Care este concentratia procentuala a amestecului obtinut prin amestecarea a 25g acid sulfuric de concentratie 30% si 36 g solutie acid sulfuric de concentratie 65%?
What is the concentration of the combination of 25grams of sulphuric acid of concentration 30% and 36 grams of solution of sulphuric acid of concentration 65%
Answers
Explanation:
REFER TO THE ATTACHMENT ABOVE.....
Related Questions
which of the following has more particles
6.02x10(small numbers)23 molecules CO2
9 moles PF2
10 mole NaCI
18 g H2O
Answers
Answer:
A mole is Avogadro's number of items: 6.022 × 1023.
Explanation:
When 10 grams of water completely evaporate into water vapor, the volume of the water vapor is greater than the volume of the original liquid water, but the mass remains the same. Why does the mass stay the same? Which answer is correct?
A
The temperature of the liquid water and water vapor is the same.
The temperature of the liquid water and water vapor is the same.
B
The density of the liquid water is the same as the density of the water vapor.
The density of the liquid water is the same as the density of the water vapor.
C
The number of atoms in the water vapor is equal to the number of atoms in the liquid water.
The number of atoms in the water vapor is equal to the number of atoms in the liquid water.
D
The distance between the water molecules is the same in the liquid and the vapor.
The distance between the water molecules is the same in the liquid and the vapor.
Answers
Answer: I think the answer is B or C, its kind of hard.
As the number of atoms in the water vapor is equal to the number of atoms in the liquid water. Therefore, the mass of the water remains the same.
What is evaporation?Evaporation is a process that usually happens on the surface of water or liquid and it involves the conversion of the liquid phase into the gaseous phase. This process involves a change in the state of matter of water or liquids.
When the water is completely evaporated into water vapor the density of the water vapor is less than the density of the liquid water as the vapors occupy a large volume in comparison to liquid water.
But the number of atoms in the water vapor is the same as the number of atoms in the liquid water. The mass of the water is due to the mass of the atoms.
Therefore, the mass of the water remains the same during the phase transition from liquid water to water vapors. Therefore, option (C) is correct.
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Which surface will produce the most friction for the fan cart?
Glass
Wood
Metal
Cement
Answers
Answer:
wood
Explanation:
I think
I hope it helps
How many moles of I2 are in 8.23 moles of NaI ?
Answers
Answer: 4.12
Explanation:
we know that the given mol is 8.23 mol and they are 2NaI and I2 so we will write the equation like this.
8.23mol NaI x 1mol of I2 ÷ 2molNaI = 4.115≅ 4.12 mol of I2
we placed NaI at the bottom to cancel out with the 8.23 mol of NaI
why is respiration considered an exothermic process
Answers
Answer:
Respiration is considered as exothermic reaction because energy is released in this process. Glucose combines with oxygen present in our cells to form carbon dioxide and water along with energy.
Explanation:
Good Luck!
Respiration is considered as an exothermic reaction because, in the respiration process, oxidation of glucose takes place which produces a large amount of heat energy stored in the form of ATP. This is shown in the following chemical equation C 6
PLEASE HELP: 60 POINTS
Select all that apply!
The emission of a Beta particle has the effect of:
a change in mass of an electron emitted from the nucleus
decreasing mass by one unit
increasing mass by one unit
adding a proton to the nucleus
converting 1 neutron to 1 electron and 1 proton
Answers
PLZ HELP WILL BRAINLIEST
Balance the following equation: Fe2(SO4)3 + KOH --> K2SO4 + Fe(OH)3
Write the coefficients that you decide to balance the equation like this 3, 4, 3. If you do not add a coefficient in front of an element or compound, use a 1 in your answer. For instance the for this balanced equation: 2H2 + O2 --> 2H2O you would write your answer: 2, 1, 2
Answers
Answer:
6,3,2
Explanation:
Fe2(SO4)3 + 6 KOH = 3 K2SO4 + 2 Fe(OH)3
Which salt is the most common found in ocean water?
magnesium
calcium carbonate
potassium
sodium chloride
Answers
Answer:
Sodium chloride
Explanation:
There are several salts in seawater, but the most abundant is ordinary table salt or sodium chloride (NaCl). Sodium chloride, like other salts, dissolves in water into its ions, so this is really a question about which ions are present in the greatest concentration. Sodium chloride dissociates into Na+ and Cl- ions.
Describe a time in the group discussion when you referred to the notes you took, the graphic organizer you filled out, and your position paper.
Answers
Answer:
To back up any statements I make.
To refute any errors presented.
Explanation:
During a group discussion, you look at your notes to point out an error or when you want to flesh out a point you made.
What is a group discussion?The term group discussion has to do with learners talking about a topic in a manner ion which each learner takes a turn to explain a portion of the topic.
During a group discussion, you look at your notes to point out an error or when you want to flesh out a point you made.
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Question 5 of 5
When planning space exploration, scientists face many
challenges. One issue is the weight of the items being
transported. They can use the engineering design process
to help minimize the weight of materials on board a
spacecraft.
You have designed a prototype of a new, lighter material. What should be the
next step in your process?
A. Update your initial design for the new type of material.
B. Test to see
whether your material is strong and works well.
C. Figure out what problems people want to solve.
D. Brainstorm new ways to design materials.
Answers
Answer:B
Explanation: got it right on test
Test to see whether your material is strong and works well should be the next step in your process. Therefore, the correct option is option B.
What is space exploration?Space science and technology are used in space exploration to learn more about the universe. While astronomers use telescopes to explore the universe, both unmanned robotic space missions and human spaceflight also participate in the physical exploration of space.
When planning space exploration, scientists face many challenges. One issue is the weight of the items being transported. They can use the engineering design process to help minimize the weight of materials on board a spacecraft. You have designed a prototype of a new, lighter material. Test to see whether your material is strong and works well should be the next step in your process.
Therefore, the correct option is option B.
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Frost forming on a car's windshield is a chemical change
True or false
Answers
Answer:
True
Explanation:
The reason why is because frost is a result of a chemical reaction
Please help me find the final answer
Answers
Answer:
5. The mass of Na₂CO₃, that will produce 5 g of CO₂ is approximately 12.04 grams of Na₂CO₃
6. The mass of nitrogen gas (N₂) that will react completely with 150 g of hydrogen (H₂) in the production of NH₃ is 693.[tex]\overline{3168}[/tex] grams of N₂
Explanation:
5. The given equation for the formation of carbon dioxide (CO₂) from sodium bicarbonate (Na₂CO₃) is presented as follows;
(Na₂CO₃) + 2HCl → 2NaCl + CO₂ + H₂O
One mole (105.99 g) of Na₂CO₃ produces 1 mole (44.01 g) of CO₂
The mass, 'x' g of Na₂CO₃, that will produce 5 g of CO₂ is given by the law of definite proportions as follows;
[tex]\dfrac{x \ g}{105.99 \ g} = \dfrac{5 \ g}{44.01 \ g}[/tex]
[tex]\therefore {x \ g} = \dfrac{5 \ g}{44.01 \ g} \times 105.99 \ g \approx 12.04 \ g[/tex]
The mass of Na₂CO₃, that will produce 5 g of CO₂, x ≈ 12.04 g
6. The chemical equation for the reaction is presented as follows;
N₂ + 3H₂ → 2NH₃
Therefore, one mole (28.01 g) of nitrogen gas, (N₂), reacts with three moles (3 × 2.02 g) of hydrogen gas (H₂) to produce 2 moles of ammonia (NH₃)
The mass 'x' grams of nitrogen gas (N₂) that will react completely with150 g of hydrogen (H₂) in the production of NH₃ is given as follows;
[tex]\dfrac{x \ g}{28 .01 \ g} = \dfrac{150 \ g}{3 \times 2.02 \ g} = \dfrac{150 \ g}{6.06 \ g}[/tex]
[tex]\therefore \ x \ g= \dfrac{150 \ g}{6.06 \ g} \times 28.01 \ g = 693.\overline {3168} \ g[/tex]
The mass of nitrogen gas (N₂) that will react completely with 150 g of hydrogen (H₂) in the production of NH₃, x = 693.[tex]\overline{3168}[/tex] grams
Which element would you predict to have the highest first ionization energy? Why?
a) neon or carbon
b) fluorine or francium
c) beryllium or strontium
d) iodine or fluorine
Answers
Two students pull a box with force of 100 N to the left and 200 N to the right.
