Answer:
Boiling points
Liquid to gas
Explanation:
For distillation, the differences in boiling points of the liquids in the column is utilized for this separation.
The change in matter involved a state change of liquid to vapor or gaseous form.
Distillation is used to separate different liquids in a mixture. A liquid - liquid mixture is separated into components due to their appreciable boiling point differences. The method is used for purifying liquids. The solution is boiled in a distillation flask to vaporization.How many liters of air must react with 2500 mL of hexane in order for combustion to occur completely. The percentage of oxygen in air is 20.9%.
Answer:
118750 ml
Explanation:
The chemical equation for complete combustion of hexane is given as;
2C6H14 + 19O2 → 12CO2 + 14H2O
From the equation of the reaction;
2 mol of C6H14 reacts with 19 mol of O2
2 ml of C6H14 reacts with 19 ml of O2
2500 mL of C6H14 would react with x ml of O2
2 = 19
2500 = x
x = 2500 * 19 / 2 = 23750 ml
Since oxygen is 20% of air;
23750 = 20 / 100 * (Volume of air)
Volume of air = 23750 * 100 / 20 = 118750 ml
.A student sets up a controlled experiment to test whether aluminum bats hit baseballs further than wooden bats. After measuring the distance travelled by hundreds of struck baseballs, by both high school and professional players, he concludes that wooden bats hit baseballs further because professional players use wooden bats and hit the ball much further than high school players who use aluminum bats.
Where is the flaw in his approach?
The flaw in his approach or his flaw is that he used professional players and high school players this makes the experiment uncontrolled because the players are at two levels of strength.
What was the experiment done by a student to test aluminum bats hit baseballs further than wooden bats?A student sets up a controlled experiment to test whether aluminum bats hit baseballs further than wooden bats. After measuring the distance travelled by hundreds of struck baseballs, by both high school and professional players.
He concludes that wooden bats hit baseballs further because professional players use wooden bats and hit the ball much further than high school players who use aluminum bats. If aluminum bats were permitted for use in baseball then a lot of teams would begin to use them instead. This would reduce the demand for wooden bats and lead to their prices falling.
Therefore, The flaw in his approach or his flaw is that he used professional players and high school players this makes the experiment uncontrolled because the players are at two levels of strength.
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Which equation should be used to calculate the heat change when a given molar amount of H2O is heated from 15oC to 95oC
Answer:
q = m x Cp x ΔT
Explanation:
In the range of temperatures from 15°C to 95°C, water is in the liquid phase. So, the heating process is within the liquid phase and does not involve a change of phase. Therefore, the equation used to calculate the heat absorbed (q) is:
q = m x Cp x ΔT
Where m is the mass of water, Cp is the specific heat of water and ΔT is the change of temperature (in this case: 95°C - 15°C = 80°C).
2Na + Cl2 → 2NaCl
How many moles of Cl2 do you need to use in order to react with 34.485 g of Na?
moles (put 1 zero in front of the decimal)
[tex]\displaystyle 0.75 \ mol \ Cl_2[/tex]
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Stoichiometry
Reading a Periodic TableUsing Dimensional AnalysisExplanation:Step 1: Define
[RxN] 2Na + Cl₂ → 2NaCl
[Given] 34.485 g Na
Step 2: Identify Conversions
[RxN] 2 mol Na = 1 mol Cl₂
Molar Mass of Na - 22.99 g/mol
Step 3: Stoichiometry
Set up: [tex]\displaystyle 34.485 \ g \ Na(\frac{1 \ mol \ Na}{22.99 \ g \ Na})(\frac{1 \ mol \ Cl_2}{2 \ mol \ Na})[/tex]Multiply/Divide: [tex]\displaystyle 0.75 \ mol \ Cl_2[/tex]Step 4: Check
Follow sig fig rules and round. We are given 5 sig figs.
Since our final answer has 2 sig figs, there is no need to round.
How many moles do we have if we have 7.02 x 1024 molecules of
methane, or CH,, which is used to heat homes?
Answer:
10 moles of methane
Explanation:
1 mole of methane contains 6.02 × 10^23 molecules (Avogadro's number)
x moles should contain 7.02 x 1024 molecules of
methane
So,
x= 7.02 x 1024 × 1/6.02 × 10^23
x= 10 moles of methane
Find the empirical formula of a compound containing 32.0 g of bromine and 4.9 g of magnesium.
Answer:
Br2Mg
Explanation:
Empirical formula is the simplest whole number ration of elements in a compound. Molecular formula is n times the empirical formula, where n is integers 1,2,... The empirical formula of the compound is MgBr[tex]_2[/tex].
What is Empirical formula?Empirical formula gives the proportion of the element that is present in a compound. It does not give information about the actual number or the arrangements of the atoms.
The relation between empirical formula and molecular formula can be given as
n= molecular formula÷ empirical formula
where n= 1,2,.....
Number of gram atoms in compound and divide by smallest Number of gram atoms in compound
mole = given mass/molar mass
32.0g×1 mole/79.9g = 0.401 mole Br
4.9g × 1mole/24.31= 0.20 mole Mg
The mole ratio between Br and Mg is 2:1
The empirical formula of the compound is MgBr[tex]_2[/tex].
Therefore, the empirical formula of the compound is MgBr[tex]_2[/tex].
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1. Phosphoric acid reacts with sodium hydroxide according to the equation:
H3PO4 + 3NaOH --> Na3PO4 + 3H2O
ns
If 1.75mol H3PO4 is made to react with 5.00mol NaOH, identify the limiting reactant
Answer:
NaOH
Explanation:
The limiting reactant is the reactant in short supply in an experiment.
We have been given:
Number of moles of H₃PO₄ = 1.75mle
Now from the balanced reaction equation:
1 mole of H₃PO₄ will require 3 moles of NaOH to react with
1.75 mole of H₃PO₄ will then require 1.75 x 3 = 5.25mole of NaOH
But the given amount of NaOH is 5mole, so NaOH is the limiting reactant.
Phosphoric acid reacts with sodium hydroxide. If 1.75mol H[tex]_3[/tex]PO[tex]_4[/tex] is made to react with 5.00mol NaOH, NaOH is the limiting reactant.
Reagents that are entirely consumed by a chemical reaction are known as limiting reagents. They are additionally known as limiting reactants or limiting agents. A predetermined quantity of reactants are necessary for the reaction to be completed, based to the stoichiometry of chemical reactions. The limiting reagent is the one that is completely consumed during a reaction.
Number of moles of H[tex]_3[/tex]PO[tex]_4[/tex] = 1.75mle
1 mole of H[tex]_3[/tex]PO[tex]_4[/tex] require 3 moles of NaOH
1.75 mole of H[tex]_3[/tex]PO[tex]_4[/tex] require 1.75 x 3 = 5.25mole of NaOH
NaOH = 5mole, so NaOH is the limiting reactant.
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PLEASE HELP DUE NOW
how many valance electrons do all of the elements under carbon have?
What is the mass in grams of 1.95 moles of water
Answer:
35.1 grams H2O
Explanation:
Using the molar mass of water (18.016 g/mol):
1.95 mol H2O * (18.016 g H2O / 1 mol H2O) = 35.1312 g H2O --> 35.1 g H2O (with sig figs)
what is the electron configuration of Zn+
A. [Ar] 3d10
B. [Ar] 4s2 3d10
C. [Ar] 4s2 3d9
D. [Ar] 4s1 3d10
Answer:
A.
Explanation:
Its [Ar] 3d¹⁰4s²
Name the salts formed:
1. Magnesium + Nitric Acid
2. Calciuni + Hydrochloric acid
3. Zinc + Sulfuric acid
4. Iron + Sulfuric acid
5. Copper + Nitric Acid
Answer:
1)magnesium nitrate +hydrogen
2)calcium chlorine+hydrogen
3)zinc sulfate +hydrogen
Explanation:
hope it helps
answer this question fast please!
Answer:
A is a physical change, no atoms are being lost its still in it original form
B is a chemical change, it is losing atoms and changing into a new substance
Explanation:
Which group/family contains elements with the smallest radius within the same period?
Answer:
Halogens
Explanation:
From the given choices, the halogens will have the smallest radius within the same period.
The size of an atom is estimated by the atomic radius. This is taken as half of the inter-nuclear distance between two covalently bonded atoms of non-metallic elements or half of the distance between two nuclei in the solid state.
Across a period in the periodic table, atomic radii decrease progressively from left to right. Down a group from top to bottom, atomic radii increase progressively due to the addition of successive shells.Since halogen is the right most group from the choices given, it will have the smallest radius.
