Answer:
Volume of solution is 0.88 L.
Explanation:
Given data:
Molarity of solution = 0.750 M
Mass of KNO₃ = 67.0 g
Volume of solution = ?
Solution:
Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.
Formula:
Molarity = number of moles of solute / L of solution
Now we will calculate the number of moles.
Number of moles = mass/molar mass
Number of moles = 67.0 g/ 101.1 g/mol
Number of moles = 0.66 mol
Now we will put the values in molarity formula.
0.750 M = 0.66 mol / L of solution
L of solution = 0.66 mol / 0.750 M
L of solution = 0.88 L
Volume of solution is 0.88 L.
Explain the arrangement of the first 20 elements in the periodic table.
Please help! Will give brainliest!
There are various kind of elements that are present in periodic table. Elements that are metals are kept on left side of periodic table and elements which are non metals are kept on right side of periodic table.
What is periodic table?Periodic table is a table in which we find elements with properties like metals, non metals and metalloids element arranges in increasing atomic number.
The first 20 elements of periodic table are Hydrogen, Helium, Lithium, Beryllium, Boron, Carbon, Nitrogen, Oxygen, Fluorine, Neon, Sodium, Magnesium, Aluminum, Silicon, Phosphorus, Sulfur, Chlorine, Argon, Potassium and Calcium. Out of these Lithium, Beryllium, Sodium, Magnesium. Potassium and Calcium are metals so they are kept on the left side of the periodic table while others are non metals so they are kept on right side of periodic table.
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16. As he developed his periodic table, Mendeleev grouped the elements lithium,
sodium, and potassium together. What observation was likely a factor in his decision
to group these elements?
Answer:
the reactivity and the valence electrons
Explanation:
the reactivity of the elements would have played a significant role in why such elements were grouped together. the number of valence electrons dictates how reactive an element is - the less valence electrons the more reactive it is. the column, group 1 in which these elements are put together in, show that each of the elements have 1 valence electrons and are therefore reactive.
you can go on to further explain what valence electrons are, explain what the group numbers are associated with the valence electrons and how valence electrons effect reactivity. further this, talk about how the three elements have the same number of valence electrons and therefore were grouped together
. Give two everyday examples of the thermal energy of a substance being increased.
Answer:
• the warmth from the sun
• the heat from another a heater
• A cup of hot chocolate
•baking in an oven
Two everyday example that we say for the thermal energy of a substance being increased are, faster movement of the substances and boiling if liquids as well light absorption.
What is thermal energy?Thermal energy is a form of energy generated by heating up a substance. It can also be generated by the movement of its particles.
Vibrating molecules increases the thermal energy of a substance. Similarly, when we heat a substance it acquires more thermal energy.
Another way of increasing thermal energy is light absorption by the substance. Thermal energy associated with light increases the temperature of of the system which is absorbed the light.
Hence, the two ways by which thermal energy of a substance is increased are heating or boiling and faster movement.
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If the hydrogen atom emits red, blue-green, blue, and violet light, how many energy levels does it have in the visible region of the spectrum?
A. 3
B. 4
C. 5
D. 6
Answer:
The correct answer is - option B. 4.
Explanation:
The visible spectrum of light emitted by a sample of active or excited hydrogen atoms splits into four wavelengths that are basically four distinct levels of energy in the visible region of the spectrum. There four different wavelengths are 410 nm, 434 nm, 486 nm, and 656 nm.
These shows for colors according to the spectrum and wavelength violet, blue, green, and red, where 656 nm wavelength is most intense on the spectrum.
If a hydrogen atom emits red, blue-green, blue, and violet light, the number of energy levels it has in the visible region of the spectrum is: B. 4
An electromagnetic spectrum can be defined as a range of frequency and wavelength that an electromagnetic wave is distributed (extends).
Generally, the electromagnetic spectrum comprises the following:
Gamma rays.Visible light.Ultraviolet radiation.X-rays.Radio waves.Infrared radiation.When the atom of an element emits a radiation, each color of the radiation represents an energy level within the visible region of the electromagnetic spectrum.
Since the hydrogen atom emitted four colors (red, blue-green, blue, and violet light), it has four (4) energy levels in the visible region of the electromagnetic spectrum.
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Calculate the density of the football. Use the formula D = m/V where D is the density, m is the mass, and V is the volume. Record your calculations in Table B of your Student Guide. What is the density of the football while it is deflated? g/cm3
Answer:
0.84 g/cm3 EDGE 2020
Explanation:
Answer:
What is the density of the football while it is deflated?
⇒ 0.84 g/cm3
Which of the following items would improve the experiment? Add more types of plants Test one plant with no fertilizer Use different soils for each plant Expose all six plants to green light
Answer:
Um, I'd say add more types of plants cause different plants react differently to things, I guess?
What is the speed of each vehicle? (Remember S=d/t)
A: 50 km/h, B: 40 km/h
A:5 km/h, B: 2 km/h
A: 10 km/h, B: 5 km/h
A: 20 km/h, B: 10 km/h
Answer : The correct option is A: 20 km/h, B: 10 km/h
Explanation :
Speed : It is defined as the distance traveled per unit time.
Formula used:
[tex]S=\frac{d}{t}[/tex]
where,
S = speed
d = distance
t = time
First we have to calculate the speed of vehicle A.
Given:
Distance of vehicle A = 50 km
Time of vehicle A = 2.5 hr
Now putting all the given values in the above formula, we get:
[tex]S=\frac{50km}{2.5hr}=20km/hr[/tex]
Now we have to calculate the speed of vehicle B.
Given:
Distance of vehicle B = 50 km
Time of vehicle B = 5 hr
Now putting all the given values in the above formula, we get:
[tex]S=\frac{50km}{5hr}=10km/hr[/tex]
Therefore, the speed of vehicle A and B is 20 km/hr and 10 km/hr respectively.
Is avocado a fruit or a vegetable?
(dont me with my question rn xD)
In a saturated solution that is in contact with solid Mg(OH)2, the concentration of Mg2 is 1.31 X 10-4M. What is the solubility product for Mg(OH)2
Answer:
Ksp = 8.99x10⁻¹²
Explanation:
The solubility of Mg(OH)₂ is described with the reaction:
Mg(OH)₂(s) → Mg²⁺(aq) + 2OH⁻(aq)
The solubility product, Ksp, is:
Ksp = [Mg²⁺] [OH⁻]²
As you can see from the reaction, when 1 mole of Mg²⁺ is produced, 2 moles of OH⁻ are produced too, if [Mg²⁺] is 1.31x10⁻⁴M, [OH⁻] = 2.62x10⁻⁴M
Replacing:
Ksp = [Mg²⁺] [OH⁻]²
Ksp = [1.31x10⁻⁴M] [2.62x10⁻⁴M]²
Ksp = 8.99x10⁻¹²The solubility product of the [tex]\rm Mg(OH)_2[/tex] has been [tex]\rm 8.99\;\times\;10^{-12}[/tex].
The balanced equation for the dissociation of Magnesium hydroxide has been:
[tex]\rm Mg(OH)_2\;\rightarrow\;Mg^2^+\;+\;2\;OH^-[/tex]
From the balanced chemical equation, dissociation of 1 mole magnesium hydroxide has been resulted in the 1 mole magnesium and 2 mole hydroxide ions.
Since, given magnesium concentration, [tex]\rm Mg^2^+=1.31\;\times\;10^-^4\;M[/tex]
The concentration of hydroxide ion, [tex]\rm OH^-[/tex] will be:
[tex]\rm 1\;M\;Mg^2^+=2\;M\;OH^-\\1.31\;\times\;10^-^4\;M=1.31\;\times\;10^-^4\;\times\;2\;M\;OH^-\\1.31\;\times\;10^-^4\;M=2.62\;\times\;2\;M\;OH^-\\[/tex]
The solubility product (ksp) of the reaction has been given as:
[tex]ksp=\rm [Mg^2^+]\;[OH^-]^2[/tex]
Substituting the values for ksp:
[tex]ksp\;=\rm [1.31\;\times\;10^-^4]\;[2.62\;\times\;10^-^4]^2\\\textit ksp=8.99\;\times\;10^-^1^2[/tex]
The solubility product of the reaction has been [tex]\rm 8.99\;\times\;10^{-12}[/tex].
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Which of the following always combines in definite proportions?
a. compound
b. homogeneous mixture
c. element
d. heterogeneous mixture
Answer:
The answer is heterogeneous mixture
True or False – When earthquakes occur, they form huge gaps in the earth’s surface.
Answer:
i think the answer is true pls mark branliest
Explanation:
Answer:
its true! earth quakes do form huge gaps in the earth surface
Explanation:
Concentration data is commonly monitored during a reaction to determine the order with respect to a reactant. Consider the types of observations listed, and determine which order is likely for that reactant. Assume all other factors are held constant.
An increase in the concentration of the reactant in solution causes the reaction rate to increase exponentially.
Choose...first order, second order, zero order
The reaction rate increases in direct proportion to the concentration of the reactant in solution.
Choose...first order, second order, zero order
The reaction rate is constant regardless of the amount of reactant in solution.
Choose...first order, second order, zero order
Answer:
An increase in the concentration of the reactant in solution causes the reaction rate to increase exponentially - first order
The reaction rate increases in direct proportion to the concentration of the reactant in solution -second order
The reaction rate is constant regardless of the amount of reactant in solution - zero order
Explanation:
The Order of Reaction refers to the power dependence of the rate on the concentration of each reactant. The order of reaction is determined experimentally and not necessarily by inspection.
Typically, in a second order reaction, the rate of reaction increases in proportion to increase in concentration.
For a first order reaction, the rate of reaction increases exponentially as the increase in concentration.
For a zero order reaction, the rate of reaction is independent of the concentration of the reactant.
If 65,000 J of energy were transferred to 450 g of water at 20˚C. What would have been the final temperature of the water?
Answer:
500g
Explanation:
Answer:Suppose that during the Icy Hot lab that 65 KJ of energy were transfered to 450 g of water at 20 degrees C. What would have been the final temerpatur
Explanation:
Calculate the mass of a sample of fruit sugar, fructose,
C6H1206, containing 2.65 X 1020 molecules.
Answer:
, containing 2.65 X 1020 molecules.
Explanation:
The mass of a sample of fruit sugar (fructose) C₆H₁₂O₆, containing 2.65 ×10²⁰ is equal to 2.88 g.
What is Avogadro's number?Avogadro’s number can be defined as the number of units in one mole of any chemical substance. Generally, these entities can be electrons, molecules, atoms, ions, or protons, depending upon the kind of chemical reaction or reactants and products.
The value of Avogadro’s constant is found approximately 6.022 × 10²³ mol⁻¹.
Given, the number of molecules of fructose = 2.65 ×10²⁰
The molar mass of the fructose = 180.16 g/mol
So 6.022 × 10²³ molecules of fructose have mass = 180.16 g
Then 2.65 × 10²⁰ fructose molecules will have mass = 2875.04 × 10⁻³ g
The mass of the 2.65 × 10²⁰ fructose molecules = 2.88 g
Therefore, the mass of 2.65 × 10²⁰ fructose molecules is equal to 2.88 g.
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For the equation 2 HCI + Zn ⇒ H₂ +ZnCI₂ suppose you had 2.00 g HCI and enough Zn.
a. What mass, in grams, would you have of Zn?
b. How many grams of H₂ would be produced?
Please show your work!!
Answer:
Zinc weighs 65.38 grams per mole, so we’ve got 0.994 moles of zinc (I’ll worry about sig figs at the end). HCl weighs 36.46 grams per mile, so we’ve got 1.78 moles of HCl. However, two moles of HCl react with one mole of zinc. So only 1.78/2 = 0.890 moles of Zinc are going to react.
One mole of zinc produces one mole of hydrogen, which weigh 2.02 grams per mole. So 0.890 moles * 2.02 grams/mole means 1.90 grams of hydrogen will be produced.
Since we have 2 sig figs in the weights given, the answer should have 2 sig figs, thus 1.9 grams.
This is just an example
Problem PageQuestion Iron(III) oxide and hydrogen react to form iron and water, like this: (s)(g)(s)(g) At a certain temperature, a chemist finds that a reaction vessel containing a mixture of iron(III) oxide, hydrogen, iron, and water at equilibrium has the following composition: compound amount Calculate the value of the equilibrium constant for this reaction. Round your answer to significant digits. Clears your work. Undoes your last action. Provides information about entering answers.
Complete question
The complete question is shown on the first uploaded image
Answer:
The value is [tex]K_c = 2.69 *10^{-5} [/tex]
Explanation:
From the question we are told that
The equation is
[tex]Fe_20_3_{(s)}+3H_{(g)}\to2Fe_{(s)}+3H_2O_{(g)}[/tex]
Generally the equilibrium is mathematically represented as
[tex]K_c = \frac{[H_2O]^2}{[H_2]^3}[/tex]
Here [tex][H_2O][/tex] is the concentration of water vapor which is mathematically represented as
[tex][H_2O ] = \frac{n_w}{V_s }[/tex]
Here [tex]V_s[/tex] is the volume of the solution given as 8.9 L
[tex]n_w[/tex] is the number of moles of water vapor which is mathematically represented as
[tex]n_w = \frac{m_w}{Z_w}[/tex]
Here [tex]m_w[/tex] is the mass of water given as 2.00 g
and [tex]Z_w[/tex] is the molar mass of water with value 18 g/mol
So
[tex]n_w = \frac{2}{18}[/tex]
=> [tex]n_w = 0.11 \ mol[/tex]
So
[tex][H_2O ] = \frac{0.11}{8.9 }[/tex]
=> [tex][H_2O ] = 0.01236 \ M [/tex]
Also
[tex][H][/tex] is the concentration of hydrogen gas which is mathematically represented as
[tex][H ] = \frac{n_v}{V_s }[/tex]
Here [tex]V_s[/tex] is the volume of the solution given as 8.9 L
[tex]n_v[/tex] is the number of moles of hydrogen gas which is mathematically represented as
[tex]n_v = \frac{m_v}{Z_v}[/tex]
Here [tex]m_w[/tex] is the mass of water given as 4.77 g
and [tex]Z_v[/tex] is the molar mass of water with value 2 g/mol
So
[tex]n_w = \frac{4.77}{2}[/tex]
=> [tex]n_w = 2.385 \ mol[/tex]
So
[tex][H_2O ] = \frac{2.385}{8.9 }[/tex]
=> [tex][H_2O ] = 0.265 \ M [/tex]
So
[tex]K_c = \frac{( 0.01236 )^3}{ (0.265 )^2}[/tex]
=> [tex]K_c = 2.69 *10^{-5} [/tex]
The salt copper(II) sulfate dissolves in water according to the reaction: CuSO4(s) Cu2+(aq) + SO42-(aq) (a) Calculate the standard enthalpy change ΔH° for this reaction, using the following data: CuSO4(s) = -771.4 kJ mol-1 Cu2+(aq) = 64.8 kJ mol-1 SO42-(aq) = -909.3 kJ mol-1 kJ (b) Calculate the temperature reached by the solution formed when 13.0 g of CuSO4 is dissolved in 0.109 L of water at 25.0 °C. Approximate the heat capacity of the solution by the heat capacity of 109 g of pure water (specific heat capacity = 4.18 J g-1 °C-1), ignoring the mass of the salt. °C (c) Heats of reaction find practical application in hot packs or cold packs. Would this dissolution reaction be appropriate for the preparation of a hot pack or a cold pack?
Answer:
(a) [tex]\Delta H=-73.1\frac{kJ}{mol}[/tex]
(b) [tex]T_2=38.1\°C[/tex]
(c) Yes, it is appropriated.
Explanation:
Hello.
(a) In this case, given the formation enthalpies for copper (II) sulfate, copper (II) ion and sulfate ion, we can compute the enthalpy change for such process as follows:
[tex]\Delta H=\Delta H_{Cu^{2+}}+\Delta H_{SO_4^{-2}}-\Delta H_{CuSO_4}\\\\\Delta H=64.8-909.3-(-771.4)\\\\\Delta H=-73.1\frac{kJ}{mol}[/tex]
(b) In this case, since 13.0 g of copper (II) sulfate (molar mass: 159.55 g/mol) we can compute the gained heat by water via:
[tex]Q_{water}=-n_{CuSO_4}\Delta H=-13.0g*\frac{1mol}{159.55g}* -73.1\frac{kJ}{mol}\\ \\Q_{water}=5.96kJ=5960J[/tex]
As the heat lost by the reaction is gained by the water, therefore, the final temperature is:
[tex]Q_{water}=m_{water}Cp_{water}(T_2-T_1)\\\\T_2=T_1+\frac{Q_{water}}{m_{water}Cp_{water}}\\ \\T_2=25.0\°C+\frac{5960J}{0.109L*\frac{1000g}{1L}*4.18\frac{J}{g\°C} } \\\\T_2=38.1\°C[/tex]
(c) In this case, since this dissolution reaction is exothermic as it increases the temperature when undergone, we can infer that yes, this dissolution would be appropriate for the preparation of a hot pack, because a cold pack would be with an endothermic dissolution reaction.
Best regards.
The diagram below shows a lithium atom. Which of the following correctly lists the particles in a lithium atom? *
Captionless Image
A. 3 protons, 4 neutrons, 3 electrons
B. 3 protons, 3 neutrons, 4 electrons
C. 4 protons, 4 neutrons, 3 electrons
D. 4 protons, 3 neutrons, 4 electrons
What is gonna be the density of a block charger that is 22g and 210 cm3
Answer:
Control group
help pls 100 points and brainiest
Answer:
The amount of salt solution.
Explanation:
so first you have to think about it as a y = mx + b function, where m and x are constants. So basically the independent variable is represented by the amount of salt solution because the health of the patient is affected by the amount of salt solution. this is how you would write it out as an equation so you can understand it better.
The Health of the patient = The amount of salt solution + b
Since y depends on the values of m, x, and b, The amount of salt solution would be the independent variable.
What do metalloids and non metals have in common
Answer:
Metalloids are brittle like Non-Metals
Explanation:
Can you determine the equation for density?
Answer:
YESBSJSKSSKEKEJRJRJER
I need someone to help with the bonus.
Answer:
268.3 m/sec
Explanation:
Which of the following is NOT powered by alternating current?
A) household electrical outlets
B) power tools
C) toasters
D) batteries
Answer:
batteries
Explanation:
bc they're powered by energy
What body of water is south of Constantinople? Atlantic Ocean Indus River Black Sea Mediterranean Sea
Mass is a unique property of any property.
Fluorescent light bulbs, or CFLs, prevent the loss of energy from light bulbs as ________ energy.
Answer:
Compact fluorescent lamps, or CFLs, use 75 percent less energy than a traditional incandescent bulb, but they never quite caught on for home use.Feb
Which of the following can be broken down by chemical processes but not physical processes?
elements
compounds
all of these
mixtures
Answer:
Elements and compounds
Explanation:
Elements and compounds, mixtures are not chemically bonded and can be physically seperated
step of the scientific method reviews your original question and your hypothesis.
results
observation
conclusion
experiment
Answer: conclusion
Explanation:
It say reviews your original question and your hypothesis
Answer:
conclusion!
Explanation:
Problem PageQuestion Methanol and oxygen react to form carbon dioxide and water, like this: (l)(g)(g)(g) At a certain temperature, a chemist finds that a reaction vessel containing a mixture of methanol, oxygen, carbon dioxide, and water at equilibrium has the following composition: compoundamount Calculate the value of the equilibrium constant for this reaction. Round your answer to significant digits. Clears your work. Undoes your last action. Provides information about entering answers.
Answer:
[tex]Kc=3.8x10^{-7}[/tex]
Explanation:
Hello.
In this case, for the chemical reaction:
[tex]2CH_3OH(l)+3O_2(g)\rightarrow 2CO_2(g)+4H_2O(g)[/tex]
We write the equilibrium expression including the gaseous or aqueous species only, that is why the methanol is not included due to heterogeneous equilibrium:
[tex]Kc=\frac{[CO_2]^2[H_2O]^4}{[O_2]^3}[/tex]
Whereas each gaseous species is powered to its stoichiometric coefficient (number before the species). In such a way, considering the equilibrium masses of carbon dioxide (44 g/mol), water (18 g/mol) and oxygen (32 g/mol) to be 1.56 g, 2.28 g and 3.33 g respectively, we compute the moles as we need molar concentrations in the equilibrium constant calculation:
[tex]n_{CO_2}=1.56g/(44g/mol)=0.0355mol\\\\n_{H_2O}=2.28g/(18g/mol)=0.127mol\\\\n_{O_2}=3.33 g/(32g/mol)=0.104mol[/tex]
Thus, into the 9.3.L vessel, the equilibrium concentrations are:
[tex][CO_2]=\frac{0.0355mol}{9.3L}=0.00382M[/tex]
[tex][H_2O]=\frac{0.127mol}{9.3L}=0.0137M[/tex]
[tex][O_2]=\frac{0.104mol}{9.3L}=0.0112M[/tex]
Therefore, the equilibrium constant shown with two significant figures is:
[tex]Kc=\frac{(0.00382M)^2(0.0138M)^4}{(0.0112M)^3} \\\\Kc=3.8x10^{-7}[/tex]
Best regards.