Answer:
Its B all the others arent true and also dont make any sense
Explanation:
Sodium has a lower ionization energy than magnesium describes why sodium reacts vigorously than magnesium chloride.
Why is sodium more reactive than magnesium?Sodium is more reactive than magnesium because it has the ability to easily lose electron, hence have lower ionization energy.Sodium belong to group one on the periodic table and they are called akali metal while magnesium belong to group two on the periodic table and they are called alkali Earth metal.Sodium and magnesium belong to the in the 3rd period. Iin the outermost energy level sodium has one electron but magnesium has 2 electrons. Therefore, there is more attraction abetween the nucleus and electrons in magnesium than that of sodium.Therefore, sodium is more reactive than magnesium chloride because of lower ionization energy.
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Prepare a project report on various samples of a) a mixture b) a compound c) an element (metal or nonmetal)
Answer:
Any substance that contains only one kind of an atom is known as an element. Because atoms cannot be created or destroyed in a chemical reaction, elements such as phosphorus (P4) or sulfur (S8) cannot be broken down into simpler substances by these reactions.
Example: Water decomposes into a mixture of hydrogen and oxygen when an electric current is passed through the liquid. Hydrogen and oxygen, on the other hand, cannot be decomposed into simpler substances. They are therefore the elementary, or simplest, chemical substances - elements.
Each element is represented by a unique symbol. The notation for each element can be found on the periodic table of elements.
The elements can be divided into three categories that have characteristic properties: metals, nonmetals, and semimetals. Most elements are metals, which are found on the left and toward the bottom of the periodic table. A handful of nonmetals are clustered in the upper right corner of the periodic table. The semimetals can be found along the dividing line between the metals and the nonmetals.
Explanation:
When 4.2 gram of sodium bicarbonate reacts with 10.0 g of acetic acid, the product contains 2.2 g of carbon dioxide and residue cxontaining water and Sodium acetate. The mass of the residue will be:- *
Na2CO3+2HCl⟶2NaCl+H2O+CO2
Law of conservation of mass- It states that for any closed system, the mass of the system always remain constant over time, as mass of system cannot change. Therefore, (mass of Na2CO3+ mass of HCl) should be equal to (mass of residue + mass of CO2)
Mass of Na2CO3=4.2 g
Mass of HCl=10 g
Mass of residue =12 g
Mass of CO2=2.2 g
∴ Mass of Na2CO3+ Mass of HCl=14.2 g
and Mass of residue + Mass of CO2=14.2 g
Therefore, they follow law of conservation of mass.
A certain volume of gas S takes 180 secs to diffuse through a porous plug. An equal amount of gas Q takes 240 secs to diffuse the same plug. Calculate the molar mass of gas Q if the molar mass of gas S is 18.
Answer:
31.98g/mol
Explanation:
Using Graham's law of diffusion, which states that the rate of diffusion of a gas is inversely proportional to the square root of its molecular mass (M). Rate of diffusion = volume/time.
Since both gas S and Q have equal volumes, we can calculate molecular mass of gas Q as follows:
tQ/tS = √mQ /√mS
Where:
tQ = time of diffusion of gas Q
tS = time of diffusion for gas S
mQ = molar mass of gas Q
mS = molar mass of gas S
According to the information provided in this question;
tQ = 240s
tS = 180s
mQ = ?
mS = 18g/mol
Using tQ/tS = √mQ /√mS
240/180 = √mQ / √18
1.333 = √mQ / √18
Square both sides
1.333² = mQ/18
1.78 = mQ/18
mQ = 18 × 1.78
mQ = 31.98g/mol
Molar mass of Q = 31.98g/mol
A piece of unknown metal with mass 68.6 g is heated to an initial temperature of 100 °C and dropped into 8.4 g of water (with an initial temperature of 20 °C) in a calorimeter. The final temperature of the system is 52.1°C. The specific heat of water is 4.184 J/g*⁰C. What is the specific heat of the metal?
0.171
0.343
1.717
3.433
Answer:
1.717
Explanation:
what is chemical formula of water ? how it is composed
Answer:
H2O
Explanation:
it is composed of 2 atoms of Hidro and 1 atom Oxy
Answer:
The chemical formula for water is H2O..it is composed by the bonding of 2 molecules of hydrogen and one molecule of oxygen,a covalent bond to be specific.
I hope this helps
what are the main tybes of mixture
Answer:
salt and oil
water and salt
water and sugar
Explanation:
what is the name of this organic molecule
Answer:
C2H4 Ethylene
Explanation:
Hope it helps! :)
what apparatus is used to investigate the conductivity of solutions
Which statement describes the law of conservation of energy?
All systems will exchange matter and energy with their surroundings.
All systems can exchange energy, but not matter, with their surroundings.
Energy cannot be created nor destroyed, but it changes from one form to another.
Energy is destroyed in most chemical reactions when new products are formed.
Answer:
All systems will exchange matter and energy with their surroundings.
Explanation:
Answer:c
Explanation:
Are you ready kids?
Aye, aye Captain.
I can't hear you!
AYE, AYE CAPTAIN!
Oooooooooh.
Who lives in a pineapple under the sea?
Spongebob squarepants!
Absorbent and yellow and porous is he?
Spongebob squarepants!
If nautical nonsense be something you wish!
Spongebob squarepants!
Then drop on the deck and flop like a fish!
Spongebob squarepants!
Ready?
Spongebob squarepants.
Spongebob squarepants.
Spongebob squarepants.
Spongebob squarepants.
Spongebob-squarepants.
A drink that contains 4 1/2 ounces of a proof liquor… approximately how many drinks does this beverage contain?
Complete Question
A guest orders a drink that contains 4 1/2 ounces of 80-proof liquor. Approximately how many drinks does this beverage contain?
Answer:
[tex]No\ of\ drinks =3[/tex]
Explanation:
From the question we are told that:
Ordered drink 4 1/2 ounces of 80-proof liquor
Generally
80-proof liquor contains 40\% alcohol
Giving the drink a standard 1.5 ounce of distilled spirit
Therefore
[tex]No\ of\ drinks =\frac{4.5}{1.5}[/tex]
[tex]No\ of\ drinks =3[/tex]
Unknown # 41
Flame Test Color: Lilac
Addition of HCl(aq): NR (No reaction)
Addition of HCl(aq) and BaCl2(aq): NR (No reaction)
Addition of HNO3(aq) and AgNO3(aq): Yellow precipitate
What is the unknown ionic compound molecular formula?
write the electronic configuration of the first 20 element
Molar mass of C^6H^12O^6
Answer:
The molar mass of C6 H12 O6 is 180.15588 g/mol.
Explanation:
Currently, nuclear energy provides only a small fraction (~10%) of energy used in the United States. In some other places, like France, it is close to 80%. Do you think nuclear energy will ever be a more widely used source of energy in the United States? Why or why not?
PLEASE HELP ASAP PLEASEEE
Nuclear energy is currently within almost every country becoming a growing source of energy use since it can provide a lot of energy within a short amount of time with little resources used to create it. It is quite possible that within the next few generations that nuclear energy could become a much larger source of energy within the United States. Although, many countries after the leak have resorted to other means of energy sources learning from the mistakes of Japan.
Hope this helps :)
If Bromine has a charge of 1-, how many electrons does it have?
Answer:
36 electrons
Explanation:
But Bromine anion with a charge of -1 has one extra electron so 35 +1 = 36 electrons.
Vitamin C is a water-soluble vitamin, so your body doesn't store it. You have to get the required amount from your diet (citrus fruits are a great source!), or you could take a daily vitamin C supplement pill. Vitamin C is ascorbic acid, so to determine how much vitamin C (acid) has been placed in each pill, you could do an acid-base titration. One vitamin C pill was dissolved in water and titrated to an endpoint by 16.00 mL of a 0.447 M solution of NaOH. How many grams of ascorbic acid were there in the pill? (MW of ascorbic acid is 176.1 /mol). Explain and show your work.
Answer:
1.26 g
Explanation:
Number of moles of ascorbic acid = concentration × volume
Concentration = 0.447 M
Volume = 16.00 mL
Number of moles = 0.447 × 16/1000
Number of moles = 7.152 × 10^-3 moles
Number of moles= mass/molar mass
Molar mass of ascorbic acid = 176.1 g/mol
Mass = 7.152 × 10^-3 moles × 176.1 g/mol
Mass = 1.26 g
Temperature is measured in what unit?
J
J/goC
J/g
oC
Temperature is measured in Kelvin..
What is reducing agent in the following reaction-
CuO + H2 ------>Cu + H2O?
A)CuO
B)Cu
C)H2O
D)H2
Answer:
H2
Explanation:
It helps to remove the oxygen
Answer:
It is H2. hope it helps if not sorry
What is the concentration of a solution formed by diluting 25.0 ml of a 3.8M glucose solution to 250ml
Explanation : số mol glucose 3.8M là :
n = Cm . V = 3.8 . 25 =95
=> Cm khi pha loãng = [tex]\frac{n}{V}[/tex] = [tex]\frac{95}{250}[/tex] = 0.38M
According to molar concentration, the concentration of a solution formed by diluting 25.0 ml of a 3.8 M glucose solution to 250 ml is 0.38 M.
What is molar concentration?Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.
In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.In case of 2 solutions given it is calculated as M₁V₁=M₂V₂,on substitution, M₂=3.8×25/250=0.38 M.
Thus, the concentration of a solution formed by diluting 25.0 ml of a 3.8 M glucose solution to 250 ml is 0.38 M.
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Balance the redox reaction by oxidation number or ion electron method and indicate oxidizing and reducing agent . KMno4 + KBr + H2SO4 approach K2SO4 + MnSO4 + H2O + Br2
Answer:
2KMnO₄ (aq) + 10KBr (aq) + 8H₂SO₄ (aq) -> 2MnSO₄ (aq) + 5Br₂ (aq) + 6K₂SO₄ (aq) + 8H₂O (l)
oxidizing agent = KMnO₄
reducing agent = KBr
Explanation:
KMnO₄ -> 2Mn⁷⁺ + 10e⁻ = 2Mn²⁺
KBr -> 10Br⁻⁺ - 10e⁻ = 10Br⁰
Mother is frying fish in the kitchen. The aroma of fried fish can be smelled by Sofea who is sitting in the living room. Explain how the aroma of the fried fish reach the living room.
