Answer:
The number of molecules in 895 g of H₂O is 4.49*10²⁵.
Explanation:
Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023*10²³ particles per mole. Avogadro's number represents a quantity without an associated physical dimension, so it is considered a pure number that allows describing a physical characteristic without an explicit dimension or unit of expression. Avogadro's number applies to any substance.
In this case, the molar mass of compound H₂O is 18 g / mol. So if 18 grams of H₂O are present in 1 mole, 895 grams will be present in how many moles of H₂O?
[tex]moles of H_{2}O=\frac{895 grams*1 mole }{18 grams}[/tex]
moles of H₂O= 74.58
Then the following rule of three can be applied: if 1 mole of the compound contains 6.023 * 10²³ molecules by definition of Avogadro's number, 74.58 moles of the compound how many molecules will it contain?
[tex]amount of molecules=\frac{74.58 moles*6.023*10^{23}molecules }{1 mole}[/tex]
amount of molecules=4.49*10²⁵
The number of molecules in 895 g of H₂O is 4.49*10²⁵.
Which statement best explains what happens to a leaf when it has lost much-needed water?
Answer:
its turgor pressure decreases
Explanation: This is also important because this function regulates water loss within the plant. Lower turgor pressure can mean that the cell has a low water concentration and closing the stomata would help to preserve water. :-)
When a leaf loses much-needed water, its turgor pressure would decrease. Hence Option A is Correct
What is Turgor pressure ?Turgor Pressure is created in the cells of a leaf when there is enough water. The water stretches the cell membrane outward, creating a kind of pressure.
When the cells lose water, the cell membrane shrinks inward and loses the supporting pressure.
Thus, the turgor pressure created by the presence of water is lost by the absence of water.
The absence of water also affects the rate of photosynthesis and transpiration negatively and not positively. A leaf losing water has no bearing on the atmospheric pressure.
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1. Which is not a characteristic of a compound?
Answer:
Just look at which one it doesn't show.
Explanation:
Characteristics of compounds
1. Components in a compound are present in a definite proportion.
2. It has a homogeneous composition.
3. Particles in a compound are of one kind.
4. A compound is made up of one or more atoms of the same or different elements.
5. In a compound the elements are present in a fixed ratio by mass.
6. A compound can be divided into simpler substances by a chemical process.
7. The physical and chemical properties of a compound are completely different from those of its constituents.
The table below lists some properties of a sample of lauric acid.
Property
Value
Volume
Mass
79.6 mL
70.0229
222°C
Boiling point
Number of
moles
0.350
Which of these is an intensive property of this sample?
Answer:
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Explanation:
Answer: boiling point
Explanation:
Which liquid has the weakest intermolecular forces?
Answer:
Oil- Only London Dispersion Forces (the weakest intermolecular force)
Water- London Dispersion, Dipole-Dipole, and Hydrogen Bonding
Given the balanced equation: 2 C₄H₁₀ + 13 O₂ ➞ 8 CO₂ + 10 H₂O, what is the mole to mole ratio of CO₂ to O₂ ? *
4 points
13/2
8/10
13/8
8/13
Answer:
8/ 13
Explanation:
.................................
the amount of energy required to move an electron
Answer:
quantum of energy
help me its is hard..
Answer:
800 kJ
Explanation:
Answer:
800 kj
Explanation:
the line is at 800
How many grams of NH4ClO4 would dissolve in 250 mL at 30 C
ASAP, NO TROLLS 20 points!!!!
Answer:
1.- Chemical change
2.- Because the atoms in the image are tranformed into a new molecule
3.- Yes, it does
4.- Due to the amount of atoms are the same both in products and reagents
Explanation:
Answer:
1.- Chemical change
2.- Yes it does ,because the atoms in the image are transformed into a new molecule
3.- Yes, it does because energy is not being created or destroyed
4.- Due to the amount of atoms are the same both in products and reagents
please help me solve step by step!!
