A magnesium ion, Mg2+, is formed from a magnesium atom, Mg.
Which row about the numbers of protons and neutrons in the magnesium ion and in the magnesium atom is correct?
Why the answer for this question is B.
Pls help to explain it. Thank you.
Answers
Answer:
The correct row is B.
Explanation:
The formation of the magnesium ion, Mg²⁺, comes from the removal of 2 electrons from the valence shell of the magnesium atom. Since the remotion is of electrons, the nucleus of the atom remains the same, so the number of protons and the number of neutrons does not change.
If the number of proton change, then the atom also change, since the identity of an atom is related to the atomic number which is the same to the proton number.
Now, if the number of neutrons changes, then we would be in the presence of an isotope of the magnesium atom.
Therefore, the correct row is B.
I hope it helps you!
Related Questions
What is the pH of a solution with [H+] concentration of 1.86 x 10-5?
a.5.37 x 10-10
b.9.3
c.4.7
d.1.86 x 10-5
Answers
Answer:
4.7Explanation:
The pH of a solution can be found by using the formula
[tex]pH = - log [ {H}^{+} ][/tex]
From the question we have
[tex]ph = - log(1.8 \times {10}^{ - 5} ) \\ = 4.7447[/tex]
We have the final answer as
4.7Hope this helps you
2 NH3 + 3 CuO --> 3 Cu + N2 + 3 H2O
In the above equation, how many moles of N2 can be made when 113.6 grams of CuO are consumed?
Round your answer to the nearest tenth. If your answer is a whole number like 4, report the answer as 4.0
Use the following molar masses. If you do not use these masses, the computer will mark your answer incorrect. :
Element Molar Mass
Hydrogen
1
Nitrogen
14
Copper
63.5
Oxygen
16
Answers
Answer: 0.5 moles of [tex]N_2[/tex] are produced in the reaction
Explanation:
The number of moles is defined as the ratio of the mass of a substance to its molar mass.
The equation used is:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] ......(1)
Given mass of [tex]CuO[/tex] = 113.6 g
Molar mass of [tex]CuO[/tex] = 79.5 g/mol
Plugging values in equation 1:
[tex]\text{Moles of CuO}=\frac{113.6g}{79.5g/mol}=1.43 mol[/tex]
For the given chemical reaction:
[tex]2NH_3+3CuO\rightarrow 3Cu+N_2+3H_2O[/tex]
By the stoichiometry of the reaction:
If 3 moles of [tex]CuO[/tex] produces 1 mole of [tex]N_2[/tex]
So, 1.43 moles of [tex]CuO[/tex] will produce = [tex]\frac{1}{3}\times 1.43=0.476=0.5mol[/tex] of [tex]N_2[/tex]
Hence, 0.5 moles of [tex]N_2[/tex] are produced in the reaction
4Fe (s) + 3 O2 (g) → 2 Fe2O3 (s)
A. What is the oxidation number for each item in this equation?
B. What is being oxidized?
C. What is being reduced?
D. What is the oxidizing agent?
E. What is the reducing agent?
Answers
Explanation:
The number acquired by an element after the lose or gain of an electron is called oxidation number.
For example, [tex]4Fe(s) + 3O_{2}(g) \rightarrow 2Fe_{2}O_{3}(s)[/tex]
Here, oxidation number of Fe(s) is 0 and Fe in [tex]Fe_{2}O_{3}[/tex] is +3.
Oxidation number of O in [tex]O_{2}(g)[/tex] is 0 as it is present in its elemental state.
The oxidation number of O in [tex]Fe_{2}O_{3}[/tex] is calculated as follows.
[tex]2(3) + 3x = 0\\6 + 3x = 0\\x = \frac{-6}{3}\\= -2[/tex]
Hence, oxidation number of O in [tex]Fe_{2}O_{3}[/tex] is -2.
The loss of electrons by an element or substance is called oxidation. Here, electrons are being lost by Fe(s) as an increase in oxidation state is occurring. So, Fe(s) is oxidized.The gain of electrons by an element or substance is called reduction. Here, electrons are being added to [tex]O_{2}[/tex] as a decrease in its oxidation state is occurring. So, [tex]O_{2}[/tex] is reduced.An element or compound which is being reduced is called oxidizing agent. Here, [tex]O_{2}[/tex] is the oxidizing agent.An element or compound which is being oxidized is called reducing agent. Here, Fe(s) is the reducing agent.PLEASE SOMEONE! The density of the acetic acid solution is 1.05 g/mL. Calculate the %(m/m) of the acetic acid solution (convert mol/L to %(m/m)).
CH3COOH(aq) + NaOH(aq) = CH3COOHNa(aq) + H2O(L)
Volume of CH3COOH = 0.1L
Titration Equation: CH3COOH(aq) + NaOH(aq) = CH3COOHNa(aq) + H2O(L)
Concentration of CH3COOH = 0.243 mol/L
Answers
Answer:
The Percentage concentration of acetic acid = 1.39 %
Explanation:
Density of acetic acid solution = 1.05 g/mL
Volume of acetic acid solution = 0.1 L = 100 mL
From the formula, Density = mass / volume; mass = density × volume
Mass of acetic acid solution = 1.05 g/mL × 100 mL = 105 g
Molar concentration of acetic acid solution = 0.243 mol/L
Molar mass of acetic acid, CH₃COOH = (12 × 2 + 1 ×4 + 16 ×2) = 60 g/mol
From the formula, mass concentration = molar concentration × molar mass
Mass concentration of acetic acid, CH₃COOH = 0.243 mol/L × 60 g/mol = 14.58 g/L
In one liter of acetic acid solution, there are 14.58 g of acetic acid. Therefore, in 0.1 L, there will be 14.58 × 0.1 = 1.458 g of acetic acid.
Percentage concentration of acetic acid = mass of acetic acid / mass of acetic acid solution × 100%
Percentage concentration of acetic acid = (1.458 / 105) × 100% = 1.39 %
The Percentage concentration of acetic acid = 1.39 %
What is the standard reduction potential, e, for the half-reaction Zn2+(aq) +2e → Zn(s)?
A. -0.76 V
B. -1.68 V
C. -2.37 v
D. -2.71 V
Answers
The standard reduction potential for the half-reaction Zn²⁺(aq) + ⁻2e → Zn(s) is -0.76 V; option A
What is standard reduction potential?
The standard reduction potential of a chemical species is the a measure of the potential of a given chemical species to be reduced rather than being oxidized.
This measurement is done under standard conditions of concentration, pressure and temperature.
The standard reduction potential for the half-reaction Zn²⁺(aq) + ⁻2e → Zn(s) is -0.76 V.
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How many total atoms are there in 60.3 g of carbon monoxide (CO)?
total atoms:
atoms
Answers
Explanation:
moles = mass/mr
=60.3/28
=2.15 moles
number of particles = moles × 6.02×10^23
= 2.15×6.02×10^23
= 1.29×10^24 atoms
CO=12+16=28
list three common examples of solute
Answers
Answer:
sugar, salt, oxygen
Explanation:
hope these work
Answer:
Examples of solutes include sugar, salt, oxygen, etc. There are numerous examples of solutions. For example, milk (solvent) and sugar (solute) make sweet milk. Air is made up of gases (oxygen, nitrogen, carbon dioxide, etc.).
Explanation:
PLEASE HELP : Arrange the following elements into a food chain: plants, snake, Sun, hawk, and mouse.
Answers
Answer:
Plants ➯ Mouse ➯ Snake ➯ Hawk ➯ Sun
Explanation:
In Order As A Food Chain
The elements are arranged into food chain like plants ⇒Mouse ⇒ Snake⇒ Hawk ⇒ Sun.
What is element?A substance that could not be further decomposed according to any chemical reaction is known as a chemical element.
What is food chain?
The flow of nutrients as well as energy through such an ecosystem is described by a food chain. Energy is first produced by plants at the most fundamental level, and then it is used by higher-level species like herbivores. Energy is then transmitted from one carnivore to the next when they eat the herbivores.
The elements are arranged into food chain like plants ⇒Mouse ⇒ Snake⇒ Hawk ⇒ Sun.
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In its aqueous solution, 32% of a substance dissociates to release hydroxide ions. Which of the following is true for the substance? (3 points)
It is a weak acid
It is a weak base.
It is a strong acid
It is a strong base.
*please only answer is you have the real answer bc I really need to bring up my grade*
Answers
Answer:
It is a weak base.
Explanation:
A base is a substance that releases hydroxide ion (OH-) when in an aqueous solution, according to Svante Arrhenius definition of a base. However, a base is said to be either strong or weak depending on it is able to dissociate.
A weak base is a base that does not completely dissociate into hydroxide ions in an aqueous solution while a strong base dissociates completely. According to this question, 32% of a basic substance ( because it can dissociate into OH-) dissociates to release hydroxide ions. This means that since it does not totally dissociate i.e. 100%, it is a WEAK BASE.
Answer:
It is a weak base.
Explanation:
Guy above me is right and I took the test :)
Which statement accurately describes how electrical power and voltage are
related?
A. Power decreases as voltage increases.
B. Power is always half the amount of voltage.
C. Power is always twice the amount of voltage.
D. Power increases as voltage increases.
Answers
Answer: B
Explanation:
According to Ohm's Law, the answer is B.
Ohm's Law states that power is equal to volume x current.
If volume x current equals power, that means they are both 50% of power.
Ohm's Law:
power = voltage x current
current = voltage x power
voltage = power x current
I hope this answer helped.
Power is always half the amount of voltage. Hence, option B is correct.
What is voltage?Voltage is the potential difference between two points in a circuit or the electromotive force in a given circuit and is expressed in volts (V).
Voltage is measured by a device called a voltmeter that is always connected in parallel with the current source.
When voltage is measured between two points on a wire in a circuit with zero or no resistance in between the two points then the voltage will be zero.
From the ohm's Law, voltage is given the product of resistance and current and thus if the resistance is zero then the voltage will be zero.
Ohm's Law states that power is equal to volume x current.
If volume x current equals power, that means they are both 50% of power.
Ohm's Law:
power = voltage x current
current = voltage x power
voltage = power x current
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How would it have been if particles of matter had no space?
Answers
Answer:
Matter is made of small particles of atoms or molecules. ... The particles in the solid are touching with very little space between them. The particles in a liquid usually are still touching but there are some spaces between them. The gas particles have big distances between them.
A. The sequence of bases in one DNA strand is given below. Identify the complementary sequence of bases
in the other strand of DNA.
1.
А A
с
T
С
T
G
C
с
А
T
Answers
Answer:
The complementary sequence of bases in the complementary strand of the given single DNA strand AACTCTGCCAT will be:
TTGAGACGGTA
Explanation:
The primary structure of DNA is a double-stranded helix of nucleotides linked to each other by phosphodiester linkages. The two strands of the DNA molecule is complementary to each other. While one strand is linked in the 3' to 5' direction, the other strand is linked in the 5' to 3' direction. The two strands are held together by hydrogen bonds between the nucleotides of the two strands and this is known as base pairing. In base pairing, adenine nucleotide, A, on one strand forms two hydrogen bonds with thymine nucleotdie, T, in the other strand. Also, guanine nucleotide, G, in one strand, forms three hydrogen bonds with cytidine nucleotide, C, in the complementary strand.
Therefore, once the nucleotide sequence of one DNA strand is known, the nucleotide sequence of the complementary strand can easily be deduced.
The complementary sequence of bases in the complementary strand of the given single DNA strand AACTCTGCCAT will be: TTGAGACGGTA
How many moles of aluminum oxide are produced when 6 moles of oxygen gas react?
4Al + 3O2 → 2Al2O3
Answers
Answer:
4 moles of aluminum and 6 moles of oxygen are produced
Use the activity series below to predict whether the following reactions will take place.
Answers
Answer:
first one is yes, second one is no
Explanation:
edge
Please somone help me with a chemistry question brainliest to whoever answers correctly and 20 points
Answers
Answer:
chlorine is larger so the symbol is <
Explanation:
If a speaker is moved from 2 feet away to 4 feet away, the volume of the sound will: half double quarter stay the same
Answers
Answer:
the volume of the sound will quarter
Explanation:
As you move far away from the source, the loudness of sound decreases. This is because as the distance from the source increases, the area it covers also increases thereby spreading the energy over a great area leading to lesser loudness and intensity.
As a result of this, sound intensity follows an inverse square law:
I ∝ 1/d²; where I is the intensity and d is the distance from source.
Therefore If a speaker is moved from 2 feet away to 4 feet away (increment of 2 feet), the volume of the sound would quarter (1/2² = 1/4)
Which electron in an atom (Z=17) is the most shielded from
nuclear charge?
A. an electron in the 2s
B. an electron in the 3p
C. an electron in the 3d
D. an electron in the 1s
Answers
Answer:
option no. C is correct
an electron in the 3d
Which mathematical statement shows the formula for weight?
Answers
Answer
(:
Weight is basically a measure of theme force of gravity pulling down on an object. It depends on the object's mass and the acceleration due to gravity, which is 9.8 m/s2 on Earth. The formula for calculating weight is F = m × 9.8 m/s2, where F is the object's weight in Newtons (N) and m is the object's mass in kilograms.
Explanation:
A set of charged plates is
separated by 8.08*10^-5 m. When
2.24*10^-9 C of charge is placed
on the plates, it creates a potential
difference of 855 V. What is the
area of the plates?
(The answer is _*10^-5 m^2. Just fill
in the number, not the power.)
Answers
Answer:
2.39×10¯⁵ m²
Explanation:
From the question given above, the following data were obtained:
Distance (d) = 8.08×10¯⁵ m
Charge (q) = 2.24×10¯⁹ C
Potential difference = 855 V
Area(A) =?
NOTE: Permittivity (ε₀) = 8.854×10¯¹² F/m
The area can be obtained as follow:
q = ε₀AV/d
2.24×10¯⁹ = 8.854×10¯¹² × A × 855 / 8.08×10¯⁵
2.24×10¯⁹ = 7.57×10¯⁹ × A / 8.08×10¯⁵
Cross multiply
7.75×10¯⁹ × A = 2.24×10¯⁹ × 8.08×10¯⁵
7.75×10¯⁹ × A = 1.81×10¯¹³
Divide both side by 7.75×10¯⁹
A = 1.81×10¯¹³ / 7.75×10¯⁹
A = 2.39×10¯⁵ m²
Thus, the area of the plate is 2.34×10¯⁵ m²
Answer:
2.39
Explanation:
potential (P) energy or kinetic (K) energy
Runners “on their marks” at the start line of a race _____
Answers
What element has 16 electrons, 16 protons, and 16 neutrons
Answers
Answer:
The element that has 16 electrons, 16 protons, and 16 neutrons is sulfur (S)
Explanation:
The atomic number tell you the number of protons.
The atomic configuration tell you the number of electrons.
The mass number minus the protons tell you the number of neutrons.
A 6.00 g sample of an optically pure compound was dissolved in 40.0 mL of CCl4. The observed rotation was +3.30 °, measured in a 10.0 cm (1.00 dm) polarimeter tube.
Answers
The question is incomplete, the complete question is:
If a 6.00 g sample of an optically pure compound was dissolved in 40.0 mL of [tex]CCl_4[/tex] and the observed rotation was +3.30°, measured in a 10.0 cm (1.00 dm) polarimeter tube, how would one determine the specific rotation of the pure compound?
Answer: The specific rotation of the pure compound is [tex]+22^o[/tex]
Explanation:
To calculate the specific rotation of a pure compound, we use the equation:
[tex][\alpha]=\frac{\alpha_{\text{observed}}}{C\times l\text{( in dm)}}[/tex]
where,
[tex][\alpha][/tex] = specific rotation of a pure compound
[tex]\alpha_{\text{observed}}[/tex] = observed rotation of the compound = [ex]+3.30^o[/tex]
C = concentration in g/mL = 6.00 g/40 mL = 0.15 g/mL
l = path length = 1.00 dm
Putting values in above equation, we get:
[tex][\alpha]=\frac{+3.30^o}{0.15\times 1.0}[/tex]
[tex][\alpha]=+22^o[/tex]
Hence, the specific rotation of the pure compound is [tex]+22^o[/tex]
ANSWER THE QUESTION TO GET BRAINLIST
When sunlight travels from the vacuum of space into Earth's atmosphere it slowed down slightly. Explain why and name the light principle involved.
Answers
It is thought that global dimming is probably due to the increased presence of aerosol particles in Earth's atmosphere, caused by pollution, dust, or volcanic eruptions. Aerosols and other particulates absorb solar energy and reflect sunlight back into space. ... Water droplets in clouds coalesce around the particles.
Global Dimming
source:
wikipedia via gooogle snippet
how many moles are in 3.25188x10^24 molecules of CO2
Answers
Answer: C is right
Explanation: One mole is 6.022 x 10^23 molecules.
Dividing 3.25188 x 10^24 / 6.022 x 10^23 = 5.4 moles
.A volumetric pipette is used to measure 25.0cm3 of 2.0mol/dm3 aqueous sodium hydroxide into aconical flask.A burette is filled with dilute sulfuric acid. Write a balanced symbol equation for the reaction between these chemicals when we neutralise.
Answers
Answer:
A volumetric pipette is used to measure 25.0cm3 of 2.0mol/dm3 aqueous sodium hydroxide into aconical flask.
A burette is filled with dilute sulfuric acid.
Write a balanced symbol equation for the reaction between these chemicals when we neutralise.
Explanation:
The reactants of the given reaction are:
sodium hydroxide and dilute sulfuric acid.
The balanced chemical equation of the reaction is:
[tex]H_{2}SO_{4} (aq) + 2NaOH(aq) -> Na_{2} SO_{4} (aq)+ 2H_{2} O(l)[/tex]
Acid and base raect with each other and form salt and water.
This reaction is called a neutralization reaction.
PLEASE HELP !!!
Which of the following measurements is used to measure the enthalpy of combustion?
A. Measuring the change in temperature when two liquids are mixed.
B. None of these
C. Measuring the change in temperature of a beaker of water.
D. It cannot be measured, only calculated using the equation: q = mc∆T.
Answers
Explanation:
measuring the change of temperature when 2 liquids are mixed
URGENT !!!
Which of the following pairs lists a substance that can neutralize Ca(OH)2 and the salt that would be produced from the reaction? (3 points)
HCl and CaCl2
HClO and CaHClO
H2O and Ca(OH)3
H3PO4 and Ca(PO3)2
Answers
HCl and CaCl2
I took the test and it wright
The correct pair that lists a substance that can neutralize [tex]\rm Ca(OH)_2[/tex] and the salt that would be produced from the reaction is HCl and [tex]\rm CaCl_2[/tex].
A reaction is a process that involves the transformation of one or more substances into one or more different substances.
When HCl (hydrochloric acid) reacts with [tex]\rm Ca(OH)_2[/tex] (calcium hydroxide), they undergo a neutralization reaction. The HCl donates a hydrogen ion ([tex]\rm H^+[/tex]) to the [tex]\rm Ca(OH)_2[/tex], resulting in the formation of water ([tex]\rm H_2O[/tex]) and [tex]\rm CaCl_2[/tex] (calcium chloride).
The reaction can be represented as follows:
[tex]\rm 2HCl + Ca(OH)_2\rightarrow 2H_2O + CaCl_2[/tex]
Therefore, HCl is an acid that can neutralize [tex]\rm Ca(OH)_2[/tex] and the salt produced from this reaction is [tex]\rm CaCl_2[/tex].
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Write a nuclear equation for the beta decay of Promethium-165
Answers
Answer:
see your answer in pic
Explanation:
There can be emissions of radiations like gamma radiation. There can be emission of particles too like alpha particle. Therefore, the nuclear equation for the beta decay of Promethium-165 is
¹⁶⁵Pm[tex]\rightarrow[/tex]⁰e₋₁ + ₆₂Sm¹⁶⁵
What is nuclear decay?Nuclear decay is process in which the radioactive element releases particles or radiations. Alpha particles is ⁴₂He. Alpha particle is nothing but helium particle. The kinetics that is related to nuclear decay is of first order.
The nuclear equation for the beta decay of Promethium-165 is
¹⁶⁵Pm[tex]\rightarrow[/tex]⁰e₋₁ + ₆₂Sm¹⁶⁵
Beta decay of Promethium-165 is the emission of electron particle from the given isotope. the product is Samarium ₆₂Sm¹⁶⁵.
Therefore, the nuclear equation for the beta decay of Promethium-165 is
¹⁶⁵Pm[tex]\rightarrow[/tex]⁰e₋₁ + ₆₂Sm¹⁶⁵
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A water pipe bursting in the winter is a result of which type of weathering?
A. Biological
B. Freeze-thaw
C. Exfoliation
D. Chemical
Answers
Answer:
Freeze-thaw
Explanation:
Water expands slightly when it freezes to form ice. This is why water pipes sometimes burst in the winter. You might have seen a demonstration of this sort of thing - a jar filled to the brim with water eventually shatters after it is put into a freezer. The formation of ice can also break rocks.
Rank them from the smallest to the largest
Answers
electrons
protons
atom
compounds
mixtures