Answer:
C) The positive and negative charges are equal.
Explanation:
Ions can be made by single element or covalently bonded group of elements. The covalently bonded group of elements is called polyatomic ions or polyatomic atoms. The correct option are option C.
What is Ions?Any species that contain charge whether it is positive charge or negative charge is called ions. The example of polyatomic ions are sulfate, phosphate, nitrate etc.
Cation is the species that loose electron and attain positive charge while anion is a species which gain electron and attains negative charge so when anion and cation combine in fixed ration the the overall charge of the molecule is zero that is molecule is neutral, the charge over cation and anion is also called oxidation state.
Before there is a transfer of charges between objects, they are uncharged as the positive and negative charges are equal.
Therefore the correct option are option C.
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Which overall chemical equation is obtained by combining these intermediate equations? Upper C upper H subscript 4 plus 2 upper O subscript 2 (g) right arrow upper C upper O subscript 2 (g) plus 2 upper H subscript 2 upper O (l). Upper C upper H subscript 4 plus 2 upper O subscript 2 (g) right arrow upper C upper O subscript 2 (g) plus 2 upper H subscript 2 upper O (g). Upper C upper H subscript 4 plus 2 upper O subscript 2 (g) right arrow upper C upper O subscript 2 (g) plus 4 upper H subscript 2 upper O (g) plus 2 upper H subscript 2 upper O (l). Upper C upper H subscript 4 plus 2 upper O subscript 2 (g) right arrow upper C upper O subscript 2 (g) plus 6 upper H subscript 2 upper O (g).
The overall chemical equation obtained by combining the intermediate equations is: CH4 + 2O2 → CO2 + 2H2O
BALANCING CHEMICAL EQUATION:According to this question, methane gas reacts with oxygen in a combustion reaction to produce carbon dioxide and water as products.
The chemical equation for the reaction is as follows:
CH4 + O2 → CO2 + H2O
However, the equation is balanced i.e. the number of atoms of each element on both sides of the equation is not the same. We balance the equation using coefficients placed in front of the compound/element as follows:
CH4 + 2O2 → CO2 + 2H2O
Therefore, in words, the correct statement for the balanced equation is: Upper C upper H subscript 4 plus 2 upper O subscript 2 (g) right arrow upper C upper O subscript 2 (g) plus 2 upper H subscript 2 upper O (l).
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Answer:
A on EDGE 2022
Explanation:
A 0.175 M solution of an enantiomerically pure chiral compound D has an observed rotation of +0.27° in a 1-dm sample
container. The molar mass of the compound is 133.0g/mol.
What is the specific rotation of D?
Answer:
The specific rotation of D is 11.60° mL/g dm
Explanation:
Given that:
The path length (l) = 1 dm
Observed rotation (∝) = + 0.27°
Molarity = 0.175 M
Molar mass = 133.0 g/mol
Concentration in (g/mL) = 0.175 mol/L × 133.0 g/mol
Concentration in (g/mL) = 23.275 g/L
Since 1 L = 1000 mL
Concentration in (g/mL) = 0.023275 g/mL
The specific rotation [∝] = ∝/(1×c)
= 0.27°/( 1 dm × 0.023275 g/mL )
= 11.60° mL/g dm
Thus, the specific rotation of D is 11.60° mL/g dm
What element in period 4 has the lowest ionization energy? noble gas, alkali metal, halogen or alkaline earth metal?
Answer:
alkali metal
Explanation:
The alkali metals in period 4 will have the lowest ionization energy of the elements in the period.
Across a period ionization energy increases progressively from left to right due to decreasing atomic radii caused by the increasing nuclear charge which is not compensated for by successive electronic shells.
Ionization energy is the energy needed to remove the most loosely bound electrons of an atom in the gas phase in the ground state. The measure of the readiness of an atom to lose an electron is the ionization energy.Down a group, it decreases.
The periodic table is the arrangement of the elements based on the atomic numbers. The elements of the alkali period have the lowest ionization energy.
What is ionization energy?Ionization energy or the potential is the amount of the potential needed by the molecule or the atom to remove the electron from their shells. The alkali metal elements have the lowest ionization energy.
The ionization potential of the elements increases from the left towards the right of the period due to the decrease in the atomic radii and decreases from top to bottom in a group.
In the period from left to right the atomic radius of the atoms decreases due to the increase in the nuclear charge of the atoms.
Therefore, option B. alkali metal has the lowest ionization energy.
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only number 3 please
Explanation:
1. total electrons = 22
thus element = titanium2. total electrons = 31
thus element = Galium3. total electrons = 37
thus element = Rubidiumhope it helps:)
Answer:
1.Argon
2. Scandium
3. Cobalt
Geckos and some other animals can climb smooth surfaces. Which of these explanations of this
observation do you think is most reasonable?
The gecko's feet are rough, which increases the friction with the surface.
The gecko's feet have tiny suction cups on them that stick to the surface
The gecko's feet secrete a sticky substance that helps them adhere to the surface
The gecko's feet contain molecules that are attracted to the molecules on the surface.
Answer:
The gecko's feet have tiny suction cups on them that stick to the surface.
Answer:
c) pillars
Explanation:
The number of moles of a substance can be converted into
molecules by:
a Dividing them by Avogadro's number
b Multiplying them by their molar mass
C Dividing them by their molar mass
d Multiplying them by Avogadro's number
Answer:
The correct answer is D. Multiplying them by Avogadro's number :)
The number of moles of a substance can be converted into molecules by multiplying them by Avogadro's number. Therefore, option (d) is correct.
What is Avogadro's number?The Avogadro constant is the proportionality factor that is the number of constituent entities such as molecules, atoms, or ions in one mole of a sample and is commonly denoted [tex]N_A[/tex].
Avogadro's number is a constant with a value of 6.022 × 10²³ reciprocal moles. The numeric value of the Avogadro number is in reciprocal moles, a dimensionless number. The value of the Avogadro constant, is the mass of one mole of a compound (in grams).
The number of moles of a given compound can be calculated as:
Moles = Number of molecules/ Avogadro number
Number of molecules = Moles ×Avogadro number
Therefore, the moles can be converted into molecules by multiplying them by Avogadro's number with the number of moles.
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How does wavelength affect the pitch of a sound?
a. the shorter the wavelength, the lower the pitch
b. the longer the wavelength, the lower the pitch
c. the taller the wavelength, the lower the pitch
d. none of these
Answer:
D
Explanation:
because the higher the wavelength the shorter the pitch and the shorter the wavelength the higher the pitch
If you are given the wavelength and speed of a wave, the formula you use to calculate the frequency is
Answer:
Frequency x Wavelength = Speed of wave
Explanation:
So, if you take the Speed and divide it by wavelength then you get the frequency.
Urgent!! SOMEONE PLEASE HELP THANK YOU!
A gas occupies a volume of 555 mL at 0 °C and 8 0.0 kPa. What is the final celsius temperature when the volume of the gas is changed to 1880 mL and the pressure is changed to 39 kPa?
Answer:
The final temperature is 181.92°C
Explanation:
Given
Initial Temperature, T1 = 0°C
Initial Volume, V1 = 555mL
Initial Pressure, P1 = 80.0kPa
Final Volume, V2 = 1880ml
Final Pressure, P2 = 39kPa
Required
Determine the Final Temperature, T1
This question illustrates ideal gas law and will be solved using:
(P1 * V1)/T1 = (P2 * V2)/T2
But first, we need to convert temperature to degree Kelvin
T1 = 0°C = 273 + 0 = 273k
Next, we substitute values for P1, V1, T1, P2 and V2
THE EQUATION BEFOMES
(80 * 550)/273 = (1880 * 39)/T2
44000/273 = 73320/T2
Cross Multiply
44000 * T2 = 73320 * 273
44000T2 = 20016360
Solve for T2
T2 = 20016360/44000
T2 = 454.92K
Convert to degree Celsius
T2 = 454.92 - 273
T2 = 181.92°C
Hence, the final temperature is 181.92°C
The ideal gas law, also called the general gas equation, is the equation of the state of a hypothetical ideal gas.
The ideal gas law work under the constant:-
PressureTemperatureVolumeHence the formula we gonna use is as follows:-
[tex]PV = nRT[/tex]
In the question, the pressure, temperature, and volume are given in two different system
Hence it is equal to
[tex]\frac{PV}{T} = \frac{PV}{T}[/tex]
Put the value given,
[tex]\frac{80*50}{273} = \frac{1880*39}{T}[/tex]
Solving the equation, the value T will be:-
[tex]T2 = \frac{20016360}{44000}[/tex]
=181.92C
The temperature given is 181.92C
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Which element has a greater electronegativity?
fluorine (9) or radium (88)
Answer:
Fluorine
Explanation:
Electronegativity increases as you go from left to right across the periodic table and decreases as you go from top to bottom of the periodic table.
Fluorine is in period 3, group 17
Radium is in period 7, group 2
Radium is in period 7 and we know that electronegativity decreases as you move from top to bottom.
Explanation: As you move from top to bottom, you are in higher energy level, which means that your distance from the nucleus is further away.
Answer:
Fluorine
General Formulas and Concepts:
Chemistry
Reading a Periodic TablePeriodic TrendsElectronegativity - the tendency for an element to attract an electron to itselfZ-effective and Coulomb's Law, Forces of AttractionExplanation:
The Periodic Trend for Electronegativity is up and to the right of the Periodic Table.
Fluorine is Element 9 and has 9 protons. Radium is Element 88 and has 88 protons. Therefore, Radium has a bigger Zeff than Flourine.
However, since Radium is in Period 7 while Fluorine is in Period 2, Radium has more core e⁻ than Fluorine does. This will create a much larger shielding effect, causing Radium's outermost e⁻ to have less FOA between them. Fluorine, since it has less core e⁻, the FOA between the nucleus and outershell e⁻ will be much stronger.
Therefore, Fluorine would attract an electron more than Radium, thus bringing us to the conclusion that Fluorine has a higher electronegativity.
Calculate the amount and mass of starting substances ‚If 10 grams of salt were obtained by their interaction. The reaction equation has the following form: Zn+2HCl -> ZnCl(2)+H(2)
mass Zn : 4.77 g
mass HCl : 5.32 g
Further explanationThe reaction equation is the chemical formula of reagents and product substances
A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.
Reaction
[tex]\tt Zn+2HCl\rightarrow ZnCl_2+H_2[/tex]
MW ZnCl₂=136,286 g/mol
[tex]\tt mol=\dfrac{10}{136.286}=0.073[/tex]
mol Zn : mol ZnCl₂ = 0.073
mass Zn :
[tex]\tt 0.073\times 65,38=4.77~g[/tex]
mol ZnCl₂ : mol HCl = 1 : 2
mol HCl :
[tex]\tt 0.073\times 2=0.146[/tex]
mas HCl :
[tex]\tt 0.146\times 36,46=5.32~g[/tex]
It requires two sticks of butter to make a batch of 20 cookies. How much butter will it take to make 150 cookies?
Answer:
It would take 15 sticks of butter
Explanation:
2 divided by 20 is 0.1
0.1 is how much butter for 1 so now we multiply that by 150
0.1 x 150 = 15
Therefore, you would need 15 sticks of butter for 150 cookies
What is the difference between the lithosphere and the crust?
a) The lithosphere is made of crust. The crust contains the upper mantle.
b) The lithosphere is characterized by its physical state (solid) while the crust is characterized by its composition (mostly oxygen, aluminum, and silicon).
c) Lithosphere is made up of iron and nickel. The crust is made of garlic bread.
d) The lithosphere is liquid. The crust is hot.
Answer:
The answer is B "The lithosphere is characterized by its physical state while the crust is characterized by its composition (mostly oxygen, aluminum, and silicon)
Which equation correctly describes the dissociation of sodium sulfate into ions in an aqueous media?
a. Na2SO4(aq) → 2Na+(aq) + SO42-(aq)
b. Na2SO4(aq) → 2Na+(aq) + S6+ (aq) + 4O2-(aq)
c. Na2SO4(aq) → Na2+(aq) + SO42-(aq)
d. Na2SO4(aq) → Na2S(aq) + 2 O2(g)
Na₂SO₄ (aq) → 2Na⁺ (aq) + SO4²⁻ (aq) correctly describes the dissociation of sodium sulfate into ions in an aqueous media
What is the dissociation reaction?Dissociation reactions are those reactions in which a molecule dissociates into their constitute ions.
In the question, dissociation of sodium sulfate takes place as follow:
Na₂SO₄ (aq) → 2Na⁺ (aq) + SO4²⁻ (aq)
Above reaction shows the dissociation of Na₂SO₄ where in the right side sodium ion is present in the +1 oxidation state and sulfate ion is present in the -2 oxidation state.
Hence, option (a) is correctly describes the dissociation.
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A nurse practitioner orders Medrol to be given 1.4 mg/kg of body weight. Medrol is an anti-inflammatory administered as an intramuscular injection. If a child weighs 71.6 lb and the available stock of Medrol is 20. mg/mL, how many milliliters does the nurse administer to the child? Express your answer to two significant figures and include the appropriate units.
The nurse give 2.3 ml Medrol to the child
Further explanationMass is one of the principal quantities, which is related to the matter in the object
The main mass unit consists of 7 units
kg, hg, dag, g, dg, cg, mg
Conversion :
1 Lb=0,453592 kg
For 71.6 lb :
[tex]\tt 71.6\times 0.453592=32.48~kg[/tex]
Medrol to be given 1.4 mg/kg of body weight, so amount for the child :
[tex]\tt 32.48~kg\times 1.4~mg/kg=45.472~mg[/tex]
The available stock of Medrol is 20. mg/mL, so the volume to the child :
[tex]\tt \dfrac{45.472}{20}=2.2736\approx2.3~ml[/tex]
Atoms are the smallest particles of a compound that still retain the properties of that
compound.
True or false
Answer:
the answer is true
Explanation:
it is the smallest particle in an element that takes part in a chemical reaction
Which subatomic particle has a negative charge in the atom?
Answer:
it B
Explanation:
im goeted like that
In going from room temperature 25° to 35 the rate of a reaction doubles calculate the activation energy for the reaction
Answer:
52.9 KJmol-1
Explanation:
From;
log(k2/k1) = Ea/2.303 * R (1/T1 - 1/T2)
The temperatures must be converted to Kelvin;
T1 = 25° C + 273 = 298 K
T2= 35°C + 273 = 308 K
R= gas constant = 8.314 JK-1mol-1
Substituting values;
log 2 = Ea/2.303 * 8.314 (1/298 - 1/308)
Ea = 52.9 KJmol-1
When a popsicle melts, the particles
A. there are no particles in popsicles
B. stay the same
C. lose thermal energy and slow down
D. gain thermal energy and speed up
Answer:
I think the answer is b but I could be wrong. but I believe the answer is b.
Explanation:
because As the popsicle melts, it goes through a change of state or phase change. A change of state when a substance changes physical form but not in molecule make up. The molecules do not change into something different they just gain or lose energy and movement.
With the melting of particles there has been the gain of thermal energy by the particles, that results in speeding up the particles. Thus, option D is correct.
A popsicle has been the ice frozen snack. The popsicle has been present in solid form. The melting of popsicles has been the change in the state of the matter from solid ice form to liquid form.
The change in the state of matter has been achieved with the loss or gain of energy. The solid has been the compact form, and with the gain of energy, there has been the increased motion of solid molecules. The increase in the motion results in the breaking of the attraction forces and results in the phase change.
Thus, when a popsicle melts there has been a gain of energy by the particles and increased motion. Thus, option D is correct.
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Cuando realizamos la "Estructura de
Puntos de Lewis" ¿Qué es lo que se
utiliza para su representación? *
Answer:
Electrones de valencia.
Explanation:
¡Hola!
En este caso, dado en química se conocen las estructuras de Lewis como representaciones gráficas de como los elementos están enlazados entre sí, debemos tener en cuenta que estos enlaces se forman entre los electrones de valenciam, los cuales son utilizados para su representación. Se sabe que los electrones de valencia son representados con puntos alrededor del elemento a través de puntos que se unen entre sí y son el número de electrons en la capa más externa de los elementos en cuestión; por ejemplo, cloro tiene 7 electrones de valencia, azufre tiene 6, hidrogeno 1, carbono 4 y así sucesivamente.
¡Saludos!
What happens when two cars converge
If a friend is making lemonade from an instant mix, which set of conditions would lead to a faster rate of dissolving the mix in the pitcher of water? Cold water and powdered lemonade Cold water and lemonade tablets Warm water and powdered lemonade Warm water and lemonade tablets
Answer: Warm Water and powdered lemonade.
Explanation: Water is faster at dissolving something and powder takes a smaller effort to dissolve.
Answer:
C
Explanation:
2. What type of answers will an investigator use to determine if a fire is arson?
Your answer:
Physical and Chemical
O Gas and Liquid
O None of the above
O All of the above
Answer:
What is this asking for?
Explanation:
I’ll put the answer in the comments
If you use a hammer to weather a piece of chalk is it physical or chemical weathering and how do you know?
The thermodynamic information for the following reaction is as follows:
HNO3 (g) + H2 (g) → NH3 (g) + H2O (g) △H = −637 kJ
1) Balance the chemical reaction.
2) Identify this reaction as endothermic or exothermic.
3) Calculate how much heat is released when 7.20 g of H2 reacts in this situation.
1. HNO₃ (g) + 4H₂ (g) ⇒ NH₃ (g) + 3H₂O (g)
2. Exothermic.
3. 2293.2 kJ
Further explanationReaction
HNO₃ (g) + H₂ (g) ⇒ NH₃ (g) + H₂O (g) △H = −637 kJ
1. Balance
give coefficient :
HNO₃ (g) + aH₂ (g) ⇒ bNH₃ (g) + cH₂O (g)
H, left=1+2a, right=3b+2c⇒1+2a=3b+2c(eq 1)
N,left=1, right=b⇒b=1
O,left=3, right=c⇒c=3
eq 1 : 1+2a=3.1+2.3⇒1+2a=9⇒2a=8⇒a=4
Balance reaction :
HNO₃ (g) + 4H₂ (g) ⇒ NH₃ (g) + 3H₂O (g)
2. exothermic⇒release heat(negative sign)
3. heat released :
mol H₂ :
[tex]\tt mol~H_2=\dfrac{7.2}{2}=3.6[/tex]
heat released :
[tex]\tt -637\times 3.6=-2293.2~kJ[/tex]
"I think of a number, multiply it by itself and then add 6 to the result
+
Answer:
ok 3 = 9 15 i got 15 so what
Explanation:
3. Which of the elements listed below would you expect to form ions with a positive one charge?
Chlorine
Lithium
Sodium
Magnesium
Answer:
Lithium and Sodium
Explanation:
Mitosis occurs during which phase?
Answer:
Prophase
Explanation:
Prophase is the first stage in mitosis, occurring after the conclusion of the G2 portion of interphase. During prophase, the parent cell chromosomes — which were duplicated during S phase — condense and become thousands of times more compact than they were during interphase.
What minimum energy is required to excite a vibration in HF?
Express your answer in joules to three significant figures.
En=(n+12)hν is the equation
Answer:
The energy of a vibrating molecule is quantized much like the energy of an electron in the hydrogen atom. The energy levels of a vibrating molecule are given by the equation: En=(n+21)hv where n is a quantum number with possible values of 1, 2, ... and v is the frequency of vibration.
Explanation:
hope it helps.
have a wonderful day!
Write the electron configuration, the orbital notation, and the noble gas notation for the following elements:
A) P
B) I
C) Pb
D) F
Answer:
See explanation
Explanation:
The electron configuration of an atom means a detailed arrangement of the electrons in the atom in orbitals. It normally begins from the least energetic orbitals to the most energetic orbital.
For each of the elements, their electronic configuration in terms of the nearest noble gas is shown below;
P - [Ne] 3s2 3p3
I- [Kr] 4d10 5s2 5p5
Pb- [Xe] 4f14 5d10 6s2 6p2
F- [He] 2s2 2p5
#P
Phosphorus lies after Neon
Z=15EC given by
[tex]\\ \rm\Rrightarrow [Ne]3s^23p^3[/tex]
#I
Lies after Krypton
EC given by
[tex]\\ \rm\Rrightarrow [Kr]5s^24d^105p^5[/tex]
#Pb
Lead lies after XenonEC given by
[tex]\\ \rm\Rrightarrow [Xe]6s^25d^{10}4f^{14}6p^2[/tex]
#
Fluorine lies after heliumEC given by
[tex]\\ \rm\Rrightarrow [He]2s^22p^5[/tex]