Each of the models shown represents a magnesium atom. Which models show the same isotope of magnesium? P, Q, and R
P and Q
P and R
Q and R
Answers
Answer:
P and Q
Q and R
Explanation:
To begin, we must bear in mind the meaning of isotope.
Isotopes are atoms having the same atomic number (i.e proton) but different mass number due to the difference in the neutron number present in the atoms involved.
Thus, we shall write out the number of protons, neutrons and electrons present in the model given above. This is given:
Model P:
Proton = 12
Neutron = 13
Electron = 13
Model Q:
Proton = 12
Neutron = 12
Electron = 13
Model R:
Proton = 12
Neutron = 13
Electron = 12
From the above data, we can say that:
1. P and Q are isotope since they have different Neutron number.
2. P and R are not isotope since they have the same Neutron number.
3. Q and R are isotope since they have different Neutron number.
Related Questions
An element is determined by the number of
Answers
Answer:
The chemical element of an atom is determined by the number of protons, or the atomic number, Z, of the nucleus. The element oxygen has an atomic number Z=8, while carbon has Z=6.
Explanation:
Answer:
The number of protons determines which kind of element an atom is. If an atom has 8 protons, we can determine this element is oxygen.
Explanation:
In the nucleus of an atom, there are protons and neutrons. Protons have a positive charge and neutrons have a neutral charge. All atoms have at least one proton that determines its atomic number.
CALCULATE THE MOLES IN 2.17 X10^23 MOLECULES OF FLUORINE
Answers
Answer:
0.36 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{2.17 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{2.17}{6.02} \\ = 0.360465...[/tex]
We have the final answer as
0.36 molesHope this helps you
Why are fossils
important in the
development of the
geologic time scale?
Answers
plz help me asap and dont make it more then 4 sentences or my teacher will know it was not me
y’all I’m tryna get you some BRAINLIEST POINTS!!!! So answer this simple question.
Can someone write 3 complex sentences i really need some help thank you!!!:)
Answers
Explanation:
This Theory proves that every Organism is made of one cell.
This also explained spread of cells like that of cancer.
this also explains how organisms create and die.
it explained the why organisms of same breed are alike or similar
orang juice a mixture?why?
Answers
Answer:
mixture, because it is made of more than 1 ingredient.
Calculate the mass of 120 cc of nitrogen at STP.How many
numbers of molecules are present in it?
Answers
2.67 × 10^19
Explaination:
The volume of the gas is 1c.c = 10^ - 3L
∴ Number of moles of the gas is=22.4 × 10^-3
Now,
Number of molecules = n × 6.022 × 10^23
∴ Number of Nitrogen Molecules
= 10^-3/22.4 × 6.023 × 10^23
= 2.67 × 10^19
Answer:
6.02 x 10²⁰ molecules
Explanation:
Given parameters:
Volume of nitrogen = 120cm³
Unknown:
Mass of Nitrogen = ?
Number of molecules present in it = ?
Solution:
At STP;
1 mole of a substance contains 22.4dm³ particles
100cm³ = 1dm³
24cm³ will give 0.024dm³
22.4dm³ of particles are in 1 mole of substances at STP
0.024dm³ of particles will contain [tex]\frac{0.024}{24}[/tex] = 0.001mole
Mass of Nitrogen = Number of moles x molar mass
molar mass of nitrogen = 14g/mol
Mass of nitrogen = 0.001 x 14 = 0.014g
Number of molecules present;
1 mole of a substance contains 6.02 x 10²³ molecules
0.001 mole of Nitrogen will contain 0.001 x 6.02 x 10²³ = 6.02 x 10²⁰
6.02 x 10²⁰ molecules
The formula for bismuth(III) arsenide is..?
Answers
Answer:
BiAs
Explanation:
What best describes how the testing of the initial version and the testing of the beta version fit into the four stages of the process of technological design
Answers
Answer:
C. The initial version is tested during the third stage to determine what needs to be improved, and the beta version is tested during the fourth stage to ensure that criteria are met.
Explanation:
Edge 2021
The Testing of the initial version is carried out in the third stage to determine what needs to be improved, while the testing of the beta version is carried out during the fourth stage to ensure that all necessary criteria are met.
The process of technological design involves several distinctive processes which can be broken down into four stages.
The four stages involved in the process of technological design are :
Identify a need : during this process the engineer identifies a problem that needs to be resolved design a solution : an initial design is created to provide a solution to the problem identified in stage 1Implement the solution : The design is tested and implemented if successfulevaluate the solution : In this stage the result from the solution ( beta version ) is subjected to ensure that all criteria are methence the testing of the initial version is to determine what needs improvement while the testing of the beta version is to ensure all criteria are met
learn more here: https://brainly.com/question/23367920
Which of the following is the correct definition of chemical energy?
A.
energy stored in chemical bonds of molecules
B.
energy produced from the splitting of atoms
C.
energy of an object due to the random motion of its atoms and molecules
D.
energy an object has because of its motion or position
PLSHEL HELP DUE TODAY
Answers
Answer:
A
Explanation:
How does the skin help regulate body temperature?
HELP FAST
Answers
Answer:
1. The body's immense blood supply (when blood vessels dilate or become larger heat loss occurs) When the blood vessels constrict it holds in heat
2. The skins blood supply also helps maintain body temperature (helps maintain homeostasis which is the "normal" state of our body)
3. Humidity in the air effects thermoregulation (heat regulation in the body) by limiting sweat evaporation (usually sweat evaporates into the environment when the humidity is low because the air has low "water levels" per say while you have high "water levels" because of your sweat
Use the following diagram to answer question . A science class built the models shown below to conduct a study. Students poured the same amount of water over both models. They observed that most of the dirt emptied out of the container in Model A and that a small amount of dirt emptied out of the container in Model B. What were the students MOST LIKELY studying?Immersive Reader
The rock cycle
Earthquakes
Erosion
Volcanic eruptions
Answers
Answer:D erosion
Explanation:
The question tells you how the students watched the dirt move so it makes sense that its erosion
How many hydrogen (H) atoms are on the reactants side
Answers
Answer:
two hydrogen atoms
Explanation:
Which of the following has the largest electronegativity? AI, Cu, S, or O?
Answers
Answer:
O(Oxygen)
Explanation:
Oxygen or O among the given options has the highest electronegativity of 3.5 as compared to 2.4 of sulfur. Thus, there is a lesser attraction in the bonds of Sulfur. The other two elements Al(Aluminium) and Cu are less electronegative than Sulfur and Oxygen as they are metals and possess electropositivity while the latter displays more electronegativity due to being non-metals. Hence, Oxygen is the answer.
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Pure substances made of two or more kinds of atoms bound together
Compound
Mixture
Solution
Salt
Answers
HEMP ME ITS DUE BY MIDNIGHT
Answers
Answer:
Explanation:
Option B is the correct answer
In the chemical reaction below, what Is the product? C+o2 -> Co2
Answers
Answer:
CO₂
Explanation:
The product of the reaction is CO₂.
In a chemical reaction, the product is the substance usually found on the right hand side of the expression.
Reaction equation is given as;
C + O₂ → CO₂
In this reaction, C and O₂ are the reactants
CO₂ is the product of the reaction.
This reaction is called a combination reaction in which two species combines to give a product.When a new synthetic method is developed, it is applied to a series of compounds to explore its utility. 4-Fluorophenylacetonitrile was used as a substrate in a synthetic methodology research paper. Provide a synthesis for 4-fluorophenylacetonitrile using an SN2 reaction. Begin with a retrosynthesis of the target molecule. identify all
Answers
Answer:
See explanation
Explanation:
Since the -CH3CN and the -F are in 1,4 position, then the synthesis started with flourobenzene. This has to be because -F is ortho-para directing in nucleophilic substitution.
The next step is the Friedel craft alkylation of the substrate. The alkyl group is directed to the para position by the -F.
Bromination using NBS yields an alkyl bromide that undergoes SN2 substitution to yield the target compound.
Someone help me pls!
Answers
Answer:
thermal energy from the sun
Explanation:
because the sun have more potencia
What are the characteristics of Venus
Answers
Answer:
Venus is very hot because of the clouds that surround it. It is roughly the same size as Earth, it is just a little smaller. Venus is a rocky planet and has a lot of volcanoes.
That's all I know, you might have to research it. :/
3+
4N
what element is this?
Answers
Answer:
Selenium
Explanation:
PLEASE HELP ASAP!!!! I give extra points to those who help me!
Explain how you can estimate the number of neutrons in the atoms of an element.
Answers
Answer:
to determine the number of neutrons in atom, we only have to subtract the number of protons from the mass number. the nucleus of an atom is composed of protons and neutrons. And the number of particles present in the nucleus is referred as mass number (Also, called as atomic mass).
Explanation:
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If a wave is traveling at a steady speed and its frequency is
doubled, what happens to the wavelength of that wave?
Answers
Answer:
If the frequency is doubled, the wavelength is only half as long.
Explanation:
Wave speed equals frequency*wavelength. So doubling the frequency must halve the wavelength in order for wave speed to remain the same.
Which of the following covalent bonds is the strongest?
a)
quadruple covalent bond
b)
triple covalent bond
c)
double covalent bond
d)
single covalent bond
Answers
Answer:
a) quadruple covalent bond
Explanation:
Quadruple covalent bonds are the strongest covalent bonds. The more the number of bonding pairs, the stronger the bond becomes.
A covalent bond is formed by sharing of electrons between two species. They are usually between compound with similar electronegativities. The number of bonds between the atom determines the bond strength.Single < double < triple < quadruple covalent bonds.
What is the momentum of a particle that has a mass of 0.00001346 Kg and moves with a velocity of 790,204,000 m/s?
Answers
Answer:
10636.15 kgm/sExplanation:
The momentum of an object can be found by using the formula
momentum = mass × velocity
From the question we have
momentum = 0.00001346 * 790204000
= 10636.14584
We have the final answer as
10,636.15 kgm/sHope this helps you
What is one long-lasting climate change?
Answers
Answer:
Scientists have predicted that long-term effects of climate change will include a decrease in sea ice and an increase in permafrost thawing, an increase in heat waves and heavy precipitation, and decreased water resources in semi-arid regions
Explanation:
What is a vapor?
O A. A substance that has a much higher melting point and boiling
point than other similar substances
O B. A substance that is always in the solid or liquid phase at room
temperature
C. A substance that is in the gas phase at a temperature at which it
would normally be a solid or liquid
O D. A substance that forms a gas, but only at very high temperatures
Answers
Answer:
in physics, a vapor or vapour is a substance in the gas phase at a temperature lower than its critical temperature, which means that the vapor can be condensed to a liquid by increasing the pressure on it without reducing the temperature. A vapor is different from an aerosol.
Explanation:
which solution below most likely shows a vivid color?
potassium chloride
nickel chloride
hydrogen chloride
lithium chloride
Answers
Answer:
B. Nickel Chloride
Explanation:
Mark as Brainliest!!! Hope this helps:)
Answer:
B. Nickel chloride
Explanation:
did the assignment on edge
Which of the elements below will form an anion?
B (Boron)
CI (Chlorine)
Ca (Calcium)
Fe (Iron)
Answers
Answer:
Which of the elements below will form an anion?
CI (Chlorine)
Explanation: Chlorine generally behaves as an anion having an oxidation state -1
In your own words, describe the purpose of using a chemical equation.
PLEASEEEE HURRY
Answers
Answer:
Hey mate, here is your answer. Hope it helps you.
Explanation:
To show how substances in a chemical reaction interact and to keep track of all elements and the number of atoms in each element on each side of the equation.The purpose of writing a balanced chemical equation is to know: the reactants (starting material) and products (end results) that occur. the ratios in which they react so you can calculate how much reactants you need and how much products can be formed.
Answer:
Sample Response: Chemical equations show how chemicals interact when a reaction occurs. They use symbols and formulas to show the chemical reaction so that chemical names do not need to be written out. They also help keep track of all elements and the number of atoms of each element on each side of the equation.
Explanation:
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QUESTION 8: When would acceleration increase most? *
2 points
Rolling along a flat plane
Rolling down a steep hill
Braking to a stop
Rolling up a gently sloping hill
Answers
Answer:
Rolling down a steep hill
Explanation:
