Answer:
Electrically neutral atoms simply possess the same number of electrons as protons. This gives the objects a balance of both type of charge. There are 11 electrons and 10 protons. This results in an imbalance of charge.
- Physicsclassroom
Answer:
Electrically neutral atoms possess the same number of electrons as protons. (It gives the objects a balance of both type of charge).
Explanation:
12. Most metals share four common physical characteristics. Which of the options is not one of the four?
O D. Conductivity
O A Luster
O B. Conductivity
O C. Malleability
O E Reactivity
Answer:
E Reactivity
Explanation:
Reactivity is not one of the properties shared by metals with one another.
The reactivity of a substance is its ability to combine with other substances. Reactivity is not used to measure the physical property of a metal.
Physical properties are those that we can sense with our senses. For metals, conductivity, luster, malleability are all properties of metals. They can be examined using our active senses.The physical properties observed in metals derives from the metallic bonds within their atomic structure.
Conductivity, luster, malleability, ductility, magnetism etc. are some of the other physical properties of metals.
Someone please help! Hurry
1. For a mixture of pure hexane and pure dimethylformamide, the dimethylformamide layer will be found as:______.a. the top layer.b. the bottom layer.c. neither; the two solvents are miscible.d. cannot determine.2. To extract aniline (CeH5NH2) from a solution of chloroform, one would use:_____.a. aqueous HCI.b. aqueous NaOH.c. aqueous NaHCO3.d. either b or c would work.3. For mixture of methylene chloride and diethyl ether, the diethyl ether layer will be found as:____.a. the top layer.b. the bottom layer.c. neither; the two solvents are miscible.d. cannot determine.4. To extract benzyl alcohol (CeH5CH2OH) from a solution of chloroform, one would use:_____.a. aqueous HC b. aqueous NaOH.c. aqueous NH3.d. either B or C would work.5. A large partition coefficient for the extraction of naphthalene into diethyl ether from water means that naphthalene will be found:______.a. only in the water layer.b. only in the diethyl ether layer.c. mostly in the water layer.d. mostly in the diethyl ether layer.
Answer:
1. the bottom layer
2. aqueous HCI
3. the top layer
4.aqueous NaOH
5. mostly in the diethyl ether layer
Explanation:
Pure dimethylformamide is considerably more polar than hexane hence thee two solutions will form two phases with the pure dimethylformamide as the bottom layer.
If we want to extract aniline from chloroform, HCl must be added in order to give a salt that can be extracted into the aqueous layer.
For a mixture of methylene chloride and diethyl ether, the diethyl ether layer will be found as the top layer since it is considerably less polar than methylene chloride.
Benzyl alcohol can be extracted from a solution of chloroform by adding NaOH and extracting it into an aqueous layer.
A large partition coefficient for the extraction of naphthalene into diethyl ether from water means that naphthalene will be found mostly in the diethyl ether layer.
Incorrect
Question 8
0/5 pts
(03.03 MC)
The diagram below represents a convection cell. The arrows
indicate the direction of air flow:
Need HELP HURRY
Which of the following is not true
regarding ozone?
A. It contains 3 oxygen atoms
B. It is just like regular oxygen
C. It protects us from UV light
D. It is a layer within another layer in our
atmosphere
Answer:
B
Explanation:
In a neutral atom, the number of protons is always equal to what other part of the atom?
a.The sum of electrons and neutrons
b.The number of electrons
c.The number of neutrons
d.The number of neutrons
Answer:
b. The number of electrons
Explanation:
A "neutral atom" has a neutral charge. This means that its charge is equal to zero. In order for the charges to cancel out each other, the atom's positive charge should be equal to the negative charge. These being said, the number of electrons (negatively-charged) is then equal to the number of protons (positively-charged). Those atoms which are not neutral are called "ions." This means that they either have more or less electrons than the protons.
If an atom has 3 lone pairs of electrons, how many total electrons are
there?
Answer:
15
Explanation:
im right
3. A solution is neutral if it has more hydronium ions than hydroxide ions.
a. True
b. False
Answer:
false
Explanation:
Identify the statements that correctly describe the saturation temperature of a solution. Select one or more:_________ a. Any temperature at which the solution is liquid The temperature at which b. the Ksp value can be calculated c. The temperature at which solid begins to appear from a cooled solution d. Any temperature at which all of the compounds is solid
Answer:
The correct options are "b" and "c". A further explanation is given below.
Explanation:
Saturation temperature can be determined where this enough of some other solution that is incorporated like that can be absorbed by a solvent. The formulation is saturated at this same stage, so Ksp could be computed. As well as the solid throughout solution should continue to appear upon freezing below a certain temperature.The other options offered aren't relevant to the situation described. So the equivalents above are the right ones.
The statements that are correctly explained the saturation temperature of a solution is the ksp value should be determined and the temperature where the solid started to appear from the cooling solution.
What is the Saturation temperature?It could be measured when there should be sufficient of some other solution that should be incorporated and the same should be absorbed by the solvent. The formulation should be saturated at a similar stage due to this the ksp should be determined. Also, the solid via the solution should continue to appear that based on the freezing below the specific temperature.
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Please help me my teacher is screaming at me rn :(
are suppose to make ur own problem if so
I would do for time 2 distance would be 4 and keep adding on 2 example
time: 2
distance:4
time: 4
distance: 8
what is the isotope formed during radioactive decay
Answer: Except for gamma decay or internal conversion from a nuclear excited state, the decay is a nuclear transmutation resulting in a daughter containing a different number of protons or neutrons (or both). When the number of protons changes, an atom of a different chemical element is created.
Explanation:
A student is asked to build a model of an atom with 6 protons and 6 electrons. The student is then asked to make an identical model of the same atom but make it an ion. To be successful in this project, the student will:
A.Put six protons in the center of the model, and six electrons around the outside, then add one electron or take away one electron to make an ion.
b.Place electrons and protons in the center of the atom and create an ion by adding one more proton and one more electron to the center of the atom.
c.Put the electrons in the middle of the model and distribute the electrons around the protons. The ion will have seven protons.
d.Put six protons in the center of the atom and distribute the electrons around the protons. The ion will look the same but have seven or five electrons.
Answer:
A. Put six protons in the center of the model, and six electrons around the outside, then add one electron or take away one electron to make an ion.
Explanation:
To make an ion from a given atom, either one electron is added to it or taken away from it.
Protons are the positively charged particles in an atomNeutrons do not carry any chargesElectrons are the negatively charged particlesIn an atomic space, protons and neutrons occupy the center of the atom called nucleus.
Electrons moves round the extranuclear space.
Put the six protons in the center of the model The put the six electrons in the outer space. Then add or take away one or more electrons.This gives an ion.
The circles, or orbits, for electrons are called energy levels. Each level can hold only a certain number of electrons. Add electrons to each level until you can add any more. How many electrons can each level hold?
IF YOU GIVE ME THE RIGHT ANSWER I WILL GIVE YOU BRAINIEST OR WHATEVER ITS CALLED!!!!!!!
Btw this subject is Science but I couldn’t find it so I just put chemistry.
Answer: n = 1 can hold a maximum of 2 electrons
n = 2 , maximum 8 electrons
n = 3, maximum 18 electrons
As per the principles of quantum mechanics, the number of electrons that can be added to a given energy level is deduced based on the three quantum numbers: n, l , m(l) and m(s)
'n' is the principal quantum number which defines the energy level. It can take on integer values: 0,1,2,3...
'l' is the angular momentum quantum number which defines the shape of the orbital that an electron occupies
l = 0,1,2...(n-1)
where: l = 0 corresponds to s-orbital
l = 1 corresponds to p-orbital
l = 2, corresponds to d-orbital
'm(l)' is the magnetic moment quantum number which defines the orientation of an orbital in space.
m(l) = -l, 0, +l
'm(s)' is the spin quantum number which defines the orientation of an electron is an orbital m(s) = +1/2 or -1/2
An s, p or d-orbital can accommodate a maximum of 2, 6 and 10 electrons respectively For energy level with n= 1
l = 0, i.e. s-orbital or 1s.
Therefore, the maximum number of electrons for a 1s orbital would be 2 resulting in an electron configuration of 1s²
For energy level with n= 2
l = 0, 1 i.e. s and p-orbitals
The maximum number of electrons would be
Electron configuration: 2s²2p⁶
For energy level with n= 3
l = 0, 1, 2 i.e. s, p and d-orbitals
The maximum number of electrons would be
Electron configuration: 3s²3p⁶3d¹⁰
help please! worth 100 points!
Answer:
THIS IS ONLY WORTH 50 POINTS LIAR LOL
Explanation:
BUT ILL DO IT ANYWAY GIVE ME A SEC
Answer:
Read below
Explanation:
Ionic compounds are compounds composed of ions, charged particles that form when an atom (or group of atoms) gains or loses electrons. (A cation is a positively charged ion; an anion is a negatively charged ion.) Covalent or molecular compounds form when elements share electrons in a covalent bond to form molecules.
If you have 0.341 m3 of water at 25.0 ∘C in an insulated container and add 0.127 m3 of water at 95.0 ∘C, what is the final temperature f of the mixture? Use 1000 kg/m3 as the density of water at any temperature.
Answer:
[tex]T_F=44.0\°C[/tex]
Explanation:
Hello!
In this case, since this calorimetry problem is about the mixing of two volumes of water, we can infer that the heat lost by the hot water is gained by the cold water so we can write:
[tex]Q_{W,hot}=-Q_{W,cold}[/tex]
Which in terms of mass, specific heat and temperature change is:
[tex]m_{W,hot}C_{W,hot}(T_F-T_{W,hot})=-m_{W,cold}C_{W,cold}(T_F-T_{W,cold})[/tex]
Clearly, the specific heat is the same for both waters and the masses, considering the given densities are:
[tex]m_{W,cold}=0.341m^3*\frac{1000kg}{1m^3} =341kg\\\\m_{W,hot}=0.127m^3*\frac{1000kg}{1m^3} =127kg\\[/tex]
Thus, we can solve for the the final temperature as shown below:
[tex]T_F=\frac{m_{W,hot}T_{W,hot}+m_{W,cold}T_{W,cold}}{m_{W,hot}+m_{W,cold}}[/tex]
And by plugging in the values we obtain:
[tex]T_F=\frac{341kg*25.0\°C+127kg*95.0\°C}{341kg+127kg}\\\\T_F=44.0\°C[/tex]
Best regards!
The final temperature of the mixture of hot and cold water at the given masses is 44 ⁰C.
The given parameters;
volume of the cold water, V = 0.341 m³ initial temperature of the wave, = 25⁰Cvolume of water added hot water, = 0.127 m³final temperature of water, = 95⁰ CThe mass of the cold water and the hot water are calculated as follows;
[tex]mass = density \times volume\\\\m_{cold} = 1000 \times 0.341 = 341 \ kg\\\\m_{hot} = 1000 \times 0.127 = 127 \ kg[/tex]
Apply the principle of conservation of energy to determine the final temperature of the mixture;
heat lost by the hot water = heat absorbed by the cold water
[tex]341 \times 4200 \times (t - 25) = 127 \times 4200 \times (95 - t)[/tex]
where;
t is the final temperature of the mixture[tex]341(t- 25) = 127(95-t)\\\\341t - 8525 =12065 - 127t\\\\468t = 20590\\\\t = \frac{20590}{468} \\\\t = 44 \ ^0C[/tex]
Thus, the final temperature of the mixture of hot and cold water at the given masses is 44 ⁰C.
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When completing an electron configuration, which of the following rules/principals show that you cannot label two electrons as having the same quantum numbers?
a
Law of Configuration
b
Aufbau Principle
c
Pauli Exclusion Principle
d
Hund's Rule
Answer:
C. Pauli Exclusion Principle
Explanation:
Pauli's exclusion basically suggests that you cannot label two electrons as having the same quantum numbers.
The principle is stated as "no two electrons in an atom can have the same set of four quantum numbers".
It indicates that no two electrons can spin in the same way. This limits the number of electrons that can reside in an orbital to two and with opposite spin.“gasoline boils at a relatively low temperature (about 150 C). the kerosene is removed at around 200C, followed by diesel oil at 300C and fuel oil at around 370C”.
What topic is the teacher most likely talking about?
A. distillation of a mixture
B. filtration of pure substance
C. evaporated of a mixture
D. sorting of a pure substance
Answer:
A. distillation of a mixture
Explanation:
The topic the teacher is most likely talking about is the distillation of a mixture.
During fractional distillation, a mixture is separated into it constituents based on differences in their boiling point.
A liquid made up of denser hydrocarbon such as crude oil is fed into the distillation chamber. It is then heated. At different boiling point of its constituents, the fractions begins to separate out. They rise in the column. The condensate is then collected.This process is the distillation of mixture.
Answer:
A is the correct answer (distillation of a mixture)
Explanation:
1
Which of the following is a true statement
about atomic nuclel?
A They are made up of protons, neutrons, and electrons
B They have
net positive charge
C Every atomic nucleus has the same number of particles
D
The atomic nucleus has no relation to an atom's mass
Answer:
I believe the answer is B
Explanation:
A nucleus of an atom has protons and neutrons. We know that a proton has a charge of +1 , while a neutron has no charge, or 0 . Therefore, the nucleus of an atom will always have a positive charge.
The beginning of this chemical equation represents the
starting materials for a chemical reaction,
H2O + S03 - ?
Which compound is likely produced by the chemical reaction?
A. HF
B. H2CO3
C. H2SO4
D. CO2
SUBMIT
Answer:
C. H₂SO₄
Explanation:
Given expression:
H₂O + SO₃ → H₂SO₄
In the chemical reaction, the product and the reactant have the same species.
Chemical reactions obeys the law of conservation of matter.
This way, atoms combine with one another to give a desired product. The products will contain a mix of the reactants.
Fluorine is not part of the reactantsCarbon is not part of the reactantsCarbon is not part of the reactants.Answer:
cccccccccc
Explanation:
How do clouds relate to climate change
Answer:
Clouds can block light and heat from the Sun, making Earth's temperature cooler. You've probably noticed this kind of cooldown on a cloudy day. However, some heat from the Sun does get down to Earth. Clouds can trap that heat from the Sun.
Hope that helps :)
What elements would likely form an ionic bond?
a. C & O
b. Mg & Cl
c. Mg & Ca
d. Cl & Ar
When electrons are ______________ from one atom to another, we say the bond is ionic.
a. transferred
b. shared
How many electrons does 47Ag+1 have?
107
47
48
46
Answer:
b. Mg & Cl
a. transferred
46
Explanation:
Ionic bonds form between metals and non-metals when electrons are transferred from one specie to another.
The electrostatic attraction from the resulting ions forms the ionic bonds. A metal is electropositive and will readily donate electronsA non-metal is electronegative and will accept electrons. This creates two oppositely charge ions that attracts by means of ionic bonding.Since Mg and Cl are the only metal - non-metal pair, and ionic bond will form between them.
2.
In the specie;
₄₇Ag¹⁺
47 is the atomic number of the element Ag.
The atomic number is the number of protons in an atom. For a specie in neutral state, the number of protons and electrons are the same.
When an atom loses electron, it becomes positively charged. Here Ag has lost one electron and then, the number of electrons becomes 46. The number of protons is still 47Is weathering a constructive or deconstructive process?
How many grams of argon (Ar) are in 32.1 moles?
Answer:
The answer is 39.948.
Explanation:
you are converting between grams Argon and mole. You can view more details on each measurement unit: molecular weight of Argon or mol The molecular formula for Argon is Ar. The SI base unit for the amount of substance is the mole.
Answer:The answer is 0.025032542304996.
Explanation:
We assume you are converting between moles Argon and gram. You can view more details on each measurement unit: molecular weight of Argon or grams The molecular formula for Argon is Ar. The SI base unit for amount of substance is the mole.
Construct the inequality for the following cases.
Bina ketaksamaan bagi kes-kes berikut.
1.
The sum of x and y are less than 50.
Answer:
x + y < 50
Explanation:
5ml of mixture of CH4 and C2H4 need 13.2 ml of oxygen for complete combustion.calculate the volume of each gas in the mixture based on the law of gaseous volume.
Answer:
Explanation:
CH₄ + 2O₂ = CO₂ + 2H₂O
C₂H₄ + 3O₂ = 2CO₂ + 2H₂O
Let volume of CH₄ be V , so volume of C₂H₄ will be 5 - V
CH₄ + 2O₂ = CO₂ + 2H₂O
1 vol 2 vol
V 2 V
V vol of CH₄ will require 2 V of O₂
C₂H₄ + 3O₂ = 2CO₂ + 2H₂O
5 - V 3( 5 - V )
5 - V vol of C₂H₄ will require 3 ( 5 - V ) vol of oxygen .
Total oxygen required = 2 V + 3 ( 5 - V )
2 V + 3 ( 5 - V ) = 13.2
2 V + 15 - 3V = 13.2
V = 1.8 ml
vol of CH₄ = 1.8
vol of C₂H₄ = 5 - 1.8 = 3.2 ml.
What is the molarity of chloride ion in a solution made by dissolving 1.300g of aluminumchloride in a total volume of 500.0mL?
Answer:
0.0582 M
Explanation:
The following data were obtained from the question:
Mass of AlCl3 = 1.3 g
Volume of water = 500 mL
Molarity of chloride ion (Cl¯) =?
Next, we shall determine the number of mole in 1.3 g of AlCl3. This can be obtained as follow:
Mass of AlCl3 = 1.3 g
Molar mass of AlCl3 = 27 + (35.5×3)
= 27 + 106.5
= 133.5 g/mol
Mole of AlCl3 =?
Mole = mass /molar mass
Mole of AlCl3 = 1.3/133.5
Mole of AlCl3 = 0.0097 mole
Next, we shall convert 500 mL to litres (L). This can be obtained as follow:
1000 mL = 1 L
Therefore,
500 mL = 500 mL × 1 L / 1000 mL
500 mL = 0.5 L
Thus, 500 mL is equivalent to 0.5 L.
Next, we shall determine the molarity of the AlCl3 solution. This can be obtained as follow:
Mole of AlCl3 = 0.0097 mole
Volume of water = 0.5 L
Molarity of AlCl3 =?
Molarity = mole /Volume
Molarity of AlCl3 = 0.0097 / 0.5
Molarity of AlCl3 = 0.0194 M
Next, we shall write the dissociation equation of AlCl3 in solution. This is illustrated below:
AlCl3 (aq) —> Al³⁺ (aq) + 3Cl¯ (aq)
From the balanced equation above,
1 mole of AlCl3 produced 3 moles of Cl¯.
Finally, we shall determine the molarity of the chloride ion Cl¯ in the solution as follow:
From the balanced equation above,
1 mole of AlCl3 produced 3 moles of Cl¯.
Therefore, 0.0194 M AlCl3 will produce = 0.0194 × 3 = 0.0582 M Cl¯.
Thus, the molarity of the chloride ion, Cl¯ in the solution is 0.0582 M.
Which of the following gives a buffer solution when equal volumes of the two solutions are mixed?a. 0.20 MHF and 0.10 MNaOH.b. 0.10 MHF and 0.10 MNaOH.c. 0.10 MHF and 0.10 MNaF.d. 0.10 MHCl and 0.20 MNaF.
Answer:
a. 0.20 M HF and 0.10 M NaOH.
c. 0.10 M HF and 0.10 M NaF
d. 0.10 M HCl and 0.20 M NaF.
Explanation:
A buffer solution consists of a weak acid and its conjugate base, or of a weak base and its conjugate acid.
In this case, HF is the weak acid and F⁻ is its conjugate base.
Let's go case-by-case:
a. 0.20 M HF and 0.10 M NaOH.
Some -but not all- HF will react and produce F⁻, leaving a buffer solution.b. 0.10 M HF and 0.10 M NaOH.
All HF will react, not a buffer solution.c. 0.10 M HF and 0.10 M NaF.
There's no reaction, and both HF and F⁻ are directly added, it is a buffer solution.d. 0.10 M HCl and 0.20 M NaF.
Some F⁻ will react and produce HF, leaving a buffer solution.The correct answers are A), C) and D).
in order to produce an electric current in a coil of wire , a magnet field through the coil must be
Answer:
moving
Explanation:
In order to produce an electric current in a coil of wire, a magnet field through the coil must be moving.
What is electromagnetic induction?Electromagnetic induction is a process in which electric field is produced due to the change in the value of magnetic field.
So, for the production of an electric current in a coil of wire, a magnet field should be moving through the coil of wire. Process of this electromegnetism get clear through the below attached image.
Hence magnetic field should be moving.
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A 100.0 mL sample of 0.18 M HClO4 (Strong acid) is titrated with 0.27 M LiOH. Determine the pH of the solution after the addition of 75.0 mL of LiOH
Answer:
pH = 12.11
Explanation:
Hello!
In this case, since the chemical reaction between perchloric acid and lithium hydroxide is:
[tex]HClO_4+LiOH\rightarrow LiClO_4+H_2O[/tex]
Whereas the mole ratio between the acid and base is 1:1, it means they react in the same proportion. In such a way, given the volume and concentration of acid, we compute the moles:
[tex]n_{acid}=0.1000L*0.18mol/L=0.018mol[/tex]
Now, the moles of base that reacted:
[tex]n_{base}=0.075L*0.27mol/L=0.02025mol[/tex]
Thus, since there is an excess of lithium hydroxide of:
[tex]n_{LiOH}^{remaining}=0.02025-0.018=0.00225mol[/tex]
We compute the new concentration considering the total final volume of 175.0 mL:
[tex][LiOH]=\frac{0.00225mol}{0.1750L}=0.013M[/tex]
Now, since there is a strong base remaining in solution, we compute its pOH first:
[tex]pOH=-log([OH^-])=-log(0.013M)=1.89[/tex]
Because LiOH is fully ionized to Li⁺ and OH⁻ ions. Therefore the pH is:
[tex]pH+pOH=14\\\\pH=14-pOH=14-1.89\\\\pH=12.11[/tex]
Best regards!
Thermal expansion happens when
Answer:
the size of an object changes with a change in temperature.
Explanation:
