to which the valence shell is ejected out easily, and The Non-Metals have high electron affinity which means that they attract an electron with greater force because they need one electron to complete their octet.
_____________________________________Question:Question has given two atoms Potassium and chlorine. Potassium(Group 1) is metal, Chlorine(Group 7) is non metal. As you can se that there is only one electron in the outer shell of Potassium "K" and Chlorine need only one electron to complete its outer shell so Potassium will give its electron to Chlorine. Due to this reason K will become positive and Cl will become negative and they will both attract eachother forming ionic bond.
So the answer is Option C: Electron will be transferred from the potassium to the chlorine atom.
_____________________________________Best Regards,'Borz'