Answer:
17
Explanation:
in a neutral atom the number of proton is equal to the number of neutron which is also equal to the number electron in a neutral element so according to the question the mass number is 34 it's proton and atomic number is still 17 and the electron is still 17
How much heat do you need to raise the temperature of 300 g of ethanol from 0°C to 20°C?
Answer:
14.6
Explanation:
I just took the test
The amount of heat to raise the temperature is 14.7J.
How do you calculate the heat needed to raise the temperature?The specific heat capacity of a substance is the quantity of heat needed to raise the temperature of a unit quantity of the substance by one degree. Calling the amount of heat added Q, which will cause a change in temperature ∆T to a weight of substance W, at a specific heat of material Cp, then Q = w x Cp x ∆T
By applying the formula, we get
Q = w x Cp x ∆T
Q = 300 * 2.46 * 20/1000
Q = 14.760J
What is heat?
Heat is energy that is transferred from one body to another as the result of a difference in temperature.
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4. Calculate the total heat required to convert 23.6 g of ice at -27 ºC to steam at 121 ºC. Hint: Calculation involves more than 1 step.
5.How much heat, in kJ, is needed to convert 12.8 g of ice at -18 ºC to steam at 118 ºC? Hint: Calculation involves more than 1 step.
Answer:
filedownload.ashx heres a pdf
Explanation:
Help help help I will give brainliest
Answer:
its b alkyne
Explanation:
brinliest po plsss
Answer:
Alkyne so its b
Hydrogen and oxygen combining to form water is an example of a physical change.
How does increasing temperature affects reaction rate?
Question 2(Multiple Choice Worth 2 points)
(04.06 LC)
The properties of elements can be predicted by which of the following?
Where it is on the periodic table
Where it was discovered
Its color in its natural state
Its name
Answer:
location on the periodic table
Explanation:
what type of reaction takes place when bromine reacts with iron iodide
Answer:
If you pass bromine vapour over hot iron, a similar but slightly less vigorous reaction happens, this time producing iron(III) bromide. Anhydrous iron(III) bromide is usually produced as a reddish-brown solid. Again the iron has been oxidised to an oxidation state of +3.
Explanation:
Which of the following statements are true about elements and compounds?
A. Elements are made up of compounds.
B. Compounds are made up of elements
C. Elements can be shown with chemical symbols, but compounds cannot.
D. Elements and compounds are the same thing.
Answer:
the answer is b
hope this helps :)
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What happens to the amount of electrical energy when there are no clouds?
Answer:
It slows down
Explanation:
What is the pressure?
What is the balanced equation for the reaction of a solution of sodium sulfate is mixed with strontium chloride?
Answer:
NaSO⁴(ads) ,ganadicate
⚠️⚠️What is kinetic energy ? ⚠️⚠️
Energy of work
Energy of movement
Energy of gravity
Energy of power
⚠️⚠️PLEASE HELP IM BEING TIMED⚠️⚠️⚠️
Answer:
Energy of Movement.
Explanation:
Have a great day!
what happens during a physical change?
A. New substances are formed
B. The identity of the substance is changed
C. A chemical reaction occurs
D. A substance may look different, but has not changed its identity.
Answer:
D
Explanation:
Hope this helped!
Which statement is true about the rotational period of the moon?
greater than the revolution period around Earth
always changing
less than the revolution period around Earth
equal to the revolution period around Earth
The statement is true about the rotational period of the moon " the rotational period of the moon is equal to the revolution period around Earth."
What is rotational period?A celestial object's rotation period may relate towards its sidereal rotation period, which is the time it takes for the object to complete one revolution around in its axis of rotation in sidereal seems like to the background stars.
What is revolution period?The orbital period is also known as the revolution period. it takes for one astronomical object to complete one cycle around another. It refers to planets and asteroids orbiting the Sun, moons orbiting planets, planetary systems orbiting other stars, or double stars in astronomy.
What is moon?In the night sky, the moon is just the brightest object. The moon doesn't at all produce its own light. It has no radiance. That is visible because the sun's light bounces off of it.
The rotational period of the moon is equal to the revolution period around Earth because the moon's rate of spin becomes tidally locked to its rate of revolution, it maintains the same face oriented towards the Earth In other words, every time the moon rounds the Earth, it rotates exactly once.
Therefore, the rotational period of the moon is equal to the revolution period around Earth will be correct answer.
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How many moles are in 7.12 x 1021 atoms of iron?
Answer:
0.0118mol
Explanation:
To obtain the number of moles (n) in the given number of molecules of iron, we divide by Avagadro's number (6.02 × 10²³).
That is; n = number of molecules ÷ nA
According to this question, there are 7.12 x 1021 atoms of Iron (Fe).
n = 7.12 x 10²¹ ÷ 6.02 × 10²³
n = 7.12/6.02 × 10^ (21 - 23)
n = 1.183 × 10^-2
n = 0.0118mol
The pH of an unknown strong acid is 2. What is the hydronium ion concentration?
Answer:
i believe its 12
Explanation:
The hydronium ion concentration can be found from the pH by the reverse of the mathematical operation employed to find the pH.
how many moles of HCI will react with 18.13g of SrO
Answer:
Explanation:
The balanced chemical equation between
SrO + 2HCl → H2O + SrCl2
What is the function of these organelles?
Answer:
Endoplasmic reticulum, Golgi apparatus, Nucleus, Storage Organelles, and Energy - Producing Organelles.
