The total number of :
(a) p electrons in n (z=7) is 3
(b) s electrons in si (z=14) is 6
(c) 3d electrons in s (z=16) is 0
Electronic configuration:
The distribution of electrons in an element's atomic orbitals is described by the element's electron configuration. Atomic electron configurations adhere to a standard nomenclature in which all atomic subshells that contain electrons are arranged in a sequence with the number of electrons they each hold expressed in superscript.
The electronic configuration of z=7 (nitrogen) is 1s²2s²2p³
Total number of p electrons = 3
The electronic configuration of z=14 (silicon) is 1s²2s²2p⁶3s²3p²
Total number of s electrons = 2+2+2=6
The electronic configuration of z=16 (sulphur) is 1s²2s²2p⁶3s²3p⁴
Total number of 3d electrons = 0
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Answer:
3, 6, 0
Explanation:
In an endothermic reaction, what happens to the surroundings?
A. The bond energy is greater than 600 kJ.
B. The bond energy is less than 600 kJ.
C. The temperature increases.
D. The temperature decreases.
Answer: the temperature decreases
Explanation:
- An endothermic reaction absorbs heat which is taken from its immediate surroundings, causing the temperature to decrease
hope this helps :)
In forming a molecular compound, each atom should have ______ electrons around it unless there is some specific reasons why this cannot be achieved.
In forming a molecular compound, each atom should have valence electrons around it unless there is some specific reasons why this cannot be achieved.
What is Valence Electrons ?Valence electrons is a negatively charged particle present in the outermost shell of an atom.
Example: Oxygen has 6 valence electrons in its outermost shell, Water has 8 valence electrons.
Thus from the above conclusion we can say that In forming a molecular compound, each atom should have valence electrons around it unless there is some specific reasons why this cannot be achieved.
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3. as a substitution reaction occurs, the number of electrons shared between
carbon atoms
a) increases
b) decreases
c) remains the same
c) remains the same
In a substitution reaction, number of electrons remain the same.
What is a substitution reaction?
When one functional group in a chemical molecule is replaced by another functional group, the chemical reaction is known as a substitution reaction.
It is also known as single displacement reaction or single replacement reaction.
Example: Iodoethane and water are produced when hydrogen iodide and ethanol combine.
CH₃CH₂OH + HI → CH₃CH₂I + H₂O
In this reaction OH is substituted or replaced by I giving CH₃CH₂I.
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Consider two gases, A and B, are in a container at room temperature. What effect will the following changes have on the rate of the reaction between these gases? The temperature is decreased at a constant volume.
Answer:
decrease in temperature , decreases the kinetic movements of the gase molecules as a result decreases the frequency of collisions between gas molecules A and B consequently decreases the rate of reactions of gases A and BQuestion 2 of 15
Which statement is true of both nuclear fusion and nuclear fission?
A. The nucleons in the resulting nuclei differ from the nucleons in the
original nuclei.
B. The products are nuclei of elements that are different from the
original elements.
C. All the nuclei involved in the nuclear reaction represent the same
element.
D. The nucleons in the original nuclei are destroyed by the process.
Answer:
B. The products are nuclei of elements that are different from the original elements.
A teacher divides her class into groups and assigns each
group the task of measuring the mass of the same object
three times. The teacher already knows that the mass of
the object is 25 g.
Based on the results each group records, which group makes the most
precise measurements of the object?
O
A. Group C: 32.1 g, 35.0 g, 25.0 g
O
B. Group B: 25.5 g, 25.0 g, 24.8 g
O
C. Group A: 28.5g, 28.4 g, 28.5 g
O D. Group D: 20.0 g, 25.0 g, 30.09
Answer:
Group C
Explanation:
Precision is how close the values are to each other
Sorry this is a bit long
b. The following reaction takes place in an acidic solution. Use the following steps to balance the equation. (5 points)
Zn(s) + NO3–(aq) Zn2+(aq) + NO(g)
i. Write the reduction and oxidation half-reactions (without electrons). (1 point)
ii. Balance the equations for atoms. Use H2O and H+ to balance O and H. (1 point)
iii. Balance the equations for charge. (1 point)
iv. Equalize charges for the two half-reactions. (1 point)
v. Add the equations and simplify to get a balanced equation. (1 point)
The overall balanced reaction equation is;
4Zn(s) + 10H^+(aq) + NO3^-(aq) -----> 4Zn^2+(aq) + NH4^+(aq) + 3H2O(l)
What is the balanced reaction equation?The redox reaction equation is said to be balanced when the number of electron gained is equal to the number of electrons lost.
Now;
1. Reduction and oxidation half-reactions
Zn(s) -----> Zn^2+(aq) + 2e
And
NO3^-(aq) ---->NH4^+(aq) + 3H2O(l)
2. Using the H2O and H+ to balance O and H;
4Zn(s) + 10H^+(aq) + NO3^-(aq) -----> 4Zn^2+(aq) + NH4^+(aq) + 3H2O(l)
3. Balancing the electrons lost and gained; 4Zn(s) + 10H^+(aq) + NO3^-(aq) + 8e -----> 4Zn^2+(aq) + NH4^+(aq) + 3H2O(l) + 8e
4. The overall balanced reaction equation is;
4Zn(s) + 10H^+(aq) + NO3^-(aq) -----> 4Zn^2+(aq) + NH4^+(aq) + 3H2O(l)
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What's the difference between a sigma bond and pi (π) bond?
Also, please state the three types of hybridization.
Answer:
Sigma bonds are formed by the Head-to-head overlapping of atomic orbitals while Pi bonds are formed by the lateral overlapping of two atomic orbitals.Types of hybridization:1) sp hybridization.2) sp² hybridization.3) Sp^3 hybridization.Hope this helps.Good luck ✅.You are a paleontology professor working at a dig site looking for fossils. You come across a deposit that is emitting radiation. Upon further testing you find that the sample is changing from carbon (atomic number 6) into nitrogen (atomic number 7) as radiation is emitted. What type of radiation is it?
A. Gamma
B. Delta
C. Beta
D. Alpha
The type of radiation in this scenario is Beta and is denoted as option C.
What is Beta radiation?This is a high-speed electron which is emitted when the nucleus undergoes a radioactive decay during the process of beta decay.
In this scenario the electron is denoted as e with a superscript and subscript of 0 and -1 respectively which is the reason for the change from carbon to nitrogen.
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500 cm3 of H2 gas at STP
Contradictions of hydrogen
Answer:
letter to your mother telling her about the celebrations of your birthday at school
In a reaction between iron(II) sulfide and oxygen, iron(III) oxide and
sulfur dioxide are produced. How many moles of O₂ is required to
produce 7.66 moles of Fe₂O3?
4FeS + 70₂ + 2Fe₂O3 + 4S02
a 26.81 moles
b 2.17 moles
c 7.60 moles
d None of the above
Answer:
26.81 moles
Explanation:
From the coefficients of the equation, we know that for every 2 moles of iron(III) oxide produced, 7 moles of oxygen are consumed.
So, the answer is 7.66(7/2), which is 26.81 mol.
In a sample consisting of 2.50 g of methane (CH4), there are _____ x 1023 atoms present. Complete the number using standard scientific notation.
In a sample consisting of 2.50 g of methane (CH4), there are 4.5 × 10²³ atoms present.
How to calculate the number of mole ?To calculate the number of moles it is expressed as
Number of moles = [tex]\frac{\text{Given mass}}{\text{Molar mass}}[/tex]
= [tex]\frac{2.50\ g}{16\ g/mol}[/tex]
= 0.15 mol
1 mole of methane contains 6.022 × 10²³ molecules
0.15 mole of methane will contain
= [tex]\frac{0.15 \times 6.022 \times 10^{23}}{1}[/tex]
= 0.9 × 10²³ molecules
= 0.9 × 10²³ × 5 atoms
= 4.5 × 10²³ atoms of methane
Thus from the above conclusion we can say that In a sample consisting of 2.50 g of methane (CH4), there are 4.5 × 10²³ atoms present.
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8. A 15.0 gram unknown piece of metal at 99 oC is added to 75 grams of water at 23 oC. The final temperature of the metal and water is 26 oC. What is the specific heat of the unknown metal? (Remember that the specific heat of water is 4.18 J/g* oC.)
The specific heat of the unknown metal is 0.859 J/g⁰C.
Specific heat of the unknown metal
Heat lost by the unknown metal = Heat gained by water
m₁c₁Δθ₁ = m₂c₂Δθ₂
where;
c₁ is specific heat of the unknown metalc₂ is specific heat of water(15)(c₁)(99 - 26) = (75)(4.18)(26 - 23)
1095c₁ = 940.5
c₁ = 940.5/1095
c₁ = 0.859 J/g⁰C
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I need help with this ASAP pls
Answer:
2c 1s
Expination: it came by there are 2carbon and 1sulphur
Answer:
2c1s
Explanation:
2c1s make me brainlist
How many grams of carbon are contained in one mole of C3H8?
Answer:
The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles C3H8, or 44.09562 grams
How many moles of NH3 would be formed from the complete reaction of 16.0 g H2?
Taking into account the reaction stoichiometry, 5.33 moles of NH₃ are formed from the complete reaction of 16 grams of H₂.
Reaction stoichiometryIn first place, the balanced reaction is:
N₂ + 3 H₂ → 2 NH₃
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
N₂: 1 moleH₂: 3 molesNH₃: 2 molesThe molar mass of the compounds is:
N₂: 14 g/moleH₂: 2 g/moleNH₃: 17 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
N₂: 1 mole ×14 g/mole= 14 gramsH₂: 3 moles ×2 g/mole= 6 gramsNH₃: 2 moles ×17 g/mole=34 gramsMass of NH₃ formedThe following rule of three can be applied: if by reaction stoichiometry 6 grams of H₂ form 2 moles of NH₃, 16 grams of H₂ form how many moles of NH₃?
[tex]moles of NH_{3}= \frac{16 grams of H_{2} x2moles of NH_{3}}{6 grams of H_{2}}[/tex]
moles of NH₃= 5.33 moles
Then, 5.33 moles of NH₃ are formed from the complete reaction of 16 grams of H₂.
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enna took an open bowl of leftover mashed potatoes from the refrigerator and noticed a difference in smell. She determined that chemical changes occurred since the potatoes were first placed there.
Which observations most likely led to Jenna’s conclusion?
a change of odor
a decrease in temperature
a change in moisture content
a decrease in mass
a 3.140 molar solution of NaCl is prepared. how many grams of NaCl are present in a sample containing 3 kg of water
2. The force of attraction between the particles is greater in ice than in water.
True or false
Answer:
true
Explanation:
your answer is ture
The statement is true: the force of attraction between particles is greater in ice than in water.
The force of attraction between particles (molecules or atoms) is greater in ice than in water. In the solid state, such as in ice, the particles are closely packed in a regular crystalline structure. The intermolecular forces, specifically hydrogen bonding between water molecules, are strong, leading to a higher force of attraction.
In contrast, in the liquid state, such as in water, the particles have more freedom of movement. The intermolecular forces are still present but are weaker compared to the solid state, resulting in a lower force of attraction between the particles.
Therefore, the statement is true: the force of attraction between particles is greater in ice than in water.
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8.Your protocol calls for working with a 1.5 x 10-4 M boric acid solution. To save shelf space, you decide to make up a 20X stock solution. What is the molarity of the stock solution you just made
The molarity of the stock solution is 7.5 * 10 ^- 6 M.
Molar attention is a measure of the awareness of a chemical species, especially of a solute in an answer, in terms of the quantity of substance consistent with the unit quantity of the answer. In chemistry, the maximum generally used unit for molarity is the range of moles according to liter, having the unit symbol mol/L or mol/dm³ in the SI unit.
Molarity (M) is the quantity of a substance in a positive volume of answer. Molarity is described because the moles of a solute in step with liters of an answer. Molarity is also called the molar awareness of a solution.
Molarity is defined as the range of moles of solute consistent with the liter of answer. Molality is described because of the number of moles of solute per kilogram of solvent. Normality is described as the variety of equivalents in line with the liter of answers.
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HELP ASAP
Below are descriptions of two different objects that begin at rest and then now forces acting on them as described below.
Object 1: A skateboard with unbalanced forces
Object 2: A bicycle with balanced forces
Which statement is true about the objects?
A:Both objects are moving.
B: Both objects are not moving.
C:Object 1 is moving, and Object 2 is not moving.
D:Object 1 is not moving, and Object 2 is moving.
Answer:
C: Object 1 is moving, and Object 2 is not moving
Explanation:
Object one has unbalanced forces, so it can cause it to start moving ,since one force is moving stronger than its opposing one, but since Object 2 has balanced forces both forces hold it in place.
Set up the math problem. But don’t do any of it. Just leave your answer as a math expression. Also be sure you’re answering clues all the correct the units symbols.
Answer:
Length = 681 grams / (44.5 grams / kilometers) = (681 / 44.5) kilometers
Explanation:
The diameter is there to throw us off, so ignore that. There is 681 grams of wire, and since there is 44.5 grams of copper per km of wire, and we want to know how many kilometers of wire makes 681 grams, the equation would be X*44.5 = 681, or X = 681/44.5
Also quora's censoring system is terrible i can't even say kilometers by adding the letter s after "km"
The radius of a hydrogen atom is 5.29 x 10-11m. What is the electric force between the single proton and the single electron of a hydrogen atom
The radius of a hydrogen atom is 5.29 × 10⁻¹¹ m. The electric force between the single proton and the single electron of a hydrogen atom is 7.94 × 10⁻⁸ N.
What is Coulomb's law ?[tex]F = \frac{1}{4 \pi \epsilon_{0}} \cdot \frac{q_1 q_2}{r^2}[/tex]
where,
F = Electric Force
k = Coulomb constant
r = distance of separation
Now,
[tex]F = \frac{1}{4 \pi \epsilon_{0}} \cdot \frac{q_1 q_2}{r^2}[/tex]
[tex]= \frac{1}{4 \pi \epsilon_{0}} \cdot \frac{e^2}{r^2}[/tex]
[tex]= \frac{1}{4 \pi\ 8.85 \times 10^{-12}} \cdot (\frac{1.6 \times 10^{-19}}{5.29 \times 10^{-11}})^{2}[/tex]
= 7.94 × 10⁻⁸ N
Thus from the above conclusion we can say that The radius of a hydrogen atom is 5.29 × 10⁻¹¹ m. The electric force between the single proton and the single electron of a hydrogen atom is 7.94 × 10⁻⁸ N.
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A sample of an ideal gas has a volume of 2.30 L at 281 K and 1.02 atm. Calculate the pressure when the volume is 1.41 L and the temperature is 298 K.
A sample of an ideal gas has a volume of 2.30 L at 281 K and 1.02 atm. 1.76 atm is the pressure when the volume is 1.41 L and the temperature is 298 K.
What is Combined Gas Law ?This law combined the three gas laws that is (i) Charle's Law (ii) Gay-Lussac's Law and (iii) Boyle's law.
It is expressed as
[tex]\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}[/tex]
where,
P₁ = first pressure
P₂ = second pressure
V₁ = first volume
V₂ = second volume
T₁ = first temperature
T₂ = second temperature
Now put the values in above expression we get
[tex]\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}[/tex]
[tex]\frac{1.02\ atm \times 2.30\ L}{281\ K} = \frac{P_2 \times 1.41\ L}{298\ K}[/tex]
[tex]P_{2} = \frac{1.02\ atm \times 2.30\ L \times 298\ K}{281\ K \times 1.41\ L}[/tex]
P₂ = 1.76 atm
Thus from the above conclusion we can say that A sample of an ideal gas has a volume of 2.30 L at 281 K and 1.02 atm. 1.76 atm is the pressure when the volume is 1.41 L and the temperature is 298 K.
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At constant pressure, the ratio between the volume expansion of a mole of gas with a high Cp to that of a mole of gas with a low Cp for a given heat input will be
At constant pressure, the ratio between the volume expansion of a mole of gas with a high Cp to that of a mole of gas with a low Cp for a given heat input is Less than 1.
How are Cp and Cv related to one another?The molar heat capacity of a substance is expressed as Cp when the pressure is constant and as Cv when the volume is constant. These two parameters so describe the molar heat capacity at various pressures and temperatures.
Constant Volume and PressureThe first law of thermodynamics states that heat delivered to a system can either be converted into internal energy or used to generate work in the environment. An isochoric process is one in which the volume is constant, whereas an isobaric process is one in which a gas interacts with its surroundings at constant pressure.
Constant PressureAn isobaric process takes place at constant pressure. Since the pressure is constant and the work is denoted by PV, the force applied is constant.
If gas is to expand at an isobaric pressure at a certain pressure, heat must be introduced into the system at a specific rate. For instance, a movable piston in a cylinder keeps the pressure inside the cylinder constant at atmospheric pressure despite the fact that it is isolated from the atmosphere. In other words, a moveable barrier serves as a dynamic link between the system and a constant-pressure reservoir.
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how do gas molecules move across a room
Answer:
It expands to its secluded area.
Explanation:
Any substance that is heated will have its molecules and atoms move more quickly, expanding the distance between them all. The term "expansion" is used more frequently to describe this growth in space. Heat causes all stuff, including solids, liquids, and gases, to expand.
In some cases, heating solids causes them to transform into liquids. However, they could revert to their solid state after cooling. Similar to this, certain liquids turn into gaseous states when heated. Instead of altering their condition, gases, on the other hand, frequently expand and raise the pressure inside a container.
Scientists typically blow up balloons to test the expansion of gases, exposing some to the light while leaving others at room temperature. It is demonstrated that heat causes gases to expand when balloons exposed to the sun grow in size while those at ambient temperature remain unchanged.
The diagram below shows the different phase transitions that occur in matter. Three bars are shown labeled Solid, Liquid, and Gas. They are connected by arrows labeled 1 to 6. Arrow 1 points from liquid to gas; arrow 2 from solid to liquid, arrow 3 from solid to gas, arrow 4 from gas to liquid, arrow 5 from liquid to solid, and arrow 6 from gas to solid. Which arrow would most likely represent the phase change that involves the same amount of energy as arrow 1? 2 3 4 5 Mark this and r
The arrow that will represent the phase change that involves the same amount of energy as arrow 1 will be arrow 4.
Phase changeArrow 1 represents a phase change from liquid to gas while arrow 4 represents a phase change from gas to liquid.
In other words, arrow 1 and arrow 4 are direct opposites of one another,
This means that if X amount of energy is required for arrow 1, the same amount of energy will be needed for arrow 4 but in the reverse direction.
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Answer:
The correct answer would be option C. 4!
Explanation:
Hope this helped confirm :)
I just got this question right on Edge :P
A gas at 300 k and 4.0 atm is moved to a new location with a temperature of 250 k. the volume changes from 5.5 l to 2.0 l. what is the pressure of the gas at the new location? use the formula: p1v1 t1 = p2v2 t2
Answer:
9.17 atm
Explanation:
To find the new pressure of the gas, you need to use the following manipulated formula:
P₁V₁ / T₁ = P₂V₂ / T₂
In this formula,
P₁ = initial pressure (atm) P₂ = new pressure (atm)
V₁ = initial volume (L) V₂ = new volume (L)
T₁ = initial temperature (K) T₂ = new temperature (K)
Because you have been given values for all of the variables except for the new pressure, you can substitute them into the equation and simplify.
P₁ = 4.0 atm P₂ = ? atm
V₁ = 5.5 L V₂ = 2.0 L
T₁ = 300 K T₂ = 250 K
P₁V₁ / T₁ = P₂V₂ / T₂ <----- Given formula
(4.0 atm)(5.5 L) / (300 K) = P₂(2.0 L) / (250 K) <----- Insert variables
0.073333 = P₂(2.0 L) / (250 K) <----- Simplify left side
18.33333 = P₂(2.0 L) <----- Multiply both sides by 250
9.17 = P₂ <----- Divide both sides by 2.0
Answer:
=> 13.2 atm
Explanation:
From the question, we have question we have been provided with pressure, volume and temperature. Based on these variables, we are supposed to use the combined gas law formula (P1V1T1 = P2V2T2)
At location 1;
P1 = 4.0 atm
V1 = 5.5 L
T1 = 300 K.
At location 2;
P2 = ?
V2 = 2.0 L
T2 = 250 K.
We are required to determine the pressure (P2).
To begin, we make pressure (P2) the subject of in the formula:
P2 = (P1V1T1)/(V2T2) ................ eq. (i)
Then substitute the known values into the eq. (i).
P2 = (4.0 x 5.5 x 300)/(2.0 x 250) atm
= 13.2 atm.
Therefore, the pressure (P2) at location 2 is 13.2 atm.
Write the complete chemical formula for the unknown compound.
The complete chemical formula for the unknown compound will be [tex]C_2H_6[/tex]
Chemical formulaThe chemical formula of the compound is [tex]C_2H_x[/tex] and x is supposed to be a whole number.
In the analysis, C = 2.22 moles and H = 6.7 moles
Dividing both by the smallest: C = 1 and H = 3
Thus, the empirical formula of the compound will be [tex]CH_3[/tex]
But since the compound is [tex]C_2H_x[/tex], it means both C and H are multiplied by 2.
The chemical formula will, therefore, be [tex]C_2H_6[/tex]
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What mass of Na2CrO4 is required to precipitate all of the silver ions from 75.0 mL of a 0.100 M solution of AgNO3
The mass of [tex]Na_2CrO_4[/tex] required will be 0.6075 g.
Calculation of mass:
The reaction:
[tex]Na_2CrO_4 + 2AgNO_3 \rightarrow Ag_2CrO_4 + 2NaNO_3[/tex]
Volume of [tex]AgNO_3[/tex] = 75 mL
Concentration of [tex]AgNO_3[/tex] = 0.100 M
Step 1:
Molarity is moles of solute in 1000 mL of the solution.
[tex]M=\frac{n}{V}\times 1000\\\\ n=\frac{M\times V}{1000} \\\\n=\frac{0.100\times 75}{1000}\\\\n= 0.0075[/tex]
Moles of [tex]AgNO_3[/tex] = 0.0075
Step 2:
From the above equation,
2 moles of [tex]AgNO_3[/tex] is precipitated by 1 mole of [tex]Na_2CrO_4[/tex]
So, 0.0075 moles will be precipitated by-
[tex]\frac{1}{2}\times 0.0075[/tex] moles of [tex]Na_2CrO_4[/tex]
= 0.00375 moles of [tex]Na_2CrO_4[/tex]
Step 3:
[tex]mole=\frac{Given \,weight}{Molar\, mass} \\[/tex]
Molar mass of [tex]Na_2CrO_4[/tex] = 162 g/mol
[tex]0.00375=\frac{x}{162} \\x= 0.00375\times 162\\x= 0.6075 g[/tex]
So, Mass of [tex]Na_2CrO_4[/tex] required will be 0.6075 g.
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