In Rutherford's golf foil experiment, no α-particles stuck to the atom. If α-particles had stuck to the atom, what might you have deduced about the atom's structure?
Answer:
See explanation
Explanation:
Rutherford concluded that most of the atom was empty space because of the large number of alpha particles that passed through the gold foil without being deviated.
The deflected particles must have hit the positive core of the atom where most of its mass was concentrated.
From our idea of electricity, positive and negative charges attract each other. If the atom was largely filled with electrons, then the positively charged alpha particle will stick to the electrons due to Coulumbic attraction. This would have been Rutherford's conclusion if the alpha particles had stuck to the atom.
what can be deduced about the atom's structure if α-particles had stuck to the atom is :
The atom is filled with electrons which are negatively chargedThe alpha particles passed through the gold foil used in Rutherford's experiment without been deviated and Rutherford deduced that most of the atoms were empty while some particle were deviated most passed through freely.
If the alpha particles stick to the atom we can deduce that the atom is filled with electrons which are negatively charged particles and this is because in magnetism and electricity unlike poles and unlike charges attract each other while like charges repel one another.
Hence we can conclude that The atom is filled electrons which are negatively charged.
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is palladium a metal nonmetal or metalloid
Answer: metal i believe
Explanation:
Answer:
It is a rare and lustrous silvery-white metal
Explanation:
What is the name of this molecule?
Do all solids have thermal energy? Why?
Answer:
Yes because all solids have some thermal energy, its atoms do vibrate. However, this movement is very small and very rapid, and cannot be observed under ordinary conditions. When heat is added a solid can become a liquid.
Explanation:
Have A Wonderful Day !!
in the image shown above which type of heat transfer is represented by the number 3?
A-conduction
B-convection
C-latent heat
D-radiation
Answer:
Radiation
Explanation:
Radiation is energy that comes from a source and travels through space or heat energy through the air
I hope this helps u..
Everything in group 2 on the periodic table are called
Answer:
group two elements are called alkaline earth metals
Explanation:
Because their oxides form in the earth and are water soluble
BONUS: SHOW D.A. SETUP AND CORRECT ANSWER FOR +2 POINTS
A Troy High School senior has a goal of getting accepted at 10 colleges. Her counselor explained that with the excellent grade she received in AP chemistry she would probably be accepted to one school out of every three to which she applied. She immediately realized that for each application she would have to write 3 essays, and each essay would require 2 hours work. Of course writing essays is no simple matter. For each hour of serious essay writing, she would need to expend 500 calories that she could gain from eating her mother's apple pies. Each apple pie contains 1000 calories. How many pies would she have to eat in order to gain acceptance to 10 colleges?
Answer:27
Explanation:
Took the test
Answer:
30 slices of pie
Explanation:
10 colleges = 30 essays
30 essays= 60 hours of work
60 hours = ( 500*60)
30,000 calories expended = 30 slices of pie
I wouldn't recommend eating that much pie.
what happens when: sulphuric acid reacts with zinc.
Answer:
hope it helps.
Explanation:
Zinc metal dissolves slowly in dilute sulphuric acid to form solutions containing the aquated Zn(II) ion together with hydrogen gas, H2.
The following is NOT an example of a behavior:
Buying a lottery ticket
Jumping rope
Doing a 60 second plank
Making the decision to buy a lottery ticket
Answer:
making the decision to buy a lottery ticket
Explanation:
all the others are q result of a thought........whereas the last one is actually one of the thoughts
Which of the following will have a larger radius than zinc ? Gallium (Ga) Magnesium (Mg) Aluminum (Al) Strontium (St)
Answer:
Strontium (St)
Explanation:
The atom that will have a larger radius than zinc is strontium, Sr.
Atomic radius is defined as the half of the inter-nuclear distance between two covalently bonded atoms of non-metallic elements or half of the distance between two nuclei in the solid state of metals.
Across the period atomic radii decreases progressively due to the increase in nuclear charge. Down a group atomic radii increase progressively due to the successive shells of electrons being added. Since strontium satisfies the criteria, it has the larger atomic radius.Considering the definition of atomic radius, the atom that will have a larger radius than zinc is strontium, Sr.
The atomic radius represents the distance between the nucleus and the valence shell, which is the outermost shell. By means of the atomic radius it is possible to determine the size of the atom.
