Answer:
Mass = 61.6 g
Explanation:
Given data:
Mass of ammonia produced = 75.0 g
Mass of nitrogen needed = ?
Solution:
Chemical equation:
N₂ + 3H₂ → 2NH₃
Number of moles of ammonia:
Number of moles = mass/molar mass
Number of moles = 75 g/ 17 g/mol
Number of moles = 4.4 mol
No we will compare the moles of ammonia with nitrogen.
NH₃ : N₂
2 : 1
4.4 : 1/2×4.4 =2.2 mol
Mass of N₂:
Mass = number of moles × molar mass
Mass = 2.2 mol × 28 g/mol
Mass = 61.6 g
Which energy source releases the most carbon dioxide?
O solar
O wind
O nuclear
O coal
Answer:
Coal
Explanation:
Coal is by far the worst emitter, followed by natural gas, with solar, wind and nuclear all low-carbon.
Coal, a non-renewable energy source releases the most carbon dioxide into the atmosphere.
What are energy sources?Energy sources refers to the various sources in which energy for man's needs are obtained.
There are two types of energy sources:
Renewable energy sourcesNon-renewable energy sourcesThe non-renewable energy sources such as coal release large amounts of carbon dioxide until The atmosphere.
Therefore, Coal, a non-renewable energy source releases the most carbon dioxide into the atmosphere.
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1. What kinds of metals are REALLY reactive? why?
2. What kinds of non-metals are REALLY reactive? why?
3. What group on the periodic table doesn’t react at all? why?
Answer:
1. Alkali metals (group 1)
2. halogens (Group 17)
3. noble gasses (group 18)
Explanation:
1. alkali metals only have one valence electron meaning that they really want to lose that one valence electron to get a full octet.
2. halogens have 7 valence electrons meaning that they just need to gain 1 to get a full octet.
3. Nobel gasses already have a full octet meaning that they don't want to react. (atoms only react to get a full octet)
I hope this helps. Let me know if anything is unclear.
look at the picture below of an astronaut at two different distance from a planet. in which position A and B would there be a stronger gravitational pull between the astronaut and the planet? Explain
please help please please please please please please please please help it's due right now at 8:20pm please please help please really need help please
Answer:
B
Explanation:
Gravitational pull is stronger when the person is closer to the planet.
The gravitational force is the fundamental force of the universe. Here the astronaut at position B will experience a stronger gravitational pull as compared to the astronaut at position A.
What is gravitational force?The gravitational force is defined as the force of attraction between any two bodies is directly proportional to the product of their masses and is inversely proportional to the square of the distance among them.
F = G m₁m₂ / r²
The gravitational force decreases with the increase in the distance. So here distance of astronaut at position B which is closer to the planet experience greater gravitational pull.
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how many elements are found in the third period. A.2 B.18 C.8 D.32
Answer:
8
Explanation:
u can find it on ur chemistry book
Answer:
C. 8
Explanation:
Check chemistry textbook
Who asked the question “can you split matter forever?”
Answer:
Of course, what we today call atoms can be divided into more elementary particles, but not that many.
Explanation:
Renewable resources can be replenished in a short period of time. true or false
Answer:
they can be over a short period of time. so true
Explanation:
How many double covalent bonds can form with a hydrogen atom
answer: covalent bonds
A kind of sedimentary rock formed from plant material over a long period of time is __________.
a.
limestone
b.
cementation
c.
coal
d.
compaction
Please select the best answer from the choices provided
A
B
C
D
Answer:
Cementation
Explanation:
Sedimentary rocks are types of rock that are formed by the accumulation or deposition of mineral or organic particles at the Earth's surface, followed by cementation. Sedimentation is the collective name for processes that cause these particles to settle in place :)
Answer:
Coal
Explanation:
Coal is formed from plants trapped in dust and dirt for a long time, so coal would fit plant material, and it also takes a long time to make coal, that's why it will run out at some point
how many moles of atoms of each element in one mole (NH4)2CO3
Answer:
Chemists generally use the mole as the unit for the number of atoms or molecules of a material. One mole (abbreviated mol) is equal to 6.022×1023 molecular entities (Avogadro's number), and each element has a different molar mass depending on the weight of 6.022×1023 of its atoms (1 mole).\
Have a great day!!!!