Answer:
through process of diffusion
Explanation:
air particles and odours move freely in all directions and eventually spreads out thus reaching the sitting room
The process of diffusion causes the particles of the aroma of the fried fish to reach the living room.
What is diffusion?Diffusion can be described as the net movement of anything such as molcules, or energy from a region of higher concentration to a region of lower concentration. Diffusion is generally driven by a gradient in Gibbs free energy or chemical potential.
The concept of diffusion can be used in fields such as physics, chemistry, biology, sociology, economics, and finance. The central idea of diffusion is common that a substance undergoing diffusion spreads out from a point or location at which there is a higher concentration of that substance.
A gradient can be defined as the change in the value of an amount such as concentration, pressure, or temperature with a change in another variable, distance.
A change in concentration over a distance is known as a concentration gradient, and a change in pressure over a distance is known as a pressure gradient.
The Latin word diffusion means "to spread out." Therefore, the aroma of the fried fish diffuses and reaches to lining room.
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PLZ HELP ME WITH MY WORK
Answer:
neutrons should be added with the protons
Iron and chlorine form an ionic compound whose formula is FeCl3. The name of this compound is __________. Group of answer choices iron chlorine iron (III) chloride moniron trichloride iron (III) trichloride ferric trichloride
Answer:
Iron and chlorine form an ionic compound whose formula is FeCl3. The name of this compound is iron (III) chloride or iron trichloride.
Explanation:
Iron (III) chloride or Iron trichloride is also known as ferric chloride, it is a common compound of iron in the +3 oxidation state. The anhydrous compound is a crystalline solid with a melting point of 307.6 °C.
Consider these chemical equations.
N2(g) + 3H2(g) → 2NH3(g)
C(s) + 2H2(g) → CH4(g)
4H2(g) + 2C(s) + N2(g) → 2HCN(g) + 3H2(g)
Which equation(s) do you need to reverse in order to calculate the overall equation for the formation of HCN and H2 from NH3 and CH4? Check all that apply.
Answer:
A. N2(g) + 3H2(g) Right arrow. 2NH3(g)
B.C(s) + 2H2(g) Right arrow. CH4(g)
Explanation:
Answer:
a and b
Explanation:
second question
miultiplu second eq by 2
wer the following questio What is meant by a solutio What is a saturated solutio Define: give an example.
Answer:
A solution in which the maximum amount of solvent has been dissolved. Any more solute added will sit as crystals on the bottom of the container.
Explanation:
A solution in which the maximum amount of solvent has been dissolved. Any more solute added will sit as crystals on the bottom of the contain
er.
an atom contains positive protons and negative electrons. Why atom is electrically neutral.
Answer:
atom is electrically neutral because
the no.of protons is equal to no.of
electrons.
Therefore the negative charge and
positive charge cancels out.
What does the reducing agent do in a redox reaction? (A.P.E.X)
Answer:
The reducing agent donates electron to the oxidizing agent and gets oxidized itself
Explanation:
In an oxidation-reduction reaction, also known as REDOX reaction, one of the reactants is called OXIDIZING AGENT while the other is called REDUCING AGENT. The reducing agent is called so because it reduces another substance in the reaction.
It reduces another atom/ion by donating electrons to that atom, hence, getting oxidized itself in the process. For example, in the following reaction:
H2 + F2 → 2HF
Fluorine is getting oxidized from -2 to 0 by donating electrons to H and reducing it from +2 to 0.
Answer:
Reduces another atom
Explanation:
:)
Question 5
1.00 g of He, 14.0g F2, and 19.0 g Ar are placed in a 13.0-L container at 20.0 °C.
The total pressure (in atm) in the container is _____ atm.
1 point
Answer:
2.03 atm
Explanation:
Number of moles of He = 1g/4g/mol = 0.25 moles
Number of moles of F2 = 14.0g/38 g/mol = 0.37 moles
Number of moles of Ar=19.0g/40g/mol = 0.48 moles
Total number of moles = 0.25 + 0.37 + 0.48 = 1.1 moles
From;
PV=nRT
P= pressure of the gas mixture
V= volume of the gas mixture
n= total number of moles of the gas mixture
R= gas constant
T= temperature of the gas mixture
P= nRT/V
P= 1.1 × 0.082 × 293/13
P= 2.03 atm
calculate the volume of the object immersed in the water in the water in the adjoining figur.
Answer:
100 cm³
Explanation:
Hi there!
Subtract:
400 cm³ - 300 cm³
= 100 cm³
Therefore, the volume of the object is 100 cm³.
I hope this helps!
what is precipitating ???
anyone please tell me how to delete an I'd
Explanation:
Desposition of solid matter in a solution
