Answer:
Visible light
Explanation:
our eyes are sensitive to a very narrow band of frequencies within the enormous range of frequencies of the electromagnetic spectrum. This narrow band of frequencies is referred to as the visible light spectrum. Visible light.
Answer:
Visible light.
Explanation:
It says visible as in visible to us we cant see the others or they would also be called visible light.
How many atoms are in 3 NaCl?
Explanation:
Sodium Chloride or NaCl is made up of two elements, sodium (or Na) and chlorine (or Cl). A molecule of sodium chloride, NaCl, consists of one atom each of sodium and chlorine. Hence, each molecule of NaCl has 2 atoms total.
A 0.885 M solution of KBr whose initial volume is 82.5 mL has more water added until its concentration is 0.500 M. What is the new volume of the solution?
Answer:
[tex]V_2=146mL[/tex]
Explanation:
Hello there!
In this case, since the equation for the calculation of dilutions is:
[tex]M_1V_1=M_2V_2[/tex]
Whereas M is the molarity and V the volume, because the final concentration is lower than the initial. Thus, since we are asked to calculate the final volume, we solve for V2 as follows:
[tex]V_2=\frac{M_1V_1}{M_2}=\frac{0.885M*82.5mL}{0.500M}\\\\V_2=146mL[/tex]
Best regards!
A sample of 2.0 moles of helium gas is contained in a tank with a volume of 5.0L at a temperature of 25°C. What is the pressure of the gas in the tank
in atm?
Given: R = 0.0821 L.atm/mol.K
O 9.8 atm
O 0.00069 atm
O 0.82 atm
O 0.0082 atm
Answer: Pressure of the gas in the tank is 9.8 atm.
Explanation:
Given: Moles = 2.0 moles, Volume = 5.0 L
Temperature = [tex]25^{o}C = (25 + 273) K = 298 K[/tex]
Formula used to calculate pressure is as follows.
PV = nRT
where,
P = pressure
V = volume
n = no. of moles
R = gas constant = 0.0821 L atm/mol K
T = temperature
Substitute the values into above formula as follows.
[tex]PV = nRT\\P \times 5.0 L = 2.0 mol \times 0.0821 L atm/mol K \times 298 K\\P = \frac{2.0 mol \times 0.0821 L atm/mol K \times 298 K}{5.0 L}\\= 9.8 atm[/tex]
Thus, we can conclude that pressure of the gas in the tank is 9.8 atm.
What is the energy of a photon that emits a light of frequency 4.47 x 10^14 Hz?
A. 6.71 x 10^-19 J
B. 6.75 x 10^-19 J
c. 1.34 x 10^-19 J
D. 2.96 x 10^-19 J
Answer:
2.96 x 10^-19 J
Explanation:
I just took the test
Can someone help me
Answer:
Its refraction
Explanation:
becuase refraction is the change in direction of a wave passing from one medium to another, where the straw appears to be split apart because of the waters direction.
2). A student collects 425 L of oxygen at a temperature of 24.0°C and a pressure
of 0.899 atm. How many moles of oxygen did the student collect?
Answer:
15.5 moles
Explanation:
Applying,
PV = nRT.................. Equation 1
Where P = pressure, V = Volume, n = number of mole, R = molar gas constant, T = Temperature.
Make n the subject of the equation
n = PV/RT............... Equation 2
From the question,
Given: P = 0.899 atm, V = 425 L, T = 24 °C = (273+24) K = 297 K.
Constant: R = 0.083 L.atm/K.mol
Substitute these values into equation 2
n = (0.899×425)/(297×0.083)
n = 15.5 moles
Which is NOT part of the male reproduction system of a flower? stamen pollen anther pistil
Answer:
Pistil
Explanation:
I believe it is the pistil, because the pistil is part of the female reproductive system of a flower. A stamen is for the male reproductive system.
Please help me with this homework
Answer:
The answer is C density.
Select the correct answer.
In an isolated system, two copper bars at different temperatures transfer energy until both are at the same temperature. How would the
transfer of energy be different if the bars were in an open system?
O A. Energy transfer would occur only between the copper bars.
OB. Energy transfer would occur between the copper bars and the surroundings.
Ос. No energy transfer would occur between the copper bars or the surroundings.
OD. Energy transfer would occur only with the surroundings.
Reset
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San ou
Answer:
OB. Energy transfer would occur between the copper bars and the surroundings.
Explanation:
We define an isolated system as a system in which there is neither exchange of material nor energy while an open system is one in which materials and energy can be exchanged with the environment.
Given an open system consisting of two copper bars at different temperatures, energy will not only be exchanged between the copper bars but also between the copper bars and the environment.
In the Reaction CuCl2 + 2 NaNO3 —> Cu(NO3)2 + 2 Naci
If 17.2 grams of copper (II) chloride, CuCl2 reacts with 22.6 grams of sodium nitrate, NaNO3, how many grams of sodium chloride, NaCl, will be produced?
Molor mass of CuCl2 = 134.45 g/mol
Molar mass of NaNO3 = 85.00 g/mol
Molar moss of NOCI = 58.44 g/mol
Answers:
17.2 grams CuCl2= - -g NaCl
22.6 grams NaNO3= - -g NaCl
What is the Limiting Reactant?
Explanation:
The molar mass of the compounds are incorrect
The dark areas on the world map show places with climates that are alike. The table shows information for those places. A
student is using the map and table to describe the climates of those places.
Which sentence describes the climates of the dark areas
on the map?
A. They are arid climates because they are dry and
hot
B. They are polar climates because they are dry
and cold
C. They are tropical climates because they are hot
and wet.
D. They are temperate climates because they are
mild and moist.
Usual Temperature Usual Precipitation
Low to very low
Little or no snow all year
temperatures all year
Answer:
Choice B
They are polar climates because they are dry
and cold
Que unidad utilizamos para medir un átomo de oxígeno??
Answer:
Im pretty sure you use mass
Explanation:
Answer:
Los químicos eligen definir la AMU como 1/16 de la masa promedio de un átomo de oxígeno que se encuentra en la naturaleza; es decir, el promedio de las masas de los isótopos conocidos, ponderado por su abundancia natural. Los físicos, por otro lado, lo definieron como 1/16 de la masa de un átomo del isótopo oxígeno-16 (16O).
what is the percentage of oxygen in air
ASAP...
Explanation:
21 % of oxygen is present in air .
hope it is helpful to you
A chemist observed bubbling and fizzing after adding an acid solution to a
white powdery substance in a beaker. Which of the following can be
inferred?
Answer:
a chemical reaction occured
Explanation:
bubbling and fizzing after adding a substance, most offten means a chemical reaction is happening
0.225L solution of H2CO3 is neutralized by 0.0880L of a 1.22 M Fe(OH)3 solution. What
is the concentration of the H2CO3 solution?
Answer:
0.716
Explanation:
First, write the balanced equation:
3 H2CO3 + 2 Fe(OH)3 ----> Fe2(CO3)3 + 6 H2O
Second, go from the molarity of H2CO3 to liters of Fe(OH)3
(Pull mole ratio from balanced equation)
1.22/1L x 0.0880/1 x 3molH2CO3/2molFe(OH)3 x 1/0.225L
Use calculator, and you end up with 0.7157333
Round to 0.716
How many moles of acetylene are needed to completely react with 16.5g of CO2
Answer:
0.375 mols
Explanation:
Relative atomic mass Ar of C=12×1=12Relative atomic mass Ar of O=16×2=32Realitive formula mass Mr is 12+32=44mol:mass
1 : 44
x :16.5
cross multiply and get the answer
Which formula represents an isomer of this compound?
Answer:
Explanation:
I can’t explain but this is the answer LOL
What is the total pressure of a gas mixture containing partial pressures of
0.23 atm, 0.42 atm, and 0.89 atm?
A. 1.54 atm
B. 0.89 atm
C. 0.42 atm
D. 0.51 atm
SUBM
Answer:
1.54 atm
Explanation:
By Dalton's Law Of partial pressure,
Total Pressure = Sum of all partial pressures
So,P= P1 + P2 + P3
Therefore, P=0.23+0.42+0.89
=1.54 atm
2
Which of the following equations is not balanced?
A Fe +S → FeS
B
KOH + HCl → KCI + H2O
2Mg + O2 + 2Mgo
D
NaCl + H2SO4 → Na2SO4 + HCI
Answer:
equation (D) is not balanced
balanced
2NaCl + H2SO4 —> Na2SO4 + 2HCl
The chemical equation not balanced is:
NaCl + H₂SO₄ → Na₂SO₄ + HCI
What is the balanced chemical equation?A chemical equation can be described as the reactants involved in the reaction, products produced, and an arrow denoting the direction of the chemical reaction. The chemical equation is a way to represent the chemical reaction in a short way.
A balanced equation in which the number of atoms of each element is equal on both sides of the chemical equation.
The law of conservation of mass is needed to follow while balancing the equation. The total mass of the elements on both sides (reactant and product side) in a balanced chemical equation.
NaCl + H₂SO₄ → Na₂SO₄ + HCI is not a balanced chemical equation as the number of hydrogen and sodium on both sides. The balanced chemical equation will be:
2 NaCl + H₂SO₄ → Na₂SO₄ + 2 HCI
Learn more about the balanced chemical equation, here:
brainly.com/question/28294176
#SPJ2
pls help me ASAP
its very urgent
Answer:
C Region
Explanation:
C Region contains all the liquids as 0 °C is the freezing point of water (Crystals of water are formed leaving it no more in the liquid state) and 100 °C is the boiling point (The water boils leaving it no more in the liquid state).
Hence, All liquids are contained in the C region.
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AH1807PLS HELPP ...All alkali metals react with water to produce hydrogen gas and the corresponding alkali metal hydroxide
A typical is that between lithium and water: 2Li(s) + 2H2O(l) 2LiOH(aq) + H2(g)
(a) How many moles of H2 can be formed by the complete reaction of 6.23 moles of Li with
water?
(b) How many grams of H2 can be formed by the complete reaction of 80.57 g of Li with
water?
Answer:
A) 3.115 mol
B) 11.60 g h2
Explanation:
From the equation
2 mol Li gives 1 mol H2
Then 6.23 gives??
6.23 /2 = 3.116 mol H2
B) moles of Li =mass! molar mass
= 80.57/ 6.941 = 11.6 mol Li
Then moles of H2 = 11.6 /2 = 5.8 mol H2
Mass of H2 = mol * molar mass
5.8*2 =11.6 g h2
The moles of hydrogen formed with 6.23 moles of Li have been 3.115 moles. The mass of hydrogen formed with 80.57 grams of Li has been 11.60 grams.
From the balanced chemical equation,
2 moles Li = 1 mole Hydrogen
(a) The given moles of Li = 6.23 mol .
6.23 mol of Li = [tex]\rm \dfrac{1}{2}\;\times\;6.23[/tex] moles of hydrogen
6.23 mol Li = 3.115 moles of hydrogen.
The moles of hydrogen formed with 6.23 moles of Li have been 3.115 moles.
(b) The moles can be expressed as:
Moles = [tex]\rm \dfrac{weight}{molecular\;weight}[/tex]
Moles of Li in 80.57 grams:
Moles of Li = [tex]\rm \dfrac{80.57}{6.941}[/tex]
Moles of Li = 11.60 moles
The amount of Hydrogen formed:
2 moles Li = 1 mole Hydrogen
11.60 mol of Li = [tex]\rm \dfrac{1}{2}\;\times\;11.60[/tex] moles of hydrogen
11.60 mol Li = 5.803 moles of hydrogen.
Mass = moles × molecular mass
Mass of 5.803 moles of Hydrogen = 5.803 × 2
Mass of hydrogen = 11.60 grams
The mass of hydrogen formed with 80.57 grams of Li has been 11.60 grams.
For more information about the moles formed, refer to the link:
https://brainly.com/question/19085755
Who was the leader of Iraq? *
Osama Bin Laden
Mikael Gorbachev
Şaddam Hussein
Answer: I believe it was Şaddam Hussein
Explanation:
What is the volume occupied by 0.17 grams of gaseous H2S at 27◦C and 380 torr?
Answer:
0.25 liter
Explanation:
Trust
2) What is an atom? Name and give the charges of the three particles inside the atom.
Past due! Help please I choose the middle picture for my hypothesis being inclusive can you help explain why and how it shows it’s being inclusive?
Answer:
Explanation:
its supposed to be not supported not inclusive because you said mix
What is the pOH of a 3.0 x10-3 M NaOH solution?
pOH =
Answer:
2.5
Explanation:
From the question given above, the following data were obtained:
Molarity of NaOH = 3.0x10¯³ M
pOH =?
Next, we shall determine the concentration of the hydroxide ion in the solution. This can be obtained as follow:
NaOH (aq) —> Na⁺ (aq) + OH¯ (aq)
From the balanced equation above,
1 mole of NaOH produced 1 mole of OH¯.
Therefore, 3.0x10¯³ M NaOH will also produce 3.0x10¯³ M OH¯.
Finally, we shall determine the pOH of the solution. This can be obtained as illustrated below:
Concentration of hydroxide ion [OH¯] = 3.0x10¯³ M
pOH =?
pOH = – Log [OH¯]
pOH = – Log 3.0x10¯³
pOH = 2.5
Thus, the pOH of the solution is 2.5
Perform an on-line search to find real-world uses for the titration process. State what you find below.
Answer:
The titration process has quite a few real-world uses, including key roles in the food industry and medical community. The titration process is essentially an analytical technique, as it is used to determine a chemical or physical property of a chemical substance, element, or mixture (such as food). Specifically in the food industry, it is used to allow food manufactuers to determine the quantity of a reactant in a sample. To provide an example, it can be used to find the specific amount of stuff that is usually labeled on the nutrition label, such as sugar, salt, protein, calcium, vitamin C, etc. As for the medical world, pharamcists typically use this process to get the proper mix when compounding medicines. It is used to get the necessary proportions in intravenous drips.
What is the molarity of a 9.13 L soda that contains 13.83 of sugar?
Answer:
1.52 M
Explanation:
Molarity of a solution is calculated as follows:
Molarity = number of moles (n) ÷ volume (V)
Based on the information given in this question,
Volume of soda (V) = 9.13 L
number of moles = 13.83 mol
Molarity = 13.83 ÷ 9.13
Molarity = 1.52 M
I NEED HELP FAST
Identify the charges that are negative
А
B
helppppppp plzzzzzzz
Answer:
is this done on a chrombook? it looks like it pls i need points to get to 1000 points so please just leave my answer
Explanation: