Answer:
The visible light spectrum is the section of the electromagnetic radiation spectrum that is visible to the human eye. Essentially, that equates to the colors the human eye can see. It ranges in wavelength from approximately 400 nanometers (4 x 10 -7 m, which is violet) to 700 nm (7 x 10 -7 m, which is red).
(Hope this helps) Sky
How many moles of MgCl2, are in 400. L of a 0.021 M solution?
A 0.75 mol
B 8.4 mol
C 7.5 mol
D 0.84 mol
Answer:
The correct answer to the following question will be Option B "8.4 mol".
Explanation:
The given values are:
Molarity of a solution = 0.021 M
Litres of solution = 400 L
Let the moles be "x".
As we know,
⇒ [tex]Molarity = \frac{Moles \ of \ solute}{Litres \ of \ solution}[/tex]
On putting the estimated values, we get
⇒ [tex]0.021=\frac{x}{400}[/tex]
On applying cross-multiplication, we get
⇒ [tex]x =0.021\times 400[/tex]
⇒ [tex]x=8.4 \ mol[/tex]
In calculating the mass of an atom the mass of the electrons is essentially
Answer:
Sex
Explanation:
How many atoms are in a casein molecule?
Volume is the
variable, and the
temperature of the gas is the
variable.
DONE
Answer:
Volume is the dependent variable, and the
temperature of the gas is the independent variable.
Explanation:
Variables Independent Variable: temperature; Dependent Variable: volume
Constants: pressure and number of molecules
"Volume is the variable, and the temperature of the gas is the variable," it means that volume and temperature are both variables in a certain context or scenario.
A variable is a factor or quantity that can change or vary in value. In this case, volume and temperature are the variables being discussed.
Volume refers to the amount of space occupied by a gas. It can be altered by changing the physical conditions of the system, such as adding or removing gas molecules or changing the container size.
Temperature, on the other hand, refers to the measure of the average kinetic energy of the gas molecules. It determines the speed and energy of the gas particles. Temperature can be modified by adding or removing heat from the system.
Both volume and temperature play crucial roles in understanding the behavior of gases, particularly in gas laws such as Boyle's Law, Charles's Law, and the Ideal Gas Law.
Therefore, volume and temperature are being identified as variables that can be independently manipulated or observed to study the behavior of gases or analyze specific gas-related phenomena.
Know more about Boyle's Law:
https://brainly.com/question/21184611
#SPJ2
Your question is incomplete, but most probably your full question was.
"Volume is variable, and the temperature of the gas is variable". Explain this statement.
What are electromagnetic waves, and how can they be seen?
radio waves, microwaves, infrared, light, ultraviolet, X-rays, and gamma rays. Your mind interprets the energies of light as different colors, from red to violet.
You have just started working at a swimming pool supply store and they have nitric acid on their shelves. In order to help customers adjust the pH of their swimming pool you must know many details about this chemical. Due to air conditioning the store is always at 25 degrees Celsius. The label on the nitric acid bottle is marked as 0.0155 mol/L. What is the hydronium ion concentration?
Answer:
The concentration of hydronium ions is 0.0155 mol/L
Explanation:
The aqueous solution ionization reaction for nitric acid is as follows;
HNO₃ + H₂O → NO₃⁻ + H₃O⁺
Whereby HNO₃ is a strong acid and it undergoes complete ionization in an aqueous solution
Hence one mole of HNO₃ produces one mole of H₃O⁺ ions
0.0155 mol/L HNO₃ will have 0.0155 moles of H₃O⁺ in one liter of the solution
The concentration of hydronium ions = 0.0155 mol/L.
Practice with Dilution Calculations IV,
12V
1. What is the initial volume of a 15.0 M stock solution which has been diluted to a final volume of
250.-ml at a concentration of 2.35 M?
Answer:
THE INITIAL VOLUME OF THE STOCK SOLUTION IS 0.0392 L OR 39.2 mL
Explanation:
To calculate the volume of a solution before dilution, we make use of the dilution formula;
C1 V1 = C2 V2
C1 = the concentration of the stock solution = 15 M
V 1 = the volume of stock solution = ?
C2 = concentartion of final solution = 2.35 M
V2 = volume of final solution = 250 mL = 250/ 1000 = 0.25 L
Rearranging the formula, we obtain;
V1 = C2V2 / C1
V 1 = 2.35 * 0.25 / 15
V1 = 0.5875 / 15
V1 = 0.0392 L
the initial volume of the stock solution is 0.0392 L or 39.2 mL
A weather balloon has a maximum volume of 6.25 x 10^3 L. The balloon contains 510. L of helium gas at a pressure of 0.882 atm. What will be the pressure when the balloon is at maximum volume?
A 72.0 atm
B .0720 atm
C 2,811,375 atm
D 22.4 atm
Answer:
0.0720 atm
Explanation:
Boyle's Law
13. Hydrogen and helium have both been used to fill balloons. Which property of helium
makes it the preferred choice to hydrogen?
