Answer:
3 atoms
Explanation:
"In one mole of Barium, there are 3 x [tex]N_{A}[/tex] barium and chlorine atoms, where [tex]N_{A}[/tex] is Avagadro's Number, 6.022 x [tex]10^{23}[/tex] " - anor277 via Socratic
True or false: SOLIDS have a definite shape, a definite volume, and cannot flow.
This statement is true.
Answer:
true
Explanation:
because solids have strong intermolecular force of attraction so they have definite shape and volume and cannot flow
How many moles of na2co3 are necessary to reach stoichiometric quantities? Then determine how many grams of Na2CO3 are necessary to reach stoichiometric quantities.
Answer:
0.0102 moles Na₂CO₃ = 1.08g of Na₂CO₃ are necessaries
Explanation:
Based on the reaction
CaCl₂ + Na₂CO₃ → 2NaCl + CaCO₃
1 mole of CaCl₂ reacts per mole of Na₂CO₃
calculate how many moles of CaCl2•2H2O are present in 1.50 g...
To solve this question we must find the moles of CaCl2•2H2O using its molar mass (147.0146g/mol). These moles = Moles CaCl₂ = Moles of Na₂CO₃ necessaries to reach sotoichiometric quantities. To find then the mass we must use molar mass of Na₂CO₃ (105.99g/mol):
Moles CaCl₂.2H₂O:
1.50g * (1mol / 147.0146g) = 0.0102 moles CaCl₂.2H₂O = 0.0102moles CaCl₂
Moles Na₂CO₃:
0.0102 moles Na₂CO₃Mass Na₂CO₃:
0.0102 moles * (105.99g / mol) =
1.08g of Na₂CO₃ are presentThe potential energy diagram for a reaction starts at 180 kJ and ends at 300 kJ. What type of reaction does the diagram best represent? (5 points)
Exothermic reaction
Endothermic reaction
Reaction between two solids
Reaction between two liquids
Answer:
Exothermic reaction
Explanation:
An exothermic process releases heat, causing the temperature of the immediate surroundings to rise
The potential energy diagram for a reaction starts at 180 kJ and ends at 300 kJ. the type of reaction does the diagram best represent exothermic reaction.
What is exothermic reaction?An exothermic reaction would be one in which heat energy is emitted. Exo stands for "evolve out." The term "thermos" refers to a container that holds heat. The term "exothermic" refers to a process in which heat is produced. In general, an exothermic reaction is one in which heat is released as a byproduct.
Therefore, the reaction diagram will represent exothermic reaction.
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What is the correct equilibrium constant expression for equation P2(g)
2 F20(g) = 2 PO(g) + 2 F2(g) ?
Answer:
k = [F2]² [PO]² / [P2] [F2O]²
Explanation:
In a chemical equilibrium, the equilibrium constant expression is written as the ratio between the molar concentration of the products over the molar concentration of the reactants. Each species powered to its reaction coefficient. For the equilibrium:
P2(g) + 2F2O(g) ⇄ 2PO(g) + 2F2(g)
The equilibrium constant, k, is:
k = [F2]² [PO]² / [P2] [F2O]²
Describe Covalent bond.
Answer:
The bond formed between 2 or more elements by sharing of electrons is called covalent bond
for ex, let's say Carbon, element of group 14 , it requires 4 electrons to complete it's octate it's valency is 4, now either it can donate 4 electrons to some other element or gain from others. but in both case it requires too much energy so, it neither loose the electrons nor gain, it shares its 4 electrons and formed a constant bond ex - ccl4, ch4 Bond formed by sharing of electron - covalent bond bond formed by gaining or loosing of electron is ionic bond.The symbols for elements with atomic numbers 4, 9, 16, & 17 are? (Respectively)
Answer:
the answer is 4=Be 9 =F 16=S 17 = CL
Explanation:
atomic no 4 = beryllium (Be)
" " 9 = fluorine (F)
16 = sulfur (S)
17 = chlorine (CL)
The atomic number of Beryllium is 4, the atomic number of fluorine is 9, atomic number of sulfur is 16 and the atomic number of chlorine is 17.
What is atomic number?The atomic number is defined as the number of protons in the nucleus of an atom or the number of electrons revolving around the nucleus in orbits or shell.