Explanation:
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What two forces act in the nucleus to create a 'nuclear tug-of-war'?
a.
Covalent bond, ionic bond
c.
Van der waals force, dipole
b.
Electrostatic repulsion, strong nuclear force
d.
All of the above
Answer:
Electrostatic repulsion, strong nuclear force
Explanation:
The nucleus consists of protons and neutrons. protons are positively charged while neutrons possess no charge.
Since protons are positively charged, they repel each other strongly (like charges repel). This strong repulsion of like charges makes the nucleus somewhat unstable leading to spontaneous fission of heavy nuclei.
However, an opposing force called nuclear attractive force tends to hold the nucleons together. This attraction occurs when two nucleons are bonded by a particle called a π meson.
Hence, the two forces that act in the nucleus to create a 'nuclear tug-of-war' are electrostatic repulsion and a strong nuclear force.
How many moles of hypomanganous acid. H3 MnO4, are contained in 22.912 g?
Answer:
0.188mol
Explanation:
Using the formula;
mole = mass/molar mass
Molar mass of hypomanganous acid. (H3MnO4) = 1(3) + 55 + 16(4)
= 3 + 55 + 64
= 122g/mol
According to this question, there are 22.912g of H3MnO4
mole = 22.912g ÷ 122g/mol
mole = 0.188mol
How many molecules are in 0.500 mole of N2O5?
Answer:
3,011.10e23.
Explanation:
Mole measure the number of elementary entities of a given substance that are present in a given sample. 3.01×10²³molecules are in 0.500 mole of N₂O₅.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number. Mole is directly proportional to given mass.
Mathematically,
Number of molecules/atoms/ions of N₂O₅ = number of moles×6.022×10²³(Avogadro number)
Number of moles of N₂O₅= 0.500 mole
Substituting the given values, we get
Number of molecules/atoms/ions =0.500moles×6.022×10²³(Avogadro number)
Number of molecules/atoms/ions of N₂O₅ =3.01×10²³molecules.
Therefore, 3.01×10²³molecules are in 0.500 mole of N₂O₅.
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what are radioactive tracers used for
Answer:
Radioactive tracers are widely used to diagnose industrial reactors, for instance by measuring the flow rate of liquids, gases and solids.
Explanation:
Radioactive tracers are widely used to diagnose industrial reactors, for instance by measuring the flow rate of liquids, gases and solids. A radioactive tracer is a chemical compound in which one or more atoms have been replaced by a radioisotope.
heres the link for more information
https://www.iaea.org/topics/radiotracers#:~:text=Radioactive%20tracers%20are%20widely%20used,been%20replaced%20by%20a%20radioisotope
.
2. Calculate the boiling point of a 1.7 m ethylene glycol solution.
How many joules of heat is needed to heat 68.00 grams of aluminum foil from
55.00 °C to 93.00 °C if aluminum has a specific heat of 0.90 J/g °C?
Answer:
2,325.6
Explanation:
You use the formula
Q =mco
M =mass =68
C=0.9
O=temperature increases =93-55=38
Then multiple all this 3
Q=68*0.9*38
The number of joules of heat that is needed to heat 68.00 grams of aluminum foil is 2,325.6.
What is specific heat?The amount of energy needed to raise the temperature of one gram of a substance by one degree Celsius.
By the formula of heat
Q = mct
The mass of aluminum is 68.00
the difference in temperature is 93.00 °C - 55.00 °C = 38.00
The specific heat is 0.90 J/g
Putting the values in the equation
[tex]Q = mct\\\\Q = 68.00 \times 0.90 \times 38.00 = 2325.6[/tex]
Thus, the joules of heat is 2325.6 J.
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Explain the process of fermentation.
Answer:
Fermentation, chemical process by which molecules such as glucose are broken down anaerobically. More broadly, fermentation is the foaming that occurs during the manufacture of wine and beer, a process at least 10,000 years old. The frothing results from the evolution of carbon dioxide gas, though this was not recognized until the 17th century.
Explanation:
looked it up-
Answer:
like babies or milk and cheese?
Explanation:
Which processes involve nuclear changes?
A. fission and fusion
B. erosion and weathering
C. combustion and oxidation
D. evaporation and condensation
Answer:
Nuclear processes, including fusion, fission, and radioactive decays of unstable nuclei, involve changes in nuclear binding energies.
Explanation:
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Which tool was most likely used in a procedure if the lab report shows that 300 mL of water was used?
O a volumetric flask
O a thermometer
a pipette
O a graduated cylinder
The knowledge produced by science builds on old ideas and is constantly changing.
State whether you agree or disagree with this statement considering what you have learned about the scientific process.
Agente infeccioso procariota cuyo ADN está disperso en el citoplasma"
1 punto
virus
bacteria
hongo
protozoo
helminto
una célula procariota o procarionte es un organismo unicelular sin núcleo cuyo material genético se encuentra disperso en el citoplasma reunido en una zona denominada nucleoide. por el contrario las células que sí tienen un núcleo diferenciado del citoplasma se llaman eucariotas es decir aquellas en las que su ADN se encuentra dentro de un compartimento separado del resto de la célula.
PLEASE HELP!!
ALL FAKE ANSWERS WILL BE REPORTED. SO WILL ANSWERS THAT HAVE NOTHING TO DO WITH WHAT I'M ASKING.
Answer:
1.)C₃H₈O
2)OH
3.)1-propanol
1.) C4H8O
2.) C2H6O or CH3CH2OH
3.)Ethanol