Answer:
3- is the charge and 8 dots on its Lewis dot structure.
Explanation:
Hello there!
In this case, since nitrogen is an element with five valence electrons (electrons on its outer shell), we infer that it needs three bonds to complete the octet, for which its charge, when forming nitride ions is 3-, which means it has received three electrons. Thus, when drawing the Lewis dot structure, it is evident that is will have 5+3 = 8 dots due to the electron reception.
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Balance this
Al+H2————-> AlH3
The balanced equation is
2Al + 3H2 ---> 2AlH3
The reaction O3 + NO → O2 + NO2 has Ea = 10.7 kJ/mole and ΔH = – 199.8 kJ/mole. What is the activation energy for the following reaction?
O2 + NO2 → O3 + NO
Answer:
Ea = 210.5kJ/mole
Explanation:
When the reaction:
O3 + NO → O2 + NO2
Occurs, requires 10.7kJ/mole and releases -199.8kJ/mole.
For the forward reaction:
O2 + NO2 → O3 + NO
The Ea is the sum of Ea of the forward reaction and - ΔH, that is:
Ea = Ea - (-ΔH)
Ea = 10.7kJ/mol - (-199.8kJ/mol)
Ea = 210.5kJ/mole
A toy balloon is filled to 135 mL at a temperature of 22.5 °C (295.5 K). What temperature in Kelvin does it need to be heated to expand to 250 mL?
Answer:
T2 = 547.2K
Explanation:
Given:
V1 = 135 ml. V2 = 250 ml
T1 = 295.5K. T2 = ?
Using Charles's law and solving for T2,
V1/T1 = V2/T2
T2 = (V2/V1)T1
= (250 ml/135 ml)(295.5K)
= 547.2K (or 273.2°C)
What is the change in energy of a gas at a pressure of 105 kPa, if 245 J of energy is added causing a change in volume from 25.3 L to 38.6 L?
Answer:
-1151.5 J
Explanation:
Given that:
The supplies energy = 245 L
The energy used in the expansion of gas = Pressure ×ΔV (change in volume)
At standard conditions;
Pressure = 105 × 10³ Pa
energy used in the expansion = 105 × 10³ Pa × (38.6 - 25.3)L
= 1396.5 J
Thus, the change in the energy of gas = 245 - 1396.5 J
= -1151.5 J
Hence, we can conclude that the gas has lost its own energy in the process of expansion.
Convert 4.8 moles of calcium carbonate to
particles.
Answer:
2.89 × 10²⁴ particlesExplanation:
The number of particles can be found by using the formula
N = n × L
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is 6.02 × 10²³ entities
We have
N = 4.8 × 6.02 × 10²³
We have the final answer as
2.89 × 10²⁴ particlesHope this helps you
What are the names of the 3 types of
galaxies?
A. spiral, elliptical, electromagnetic
B. spiral, irregular, electromagnetic
C. elliptical, obtuse, irregular
D. spiral, elliptical, irregular
How are the atoms shown in the atomic-scale models different from actual atoms
Answer:
the nuclear of all atoms contain subatomic particles called protons
Explanation:
I hope this is right
Can you help me? I need help.
Answer:
C, blowing through underground tunnels
Explanation:
All the other ones are accurate.
One very common way spores/seeds are spread is through the wind. MAny plants use this to reproduce.
Spreading seeds by burrs is not as common as the other methods of reproduction, and is never used for spore reproduction found in certain organisms.
Lastly we have organisms eating fruit and spreading the seeds. There are two ways fruited plants reproduce. Either A, they reproduce by lettign their fruit fall to the earth, and when the fruit decomposes, the seeds are realesed intot eh soil. Or B, the fruit is eaten by organisms, and spread into the soil during fecalization. The feces of the organism can even help the seeds of the plants grow.
Hope this helps! ;)
water, soil, temperature, space
Answer:
wdym??
Explanation:
Answer:
wdym by water, soil, temperature, space?
