Answer:
its 25
Explanation:
Answer:
your answer should be c i had this qs before
Explanation:
4.Calculate the volume of 40g of Helium (He) at rtp.
Answer:
2.24dm³
Explanation:
Given parameters:
Mass of He = 40g
Unknown:
Volume of Helium = ?
Solution:
To solve this problem, we convert the given mass to number of moles.
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
molar mass of He = 4g/mol
Number of moles = [tex]\frac{4}{40}[/tex] = 0.1mole
So;
1 mole of gas at rtp occupies a volume of 22.4dm³
0.1 mole of He will occupy a volume of 0.1 x 22.4 = 2.24dm³
16. Put the following pairs in order from least polar to most polar:
a. C-H N-H H-O H-F
b. C-H
C-S
H-F
C-N
C-O
H-Br
i.
Which pair in part b has the most electronegative bond? Least electronegative bond?
17. Explain how you could use the electronegativity scale to determine the direction and degree of
polarity between two atoms. (Direction meaning which way does the dipole arrow point)
Answer:
I think A does because there are so many letters in their so a
What is a disadvantage of using solar energy?
Help
Answer:
D, last one.
Explanation:
In order to use solar energy, we need solar panels. Which we need sun for it to heat up, and once there is the sun. The heat can hit the water, and cause the water to burn/boil
The total pressure in a flask containing only hydrogen and helium is 580 mmHg. If hydrogen accounts for 70% of the pressure and helium contributes 30% of the pressure, what is the partial pressure of the hydrogen gas?
A) 406 mmHg
B) 510 mmHg
C) 174 mmHg
D) 83 mmHg
Answer:
Answer choice c = 174
Explanation:
If you divide 30% into 580 you get 174. You can also check your work by doing 580 divided by 70%
30% divided by 580 = 174
Calculate the concentration of 10g of magnesium chloride in 1dm3 of solution.
Answer:
0.105 mol/dm³
Explanation:
From the question given above, the following data were obtained:
Mass of MgCl₂ = 10 g
Volume of solution = 1 dm³
Concentration of MgCl₂ =?
Next, we shall determine the number of mole present in 10 g of MgCl₂. This can be obtained as follow:
Mass of MgCl₂ = 10 g
Molar mass of MgCl₂ = 24 + (2 ×35.5)
= 24 + 71
= 95 g/mol
Mole of MgCl₂ =?
Mole = mass /Molar mass
Mole of MgCl₂ = 10 / 95
Mole of MgCl₂ = 0.105 mole
Finally, we shall determine the concentration of MgCl₂. This can be obtained as follow:
Mole of MgCl₂ = 0.105 mole
Volume of solution = 1 dm³
Concentration of MgCl₂ =?
Concentration = mole / Volume
Concentration of MgCl₂ = 0.105 / 1
Concentration of MgCl₂ = 0.105 mol/dm³
Concentration is [tex]0.105\ mol/dm^{3}[/tex]
Given:-
Mass of MgCl₂ = 10 g
Volume of solution = [tex]1\ dm^{3}[/tex]
Concentration of MgCl₂ =?
[tex]Molar mass of MgCl_2 = 24 + (2\times35.5)\\= 24 + 71\\= 95 g/mol[/tex]
Mole of MgCl₂ =?
The number of moles is calculated by the equation as follows:-
[tex]Mole = mass /Molar massMole of MgCl_2= 10 / 95Mole of MgCl_2 = 0.105 mole[/tex]
Determine the concentration of [tex]MgCl_2[/tex] as follows:-
Mole of MgCl₂ = 0.105 mole
Volume of solution = 1 dm³
Concentration of MgCl₂ =?
[tex]Concentration = mole / Volume\\Concentration\ of\ MgCl_2 = 0.105 / 1\\Concentration \ of\ MgCl_2= 0.105 mol/dm^{3}[/tex]
Hence the concentration of 10g of magnesium chloride is [tex]0.105 mol/dm^{3}[/tex].
To know more about:-
brainly.com/question/16380318
_Li + __F2 → _LIF
How do I balance this?
Answer:
2Li + F₂ → 2LiF
Explanation:
The reaction expression is given as:
Li + F₂ → LiF
We are to balance the expression. In that case, the number of atoms on both sides of the expression must be the same.
Let use a mathematical approach to solve this problem;
Assign variables a,b and c as the coefficients that will balance the expression:
aLi + bF₂ → cLiF
Conserving Li: a = c
F: 2b = c
let a = 1, c = 1 and b = [tex]\frac{1}{2}[/tex]
Multiply through by 2;
a = 2, b = 1 and c = 2
2Li + F₂ → 2LiF
Please help me answer this question but in your own words!!!!
Answer:
when sodium reacts with chlorine atoms, sodium will give an electron which is negative charged to chlorine.it makes sodium(+) and chlorine (-)..then sodium will attract chlorine to form sodium chloride(NaCl)
6.
Tristan completed a lab that combusted 5.0 grams of sodium
Write a complete balanced equation for the combustion of sodium.
a
b. What is the maximum amount of product that Tristan can obtain in this lab?
