Answer:
78° C.
Explanation:
The final temperature of water is 81℃ , if it is allowed to cool from a temperature of 95 and it releases heat of 1200J.
What is the final temperature of water?In the following question we will apply specific heat Capacity equation
q=mct Δt
q= 1200J m= 20 g c= 4.186 T₁= 95 ℃
1200= 20 ✕4.186(95-T₂)
T₂=81℃
Hence, The water cools to 81℃ temperature
Learn about specific heat capacity
https://brainly.com/question/1747943
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6. Changes in the rate of chemical reactions depend on what conditions?
Answer:
temperature, concentration, pressure
How did Rutherford's work help form the present-day model of the atom?
Answer:
Rutherford overturned Thomson's model in 1911 with his well-known gold foil experiment in which he demonstrated that the atom has a tiny and heavy nucleus.
Explanation:
Rutherford designed an experiment to use the alpha particles emitted by a radioactive element as probes to the unseen world of atomic structure.
What are the steps of preparing a 2M solution of NaOH
(Its talking about molarity)
here's your answer..
what does LUCA stand for
What is the molarity of 2.5 mol NaOH in a 1.0 L solution?
Answer:
0.0015 M
Explanation:
we know, M = n/V = 2.5/1000 = 0.0015 M
If you react 156.0 g of calcium chloride with an excess NaOH, how much sodium chloride should you get?
Answer:
164.3g of NaCl
Explanation:
Based on the chemical equation:
CaCl2 + 2NaOH → 2NaCl + Ca(OH)2
where 1 mole of CaCl2 reacts with 2 moles of NaOH
To solve this question we must convert the mass of CaCl2 to moles. Using the chemical equation we can find the moles of NaCl and its mass:
Moles CaCl2 -Molar mass: 110.98g/mol-
156.0g CaCl₂ * (1mol / 110.98g) = 1.4057 moles CaCl2
Moles NaCl:
1.4057 moles CaCl2 * (2mol NaCl / 1mol CaCl2) = 2.811 moles NaCl
Mass NaCl -Molar mass: 58.44g/mol-
2.811 moles NaCl * (58.44g / mol) = 164.3g of NaCl
is the following chemical equation balanced? Please make a claim, provide evidence, and then explain
your reasoning
2Li + 2H2O → H2 + 2LIOH
What is the hottest place on the planet?
Answer:
Death Valley in California U.S. is the hottest place in the world
A gas has a pressure of 6.5 atm at 540 K. What will the pressure be at 210 K if the volume does not change
Answer:
The pressure at 210 K will be 2.53 atm.
Explanation:
Gay-Lussac's law indicates that, as long as the volume of the container containing the gas is constant, as the temperature increases, the gas molecules move faster. Then the number of collisions with the walls increases, that is, the pressure increases. That is, the pressure of the gas is directly proportional to its temperature.
This law mathematically indicates that the quotient between pressure and temperature is constant:
[tex]\frac{P}{T} =k[/tex]
You want to study two different states, an initial state and a final state. You have a gas that is at a pressure P1 and at a temperature T1 at the beginning of the experiment. By varying the temperature to a new value T2, then the pressure will change to P2, and the following will be fulfilled:
[tex]\frac{P1}{T1} =\frac{P2}{T2}[/tex]
In this case:
P1= 6.5 atmT1= 540 KP2= ?T2= 210 KReplacing:
[tex]\frac{6.5 atm}{540 K} =\frac{P2}{210 K}[/tex]
Solving:
[tex]P2=210 K*\frac{6.5 atm}{540 K}[/tex]
P2=2.53 atm
The pressure at 210 K will be 2.53 atm.
¿por qué la teoría de Demócrito fue reemplazada por la teoría de Dalton y luego esta teoría fue reemplazada por por Rutherford.?
Answer:
Debido al descubrimiento de protones, neutrones y electrones.
Explicación:
La teoría de Demócrito fue reemplazada por la teoría de Dalton y luego la teoría de Dalton fue reemplazada por la de Rutherford debido al descubrimiento de protones, neutrones y electrones que están presentes dentro del átomo. Demócrito afirma que el átomo es una partícula indivisible de materia, pero el descubrimiento del protón, el neutrón y el electrón cambió este concepto de átomo, por lo que debido al mayor descubrimiento y estudio del átomo y sus partículas subatómicas, las teorías cambiaron con el paso del tiempo.
Calculate the amount of moles in 6.75 liters of nitrogen gas.
151 mol
.301 mol
8.44 mol
0.0215 mol
Answer:
There are 0.301 moles of N2 gas in 6.75 liters of N2 gas.
Explanation:
Given,
Volume of N2 gas = 6.75 L
We know,
At STP,
Number of moles = [tex]\frac{Volume}{22.4 L}[/tex] [Here 22.4 liter is the molar volume of any gas at STP]
= [tex]\frac{6.75L}{22.4L}[/tex]
= [tex]0.301[/tex]
∴There are 0.301 moles of N2 gas in 6.75 liters of N2 gas.
Global climate change is a result of human activity?
Answer:
Yes
Explanation:
Due to pollution, greenhouse gasses, etc
Humans are increasingly influencing the climate and the earth's temperature by burning fossil fuels, cutting down forests and farming livestock. This adds enormous amounts of greenhouse gases to those naturally occurring in the atmosphere, increasing the greenhouse effect and global warming.
Determine the percent yield if 0.0419 mol of ethyl acetate is produced but 0.0722 mol is calculated as the theoretical yield?
which one of these three elements conatain the most protons
A.copper
B. radon
C. sodium
Answer:
i think it's B sorry if i'm wrong
Adding energy to an endothermic reaction will push the reaction towards...
A. Will have no effect
B. Products
C. Reactants
thank you :)
Answer:
Products
Explanation:
In an endothermic reaction, energy is taken in. This means that the absorption of energy favours the forward reaction.
Hence for a process; A + B----> C, if energy must be added for the equilibrium to shift towards the right and more of C is produced, then the reaction is endothermic.
Does heat flow out of the atmosphere (HQ)
change during the day?
Answer:
The heat flow into Earth's atmosphere varies as the Sun rises and sets, gradually increasing during the day and falling to zero at night.
Explanation:
Heat radiates from the ground into the lower atmosphere. In conduction, heat moves from areas of more heat to areas of less heat by direct contact. Warmer molecules vibrate rapidly and collide with other nearby molecules, transferring their energy.
convert 0.75km to meter
Answer:
[tex]0.75 \times 1000 = [/tex]
Explanation:
Use ur calculator
Answer:
750m
Explanation:
1 km is equal to 1000m. Therefore all you have to do is multiply 0.75 by 1000 and you will get 750. Hope this helps! :)
why metal in the middle of metal activity series can't be obtained by heating ors in air please help me I will give u branist.follow u back and give u like plz help me with a good answer
[tex]\huge\mathsf{\red{\underline{\underline{Answer}}}}[/tex]
[tex]{\green{\dashrightarrow}}[/tex]Metals such as iron, zinc, lead, copper, etc., are in the middle of the reactivity series. These are moderately reactive metals and are usually present as sulphides or carbonates. A metal is obtained from its ore by the processes of reduction or by electrolysis.
11. Which do you think is more important in forming personality---environment or heredity? Explain your answer.
Answer:
I believe forming an environmental personality is more important than forming a hereditary personality. Why I said this is because of the people around out can change your personality, and sometimes if you're with the wrong people, it can go wrong, with your personality too. You could have been a nice person at some time, you bur you hung out with the wrong people and now you're just very inconsiderate. Another reason on why I believe forming an environmental personality is more important because of the fact that maybe you could've been born with a parent who has a bad personality. You could try your best to be nicer by the choice of people you choose to be friends with.
Explanation:
i hope this helped, im only in 7th
how to write electronic configuration.
Start from scratch
Coz I am fresher
Answer:
the electrons in the innermost shell of an atom are called core electrons while the electrons in the outermost shell are called Valence electrons the arrangement of electrons in the shells of an atom is known as electron configuration.
If the last carbon atom of an unsaturated fatty acid is bonded to two hydrogen atoms and one carbon atom, what type of bond must exist between the last carbon and the other carbon atom
Answer:
Double bond
Explanation:
Carbon is a tetravalent atom. This implies that the carbon atom always forms four covalent bonds.
These four covalent bonds may be single, double or triple bonds. Compounds that contain double and triple bonds are said to be "unsaturated".
If the last carbon atom of an unsaturated fatty acid is bonded to two hydrogen atoms and one carbon atom, it means that the bond between the last carbon and the other carbon atom must be a double bond because carbon must be tetravalent and we have already been told that the fatty acid is unsaturated.
The last carbon atom of the unsaturated fatty acid must form two covalent bonds to the other carbon atom in order to respect the tetravalency of carbon.
Answer:
Double bond
Explanation:
its in the book
Can someone please explain this to me t,t
I could do the second part if i just understood the first-
Answer:
Theoretical 32.04 g
The precent yeild 87. 39 %
Explanation:
Mole of H2 = m/mw = 4/2 = 2 mol
From the equation
1 mol H2 --> 1/2 mol CH3OH
2 mol H2 -->??
So we have 1 mol Ch3oh
Mass of Ch3oh = mole *Mw = 1* 32.04
= 32.04g >>> the theoretically
For percent yeild = actual / theoretical * 100%
( 28.0/32.04) *100% =
87.93%
Balance the equation !!!
Answer:
https://www.webqc.org/balance.php
Explanation:
this is the website i used to balance all my chem equations
i promise its not a scam its a legit website lol it works rly well
Which of the following pH numbers are basic? (Choose 2)
11
5
7
9
Answer:
7 is the only basic number on a pH scale
how many moles are in 29.8grams of CaCl2?
Answer:
110.984 ?
i apologize if i'm wrong, you can report it if im wrong
have a good day/ night
Explanation:
does it have any difference between atomic mass and mass number
Answer:
Atomic mass is the weighted average mass of an atom of an element based on the relative natural abundance of that element's isotopes. The mass number is a count of the total number of protons and neutrons in an atom's nucleus.
Answer:
Atomic mass is the weighted average mass of atom of an element based on the relative abundance of the element's isotopes. The mass number is a count of total number of protons and neutrons in an atom's nucles
Can someone please help me pls
Answer:
I guess option d
hope I am correct
How do fossils evidence help you put the landmasses together
Explanation:
Alfred wegener collected pieces of evidence to support his theory having to do with geological "fit" and fossil evidence. This means that these extensive oceans between these land masses act as a type of barrier for fossil transfer.
One of the reasons that solid CuSO4 dissolves in water is: a instantaneous dipole-induced dipole forces (dispersion or London forces) between the Cu2 and the SO42- ions b the ion-dipole forces between the ions and the water molecules c the electrostatic force of attraction between the Cu2 and the SO42- ions d the hydrogen bonding between the water molecules e instantaneous dipole-induced dipole forces (dispersion or London forces) between the water molecules
Answer:
the ion-dipole forces between the ions and the water molecules
Explanation:
Water is a polar molecule having a high dipole moment. This high polarity makes it a popular choice of polar solvent.
CuSO4 is an ionic compound composed of Cu^2+ and SO4^2-. When dissolved in water, the positive dipole in water interacts with the negative ion while the negative dipole in water interacts with the positive ion thereby causing the compound(CuSO4 ) to dissolve in water due to the ion-dipole forces between the ions and the water molecules.
EASY 100 POINTS, WILL MARK BRAINLEST, 2 QUESTIONS, SHOW YOUR WORK OR NO POINTS
Answer:
Explanation:
1. Please provide the enthalpy info - I will work on it with the info
2.
i) Reaction a should be modified to match the number of S in equation:
2S + 2O2 -> 2SO2 deltaH = -370kJ
ii) Reaction b should be written reversely to match the reactants of SO2:
2SO2 + O2 -> 2SO3 deltaH = 256kJ
iii) Adding the equations together:
2S + 3O2 -> 2SO3
iv) Enthalpy of the combined reaction = -370+256 = -114kJ
It is negative so the reaction is exothermic.
Answer:
Explanation:
1 c. enthalpy change = enthalphies of formation of all products - enthalphies of formation of all reactants = -526.3 kcal/mol
1 d. C3H8(g) + 5 O2 (g) → 3 CO2 (g) + 4 H2O (l) ΔH = -526.3 kcal/mol