Answer:
distillation of a mixture
Explanation:
Answer:
A.) Distillation of mixture.
Explanation:
edge 2021
Five liters of air at -36 c is warmed to 89c. what is the new volume if the pressure remains constant?
Answer:
Explanation:
The altitude is irrelevant, except as needed to define the pressure. In this example all three parameters of the Ideal Gas Laws are changing. We set up the equation to solve for the desired final volume. Start with the Ideal Gas Law:
P
⋅
V
=
(
n
⋅
R
⋅
T
)
where the number of moles of gas and the gas constant do not change.
(
P
V
T
)
1
=
(
P
V
T
)
2
Rearrange for the desired
V
2
, Temperatures must be in ‘K: 298 & 283.
(
P
1
V
1
T
1
)
×
T
2
P
2
=
V
2
V
2
=
P
1
×
V
1
×
T
2
T
1
×
P
2
V
2
=
730
×
855
×
283
298
×
605
=
980
L
“Change” in volume is
980
–
855
=
125
L
What causes mountains to form
A) two oceanic plates spreading at a divergent boundary
B) two oceanic plates colliding at a convergent boundary
C) two continental plates spreading at a divergent boundary
D) two continental plates colliding at a convergent boundary
Answer
The Correct Answer Is D
- In each of the following sets of elements, which
element shows the least ability to gain or lose
electrons?
a. Cs, Rb, Na
b. Ba, Ca, Be
c. F, Cl, Br
d. O, Te, S
Answer:
a. Cs, Rb, Na
Explanation:
Electronegativity is the ability of an element to lose or gain electrons. It is expressed as a number that measures the relative tendency with which atoms of the element attract valence electrons in a chemical bond.
Across the periodic table, electronegativity increases except for the noble gasesIt decreases down the groupGroup 1 elements have the least electronegativityCs, Rb and Na all belongs to this groupThey are called the alkali metalsThey are the most electropositive group on the periodic table.An ionic bond results due to the __________________________ attraction between two oppositely charged ion.
Answer:
Electrostatic
Explanation:
An ionic bond results from the electrostatic attraction between oppositely charged ion.
Usually, metallic ion is positively charge and the non-metallic ion is negatively charged.
The attraction results in the formation of an ionic bond. Ionic bond forms by the transfer of electrons from a metal to a non - metal. The charge separation causes the oppositely charged atoms to be attracted to one another.The mass of 3.02 x 10^22 molecules of water is ___.
Answer:
0.9 g (approximately)
Explanation:
What might happen to a plant if the roots grew away from the pull of Earth's gravity?
Answer:
See the answer below
Explanation:
If the root of a plant grows away from the pull of earth's gravity, it will not produce any effect on the plant provided that other conditions of growth are kept normal.
According to research, the force of the Earth's gravity has no effect on the growth features of plants. Plants that were grown away from the influence of gravity still grew normally in a research conducted in space by NASA in 2010.
This thus means that the upward growth of the stem and the downward growth of the root in a negative and positive response to gravity respectively is dictated by the inherent attributes of plants themselves, and not by the force of the earth's gravity.
What does the theory of continental drift state?
A
All the continents were once one continent that broke up and drifted apart over hundreds of millions of years.
B
The continents have always been separate but may one day drift together to form a single continent.
C
The layout of the continents is the same today as it has always been.
D
New continents are continually being created and destroyed.
what element have 3 PELS?
Answer:
boron aluminum gallium indium
Explanation:
hope this helps you
A. Iodine
B. Gold
C. Magnesium
D. Potassium
Answer:
A, Iodine
Explanation:
It exists, sodiumiodine.
A combination of any elements bonded together
Answer:
are called Compounds
Answer:
Compouds
think of a group
an they are alll combined
also "compounds" com-bind = com-POUNDS
Make's sense now?
The table below shows the number of sub-atomic particles in an atom of boron.
What is the amu of a boron atom?
a. 5
b. 6
c. 10
d. 11
op. c 10 is ur ans
HOPE THIS HELPS!!
Answer:
11 amu=Protons+Nuetrons the actual amu in the period table is 10.8
Explanation:
amu is Protons + nuetrons (5+6) = 11
This can be crossed checked with a periodic table where it has a amu of 10.8 which can be rounded up to 11.
How does the final paragraph relate to the main idea of the article? (4.03) science.
Answer:
Indicates the writer's stance on the main idea of a paragraph. The controlling idea appears in the paragraph's topic sentence. ... The final sentence of a paragraph that summarizes the topic sentence using different words. Words and phrases that show how the ideas in sentences and paragraphs are related.
