Answer: Option (b) is the correct answer.
Explanation:
Atomic number is the sum of only total number of protons present in an element. Whereas mass number or atomic mass is the sum of total number of both protons and neutrons present in an element.
For example, given atom has atomic number is 8. And, it is known that atomic mass of O is 16 g/mol.
Therefore, number of neutrons present in it will be calculated as follows.
Mass number = no. of protons + no. of neutrons
16 = 8 + no. of neutrons
no. of neutrons = 16 - 8
= 8
Hence, we can conclude that in the given isotope of oxygen-16 there are 8 protons and 8 neutrons.
EASY AND IMPORTANT What do you think is the most challenging aspect of using a microscope? What are the advantages and disadvantages of using a microscope to look at trace evidence?
The most challenging aspect is focusing the microscope.
Microscopes enables us to view objects that cannot be seen with the human eye alone.
A disadvantage is that not all types of evidence can be clearly seen.
What is a microscope?A microscope is an instrument that is used to view tiny and microscopic objects.
In using a microscope, the most challenging aspect is focusing the microscope.
An advantage of microscopes is that they enable us to view objects that cannot be seen with the human eye alone.
A disadvantage though is that not all evidence can be clearly seen.
In conclusion, a microscope helps one to view trace and tiny objects.
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Which changes are evidence of a chemical reaction? a beaker of water becomes hot to the touch upon?
Use ksp=4.87×10−17 to calculate the solubility of iron (ii) hydroxide in pure water in grams per 100.0 ml of solution. g
The solubility product constant is the equilibrium constant of a substance in an aqueous solution. The solubility of iron (ii) hydroxide is [tex]2.07 \times 10^{-5}\;\rm g.[/tex]
What is Ksp?Ksp is the solubility product constant, which is given as the product of the concentration of cation and anion dissociated in the aqueous solution.
Given,
Ksp = [tex]4.87 \times 10^{-17}[/tex]
Thus,
[tex]\begin{aligned}&= \rm [Fe^{2+}][OH^{-}]^{2} \\\\&= \rm (X)(2X)^{2} \\\\&= \rm 4X^{3}\end{aligned}[/tex]
The molarity can be calculated as:
[tex]\begin{aligned}\rm 4X^{3} =4.87 \times 10^{-17}\\\\\rm X= 2.30 \times 10^{-6}\;\rm M\end{aligned}[/tex]
The mass of iron (ii) hydroxide in 100 mL of water is calculated as:
[tex]\begin{aligned}2.30 \times 10^{-6} \;\rm mol/L &= 2.3 \times 10^{-5}\;\rm mole/100 mL\\\\&= 2.07 \times 10^{-5} \;\rm g\end{aligned}[/tex]
Therefore, the solubility of iron (ii) hydroxide is [tex]2.07 \times 10^{-5}\;\rm g.[/tex]
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PLEASE!! *MEASURING MATTER VOCAB MATCHING*
words:
1. matter
2. accuracy
3. precision
4. meniscus
5. volume
6. density
definitions:
- the mass of an object per unit volume
- anything that has mass and occupies space
- space occupied, measured in cubic units
- the degree to which a measurement can be replicated
- the curved top surface of a liquid column
- an indication of how close a measurement is to the correct result
MATCH THE WORDS TO THE DEFINITIONS PLEASE & THANK YOU!!
The words 'matter', 'accuracy', 'precision', 'meniscus', 'volume', and 'density' have been linked with their suitable definitions, clarifying their individual meanings.
Explanation:Here are the words matched to their definitions:
Matter: Anything that has mass and occupies space.Accuracy: An indication of how close a measurement is to the correct result.Precision: The degree to which a measurement can be replicated.Meniscus: The curved top surface of a liquid column.Volume: Space occupied, measured in cubic units.Density: The mass of an object per unit volume.Learn more about Vocabulary Matching here:https://brainly.com/question/29261631
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How much heat is absorbed by 15.5 g of water when its temperature is increased from 20.0°C to 50.0°C? The specific heat of water is 4.184 J/(g°C).,
Answer : The heat absorbed by the water is 19.4 kJ
Explanation :
Formula used :
[tex]Q=m\times c\times \Delta T[/tex]
or,
[tex]Q=m\times c\times (T_2-T_1)[/tex]
where,
Q = heat absorbed = ?
m = mass of water = 15.5 g
c = specific heat of water = [tex]4.184J/g^oC[/tex]
[tex]T_1[/tex] = initial temperature = [tex]20.0^oC[/tex]
[tex]T_2[/tex] = final temperature = [tex]50.0^oC[/tex]
Now put all the given value in the above formula, we get:
[tex]Q=15.5g\times 4.184J/g^oC\times (50.0-20.0)^oC[/tex]
[tex]Q=1945.56J=1.94\times 10^3J=1.94kJ[/tex]
Therefore, the heat absorbed by the water is 19.4 kJ
explain in terms of collision theory, how and why a reactions's rate changes as the reaction progresses
Explanation:
According to collision theory, more is the number of collisions occurring between the combining substances more will be the rate of reaction.
Factors that affect rate of a reaction are as follows.
Temperature - Increase in temperature leads to increase in kinetic energy of particles due to which there occurs more number of collisions between them. As a result, rate of reaction will increase leading to increase in rapid formation of products.
Surface area - More is the surface area of a substance, less will be the interaction between solute and solvent particles. And, when there occurs decrease in surface area then interaction between solute and solvent particles increases. This leads to increase in rate of reaction.
Concentration of reactants - More is the concentration of reactant molecules more is the availability of molecule interaction. As a result, more number of collisions occur leading to increase in rate of a reaction.
When the concentration of solute in a solid solution exceeds its solubility limit, a new solid solution or phase forms that has a composition distinctly different than the original solid solution?
When solute concentration exceeds the solubility limit in a solution, a supersaturated solution is created, which subsequently initiates precipitation in order to achieve equilibrium. This results in the formation of a new solid phase that is distinct from the original solution.
Explanation:The concept you're referring to involves solubility and the formation of new phases when the concentration of a solute in a solution exceeds its solubility limit. Solubility refers to the maximum amount of solute that can be dissolved in a solvent at a given temperature. When this limit is surpassed, a supersaturated solution is formed. This is not a stable state, and it often results in precipitation. This is the process where a solute becomes insoluble and forms a new, separate solid phase.
For instance, if we take a saturated solution of silver chloride (AgCl), and add more AgCl to it, the excess will precipitate out of solution. Here, the concentration of AgCl has exceeded its solubility, leading to the formation of a new solid phase that is distinct from the original solution.
The exact composition and form of the new solid phase can depend on a variety of factors, including the type of solvent and solute involved, temperature, and pressure.
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Write the dissociation reaction and the corresponding ka equilibrium expression for hcn in water
The dissociation reaction of HCN in water is HCN(aq) ↔ H⁺(aq) + CN⁻(aq).
Here is the balanced dissociation reaction for hydrocyanic acid (HCN) in water:
HCN(aq) ↔ H⁺(aq) + CN⁻(aq)
The equilibrium expression for the acid dissociation constant (Ka) for this reaction is given by:
Ka = [H⁺][CN⁻] / [HCN]
This expression shows that the equilibrium constant (Ka) for HCN dissociation is determined by the concentrations of the hydrogen ions (H⁺), the cyanide ions (CN⁻), and the undissociated hydrocyanic acid (HCN) in the solution.
An increase in temperature can disturb the liquid-vapor equilibrium
True
False
MnO2+ 4HCL--->MnCl2+Cl2+2H2O:
if 0.86 mole of MnO2 and 48.2g of HCL react, which reagent will be used up first? How many grams of Cl2 will be produced?
The answers are HCL, and 23.4g.
How would I get these answers?,
I am studying for ACS and have trouble understanding how to rank molecules in decreasing or increasing solubility in water...
I know the rules of which molecules are insoluable...But how do you rank them in which is least or most soluble.
The question in the acs included
In which set are the substances arranged in order of decreasing solubility in water?
(A) Al(OH)3 > Mg(OH)2 > NaOH
(B) BaSO4 > CaSO4 > MgSO4
(C) CaCO3 > NaHCO3 > Na2CO3
(D) AgCl > AgBr > AgI
Writing net ionic equation:
A solution of diamminesilver(I) chloride is treated with dilute nitric acid.
So what I did was..
[Ag(NH3)2]Cl(aq) + HNO3(aq) -> __________
The answer is
[Ag(NH3)2]+ + Cl- + 2H+ -> AgCl + 2NH4+
I would guess that the oxidation #s for diamminesilver(I) chloride would be:
Ag +1
NH3 0
Cl -1
Can someone please show me the steps in between?
I don't really know how to break the [Ag(NH3)2]Cl apart and predict/form the products.
In this net ionic equation, we can see that the silver ion ([Ag(NH3)2]+) reacts with the chloride ion (Cl-) to form silver chloride (AgCl). Additionally, the two hydrogen ions (2H+) react with the two ammonia molecules (2NH3) to form two ammonium ions (2NH4+).
To write the net ionic equation for the reaction between diamminesilver(I) chloride and dilute nitric acid, let's break down the steps:
1. Start with the balanced molecular equation: [Ag(NH3)2]Cl(aq) + HNO3(aq) ->
2. Identify the ions present in the reactants and determine if any of them are spectator ions. In this case, we have [Ag(NH3)2]Cl and HNO3.
The [Ag(NH3)2]Cl dissociates into two ions: [Ag(NH3)2]+ and Cl-. However, HNO3 is a strong acid and fully dissociates into H+ and NO3- ions.
Therefore, the spectator ions in this reaction are Cl- and NO3-.
3. Write the net ionic equation by removing the spectator ions:
[Ag(NH3)2]+ + 2H+ -> AgCl + 2NH4+
In this net ionic equation, we can see that the silver ion ([Ag(NH3)2]+) reacts with the chloride ion (Cl-) to form silver chloride (AgCl). Additionally, the two hydrogen ions (2H+) react with the two ammonia molecules (2NH3) to form two ammonium ions (2NH4+).
To determine the oxidation numbers, you are correct in assigning +1 to silver (Ag) and -1 to chloride (Cl). However, the oxidation number of ammonia (NH3) is 0 because hydrogen (H) has an oxidation number of +1 and there are no other elements to balance out the charge.
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Which material needs extra energy to enable the movement of free electrons? A. Conductor B. Semiconductor C. Insulator D. Element
What was the total demand by all counties for water from the Sweetbriar River Basin in 1970? What is it projected to be in 2020?
What is the maximum amount of kcl that can dissolve in 200 g of water? (the solubility of kcl is 34 g / 100 g h 2o at 20°c.) 6800 g 34 g 68 g 17 g?
If the molecular mass of tetraoxosulphate(VI) acid is 98, calculate it's vapour density.
How many liters of fluorine gas, at 298 K and 0.98 atm, will react with 23.5 grams of potassium metal? Show all of the work used to solve this problem. 2K + F2 2KF
4130 J of energy 52g water 10 c initial specific heat 4.18 J waht would the final temperature be
Why is a spectrum for a given element unique for that element?
A. No element has more than two electrons in the first shell.
B. Each element has a unique arrangement of electrons.
C. Atoms of different elements have different masses.
D. Atomic nuclei contain no electrons.
Answer:
B
Explanation:
Which of the following statements is true? Oceanic crust is thicker than continental crust. Both oceanic and continental crust is made of granite. According to continental drift, the continents were once connected. The crust is thickest layer of the Earth.
Answer: According to continental drift, the continents were once connected
Explanation:
According to continental drift, the continents were once connected this statement is true.
What is true about continental drift ?Pangaea split into fragments over the course of millions of years, and each piece migrated away from the other. These components gradually came together to form the continent that is known today.
Today's scientists believe that a number of supercontinents, including Pangaea, have developed and fragmented during the Earth's history.
The theory of continental drift holds that Earth's continents have shifted relative to one another during geologic time, giving the impression that they have "drifted" over the ocean floor.
During one or more geologic periods, continents moved horizontally at a huge scale in relation to one another and to the ocean basins. This idea served as a crucial building block for the theory of plate tectonics, which includes it.
Thus, option C is correct.
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Consider the balanced equation below.
What is the mole ratio of Fe3O4 to Fe?
1:3
1:4
3:1
4:3
Answer:
1:3
Explanation:
Hope this helps :)
what is the urinary system and what does it do
1. A 10 g gold coin is heated from 25°C to 50°C (CAu is 0.13 J/g-°C). What is the H?
(Points : 1)
+32.5 J
25 J
+25 J
- 32.5 J
I know it is 32.5 J but is it negative or positive... I say it is negative, but I could be wrong...,
Answer:
+32.5 J
Explanation:
Describe how to make 1.50 liters of a 0.01 M ammonium chloride solution
Which particles in an atom could demonstrate that opposite charges attract?
