Answer:
Mass = 33.515 g
Explanation:
Given data:
Volume of ammonia = 45.0 L
Temperature = 57.0°C (57 +273 = 330 K)
Pressure = 900 mmHg
Mass of ammonia = ?
Solution:
Formula:
PV = nRT
We will use R = 62.364 (L * mmHg)/(mol * K) because pressure is given in mmHg.
900 mmHg × 45.0 L = n × 62.364L * mmHg/mol * K × 330 K
40500 mmHg.L = n × 20580.12L * mmHg/mol
n= 40500 mmHg.L/ 20580.12L * mmHg/mol
n = 1.9679 mol
Mass of ammonia:
Mass = number of moles × molar mass
Mass = 1.9679 mol × 17.031 g/mol
Mass = 33.515 g
When we multiply or divide the values the number of significant figures must be equal to the less number of significant figures in given value.
Check out this long-form version of the periodic table. It shows where the two rows of
elements from question 4 really belong in the periodic table. Think about the challenges of
using this version of the periodic table.
Which statement offers the most likely explanation of why the long-form version of the
periodic table is seldom used?
The elements in the separate group are so rare that they do not occur in nature.
The elements in the separate group have very little in common with one another.
The long-form version no longer keeps the elements in order of increasing atomic
number.
The long-form version is too wide to easily fit on a computer screen or sheet of
paper.
Answer:
The long form version is too wide to easily fit on a computer screen or sheet of paper
Explanation:
PLEASE HELP A car burns gasoline to create hot air gas that expands to move the pistons in the engine, which causes the car to be able to move.
What energy transformations occur from the fuel to the movement of the car?
Thermal to mechanical
Thermal to chemical to mechanical
Chemical to thermal to mechanical
Chemical to electrical
Answer:
Chemical to thermal to mechanical
Explanation:
It is because gasoline is chemical energy which turns to thermal. Because it said hot gas which is thermal energy. Then it turns to mechanical for the car to even move.
All seeing eyes:
i know your answer it is the third one (C, chemical to thermal to mechanical)
Explanation:
my all seeing eyes know all the answers
Help please! I’ll mark brainliest to who ever answers this first!!
Answer:
paleontologists is the answer to scientist who studies fossil
The four molecules shown here are made of different combination of carbon, oxygen or hydrogen atoms. Below each molecule, list the types of atoms in it and how many atoms there are of each type. The the first is complete as an example
Answer:
1. Water molecule: Composed of two atoms of hydrogen and one atom of oxygen.
2. Oxygen gas molecule: composed of two oxygen atoms.
3. Carbon (iv) gas molecule: composed of one atom of carbon and two atoms oxygen.
Methane gas molecule: composed of one atom of carbon and four atoms of hydrogen.
Explanation:
1. The first molecule is a molecule of water. It is composed of two atoms of hydrogen and one atom of oxygen. The atom of oxygen is depicted in red color while the two hydrogen atoms are red in color.
2. The second molecule is an oxygen gas molecule. It composed of two oxygen atoms.
3. The third molecule is carbon (iv) oxide. It is composed of one atom of carbon (black color) and two atoms oxygen (in red color).
4. The fourth is the methane gas molecule. It is composed of one atom of carbon (black color) and four atoms of hydrogen (white color).
Green light has a frequency of 6.01 x 10^14 Hz. What is the wavelength? (Round to the nearest hundredth) *
Answer:
4.99 x 10⁻⁷ meters or 499 nanometers
Explanation:
Use the formula:
λ = c/ν, where λ = wavelength, c = the speed of light (it's constant, 2.998 x 10⁸ m/s), and ν = frequency
λ = (2.998 x 10⁸ m/s)/(6.01 x 10¹⁴ 1/s)
λ = 4.98835 x 10⁻⁷
Round to nearest hundreth and you get 4.99 x 10⁻⁷ meters, or 499 nanometers.
How many total atoms are in K2(H2AsO4)2
5
18
16
12
Answer:
18
Explanation:
go go evhdj kk nm go go go
A
occurs when what the scientist expects changes how the results of an experiment are viewed?
A. conundrum
B. bias
C. impass
Answer:
conundrum
Explanation:
its not bias or impass
ill give brainlist if you get it righttt...Radiant energy travels in the form of electromagnetic waves. Which statement describes how electromagnetic waves and sound waves are alike? (Hint: How are all waves alike?)
Question 6 options:
Both types of waves have an electrical and magnetic field
Both types of waves can travel in space
Both types of waves are mechanical waves
Both types of waves transfer energy
Answer:
Both types of waves transfer energy
Explanation:
I think that's right
Electromagnetic waves and sound waves both types of waves can transfer energy.
