Answer:
Ionization Energy increases from left to right on the periodic table. Atomic radius decreases moving left to right on the periodic table.
Atomic size gradually decreases from left to right across a period of elements. This is because, within a period or family of elements, all electrons are added to the same shell.
an 11.5g sample of ethonal 6.00g of Carbon 1.51g of hydrogen what is the percent composition of each element
C : 52.2%, H : 13.1%, O:34.7%
Further explanationThe empirical formula is the smallest comparison of atoms of compound forming elements.
A molecular formula is a formula that shows the number of atomic elements that make up a compound.
(empirical formula) n = molecular formula
11.5 g of Ethanol-C₂H₅OH contains 6.00 g of Carbon and 1.51 g of Hydrogen.
mass of Oxygen :
[tex]\tt 11.5-(6+1.51)=4~g[/tex]
Percent composition :
C[tex]\tt \dfrac{6}{11.5}\times 100\%=52.2\%[/tex]
H[tex]\tt \dfrac{1.51}{11.5}\times 100\%=13.1\%[/tex]
O[tex]\tt \dfrac{4}{11.5}\times 100\5=34.7\%[/tex]
What volume, in L, of a 6.3 M K2SO4 solution contains 44.1 g of K2SO4?
Choose all the answers that apply.
Which of the following energy forms are involved in a nuclear power plant?
heat
sound
mechanical
electrical
nuclear
Answer:
heat, electrical, mechanical, nuclear,sound
Explanation:
The power plant is mechanicalised so it produce heat which is in form of electrical and then we start hearing sound
Which situation describes a chemical change?
A. Clay pressed into a mold takes on the shape of the mold.
B. Baking soda added to vinegar gives off carbon dioxide gas.
C. Chocolate changes from a solid to a liquid when heated.
D. Rubbing pencil lead onto paper changes the color of the paper.
Answer:
C
Explanation:
I just took the test
Answer:
B
Explanation:
PLEASE CHECK MY ANSWERS AND VERIFY THEM! THANK YOU SO MUCH !!!!!
2. Determine the heat of reaction (AH,xn) for the process by which hydrazine (N2H4)
is formed from its elements:
N2 (g) +
2 H2 (g) →
N2H4 (g)
by using the following thermochemical data:
N H. (g)
+
O2 (g) →
N2 (g)
-
2 H2O(g)
AH - - 622.2 kJ
H2(g) +
1/2 O2 (g)
H2O (g)
AH = - 285.8 kJ
IN
The heat of reaction : 50.6 kJ
Further explanationBased on the principle of Hess's Law, the change in enthalpy of a reaction will be the same even though it is through several stages or ways
Reaction
N₂(g) + 2H₂(g) ⇒N₂H₄(l)
thermochemical data:
1. N₂H₄(l)+O₂(g)⇒N₂(g)+2H₂O(l) ΔH=-622.2 kJ
2. H₂(g)+1/2O₂(g)⇒H₂O(l) ΔH=-285.8 kJ
We arrange the position of the elements / compounds so that they correspond to the main reaction, and the enthalpy sign will also change
1. N₂(g)+H₂O(l) ⇒ N₂H₄(l)+O₂(g) ΔH=+622.2 kJ
2. H₂(g)+1/2O₂(g)⇒H₂O(l) ΔH=-285.8 kJ x 2 ⇒
2H₂(g)+O₂(g)⇒2H₂O(l) ΔH=-571.6 kJ
Add reaction 1 and reaction 2, and remove the same compound from different sides
1. N₂(g)+2H₂O(l) ⇒ N₂H₄(l)+O₂(g) ΔH=+622.2 kJ
2.2H₂(g)+O₂(g)⇒2H₂O(l) ΔH=-571.6 kJ
-------------------------------------------------------------------- +
N₂(g) + 2H₂(g) ⇒N₂H₄(l) ΔH=50.6 kJ
Define oxidation and reduction.Balance the following redox reaction by ` oxidation number method or ion electrons method.` I_(2)+OH^(-)rarr I^(-)+10_(3)^(-)+H_(2)O
Answer:
HNO₃ + H₃AsO₃(aq) → NO(g) + H₃AsO₄(aq) + H₂O(l)
Identify the oxidation number of every atom.
Left hand side: H= +1; N= +5; O = -2; As = +3
Right hand side: N = +2; O = -2; H = +1; As = +5
Determine the change in oxidation number for each atom that changes.
N: +5 → +2; Change = -3
As: +3 → +5; Change = +2
Make the total increase in oxidation number equal to the total decrease in oxidation number.
We need 2 atoms of N for every 3 atoms of As. This gives us total changes of -6 and +6.
Place these numbers as coefficients in front of the formulas containing those atoms.
2HNO₃ + 3H₃AsO₃(aq) → 2NO(g) + 3H₃AsO₄(aq) + H₂O(l)
Balance all remaining atoms other than H and O.
Done.
Balance O.
Done.
Balance H.
Done.
Explanation:
Nose color is an inherited trait in dogs. Two puppies from the same set of parents have different color noses. One puppy has a pink nose and one puppy has a black nose. How can puppies from the same set of parents have different color noses?
A.
The pink-nosed puppy and the black nosed puppy must not actually be related.
B.
The pink-nosed puppy and the black nosed puppy inherited different combinations of the genes for nose color from their parents.
C.
The pink-nosed puppy has a different number of chromosomes than the black nosed puppy.
D.
The pink nosed puppy and the black nosed puppy have different chromosomes for the two nose colors.
Answer:
I thin its B im not sure though
Explanation:
The puppies from the same set of parents have different color noses because the pink-nosed puppy and the black nosed puppy inherited different combinations of the genes for nose color from their parents. Thus, the correct option is B.
What is a gene?A gene is the unit of inheritance which is made up of DNA (deoxyribonucleic acid). Every person receives two copies or alleles of each gene which is inherited from each of the two parent.
Genes are made up of DNA, so each of the chromosome contains many different genes. Genes carry the information which determines the traits or characteristics that are passed on to their offspring or inherited from the parents.
The puppies from the same set of parents have different colored noses because pink-nosed puppy and the black nosed puppy inherited different combinations of the genes for nose color from their parents.
Therefore, the correct option is B.
Learn more about Inheritance here:
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calculate the heat required in joules to convert 18.0 grams of water ice at a temperature of -20 c to liquid water at the normal boiling point of water given specific heat of ice 2.09
Answer:
Explanation:
Heat required to convert ice to ice at 0⁰C
= mass x specific heat x rise in temperature
= 18 x 2.09 x 20
= 752.4 J .
heat required to convert ice at 0⁰C to water at 0⁰C
mass x latent heat of fusion
= 18 x 336
= 6048 J
Heat required to increase the temperature of water to 100⁰C
= 18 x 4.2 x 100
= 7560 J
Total heat required
7560 + 6048 + 752.4
= 14360.4 J
For the chemical reaction 2HBr(aq)+Ba(OH)2(aq)⟶2H2O(l)+BaBr2(aq) write the net ionic equation, including the phases.
Answer:
2H⁺(aq) + 2OH⁻(aq) --> 2H2O(l)
Explanation:
2HBr(aq)+Ba(OH)2(aq)⟶2H2O(l)+BaBr2(aq)
We break the compounds into ions. Only compounds in the aqueous form can be turned into ions.
The ionic equation is given as;
2H⁺(aq) + 2Br⁻(aq) + Ba²⁺(aq) + 2OH⁻(aq) --> 2H2O(l) + Ba²⁺(aq) + 2Br⁻(aq)
Upon eliminating the spectator ions; The net equation is given as;
2H⁺(aq) + 2OH⁻(aq) --> 2H2O(l)
Does the radiation from the sun travel to earth in varying frequencies
Explanation:
The gamma ray photons make their arduous journey to the surface of the Sun, they are continuously absorbed by the solar plasma and re-emitted to lower frequencies. ... By the time they get to the surface, their frequencies are mostly only within the IR/visible light/UV spectrum. Nov28,2020
Spell out the full name of this compound:
There is a diagram of a seven-membered carbon chain, with a –CH3 group attached to the second and fourth carbons.
Answer:
nomenclature of alkanes
Explination:
Substituent Formula Number of C Atoms Name of Substituent
CH3 1 methyl–
CH3CH2 2 ethyl–
CH3CH2CH2 3 propyl–
CH3CH2CH2CH2 4 butyl–
CH3CH2CH2CH2CH2 5 pentyl–
and so forth and so forth and so forth
Try this it helped me allot,
Alkenes and alkynes are named in a similar fashion. The biggest difference is that when identifying the longest carbon chain, it must contain the C–C double or triple bond. Furthermore, when numbering the main chain, the double or triple bond gets the lowest possible number. This means that there may be longer or higher-numbered substituents than would be allowed if the molecule were an alkane. For example, this molecule is 2,4-dimethylhept-3-ene (note the number and the hyphens that indicate the position of the double bond).
2,4-dimethylhept-3-ene
or two one carbonsubstituents on the second and third C atoms
its not 3-methylheptane.
why is skeppdy and badboyhasloes friends
Answer:
what the answer is dream but what
Explanation:
How did you organize the tiles in part A? Describe the method that you used.
Periodic table of numbers tiles
Answer:
I ordered the tiles from left to right and top to bottom as the numbers kept increasing. The tiles were also organized based on the color and shape that they were. The tiles with the same color and shape were arranged in the same column.
Explanation:
In the modern periodic table, the elements are listed in order of increasing atomic number and elements having similar chemical properties naturally line up in the same column (group).
Hydrogen gas “fire quickly in the Hindenburg accident. In comparison, neon gas and helium gas are non-reactive. This is why helium is safe for F aircraft, and neon is safe for electrical signs. Which statement best explains why helium and neon have similar chemical properties?
They both are nonmetals. They both have few protons. They each have only one valance electron. They have the same number of valence electrons.
Answer:
They have the same number of valence electrons.
Explanation:
As a rule of thumb, elements with the same chemical properties must have the same number of valence electrons. This is why elements in the same group have similar chemical properties.
Chemical properties are predicated on the number of valence electrons in an atom. Atoms reacts with other atoms using the number of valence electrons they contain. Helium and neon are in the same group with 8 valence electrons. The valence electrons are the outermost electrons in an atom.Determine the volume (mL) of 15.0 M sulfuric acid needed to react with 45.0 g of
aluminum to produce aluminum sulfate.
Answer:
167 mL.
Explanation:
We'll begin by calculating the number of moles in 45 g of aluminum (Al). This can be obtained as follow:
Mass of Al = 45 g
Molar mass of Al = 27 g/mol
Mole of Al =?
Mole = mass /Molar mass
Mole of Al = 45/27
Mole of Al = 1.67 moles
Next, the balanced equation for the reaction. This is given below:
2Al + 3H2SO4 → Al2(SO4)3 + 3H2
From the balanced equation above,
2 moles of Al reacted with 3 moles of H2SO4.
Next, we shall determine the number of mole of H2SO4 needed to react with 45 g (i.e 1.67 moles) of Al. This can be obtained as:
From the balanced equation above,
2 moles of Al reacted with 3 moles of H2SO4.
Therefore, 1.67 moles of Al will react with = (1.67 × 3)/2 = 2.505 moles of H2SO4.
Thus 2.505 moles of H2SO4 is needed for the reaction.
Next, we shall determine the volume of H2SO4 needed for the reaction. This can be obtained as follow:
Molarity of H2SO4 = 15.0 M
Mole of H2SO4 = 2.505 moles
Volume =?
Molarity = mole /Volume
15 = 2.505 / volume
Cross multiply
15 × volume = 2.505
Divide both side by 15
Volume = 2.505/15
Volume = 0.167 L
Finally, we shall convert 0.167 L to mL. This can be obtained as follow:
1 L = 1000 mL
Therefore,
0.167 L = 0.167 L × 1000 mL / 1 L
0.167 L = 167 mL
Thus, 0.167 L is equivalent to 167 mL.
Therefore, 167 mL H2SO4 is needed for the reaction.
Which of the substances have polar interactions (dipole–dipole forces) between molecules?
A. Cl2
B. F2
C. ClF
D. NF3
Answer:
F2 and Cl2 are non-polar because both contains same atom and they have same electronegativity.
ClF and NF3 have polar interactions because there is electronegativity difference between atoms.
Explanation:
The covalent bond is the chemical bond between atoms where electrons are shared, forming a molecule. Covalent bonds are established between non-metallic elements, such as hydrogen H, oxygen O and chlorine Cl. These elements have many electrons in their outermost level (valence electrons) and have a tendency to gain electrons to acquire the stability of the electronic structure of noble gas. The shared electron pair is common to the two atoms and holds them together.
Electronegativity is defined as the ability of an element to attract the electrons that link it to another element.
The covalent bond between two atoms can be polar or nonpolar.
When two atoms have different electronegativities, the one with the highest electronegativity will attract the electrons towards each other, giving rise to two opposite charges on the bond. That is, this generates that in a polar molecule there is separation between positive and negative charges. The bonds will be all the more polar the greater the difference in electronegativity between the bound atoms.
On the other hand, the non-polar covalent bond occurs between atoms of the same element or between atoms with very little electronegativity difference. It is thus characterized to molecules or bonds that do not exhibit any polarity.
A molecule is a dipole when there is an asymmetric distribution of electrons because the molecule is made up of atoms of different electronegativity. That is, dipole is formed when the molecule is polar.
So, dipole-dipole forces are forces of attraction between polar molecules. These molecules attract when the positive end of one of them is close to the negative of the other.
Given the above, F₂ and Cl₂ are non-polar molecules and ClF and NF₃ are polar molecules. Then ClF and NF₃ have polar interactions (dipole-dipole forces). -Brainly user
Hope this helps!What is the momentum of a cat of mass 4 kg that is running south with a speed of 1.5 m/s?
A. 2.7 kg•m/s south
B. 6.0 kg•m/s south
C. 8.3 kg•m/s south
D. 7.1 kg•m/s south
Answer:
option B is correct
Explanation:
momentum(p)=mv
mass= m=4 kg
velocity=v=1.5 m/s
P=4kg*1.5 m/s=6.0 kg.m/s
so option B is correct
a sample of a gas has a volume kf 640 cm^{3} at 100°c and 1490 mmhg,what would be its volume at stp?
Answer:
V₂ = 918.1 cm³
Explanation:
Given data:
Initial volume = 640 cm³
Initial temperature = 100°C (100+273 = 373 K)
Initial pressure = 1490 mmHg (1490 /760 = 1.96 atm)
Final volume = ?
Final temperature = 273 K
Final pressure = 1 atm
Solution:
Formula:
P₁V₁/T₁ = P₂V₂/T₂
P₁ = Initial pressure
V₁ = Initial volume
T₁ = Initial temperature
P₂ = Final pressure
V₂ = Final volume
T₂ = Final temperature
now we will put the values in formula.
V₂ = P₁V₁ T₂/ T₁ P₂
V₂ = 1.96 atm × 640 cm³ × 273 K / 373 K × 1 atm
V₂ = 342451.2 atm .cm³ . K / 373 K. atm
V₂ = 918.1 cm³
Which of the following correctly identifies and explains the charge on an atom of
sodium?
Answer:
The best and most correct answer among the choices provided by your question is the fourth choice.
The data explains that sodium atoms hardly ever form 2+ ions.
I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!
Explanation:
Ground glass is a/an _______ material.
a) soft
b) opaque
c) translucent
d) transparent
Answer:
Opaque Material
Answer:
A ground glass is translucent as it allows only partial light to pass through it and forms light shadows
There are two cups of water. The cups of water must have the same average Kinetic energy if they have the same ___
Answer:
Temperature and Heat
Explanation:
Proportional to the average kinetic energy of the molecules in a substance.
In order for radiation to transfer heat, A electromagnetic waves must be transmitted
B objects must be in direct physical contact C particles must circulate and move in a liquid or gas D thermal energy must move from cold to hot objects.
Answer : A
Explanation
B- conduction
c - convection
D heat transfer
Answer:
d
Explanation:
How much force is needed to cause a 15 kilogram bicycle to accelerate at a rate of 10 meters per second per second?
Answer:
F = 150 N
Explanation:
Given data:
Mass of bicycle = 15 kg
Acceleration = 10 m/s²
Force needed = ?
Solution:
Formula:
F = ma
F = force
m = mass
a = acceleration
now we will put the values in formula.
F = 15 Kg × 10 m/s²
F = 150 Kg.m/s²
Kg.m/s² = N
F = 150 N
A sample of laughing gas occupies 0.250 L at 14.7 psi and - 80.0°C. If the volume of the gas is 0.375 L at 25.0°C, what is the pressure?
Answer:
Final pressure =P₂ = 15.13 psi
Explanation:
Given data:
Initial volume = 0.250 L
Initial pressure = 14.7 psi
Initial temperature = -80.0°C (-80.0 +273 = 193 K)
Final volume = 0.375 L
Final temperature = 25.0°C (25+273 =298 k)
Final pressure = ?
Solution:
P₁V₁/T₁ = P₂V₂/T₂
P₁ = Initial pressure
V₁ = Initial volume
T₁ = Initial temperature
P₂ = Final pressure
V₂ = Final volume
T₂ = Final temperature
Now we will put the values in formula.
P₂ = P₁V₁ T₂/ T₁ V₂
P₂ = 14.7 psi × 0.250 L × 298 K / 193 K × 0.375 L
P₂ = 1095.15 psi .L. K / 72.375 K.L
P₂ = 15.13 psi
The formation of ammonia is represented by the equation N2(g) + 3H2(g) ⇌ 2NH3(g). Determine the enthalpy of formation of ammonia given the following mean bond enthalpies (kJmol-1): N≡N 942; H-H 436; N-H 386
Answer:
[tex]\Delta _fH_{NH_3}=-66\frac{kJ}{mol}[/tex]
Explanation:
Hello!
In this case, since the study of the bond energy allows us to compute the enthalpies of some reactions, for this combination reaction by which ammonia is yielded, we understand the enthalpy of reaction equals the enthalpy of formation of ammonia, and, in terms of the bonds energy we can write:
[tex]\Delta _fH_{NH_3}=Delta _rH=\Sigma \Delta H(bonds \ broken)-\Sigma \Delta H(bonds \ formed)[/tex]
Whereas the bonds enthalpy of those bonds that get broken cover the N≡N and the three H-H bonds at the reactants side and the enthalpy of those bonds that are formed cover the six N-H bonds at the products; which means we obtain:
[tex]\Delta _fH_{NH_3}=942\frac{kJ}{mol} +3*436\frac{kJ}{mol}-6*386\frac{kJ}{mol}\\\\\Delta _fH_{NH_3}=-66\frac{kJ}{mol}[/tex]
Which differs from the theoretical value that is -46 kJ/mol.
Best regards!
Calculate the standard potential for a cell that employs the over-all cell reaction: 2Al(s) + 3 I2(s)→2 Al+3 + 6 I- From reduction potential table: Al+3 (aq) + 3e- → Al(s) -1.66 V I2(s) + 2e- → 2I- -0.54 V
Answer:
Explanation:
2Al(s) + 3 I₂(s) → 2 Al⁺³ + 6 I⁻
Aluminium is oxidised and iodine is reduced .
so cell potential = Ereduction - Eoxidation
Al⁺³ + 3e = Al - 1.66 V
I₂ + 2 e = 2 I⁻ 0.54 V
= .54 - ( - 1.66 )
= 1.66 + .54
= 2.2 V
The overall standard cell potential for the given cell that employs the overall cell reaction is; E°_cell = 2.20 V
We are given the cell reaction;
2Al (s) + 3I₂ (s) → 2Al⁺³ + 6I⁻
We are given reduction potential as;
Al⁺³(aq) + 3e⁻ → Al(s) ;E°_red = -1.66 V
However, the standard reduction potential for the reverse of the oxidation reaction is;
Al → Al⁺³(aq) + 3e⁻ ;E°_ox = 1.66 V
We are also given;
I₂ + 2e⁻ = 2I⁻ ;E°_red = 0.54 V
To get overall standard cell potential, we will add the cell potentials to get;
E°_cell = E°_ox + E°_red
E°_cell = 1.66 + 0.54
E°_cell = 2.20 V
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What volume of a 0.181 M nitric acid solution is required to neutralize 25.1 mL of a 0.167 M calcium hydroxide solution
Answer:
46.32 mL
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
2HNO₃ + Ca(OH)₂ —> Ca(NO₃)₂ + 2H₂O
From the balanced equation above,
The following data were obtained:
Mole ratio of the acid, HNO₃ (nA) = 2
Mole ratio of the base, Ca(OH)₂ (nB) = 1
Next, we shall write out the data obtained from the question. This includes:
Molarity of the acid, HNO₃ (Ma) = 0.181 M
Volume of the base, Ca(OH)₂ (Vb) = 25.1 mL
Molarity of the base, Ca(OH)₂ (Mb) = 0.167 M
Volume of the acid, HNO₃ (Va) =?
Finally, we shall determine the volume of the acid, HNO₃ as shown below:
MaVa/ MbVb = nA/nB
0.181 × Va / 0.167 × 25.1 = 2/1
0.181 × Va / 4.1917 = 2
Cross multiply
0.181 × Va = 4.1917 × 2
0.181 × Va = 8.3834
Divide both side by 0.181
Va = 8.3834 / 0.181
Va = 46.32 mL
Therefore, the nitric acid, HNO₃ required for the reaction is 46.32 mL
(Question) : What is the specific gravity of liquid sample with a mass
of 35.0 g and a volume of. 14.00 mL ?
Answer:
48.0g is the specific gravity of liquid sample with a mass of 35.0g and a volume of 14.00 mL
what mass of potassium chlorate should be required to produce 113 L of oxygen O2. measured at STP g
Answer:
411.6 g
Explanation:
The equation for the decomposition of potassium chlorate to produce oxygen is given as;
2KClO3 --> 2KCl + 3O2
From the stochiometry of the reaction 2 mole of KClO3 produces 3 mol of O2
At STP,
1 mol = 22.4L
3 mol = x
x = 67.2L
2 mole of KClO3 produces 67.2L of O2
How many moles would produce 113L?
2 = 67.2
x = 113
x = 3.36 moles
Moles can be converted to mass using;
Mass = moles * Molar mass
Mass = 3,36 * 122.5 g/mol
Mass = 411.6 g