A.
a neutron and an electron
B.
two protons together
C.
a proton and a neutron
D.
a proton and an electron
What is the [H+] of a solution with a pH of 6.6? Use a scientific calculator.
2.5 × 107
5.0 × 105
8.3 × 106
7.7 × 105
Considering the definition of pH, the concentration [H⁺] is 2.5 ×10⁻⁷ M.
Definition of pHpH is the Hydrogen Potential. It is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.
Mathematically, pH is calculated as the negative base 10 logarithm of the activity of hydrogen ions:
pH= - log [H⁺]
The numerical scale that measures the pH of substances includes the numbers from 0 to 14. The pH value 7 corresponds to neutral substances. Acidic substances are those with a pH lower than 7, while basic substances have a pH higher than 7.
Concentration [H⁺] of the solutionIn this case, being pH= 6.6, you can replace this value in the definition of pH:
6.6 = -log [H⁺]
Solving:
[H⁺]= 10⁻⁶ ⁶ M
[H⁺]= 2.5 ×10⁻⁷ M
Finally, the concentration [H⁺] is 2.5 ×10⁻⁷ M.
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How do most vertebrates reproduce—sexually or asexually? What are gametes? How is an embryo produced?
I NEED THE ANSWER QUICK
Will a precipitate form when 65.0 mL of 0.0200 M Ag2SO4 is mixed with 50.0 mL of 0.00500 M K2CO3? (Ksp for silver carbonate is 8.00 x 10–12).
Yes, the precipitate of silver carbonate will form.
To determine if a precipitate will form when 65.0 mL of 0.0200 M Ag2SO4 is mixed with 50.0 mL of 0.00500 M K2CO3, we need to compare the ion product (Qsp) with the solubility product constant (Ksp) for silver carbonate (Ag2CO3).
First, let's calculate the concentrations of ions after mixing the solutions:
For Ag2SO4:
- Initial moles of Ag2SO4 = 0.0200 M * 0.0650 L = 0.00130 moles
- Moles of Ag+ ions = 2 * 0.00130 moles = 0.00260 moles
- Concentration of Ag+ ions = 0.00260 moles / (0.0650 L + 0.0500 L) = 0.0200 M
For K2CO3:
- Initial moles of K2CO3 = 0.00500 M * 0.0500 L = 0.000250 moles
- Moles of CO3^2- ions = 0.000250 moles
- Concentration of CO3^2- ions = 0.000250 moles / (0.0650 L + 0.0500 L) = 0.00192 M
Now, to find out if a precipitate will form, we calculate the ion product, Qsp, for silver carbonate:
Qsp = [tex][Ag+]^2 * [CO3^2-][/tex]
Qsp = [tex](0.0200)^2 * (0.00192)[/tex]
Qsp = 7.68 x 10^-6
Compare Qsp with the Ksp of silver carbonate (Ag2CO3):
Ksp = 8.00 x 10^-12
Since Qsp (7.68 x 10^-6) is greater than Ksp (8.00 x 10^-12), the ion product exceeds the solubility product constant. According to the principles of solubility and precipitation, when Qsp > Ksp, a precipitate of silver carbonate (Ag2CO3) will form.
The precipitate of silver carbonate (Ag2CO3) will form when 65.0 mL of 0.0200 M Ag2SO4 is mixed with 50.0 mL of 0.00500 M K2CO3.
What type of stress is caused by two plates sliding past one another?
What is the mass, in grams, of 7.20×1020 molecules of caffeine, c8h10n4o2?
Answer: 0.23 grams
Explanation:
According to avogadro's law, 1 mole of every substance weighs equal to its molecular mass and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the number of moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given molecules}}{\text{Avogadro's number}}=\frac{7.20\times 10^{20}}{6.023\times 10^{23}}=1.2\times 10^{-3}moles[/tex]
1 mole of caffeine [tex](C_8H_{10}N_4O_2)[/tex] weighs = 194 g
[tex]1.2\times 10^{-3}[/tex] moles of [tex](C_8H_{10}N_4O_2)[/tex] weigh = [tex]\frac{194}{1}\times 1.2\times 10^{-3}=0.23g[/tex]
Thus mass of caffeine [tex](C_8H_{10}N_4O_2)[/tex] is 0.23 grams.