Explanation:
1 mole of (NH₄)₂CO₃ has:
2 moles of N atoms.8 moles of H atoms1 mole of C atoms.3 moles of O atoms.Let's consider the chemical formula of ammonium carbonate: (NH₄)₂CO₃.
The subscripts inform us of the number of moles of atoms in 1 mole of molecules.
Nitrogen has 2 subscripts: "1" (which is not written) and "2" (outside the parenthesis). The global subscript for nitrogen is obtained by multiplying both subscripts.
[tex]N: 1 \times 2 = 2[/tex]
Hydrogen has 2 subscripts: "4" and "2" (outside the parenthesis). The global subscript for nitrogen is obtained by multiplying both subscripts.
[tex]H: 4 \times 2 = 8[/tex]
The subscript for carbon is "1".
The subscript for oxygen is "3".
1 mole of (NH₄)₂CO₃ has:
2 moles of N atoms.8 moles of H atoms1 mole of C atoms.3 moles of O atoms.Learn more: https://brainly.com/question/375587
How many significant figures
are in this number?
21.00
Answer:
4
Explanation:
the significant figures are 2 1 0 0
What is an nucleus ?
Nucleus is present at the centre of atom. It contains protons and neutrons. It is very small as compared to the atom.
Answer:
It is a part of a cell which controls all the activities in the cells and contains the genetic information of the cell that is to be passed down to the next cell when it reproduces.
Explanation:
It is a part of a cell which controls all the activities in the cells and contains the genetic information of the cell that is to be passed down to the next cell when it reproduces.
Which statement about the surface of the moon is true?
o There is water and air, but no life on the moon's surface.
O There is no air, wind, liquid water or life on the moon's surface.
There are liquid seas on the moon's surface.
It is very windy on the moon's surface.
Answer:
There is no air, wind, liquid water or life on the moons surface.
Explanation:
Answer:
ok i know it wont help now bc this was in 2020 but i did this on my lessons and its: There is no air, wind, liquid water, or life on the moon's surface.
Explanation:
i got all the right except the last one
How many moles of gas at 58° C does it take to fill a 1.75 L flask to a pressure of 12.5 kPa? Please help I will give brainliest
Answer:
0.008 moles of gas are present
Explanation:
Given data:
Volume of gas = 1.75 L
Number of moles = ?
Temperature of gas = 58°C
Pressure of gas = 12.5 KPa
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 convert the temperature.
58+273 = 331 K
Pressure = 12.5/101 = 0.12 atm
by putting values in formula:
0.12 atm× 1.75 L = n× 0.0821 atm.L/ mol.K ×331 K
0.21 atm.L = n× 27.17atm.L/ mol
n = 0.21 atm.L /27.17atm.L/ mol
n = 0.008 mol
What is the atomic radius
Answer:
The atomic radius of a chemical element is a measure of the size of its atoms, usually the mean or typical distance from the center of the nucleus to the boundary of the surrounding shells of electrons.
why is more dew formed on a grass and not on polished metal surface
Answer
Incidentally, they all form dew but because grass is closer to the soil, which maintains heat longer than the air where tree leaves are found, you will find more condensation in that region. Also, higher up the wind and sun will allow faster evaporation which makes the dew less noticable on tree leaves.
Explanation:
Preferred objects of dew formation are thus poor conducting or well isolated from the ground, and non-metallic, while shiny metal coated surfaces are poor infrared radiators. ... If the wet soil beneath is the major source of vapor, however (this type of dew formation is called distillation), wind always seems adverse.
1. What is a wave?
a.) a vibrating disturbance that transfers energy from place to place
b.) a material which a wave travels through
c.) an area where coils spread out
d.) the maximum distance a medium moves from its rest position
Answer:
A.
Explanation:
A wave is a disturbance that moves energy from one place to another. Only energy — not matter — is transferred as a wave moves. The substance that a wave moves through is called the medium. That medium moves back and forth repeatedly, returning to its original position. But the wave travels along the medium
In which unit is the wavelength of an electromagnetic wave commonly measured?
A. J
B. nm
C. s-1
D. kg
Answer:
nm
Explanation:
trust me:)
Reacting 10.0 mL of H2(g) with 10.0 mL of C2H4(g) produces 10.0 mL of C2H6 at 1.5 atm. If the reaction produces 3.1 kJ of heat and the decrease in volume requires the heat surroundings do 7.6 J of work on the gases, what is the change in internal energy of the gases?
Answer:
the change in internal energy of the gases is -3.0924 KJ
Explanation:
The computation of the change in internal energy of the gases is as follows;
Given that
Q = -3.1 KJ
= -3100 J
It is negative as the heat is lost from the mixture
And,
W = + 7.6 J
It is positive as the work is done in the mixture
Now we use the following equation
Delat E = Q + W
= -3100 J + 7.6 J
= -3092.4 J
= -3.0924 KJ
Hence, the change in internal energy of the gases is -3.0924 KJ
After food is consumed, chemical nutrients are absorbed into the blood. The blood then carries these nutrients to the body's cells where the nutrients enter mitochondria. Which reaction must occur next for the cell to carry on other activities?\
Answer:c. oxygen,light,and glucose combine to produce high energy molecules
Explanation:
How many atoms are in 8.2 moles of magnesium
Answer:
4.93804*10^24 atoms
Explanation:
Hope this helped!
The average speed of an oxygen molecule is 6.14 x 104 cm/sec at a certain temperature. What is the average speed of a CO2 molecule at the same temperature? (molar mass O2 = 31.9988; CO2 = 44.0098)
Answer:
the average speed of [tex]V_{av} CO_2[/tex] is 5.24 × 104 cm/s
Explanation:
The computation of the average speed of a [tex]CO_2[/tex] is as follows:
[tex]\sqrt{average} = \sqrt{\frac{8 RT}{\pi M} }[/tex]
where,
M = Molar mass
[tex]V_{av} = \frac{\sqrt{1}}{M}[/tex]
Given that
[tex]V_{av} \ of\ oxygen= 6.14 \times 10^4 cm/s[/tex]
The molar mass of oxygen i.e. (MO_2) = 31.9988 g/mol
And, the molar mass of CO_2 is 44.0098 g/mol
Now
[tex]\frac{V_{av} CO_2}{V_{av} O_2} = \frac{\sqrt{M_{O2} }}{M_{CO2}}[/tex]
Now place these values to the above formula
[tex]\frac{V_{av}CO_2}{6.14\times 104 cm/s} = \frac{\sqrt{31.9988} }{44.0098}[/tex]
So,
V_av CO_2 is 5.24 × 104 cm/s
hence, the average speed of [tex]V_{av} CO_2[/tex] is 5.24 × 104 cm/s
What is the molecular structure of H2O?
Answer:
A water molecule consists of two hydrogen atoms and one oxygen atom. The three atoms make an angle; the H-O-H angle is approximately 104.5 degrees. The center of each hydrogen atom is approximately 0.0957 nm from the center of the oxygen atom.
Explanation:
What is the electron configuration of chlorine (CI)?
A. 1s22s22p63s23p3
B. 1s22s22p63s23p5
C. 1s22s22p63s24s23p3
D. 1s22s22p63s23p23d3
The correct answer is B on edg 2020
Answer: it is b
Explanation:
PLEASE HELP!!
Which of the following correctly shows the net ionic equation for the reaction between iron (iii) sulfate and potassium hydroxide?
DUE IN 3 MINS!
The net ionic equation for the reaction between iron (iii) sulfate and potassium hydroxide is
Fe³⁺(aq) + 3OH¯(aq) —> Fe(OH)₃(s) (Option B)
What is a chemical equation?Chemical equations are representations of chemical reactions using symbols and formula of the reactants and products.
The reactants are located on the left side while the products are located on the right side.