Explanation:
HOPE THIS HELP
PICK ME AS THE BRAINLIEST
Answer:
he last paragraph relates to the main topic because the main topic is about cells and the last paragraph is saying how scientist are still discovering cells but the author says that the new cells are not listed in the article
Explanation:
i had a bad day i hope you have a good one -me ;
Glycogenolysis and gluconeogenesis occur in the liver due to the action of?
Glycogenolysis and Gluconeogenesis occur in the liver due to the action of Cortisol.
It is the process of storing excess glucose for body which can be used at later time. the glycogen stored by the liver is broken down to glucose and dispersed in the body.
Cortisol helps to decrease insulin and increase glucagon. glucagon is type of peptide hormone secreted by pancreatic cells to increase the process of gycogenolysis or gluconeogenis. it is the primary stress harmone which increases glucose(sugar) in blood.
Gluconeogesis ia that process which tansform non carbohydrate substrate like amino acid ,gycerol into glucose.
Thus, Glycogenolysis and Gluconeogenesis occur in the liver due to the action of Cortisol.
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Please show work!
Question below:
Answer:
The answer is B. 11
Explanation:
I did the math and used what I know to find the answer. B is correct.
3. Will a paper airplane with longer wings fly farther than shorter wings?
Independent variable
Yes, the more air that can get under the wings the longer the airplane will stay airborne increasing the chances it will fly farther.
What is an independent variable ?It is an independent variable that doesn't alter as a result of the other variables you're attempting to assess. An independent variable could be something like a person's age. Other aspects of a person's life, like as what they eat, how much they attend school, or how much television they watch, won't alter their age.
Design of the paper aircraft would be your independent variable, and flight distance would be your dependent variable. Your constants would be things like where you are when you fly the planes, who is flying them, how they launch, the kind of paper used to build them, etc.The plane was tested to see how far it would fly as each paper clip was added. The manipulated variable was the mass of the plane (the quantity of paper clips added). The flying distance was the responding variable. The experiment's controlled variable was the usage of the same plane in each trial.Learn more about Independent variable here:
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Identify the conjugate acid/base pairs present in an aqueous solution of hydrogen sulfate ion, HSO4-.
Explanation:
conjugate acid/base pairs are compounds which differ by the hydrogen ion (H⁺)
The conjugate based is formed when an acid donates a proton.
HSO₄⁻ --> H⁺ + SO₄²⁻
The conjugate base of HSO₄⁻ is SO₄²⁻
The conjugate acid is formed when a base accepts a proton.
HSO₄⁻ + H⁺ --> H₂SO₄
The conjugate acid of HSO₄⁻ is H₂SO₄
How do electrons in the same orbital move?
[xe] 6s2 4f4 is the noble gas configuration for which element
Answer:
Neodymium
Explanation:
The given element is:
[Xe] 6s² 4f⁴
To solve this problem, we need to find the number of electrons in the element given;
Xe has 54 electrons already
6s² 4f⁴ where:
letters are the orbitals
6 and 4 are the energy levels
superscript are the number of electrons
So, 2 + 4 = 6
Total number of electrons = 54 + 6 = 60
The element is Neodymium
[xe] [tex]6s^2[/tex] [tex]4f^4[/tex] is the noble gas configuration for Neodymium. The electron configuration of noble gases follows the general law of electrons filling into atoms' energy levels and orbitals.
The term "noble gas configuration" refers to the periodic table's Group 18 (Group 8A) noble gases' electron configuration. Helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn) are some of these gases. The general rule of filling electrons into atoms' energy levels and orbitals applies to the electron configuration of noble gases. Noble gases are extremely stable and inert because their electron shells are totally filled. The electron configuration of atoms that come after noble gases is frequently expressed using the noble gas configuration as a shortcut notation.
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4.45 kcal of heat was added to increase the temperature of a sample of water from 23.0 °C to 57.8 °C. Calculate
the grams of water. Specific heat of water is 1 cal/g. °C. lkcal = 1000cal
Answer:
m = 4450 g
Explanation:
Given data:
Amount of heat added = 4.45 Kcal ( 4.45 kcal ×1000 cal/ 1kcal = 4450 cal)
Initial temperature = 23.0°C
Final temperature = 57.8°C
Specific heat capacity of water = 1 cal/g.°C
Mass of water in gram = ?
Solution:
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 57.8°C - 23.0°C
ΔT = 34.8°C
4450 cal = m × 1 cal/g.°C × 34.8°C
m = 4450 cal / 1 cal/g
m = 4450 g
Help! What is the the correct number for the product of this particular reaction?
Answer: synthesis, decomposition, single-displacement, double-displacement, combustion and acid-base reactions.