Answer:
4Na + O₂ → 2Na₂O
6.82g
Explanation:
The combustion of sodium involves combining the element with oxygen gas:
4Na + O₂ → 2Na₂O
We have been given 5g of Na.
The balanced reaction equation is given as shown above. This reaction is also a synthesis or combination reaction.
b. Maximum amount of product that can be obtained.
Sodium is the limiting reactant and it will determine the amount of product that can be formed.
To solve this, we find the number of moles of the given sodium.
Mass of given sodium = 5g
Molar mass of Na = 23g/mol
Number of moles of Na = [tex]\frac{mass}{molar mass}[/tex]
Insert the parameters and solve;
Number of moles of Na = [tex]\frac{5}{23}[/tex] = 0.217moles
From the balanced reaction equation:
4 moles of Na will produce 2 moles of Na₂O
0.217 moles of Na will produce [tex]\frac{0.217 x 2}{4}[/tex] = 0.11mole of Na₂O
So;
Mass of Na₂O = number of moles x molar mass
Molar mass of Na₂O = 2(23) + 16 = 62g/mol
Mass of Na₂O = 0.11 x 62 = 6.82g
Which of the following is true of fault-block mountains and volcanic mountains but not true of folded mountains?
The Answer is not D
Form from the buildup of lava and ash
May have a steeply sloping, jagged appearance
May have a gently sloping, dome-shaped appearance
Form at both convergent and divergent plate boundaries
Answer:
This one seems tricky, but the answer is B.
Explanation:
The first answer choice is wrong because it only applies to volcanic mountains.
C. would be true for folded mountains and volcanic mountains, but not fault-block mountains. Fault-block mountains have steep slopes and jagged surfaces; hence why B is correct.
D. is wrong because it applies to all three types of mountains mentioned.
Really, volcanic mountains can have gentle slopes and steep slopes, as well as jagged appearances and dome-shaped appearances. All that has to be assessed is the characteristics of fault-block mountains. This would be described in answer choice B.
Help me asap pls man
Answer:
C
Explanation:
A p orbital has the approximate shape of a pair of lobes on opposite sides of the nucleus.
Explanation:
A p orbital would have a du-bbell shape.
Options A and B show a spherical shape, which are for s orbitals.
Option D shows a double du-bbell / clover leaf shape, which is for d orbitals.
The answer is Option C.
P.S. The word is censored apparently, so be forgiving! Thanks~
How many elements and how many atoms are in MgCI2
Answer: two elements and three atoms
Explanation:
An element is the simplest substance and hence cannot be broken down using chemical reactions.
Magnesium chloride [tex](MgCl_2)[/tex] is an ionic compound formed by the transfer of electrons from element magnesium (Mg) to element chlorine (Cl) where Magmesium forms a cation [tex]Mg^{2+}[/tex] by losing two electrons and chlorine forms an anion [tex]Cl^{-}[/tex] by gaining electron.
There are 3 atoms in Magnesium chloride [tex](MgCl_2)[/tex] which include one atom of magnesium (Mg) and two atoms of chlorine (Cl).
What is one effect of the Gulf Stream
Answer:
This strong current of warm water influences the climate of the east coast of Florida, keeping temperatures there warmer in the winter and cooler in the summer than the other southeastern states. Since the Gulf Stream also extends toward Europe, it warms western European countries as well.
Answer:
warm climates in northern Europe
Explanation:
I took the test in K12 and this was the answer :)
a sample of 1.7×10^23 molecules of silicon is ____ moles.
Answer:
0.28moles of silicon
Explanation:
Given parameters:
Number of molecules of silicon = 1.7 x 10²³molecules
Unknown:
Number of moles of the silicon = ?
Solution:
A mole of any substance contains the Avogadro's number of particles.
1 mole of a substance contains 6.02 x 10²³molecules;
So;
1.7 x 10²³molecules contains [tex]\frac{1.7 x 10^{23} }{6.02 x 10^{23} }[/tex] = 0.28moles of silicon
A compound decomposes by a first-order process. If 37 % of the compound decomposes in 60 minutes, the half-life of the compound is ________minutes.
Answer:
90 minutes
Explanation:
The half life of a first order reaction is;
t1/2 = ln(2) / k
To solve for t;
The integral rate expression for a first order reaction is;
ln[A] = ln[Ao] - kt
t = 60 minutes
Final Concentration = [A] = 100 - 37 = 63
Initial Concentration = [Ao] = 100
ln(63) = ln(100) - k (60)
k (60) = ln (100) - ln(63)
k = 0.4620 / 60 = 0.0077
Inserting the value of k in the half life equatin;
t1/2 = ln(2) / 0.0077 = 90 minutes
What information can be deduced from knowing which Group an element belongs?
