Answer:
Carbon is a nonmetal which has two mains; diamond and graphite.
Carbon is found in a solid state.
Explanation:
Faces:
13. Explain why a solution containing both NH3 and NH4Cl is less basic than a solution
containing only NH3 of the same concentration.
Answer:
In a solution containing ammonia solution and ammonium chloride, ammonia hydrolyses in water to produce hydroxyl ions.
NH3 +H2O → NH4+ + OH-
Ammonium chloride ionises in the solution to produce ammonium ions and chloride ions where the ammonium ions undergo hydrolysis to produce more ammonia solution.
[tex]NH _{4} Cl→NH _{4} {}^{ + } + Cl {}^{ - } [/tex]
The barometer at an indoor pool reads 105.00 kPa. If the temperature in the room is 26c, what is the patial pressure of the "dry" air??
a. 30.88 kPa
b. 101.60 kPa
c. 108.40 kPa
d. 357.00 kPa
Answer:
Option B. 101.60 KPa
Explanation:
From the question given above, the following data were obtained:
Total pressure (Pₜ) = 105.00 KPa
Partial pressure of wet gas (Pᵥᵥ) at 26 °C = 3.4 KPa
Partial pressure of dry gas (Pₔ) =?
Total pressure = partial pressure of dry gas + partial pressure of wet gas
Pₜ = Pₔ + Pᵥᵥ
105 = Pₔ + 3.4
Collect like terms
105 – 3.4 = Pₔ
Pₔ = 101.60 KPa
Therefore, the partial pressure of the dry gas is 101.60 KPa
Which is being developed by chemists to supplement fossils fuels?
Answer:
bio diesel
Explanation:
bio diesel is a recent development to supplement fossil fuels
Answer:
Which is being developed by chemists to supplement fossils fuels is - Biodiesel.
Explanation:
Glad that I could help. Have a great day.
What is the concentration of a NaCl solution that is prepared by dissolving 14.61 g of NaCl in 500.0 mL of water
Answer:
0.029 g/mL or 0.5 M
Explanation:
The concentration in g/mL is:
14.61 g / 500.0 mL = 0.029 g/mLAs for calculating the molar concentration, first we convert 14.61 g of NaCl to moles, using its molar mass:
14.61 g ÷ 58.44 g/mol = 0.25 molThen we divide the number of moles by the volume in liters:
500 mL / 1000 = 0.5 LMolarity = 0.25 mol / 0.5 L = 0.5 MBased on the trend in the table, hypothesize what the volume of the sample at 400K would be.
a. 247 cm^3
b. 285 cm^3
c. 297 cm^3
d. 400 cm^3
Answer: The volume of sample at 400 K is [tex]285cm^3[/tex]
Explanation:
Charles' Law: This law states that volume is directly proportional to the temperature of the gas at constant pressure and number of moles.
[tex]V\propto T[/tex] (At constant pressure and number of moles)
[tex]{\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]
where,
[tex]V_1[/tex] = initial volume of gas = [tex]257cm^3[/tex]
[tex]V_2[/tex] = final volume of gas = ?
[tex]T_1[/tex] = initial temperature of gas = 360 K
[tex]T_2[/tex] = final temperature of gas = 400 K
Putting in the values we get:
[tex]{\frac{257}{360}=\frac{V_2}{400}[/tex]
[tex]V_2=285cm^3[/tex]
Thus volume of sample at 400 K is [tex]285cm^3[/tex]
Answer:
D
Explanation: 400 cm
The molecule with only single covalent bonds is _. (C) *
CO2
СО
CI2
ON2
Answer:
CO (carbon monoxide)
Explanation:
CH4 + 2O2 —> 2H2O + CO2
How many moles of carbon dioxide are obtained when 20. moles of methane are
burned?
Answer: 20 mol CH4 x 1CO2 / 1CH4 = 20mol CO2
Answer: 20mol CO2
Explanation:
An oxygen molecule is adsorbed on a patch of surface (see sketch at right). This patch is known to contain adsorption sites. The molecule has enough energy to move from site to site, so it could be on any one of them. Suppose part of the surface becomes inaccessible, so that only adsorption sites are now available for the molecule. Calculate the change in entropy. Round your answer to significant digits, and be sure it has the correct unit symbol.