Answer:
Helium is lighter than Hydrogen and Helium is a much safer gas.
Answer:
Helium gas is known to be very light which makes it a preferred choice to hydrogen. Helium has low boiling point, low density, low solubility, high thermal conductivity and inertness. Since it is less dense, it is considered suitable for filling balloons.
A scientist provides 454 kJ of energy to a covalent compound in order to start a reaction. As a result, heat is released. Which statement is true about this experiment?
The amount of energy produced is more than 454 kJ.
The amount of energy produced is equal to 454 kJ.
The amount of energy produced is less than 454 kJ.
The amount of energy produced is at least double that of 454 kJ.
Answer:
The amount of energy produced is less than 454 kJ.
Explanation:
I do not know but if am wrong you can correct me. I need your help for business, english and chemistry questions on my profile. So can you and the other person who commented and go on my profile please...? the due date already gone 12 days ago.
What is one common reaction to all hydrocarbons?
Answer:
Common properties of hydrocarbons are the facts that they produce steam, carbon dioxide and heat during combustion and that oxygen is required for combustion to take place. The simplest hydrocarbon, methane, burns as follows: CH4 + 2 O2 → 2 H2O + CO2 + energy.
Explanation:
can u answer this?
Mass: 126 g
Volume: 15 cm to the third power
Density:?
Answer:
Calculate density
Weight/mass
126
g
Volume
15
cm³
Density
8,400
kg/m³
Explanation:
Why are alloys useful?
Answer:
Yes, they are useful.
Explanation:
They allow us to make use of strengths and benefits of a particular element while not being hampered by it's faults.
Flexible expenses _________ from month to month.
A.
vary
B.
increase
C.
decrease
D.
remain unchanged
Answer:
A
Hope this helps.
Answer:
A. vary
Explanation:
Determine whether or not the equation below is balanced. If it isn’t balanced, write the balanced form. Also, identify the reactant(s) and product(s) in this equation. Finally, label this as one of the five types of reactions: combination, decomposition, substitution, double replacement, or reversible.
Answer:
This is a balanced equation because the same types of atoms and the same numbers of each atom are present on both sides of the equation. 8 S atoms are found on both sides of the equation, and 48 F atoms are found on both sides of the equation. S8 and 24F2 are the reactants; 8SF6 is the product. This is a combination reaction because two substances (S8 and 24F2) undergo a chemical union to form a more complex substance (8SF6).
S8+24F2→8SF6
Explanation:
any object that travels around another object in space is a (n) -
Answer:
The answer is Satellite
Explanation:
Describe, in detail, the arrangement of the periodic table, and why it is sometimes referred to as the "chemists' calendar". Describe the rows and columns. What do they tell us about the elements in each row or column? What other trends are on the periodic table?
Answer:
The periodic table is an arrangement of chemical elements based on increasing atomic numbers.
Explanation:
The periodic table is an arrangement of chemical elements in order of increasing atomic numbers. According to the modern periodic law, the properties of elements is a periodic function of their atomic numbers.
The periodic table is arranged in columns and rows. The columns are called groups of elements. All elements in the same group have the same number of electrons on their outermost shell hence they possess the same chemical behavior. Elements across a period have the same number of shells thus they have the same maximum excitation level.
There are important trends across the periodic table such as atomic radius, ionic radius, electro negativity, electron affinity, melting and boiling points, metallic properties etc. All these depend on an elements position in the periodic table. periodic properties of elements increase or decrease across the period or increase or decrease down the group as the case maybe.
Hence, just as one can easily read off the date and make predictions based on dates shown in a calendar, a chemist can read off the properties of elements and make predictions about the reactivity and physical properties of elements based on their relative position in the periodic table.
Gradual changes that occur down the group in the periodic table are called group trends and they usually very significant in discussing the properties of members of a group.
Answer:
The periodic table is an arrangement of chemical elements based on increasing atomic numbers.
Explanation:
The periodic table is an arrangement of chemical elements in order of increasing atomic numbers. According to the modern periodic law, the properties of elements is a periodic function of their atomic numbers.
The periodic table is arranged in columns and rows. The columns are called groups of elements. All elements in the same group have the same number of electrons on their outermost shell hence they possess the same chemical behavior. Elements across a period have the same number of shells thus they have the same maximum excitation level.
There are important trends across the periodic table such as atomic radius, ionic radius, electro negativity, electron affinity, melting and boiling points, metallic properties etc. All these depend on an elements position in the periodic table. periodic properties of elements increase or decrease across the period or increase or decrease down the group as the case maybe.
Hence, just as one can easily read off the date and make predictions based on dates shown in a calendar, a chemist can read off the properties of elements and make predictions about the reactivity and physical properties of elements based on their relative position in the periodic table.
Gradual changes that occur down the group in the periodic table are called group trends and they usually very significant in discussing the properties of members of a group.