3.00 L of a gas is collected at 35.0°C and 705.0 mmHg. What is the volume at STP?
Group of answer choices
2.55 L
1.65 L
2.47 L
3.10 L
Answer:
2.47L
Explanation:
Using the combined gas law equation as follows:
P1V1/T1= P2V2/T2
Where;
P1 = initial pressure (mmHg)
P2 = final pressure (mmHg)
V1 = initial volume (L)
V2 = final volume (L)
T1 = initial temperature (K)
T2 = final temperature (K)
According to the information provided in this question;
P1 = 705mmHg
P2 = 760mmHg (STP)
V1 = 3.00L
V2 = ?
T1 = 35°C = 35 + 273 = 308K
T2 = 273K (STP)
Using P1V1/T1= P2V2/T2
705 × 3/308 = 760 × V2/273
2115/308 = 760V2/273
Cross multiply
308 × 760V2 = 2115 × 273
234,080V2 = 577,395
V2 = 577,395 ÷ 234,080
V2 = 2.47L
Choose all that apply. Refraction telescopes:
1. are used to pick up the faintest objects in the sky
2. have small lengths compared to other telescopes
3. are used when image quality is important
4. require less maintenance
5.are used by professional astronomers
Answer:
answer is option ( 1) (2) (3)
Gary wanted to find out if some food colourings contained a banned food dye.
He put a drop of each food colouring and the banned food dye onto some special paper.
He hung the paper in a beaker of water.
After 10 minutes, the banned food dye and some of the dyes from the food colourings had moved up the paper.
Gary’s results are shown below.
(a) Gary wrote the labels on the paper in pencil. Why should he not write them in ink?
Explanation:
njsnjsjiwnaibainaondodnodn9nsine8ni
How many grams of Mg would be needed to react with 6.0 moles HCl?
Answer:
72g
Explanation:
The balanced equation of the reaction between Magnesium (Mg) and hydrochloric acid (HCl):
Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)
Based on this equation, 1 mole of Mg needs to react with 2 moles of HCl.
Hence, 6 moles of HCl will need to react with 6 × ½ = 3 moles of Mg.
Using the formula; mole = mass/molar mass
Molar mass of Mg = 24g/mol
3 = mass/24
mass = 72g.
ito Ang naimbento ni graham bell na nagpabilis sa pakikupagtalastasan
Answer:
ФОТОГРОФИРУЙ
ИЛИ НАПИШИ
В КОМЕНТЫ
Which gas variable has to do with the amount of collisions of gas particles has?
(I think it’s temperature but I’m not sure)
Pressure
Temperature
Amount
Volume
I NEED NOW PLEASE HELP How many grams of KF are need in order to produce 2.0 mol CaF?
An artificial biosphere is an enclosed area that contains the elements necessary for human life to exist. Suppose scientists want to develop an artificial biosphere on a new planet. The new planet has an atmosphere that is 96% carbon dioxide with only trace amounts of oxygen. What could humans do to make enough oxygen to survive? Explain your answer.
Answer:
See Explanation
Explanation:
A biosphere is a zone of life found on earth. Since the artificial biosphere has all the elements that support and sustain human life, then there must also be soil in the artificial biosphere.
If that is the case, then we can engage in massive tree planting. Trees take in carbon dioxide and release oxygen. Hence if a large number of trees are planted all over the artificial biosphere, the trees will eventually produce large enough oxygen to support human life overtime.
1
Select the correct answer.
Which type of energy is thermal energy a form of?
OA.
chemical energy
B.
kinetic energy
O c.
magnetic energy
OD
potential energy
Reset
Next
Answer:
i think kinetic energy sorry if I'm wrong.
1
Which of the following is a mixture?
A air
B copper
C oxygen
D steam
Answer:
A air
Explanation:
Air is a mixture but not compound. Its constituents can be separated. For example: oxygen, nitrogen etc. by physical process.
how many teaspoons of jelly would be required to use 36 slices of bread?
Answer:
depends on how much jelly u like
how did the idea of triads influence the development of the periodic table , even though more than three elements share similar properties ?
A. It established element families
B. It established element groups numbered 1-18
C. It gave rise to the idea of the law of octave
D. It gave rise to the idea of periodicity
Johann Döbereiner identified triads of chemically related elements in 1829 and demonstrated how the properties of the middle element could be anticipated from the properties of the other two. Examples of such triads are lithium, sodium, and potassium.
How did the idea of triads influence the development of the periodic table?
Johann Dobereiner (1780–1849), a German scientist, organized diverse trios of three elements into triads in 1829.Lithium, sodium, and potassium made up one such trio.Triads were based on both chemical and physical characteristics. All known elements could fit on Mendeleev's periodic table, and it also made precise predictions about the presence and characteristics of yet-to-be-discovered elements. Mendeleev organized the elements in his first periodic table according to their masses and other chemical characteristics.Atoms' fundamental chemical structure was unknown at the time.Mendeleev increased the size of his periodic table to include every element at the time. The law of triads was discovered by German scientist Johann Döbereiner, who wrote: "If the elements with similar chemical properties are grouped in the groups of three, the atomic weight of the middle element will be deemed almost equivalent to the arithmetic mean of the two-terminal element's total." The arithmetic mean of the atomic masses of the first and third elements must be about equal to the atomic mass of the second element in order to form a Dobereiner trio.The atomic mass of nitrogen is equal to the arithmetic mean of the atomic masses of carbon and oxygen in this situation, which is 14.They so make up Dobereiner's trio.To learn more about periodic table refer
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Some nuclear waste is stored about 600 meters
below the desert in New Mexico inside caverns dug
out of an ancient bed of rock salt. The land above
the storage site is owned by the federal
government. Why do you think this location was
chosen?
Answer:
This location was chosen because rock salt has qualities that can withstand the negative effects of nuclear waste and prevent it from causing any harm to the biosphere and all life in it.
Explanation
How to properly dispose of radioactive waste has always been a great problem due to its very high potential to negatively affect life in every form. There have been several kinds of research into the best ways to dispose of such waste. In times past, we have seen radioactive waste sealed up in drums and disposed of. These drums are not everlasting and can be subject to accidents, weakened by weather, etc thus creating a radioactive leak.
One of the results of the research was to store such waste away far below the ground where there are deposits of rock salt.
Radioactive waste generates tremendous amounts of heat if buried in ordinary underground sites and can contaminate underground water channels with radioactive poisoning. So if it were to be buried underground, it had to be in a site that is impregnable by water with very high resistance to heat.
It has been discovered that rock salt has very high boiling and melting points which are 1413 degrees Celsius and 807 degrees Celsius respectively. This makes the ancient bed of rock salt a preferred location by the US government for storing nuclear waste.
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Which chemical reaction is the fastest?
A. Oven cleaner absorbs cooked grease overnight.
B. Cake rises as it cooks in the oven.
C. Drain cleaner fizzes up as it encounters blockages in a pipe.
D. Milk turns sour.
Answer:
C) drain cleaner fizzes up as it encounters blockages in a pipe
Explanation:
Look at the image shown.
What does this image represent?
• Linear molecule with one domain
• Linear molecule with two domains
© Tetrahedral molecule with four domains
O Trigonal planar molecule with three domains
Answer:b) Linear molecule with two domains
Explanation:
Answer:
Linear molecule with two domains
Explanation:
A molecule with two domains will have a total of one bonded atom and one lone pair on the central atom, or two bonded atoms and zero lone pairs on the central atom.
Why does an "acid spill kit" often contain baking soda?
Question options:
A) Baking soda is a weaker acid, which will raise the solution's pH.
B) Baking soda will absorb the acid so that it can be swept up.
C) Baking soda is a strong base that will react violently with the acid.
D) Baking soda is a weak base and will neutralize the acid.
Baking soda neutralizes the acid so D
Baking soda is a weak base and will neutralize the acid.
Explanation:
The baking soda's chemical name is sodium hydrogen carbonate with a molecular formula of [tex]NaHCO_3[/tex].It is basic in nature and neutralizes the acid.It is a weak base, actually an alkaline salt of a strong base, and weak acid.The general reaction of baking soda with acid is given as:[tex]NaHCO_3+HA\rightarrow NaA+H_2O+CO_2[/tex]
(Where: HA is the general formula of an acid)
That is why the baking soda is present in the acid spill kits. So from this, we can conclude that the correct answer is option D.
