Answer:
as mass and the square of speed is directly proportional to the the kinetic enegry so, more there will be mass and speed there will be more kinetic enegry.
In the hydrogenation of oils the catalyst used is:
A. Pt
B. Ni
C. Fe
D. V2O5
Answer:
B
Explanation:
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What is the mass of 15% of solution of lime that is formed by dissolving 30g of calcium hydroxide in water?
Answer:
200 grams is the mass of 15% of the solution of lime that is formed by dissolving 30g of calcium hydroxide in water.
Explanation:
Mass of solution = M
Mass percentage of the solution of lime = 15%
Mass of lime or calcium hydroxide = m = 30 g
The Formula of mass percentage is given as :
[tex]m/m\%=\frac{m}{M}\times 100[/tex]
On substituting the values in ab above formula :
[tex]15\%=\frac{30 g}{M}\times 100[/tex]
[tex]M=\frac{30 g}{15}\times 100=200 g[/tex]
200 grams is the mass of 15% of the solution of lime that is formed by dissolving 30g of calcium hydroxide in water.
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Which will change will cause the gravitational force between a baseball and a soccerball
Which of the following is a characteristic property of the halogen? A. They are very reactive B. They are very stable C. They are metals D. They are all gases
Answer:A
Explanation:
They are very reactive is a characteristic property of halogen.
Hence, Option (A) is correct answer.
What is Halogen ?Halogens are non metallic elements in periodic table. It belongs to group 17 in the periodic table. Halogen family consists six elements that is Fluorine (F), Chlorine (Cl), Bromine (Br), Iodine (I), Astatine (At) and Tennessine (Ts).
What are the characteristics property of halogen ?They are nonmetals. Halogens have 7 valence electrons. They are highly reactive with alkaline earth metal and alkali metals. Halogens are not stable.Thus, from the above conclusion we can say that They are very reactive is a characteristic property of halogen.
Hence, Option (A) is correct answer.
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When 12 g of methanol (CH3OH) was treated with excess oxidizing agent (MnO4-), 14 g of formic acid (HCOOH) was obtained. Using the following chemical equation, calculate the percent yield. (The reaction is much more complex than this; please ignore the fact that the charges do not balance.)
3CH3OH + 4MnO4- ----> 3HCOOH + 4MnO2
(a) 100%
(b) 92%
(c) 82%
(d) 70%
(e) 55%
Answer:
(c) 82%
Explanation:
Using the chemical reaction:
3CH₃OH + 4MnO₄⁻ → 3HCOOH + 4MnO₂ + 4e⁻
3 moles of methanol produce 3 moles of formic acid (Reaction 1:1)
To find the percent yield we need to calculate theoretical yield of the reaction when 12g of methanol (Molar mass: 32.04g/mol) are reacting, thus:
12g ₓ (1mol / 32.04g) = 0.3745 moles of methanol are in 12g.
As 1 mole of methanol produce 1 mole of formic acid, assuming a 100% of yield in the reaction (Theoretical yield) moles produced of formic acid are 0.3745 moles.
Using molar mass of formic acid (46.03g/mol), mass of the acid in 0.3745moles are:
0.3745 moles ₓ (46.03g/mol) = 17.2g of formic acid are theoretical yield
Percent yield is calculated as:
(actual yield / Theoretical yield) × 100
As actual yield of the reaction is 14g. Theoretical yield is:
(14g / 17.2g) × 100 = 81.2% ≈ 82%
Right answer is:
(c) 82%The percentage yield of the reaction is 82%
The correct answer to the question is Option C. 82%
We'll begin by writing the balanced equation for the reaction.
3CH₃OH + 4MnO₄⁻ → 3HCOOH + 4MnO₂ + 4e⁻
Molar mass of CH₃OH = 12 + (3×1) + 16 + 1 = 32 g/mol
Mass of CH₃OH from the balanced equation = 3 × 32 = 96 g
Molar mass of HCOOH = 1 + 12 + 16 + 16 + 1 = 46 g/mol
Mass of HCOOH from the balanced equation = 3 × 46 = 138 g
From the balanced equation above,
96 g of CH₃OH reacted to produce 138 g of HCOOH
Next, we shall determine the theoretical yield of HCOOH.From the balanced equation above,
96 g of CH₃OH reacted to produce 138 g of HCOOH.
Therefore,
12 g of CH₃OH will react to produce = (12 × 138)/96 ≈ 17g of HCOOH.
Finally, we shall determine the percentage yield.Actual yield of HCOOH = 14 g
Theoretical yield of HCOOH = 17 g
Percentage yield =?Percentage yield = Actual / Theoretical × 100
Percentage yield = 14/17 × 100
Percentage yield ≈ 82%The correct answer to the question is Option C. 82%
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An element of Group Il loses two electrons in the process of a chemical combination. What is its ionic charge?
