Answer:
D
Explanation:
Scientists always perform tests and observe and measure in the physical world to prove their points or answer their questions.
formation of magnesium chloride
-Pure magnesium is commonly made by separating it from seawater. This process is known as electrolysis. The liquid magnesium formed is cooled into convenient blocks of metal known as ingots. The chlorine gas is recycled to form hydrochloric acid for the production of more magnesium chloride.
What does the period number tell about the energy levels occupied by electrons in an atom?
Answer:
Number of energy levels that the element has.
Explanation:
The period number (n) is the outer energy level that is occupied by electrons. The period number that an element is in, is the number of energy levels that the element has.
a. 24.5 g of ammonia NH3 = how many moles of ammonia?
.b How many molecules of ammonia is that from 22.a.?
what is electrolysis
Answer:
electrolysis is a technique that uses a direct electric current to drive an otherwise non-spontaneous chemical reaction
Explanation:
Rapid, uncontrolled cell division of abnormal cells is characteristic of
sex cells
cancer
growth
sexual reproduction
Question 11
A solution cannot dissolve any more solute even though only a small amount of solute has
been added to the solvent. This solution is
1. saturated and concentrated
2. unsaturated and dilute
3. saturated and dilute
4. unsaturated and concentrated
Answer:
Explanation:
B.) Saturated
A saturated solution is when the maximum amount of solute that could be dissolved in that solvent volume at that temperature and pressure has been dissolved, adding more solute beyond this point would lead to the additional solute not dissolving in the solvent. When the maximum solute concentration in the solution that can be dissolved has been reached the solution is said to be saturated.
Hope This Helps??
What is the similarity between 0.6 M KI and 0.6 m KI ?
Answer:
Molarity and molality are both used to express the concentration of a solution. The amount of solute is both expressed in moles.
Explanation:
What is the half-life of a radioisotope if a 50-g sample becomes 25 g after 18
days?
O A. 25 days
O B. 9 days
O C. 50 days
O D. 18 days
Answer:
18 DAYS IS THE HALF LIFE OF THE RADIOISOTOPE.
Explanation:
Using the formula
Nt = No * (1/2)^t/t1/2
where;
Nt = amount remaining = 25 g
No = Initial amounrt of the radioisotope = 50 g
t = time elapsed = 18 days
t1/2 = half life = unknown
Substitute the values into the equation and obtain the half life of the radioisotope;
Nt = No * (1/2) ^t/t1/2
25 = 50 * (1/2) ^18/t1/2
25 /50 = (1/2)^18/ t1/2
1/2 = (1/2)^18/t1/2
1/2)^1 = (1/2)^18/t1/2
1 = 18/t1/2
t1/2 = 18 days.
So therefore the half life of the radioisotope is 18 days.
Answer:
18 days
Explanation:
Did it on A pex
nvironmental Science
a.
Identify the biotic factor of an ecosystem from the following:
soil composition
b. trees
temperature
d. sunlight
C.
Answer:
c
Explanation:
Soil, Plants get energy from the sun.. Answer is C.
Answer:
B. trees
Explanation:
A biotic factor is something in an environment or ecosystem that is living. For example, plants and animals are biotic factors. An abiotic factor is just the opposite-they are not living. Rocks and water are examples of abiotic factors.
Soil composition, temperature and sunlight are all not alive. Therefore, they must be abiotic factors.
Trees are living organism. This means that they are biotic factors. So, the correct answer is B: trees.
Why does the weight of the dry ice go down while it’s sitting on the scale
Dry ice is colder, heavier, less messy than regular ice. If I understood your question correctly, the mass of it would decrease bc it is being dispersed into the air as carbon dioxide.
Explanation:
As a result of the transformation of solid carbon dioxide into carbon dioxide gas, which enters the atmosphere, the weight of the ice decreases and falls.
What is Melting?Melting, also known as fusion, is a physical process that causes a substance's phase transition from solid to liquid. This happens when the internal energy of a solid increases, typically through the application of heat or pressure, which raises the temperature of the substance to the melting point. Melting is the transformation of a solid into a liquid caused by the application of heat. In a pure crystalline solid, this process occurs at a fixed temperature known as the melting point; an impure solid usually melts over a range of temperatures below the melting point of the principal component.The melting point of a solid is the temperature at which melting occurs. In this process, heat is released from the solid.To learn more about Melting refer to:
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The atomicity of bromine is
Answer:
So, the atomicity of noble gases is 1. Example. ... So, the atomicity of hydrogen, nitrogen, oxygen, chlorine, bromine and iodine is 2 each.
Explanation:
So, the atomicity of noble gases is 1. Example. ... So, the atomicity of hydrogen, nitrogen, oxygen, chlorine, bromine and iodine is 2 each.
could help
12. Aditya is stacking some cups. The diagram above shows the cups before they touch each other. Use the information in the diagram to answer the question.
After the cups have been touching for a while, which of the two bottom cups will be cooler, and why?
Answer:
please give more clarification
How many moles are there in 500cm3 of a 0.5mol/dm³ solution of sulfuric acid?
Answer:
0.25moles
Explanation:
There are 1000[tex]cm^{3}[/tex] for 1[tex]dm^{3}[/tex]
Therefore in 1000[tex]cm^{3}[/tex] of 0.5 mol/[tex]dm^{3}[/tex] solution has = 0.5 moles
Therefore 500[tex]cm^{3}[/tex] contains = 0.5/1000 x 500 = 0.25moles
The number of moles of sulfuric acid in 0.5 mol/dm³ solution is equal to 0.25 mol.
What is the molarity?The concentration of the solution can be determined as the number of moles of a solute in per unit volume of a solution is known as molarity or molar concentration.
The Molarity of the solution is calculated in the following formula:
Molarity (M) = Moles (n)/Volume of the Solution (in L)
Now if we have to find the number of moles of solute in the solution, the formula becomes:
Number of moles of solute (n) = Molarity (M) × Volume of the Solution
Given, the concentration of the sulfuric acid solution = 0.5 mol/dm³
The volume of the solution, V = 500 cm³
As we know, 1 dm³ = 10³ cm³, the volume of solution = 0.5 dm³
The number of moles of the sulfuric acid = M × V
= 0.5 × 0.5 = 0.25 mol
Therefore, 0.25 moles of sulfuric acid in 500cm3 of a 0.5mol/dm³ solution of sulfuric acid.
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Why would it be more comfortable to walk on hot beach sand in flip-flops
than without them?
O A. Thermal insulation is blocked by the flip-flops.
B. Convection warming is blocked by the flip-flops.
C. Radiation warming is blocked by the flip-flops.
O D. Thermal conduction is blocked by the flip-flops.
Answer:
D. Thermal conduction is blocked by the flip-flops.
Explanation:
Convection is a process of heat transfer which involves fluids( liquid or gas). This however rules convection out of the answer.
Radiation involves heat transfer from the sun to bodies on earth.
Conduction involves heat transfer between two solid bodies. Hot beach sand and flip-flops are solid bodies which validates thermal(heat) conduction.
Of the reactions listed below, which one is NOT a combination reaction? A) C + O2 => CO2 B) 2Mg + O2 => 2MgO C) 2N2 + 3H => 2NH3 D) CaO + H2O => Ca(OH)2 E) 2CH4 + 4O2 => 2CO2 + 4H2O
Answer:
E
Explanation:
A combination reaction is one in which two elements or two compounds react to give a new single compound
Hence, what we are expecting on the reactant side is only a single product and not a mixture of products
For the first reaction, we had two elements giving a single product
For the second reaction, we had same
For the third, we had same
For the fourth, we had two compounds reacting to give a singe new product
While in the last, we had two different products which means it does not follow the definition of a combination reaction and that makes it our answer
Only purple flowers result from a cross between purple-flowered pea plants and white-flowered pea plants. What does this indicate?
Purple flowers are a mutation
Purple flowers are recessive
Purple flowers are dominant
Purple flowers are hybrid
Answer:
Purple flowers are dominant
Explanation:
describes the forces that exist
between a liquid and different
molecules,
A Adhesion
B. Repulsion
C. Condensation
D. Cohesion
98-2000 Anths Charpentine A Nights Arsenal
Answer:
i just answered this and its a
Explanation:
Consider the equations below.
H₂ → 2H
CHA+HC2H5
C2H5 + HC2H6
When these equations are added together, what will the overall equation be?
C₂H4+H₂C₂H
H2 + CH4 + 2H + C2H5+ → 2H + CH3 + CHE
C2H4 +C2H4 + H2>C2H5 + C2H5
Answer:
a
Explanation:
The overall equation is [tex]C_2H_4 + H_2 ---- > C_2H_6[/tex].
What is Chemical Equation?A chemical equation is defined as a symbolic representation of a chemical reaction in the form of symbols and formulas, in which reactant elements are given on the left and product units on the right.
For example,
[tex]NaOH+ HCl ---- > NaCl+ H_2O[/tex]
In this, reactants are converted to products which is symbolized by a chemical equation. For example, iron (Fe) and sulfur (S) combine to form iron sulfide (FeS).
Fe(s) + S(s) → FeS(s)
here, the plus sign indicates that iron reacts with sulfur.
Thus, the overall equation is [tex]C_2H_4 + H_2 ---- > C_2H_6[/tex].
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Please help!! This is for chem!!!
Answer:
1st answer choice
P4O6 + 2 O2 -> P4O10
Explanation:
You need to cancel out reactants and products that are the same.
P4 cancels out because it appears in both reactants and products
We get 2 O2 in the reactants because 5-3= 2
Thus, answer choice 1 is correct.
The name given to the substance formed when a liquid is miscible in another liquid.
Answer:
Solute
Explanation:
Given the formula representing a compound: What is the IUPAC name of this compound?
Answer:
2,2- dichloro-heptane
Explanation:
The IUPAC name of the compound is 2,2-dichloro-heptane
WILL GIVE BRAINLIEST FOR CORRECT ANSWERS W/ EXPLANATION
PLEASE HELP...
Ethyl acetate is a sweet-smelling solvent used in varnishes and fingernail polish remover. It is produced industrially by heating acetic acid and ethanol
together in the presence of sulfuric acid, which is added to speed up the
reaction. The ethyl acetate is distilled off as it is formed. The equation for the
process is as follows.
CH3COOH + CH3CH2OH --> CH3COOCH2CH3 + H2O
Determine the percentage yield in the following cases:
a. 68.3 g of ethyl acetate should be produced but only 43.9 g is recovered.
b. 0.0419 mol of ethyl acetate is produced but 0.0722 mol is expected. (Hint:
Percentage yield can also be calculated by dividing the actual yield in moles
by the theoretical yield in moles.)
c. 4.29 mol of ethanol is reacted with excess acetic acid, but only 2.98 mol of
ethyl acetate is produced.
d. A mixture of 0.58 mol ethanol and 0.82 mol acetic acid is reacted and 0.46
mol ethyl acetate is produced. (Hint: What is the limiting reactant?)
Answer:
The percentage yields are as follows :
a) 64.28%
b) 58.03%
c) 69.46%
d) 79.31%
Explanation:
The percentage yield is the ratio of the actual yield of a product to the expected or theoretical yield expressed as a percentage.
Percent yield = actual yield/theoretical yield x 100%
a) from the question, expected yield is 68.3 g whilst the actual yield is 43.9 g
therefore,
Percentage yield = 43.9 g/68.3 g x 100%
= 0.64275 x 100%
= 64.28%
b) From the question, expected yield is 0.0722 mol while the actual yield is 0.0419 mol. Therefore
Percentage yield = 0.0419 /0.0722 x 100%
= 0.58033 x 100%
= 58.03%
c) A limiting reactant is the reactant is is completely used in a recation to form a product. That is, it is the reactant that is not in excess.