What are electromagnetic waves?The electromagnetic radiation consists of waves made up of electromagnetic field which are capable of propogating through space and carry the radiant electromagnetic energy.
The radiation are composed of electromagnetic waves which are synchronized oscillations of electric and magnetic fields . They are created due to change which is periodic in electric as well as magnetic fields.
In vacuum ,all the electromagnetic waves travel at the same speed that is with the speed of air.The position of an electromagnetic wave in an electromagnetic spectrum is characterized by it's frequency or wavelength.They are emitted by electrically charged particles which undergo acceleration and subsequently interact with other charged particles.
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Can somebody help me with this??!
the cost of table NaCl is Rs.20 per kg.Calculate its cost permole.
plzzzzz answer me
Answer:
Rs. 1.2 per mole
Explanation:
Given parameters:
Cost of NaCl = Rs. 20 per kg
Unknown:
Cost per mole = ?
Solution:
The problem here is simply to convert the unit to:
Rs. per mole
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of NaCl = 23 + 35.5 = 58.5g/mol
Now, for 1kg;
Number of moles = [tex]\frac{1000}{58.5}[/tex] = 17.1moles
So;
[tex]\frac{Rs. 20}{kg}[/tex] x [tex]\frac{1kg}{17.1moles}[/tex] = Rs. 1.2 per mole
Which element has the highest first ionization energy?
A) Si
B) P
C) S
D)Ci
And why?
Answer:
see the pic for more details
The element magnesium is a
O Group 12, Transition Metal
O Period 3, Alkaline Earth Metal
Period 4. Alkali Metal
O Period 4, Halogen
Which molecule contains a triple bond?
A.N₂
B.F₂
C.O₂
D.I₂
Answer:
N2.
Explanation:
Whoever answers this question first, with the right answer gets brainliest.
How might an entire insect be preserved?
Soft and hard tissues turn the insect into rock.
Tree sap flows over the insect and hardens.
Sediment accumulates over the insect and hardens.
Carbon from the decaying insect leaves a print on a rock.
Answer:
Tree sap...I think it sounds the best
Answer:
The Answer is B, Tree sap flows over insects and hardens.
Explanation:
like what the other person said above me.
Rays used to take pictures of bones in the human body are:
A. Infrared Rays
B. X-rays
C. Microwaves
D. Light Waves
Answer:
B
Explanation:
Because when you go to the doctors they say, "You need to get your x-rays done" not microwave
ERGENT IM TIMED!!!!!!!!!!!
Which compound forms a powerful acid and also contains a halogen? H2S HBr Li2O LiBr
Answer:
HBr is the strongest and its bond is what which makes it the strongest acid.
Explanation:
This acid is dangerous and highly poisonous than other acids. It can disunite instantly. And later then it forms the suspension.
Li_{2}OLi
2
O and LiBr is not merely an acid and henceH_{2}SH
2
S and HBr are the acids, amongst which HBr forms the strong acid component.
The strongest nature is due to the formation of hydronium ions.
The Hydrogen sulphide acid does not release hydronium ions on suspension.
Answer:
HBr is the strongest and its bond is what which makes it the strongest acid.
Explanation:
7th grade help me plzzzzzzz
the second one is space while the first one is shape
1= Shape
2= Space
plz vote brainleist
To pass a test with 15 questions how many can I get wrong?
Answer:
You can get 7 answers wrong.
Explanation:
Let's calculate the average
[tex]\frac{15}{2} \\\\=7.5[/tex]
So if you correctly answer 8 -15 (7.5 is approximated to 8 )questions correctly you will pass.
So you can get 7 answers wrong.
This is a science question. What is the skateboarder’s acceleration?
Answer:
2.4
Explanation:
Divide 7.0 by 3.0 you get 2.333333 then round it of to 2.34
What are the two parts of an atom ?
Answer:
The nucleus and the outer region.
Explanation:
Helppppp!!!! Please.....
Please help! I’ll mark brainliest for best answer!
Answer:
The Atomic Number
Explanation:
The X would be the Atomic Number or amount of protons sorrounding the nucleus of that atom.
Draw a Lewis structure for PF2Cl3 and answer the following questions based on your drawing
1. For the central phosphorus atom:
... The number of lone pairs =
The number of single bonds =
The number of double bonds =
2. The central phosphorus atom
... A. Obeys the octet rule
B. Has an incomplete octet.
C. Has an expanded octet.
Answer:
see the pic for more detail
The concept of covalent bond was introduced by the scientist G.N Lewis in 1916. The molecular geometry of PF₂Cl₃ is trigonal bipyramidal.
What is Lewis structure?In Lewis structure, dots represent electrons. Such structures are referred to as Lewis dot structures or simply Lewis structures. They provide a picture of bonding in molecules in terms of the shared pairs of electrons and the octet rule.
In PF₂Cl₃, 'P' with 5 electrons generally combines with fluorine and chlorine having seven electrons. So the total number of electrons in PF₂Cl₃ is 40.
1. The number of lone pairs = 0
The number of single bonds = 5
The number of double bonds = 0
2. PF₂Cl₃ obeys octet rule except phosphorous, because of the presence of extra orbital it can able to accommodate more than eight electrons. Hence its valency is found to be expanded and it is hypervalent.
Thus the correct option is C.
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Question 6 (1 point)
Sound, earthquakes, and waves in water are rechanical waves because they require
a physical to transport energy. (Lesson 4.02)
O electromagnetic field
O disturbance
O medium
location
Answer: The answer is MEDUIM
Explanation:
Why would metamorphic rock show signs of great stress?
7. Think and discuss: As you move down a group, you will recall that the radius increases.
Why do you think an increase in atomic radius would result in a lower
ionization energy?
8. Think and discuss: As you move across a period, you will recall that the radius decreases.
Why do you think a decrease in atomic radius would result in a greater ionization energy?
9. Predict: Electron affinity (EA) refers to the energy released when an electron is added to
an atom. This release of energy is always expressed as a negative value. The greater the
magnitude of the negative value, the greater the attraction for electrons. (An EA of -100
kJ/mol would indicate a stronger attraction for electrons than an EA of -50 kJ/mol.)
How do you think the size of an atom will affect its ability to attract additional electrons?
Answer:
See explanation
Explanation:
7. As we move down the group more shells are added. The addition of more shells means that the atom becomes larger and the outermost electron is now at greater distance from the nucleus and screening effect becomes very important. This greater screening effect of the inner electron reduces the magnitude of effective nuclear charge on the outermost electron thereby lowering the ionization energy.
8. As we move across the period, the effective nuclear charge increases without a corresponding increase in the number of shells. As a result of this, the outermost electron becomes more tightly bound to the nucleus as the atom becomes smaller and atomic radius decreases causing a rise in the ionization energy from left to right across a period.
9. Actually, the smaller an atom is the greater its electron affinity. The smaller the atom is, the more the outermost shell is drawn closer to the nucleus and this means that the atom is better able to attract electrons to itself.
It is due to the size of atom which varies its force of attraction.
As you move down a group, the atomic radius increases due to addition of more number of shells in an atom. This increase in atomic radius would result in a lower ionization energy because the valance electron is farther from the nucleus and held with weak attractive force so less energy is required to remove it.
While on the other hand, as we move from left to right in a periodic table the atomic radius decreases due to addition of more electrons which shrinks the atom and brought the valance shell closer to the nucleus so it becomes harder to remove an electron because the nucleus held these electrons very tightly.
The size of an atom will affect its ability to attract additional electrons because of its force of attraction. Atoms with small radius has more ability to attract electrons due to higher force of attraction as compared to higher atomic radius atoms.
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Which chemical equation follows the law of conservation of mass?
A. 2NaOH + H2S04 - Na2SO4 + H20
B. NaOH+H2SO4 - Na2SO4 + 2H20
C. 2NaOH + H2S04 - Na2SO4 + 2H20
D. NaOH + H2SO4 - Na2SO4+H20
Answer:
C. 2NaOH + H₂SO₄ -> Na₂SO₄ + 2H₂O
Explanation:
Simply count up the elements in the reactants and the products, then compare.
Reactants:
2 Na = 2 Na
2 O + 4 O = 6 O
2 H + 2 H = 4 H
Products:
2 Na = 2 Na
4 O + 2 O = 6 O
2 x H₂ = 4 H
Because the constituent elements in the reactants = products, the law of conservation of mass is preserved. You can check the other 3 options to see that they will not equal each other.
Don't forget to distribute the coefficients to every part of the formula; on the other hand, subscripts only apply to the element they are under. If a coefficient needs to be multiplied to an element with a subscript, use the subscript instead of 1 (1 is when there are no subscripts).
Select The on that most applys
Will mark brainliest
Answer:
A and B plz mark brainliest
Explanation:
Answer:
b and a is the answer here
Using dimensional analysis, how many kilometers are there in 34 inches?
Answer:
There are many ways to figuring this out: you could use a ruler, a calculator or scrap paper.
Explanation:
This is not an actual flat out answer, but it’s helpful methods to getting the answer the next time you are stuck. Hope you are having a nice day. Bless your heart and soul.
A student is able to lift 500N weight by applying 100N. What is the mechanical advantage of a simple machine?
Explanation:
Load=500N
Effort=100N
Now,
We have,
Mechanical advantage= Load / effort
= 500/100
=5
Therefore, mechanical advantage is 5.