A. +2
B. -2
Answer:
A. +2
Explanation:
When neutral atom loses electrons, number protons(+) becomes more than number of electrons(-), so charge of ion is positive.
someone help PLSSSS. i’ve asked this question like 3 times already Determine the number of lone pair electrons on each H in NH3. Z of N= 7, H=1 A. 0 B. 3 C. 1 D. 2
Answer:
The answer is option B.
3.
Hope this helps you
The proof that ch4 is a weak acid
Answer: because ch4 is not considered a acid they said it is too weak
Explanation:
How much water should be added to 12 ml of alcohol to obtain 12% alcohol solution?
Answer:
88 mL of water.
Explanation:
Data obtained from the question include the following:
Volume of alcohol = 12 mL
Percentage of alcohol = 12%
Volume of water =..?
We can thus, obtain the volume of water needed to make 12% of the alcohol solution as follow:
Percentage of the solution = 100%
Percentage of alcohol = 12%
Percentage of water =?
Percentage of water = percentage of solution – percentage of alcohol
Percentage of water = 100 – 12
Percentage of water = 88%
Since 12% of alcohol is equivalent to 12 mL of alcohol, therefore 88% of water will also be equivalent to 88 mL.
Therefore, 88 mL of water is needed to make 12% of alcohol.
first ionization energy
Answer:
The first ionization energy is defined as
Energy which is required to pull out one mole of the outermost shell's electrons in a neutral atom from one mole of gaseous atoms to produce 1 mole of gaseous ions each with a charge of 1+.[tex]A\to A^++ e^{-}[/tex] , where A is any neutral atom.In the periodic table, Its value decreases from top to bottom in groups and increases from left to right across a particular period. Helium has the largest first ionization energy.Francium has one of the lowest.4.Acrylic fibres are also known as
a)Terry cot
b)Orlon
c)Polyester
d)None of these
Answer:
B
Explanation:
DuPont created the first acrylic fibers in 1941 and trademarked them under the name Orlon.
Which refers specifically to a heated solution that holds more dissolved solution than it can hold at a lower temperature? supersaturated undersaturated heterogeneous homogeneous
Answer:
A. Supersaturated
Explanation:
i got it right on edge 2021
The heated solution that holds more dissolved solution than it can hold at a lower temperature is supersaturated solution. Therefore, option A is correct.
What is supersaturated solution ?A solution that contains more solvent than the typical amount that can dissolve at a specific temperature is said to be supersaturated. By introducing a tiny solute crystal known as a seed crystal, the excess dissolved solvent in a super-saturated solution can begin to recrystallize.
A solution that contains more solvent than the typical amount that can dissolve at a specific temperature is said to be supersaturated. A solution is considered supersaturated if it contains more solute than is necessary to saturate it.
A solution that contains more solute than it can hold at a specific temperature is said to be supersaturated. Usually, raising a solution's temperature causes more particles to dissolve, increasing the solute concentration.
Thus, option A is correct.
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10g of sugar is dissolved by water to make 200g of solution of sugar. What is the percent by mass of the solution?
Explanation:
In sugar solution 200 g has sugar 10 g
In sugar solution 100 g has sugar 10/200 × 100
= 5 %w/w
Modern atomic theory states that atoms are neutral. How is this neutrality achieved? (3 points) Select one: a. Equal number of neutrons and protons b. Equal number of protons and electrons c. More electrons than protons d. More neutrons than electrons
Answer:
The answer is option B.
Equal number of protons and electronsHope this helps you
Answer:
equal number of electrons and protons
Explanation:
electron is negatively charged and proton is positively charged for an atom to stay neutrality # of electrons and protons must be equal.
Name one way chemicals can help the environment
Energy storage and transport. Chemical energy transport.
Answer:
to clean the water
Explanation:
Describe how u would separate a mixture of salt , sand and iodine into different components. please help i will give a brainliest for this . PLEASE HELP?
to remove iodine sublime
to remove sand filter
to remove water evaporate
Explanation:
1. put the mixture in a beaker
2.Heat the mixture using a watch glass filled with cold water, the iodine will sublime at the base of the watch glass.
3.Add water to sand and salt. Stir for salt to diffuse in the water
4.Filter sand from the solution using a filter paper
5.evaporate the remaining water to remain with Salt crystals.
A drug problem can quickly consume A)a small portions of a person income B)the bulk of a person income C)a person excess income
Answer:
b
Explanation:
a drug problem consumes the bulk of a persons income because drugs are expensive to buy
A drug problem can quickly consume the bulk of a person income
What is a drug problem?A drug is any chemical substance that causes a change in an organism's physiology or psychology when consumed. Drug abuse or substance abuse refers to the use of certain chemicals for the purpose of creating pleasurable effects on the brain.