A motorcycle and its rider have a combined mass of 1250 kg. They travel inside
a vertical loop with a radius of 7.13 m. At the lowest point, the speed is 22.7 m/s. How much force does the track exert on the motorcycle, at this lowest
point, to keep the rider in the loop?
lonic bonds form between metals and
o metalloids O nonmetals o metalloids
What is the electron configuration of a fluoride ion (F-) in the ground state?
1522s22p?
1822s22p4
1522s22p6
1522s22p5
chnge color is a sign of chemical reaction
In 17.2 seconds, a shopping cart is pushed 15.6 meters towards the west. What is the velocity of the cart? (hint~The answer is NOT 3m/s)
Answer:
0.91m/s due west
Explanation:
Given parameters:
Time taken = 17.2s
Displacement = 15.6m
Unknown:
Velocity of the cart = ?
Solution:
Velocity of a body is the the displacement divided by the time taken.
Velocity = [tex]\frac{displacement}{time}[/tex]
Now insert the parameters and solve;
Velocity = [tex]\frac{15.6}{17.2}[/tex] = 0.91m/s due west
Lily took 57 seconds to walk from classroom to library. If the distance between the classroom and library was 38 m, at what average speed did Lily walk in m/min?
___ m/min
fungi have eukaryotic cells (large cells with a nucleus), like animals and plants
True or false?
What do acids have in common?
A. They all produce negative hydroxide ions
B. Their formulas all begin with H
C. Their formulas all end with OH.
D. They all produce negative hydrogen ions
evanrosario11 avatar
evanrosario11
7 minutes ago
Physics
High School
100 Points + Brainlest PLZ HElP
What ion would each of the following elements form?
For example, a sodium atom (Na) will form a sodium ion (Na+1). You will need to list the charge of the ion. You will need to list the charge of the ion for the seven questions below.
1. Beryllium (Be)
2. Sulfur (S)
3. Potassium (K)
4. Aluminum (Al)
5. Bromine (Br)
6. Oxygen (O)
7. Magnesium (Mg)
Answer:
Forming positive ions
Explanation:
A sodium atom has one electron in its outer shell. ... It will still have 11 positive protons but only 10 negative electrons. So, the overall charge is +1. A positive sign is added to the symbol for sodium, Na +.
Hope it helps
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Explanation:
Forming Positive Ions
Hope It Helped U
What is sodium oxide when it’s broken down into its elements?
Answer:
Explanation:Typically, manufactured glass contains around 15% sodium oxide, 70% silica (silicon dioxide) and 9% lime (calcium oxide). The sodium carbonate "soda" serves as a flux to lower the temperature at which the silica mixture melts
What is an example of extensive property
Answer:
Mass & Volume
Explanation:
An Extensive Property is a property that depends on the amount of matter in a sample. Mass and volume are examples of extensive properties. Meanwhile, Color, Temperature, and Solubility are examples of Intensive Properties.
Help fast please What is the definition of homeostasis?
A. Your body out of balance
B. Being sick
C. Your body not needing any regulation
D. Your body systems staying in balance
Answer:
I think its D
Explanation:
Answer:
D
Explanation:
It's B because homeostasis is the ability to maintain a relatively stable internal state that persists despite changes.
Hope this helps!!! If this is incorrect, I'm so sorry! Have a lovely day.
Help!!
The primary function of the chromosome is to—
A. Store the genetic instructions needed to specify traits
B. Release energy by breaking down food molecules
C. Transport waste materials rapidly out of the cell
D. Relay messages between different cells in animals
What is the mass and volume of the nucleus relative to the size of the atom?
Answer:
The atom with the smallest mass is the hydrogen atom; its mass is about 10-27 kg. The masses of other atoms go up to about 200 times this. The nucleus of an atom is about 10-15 m in size; this means it is about 10-5 (or 1/100,000) of the size of the whole atom.