So we can conclude that he atomic number of Beryllium is 4, the atomic number of fluorine is 9, atomic number of sulfur is 16 and the atomic number of chlorine is 17.
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How is coal extracted?
How do Humans use it?
What are the benefits?
Coal is extracted by mining.
Once coal has been extracted, it can be used directly for heating and industrial processes or to fuel power plants for electricity.
Benefits are:
Coal energy is an affordable energy source because of the coal's stable price compared to other fuel sources.
Coal is easy to burn.
Coal produces high energy upon combustion.
Coal energy is inexpensive.
Which car has the highest kinetic energy if each car is traveling at a speed of 1 m/s? Explain how you arrived at your answer.
Car a is going 2 KG
Car B 4KG
Car c 6KG
Car D 8KG
Car D
Because it is the heaviest. Kinetic energy is directly proportional to the velocity and mass of the object. All the cars have the same velocity. But Car D has the most mass. So, it has most kinetic energy, because more the mass more the energy.
(b) Two containers made of Insulating material contain the same volume of water at roorh
temperature. The containers do not have lids. The volume of liquid in each container graduall- decreases.
(i) After a certain time, the temperature of the water has decreased to below room
temperature.
Explain, in terms of molecules, why the temperature has decreased.
(ii) One of the containers is wide and shallow. The other container is narrow and deep.
Predict which container has the greater rate of cooling. Explain your answer.
Answer:
See Explanation
Explanation:
Evaporation is an endothermic process, an endothermic process is one in which energy is absorbed from the surrounding thereby making the system to be at a lower temperature compared to the environment.
Being an exothermic process, molecules take away energy from the liquid surface as they escape from the liquid surface hence, evaporation causes the temperature of the water to be decreased below room temperature.
The rate of evaporation and cooling depends on the surface area of liquid. The liquid in the wide and shallow container has a greater rate of cooling because it has a greater surface area than the liquid in the narrow and deep container.
How many atoms are there in 20.00 moles of calcium (Ca)?
Answer:
20 x (6.022 x 10^23) atoms in 20 moles of Calcium.
Explanation:
A mole contains 6.022 x 10^23 atoms, which is also known as Avogadro's number, and this number is same for each element. So, there are 20 x (6.022 x 10^23) atoms in 20 moles of Calcium.
The number of atoms are there in 20 moles of calcium is 120.4 × 10²³.
What is Avogadro's number?Avogadro's number is the number which is equal to the number of atoms of any substance that are present in one mole of that substance, and it is equal to 6.022 × 10²³.
Given moles of calcium = 20 moles
So, number of atoms in given moles of calcium will be calculated as:
No. of Ca in 20 mol = 20mol × 6.022 × 10²³ atoms/mol = 120.4 × 10²³ atoms
Hence required atoms of calcium is 120.4 × 10²³.
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The process by which particles in a solution spread out evenly is called?
Answer:
this is your answer.....
Please answer correctly
the choice i marked is wrong
Answer:
the sample is a homogeneous mixture
Explanation:
i hope this is correct SO sorry if it is wrong
Answer:
th answer is the sample is homoheneous mixture.
Explanation:
sorry if it,s wron.
How much NaNO3 can dissolve at 70°C in 100g of water?
CuFeS2 + 3 CuCl2 --> 4 CuCl + FeCl2 + 2 S How many mL of 0.075 M CuCl2 are needed to titrate 0.20 grams of CuFeS2?
Answer:
[tex]V_{CuCl_2 }= 43.6mL[/tex]
Explanation:
Hello there!
In this case, according to this titration problem, it is possible to note there is a 1:3 mole ratio of CuFeS2 to CuCl2; it means that we can use the following equation:
[tex]3*n_{CuFeS_2}=n_{CuCl_2 }[/tex]
Thus, by introducing the mass and molar mass of the former and the volume and concentration of the latter, we write:
[tex]3*0.20gCuFeS_2*\frac{1mol}{183.51g} =V_{CuCl_2 }*0.075\frac{mol}{L} \\\\V_{CuCl_2 }=\frac{0.00327mol}{0.075mol/L}*\frac{1000mL}{1L} \\\\V_{CuCl_2 }= 43.6mL[/tex]
Regards!
Which of the following naming systems would you use to nameH2SO4?
Question 7 options:
a)
________________IC ACID
b)
HYDROGEN _________IDE
c)
________________OUS ACID
d)
HYDRO________IC ACID
Answer:
A
Explanation:
H2SO4 name is Sulfuric Acid. I hoped that helped !
A solute dissolved in water will cause
A the boiling point to increase
B the freezing point to increase
C the melting point to increase
D the boling point to decrease
(It’s A)
Answer:
A the boiling point to increase
Explanation:
That is a colligative property
A solution with a pOH of 4.3 has a [H+] of ??
please help
Answer:
A solution with a pOH of 4.3 has a [H+] of 2*10⁻¹⁰ M.
Explanation:
The pOH (or potential OH) is a measure of the basicity or alkalinity of a solution.
pOH indicates the concentration of hydroxyl ions [OH-] present in a solution. It is defined as the negative logarithm of the activity of hydroxide ions. That is, the concentration of OH- ions:
pOH= -log [OH-]
On the other hand, pH is also a measure of the basicity or alkalinity of a solution. POH is an indicator that is related to pH by:
pOH + pH= 14
So, if the solution has a pOH equal to 4.3, the pH is calculated by:
4.3 + pH= 14
pH= 14 - 4.3
pH= 9.7
The pH is defined as the logarithm of the concentration of H+ ions, with the sign changed:
pH= -log [H+]
So, in this case:
9.7= - log[H+]
Solving
[H+]= 2*10⁻¹⁰ M
A solution with a pOH of 4.3 has a [H+] of 2*10⁻¹⁰ M.
What would be the volume of 0.500 mole of an
ideal gas at STP
What can the rock layers tell us about life on Earth?
Explanation:
The location of fossils in rock layers provides evidence of Earth's past landscapes. ... Scientists use a technique called radiocarbon dating to find out the age of the fossils. Once they know the age of the fossil in the rock, they also know that rock itself is about the same age!
can somebody help me with this.
Answer:
HI
H₂O
H₃O⁺
I⁻
Explanation:
Bronsted-Lowry acids are chemicals that can donate protons, and Bronsted-Lowry bases are chemicals that can accept them. Conjugate bases and acids are the resulting effect of losing or gaining a proton in the form of H⁺.
The number of molecules of ammonia, NH₃, in water solution required for complete ionization of one molecule of sulfuric acid, H₂SO₄, is
1
2
3
4
6
Please Explain!!!
Answer:
6 that will be the answer
3. (05.02 MC)
What is the mass of a sample of NH3 containing 3.80 x 1024 molecules of NH3? (5 points)
74.8 grams
89.4 grams
101 grams
107 grams
Answer:
107 g
Explanation:
need to divide by avogadro’s number
The mass of a substance is a weight that can be given by the moles. In the sample 107.27 gms of ammonia is present. Thus, option D is correct.
What is mass?Mass or the weight of the substance can be given by the molar mass and the moles of the substance.
We know,
6.02214076 × 10²³ molecules = 1 mole of NH₃
So, 3.80 x 10²⁴ molecules = 6.31 moles
If 1 mole = 17 gm ammonia
Then, 6.31 moles = 6.31 × 17 = 107 gms
Therefore, option D. 107 gms is the mass of ammonia.
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10) Which preparation produces a 2.0 M solution of Co
H1206? [molecular mass = 180.0]
(A) 180.0 g of C6H12O6 dissolved in 1000. mL of
solution
(B) 90.0 g of C6H1206 dissolved in 1000. mL of
solution
(C) 180.0 g of C6H1206 dissolved in 500.0 mL of
solution
(D) 90.0 g of C6H1206 dissolved in 500.0 mL of
solution
Answer:
(C) 180.0 g of C6H12O6 dissolved in 500.0 mL of solution
Explanation:
Molarity is mole/volume.
1. Find the mass of C6H12O6 in 1 Liter of 2.0 solution
(2 mol C6H12O6 / L) * (180 g / mol C6H12O6) = 360 g C6H12O6
There are 360 g C6H12O6 in 1000 mL of solution
2. Compare the value you found in step 1 to each of the multiple choice answers.
180.0 g of C6H12O6 dissolved in 500.0 mL of solution is exactly proportional to 360 g C6H12O6 in 1000 mL of solution.
The preparation which produces a 2.0 M solution of C₆H₁₂O₆ is 180.0 g of C₆H₁₂O₆ dissolved in 500.0 mL of solution.
How molarity is calculated?Molarity is defined as the number of moles of solute present in per liter of solution.
Moles of any substance will be calculated as :
n = W/M, where
W = given mass
M = molar mass
In the question given that molar mass of C₆H₁₂O₆ is 180 g/mole, and let we have produced the solution of 2 molarity by these amount in 1 liter i.e.
2 = n/1
n = 2 moles
Now by using these moles we can calculate the required mass of C₆H₁₂O₆ as:
2 = W/180
W = 360g
From this it is clear that for the preparation of 1 liter of solution of 2 molarity 360g of C₆H₁₂O₆ is required. So in 500mL of solution, 180 g of C₆H₁₂O₆ will use.
Hence, option (C) is correct i.e. 180.0 g of C₆H₁₂O₆ dissolved in 500.0 mL of solution.
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What is the pH of 1.0 M KOH solution?
Answer:
pH = 14
Explanation:
pOH = -log[OH-] = -log1,0 = 0
pH + pOH = 14
pH = 14 - pOH = 14 - 0 = 14
Answer:
pH= 14Explanation:
hope it helps
#CARRYONLEARNING3.A chair will move by itself because of its inertia.True or False.
Answer:
false
Explanation:
Inertia is the resistance of any physical object to any change in its velocity, so it can't move by itself. Only by a different entity.
Answer: False
Explanation: In order to understand this, you need to understand what inertia means. In short, inertia is a property of matter by which it continues in its existing state of rest or uniform motion in a straight line, unless that state is changed by an external force.
Methane, a highly flammable gas, is placed in a piston that has a volume of 2.1
L at STP. The piston then compresses the gas to 125 mL. What is the pressure
inside of the piston?
Two reasons that a plant from a rain forest would not survive in a desert home?
Answer: A planet from a rain forest would not survive in a desert home, for the fact they depend on water and as these live from water, without it, this leads to dehydration and with loss of water with plants, nothing is able to survive when it comes to a rain forest plant being in a desert home. Another reason is the high trees and leaves that are providing the plants enough sunlight or shade to grow, it guarantees to help keep the temperature normal. Being in a deserted area would mean that there would be a temperature change, something the plant is not used to. Without that needed shade and avoiding the scorching sun, they will die out from how different the temperature is, and how hot it is.
Explanation: I hope this helped you.
okay, the answer should be simple and easy, plants from a rainforest would not survive in a desert because the plants in the rainforest do get water, sunlight and air whereas the plants in the desert have Sunlight which is very hot. so if a plant in the rainforest was transferred to the desert it will hard to survive and it will eventually die because they will not get water that will be needed and the plant can get sunburns with the too hot temperature.
Which of the following is a DIFFERENCE between electricity and magnetism?
It is possible to have single positive or negative electric charges, but magnetic poles always come in pairs
Electricity can be observed, but magnetism cannot
Opposite electric charges attract and like repel; like magnetic charges attract and opposites repel
Electric forces have a field associated with them; magnetism does not
Answer:
the major difference between electricity and magnetism is it presence of magnetism and electricity give you present in a static charge of magnetism president is only felt when they are moving charge as a result of electricity
Help balance (will mark brainliest)
For which substance is the standard heat of formation not equal to zero?
Hydrogen (H2)
Aluminum oxide (Al2O3)
Oxygen (O2)
Potassium (K)
Answer:
Aluminum oxide (Al₂O₃)
Explanation:
The standard heat (or enthalpy) of formation of a compound, is the amount of change in the enthalpy that takes place when 1 mole of the compound is produced from the elements it contains whereby the compounds and elements in the reaction are in their standard states
The standard state of an element, is the state in which the element is in the most stable form at a pressure of 1 bar
Therefore, the heat of formation of hydrogen, H₂, oxygen, O₂, and potassium, (K), will have a heat of formation of zero, while Al₂O₃ which is made of aluminum and oxygen in combining to form a compound in proportions which are different from their initial standard states will have a heat of formation not equal to zero