Answer:
H-F bonds are the strongest.
As Fluorine is the most electronegative element.
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
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
i’ll give brainliest to whoever is right
Using your knowledge of geologic processes, explain why there are fertile, nutrient-rich soils on and surrounding volcanoes.
Answer:
Explanation:
Soil is made up of different components such as the organic matter, mineral content, air and water.
We find nutrient rich soil near volcanoes due to the geological processes involve.
A volcano is a landform which is made up of upwelling lava reaching the surface. The lava is made up of molten rocks. As they reach the surface, they cool and solidify. The agents of denudation, weathering, erosion, transportation and deposition breaks down the solidified rocks. They are then spread out round the area of the volcano.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
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.
.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).
As the elements in Period 2 are considered in order from lithium to fluorine, there is an
increase in the
A)
atomic radius
B)
electronegativity
C)number of electron shells
D)
number of electrons in the first shell
Answer:
B: electronegativity
Explanation:
Electronegativity is the measure of how strongly atoms attract bonding electrons to themselves.
A is incorrect because Atomic radius though decreases as you go from lithium to fluorine of the periodic table. Atomic radius increases when you go from either top to bottom of the periodic table, or if you go from right to left. So answer A is inaccurate.
C is incorrect because in period 2, all the elements have two electron subshells. For example, Al has 13 electrons. So it has two electron subshells. This is since the first subshell has only two valence electrons and while the second subshell in Al has 11 valence electrons. Therefore, it is inaccurate to say this answer.
D is incorrect because in the first shell, you can only have a max of two electrons. The first shell neither decreases or increases. Therefore, D is inaccurate too.
B is correct because as you go from the periodic table from left to right, the electronegativity and ionization energy increases. This is since the more valence electrons an element has, the more electronegative is. Fluorine for example is desperately trying to get one more electron to have a total of 8 electrons. It wants to have a full shell. Therefore, B is the most relevant answer.
As the chemical elements in Period 2 are considered in order from lithium to fluorine, there is an increase in: B) electronegativity.
On a periodic table, the horizontal columns represents the periods of chemical elements in ascending order such as from lithium (Li) to fluorine (F).
Electronegativity can be defined as a measure of the ability (tendency) of an atom of a chemical element to attract any shared pair of electrons.
Generally, the electronegativity of a chemical element typically increases across the period from left to right.
For example, electronegativity increases from lithium (Li) to fluorine (F) in Period 2 on a periodic table.
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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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How many moles of FeCI3 are present in 345.0 g FeCI3
Answer:
[tex]\boxed {\boxed {\sf About \ 2.127 \ moles \ of \ FeCl_3}}[/tex]
Explanation:
To convert from moles to grams, the molar mass must be used.
1. Find Molar Mass
The compound is iron (III) chloride: FeCl₃
First, find the molar masses of the individual elements in the compound: iron (Fe) and chlorine (Cl).
Fe: 55.84 g/molCl: 35.45 g/molThere are 3 atoms of chlorine, denoted by the subscript after Cl. Multiply the molar mass of chlorine by 3 and add iron's molar mass.
FeCl₃: 3(35.45 g/mol)+(55.84 g/mol)=162.19 g/molThis number tells us the grams of FeCl₃ in 1 mole.
2. Calculate Moles
Use the number as a ratio.
[tex]\frac{162.19 \ g \ FeCl_3}{1 \ mol \ FeCl_3}[/tex]
Multiply by the given number of grams, 345.0.
[tex]345.0 \ g \ FeCl_3 *\frac{162.19 \ g \ FeCl_3}{1 \ mol \ FeCl_3}[/tex]
Flip the fraction so the grams of FeCl₃ will cancel.
[tex]345.0 \ g \ FeCl_3 *\frac{1 \ mol \ FeCl_3}{162.19 \ g \ FeCl_3}[/tex]
[tex]345.0 *\frac{1 \ mol \ FeCl_3}{162.19 }[/tex]
[tex]\frac{345.0 \ mol \ FeCl_3}{162.19 }[/tex]
Divide.
[tex]2.12713484 \ mol \ FeCl_3[/tex]
3. Round
The original measurement of grams, 345.0, has 4 significant figures. We must round our answer to 4 sig figs.
For the answer we calculated, that is the thousandth place.
The 1 in the ten thousandth place tells us to leave the 7 in the thousandth place.
[tex]\approx 2.127 \ mol \ FeCl_3[/tex]
There are about 2.127 moles of iron (III) chloride in 345.0 grams.
Explain how a piece of granite becomes a piece of gneiss?
sorry if this is the wrong subject, couldn't find geology.
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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Which of these travels fastest in vacuum?
A. sound
B. water
C. air
D. light
thanks xx
Answer:
d, light waves!
Explanation:
H2SO4 + 2NaNO2 → 2HNO2 + Na2SO4
How many grams of NaNO2 do you need in order to make 24.14714 g of Na2SO4?
g (use 5 sig figs)
23.459 g NaNO₂
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] H₂SO₄ + 2NaNO₂ → 2HNO₂ + Na₂SO₄
[Given] 24.14714 g Na₂SO₄
Step 2: Identify Conversions
[RxN] 1 mol Na₂SO₄ = 2 mol NaNO₂
Molar Mass of Na - 22.99 g/mol
Molar Mass of N - 14.01 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of S - 32.07 g/mol
Molar Mass of Na₂SO₄ - 2(22.99) + 32.07 + 4(16.00) = 142.05 g/mol
Molar Mass of NaNO₂ - 22.99 + 14.01 + 2(16.00) = 69.00 g/mol
Step 3: Stoichiometry
Set up: [tex]\displaystyle 24.14714 \ g \ Na_2SO_4(\frac{1 \ mol \ Na_2SO_4}{142.05 \ g \ Na_2SO_4})(\frac{2 \ mol \ NaNO_2}{1 \ mol \ Na_2SO_4})(\frac{69.00 \ g \ NaNO_2}{1 \ mol \ NaNO_2})[/tex]Multiply/Divide: [tex]\displaystyle 23.4587 \ g \ NaNO_2[/tex]Step 4: Check
Follow sig fig rules and round. We need 5 sig figs (instructed).
23.4587 g NaNO₂ ≈ 23.459 g NaNO₂
Answer:
23.458
Explanation:
I just did the quiz
Fill in the blank. Elements in group 17 of the periodic table get more reactive as you go ___ the group.
Answer:
down the group
Explanation:
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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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:
1. Calculate the mass (in grams) of 6.15 moles of the following:
a) P4010
b) AgC2H302
c) Fe(CN)
a. 2683.168 g
b. 2683.168 g
c. 663.468 g
Further explanationGiven
Compounds
Required
The mass
Solution
Mass = mol x MW
a) P4010 (MW=283.9 g mol−1)
mass = 6.15 x 283.9 g mol−1
mass = 1745.985 g
b) AgC2H302 (MW=436.2875 g/mol)
mass = 6.15 x 436.2875 g/mol
mass = 2683.168 g
c) Fe(CN)2 (MW=107.881 g/mol)
mass = 6.15 x 107.881 g/mol
mass = 663.468 g
HELP PLEASE!!! time limited
Answer:Photon
Explanation: hope it helped
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 !!
At least how many elements are needed to create a compound
Answer:
Two
Explanation:
Answer:
two or more than two elements.
What happens to the potential energy of a book that is dropped from a desk to the floor?
A.
It gains mass.
B.
It stays the same.
C. It increases as the book falls.
D.
It is converted into kinetic energy.
Answer:
D. It is converted into kinetic energy.
Explanation:
When a book is dropped from a desk to the floor, the potential energy of the book is converted to kinetic energy as it falls.
Potential energy of a body is the energy due to the position of the body. At a particular height, the potential energy is maximum. A body with mass and moving with velocity will have kinetic energyAs the book drops through the height, to conserve energy, the potential energy is converted to kinetic energy.Using the phase diagram for CO2, what phase is carbon dioxide in at -70°C
and 1 atm pressure?
A. It is in the liquid phase.
B. It is in the solid phase.
C. It is at its melting point.
D. It is in the gas phase.
its a gas phase because... it is
To solve this we must be knowing each and every concept related to phase diagram. Therefore, the correct option is option D that is it is in the gas phase.
What is phase diagram?A phase diagram is a graph that displays a substance's thermodynamic properties at various pressures and temperatures. The areas around the lines depict the substance's phase, while the lines depict the points in which the phases are in balance.
Where planes of equilibrium converge, triple points appear. The situation in which 3 components of matter may coexist is known as a triple point. Using the phase diagram for carbon dioxide, gas phase of carbon dioxide is present at -70°C. The correct option is option D.
Therefore, the correct option is option D that is it is in the gas phase.
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Scientists discovered that earths core has two parts by studying?
Answer:
its not actually proven its just a hypothesis because they can't dig that deep because of the pressure
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
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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thank yall for helping with my chemistry question unless you answered the my chemistry question DO NOT ANSWER
Answer:
I think I did but if not you can report me
Explanation:
Answer:
you're welcome! :)
Explanation:
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.