But the size of the atom or atomic radius is not an easy parameter to determine, since the electrons are not located in defined orbits, at fixed distances from the nucleus, but rather move chaotically in areas of space where the probability of finding the electron is greater than 90%.
Therefore, the atomic radius is considered as half the distance that separates two neighboring nuclei.
By increasing the atomic number of the elements in a group, that is, by going down in a group, the number of occupied levels is increased. Consequently, the atomic radius increases.
On the other hand, the atomic radius decreases as you advance through a period. This is due to the fact that when advancing in a period, while the number of electron shells remains the same, the positive charge of the nucleus increases due to the increase in the atomic number, that is, the number of protons, which have a positive charge. This causes the electrons to move closer to the nucleus, thus decreasing the radius.
In summary, in the groups, the atomic radius increases with the atomic number, that is to say downwards, while in the periods it decreases with increasing Z, towards the right.
Since strontium satisfies the criteria explained previously, it has the largest atomic radius.
Finally, the atom that will have a larger radius than zinc is strontium, Sr.
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https://brainly.com/question/4302027?referrer=searchResultshttps://brainly.com/question/11371316?referrer=searchResultscan someone answer this question on electrolysis please
37 POINTS for the BRAINLIEST
Answer:
There are two electrodes in an electrolysis solution: the positive and the negative electrode. The reaction that happens at each electrode is different. ... Positively charged ions (metals and hydrogen), are attracted to the negative electrode (the cathode), where they receive electrons (a process known as oxidation).
Explanation:
A half equation is used to represent the reaction that happens at an electrode during electrolysis . It shows what happens when ions gain or lose electrons .
hope this helps ^^
How many atoms of Na would be in 2.53 moles of Na?
Answer:
15.24 × 10²³ atoms
Explanation:
Given data:
Number of atoms of Na = ?
Number of moles of Na = 2.53 mol
Solution:
1 mole contain 6.022× 10²³ atoms.
2.53 mol × 6.022× 10²³ atoms / 1mol
15.24 × 10²³ atoms
The number 6.022 × 10²³ is called 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.
How many moles of water are needed in order to produce 218 g of calcium
hydroxide?
Cacz + 2H2O -------> CH2 + Ca(OH)2
0.59 moles
111 moles
30 moles
0.15 moles
Answer:
-------> CH2 + Ca(OH)2
0.59 moles
111 moles
30 moles
0.15 moles
What are the coefficients that would balance the chemical equation below?
Mg + H3PO4 -> Mg3(PO4)2 + H2
O 3, 2, 1,3
O 3, 2, 2, 3
O 1, 1, 1, 1
O 6, 4, 2, 6
The coefficients : 3, 2, 1,3
Further explanationGiven
Reaction
Mg + H3PO4 -> Mg3(PO4)2 + H2
Required
The coefficients
Solution
Steps to balance reactions:
1. Give a coefficient(The most complex compound is assigned a coefficient of 1)
aMg + bH₃PO₄ ⇒ Mg₃(PO₄)₂ + cH₂
2. Make an equation
Mg, left = a, right = 3 ⇒a=3
P, left = b, right = 2⇒b=2
H, left = 3b, right = 2c⇒3b=2c⇒3.2=2c⇒2c=6⇒c=3
The equation becomes :
3Mg + 2H₃PO₄ ⇒ Mg₃(PO₄)₂ + 3H₂
Choose the answer that best completes the passage.
The formation of scientific theories is generally guided by the law of ________, which states that the answer requiring the fewest number of assumptions is more likely to be correct.
a. parsimony
b. ideal gases
c. conservation of mass
d. equivalent exchange
a) parsimony/thriftiness
Choose the correct missing coefficient to balance the following equation:
___H2 + O2 ---> 2H2O *
1
2
3
4
Answer:
2
Explanation:
because it helps to balance the equation
Answer:
2
Explanation:
We want to balance the equation. On the right, there are 4 hydrogens, and 2 oxygens. We should have the same amount on the left.
For hydrogens, we want 4. 2 *2 =4,
Therefore, the answer is 2
I hope this helps! :)
A sample of water contains 5.24 x 1022 molecules. How many moles are in this sample?
Answer:
0.087 moles of water
Explanation:
Given data:
Number of molecules of water = 5.24×10²² molecules
Number of moles of water = ?
Solution:
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 molecules of water
5.24×10²² molecules × 1 mol / 6.022 × 10²³ molecules
0.87×10⁻¹ mol
0.087 mol