A. Family name
B .Number of valence electrons
C. Chemical properties
D. All the above
Answer:
D. All of the above
Explanation:
Elements are being grouped in the "Periodic Table" in order to associate them with other elements that have similar properties. These elements also have the same number of "valence electrons" or electrons located in the outer shell. The groups are then classified into their "family names." For example, Group 1 is named "Alkali metals" because the elements within it are very reactive and have high conductive property. The valance electron of the elements in this group is "1."
Question 1
Which words in the passage help the reader understand the meaning of the word avid in the first paragraph?
A. What he found out
B. Many hours gardening
C.the curious and observant
D.he noticed
Which of the following best describes metallic bonding?
Answer:
D.the metal atom use their positive charges to gain additional electrons until every atom has eight valence electrons.
The statement which best describes the metallic bonding is (B). The valence electrons between the metals become decoalized and can move freely between the metallic cations.Hence the correct option is (B).
What is Metallic Bonding ?Chemical bonds known as metallic bonds are produced by the electrostatic attraction of positively charged metal ions and conduction electrons.
A structure of positively charged ions may be thought of as sharing free electrons.
Atoms in a metallic substance are held together by a force called the metallic bond. Atoms in such a solid are packed closely together. Each metal atom's outermost electron shell typically overlaps with a significant number of its nearby neighbors.
Therefore, The statement which best describes the metallic bonding is (B). The valence electrons between the metals become decoalized and can move freely between the metallic cations.Hence the correct option is (B).
Learn more about Metallic Bond here ;
https://brainly.com/question/16026653
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Which best describes MgO?
1)This is an ionic compound; it is named
magnesium monoxide.
2)This is a covalent compound; it is named
magnesium monoxide.
3)This is an ionic compound; it is named
magnesium oxide.
4)This is a covalent compound; it is named
magnesium oxide.
How does science affect our lives on the example of the pandemic?
Science affected our lives at the beginning of this pandemic.
Explanation:
Although scientists did study the virus to see how deadly it is the pandemic kept spreading. The spreading of the virus was not the scientist's fault it was the citizens' fault. They now found a vaccine that took hard work and a short amount of time.
What element would be found in period 5 that has similar chemical properties to Al?
Answer:
Indium
Explanation:
That is Indium (In) which is in same group as Al
SEnD NuuuDdddeeeeSss I you acccalty do you will get crown
Define energy and power then describe the relationship that exists between them.
Try for at least 3 complete sentences
Sentence starters:
Energy is.... Power is.... They are related because.....
Answer: With power and energy, power is units of energy divided by time. The same difference as distance and velocity. The units of power are watts, the units of energy are joules.
Explanation:
abcdefghijklmnopqrstuvwxyzExplanation:abcdefghijklmnopqrstuvwxyz
The number of covalent bonds that an
In a covalent bond, two atoms are held together by the attraction between
atom can form depends on the number of
in the atom.
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9
I x
3:21 PM
1/20/2021
Answer: please make the question more understandable
Explanation:
PLEASEEEE HELPPP ME WITH THISS
A person riding in the passenger seat of a car is "pushed" into the car door as the car makes a sharp left turn.
Newton's 2nd Law
Newton's 1st Law
Newtons 3rd Law
Answer:
second law
Explanation:
Beginning with hydrogen how do the chemical elements form?
a. glycerol
b. propane
c. alkene
d. amino acid
e. isopropanol
f. ring structure
g. alkyne
h. ethylene glycol
i. ester
j. organic acid
1. shape of aromatic hydrocarbons ___.
2. an alcohol with two hydroxyl groups ____.
3. molecule formed when a carboxylgroup replaces a hydrogen in a hydrocarbon __.
4. unsaturated hydrocarbon with at least one double bond ___.
5. example of a saturated hydrocarbon __.
6. molecule in which the —NH, radical replaces a hydrogen in a hydro-carbon __.
7. substance that forms when anorganic acid reacts with an alcohol __.
8. rubbing alcohol __.
9. an alcohol with three hydroxyl groups __.
10. hydrocarbon with at least one triple bond between carbon atoms __.
Oceans, and other bodies of water, are found on which layer of Earth?
Outer core
Mantle
Inner core
Crust
they are found on the crust
Answer:
crust
Explanation:
PLEASE ANSWER ITS DUE IN ABOUT AN HOUR!! What other body system does the diaphragm belong to?
Answer:
The respiratory system
Explanation:
Answer:
The diaphragm belongs to the respiratory system, digestive system, and muscular system.
I'm not too sure on the muscular system, but the other two 100%
Explanation:
Hopefully, this helps. :)
Spring ends on what day?
summer solstice
winter solstice
vernal equinox
autumnal equinox
Answer:
June 20
Explanation:
the mass of the sun
what is the mass of the sun
Answer:
1.989 × 10^30 kg
Explanation:
Hope this helps! :3
☁️ Answer ☁️
A solar mass is the mass of the sun. Or, more precisely, it's 1.989 x 10^30 kilograms — about 333,000 Earths. Astronomers use a solar mass as a basic unit of mass.
Dear fool, you will always be a fool.
Happy April Fools Day.
Hope it helps.
Have a nice day noona/hyung