Explanation:
How many liters of a 3 M NaOH stock solution would you need to make 552 mL of a 105 mM NaOH dilution
Answer:
0.01932 L
Explanation:
First we convert 105 mM to M:
105 mM / 1000 = 0.105 MNext we convert 552 mL to L:
552 mL / 1000 = 0.552 LThen we use the following equation:
C₁V₁=C₂V₂Where:
C₁ = 3 MV₁ = ?C₂ = 0.105 MV₂ = 0.552 LWe input the given data:
3 M * V₁ = 0.105 M * 0.552 LAnd solve for V₁:
V₁ = 0.01932 LHow many total molecules will be present when the reaction of 5,000 molecules of CS2 with 15,000 molecules of 0 2 goes to completion?
CS2(1)+3 02(g) CO2(g) + 2S02(g)
(A) 5,000
(B) 10,000
(C) 15,000
(D) 20,000
Answer:
(C) 15,000
Explanation:
The equation is ...
CS₂ +3O₂ ⇒ CO₂ +2SO₂
This indicates 1 molecule of CS₂ combines with 3 molecules of O₂ to produce 1 molecule of CO₂ and 2 molecules of SO₂.
Counting molecules, we see that the original 4 molecules in a 1:3 ratio become 1+2 = 3 molecules. The reactants present are in the necessary 1:3 ratio of CS₂ : O₂, so there are no limitations on the reaction. It can use all of the original molecules to produce ...
(3/4)(20,000) = 15,000
molecules of product.
When the reaction completes, there will be 15,000 molecules present.
What is the distance from and object’s top to its bottom?
The distance from object’s top to its bottom is Height
The distance from object’s side to side is Length
What is the molecular formula of a component whose molar mass is 88.0 and whose percent composted is 9.1
The molecular formula : C₄H₈O₂
Further explanationMaybe a compound is 54.5% carbon, 9.1% hydrogen and 36.4% oxygen,so :
mol C :
[tex]\tt \dfrac{54.5}{12}=4.54[/tex]
mol H :
[tex]\tt \dfrac{9.1}{1}=9.1[/tex]
mol O :
[tex]\tt \dfrac{36.4}{16}=2.28[/tex]
Divide by 2.28(the smallest ratio) :
C H : O =
[tex]\tt \dfrac{4.54}{2.28}\div \dfrac{9.1}{2.28}\div \dfrac{2.28}{2.28}=2\div 4\div 1[/tex]
The empirical formula : C₂H₄O
(The empirical formula)n=molecular formula
(2.12+4.1+16)n=88
(44)n=88⇒n=2
Can anyone help me with my homework
The soil is still radioactively contaminated after the Chernobyl nuclear explosion. so NO, Most of the people who left Chernobyl after the nuclear plant explosion have not returned. NO, The accident at Chernobyl had not occurred during a safety test.. YES, Temperatures inside the reactor during the explosion were as hot as parts of the Sun's atmosphere. YES, The fuel in the reactor included U-238 from enriched uranium dioxide.
YES, A radioactive cloud blew across Northern Europe after the explosion. NO,Isotopes of the same element have not the same number of neutrons. but Isotopes are atoms of the same element that have the same number of protons and electrons but different numbers of neutrons YES, When one mole of U-235 undergoes fission, the energy released can power about 400 average U.S. homes for a year.
YES, Nuclear reactors must have control rods to keep a chain reaction from occurring.
YES, Radioactive strontium can lead to bone cancer.
YES, The radioactive iodine released during the explosion still poses a health threat to people in Northern Europe.
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What is the mass of H2SO4 in a 38.2-cm3 sample of concentrated sulfuric acid that has a density of 1.84 g/cm3 and consists of 98.3% H2SO4
Answer:
69.09 g
Explanation:
First we calculate the mass of the sample of concentrated H₂SO₄, using the given volume and density:
Mass = density * volumeMass = 1.84 g/cm³ * 38.2 cm³ = 70.288 gThere are 70.288 grams of solution, of which 98.3% is H₂SO₄. Thus the H₂SO₄ mass is:
70.288 g * 98.3/100 = 69.09 gTaking into account the definition of density and percentage by mass, the mass of H₂SO₄ in a 38.2 cm³ sample of concentrated sulfuric acid is 69.09 grams.
Definition of densityBut first you must know the definition of density. Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.
In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance. Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
[tex]density=\frac{mass}{volume}[/tex]
Mass of solutionIn this case, you know that:
Density= 1.84 [tex]\frac{g}{cm^{3} }[/tex]
Volume= 38.2 cm³
Replacing in the definition of density:
[tex]1.84 \frac{g}{cm^{3} }=\frac{mass}{38.2 cm^{3} }[/tex]
Solving:
mass= 1.84 [tex]\frac{g}{cm^{3} }[/tex]×38.2 cm³
mass= 70.288 g
So, the mass of the solution is 70.288 grams.
Definition of percentage by massThe percentage by mass expresses the concentration and indicates the amount of mass of solute present in 100 grams of solution.
In other words, the percentage by mass of a component of the solution is defined as the ratio of the mass of the solute to the mass of the solution, expressed as a percentage.
The percentage by mass is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage. This is:
[tex]percentage by mass=\frac{mass of solute}{mass of solution}x100[/tex]
Mass of H₂SO₄In this case, you know:
percentage by mass=98.3%
mass of solute= ?
mass of solution= 70.288 grams
Replacing in the definition of percentage by mass:
[tex]98.3=\frac{mass of solute}{70.288 grams}x100[/tex]
Solving:
[tex]\frac{98.3}{100} =\frac{mass of solute}{70.288 grams}[/tex]
[tex]0.983=\frac{mass of solute}{70.288 grams}[/tex]
0.983× 70.288 grams= mass of solute
69.09 grams= mass of solute
The mass of H₂SO₄ in a 38.2 cm³ sample of concentrated sulfuric acid is 69.09 grams.
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density:
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percentage by mass:
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A container at STP contains 64.0O grams of oxygen. How many liters of O2(g) are in the container?
Answer:
44.80
Explanation:
How much heat is required to take a 150 g sample of water from 10.0 ℃ to 95.0 ℃? cs,water = 4.184 J/g*℃
Answer:
[tex]\boxed {\boxed {\sf 53, 346 \ Joules}}[/tex]
Explanation:
We are given the specific heat and change in temperature, so we should use this heat formula:
[tex]q=m C \Delta T[/tex]
where m is the mass, C is the specific heat capacity, and ΔT is the change in temperature.
We know the mass is 150 grams. The specific heat of water is 4.184 J/g °C.
Let's find the change in temperature.
Subtract the initial temperature from the final temperature.
ΔT= final temp - initial tempfinal= 95.0 °C and initial= 10.0 °CΔT= 95.0 °C - 10.0 °C= 85.0 °CNow we know all the values:
[tex]m= 150 \ g \\C= 4.184 J/ g \ \textdegree C \\\Delta T= 85.0 \textdegree C[/tex]
Substitute them into the formula.
[tex]q=(150 \ g) (4.184 \ J/g \ \textdegree C)(85.0 \textdegree C )[/tex]
Multiply all three numbers together. Note that the grams (g) and degrees Celsius (°C) will cancel out. Joules (J) will be the only remaining unit.
[tex]q=(627.6 \ J/ \textdegree C) ( 85.0 \textdegree C)[/tex]
[tex]q=53346 \ J[/tex]
53,346 Joules of heat are required.
Given BH3, O3, CO2, and NH3, which of these compound is an exception to the octet rules?
a. BH3
b. O3
c. NH3
d. CO2
Answer:
a. BH₃
Explanation:
According to the octet rules, atoms reach stability when are surrounded by eight electrons in their valence shell when they combine to form a chemical compound.
From the options, the only compound in which the central atom does not meet the octet rules is BH₃. The central atom is boron (B), which has 3 electrons in its valence shell. When B is combined with hydrogen (H), 3 electrons from the 3 atoms of H are added. The total amount of electrons is 6, fewer than 8 electrons needed to meet the rule.
The compound which is showing exception to the octet rules is BH₃.
What is octet rule?According to the octet rule in the outermost valence shell of any compound, eight electrons should present.
Among the given compounds only BH₃ will not satisfy the octet rule, as in the outermost shell of boron atom 3 electron are present following the electronic configuration 1s²,2s²2p¹ because its atomic number is 5. Now this boron atom will form bond with 3 hydrogen atoms and these hydrogen atoms will share 3 electrons to boron atom.
So, total electrons in the outer most shell of BH₃ compound is 3+3=6.
Hence, BH₃ is an exception of octet rule.
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does anyone know how to do this???
Answer:
2.9 g/cm³
Explanation:
From the question given above, the following data were obtained:
Mass = 236.376 g
Volume = 81.5 cm³
Density =?
Density can be defined as the mass of a substance per unit volume of the substance. It can be expressed mathematically as:
Density = mass /volume
With the above formula, we can obtain the density of the object as shown below:
Mass = 236.376 g
Volume = 81.5 cm³
Density =?
Density = mass /volume
Density = 236.376 / 81.5
Density = 2.9 g/cm³
Thus, the density of the object is 2.9 g/cm³