What is the net force and direction in which the box moved?
Answers
Answer:
net force is 100 N and direction is right
Explanation:
An atom will be neutral if which of the following are true of its arrangement of subatomic particles?
The number of its protons is equal to the number of its electrons
All of its electrons orbit its nucleus at exactly the same distance
The sum of the atom's protons and neutrons is greater than zero
The nucleus of the atom contains more neutrons than anything else
Answers
1)Change the following temperatures to Kelvin: 100 C and -20 C
2)Change the following temperatures to Celsius: 273 K and 15 K
Answers
Answer:
373 K; 253 K
0°C ; -258°C
Explanation:
In order to change Temperatures to Absolute Value (Kelvin) you shoud do this sum:
T° in C + 273 = T° in K
For question 1:
100°C + 273 = 373K
-20°C + 273 = 253K
For question 2:
T° K - 273 = T° C
273 K - 273 = 0°C
15 k + 273 = -258 °C
Answer:
-67.8
Explanation:
Which of the following could be an empirical formula? a C2H4 b C4H10 c N2O4 d BaO2
Answers
Answer:
B C4H10 will be the empirical formulae.
1. If you have 5g of pennies how many dozen pennies do you have?
Answers
Answer:
15.69 dozen
Explanation:
Mass of penny = 5 g
Dozens of penny =..?
Next, we shall convert 5 g to gross. This can be obtained as follow:
3824 g = 1000 gross
Therefore,
5 g = 5 g × 1000 gross / 3824 g
5 g = 1.3075 gross
Thus, 5 g is equivalent to 1.3075 gross.
Finally, we convert 1.3075 gross to dozen. This can be obtained as follow:
1 gross = 12 dozen
Therefore,
1.3075 gross = 1.3075 gross × 12 dozen / 1 gross
1.3075 gross = 15.69 dozen
Thus, 5 g of penny is equivalent to 15.69 dozen
the symbol between two reactants in a chemical equation?
Answers
Hope this helps!!
K(s)+H2SO4(aq)
——>_____+______
Answers
K2SO4 + H2
Reason :Potassium is highly reactive
Answer:
K2SO4 + H2 this is the reaction.
each side of a square is 8 by 10 metre find the area of the square
Answers
Answer and Explanation:
I believe the answer is 8
For the reaction between aqueous silver nitrate and aqueous sodium chloride, write each of the following. The products of the reaction are aqueous sodium nitrate and solid silver chloride.
Complete equation
Complete ionic equation
Net ionic equation
Answers
Answer:
A balanced ionic equation shows the reacting ions in a chemical reaction. These equations can be used to represent what happens in precipitation reactions or displacement reactions.
Precipitation reactions
In a typical precipitation reaction, two soluble reactants form an insoluble product and a soluble product.
For example, silver nitrate solution reacts with sodium chloride solution. Insoluble solid silver chloride and sodium nitrate solution form:
AgNO3(aq) + NaCl(aq) → AgCl(s) + NaNO3(aq)
The Na+ ions and NO3- ions remain separate in the sodium nitrate solution and do not form a precipitate. Ions that remain essentially unchanged during a reaction are called spectator ions.This means these can be ignored when writing the ionic equation. Only how the solid silver chloride forms is needed to be shown:
Ag+(aq) + Cl-(aq) → AgCl(s)
In a balanced ionic equation:
the number of positive and negative charges is the same
the numbers of atoms of each element on the left and right are the same
Displacement reactions
Displacement reactions take place when a reactive element displaces a less reactive element from one of its compounds.
A common type of displacement reaction takes place when a reactive metal reacts with the salt of a less reactive metal. For example, copper reacts with silver nitrate solution to produce silver and copper(II) nitrate solution:
2AgNO3(aq) + Cu(s) → 2Ag(s) + Cu(NO3)2(aq)
In this reaction, the NO3- ions remain in the solution and do not react - they are the spectator ions in this reaction. So, they can be removed from the ionic equation:
2Ag+(aq) + Cu(s) → 2Ag(s) + Cu2+(aq)
Question
Explain why this ionic equation is balanced:
Ba2+(aq) + SO42-(aq) → BaSO4(s)
Hide answer
There are the same numbers of atoms of each element on both sides of the equation. The total charge on both sides is also the same (zero).
Question
Balance this ionic equation, which represents the formation of a silver carbonate precipitate:
Ag+(aq) + CO32-(aq) → Ag2CO3(s)
Hide answer
2Ag+(aq) + CO32-(aq) → Ag2CO3(s)
Question
Balance this ionic equation, which represents the displacement of iodine from iodide ions by chlorine:
Cl2(aq) + I-(aq) → I2(aq) + Cl-(aq)
Hide answer
Cl2(aq) + 2I-(aq) → I2(aq) + 2Cl-(aq
Explanation:
this will help, I used this for my work x
AgNO₃ (aq) + NaCl (aq) → AgCl (s) + NaNO₃(aq) is the complete chemical equation taking place between the 2 reactants.
Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
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Hey. Can someone, please help me with the following questions:
Satellites
Satellites ___________the earth.
You can see _____________ _______________ without a telescope.
An example of a man made satellite is the _____________ _____________ _____________.
The only natural satellite of the earth is the __________.
Choose from: moon, orbit, natural satellites, international space station
Planets
There are ________ planets you can see with the __________ __________.
The five planets are, _________, ___________, ___________, ___________, ___________.
The planets are part of the ___________ ___________.
Light from Saturn takes around ___________ hours to reach earth.
Choose from: 1,5, naked eye, solar system, Mercury, Venus, Mars, Jupiter, Saturn
Comets and Meteors
A _________ is a spectacular sight in the _________ sky.
They are _______ to see and could be described as giant ___________ that orbit the _______.
__________ are bits of dust and _________ that _______ up as they move through the earth’s ____________. A meteor that makes it to earth is called a ______________.
Galaxies
1. What are most of the dots of light that we see in the sky?
2. What is the name of our home galaxy?
3. What is the name of our nearest star?
4. How long does it take the light from the sun to reach the earth?
5. Can you say what some of the other dots of light in the night sky might be?
6. How many stars might there be in one galaxy?
7. What is the name of our nearest neighbor galaxy?
8. State how long it takes for the light from our neighbor galaxy to reach the earth
Answers
5, naked eye, Mercy, Venus, Mars, Jupiter, Saturn, solar system, 1
I would need to see the choices for this section
1.Stars
2. The Milky Way
3. The sun
4.8 minutes
5. Satellites
6. 100 thousand million
7. Canis Major Dwarf Galaxy
8. 10s of thousands of years
Can someone help me Balance chemical equations please
Answers
Hopes this helps <33
3. What tool do we use to measure force?
Answers
Answer:
A force meter
Calculate the number of moles of gas that occupy a 16L container at a pressure of 3 atm and a temperature of 48oC
Answers
Answer:
1.81
Explanation:
3*16=n(0.0821)(48+273)
hlo ;) lol im banned and my name is kimboslicer it is so sad my accout is bloked 4 23:12
Answers
Answer:
lol im sorry man
Explanation:
Answer:
My old acc got banned
Explanation:
What is the molar mass of the following compound: C1H3P2
Answers
Why do metal boats float?
Answers
Answer:
I hope this will help you
Explanation:
The air that is inside a ship is much less dense than water. That's what keeps it floating! The average density of the total volume of the ship and everything inside of it (including the air) must be less than the same volume of water.
Please make me brilliant
what is electron cloud?