Learn more about baking soda here:
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Which skills would an infant most likely have? Check all that apply.
the ability to manipulate scissors to cut paper
the ability to recognize siblings in a crowd
the ability to sit down when told to do so
the ability to read a story
the ability to express sadness
the ability to run around and chase
Answer:the ability to express sadness, recognize siblings in a crowd
Explanation:
there’s probably a few that i missed but i know those ones should be correct
Sorry it's late but
Answer:
-the ability to recognize siblings in a crowd
-the ability to sit down when told to do so
-the ability to express sadness
-the ability to run around and chase
An unknown substance has the chemical formula: Fez(C204)3 A molecule of the unknown substance contains A 3 fluorine atoms, 2 calcium atoms, and 4 oxygen atoms. 2 iron atoms, 6 carbon atoms, and 12 oxygen atoms. , 2 iron atoms, 2 carbon atoms, and 12 osmium atoms. 1 fluorine atom, 2 europium atoms, 8 copper atoms .
Answer:
Explanation: It is an ionic compound Fe2(C2O4)3
The compound with the formula Fe₂(C₂O₄)₃ contains two iron atoms, 6 carbon atoms and 12 oxygen atoms. Thus option C is correct.
What is chemical formula?Chemical formula of a compound or molecule represent the identity of the compound by representing which atoms are present in how many numbers.
Chemical formula is significant in representing a compound and distinguish it from other compounds.The number of each atom are given as subscripts for the symbol of each atoms.
If any group of atoms such SO₄ group or CO₃ group repeats in the compound put them in brackets and their number is given outside.The compound Fe₂(C₂O₄)₃ contains 2 iron atoms because Fe is the symbol of iron.
C₂O₄ is oxalate group and it is 3 in number. Two carbon and 4 oxygens are there in one oxalate group. Thus there are total 6 carbons and 12 oxygens in 3 oxalate groups. Hence option C is correct.
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The saturation point for a solution is 25.0 grams of solute per 500 grams of solvent. If you pour 50.0 grams of solute into 800. grams of solvent, how many grams of
solute are in solution?
Plz help me!!
Answer:
I think 50 grams only because you have pour 50 grams of solute in to 800 grams of solvent.
BRO THIS IS THE 3RD TIME IVE PUT THIS UP CAN SOMEONE HELP NO LINKS OR TROLLS
Answer:
1) AgNO3 (aq) + KCl (aq) -> AgCl (s) + KNO3 (aq)
Ag+ (aq) + NO3- (aq) + K+ (aq) + Cl- (aq) -> AgCl (s) + K+
(aq) + Cl- (aq)
Ag+ (aq) + Cl- (aq) -> AgCl (s)
2) 2NaCl (aq) + K2CO3 (aq) -> Na2CO3 (aq) + 2KCl (aq)
3) Fe(NO3)3 (aq) + 3NaOH (aq) -> Fe(OH)3 (s) + 3NaNO3
(aq)
Fe³+ (aq) + 3NO3- (aq) + 3Na+ (aq) + 3OH- (aq) ->
Fe(OH)3 (s) + 3Na+ (aq) + 3NO3- (aq)
Fe³+ (aq) + 3OH- (aq) -> Fe(OH)3 (s)
4) BaBr2 (aq) + Na2SO4 (aq) -> BaSO4 (s) + 2NaBr (aq)
Ba²+ (aq) + 2Br- (aq) + 2Na+ (aq) + SO4²- (aq) ->
BaSO4 (s) + 2Na+ (aq) + 2Br- (aq)
Ba²+ (aq) + SO4²- (aq) -> BaSO4 (s)
Explanation:
Sorry, I couldn't make the charges superscript. Don't know how.
On #2, no reaction occurs; everything stays aqueous.
Why is the death of a Star important for our life on Earth?
Explanation:
The reason why stars are so important is that they have helped humans navigate through Earth. When it was dark these stars would light up the sky giving people lightly. In addition, stars are very important because they make life on Earth. ... Earth would just be a rock with ice.