Answer:
0.4g/ml
Explanation:
density= mass/volume
density=50g/125ml
density=0.4g/ml
0.45 g of hydrated sodium carbonate crystals were heated until 3.87 of anhydrous power remained.
How many moles of water are there in one mole of hydrated salt?
Formula of hydrated sodium carbonate : Na₂CO₃.10H₂O, so moles of water in one mole of hydrated salt = 10
Further explanationHydrate is a compound that binds water (H₂O), usually in the form of crystals/ solids
If these compounds are dissolved in water or heated, the hydrates can decompose:
Example: X.YH₂O (s) → X (aq) + YH₂O (l)
The formula for the hydrated compound contains: YH2O
The mole ratio shows the ratio of the coefficients of the hydrate compound
10.45 hydrated sodium carbonate(Na₂CO₃.xH₂O) were heated until 3.87 of 3.87of anhydrous (Na₂CO₃) remained, so
mass H₂O released :
[tex]\tt 10.45-3.87=6.58~g[/tex]
mass Na₂CO₃ = 3.87 g
mol ratio Na₂CO₃(MW= g/mol) : H₂O(MW=18 g/mol) =
[tex]\tt \dfrac{3.87}{105,9888}\div \dfrac{6.58}{18}=0.0365\div 0.3655=1\div 10[/tex]
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.
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
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
How many moles are in a sample of 9.47 x 1024 atoms of argon (Ar)? (Show your calculations for full credit. Correct answers will only receive partial credit.)
Your answer:
Answer:
15.73 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{9.47 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 15.730897...[/tex]
We have the final answer as
15.73 molesHope this helps you
Answer:
15.7 moles of Ar
Explanation:
Given data:
Number of atoms = 9.47 ×10²⁴ atoms
Number of moles of Ar = ?
Solution:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
9.47 ×10²⁴ atoms × 1 mole / 6.022 × 10²³ atoms
1.57×10¹ mol
15.7 mol
fungi have eukaryotic cells (large cells with a nucleus), like animals and plants
True or false?
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
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:
Double bonds are formed when atoms share four electrons. true or false
Answer:
That's is true maybe I'm not sure check your book
1. How did you model mutations in this project?
Answer:
Sorry hun i dont know but if u post a pic i might be able to help...Pls mark most brainliest by pressing the crown Hope u get an A have a nice day
Explanation:
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
help me its is hard..
Answer:
800 kJ
Explanation:
Answer:
800 kj
Explanation:
the line is at 800
The larger the wavelength the shorter the frequency.
True or false
Answer:
True
Explanation:
Answer:
false
Explanation:A high energy light will have a shorter wavelength than a low energy light. If the wavelength goes down, then the frequency goes up. When calculating energy in the equation, E=hv, frequency
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
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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:
Justify the placement of element II (Chlorine), on the periodic table, within its group and period.
Substances that can be drawn into wires without breaking are
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.
What determines the traits of offspring?A.Food sources that have been genetically engineered B.Literary metaphors and exciting connotations C.The pool of entries in the state lotto jackpot D.Genes received from the offspring's parents
Answer:
D. Genes received from the offsprings parents.
Explanation:
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:
.................................
an atom has 11 protons, 12 neutrons, and 11 electrons. what is the charge of the atoms nucleus?
A) +11
B) -11
C) 0
D) 23
Answer:
Since sodium has 11 protons, the number of neutrons must be 23 – 11 = 12 neutrons.
Explanation:
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
Which phrase best describes a machine?
-any device that makes work easier
-any device that moves an object
-any device that has multiple parts
-any device that uses energy
The Statement that best describing a machine is "any device that makes work more easier" Hence Option (A) is correct.
What is a Machine ?A machine is generated by the intellect of Humans to make work more efficient and easier.
It is an invention which multiplies the effect of efforts of Human being in any task.
The machine produces a mechanical efficiency as well.
Therefore, The Statement that best describing a machine is "any device that makes work more easier" Hence Option (A) is correct.
Learn more about machine here ;https://brainly.com/question/3135614
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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
xoxo
Explanation:
Forming Positive Ions
Hope It Helped U
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.
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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lonic bonds form between metals and
o metalloids O nonmetals o metalloids
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 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
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
The velocity of an object in motion at a specific instant point in time is known as __________.
average velocity.
instantaneous velocity.