Explanation:
MgCl2(aq) + NaOH(aq) = Mg(OH)2(s) + NaCl. Both magnesium nitrate and sodium hydroxide solutions are colourless solutions. When they react with each other, a white precipitate (Mg(OH)2) and a colourless solution is given. Sodium chloride exists in the colourless aqueous solution.
Jenny tells her teacher that most liquids expand when they freeze into solids because the particles in the liquid gain energy and move farther apart. Is she correct why or why not
Jenny tells her teacher that most liquids expand when they freeze into solids because the particles in the liquid gain energy is False.
What is Freezing?This is the type of matter change which is characterized by a liquid turning into a solid.
The particles lose energy and the molecules move closer to each other which is why False was chosen.
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How many grams of LiOH are needed to make 25 mL of a 0.125 M solution?
Please explain because I have no idea how to solve this
Answer:
0.0734 grams LiOH
Explanation:
The molarity formula looks like this:
Molarity (M) = moles / volume (L)
You are given the molarity and volume (in mL). Therefore, you can plug these values into the equation and solve for moles (after you convert from mL to L).
25 mL / 1,000 = 0.025 L
0.125 M = moles / 0.025 L
(0.125 M) x (0.025 L) = moles
0.003125 = moles
After using the molarity formula, we know that 0.003125 moles LiOH are needed to satisfy these conditions. Now, we can convert this to grams using the molar mass of LiOH. This can be determined using the values from the periodic table. Remember to write your conversion in a way that allows for the units to cancel out.
Molar Mass (LiOH) = 6.941 g/mol + 16.00 g/mol + 1.008 g/mol
Molar Mass (LiOH) = 23.499 g/mol
0.003125 moles 23.499 g
------------------------ x ------------------- = 0.0734 grams LiOH
1 mole
0.074 grams of lithium hydroxide are needed to make 25 ml of 0.125 M solution, according to the concept of molar concentration.
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.
Here , in the problem mass is to be determined, hence the formula used is the first one mentioned.
Substituting values in the formula,mass=molar concentration×molar mass×volume in liters
∴0.125×23.95×0.025=0.074 g.
Hence, 0.074 g of lithium hydroxide are required to prepare 25 ml of 0.125 M solution.
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what occurs when the moon moves through Earth's shadow
Answer:
A Lunar eclipse
Explanation:
A Lunar eclipse occurs only when the sun,earth and moon are exactly aligned with earth .
This can be viewed twice in calendar years.
It's a Lunar Eclipse.
A lunar eclipse is the blocking of sunlight to the moon that occurs when Earth is directly between the sun and the moon. A lunar eclipse occurs when the Moon enters the Earth's shadow. A solar eclipse occurs when the Moon's shadow falls on the Earth. They do not happen every month because the Earth's orbit around the sun is not in the same plane as the Moon's orbit around the Earth.
Nitrogen gas was collected by water displacement. What was pressure of the N, collected if the temperature was 22 °C?
The pressure of the N₂ collected if the temperature was 22°C celcius is 98.6823 kPa.
What is atmospheric pressure?
The air around you has weight, and it presses against everything it touches. That pressure is called atmospheric pressure, or air pressure.
Atmospheric pressure = 101.325 kPa
Vapor pressure of water at 22°C = 2.6427 kPa
Pressure of N₂ = (Atmospheric pressure) - (vapour pressure of water at 22°C)
Pressure of N₂ = (101.325 kPa) - ( 2.6427 kPa)
Pressure of N₂ = 98.6823 kPa
Therefore, the pressure of the N₂ collected if the temperature was 22°C celcius is 98.6823 kPa.
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What is the boiling point of liquid c when the
Answer:
100 degree is the answer of given statement
Which type of solid has the weakest forces holding it together?
lonic
Network
Molecular
Metallic
Answer:
network
Explanation:
ionic is strongest
chegg
A network is the type of solid that has the weakest forces holding it together.
What is it meant by the network?A network, in computing, is a group of two or extra gadgets or nodes that could talk. The gadgets or nodes in question can be connected through physical or wi-fi connections. The key is that there are at least separate components, and they may be connected.
A home wireless LAN (wireless local area network, or Wi-Fi network) is a good example of a small client-server network. Various devices in the home are wirelessly connected to a router that acts as the central node (server) in the home.
A network is a collection of computers, servers, mainframes, community gadgets, peripherals, or other devices related to permitting facts sharing. An example of a network is the net, which connects hundreds of thousands of people everywhere in the global.
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If a 1.75 liter solution contains 0.877 moles of CuCO3, what is the molarity?
Answer:
0.50 Molar or 0.50 Mol/L
Explanation:
Molarity = [tex]\frac{Moles of Solute}{Litres of solution}[/tex]
Molarity = n / V
Given: Volume of solution(V): 1.75 Litres
Moles of solute(n): 0.877
Substituting values,
Solution:
Molarity = [tex]\frac{0.877}{1.75}[/tex]
Molarity = 0.50 Molar (rounded off to the nearest decimal place)
∴ Molarity = 0.50 Molar/ 0.50 Mol/L
What branch of chemistry studies the flow of electrons?
A. Inorganic chemistry
B. Electrochemistry
C. Quantum chemistry
D. Organic chemistry
Answer:
Your answer is B, Electrochemistry!
Explanation:
This is the part of chemistry that studies the chemical process in which electrons flow. This flow is called electricity. Electricity is generated by the flow of electrons, from one element to another element. This reaction is called oxidation reduction.
Answer: B
Explanation:
The substance that dissolves the solute
A) Solubility
B) Solvent
C) Solute
Answer:
Solvent
Explanation:
Solvent dissolves solute resulting in the formation of a solution.
Answer:
B) Solvent
Explanation:
In forming a solution, the substance which dissolves the solute is called the solvent.
What will most likely cause a sudden wind to start blowing? Help ;-;
A. Clouds
B. Humidity
C. Precipitation
D. Air pressure
it is D. Air pressure!!! :)
What is the specific heat of a substance if a mass of 10.0 kg increases in temperature from 10.0°c to 70.0°c when 2,520 j of heat is applied? use q equals m c subscript p delta t.. 0.00420 j/(gi°c) 0.00661 j/(gi°c) 238 j/(gi°c) 252 j/(gi°c)
Answer:
0.00420
Explanation:
The equation is Q=mc(T(final)-T(initial), where c is the specific heat, Q is heat supplied, m is mass, T(final) is final temperature and T(initial) is initial temperature (you'll see this written as delta T, which means change in temperature).
2520 = Q
m = 10.0kg; answer choices are in g, not kg, so multiply by 1000 to get m in g; m = 10000 g
Plug in the values you have and solve for c.
2520=(10000)(c)(70-10)
2520=600000c
c=0.0042 j/(gc)
Answer:
4.2 j/kg-C = .0042 j / (g-C)
Explanation:
Specific heat units are j / kg-C
2520 J / [ (10 kg)(70-10 C)] = 4.2 j / kg-C
1
2
3
4
5
LO
6
7
B
8
9
10
Which functional group is found in an ester?
O=0
R R
O=0
o
с
/
R
OR'
R- OH
O
Answer:
second option
O=C-OR
R
Explanation:
ester: A compound most often formed by the condensation of an alcohol and an acid, with elimination of water. It contains the functional group C=O. joined via carbon to another oxygen atom.
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A tank (not rigid) contains 2.3L of
helium gas at 25°C. What will be the
volume of the tank after heating it
and its content to 40°C temperature
at constant pressure?
Given:
Unknown:
Formula:
Solution:
Final Answer:
Convert
Temp to Kelvin25°C=298K40°C=313KApply Charles law
V1T2=V2T12.3(313)=298V2719.9=298V2V2=2.4LAnswer:
See below ~
Explanation:
Q1
Given :
V₁ = 2.3LT₁ = 25°C = 298 KT₂ = 40°C = 313 KUnknown :
V₂Formula :
V₁/T₁ = V₂/T₂ (Charles Law)Solution :
2.3/298 = V₂/313V₂ = 313/298 x 2.3V₂ = 1.05 x 2.3V₂ = 2.42 LFinal Answer :
2.42 LQ2
Given :
P₁ = 1.01 atmV₁ = 6 LV₂ = 3 LUnknown :
V₂Formula :
P₁V₁ = P₂V₂Solution :
1.01 x 6 = P₂ x 3P₂ = 1.01 x 2P₂ = 2.02 atmFinal Answer :
2.02 atmHow many molecules ?
Answer:
42 millions of single cells
What mass of Al2O3 is formed in the reaction of 4700 kg of aluminum?
Answer in units of kg
Answer:
2350kg of Al₂O₃
Explanation:
Step 1 : Write the balanced chemical equation:
4Al + 3O₂ → 2Al₂O₃
Step 2: Find the Ratio of Al : Al₂O₃
Al : Al₂O₃
4 : 2
2 : 1
4700: 2350
= 2350kg of Al₂O₃
Define ionization energy. Describe how ionization energy impacts ionic bonding.
Answer: I can’t explain how it impacts ionic bonding but I can tell you what ionization energy is.
Explanation:
ionization energy, also called ionization potential, in chemistry and physics, the amount of energy required to remove an electron from an isolated atom or molecule.
what is the most important thing to know about the general term "discrepant event"?
Answer:
Discrepant events — demonstrations that produce unexpected outcomes — are used in science to capture students' attention and to confront their beliefs about a “phenomenon by producing an outcome which is contrary to what their previous experiences would lead them to believe is true” (Misiti, 2000, p.
How many moles of carbon are in a sample of C4H10 that also contains 200 g of hydrogen?
Select one:
O a. 80.0
O b. 800
O c. 41.6
O d. 416
e.
960.8
The number of moles of carbon in a sample of C4H10 that also contains 200 g of hydrogen is 80 moles.
How to calculate number of moles?The number of moles of a substance can be calculated by dividing the mass of the substance by its molar mass.
According to this question, a sample of C4H10 was given meaning that the ratio of carbon to hydrogen is 4:10.
If 200 g of hydrogen is contained in the sample, then 200 × 4/10 = 80g of carbon is present.
no of moles of C = 80
Therefore, the number of moles of carbon in a sample of C4H10 that also contains 200 g of hydrogen is 80 moles.
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0.0030 x 8.65=
report answer to correct number of significant figures.
The result of 0.0030 x 8.65 to the correct number of significant figures is 0.02595. Details about multiplication can be found below.
What is multiplication?Multiplication is the process of computing the sum of a number with itself a specified number of times, or any other analogous binary operation that combines other mathematical objects.
Multiplication as an operation increases a number.
According to this question, the following expression is given: 0.0030 x 8.65 = 0.02595
Therefore, the result of 0.0030 x 8.65 to the correct number of significant figures is 0.02595.
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If an atom has 7 protons, 8 neutrons, and 10 electrons, then it has a net charge of . On the other hand, if an atom has 3 protons, 3 neutrons, and 2 electrons, its net charge is .
Answer:
Neutrons play no role in the net charge of an atom, so you can ignore them here.
Proton = 7
Electron = 10
Net Charge = 7 - 10
= -3
Again,
Proton = 3
Electron = 2
Net Charge = 3 - 2
= 1
what is the molarity of a solution in which 0.381 moles of CuCl is dissolved in 1039ml of water
Answer:
= 0.366 M
Explanation:
data;
moles = 0.381 moles
volume = 1039ml
= 1039 / 1000
= 1.039dm^3
molarity = ?
solution
molarity = [tex]\frac{moles}{volume in dm^3}[/tex]
= 0.381 / 1.039
molarity = 0.366 M
The chemical reaction that is produced by modelage masks causes:
Answer:
an increase in temperature
Explanation:
The chemical reaction that is produced by modelage masks causes: an increase in temperature
Calculate the molarity of 0.060 moles NaHCO3 in 1500. mL of solution
Answer:
= 0.4 M
Explanation:
data:
moles = 0.060 moles
volume = 1500 ml
= 1500 / 1000
= 1.5 dm^3
solution;
molarity = [tex]\frac{no. of moles}{volume in dm^3}[/tex]
= 0.060 / 1.5
molarity = 0.4 M
What is the [H+] in a solution if the [OH-] = 5.42 x 10-5 M
The hydrogen ion concentration is [tex]\rm[H^{+} ] = 1.8 \times 10^{-10}[/tex] M .
What is pH scale ?The pH scale is used to rank solutions in terms of how acidic or how basic they are.
It indicates the concentration of hydrogen ions (H+) and hydroxide ions (OH-) in a solution.
These ion concentrations are equal in pure water, which has a pH of 7.
The hydrogen ion and hydroxide ion are related as
[tex]\rm[H^{+} ] = \dfrac{1 \;\times 10^{-14} }{[OH^{-}] }[/tex]
[tex]\rm[H^{+} ] = \dfrac{1 \;\times 10^{-14} }{[5.42\times10^{-5} ] }[/tex]
[tex]\rm[H^{+} ] = 1.8 \times 10^{-10}[/tex] M
The hydrogen ion concentration is [tex]\rm[H^{+} ] = 1.8 \times 10^{-10}[/tex] M .
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7. Which is an example of a good insulator?
iron
copper
silver
rubber
Answer:
Rubber is an insulator.
Remaining three are metals and hence conductors.
Clarence grew three bearded iris plants. He put one in direct sunlight, one in
the shade, and one in the dark. The plant in the sun grew the most quickly and
looked the healthiest. Clarence concluded that bearded iris plants grow best
in the sun.
How would you evaluate Clarence's conclusion?
A. His conclusion is valid because his experiment included a control.
B. His conclusion is flawed because it is based on the appearance of the plants
C. His conclusion is flawed because he did not perform enough trails
D. His conclusion is bailed because he tested only one variable
A gas at 131.0 kPa and 28.0°C fills a flexible container with an initial volume of 2.88 L. If the temperature
is raised to 69.4°C and the pressure increased to 451.0 kPa, what is the new volume in Liters?
(Show all work)
0.837
0.723
0.952
O 0.761
Apply combine gas law
P1V1/T1=P2V2/T2131(2.88)/(273+28)=451V2/(273+69.4)131(2.88)/301=451V2/341.6V2=10.2LA state government is trying to decide between using biomass or nuclear power to generate electricity. What advantage does biomass have over nuclear power?
0
A. Biomass does not produce pollution
0
B. Biomass releases less carbon dioxide.
0
C. Biomass is a nonrenewable source.
A
D. Biomass produces no radioactive waste
Answer:
D Biomass produces no radioactive waste
Explanation:
When the equation
_Pb2+ + Au²+ →__pb4+ + _Au
is correctly balanced using the smallest whole-number coefficients, the coefficient of Pb2+ will be
1.1
2.2
3.3
4.4
Submit Answer
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The answer is option 2 , the smallest whole-number coefficients, the coefficient of Pb²⁺ will be 2.
What is a Balanced Chemical Equation ?
Law of conservation of mass states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form.
This also means that total mass on the reactant side must be equal to the total mass on the product side.
There are two types of numbers that appear in chemical equations.
There are subscripts, which are part of the chemical formulas of the reactants and products;
and there are coefficients that are placed in front of the formulas to indicate how many molecules of that substance is used or produced.
Balance The Equation:
Pb²⁺ + Au²⁺ = Pb⁴⁺ + Au
Label Each Compound With a Variable
Label each compound with a variable to represent the unknown coefficients.
aPb²⁺ + bAu²⁺ = c Pb⁴⁺ + d Au
Create a System of Equations
Create an equation for each element where each term represents the number of atoms of the element in each reactant or product.
Pb: 2a + 0b = 4c + 0d
Au: 0a + 2b = 0c + 1d
e: 0a + -1b = -1c + 0d
2a - 4c = 0
2b - 1d = 0
-1b + 1c = 0
Solve For All Variables
Use substitution,
Substitute Coefficients and Verify Result
2Pb²⁺ + Au²⁺ = Pb⁴⁺ + 2 Au
So the answer is 2 , option 2
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100 POINTS! HELP ME IF YOU LOVE JESUS!
A solution contains 150 g of water and 55 g of sodium chloride is at 80℃. Will all of the salt be dissolved into the water? Mathematically explain your answer.
