Answer:
protons: 8
neutrons: 9
Explanation:
the atomic number tells you how many protons are in a element. The mass is the number of protons + neutrons.
17 - 8 = 9 neutrons
There are 8 protons and 9 neutrons in the nucleus of the oxygen atom.
What is the atomic number and mass number of an atom?The atomic number of an atom is the number of protons in atom of an element.
It can also be defined as the number of electrons in a neutral atom of an element.
The mass number is the number of protons and neutrons in the nucleus of an atom of an element.
The proton number of the oxygen atom is 8
The neutron number is 17 - 8 = 9
Therefore, in the nucleus of the oxygen atom, there are 8 protons and 9 neutrons.
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How can you figure out the properties of a star?
Answer:
Measuring distances to stars through stellar parallax. Measuring distances to stars through the moving cluster method. Astronomers measure the temperature of a star by looking at the star's color and its spectrum. The apparent brightness of a star tells how bright it seems to us
Explanation:
Answer:
Analyze the Characteristics of a Star
Explanation:
Surface Temperature
First, you want to determine the color of the star - this can determine the heat and age of the star.
Second, you want to measure the spectrum and get the spectral type.
Chemical Composition
Determine which lines are present in the spectrum.
Luminosity
Measure the apparent brightness and compensate for distance
Radical Velocity
Measure the Doppler shift in the spectrum.
Rotation
Measure the width of spectral lines.
Mass
Measure the period and radial velocity curves of spectroscopic binary stars.
Diameter
1. Measure the way a star’s light is blocked by the Moon.
2. Measure the light curves and Doppler shifts for eclipsing binary stars.
What is the pH of a solution that has [H+] of .0042M?
Answer:
pH = 2.4
Explanation:
pH is defined as the negative log of the hydronium concentration.
Thus, we can plug in the given hydronium concentration:
pH = -log[H⁺] = -log[0.0042] = 2.4 (two significant figures)
The pH of the solution is 2.4.
P.S: Although I referred to [H⁺] as hydronium concentration, it is more accurate to express it as [H₃O⁺], though they are interchangeable and means the same thing.
I also really need help on this one.
Answer:
I would say ether the first one or the third one because on those questions you always want to choose the one that gives the most information or sound more believe
Hope this helped
please help me do it dont worry the answers are their just put them in theright place
The natural pH of rain water is
acidic
neutral
basic
Please help
Answer:
between 5.0 and 5.5
Explanation:
acidic
Question is in the photo
Answer:
c?
Explanation:
_____________ is the force or pressure of electricity and is compared to the amount of water pressure in a hose.
Answer:
Voltage.
Explanation:
Voltage is the force or pressure of electricity and is compared to the amount of water pressure in a hose.
Answer:
Voltage is the force or pressure of electricity and is compared to the amount of water pressure in a hose.
C + 2ZnO → CO2 + 2zn
How many grams of
carbon dioxide will be
produced if 135 grams
of ZnO is completely
reacted?
Answer:
36.5 g CO2
Explanation:
First, Write a Balanced Equation
C + 2 ZnO → CO2 + 2 Zn
Useful Information,
MW of ZnO = 81.41 g
MW of CO2 = 44.01 g
135 g ZnO x (1 mol ZnO / 81.41 g ZnO) x (1 mol CO2/2 mol ZnO) x ( 44.01 g CO2 / 1 mol CO2 ) = 36.5 g CO2
Which term goes hand in hand with biodiversity?
(A.) sustainability
(B.) competition
(C.) survival
(D.) homeostasis
if i want to make 14 moles of potassium chloride, how many grams of potassium do i need? Show all work. Make sure to include unit and substance
Answer:
The answer is 0.013413582325191. i assume you are converting between moles Potassium Chloride and gram. The molecular formula for Potassium Chloride is KCl. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Potassium Chloride, or 74.5513 grams.
Explanation:
What volume (in liters, at 253 K and 6.54 atm) of chlorine gas is required to react with 7.89 g of P? 2P(s) + 5Cl2(g) → 5PCl5(s)
Answer:
7.89 grams of phosphorus reacts with 45.15 grams of chlorine
Explanation:
For reacting with 2 mole of P react with 5 mole of Cl2 gas
Molecular weight of phosphorus = 30.97
Molecular weight of 2 mole of phosphorus = 2 * 30.97 = 61.94 grams
Molecular weight of Chlorine molecule = 70.9 grams
Weight of 5 moles of Chlorine molecule = 5 * 70.9 grams = 354.5 grams
61.94 grams of phosphorus reacts with 354.5 grams of chlorine
7.89 grams of phosphorus reacts with 354.5/61.94 * 7.89 grams of chlorine
7.89 grams of phosphorus reacts with 45.15 grams of chlorine
What is the heat capacity of a substance in which 1050 grams will rise in temperature from 30.4°C to 25.7°C when it absorbs 2880 joules of heat?
Answer:
0.584 J/g°C
Explanation:
Using the formula as follows;
Q = m × c × ∆T
Where;
Q = amount of heat (joules)
m = mass of substance (g)
c = specific heat capacity (J/g°C)
∆T = change in temperature (°C)
According to the information in this question;
mass of substance (m) = 1050g
Initial temperature = 25.7°C
Final temperature = 30.4°C
amount of heat (Q) = 2880J
change in temperature (∆T) = (30.4°C - 25.7°C) = 4.7°C
Using Q = m.c.∆T
c = Q ÷ m∆T
c = 2880 ÷ (1050 × 4.7)
c = 2880 ÷ 4935
c = 0.584 J/g°C
The specific capacity of the substance is 0.584 J/g°C.
Name the following alkyne:
CH3CH2C = C - CI
Answer:
The answer was be 1-chloro-1-butyne
Explanation:
In other words the answer is option letter A
You welcome have a nice day.
The name of the given alkyne, CH₃CH₂C = C – CI is 1 chloro 1 butyne.
The correct option is A.
What are alkynes?Alkynes are unsaturated hydrocarbons, that have carbon-carbon triple bonds.
Chlorobutyne is colorless and is liquid at room temperature and pressure.
It is polar, but still slightly soluble in water.
Thus, the correct option is A, 1 chloro 1 butyne.
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1.Si dos átomos tienen el mismo "Z" pero diferente "A" se trata de : a) Nucleones b) Isótopos c) Mesones
Answer:
Si dos átomos tienen el mismo "Z" pero diferente "A" se trata de Isótopos.
Explanation:
Cada elemento químico se caracteriza por el número de protones de su núcleo, que se denomina número atómico Z. Pero en el núcleo de cada elemento también es posible encontrar neutrones, cuyo número puede variar. La masa atómica (A) se obtiene sumando el número de protones y de neutrones de un núcleo determinado.
Un mismo elemento químico puede estar constituido por átomos diferentes, es decir, sus números atómicos son iguales, pero el número másico es distinto. Estos átomos se denominan isótopos del elemento. Si a un átomo se le añade un neutrón, se convierte en un isótopo de ese elemento químico. En otras palabras, se denomina isótopos a los átomos de un mismo elemento, cuyos núcleos tienen una cantidad diferente de neutrones.
Los isótopos de un elemento tienen las mismas propiedades químicas, pero difieren algo en sus propiedades físicas.
Entonces, si dos átomos tienen el mismo "Z" pero diferente "A" se trata de Isótopos.
What is the pow of a solution that has a hydroxide ion concentration of 4.82 x 10-6 M?
Answer:
pOH = 5.32
Explanation:
What is the pOH...
The pOH of a solution is defined as:
-log [OH⁻] The -log of hydroxide ion concentration in molarity units
It is used to find pH of a solution because: pH = 14-pOH
Thus, the pOH of the solution of the problem is:
pOH = -log [OH⁻] = -log [4.82x10⁻⁶M]
pOH = 5.32
Read the sentence from "Black Hole Beginnings."
As more stuff gathers, its combined gravitation grows stronger.
What question should readers ask to determine the effect in the sentence?
How much stuff is combined?
Where does the stuff gather?
Why does the gravitation grow stronger?
What happens when more stuff gathers?
Answer: the answer Is d
Explanation:
The question that readers should ask to determine the effect in the sentence is that what happens when more stuff gathers?
What is a sentence?Sentence is defined as a group of words, usually containing a subject and a verb, expressing a statement, question, instruction, or exclamation, and, when written, starting with a capital letter and ending with a period or other mark, example, Your sentences are too long and complicated.Many sentences written together form a paragraph.
In law, a punishment is which is given by a law court to a person or organization that is guilty of a crime. It is a grammatical unit of one or more words that expresses an independent statement, question, request, command, exclamation, etc.
In print or writing, a sentence typically begins with a capital letter and ends with appropriate punctuation; in speech it displays recognizable, communicative intonation patterns and is often marked by preceding and following pauses.
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How many moles are present in 5.24g of H2O?
Answer:
The answer is 18.01528.
We assume you are converting between grams H2O and mole.
Explanation:
What fossil helped support Wegener's hypothesis of continental drift?
A. Gondwanaland
B. Kannemeyerid
C. Mesosaurus
D. Glossopteris
Answer:
Glossopteris
Explanation:
Glossopteris is a fossil fern that helped support Wegener's hypothesis.
Hope this helps! Have a great day!
Can someone help me out with these chemistry balancing equations questions?
Answer:
C4H6O3 + H2O → 2C2H4O2
C2H4 + 3O2 → 2CO2 + 2H2O
2C4H10 + 13O2 → 8CO2 + 10(H2O)
Explanation:
Which gas law would apply to the following scenario.
A family is going to a party in the mountains (no change in temperature). It was their job to bring balloons. By the time they arrived 2 of the balloons had
popped,
Gay-Lussac's Law
Boyle's Law
Charles Law
Avogadro's Law
What is the most general name for any single type of matter that is made from a specific arrangement of atoms?
A.
substance
B.
solid
C.
molecule
D.
element
Answer:
The answer is C. substance
Explanation:
I did this on study island and got it right, hope you enjoy.
A student adds 5400.0mL of 0.15M NaOH to 201.2mL of 4.0M NaOH. What is the final [NaOH]?
Answer:
0.287 M
Explanation:
Multiply the concentration of each solution by the volume of each (in liters) to get the moles of NaOH in that solution.
0.15 M • 5.4000 L = 0.81 mol NaOH
4.0 M • 0.2012 L = 0.80 mol NaOH
Add the mol of NaOH together to get the total --> 0.81 + 0.80 = 1.61 mol NaOH
Divide by the total volume of solution (5400.0 mL + 201.2 mL = 5,601.2 mL = 5.6012 L)
1.61 mol / 5.6012 L = 0.287 M NaOH
A cough sytup contains 0.5M dextromethophan. How many moles of the cough supressant are in 21.3mL of the cough syrup?
Answer:
0.0107 mol
Explanation:
Multiply concentration by volume (in liters) to get moles.
0.5 M • 0.0213 L = 0.0107 mol
How many molecules are in 3 moles of NaCl?
Answer:
Given : No. Of moles = 1.5
To calculate : no. Of molecules =N
We know that moles = N / 6.022 x 10²³
Therefore, 1.5 x 6.022 x 10²³ = N
Hence N = 9.0330x 10²³ molecules
How many atoms are present in 1.8 mol of Ca? Also, how many moles are in 3.4 * 10²⁶ molecules of H2O?
Answer: is this what your looking for?
Explanation: One mole of anything, no matter what the element is, is Avogadro's number, which is 6.02 * 10^23 atoms.
One mole of Calcium is equal to it's atomic weight in grams :
1 mole Ca = 40.08 g = 6.02 * 10^23 atoms
There is a 1000mg in a gram. 1000mg * 40.08g =
=40,080mg of Ca per mole
If you have 8.6mg of Ca that is 8.6mg / 40,080mg = .00021457 of a mole of calcium
so just multiply that by Avogadro's number to give you number of atoms:
.00021457 * 6.02 * 10^23 atoms = 1.292 * 10^20 atoms of Ca
A mole is the amount (10) of material containing [tex]6.02214 * 10^{23}[/tex] particles.
1 mol = [tex]6.02214 * 10^{23}[/tex] particles. This number is also called Avogadro's number
One mole of Calcium is equal to it's atomic weight in grams :
[tex]\text{1 mole Ca} = 40.08 g = 6.02 * 10^{23} \text{ atoms}[/tex]
a) 1g=1000mg
[tex]1000\text{ mg} * 40.08g = 40,080 \text{ mg of Ca per mole}[/tex]
If you have 8.6mg of Ca that is
[tex]\frac{8.6mg}{40,080mg} =0 .00021457 \text{ mole of Ca}[/tex]
In terms of Avogadro number:
[tex]0.00021457 * 6.02 * 10^{23} atoms = 1.292 * 10^{20} \text{ atoms of Ca}[/tex]
b) The number of moles of H₂O will be:
[tex]3.4*10^{26}*6.022*10^{23}\\\\20.47*10^{49} \text{moles}[/tex]
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Please help me ........
What is happening when an oxygen molecule is formed from two separate oxygen atoms?
Exothermic reactions have _____ net bond energy.
A) positive
B) negative
C) neutral
Question 33 of 33
What is the formula for copper(II) chloride?
O A. Cuci
B. Cuci
O c. 2CUCI
O D. CuCl2
Answer:
CuCI2 is the answer.......
Construct an explanation for why the physical properties of the inner core, outer core, and lower mantle are essential for the development of Earth's magnetic field.
Answer:
The hot temperature of inner core and outer core is responsible for the production of magnetic field.
Explanation:
The physical properties of the inner core, outer core, and lower mantle are essential for the development of Earth's magnetic field because the very high temperature of inner core is responsible for the formation of magnetic field. If the inner core is not very hot so the magnetic field will not be generated and our earth's atmosphere will not be save from the solar wind. It can be blown away by the solar wind if this magnetic field is not present so we can conclude that the physical properties of inner core and outer core is important for the production of magnetic field.