Drug use can have significant and damaging short-term and long-term effects. Taking some drugs can be particularly risky, especially if you take high doses or combine them with other drugs or alcohol.
People of any age, sex or economic status can become addicted to a drug. Certain factors can affect the likelihood and speed of developing an addiction.
The best way to prevent an addiction to a drug is not to take the drug at all. If your doctor prescribes a drug with the potential for addiction, use care when taking the drug and follow the instructions provided by your doctor. Thus you can save your income.
The correct answer is option B.
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How do you find the amount of electrons for any element?
Answer:
If you know the number of protons and neutrons you have to simply subtract the number of neutrons by number of protons the answer will be number of neutron
Explanation:
Answer:
We can find the amount of electrons through its Atomic number and with the help of electronic configuration
Sulphuric acid, also called ‘king of chemicals' has the formula H2SO4. Its appearance is different from that of hydrogen and sulphur. Give two other reasons why sulphuric acid is a compound and not a mixture.
Explanation:
Before proceeding to answering the question, we have t understand what we mean by both mixture and compound.
A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions and colloids.
A compound on the other hand is a chemical substance composed of many identical molecules composed of atoms from more than one element held together by chemical bonds.
The two other reason why H2SO4 is a compound and not a mixture are;
1) The components which are Hydrogen, Sulphur and Oxygen cannot be separated by physical means.
2) It has a constant melting and boiling point.
TIMED TEST PLS HELP (will give BRAINLIEST) According to some scientists, which is a cause of global warming? PICK ONLY ONE A) decrease of nitrous oxide B) increase in cloud cover C) decrease of methane gas D) increase in carbon dioxide
Answer:
D : increase in carbon dioxide
Answer: the Answer is D, 100% sure
increase in carbon dioxide
Explanation: i did the GED school and got it right
how do we solve a WEAK/STRONG acid
Answer:
Strong acids completely dissociate into their ions in water, while weak acids only partially dissociate. There are only a few (7) strong acids, so many people choose to memorize them. All the other acids are weak.
Explanation:
Weak acids. Explaining the term "weak acid" A weak acid is one which doesn't ionise fully when it is dissolved in water. Ethanoic acid is a typical weak acid. It reacts with water to produce hydroxonium ions and ethanoate ions, but the back reaction is more successful than the forward one.
A strong acid is an acid which dissociates completely in water. That is, all the acid molecules break up into ions and solvate (attach) to water molecules. Therefore, the concentration of hydronium ions in a strong acid solution is equal to the concentration of the acid.
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Need help ASAP!!!! what is the value (angle) for the C=C=O bond in Ketene i.e. CH2=C=O
Answer:
[tex]180^\circ[/tex] by the VSEPR theory.
Explanation:
This question is asking for the bond angle of the [tex]\rm C=C=O[/tex] bond in [tex]\rm H_2C=C=O[/tex]. The VSEPR (valence shell electron pair repulsion) theory could help. Start by considering: how many electron domains are there on the carbon atom between these two bond?
Note that "electron domains" refer to covalent bonds and lone pairs collectively.
Each nonbonding pair (lone pair) of valence electrons counts as one electron domain.Each covalent bond (single bond, double bond, or triple bond) counts as exactly one electron domain.For example, in [tex]\rm H_2C=C=O[/tex], the carbon atom at the center of that [tex]\rm C=C=O[/tex] bond has two electron domains:
This carbon atom has two double bonds: one [tex]\rm C=C[/tex] bond and one [tex]\rm C=O[/tex] bond. Even though these are both double bonds, in VSEPR theory, each of them count only as one electron domain. Keep in mind that there are only four valence electrons in each carbon atom. It can be shown that all four valence electrons of this carbon atom are involved in bonding (two in each of the two double bonds.) Hence, there would be no nonbonding pair around this atom.In VSEPR theory, electron domains around an atom repel each other. As a result, they would spread out (in three dimensions) as far away from each other as possible. When there are only two electron domains around an atom, the two electron domains would form a straight line- with one domain on each side of the central atom. (To visualize, consider the three atoms in this [tex]\rm C=C=O[/tex] bond as three spheres on a stick. The central [tex]\rm C[/tex] atom would be between the other [tex]\rm C[/tex] atom and the [tex]\rm O[/tex] atom.)
This linear geometry corresponds to a bond angle of [tex]180^\circ[/tex].
determine the type of the following chemical reaction: Mg(s) + 2HCl(aq)——-> H2(g) + MgCl2(aq) a. single replacement reaction b. decomposition reaction c. combination reaction d. double replacement reaction
Answer:
a. single replacement reaction
Explanation:
Mg(s) + 2HCl(aq)——-> H2(g) + MgCl2(aq)
Mg replaces H, so this is a single replacement reaction.
How much energy does a 185 nm wave of light have? (The speed of light in a
vacuum is 3.00 x 108 m/s, and Planck's constant is 6.626 x 10-34 Jos.)
A. 1.07 x 10-18 J
B. 8.38 x 1034j
C. 9.31 x 1017 J
D. 3.68 x 10-32 J
O
Answer: A. 1.07 x 10∧ -18 J
Explanation:
The energy can be calculated by using this relation; E = hc / ∧
Where E = energy
h = Planck's constant = 6.626 x 10-34joules
c = speed of light = 3.00 x 10∧8 m/s
∧ = wavelenght = 185 nm = 185 x 10∧ -9m
Therefore; E= hc / ∧
= (6.626 x 10-34 j/s) x ( 3.00 x 10∧8 m/s) / 185 x 10∧ -9m
= 1.987 x 10 ∧ -25 / 185 x 10∧ -9m
= 1.07 x 10∧ -18 J
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Question: Aluminum is an element. Which best describes what makes up a sample of aluminum? one kind of atom two different kinds of atoms all carbon-based atoms a carbon atom and non-carbon atoms
Answer:
The answer to this is A. One kind of atom
Explanation:
The other options make no sense whatsoever. But enjoy.
I hope this helped.
Answer:
A. One kind of atom
Explanation:
I need a help from this question!!
Answer:
B
Explanation:
Please take a look at the picture attached for the drawings and structures.
C2H4 is a alkene (C-C double bond). When steam (water) is added, it turns into an alcohol, where the double bond breaks and a (-OH) functional group is attached to one of the Carbons. In this case, C2H4 ethene is turned into ethanol.
When an alcohol undergoes oxidation, primary alcohols turn into aldehyde (-CHO) or carboxylic acids (-COOH). Secondary alcohol turns into ketone. Ethanol is a primary alcohol. And since it later reacts with propanol, it can only form carboxylic acid when it oxidizes. The product in this reaction is ethanoic acid.
Carboxylic acid reacts with alcohol to form an ester (-COO-). the -COOH group from acid combines with the -OH group from alcohol to form an ester bond -COO- while eliminating H2O. Therefore, when propanol undergoes esterification with ethanoic acid, propyl ethanoate is produced. It is the answer of B.
is a process that involves the collection of information and ideas supported by evidence.
Science
Systematics
Pseudoscience
Hypothesis
Answer:
pseudoscience
Explanation:
srry that this is so late btw, hope this helps...
Answer:
Science
Explanation:
First response is NOT correct
When a sample of Mg is combusted in a bomb calorimeter, 25.4 kJ of energy as heat is evolved. The calorimeter contains 7.50 x 102 g of water at an initial temperature of 18.6 °C. The specific heat capacity of water is 4.184 J/gLaTeX: \cdot⋅°C and the heat capacity of the bomb is 8.20 x 102 J/°C. Calculate the final temperature of the water and the bomb
Answer:
x = 25.02 or 25°c
Explanation:
Given:
mass of water : 7.50×10² =750 gm
Ccal = 8.20× 10² = 820 J/°c
Let assume final temp = x°c
then, heat gained by the water + heat gained by calorimeter
= 25400 J
⇒ Mw × Cw× ΔTw+ Ccal ×ΔT = 25400
⇒ 750× 4.184 × (x - 18.6) + 820 ×(x-18.6) = 25400
⇒ x = 25.02 or 25°c
How to calculate this ?
Do you use the molar mass and multiply it by the mass given ?
Answer:
Option C. 8.91g
Explanation:
The balanced equation for the reaction is given below:
2Pb(NO3)2 —> 2PbO + 4NO2 + O2
Next, we shall determine the mass of Pb(NO3)2 that decomposed and the mass PbO produced from the balanced equation.
This is illustrated below below:
Molar mass of Pb(NO3)2 = 207 + 2[14 + (16x3)]
= 207 + 2[14 + 48]
= 207 + 2[62] = 207 + 124
= 331g/mol
Mass of Pb(NO3)2 from the balanced equation = 2 x 331 = 662g
Molar mass of PbO = 207 + 16 = 223g/mol
Mass of PbO from the balanced equation = 2 x 223 = 446g
Summary:
From the balanced equation above,
662g of Pb(NO3)2 decomposed to produce 446g of PbO.
Finally, we can obtain the maximum mass of lead(II) oxide, PbO produced from 13.23g of lead (II) nitrate, Pb(NO3)2 as follow:
From the balanced equation above,
662g of Pb(NO3)2 decomposed to produce 446g of PbO.
Therefore, 13.23g of Pb(NO3)2 will decompose to produce = (13.23 x 446)/662 = 8.91g of PbO.
Therefore, 8.91g of PbO were obtained from the decomposition of 13.23g of Pb(NO3)2