Answer:
the basic elements of environment are lithosphere, hydrosphere, atmosphere and biosphere.
Explanation:
2 H2 + O2 = 2H2O You have 20 grams of H, what's the mass of water?
Answer:
2H2 + O2 —-> 2H2O
The mole ratio of H2 to H2O is 2 : 2 = 1:1
4 moles of H2 = 4 moles of H2O
Moles of H20 = 4mol
Molar mass of H2O = 18g/mol
Mass = moles X Molar mass
= 4mol x 18g/mol
= 72g
Mass of H2O is 72g
The state of matter represented on the right (letter D) has the
highest energy. Of the four choices shown, which is plasma?
B. B.
A. A
D. D
С. С
Answer:
A is the answer.
Explanation:
gorgeousness
10 points get it right ADVPH
Answer:
Advanced Pharmaceutics Inc
Explanation:
Advanced Pharmaceutics Inc
somehow I know this acroynom
Explain why the available amount of water per person differs between countries
Answer:
because in the different countries it is distributed unevenly.
Explanation:
hope this helps
The equation below represents a chemical reaction. Zn (s) + 2HCl (aq) → ZnCl2 (aq) + H2 (g) A 5.00-g sample of zinc is added to hydrochloric acid. The amount of hydrochloric acid is sufficient to allow the zinc to react completely. What mass of hydrogen gas does this reaction produce? A. 0.0308 g B. 0.0771 g C. 0.121 g D. 0.154 g
Answer:
D
Explanation:
50. g of NaNO3 was dissolved in 1250 mL of water.
What is the molality of the solution? (Molar mass of
NaNO3 = 85 g/mol; Density of water = 1.00 g/mol)
m.
Your answer should be rounded to two significant figures. Do not
include units in your answer.
Answer:
.47
Explanation:
I just took a test that asked this exact same question and I got it right.
How many grams are in 5.5 moles of H2O
Answer:
99•g
Explanation:
Well, ONE mole of water has a mass of 18.01⋅g⋅mol−1. and 5.5⋅mol has a mass of approx. 99⋅g.
What is the power output of the stickman that pushes the box 5 meters in 3 seconds with a constant force of
12 N?
Answer:
20W
Explanation:
the power of qn object doing work w in a given time t is given by
p= w/t
Which lewis dot diagram shows an atom that needs 2 more electrons in its outermost shell?.
Answer:
Fluorine needs two more electrons on the outermost shell.
Explanation:
I'm in K12 too.
write the name of high quatity of coal
Answer:
Write the name of high quatity of coal
Explanation:
The weak ionization constant (Ka)
for HF is equal to:
[H3O][F]
[HFJ[H20]
[HF]
[F-][H30+]
Please help
Answer:
[tex]\displaystyle K_a = \frac{[\text{H$_3$O}^+][\text{F}^-]}{[\text{HF}]}[/tex]
Explanation:
Write the reaction of HF (a weak acid) with water:
[tex]\displaystyle \text{HF}_\text{(aq)} + \text{H$_2$O}_\text{($\ell$)} \rightleftharpoons \text{H$_3$O}^+_\text{(aq)} + \text{F}^-_\text{(aq)}[/tex]
Recall that the equilibrium constant expression for an equilibrium reaction is the product of the concentration of the products over the product of the concentration of the reactants raised to their respective coefficients.
The equilibrium constant expression for this equation will hence be:
[tex]\displaystyle K_a = \frac{[\text{H$_3$O}^+][\text{F}^-]}{[\text{HF}]}[/tex]
Note that pure solids and liquids are not included in the equilibrium expression.
In conclusion:
[tex]\displaystyle K_a = \frac{[\text{H$_3$O}^+][\text{F}^-]}{[\text{HF}]}[/tex]
The temperature of CI2 is changed from 836.06K to 625.06K.if it's new volume is 14.509L what was its original volume in liters
V1= 19.229L
Explanation:
V1/T1 = k
V1/836.06=14.509/625.06
V1/836.06= 0.023
V1 = 19.229L
The temperature of CI₂ is changed from 836.06K to 625.06K. If it's new volume is 14.509L then its original volume in liters was 19.4 L.
What is combined gas law?The combined gas law is the law of of gaseous state which is made by combination of Boyle's law, Charle's law, Avogadro's law and Gay Lussac's law.
It is a mathematical expression that relates Pressure, Volume and Temperature.
(P1 × V1)÷T1 = (P2 × V2)÷T2
We can also use the following relation-
PV = nRT
According to the question, Pressure is constant and we can write the formula as-
V1÷T1 = V2÷T2
T1 = 836.06 K
T2 = 625.06 K
V1 = ?
V2 = 14.509 L
V1 = 19.4 L
Therefore, The temperature of CI₂ is changed from 836.06K to 625.06K. If it's new volume is 14.509L then its original volume in liters was 19.4 L.
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A solution was made using NaOH, the pH of the solution was found to be 11.452. What is the concentration of the hydroxide ion, OH^- in this solution
Answer:
i think it is 0.002831392
Explanation:
pOH = 14 - 11.452 = 2.548
pOH = -log(OH)
2.548 = -log(OH)
10^(-2548) = 0.002831392
6. if a cross country runner travels at a speed of 10 mph and he runs for 2 hours, how many miles will he have run at the end of the 2 hours? calculating distance
Explanation:
distance = speed x time
distance = 10 x 2
distance = 20miles
hope that helps :)
If a cross country runner travels at a speed of 10 mph and he runs for 2 hours, 20miles he will have run at the end of the 2 hours.
What is distance?Distance is a description of how far apart two things or points are, either numerically or occasionally qualitatively. Distance can be used to describe a length in physics or to an estimate based on other factors in common usage.
The phrase is widely used metaphorically to refer to a measurement of the degree of distinction between two similar items since spatial intelligence is a rich source of implicatures in human understanding.
distance = speed x time
distance = 10 x 2
distance = 20miles
Therefore, 20miles is the distance.
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. If 3 moles of calcium reacts with 3 moles of oxygen, then a Which substance is the limiting reactant? b How many moles of calcium oxide are formed?
Let's see the balanced equation
[tex]\\ \rm\Rrightarrow 2Ca+O_2\longrightarrow 2CaO[/tex]
Hence
As moles are equal given
Ca should be the limiting reagent2mol Ca produces 2 mol CaO3mol Ca produces 3mol CaOCassiterite is an ore of a metal tin. What is an ore?
Answer:
Cassiterite is an ore of Sn.It is also called tinstone and has molecular formula of SnO
2 . It is heavy, metallic, hard tin dioxide that is the major ore of tin. It is colourless when pure, but brown or black when iron impurities are present.
Given the reaction below, which is the being oxidized? mg cl2 right arrow. mg2 2cl– 2ci– ci2 mg mg2
In the given decomposition reaction of MgCl₂, the oxidized species is magnesium.
What are oxidized species?Those species which goes through the oxidation process by the addition of oxygen or by the removal of hydrogen and electrons are known as oxidized species.
Given chemical reaction is:
MgCl₂ → Mg²⁺ + 2Cl⁻
In the above reaction oxidation of magnesium takes place as they losses electrons and reduction of chlorine takes place as they gain electrons.
Hence magnesium is the oxidized specie.
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Answer: B. Mg
Explanation:
E D G E
What is the [H+] in a solution with a pH of 9.92
A) 1.2x10^-10 M
B) 9.9x10^-7 M
C) 4.9x10^-5 M
D) 1.1x10^-9 M
Answer:
Total flow: = 1000 cfm = 4.7 x 10 ml/sec. Stack Ht.: 2.7m (9 ft) ... 1.2x10-8. 6.4x10 7. C-14. 4.3x10 7. 1.0x10 5. 2.0x10 8. 1.1x10-8. Na-22. 1.3x1i dont know how to explain it
How many liters of 1.0 M NaCl solution are needed to react with 5 M of the solute
That should be 5mols of solute
Now
Let that volume be V
Molarity=Moles of solute/Volume in L1M=5/VV=5LThe question is given in the image below
A gas has a volume of 22. 6L at 3. 6 atm. What is the pressure of the gas at 44. 3L
Answer:
1.837 atm
Explanation:
According to Boyle's Law:
[tex]V_{1} P_{1} = V_{2}P_{2}[/tex]
(22.6L) (3.6atm) = (44.3L) (x)
x = 81.36 /44.3
x = 1.837 atm
This is because Volume and Pressure are inversely proportional. If one increases the other has to decrease.
What is the name of this hydrocarbon? a skeletal model has 2 central carbons bonded to c h 3 at each end, and at the left of the 2 central carbons. 3-isopentane 2-methylbutane 3-methylbutane 1,2-methylpropane
The name of the given hydrocarbon in which 2 central carbon atoms with additional 3 methyl groups is 2-methylbutane.
What are hydrocarbons?Hydrocarbons are the organic compounds which are made up of by the combination of hydrogen and carbon atoms.
According to the question desired structure is attached below where:
2 and 3 number shows the central carbon atoms which are present in the hydrocarbon.1 and 4 number shows the methyl groups that are attached at each end.One extra methyl group is attach on the left side of 2nd central carbon atoms.Hence required hydrocarbon is 2-methyl butane.
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Answer:
B. 2-methylbutane
Explanation:
Correct on Edge 2022!!!
Good luck everyone, you got this! Have a great day!
Which of the following formulas should be classified as an acid?
O Na₂SO4
O NaHCO3
O NaOH
O H₂SO4
Answer:
D) H₂SO4 is an acid
Explanation:
Please mark branliest
H[tex]_2[/tex]SO[tex]_4[/tex] is the chemical formula that should be classified as an acid. Therefore, the correct option is option D.
What is an acid?Any substance that tastes acidic when dissolved in water, alters the colour of some indicators, reacts with the some metals to release hydrogen, reacts using bases to produce salts, and stimulates some chemical reactions is considered to be an acid. The inorganic chemicals referred to as being mineral acids sulfuric, nitrous, hydrochloric, or phosphoric acids are examples of acids.
The phenolic, sulfonic, and carboxylic acid groups of organic molecules. These chemicals contain one or maybe more hydrogen atoms, which are discharged into highly charged hydrogen ions when they are in solution. H[tex]_2[/tex]SO[tex]_4[/tex] is the chemical formula that should be classified as an acid.
Therefore, the correct option is option D.
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Define the main temperature, precipitation, location and soil characterisitcs of the following Biomes.
1. Tundra
2. Temperate Grassland
3. Tropical Rainforest
Answer:
Tundra :a vast, flat, treeless Arctic region of Europe, Asia, and North America in which the subsoil is permanently frozen.
Temperate grasslands are characterized as having grasses as the dominant vegetation.
Tropical rainforests are rainforests that occur in areas of tropical rainforest climate in which there is no dry season – all months have an average precipitation of at least 60 mm – and may also be referred to as lowland equatorial evergreen rainforest.
Write balanced chemical equations for:
a) coke + oxygen --> carbon dioxide
b) carbon dioxide + coke --> carbon monoxide
Answer:
a. C (s)+ 02(g)---->C02(g)
b. CO2(g) +C(s)--->2CO(g)
Explanation:
This reaction is the method of purification of some precious metals such a iron(Fe) in it's ore. a.The carbon(coke) is oxidized to carbon (IV) oxide
b. the carbon dioxide gas is reduced with the same carbon to produce carbon(II) oxide.
Which of the following is an oxidation-reduction reaction? so2(g) h2o(l) right arrow. h2so3(aq) caco3(s) right arrow. cao(s) co2(g) ca(oh)2(s) h2co3(l) right arrow. caco3(aq) 2h2o(l) c6h12o6(s) 6o2(g) right arrow. 6co2(g) 6h2o(l)
The reaction which shows oxidation and reduction simultaneously is C₆H₁₂O₆(s) + 6O₂(g) → 6CO₂(g) + 6H₂O(l).
What are redox reactions?Those reaction in which oxidation as well as reduction of substances takes place simultaneously will known as redox reactions.
SO₂(g) + H₂O(l) → H₂SO₃(aq)CaCO₃(aq) → CaO(s) + CO₂(g)Ca(OH)₂(s) + H₂CO₃(l) CaCO₃(aq) + 2H₂O(l)Above reaction are not the redox reactions as in these reaction oxidation and reduction simultaneously not takes place.
C₆H₁₂O₆(s) + 6O₂(g) → 6CO₂(g) + 6H₂O(l)In the above reaction reduction of oxygen takes place as its oxidation state changes from 0 to -2, and at the same time oxidation of carbon takes place as its oxidation state changes from 0 to +4.
Hence correct option is (4).
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Answer:
correct option is (4).
Explanation:
A mixture of three gases (N2, Ar, and O2) at 2.6 atm is found to contain 23% N2 and 3.0% Ar by mass. What is the partial pressure of O2
Given that the mixture of the three gases has a pressure of 2.6 atm, the partial pressure of O₂ is 1.924 atm
Dalton's law of partial pressureThis law states that at contact temperature, the total pressure of a mixture of gases is equal to the sum of the partial pressure exerted by each gas. Mathematically, it is expressed as
Total pressure = partial pressure of A + partial pressure of B
How to determine the partial pressure of O₂Percentage of N₂ = 23%Percentage of Ar = 3%Percentage of O₂ = 100 – (23 + 3) = 74%Total pressure = 2.6 atmPartial pressure of O₂ =?Partial pressure of O₂ = (percentage of O₂) × total pressure
Partial pressure of O₂ = 74% × 2.6
Partial pressure of O₂ = 0.74 × 2.6
Partial pressure of O₂ = 1.924 atm
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Why do the protons identify the element and not the electrons or the
neutrons?
What happens to climate and weather over a summer?
Answer:
summers get hotter, and it can get more sticky or humid sometimes.
Explanation:
think of the seasons and the tempatures.
A film crew is setting up a scene to show the effects of a blast wave on nearby cars. Why do you think the cars are hanging from cables?
The cars are hanging from cables so that there is presence of more medium of propagation to make it look real.
What is a Blast wave?This is referred to as a violent propagating disturbance, produced by an explosion in air.
Hanging the cars in the air will ensure an accurate description of the effect of the blast wave on them.
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