Answer:
0.354L
Explanation:
Given parameters:
Molarity of KCN = 0.025M
Number of moles = 8.84 x 10⁻³mol
Unknown:
Volume of KCN = ?
Solution:
The molarity of a substance is expressed as;
Molarity = [tex]\frac{number of moles }{volume }[/tex]
Volume of KCN = [tex]\frac{number of moles }{molarity}[/tex]
Now insert the parameters and solve;
Volume of KCN = [tex]\frac{0.00884}{0.025}[/tex] = 0.354L
Down a group, the electron shielding tends to________
a.)increase
b.)decrease
thank uuu :)
Answer:
A
Explanation The number of energy levels (n) increases, and so does the distance between the nucleus and the outermost orbital. The increased distance and the increased shielding weaken the nuclear attraction, and so an atom can't attract electrons as strongly.
I NEED THIS ASAP PLEASEE
what is the partial pressure of nitrogen dioxide gas in psi in a sealed vessel that has a total pressure of 2558 psi and partial pressures of 54.6 bar for carbon dioxide?
Answer:
121.8bar
Explanation:
The partial pressure is the pressure a gas would exert if it were alone in the volume of the gas mixture;
Given parameters:
Total pressure = 2558psi
Partial pressure of carbon dioxide = 54.6bar
Unknown:
Partial pressure of nitrogen dioxide gas = ?
Solution:
Total pressure = partial pressure of carbon dioxide + partial pressure of nitrogen dioxide gas
Let us convert from psi to bar;
14.504psi = 1 bar
2558psi = [tex]\frac{2558}{14.504}[/tex] = 176.37bar
Now;
Partial pressure of nitrogen oxide = 176.37bar - 54.6bar = 121.8bar
Answer:
1766 psi
Explanation:
The first step is to convert 54.6 bar into psi units, which is aproximately 791.9 psi. Next, subtract that from 2558 psi and you will get about 1766 psi.
how many equivalent statements are needed to convert 23.4 Gm into mm? 20 points!
Answer:
23.4 x 10¹²mm
Explanation:
Given problem;
Convert Gm to mm;
Gm = Gigameters
mm = millimeters
1 Gigameter = 1 x 10⁹m
1000mm = 1 m
To convert from Gm to mm;
23.4 Gm x [tex]\frac{1 x 10^{9} m}{1Gm}[/tex] x [tex]\frac{1000mm}{1m}[/tex] = 23.4 x 1 x 10⁹ x 10³ =
= 23.4 x 10¹²mm
If a sample of nitrogen gas is compressed to fit in a smaller container, what happens to the
pressure, assuming the temperature remains constant?
Answer:
The pressure increases
Explanation:
In this action it is best to apply Boyle's law to resolve the problem. This is an interplay between Volume, Pressure and Temperature.
According to Boyle's Law "the volume of a fixed mass of a gas varies inversely as the pressure changes, if the temperature is constant". Since the volume is being reduced to cram into the container, the pressure of the gases increases. In the smaller container, pressure rises and the volume reduces if temperature remains constant.Is meat a mixture or substance?
Answer:
This type of meat is substance. If you were talking about meters then it would be a system of measurement.
Answer:
Mixture
Explanation:
Meat is composed of approximately 72–75 % water, 21 % nitrogenous compounds (19 % proteins and 1.5 % nonprotein nitrogen compounds which include nucleotides, peptides, creatine, and creatinine), 2.5–5 % lipids, 1 % non-nitrogenous compounds (vitamins) and carbohydrates (a very small amount of glycogen).
PLEASE HELPPPP! :{
Leandra is performing an investigation. She places one strawberry by the window in the sunlight and another strawberry inside of the refrigerator. Leandra leaves the strawberries for three weeks and observes them. After the three weeks, what observation did Leandra make?
A. The strawberry in the refrigerator rusted faster because it was exposed to less heat.
B. The strawberry by the window rusted faster because it was exposed to more heat.
C. The strawberry in the refrigerator rotted faster because it was exposed to less heat.
D. The strawberry by the window rotted faster because it was exposed to more heat.
Unlike particles in a liquid or a gas, the particles in a typical solid are arranged
A. separately from one another in constantly changing positions
B. in close contact with one another and in constantly changing positions
C. randomly in fixed positions
D. in orderly patterns and fixed positions
Answer:
D. In orderly patterns and fized positions
Explanation:
Biologists designed an experiment to test the effect of compost on the development of root crops. They tested several different crops, including carrots, potatoes, beets, and onions. They grew most of the plants in the greenhouse, but due to space issues, they had to grow some outdoors. They gave all the plants the same amount of compost. They obtained the compost from a local farmer and from the local hardware store. They ran out of the farmer’s compost, so some of the plants received that compost when the seeds were planted and other plants got hardware store compost after the plants had already started growing.
RESULTS: Some of the roots seemed really big. Other roots seemed normal or small.
CONCLUSION: They couldn’t tell what the effect of the compost was because the results were inconsistent.
What are five problems with this experimental design that could have caused inconsistent results?
Answer:
it is 56
Explanation:
Answer:
one of the problems are that sum of the plants weren't getting the same kind of compost the second issue is that they couldn't fit all the plants into the greenhouse third issue issue was that some plants got compost when planted but what about the others
I got this answer from one of the WRONG answers. This was in the comments. So thanks to them!
Most earthquakes and volcanoes occur in areas of the Pacific Ocean called "The Ring of Fire." What is the main reason for this?
Group of answer choices
Large numbers of people live in this area.
That area of the Earth is hotter than any other area.
Lithosphere plate boundaries are found in that area.
The weight of the ocean water forces magma to the surface.
Answer:
Lithosphere plate boundaries are found in that area.
Explanation:
Answer:
C is the right answer
Explanation:
carol accidentally dropped a container of salt and sodium chloride, into a container of a dark grey metal. carol is pretty sure that the gray metal is iron fillings. using the table above, help carol seperate the two substances
Explanation:
The best way to separate the mixture is by using a bar magnet. We explore the magnetic property of the iron fillings in the mixture to separate it out.
The mixture is spread out thinly on a flat surface. A bar magnet is hovered above the spread of the mixtureThe magnet attracts the iron fillings to itself This will leave the salt behind in the mixture.List the following particles in size order, from biggest to smallest?
A Molecules, electrons, atoms incorrect answer
B Atoms, molecules, electrons incorrect answer
C Electrons, atoms, molecules incorrect answer
D Molecules, atoms, electrons
Answer:
D. Molecules, atoms, electrons.
Explanation:
I did a quiz on this and got it right
Answer:
D. Molecules, atoms, electrons.
Explanation:
i did the test trust i got it right
is soda homogeneous or heterogeneous?
Answer:
Thecinically it is both because and an un opened bottle of soda is homogeneous and an opened bottle of soda is herterogeneous. I hope this helps please reward branlist.
What type of a solution is 60g NaNO3 at 40°C in
100g H202
Answer:
Explanation:
Saturated solution
I need to find the orbit notation
1. Ne - 1s 2s 2p 3s 3p 4s 3d 4p 5s
Answer:
1s*2 2s*2 2p*6
Explanation:
atomic number of neon is 10 so the s-shell contains 2 electron and p-shell contains 6
Calculate the volume (in cm³) of 935 grams of steel. The density of steel is 7.8 g/cm³. Give your answer to 2 decimal places.
Answer:
119.87 cm³Explanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\[/tex]
From the question we have
[tex]volume = \frac{935}{7.8} \\ = 119.871794...[/tex]
We have the final answer as
119.87 cm³ to two decimal placesHope this helps you
The second atomic structure YES
No
Answer
The second part of the theory says all atoms of a given element are identical in mass and properties. The third part says compounds are combinations of two or more different types of atoms. The fourth part of the theory states that a chemical reaction is a rearrangement of atoms.
Explanation:
Someone knows how to solve this? It was found that 0.0005 mol of Ca (OH) 2 dissolved in 100 cm3 of solution is 80% dissociated. Calculate the pH of this solution.
Answer:
pH = 11.9
Explanation:
First, we determine the number of OH⁻ moles dissolved:
80% of Ca(OH)₂ is dissolved:
0.0005 mol * 80/100 = 4x10⁻⁴ mol Ca(OH)₂There are two OH⁻ moles per Ca(OH)₂ mol:
4x10⁻⁴ * 2 = 8x10⁻⁴ mol OH⁻Now we can calculate the molar concentration of OH⁻ (moles/L):
100 cm³ = 100 mL100 mL ⇒ 100/1000 = 0.1 L[OH⁻] = 8x10⁻⁴ mol / 0.1 L = 8x10⁻³ MThen we calculate the pOH of the solution:
pOH = -log[OH⁻] = -log(8x10⁻³ M) = 2.10Finally, we can calculate the pH of the solution using the equation
pH + pOH = 14pH = 14 - pOH = 14 -2.10pH = 11.92. Leaves turning brown in the fall
Chemical or Physical or Both
What Evidences show that it’s Chemical, Physical, or Both:
The smallest unit of life is a _____, and all organisms have at least one.
Answer:
cell
Explanation:
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Answer:
cell
Explanation:
That is the smallest unit of life, and every living thing has at least one cell, such as unicellular living things.
Please answer it!! Would appreciate it!
[tex] \sf \: Answer \: 8 \: :[/tex]
→ During the formation of a chemical bond, heat is released.
[tex] \sf \: Answer \: 9 \: :[/tex]
→ Solution that contains all the solute it can hold at a given temperature is saturated.
[tex] \sf \: Answer \: 10\: :[/tex]
→ No. of neutrons present in Bromine are 44
PHYSICS.... NOT CHEMISTRY
If the gravitational force between the two objects is 2.0×10 ^-7 N and the value of gravitational constant, G= 6.67×10 ^-11 n m² kg¯², what is the value of D?
F=Gm1m2/D*2
or,2.0×10^-7 = (6.67×10^-11 ×75×90)/D^2
or,2.0×10^-7 = (45022.5×10^-11)/D^2
or,D^2=22511.25×10^-4
D=1.5003m
Balancing Chemical Equations method3- the algebraic method
Answer:
Write a different letter coefficient in front of each compound in the equation. Write algebraic expressions or rules for each element that equate its atoms on the LHS and RHS. Substitute the values into the other rules to obtain the balancing coefficients
Explanation:
_______forces do not affect the movement of an object.
Why does a plant based diet provide fewer resources to produce
Answer: A plant-based diet requires less water to produce the food as it suppress all animal based products. In addition to consuming a lot of water to produce meat , livestock farming also pollutes water source because of the waste produced by the livestock ends up in waterways.
Explanation:
Answer:
I'm doing this so you can give smithpaige347 Brainliest
Explanation:
Based on the given information, which of the following is the students' correct conclusion about their experiment?
Answer:kj
Explanation:nnn
What percent of a human cell is made of macromolecules?
Answer:
About 70 percent. I hope this helps :)
How does more greenhouse gases in the Earth's atmosphere affect earth's temperature?
Explanation:
Greenhouse gasses in Earth's atmosphere affect Earth's temperature by making it hotter. Greenhouse gasses make the Earth warmer by trapping heat. You can think of greenhouse gasses as Earth's blanket.
Answer:
It effects the earth when we have more greenhouse gasses in the earth's atmosphere because it makes the earth more warmer which will cause more sunlight to hit earth because there is more heat near the earth's surface, and this will cause the temperatures to rise really high because of the heat.
Hope this helps!
Which of the following trends decrease down group 1 from Li → Cs?
I. melting point
II. jonization energy
III. atomic radius
A.
I and II only
B.
II and III
C.
II and IIl only
D.
I and III only
Answer:
A. I and II only
Explanation:
As we move down the group atomic radii increased with increase of atomic number. The addition of electron in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased.
As the size of atom increases the ionization energy from top to bottom also decreases because it becomes easier to remove the electron because of less nuclear attraction and as more electrons are added the outer electrons becomes more shielded and away from nucleus.
Melting point also goes to decreases because there is large distance between the positive nucleus and bonded electrons thus overall attraction goes to reduced and less energy is required to melt.
What are the parts of an electron configuration?
Answer:
Explanation:
electronic confirmation=1s^2,2S^2,2P^6,3S^2
atomic no.is 12 therefore :- this is magnesium
Period=3
Block=s-block
Group=II A
What type of waves transmit signals in satellite communication?
A. Microwaves
B. X-rays
C. Gamma Rays
D. Radio Waves
Answer:
satellites communicate by using radio waves to send signals to the antennas on the Earth. the antennas then capture those signals and process the information coming from those signals.
hope this helps:)
Answer:
D
Explanation:
Kind of self explanatory don't you think?