Name three instructions that DNA provides to a cell
Answer:
The instructions in a gene that tell the cell how to make a specific protein. A, C, G, and T are the "letters" of the DNA code; they stand for the chemicals adenine (A), cytosine (C), guanine (G), and thymine (T), respectively, that make up the nucleotide bases of DNA.
hope it helps !
DNA contains the commands that an organism requires to develop, survive, and reproduce. DNA sequences must be transformed into messages that can be used to make proteins, which are the complex molecules that do the majority of the work in our bodies, in order to perform these functions.
What is DNA?Deoxyribonucleic acid is a polymer consisting of two polynucleotide chains that coil into one another to form a double helix.
It contains genetic information in the form, fully operational, growth, and reproduction of all kinds of organisms and viruses. Nucleic acids include DNA and ribonucleic acid.
DNA stores information as a code composed of four chemical bases: adenine (A), guanine (G), cytosine (C), and thymine (T).
DNA contains all of the instructions that an organism needs to develop, survive, and reproduce.
To perform these functions, DNA sequences must be transformed into messages that can be used to make proteins, which are the complex molecules that do the majority of the work in our bodies.
Thus, these are some of the instructions that DNA provides to cell.
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Pl help if your gonna awser for point pl put I don’t know if you give me the awsers I will give you Brainly
Because i just did it
answer c
The cause of the phases of the moon Is a cycle that is close to - long
Answer: 28 days.
Hope this helps...... Stay safe and have a Merry Christmas!!!!!!!!! :D
Which property of matter is conserved in chemical reactions and shown by balanced equations?
A. mass
B. volume
C. density
D. shape
Answer:
Mass is your answer
Explanation:
How many grams of sulfur are in 3.54 g of H2S?
Answer:
3.329 g
Explanation:
First you need to determine the molar mass of H2S which is 34.1 g/mol.
With that we know that to find the moles of H2S we just divide the mass of sample with the molar mass.
3.54 g / 34.1 g/mol = 0.103812317 mol of H2S
This means that there is also 0.103812317 mol of sulfur since there is 1 mole of sulfur per 1 mole of H2S.
The molar mass of sulfur is 32.065 g/mol and to find the mass of sulfur you need to multiply the molar mass with the moles of the compound.
0.103812317 mol * 32.065 g/mol = 3.329 g of sulfur
Let me know if you get something else or if something is unclear in the comments so that we can figure it out.
I need this answer. any thing will help
Answer: condensaytion
Explanation: its reverse vaporation instead of water turning into gas gas turns into water
Fill in the blanks using terms from this unit.
Even though plants are rooted in the ground, they still move, exert
Blank Options
choose your answer...
and do
Blank Options
choose your answer...
.
Plant cells have very strong cell walls that allow
Blank Options
choose your answer...
to build up inside of the cell as water is absorbed. This pressure is called
Blank Options
choose your answer...
.
When turgor pressure is high enough in a cell, the cell walls become
Blank Options
choose your answer...
and As a result, the cell becomes rigid and the plant is able to stand
Blank Options
choose your answer...
and straight. When a plant does not get enough water, the turgor pressure inside of the cells
Blank Options
choose your answer...
.
A decrease in pushing against the cell wall causes the cells to lose their
Blank Options
choose your answer...
and This causes the plant to begin to droop, or
Blank Options
choose your answer...
.
When the wilted plant gets enough water, the cells will become rigid again, and the plant will stand firm and straight once again.
Answer:
Even though plants are rooted in the ground, they still move, exert force, and do work.
Plant cells have very strong cell walls that allow pressure to build up inside of the cell as water is absorbed. This pressure is called turgor.
When turgor pressure is high enough in a cell, the cell walls become firm and as a result, the cell becomes rigid and the plant is able to stand tall and straight.
When a plant does not get enough water, the turgor pressure inside of the cells decreases. A decrease in pressure pushing against the cell wall causes the cells to lose their shape and shrink. This causes the plant to begin to droop or wilt.
When the wilted plant gets enough water, the cells will become rigid again, and the plant will stand firm and straight once again.
Explanation: