Answer:
An endothermic reaction is when heat is needed by the reaction, so it draws heat from its surroundings, making them feel cold. Just like a ice pack.
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:
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.
What is the balanced form of the chemical equation shown below?
C2H5OH() + O2(9)
H2O() + CO2(9)
A. C2H5OH() + 302(9) — 3H20() + 2002(9)
B. 2C2H5OH() + O2(g) – 5H20(1) + CO2(g)
C. C2H20(1) + 202(9)
-
H20(1) + 2C02(9)
D. C2H5OH() + O2(g) → H20(1) + CO2(g)
Answer:
C2H5OH +3O2 = 2Co2+ 3H2O
Explanation:
The balanced chemical equation is C2H5OH + 302 → 3H20 + 2CO2.
What is balanced chemical equation?A balanced chemical equation is one in which the count of atoms in all of the molecules is equivalent on both sides of the equation. The balancing of a particular chemical equation is governed by the Law of Conservation of Mass.
Balancing chemical equation is shown as below:
It can be seen that the count of carbon atom in left side 2 on the other hand the count of carbon in right side only one. By multiply with 2 in right side of the reaction , equation will be balanced.
Therefore, the balanced chemical equation is C2H5OH + 302 → 3H20 + 2CO2.
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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
Temperature is measured in what unit?
J
J/goC
J/g
oC
Temperature is measured in Kelvin..
Molar mass of C^6H^12O^6
Answer:
The molar mass of C6 H12 O6 is 180.15588 g/mol.
Explanation:
At the beginning of the reaction: N2 + 3H2 -> 2NH there is 1 mol of N. and 3 moles of H, and at the end of it is present a mixture formed by 2.5 moles in total, what is the performance for the reaction?
5.- Al comenzar la reacción: N2+ 3H2 -> 2NH existe 1 mol de N. y 3 moles de H, y al finalizarla está presente una mezcla formada por 2,5 moles en total, ¿cuál es el rendimiento para la reacción?
Answer:
75%
Explanation:
call realistic moles of N2 in the reaction is a
moles of H2 :3a
moles of NH3: 2a
the moles of residual N2 after reaction: 1-a
the moles of residual H2 after react: 3- 3a
the moles of mixture: 2a+1-a+3-3a=2.5
-> a=0.75
H=0.75/1=75%
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?
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 is the name of this organic molecule
Answer:
C2H4 Ethylene
Explanation:
Hope it helps! :)
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 :)
Write the relation of M3 with its multiples
Explanation:
HI friends good morning
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:
:)
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.
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
6.25 g of HCl(g), a strong acid, is dissolved in water to make a 280-ml solution.
Calculate the pH of the resulting solution.
pH= -log[0,611]= 0,21
what are the main tybes of mixture
Answer:
salt and oil
water and salt
water and sugar
Explanation:
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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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
PLZ HELP ME WITH MY WORK
Answer:
neutrons should be added with the protons
PLEASE HELP ASAP
Barney was a very inventive scientist and tried to perform the same experiments as those by famous scientists from long ago. One of the most challenging experiments was to roll out a very thin film of gold and put X-ray film in a circle around it. The difficult part was to get ahold of some radioactivity that he could shoot at the thin film for gold. One day, he ran into The Great Gazoo and told him his goal. The Great Gazoo said he had the perfect substance for him that was radioactive and should work. The element was named after him and had the symbol Gz. Barney quickly went back to his lab to run the experiment. What Barney noticed is that all the radioactive particles went through the gold film and none of them ricocheted back, but all went straight through the gold. Being puzzled, he quickly went to the lab to analyze this unknown radioactive substance. He found that the atomic number was 119, the mass number was 305. After a few more tests, Barney realized what was wrong with Gz. Your task is to figure out what was wrong with Gz by answering the following questions:
Whose experiment was Barney trying to imitate?
Where would Gz be located on Earth’s periodic table, column and row?
Give as many details on Gz that you could predict based on its location on the periodic table: type of chemical (metal, metalloid, or nonmetal), reactivity, ionization energy, electronegativity, and size of element.
What would the elements electron configuration end in?
Why did all the radioactive particles go straight through the gold film?
What would the daughter product be for Gz? Give all details for the atomic number, mass number, number of protons, neutrons and electrons.
If Gz had worked correctly, like Barney intended, what type of decay should Gz have had?
If Gz had worked correctly, what would the daughter product be? Give all details for the atomic number, mass number, number of protons, neutrons and electrons.
If Gz had worked correctly, what element would it become?
Answer:
a) Barney wants to repeat the rutheford experiment
b) the element will be in row 8 column 1 being an alkali metal
c) it should be a radioactive element, with a lot of mass
Explanation:
n this exercise they indicate that the particle Gz has atomic number 119 and atomic mass 305 amu, when reviewing the element periodicity table with this atomic number it has not yet been discovered, it should be in row 8 column 1 therefore it should be an alkali metal .
Therefore, it has only one electron in its last orbit.
a) Barney wants to repeat the rutheford experiment
b) the element will be in row 8 column 1 being an alkali metal
c) it should be a radioactive element, with a lot of mass
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:
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
please help !!!! may give brainliest
Answer:
Would be increasing the concentration of SO3 as you chose in the question.
Explanation:
Increasing the concentration of the reactant will most likely shift it to the right by adding more products.
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!
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
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]
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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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.
write the electronic configuration of the first 20 element