This question is incomplete, the complete question is;
An oxygen (O₂) molecule is adsorbed on a patch of surface (see sketch at right). This patch is known to contain 324 adsorption sites.
The (O₂) molecule has enough energy to move from site to site, so it could be on any one of them.
Suppose part of the surface becomes inaccessible, so that only 400 adsorption sites are now available for the molecule.
Calculate the change in entropy.
Round your answer to 3 significant digits, and be sure it has the correct unit symbol.
Answer:
the change in entropy is 2.91 x 10⁻²³ J/K
Explanation:
Given the data in the question;
For an ideal gas,
Entropy of a molecule, S = K[tex]_B[/tex] ln(W)
where K[tex]_B[/tex] is Boltzmann constant (1.38065 x 10⁻²³ J/K)
W is Equivalent micro states of the molecule
( W[tex]_{initial}[/tex] = 324 and W[tex]_{final}[/tex] = 400 )
S[tex]_{final}[/tex] - S[tex]_{initial}[/tex] = K[tex]_B[/tex] ln(W[tex]_{final}[/tex]) - K[tex]_B[/tex] ln(W[tex]_{initial}[/tex] )
ΔS = K[tex]_B[/tex] ln(W[tex]_{final}[/tex] / W[tex]_{initial}[/tex] )
we substitute
ΔS = (1.38065 x 10⁻²³ J/K) × ln( 400 / 324 )
ΔS = 2.9093 x 10⁻²³ J/K
ΔS = 2.91 x 10⁻²³ J/K
Therefore, the change in entropy is 2.91 x 10⁻²³ J/K
A good conductor:
A. transfers heat quickly
B. transfers heat slowly
C. does not transfer heat at all
D. always stays the same temperature
Answer:
A. Transfers heat quickly25. Classify the following as element, compound or mixture and explain how do you know?
a) NaCI + H2O
b) C2H4O
c) O2
d) Co
e) CO
f) H2 + O2
g) H2O2
Answer:
A Mixture
B compound
C element
D element
E. Compound
F mixture
G compound
Explanation:
A compound is formed from the chemical reaction between two or more atoms
A Mixture is formed when two or more elements are physically combined
An element is any substance that contains only one kind of an atom
How does the order of elements in the name relate to the order of elements in the
formula?
Softening of water is the application of
Answer:
Water softening is the process of removing the dissolved calcium and magnesium salts that cause hardness in water
Explanation:
Which diagram shows how CH3Br and OH must collide in order to react and form CH2OH? (Marking brainliest!)
Answer:
Its B
Explanation:
I just took the quiz.
When [tex]CH_{3} Br[/tex] and OH collide in order to react and form [tex]CH_{3} OH[/tex] , such reaction will be best represented by diagram (B).
What is reaction?A chemical reaction would be a procedure that causes one group of chemical components to change chemically into another. In a chemical reaction, one or even more substances also known as reactants would be changed into one or more additional materials known as products. Chemical elements and chemical compounds make up substances.
What is collide?A colloid would be a mixture wherein the component made up of insoluble particles that are scattered at a microscopic scale is suspended within another component.
When
[tex]CH_{3} Br + OH[/tex] → [tex]CH_{3} OH + Br[/tex].
By the Collison of methyl bromide with OH ion then methyl alcohol will be formed.
Therefore, when [tex]CH_{3} Br[/tex] and OH collide in order to react and form [tex]CH_{3} OH[/tex] , such reaction will be best represented by diagram (B).
Therefore, the correct answer will be option (B).
To know more about Collison
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A compound is found to contain 59.94 % carbon, .44 \% hydrogen , and 26.62 % oxygen by mass. To answer the question, enter the elements in the order presented above.
QUESTION 1 The empirical formula for this compound is
calculate the perimeter of a rectangle of length 8cm and breath 5/2cm
Answer:
21
Explanation:
P=2(l+w)=2·(8+2.5)=21
Hope this helps :)
If a buffer solution is 0.130 M in a weak acid (K_a = 1.7 x 10^-5) and 0.590 M in its conjugate base, what is the pH?
PH
=
____MgCl2 (s) + ____Li2CO3 (s) → ____MgCO3 (s) + ___LiCl (aq)
12 MgC12- 56 Li2CO3- s --> 18 MgCO3 (s) + 73 LiCI (aq)
hope this helped
words that mean the same thing
decrease,
diminish,
dwindle
Answer:
Subside
Explanation:
Answer:
lower, reduce, decline
Explanation:
Water is stored in the _________________________ until it is used by the cell.
Answer:
cell sap :)
Explanation:
Answer:
well
Explanation:
`1. the products in a reactions will always have...
(a) the same total mass as the reactants
(b)the same number of molecules as the reactants
(c) less mass than the reactants
(d) a greater number of molecules than the reactants
Answer:
a
Explanation:
as the law of conservation of matter (mass) states: matter can not be created nor destroyed but can transform from a form to another.
since the conversion of mass to energy can not be done except in nuclear reactions via (E= mc2). normal chemical equations must be balanced to achieve the law.
what is the kg of the net force is 30 N and the acceleration is 6 m/s 2
Answer:
5kg
Explanation:
Use the law: F=MA
F= force which is newton
M= mass which is kg
A= acceleration which is [tex]m/s^{2}[/tex]
Please help due tofay
Answer:
I only know the answer to the second one, The bond that occurs between two metal atoms is a metallic bond
In an extraction experiment similar to your expt. 4, you attempt to separate 2-naphthol from cyclohexane, both of which are dissolved in ether. You attempt the separation by extracting the organic layer with a Ì´5% NaOH (aq) solution (made by adding 5.00 g of NaOH to every 100 mL of water). Assuming that all of the base present in the aqueous solution reacts with the phenol during your extractions, what is the minimum volume of the aqueous NaOH solution needed to deprotonate 20.0 g of 2-naphthol in order to extract it into the water layer? Clearly show all calculations. After removal of the phenol from the ether layer, only cyclohexane would remain. Concisely explain how you could efficiently isolate relatively pure cyclohexane from the ether layer.
Answer:
[a]. 108 mL.
[b].
1. use HCL in washing for the neutralization of NaOH.
2. Wash with water.
3. make use of MgSO4 to remove water traces.
4. Evaporate to get the pure cyclohexane
Explanation:
The chemical equation for the reaction between 2-naphthol and Sodium hydroxide is given below as:
C₁₀H₈O + NaOH --------------------------------------------------> C10H7O⁻ Na⁺ + H₂O.
The C10H7O⁻ Na⁺ is the aqueous phase.
The molarity of Sodium Hydroxide is = [ (mass of sodium hydroxide ) ÷ molar mass sodium hydroxide × volume] × 1000.
The molarity of sodium hydroxide = [ (5/40) × 100] × 1000 = 1.25 M.
The number of moles of 2-naphthol = mass / molar mass = 20 / 144.17 = 0.138 moles.
Recall that, the formula for the number of moles = concentration × volume. Therefore, the volume of sodium hydroxide is given below as:
Volume of sodium hydroxide = the number of moles of sodium hydroxide ÷ concentration of sodium hydroxide = 0.138 ÷ 1.25 = 0.108L = 108 mL.
In order to efficiently isolate relatively pure cyclohexane from the ether layer, the following process must be followed:
1. use HCL in washing for the neutralization of NaOH.
2. Wash with water.
3. make use of MgSO4 to remove water traces.
4. Evaporate to get the pure cyclohexane
Match the procedural step to its purpose by dragging each step in the written procedure for the Fischer esterification of benzoic acid with methanol in the presence of mineral acid into the appropriate box. Purpose: Flat-bottomed flasks transfer heat in an uneven fashion, and may fracture if heated strongly. Procedure: Purpose: Methanol, which is used as a reagent and solvent, is flammable. Prodedue: Purpose: The unreacted carboxylic acid was neutralized under mild conditions. Procede: Purpose: Water needs to be removed before the liquid ester product is collected. Procedure:
Answer:
Explanation:
The task in this question is to match the right procedure to its purpose. It explains the procedure for the preparation of Fischer Esterification. Fischer Esterification Mechanism should incorporate the ceaseless expulsion of water from the framework or the use of a huge amount of excess alcohol since the general reaction is reversible. Fischer Esterification act as an organic reaction that is utilized to change over carboxylic acids within the sight of excess alcohol and a solid corrosive catalyst (acid) to give an ester as the eventual outcome.
Procedure Purpose
[tex]\text{Flat bottomed flask transfer}\\ \\ \text{ heat in an uneven fashion and } \\ \\ \text{ may fracture if heated strongly}[/tex] [tex]\text{The reagents were added to a} \\ \\ \text{round bottom flask prior to the }\\ \\ \text{reaction being heated under reflux}[/tex]
[tex]\text{Methanol which used as a reagent} \\ \\ \text{and solvent is flammable}[/tex] [tex]\text{The solution of benzoic acid and }\\ \\ \text{methanol was heated on steam bath}[/tex]
[tex]\text{The unreacted carboxylic acid was} \\ \\ \text{neutralized under mild conditions}[/tex] [tex]\text{The reaction mixture was washed} \\ \\ \text{ with sodium bicarbonate solution}[/tex]
[tex]\text{Water needs to be removed before the} \\ \\ \text{ liquid ester product was collected}[/tex] [tex]\text{Magnesium sulphate is added to the} \\ \\ \text{ dichloromethane layer before} \\ \\ \text{ the solvent is distilled off}[/tex]
The Law of Conservation of Mass is a scientific rule that says:
A
mass can be made or lost during a chemical reaction
B
mass is never made or lost during a chemical reaction
C
all matter will decompose during a chemical reaction
D
baking a cake is not actually a chemical reaction
Answer:
B - Mass is never made or lost during a chemical reaction
Explanation:
This is, quite frankly, the Law of Conservation of Mass. :)
B - Mass is never made or lost during a chemical reaction
Explanation:
This is, quite frankly, the Law of Conservation of Mass. :)
Explanation:
an object with a mass of 10.0 kg is moving at a speed of 5.00m/s. The kinetic energy of the mass is
a. 50.0j
b. 2.00j
c. 125j
d. 250j
The mass and velocity of an object determines its kinetic energy. The kinetic energy of the substance with mass of 10 kg and speed of 5 m/s is 125 J. Hence, option b is correct.
What is kinetic energy ?Kinetic energy of an object is generated by virtue of its motion. The kinetic energy is dependent to the mass and speed of the object by the expression written below;
Ke = 1/2 mv²
Therefore, as the mass or speed or both increases kinetic energy increases. When an object starts moving its potential energy gets converted to kinetic energy.
Given that mass = 10 Kg
speed = 5 m/s
then Ke = 1/2 10 kg × 5 m/s × 5 m/s = 125 J
Therefore, the kinetic energy of the object is 125 J, option c is correct.
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50 points
In the image below, light is displayed as particles called photons. Research to find out what photons are and then explain in your own words why they can be useful for modeling light.
Answer:
A photons is a particle representing a quantum of light or other electromagnetic radiation. A photon carries energy proportional to the radiation frequency but has zero rest mass.
Explanation:
Light consists of packets of energy (photons) that can only interact with the atoms and molecules of matter by being absorbed or emitted in discrete units. ... Photons carry momentum and energy like particles, but they also have a frequency and a wavelength like a sinusoidal wave. Thanks to photons we know that all quantum particles have both the properties of waves and particles. I hope it helps✌️
thermal energy _____ as temperature increases
A. increases
B. decreases
C. remains constant
D. contracts
A sample of marble has a volume of 6 cm and a density of 2.76 g/cm3. What is its mass?
16.56 g
8.76 g
2.17 g
0.46 g
Answer:
16.56g
Explanation:
d=m/v
2.76=m/6
2.76*6=m
16.56=m
m=16.56g
According to an energy pyramid model, which trophic level is expected have the largest biomass in land ecosystems ?
Answer:
According to an energy pyramid model, Producer is expected have the largest biomass in land ecosystems
Explanation:
In a trophic level, the producers possess the largest biomass. With the increasing trophic level, the biomass reduces. Hence, the producers at the base have high biomass.
On terrestrial ecosystem, the producers are the plants and trees and hence the greatest biomass exists in the plants and trees.
Hence, in an energy pyramid model, Producer is expected have the largest biomass in land ecosystems