Reactants —> Products
The balancing of chemical equations follows the law of conservation of matter which states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.
How to write the net ionic equationIn solution
Fe₂(SO₄)₃ (aq) --> 2Fe³⁺(aq) + 3SO₄²⁻(aq)
KOH (aq) --> K⁺(aq) + OH¯(aq)
The reaction proceeds as follow
Fe₂(SO₄)₃ (aq) + KOH (aq) —>
Fe³⁺(aq) + SO₄²⁻(aq) + K⁺(aq) + OH¯(aq) —> Fe(OH)₃(s) + SO₄²⁻(aq) + K⁺(aq)
Cancel out the spectator ions (i.e SO₄²⁻ + K⁺) and balance to obtain the net ionic equation
Fe³⁺(aq) + 3OH¯(aq) —> Fe(OH)₃(s)
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The volume of a gas with an initial pressure of 380 mmHg atm increases from 5.0 L to 8.0 L. What is the final pressure of the gas, in atm, assuming no change in moles or temperature?
A) 238 atm
B) 2.4 atm
C) 0.31 atm
D) 0.80 atm
E) 8.0 atm
Answer:
0.31 atmExplanation:
The new pressure can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
Since we are finding the new pressure
[tex]P_2 = \frac{P_1V_1}{V_2} \\[/tex]
From the question
760 mmHg = 1 atm
380 mmHg = 0.5 atm
We have
[tex]P_2 = \frac{0.5 \times 5}{8} \\ = 0.3125[/tex]
We have the final answer as
0.31 atmHope this helps you
A scientist claimed that he radiocarbon dated a fossilized skull of a dinosaur and found it to be about 63 million years old. Do you support his claim? Provide at least one scientifically based reason why you do or do not support the claim.
Answer:Since dinosaurs are thought to be over 65 million years old, the news is stunning - and more than some could tolerate. After the AOGS-AGU conference in Singapore, the abstract was removed from the conference website by two chairmen because they could not accept the findings. Unwilling to challenge the data openly, they erased the report from public view without a word to the authors. When the authors inquired, they received this letter:
Explanation:
i do not own my copyrights
Which reason best explains why metals are malleable?
A. because they have delocalized electrons
B. because they have localized electrons
C. because they have ionic bonds
D. because they have rigid bonds
The correct answer is A on edg 2020
A radioactive element having and atomic number 82 and atomic mass 214 emits a beta particle. The resulting element is:______.
Answer:
[tex]\frac{214}{83} Bi[/tex]
Explanation:
In beta emission, a neutron is converted into a proton thereby reducing the neutron:proton (N/P) ratio.
When a beta emission occurs, the mass number remains the same while the nuclear charge increases by one unit. The daughter nucleus is found one place to the right of its parent in the periodic table.
The formula for calculating power is work divided by time (power = work + time). What are two ways of stating the same relationship?
work = power + time
nwork s power x time
power
time = work x power
Opower workx time
time
Work
Answer:
See the answer below
Explanation:
The formula for calculating power is such that;
power = work/time
Two ways to restate the relationship between the 3 variables would be to make time and work the subject of the formula respectively.
1. When time if made the subject of the formula;
time = work/time
2. When work is made the subject of the formula;
work = power x time
Which of the following best describes foliated metamorphic rocks?
A
There are easily recognizable fossils.
B
The rock has ribbon-like layers of bands.
C
They have crystals like igneous rocks.
D
Different sized sediments can be seen.
Answer:
It's C because Metamorphic rocks were once igneous rocks. And, because Gneiss which is a Metamorphic rock has crystals inside of it.
Different rock types appear during rock formation. The best description of foliated metamorphic rocks is that;
B . The rock has ribbon-like layers of bands.Due to the pressure and heat that is exerted on some rock types, there is an alignment or foliation of rocks. The appearance can be described as ribbon-like.
The examples of rocks that fall under this classification are slate, phyllite, gneiss, and schist.
The non-foliated rocks do not show any alignment in their minerals. Examples are; quartzite, marble, and novaculite.
Summarily, option B best describes a foliated metamorphic rock.
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