From the equation of the reaction :
CH3COOH + CH3CH2OH --> CH3COOCH2CH3 + H2O
1 mole of ethanol reacts with 1 mole of acetic acid to give 1 mole of ethyl acetate.
From the question, ethanol is the limiting reactant because it is not in excess. Hence,
4.29 mole of ethanol should produce 4.29 mole of ethyl acetate (expected yield).
However only 2.98 mol of ethyl acetate is produced (actual yield)
Percentage yield = 2.98mol/4.29 mol x 100%
= 0.69463 x 100%
= 69.46%
d) From the question, acetic acid is in excess hence ethanol is the limiting reactant
therefore from the equation of the reaction:
1 mole of ethanol reacts with 1 mole of acetic acid to give 1 mole of ethyl acetate.
0,58 mol of ethanol should produce 0.58 mol of ethyl acetate (expected yield)
But 0.46 mol of ethyl acetae was produced (actual yield)
Percentage yield = 0.46mol /0.58 mol x 100%
= 0.79310 x 100%
= 79.31%
I NEED HELP PLEASE, THANKS SO MUCH! :)
Solids, liquids and gases are the three most commonly accepted phases of matter. Explain the properties of each phase, including their relative energy.
Gases, liquids and solids are all made up of atoms, molecules, and/or ions, but the way the particles inside them differ.
In a gas, the molecules are spread wide apart and moves freely at high speeds
In a liquid, the more closer to each other and will vibrate or slip past each other
In a solid, the molecules are tightly packed, making no room for each other and harder to move. These molecules vibrate and jiggle but, don't move
Which statement accurately describes the movement of Earth’s plates due to convection currents?
Answer:
Volcanic eruptions.
Can someone help me with my chemistry homework?!
Answer:
calculate grams and use mole ratio lol
Explanation:
Answer:
Explanation:
23
evidence of a chemical change includes?
Answer:
Change of color, change in temperature, change of energy or loss heat, odor etc....
the force that keeps the nucleons bound inside the nucleus of an atom
Answer:
Strong Nuclear Force
Explanation:
Strong Nuclear Force; is the force that keeps the nucleons bound inside the nucleus of an atom. It is a short range attractive force that acts between all nucleons in the nucleus of the atom that is much stronger than electrical forces.
Answer:
nuclear force
Explanation:
Am I correct? Because I’m kinda in between answers
Answer:
yh you are correct. the pattern is correct! :)
Answer:
Yep! :)
Explanation:
When 0.3 moles of acetylene is burned , total mole number of the products will be? a- 0.30 mol b-0.60 mol c-0.75 mol d-0.90 mol e- 1.2 mol
Answer:
d. 0.9 mol
Explanation:
On this case we have to start with the formula of acetylene:
[tex]C_2H_2[/tex]
Now we can write the chemical reaction of combustion:
[tex]C_2H_2~+~O_2~->~CO_2~+~H_2O[/tex]
The next step is to balance the reaction:
[tex]2C_2H_2~+~5O_2~->~4CO_2~+~2H_2O[/tex]
The molar ratio between [tex]C_2H_2[/tex] and [tex]CO_2[/tex] is 2:4, so:
[tex]0.3~mol~C_2_H_2\frac{4~mol~CO_2}{2~mol~C_2H_2}=0.6~mol~CO_2[/tex]
The molar ratio between [tex]C_2H_2[/tex] and [tex]H_2O[/tex] is 2:2, so:
[tex]0.3~mol~C_2_H_2\frac{2~mol~H_2O}{2~mol~C_2H_2}=0.3~mol~H_2O[/tex]
The total moles would 0.6 + 0.3=0.9 moles.
I hope it helps!
What takes place in a cell's mitochondria ?
A.cellular respiration
B.DNA replication
C.protein synthesis
D.photosynthesis
I NEED HELP ASAP!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
c
Explanation:
the mitochodria is the protien power house of the cell