Explanation:
what do many bases have in common
Answer:
they often form hydroxide ions
Explanation:
How does the difference in electronegativity values determine the type of bond that occurred? Ionic or covalent
How much solute will remain undissolved when 180 g of potassium iodide is added in 100 cm3 of water at 30°C?
Answer:
[tex]m_{undissolved}=27g[/tex]
Explanation:
Hello,
In this case, we first define the solubility as the maximum amount of a solute that is completely dissolved in an specific amount of solvent and it is temperature-dependent. Thus for potassium iodide, its solubility at 30°C is 153 g per 100 cm3 of water, therefore, with the given amount, the undissolved amount results:
[tex]m_{undissolved}=180g-153g=27g[/tex]
Best regards.
A sample of grape juice has a hydroxide ion concentration of 1.4 × 10-10 M. Which of these equations will you use to find the hydronium ion concentration?
Explanation:
Since [H+] [OH-] =10^(-14)
[H+] = (10^-14) / (1.4×10^-10)
The thermochemical equation shows the combustion of carbon in oxygen. How many moles of carbon, C must be burnt to produce 196.5 kJ of heat?
Given thermochemical equation; C(s) + O2(g) -> CO2(g) = -393 kJ mol ‐¹
Answer:
0.5 moles OF CARBON WILL BE BURNT SHOULD 196.5 kJ OF HEAT IS LIBERATED IN THE REACTION.
Explanation:
The standard heat of combustion of a substance is the heat evolved when one mole of the substance is burned completely in oxygen under standard conditions.
From the reaction, -393kJ of heat is required to burn 1 mole of Carbon completely in oxygen.
C(s) + O2 (g) -----> CO2(g) -393 kJ mol^-1
Should 196.5 kJ of heat was evolved by the reaction, the number of moles of carbon to be produced will be x moles;
-393 kJmol^-1 of heat was required to burn 1 mole of Carbon
196.5 kJ/mol of heat will burn x moles of carbon.
x = ( 196.5 * 1 / -393)
x = -0.5 moles
0.5 moles of carbon will be burnt when 196.5 kJ of heat is liberated
How do you think climate change affected the strength of the hurricane?
Why would Pluto be colder than all of the other planets?
Answer:
Pluto is farthest from the sun and hence it receives extremely low energy of sun. The surface temperature of Pluto is about -240 !!!
The pH of a solution is 7.880. What is the concentration of [H30+] in the solution ?
Answer:
the concentration is 10^(-8) M
The concentration of [H30+] in the solution when the pH of the solution is [tex]1.32*10^8\ m.[/tex]
Calculation of the concentration:Since The pH of a solution is 7.880
So here
pH = -log{H+}
{H+} = [tex]10^-PH[/tex]
[H30+] [tex]= 10^{-7.88}[/tex]
[tex]= 1.3182*10^-8\ mol\\\\= 1.32*10^-8\ m[/tex]
hence, The concentration of [H30+] in the solution is [tex]1.32*10^8\ m.[/tex]
Learn more about concentration here: https://brainly.com/question/23063846
PLEASE HELP DUE AT 2PM I'M DESPERATE, WILL GIVE BRAINLEST!!
1. When magnesium is burned in air, its mass increases. Explain why this is.
2. When a match is burned in air, its mass decreases. Explain why this is.
3. This equation is unbalanced Na + F2 → NaF. Explain how you know it is unbalanced.
4. Why does it need to be balanced? Refer to the conservation of mass in your answer
5. A student heats up a metal and finds that its mass increases. The students says “this is because heat has been added.” Explain why this is incorrect.
Answer:
Ans no 1. As magnesium used to react with oxygen and due to the reaction the mass (weight) of magnesium increases , this reaction between oxygen and magnesium which form magnesium oxide in the air by forming white smoke increases the mass of magnesium
What are five things gravity can do
How did greenhouse gasses get their name?
Answer:
Greenhouse gasses got their name from a greenhouse
Explanation:
Since greenhouses have plants inside in which the building lets sunlight in to the plants and greenhouse gasses trap heat. (sorry if my answer is confusing)
The flesh of a cut apple turns brown when left out in the air. Is this a chemical change or a physical change? Why?
Answer:
Chemical Change
Explanation:
apples turn brown because of a chemical reaction named oxidation which is cause by oxygen of the air
Oxygen is one of the most reactive chemicals known to exist.. There are a variety of oxidation reactions .. The fridge does not stop chemical reactions so bacteria will still rot the food eventually and out side of the fridge it would rot quicker than the fridge .
Answer:
Chemical change
i got it right
Explanation:
will give brainliest for correct answer!!!
Which particles are gained and lost during a redox reaction?
A) electrons
B) protons
C) neutrons
D) positrons
Answer:
Atoms of Zn (s) lose electrons and are oxidized. Atoms of Zn (s) lose electrons and are reduced. There is a net loss of mass. There is a net gain of mass.
Explanation: