Answer:
4.955x10¹²nm
Explanation:
It is possible to obtain wavelength from the frequency of a wave using the expression:
ν = C / λ
Where wavelength, ν, is given in m
Speed of light, C, is 2.998x10⁸m/s
And frequency, λ, is given in Hz = s⁻¹ = 6.05x10⁴s⁻¹
ν = C / λ
ν = 2.998x10⁸m/s / 6.05x10⁴s⁻¹
ν = 4955m
In nm:
4955m * (1x10⁹nm / 1m) =
4.955x10¹²nmAn atom of element Be has four protons, four electrons, and five neutrons. Which element below could be an isotope of this atom? Sodium-10 beryllium-10 boron-9 carbon-9
Answer:
beryllium-10
Explanation:
An isotope is an atom of the same element that has a different number of neutrons.
This means that an isotope of beryllium (Be) would have to be beryllium as well.
The number 10 references the fact that it has four protons and six neutrons:
4 protons + 6 neutrons = 10
While usually the element has 5 neutrons, so it is beryllium-9.
The element that could be an isotope of the atom with four protons, four electrons, and five neutrons is boron-9 and the correct option is option 3.
Isotopes are atoms of the same element that have a different number of neutrons. In this case, the given atom of beryllium has five neutrons, so an isotope of beryllium would have a different number of neutrons.
Among the options provided, boron-9 has a different number of neutrons (four) and is therefore a possible isotope of beryllium. Sodium-10, beryllium-10, and carbon-9 have different numbers of protons and are different elements.
Thus, the ideal selection is option 3.
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How many grams of potassium oxide would be needed to produce 5.00 g of potassium nitrate (KNO3) ?
Answer:
Mass = 2.355 g
Explanation:
Given data:
Mass of K₂O needed = ?
Mass of KNO₃ produced = 5.00 g
Solution:
Solution:
K₂O + 2HNO₃ → 2KNO₃ + H₂O
Number of moles of KNO₃:
Number of moles = mass/molar mass
Number of moles = 5.00 g/ 101.1 g/mol
Number of moles = 0.05 mol
now we will compare the moles of KNO₃ and K₂O.
KNO₃ : K₂O
2 : 1
0.05 : 1/2×0.05 = 0.025 mol
Mass of potassium oxide needed in gram:
Mass = number of moles × molar mass
Mass = 0.025 mol × 94.2 g/mol
Mass = 2.355 g
calculate the volume occupied by 0.500 mol of co2 at a pressure of 150 and temperature if 19 degrees celsius
Answer:
i think its A sorry if im wrong
Explanation:
What is the formula for the following?
hydroiodic acid
Answer:
HI
Explanation:
it is a very strong acid made by dissolving hydrogen iodide in water.
The science of classifying and naming organisms based on their different characteristics is called _________.
Answer:
taxonomy
Explanation:
Answer:
Taxonomy
Explanation:
The taxonometric way of classifying organisms is based on similarities between different organisms. A biologist named Carolus Linnaeus started this naming system. He also chose to use Latin words.
What is k in the rate law equation?
Rate = k[A]^m[B]^n
O A. A volume constant
B. A rate constant
C. An equilibrium constant
O D. A pressure constant
Answer:
B. What is k in the rate law equation?
Rate = k[A]^m[B]^n its rate constant
The double replacement reaction between calcium nitrate (Ca(NO3)2) and potassium oxide (K2O ) is shown below:
Ca(NO3) 2 + K2 O → CaO + KNO3
How many grams of potassium oxide would be needed to produce 5.00 g of potassium nitrate (KNO3) ?
Answer:
Mass = 2.355 g
Explanation:
Given data:
Mass of K₂O needed = ?
Mass of KNO₃ produced = 5.00 g
Solution:
Chemical equation:
K₂O + Ca(NO₃)₂ → CaO + 2KNO₃
Number of moles of KNO₃:
Number of moles = mass/molar mass
Number of moles = 5.00 g/ 101.1 g/mol
Number of moles = 0.05 mol
now we will compare the moles of KNO₃ and K₂O.
KNO₃ : K₂O
2 : 1
0.05 : 1/2×0.05 = 0.025 mol
Mass of potassium oxide needed in gram:
Mass = number of moles × molar mass
Mass = 0.025 mol × 94.2 g/mol
Mass = 2.355 g
Which of the following is used to break Water down to its elements:
A) Electricity
B) Pressure
C) Heat
D) Light
How many manganese atoms are in each formula unit of potassium permanganate?
Question 3(1 point)
A product taken orally that conains one or more ingredients that are intended to supplement one's diet and aren't considered food is called
оа
Ob
Oc
salmonella
dietary supplement
E Coli
dehydration
Od
Answer:
Group 8 is a group (column) of chemical elements in the periodic table. It consists of iron (Fe), ruthenium (Ru), osmium (Os) and hassium (Hs). They are all transition metals.
Explanation:
4.5cm wide by 5.750cm long by 1.50cm tall what is the volume of the box
Answer:
volume of box is 38.81 cm³.
Explanation:
Given data:
Width of box = 4.5 cm
Height of box = 5.750 cm
Length of box = 1.50 cm
Solution:
Formula:
Volume = length × height × width
by putting values,
V = 1.50 cm × 5.750 cm× 4.5 cm
V = 38.81 cm³
Thus, the volume of box is 38.81 cm³.
which terms means the loudness of sound?
A. volume
B. wavelength
C. medium
D. pitch
please help me it makes no sense!?
Explanation:
The answer is D, pitch.
How many total atoms does O have in Al2O2
Answer:
2
Explanation:
Find the mass in grams of 2.00 x 10^23 molecules of C10H15O
Answer:
119.13 g C10H15O
Explanation:
First you have to convert the molecules to moles-
2.00×10^23 molecules ( 1 mole/ 6.02×10^23 molecules)
Then convert the moles to grams (you will need a periodic table)
Looking at the periodic table, we see that C=12, H=1, and O=16
so if we add 15 O's, 10 C's and 1 H, we get 361 g.
0.33 moles ( 361 g/1 mole )= 119.13 g
1.- Escribe sobre la línea el nombre del grupo funcional al que pertenecen los siguientes compuestos. a.) CO2_____________ b).Na2O_______________ c). HgH____________ d.) HCl_____________ e.) Li OH______________ f.) H2sO4___________ ¿?
Answer:
Explanation:
Hola! ¿Cómo estás?
Los grupos funcionales se ocupan de la química orgánica y no de la química inorgánica. La química orgánica son los alcanos, alquenos, alquinos y otros. Lo que ha escrito allí como ejemplos no es química orgánica, sino química inorgánica. Eso hace que sea imposible encontrar su grupo funcional, ya que los elementos y compuestos inorgánicos no tienen grupos funcionales.
Yo espero que entiendes
Finely ground nickel (II) hydroxide is placed in a beaker of water. It sinks to the bottom of the beaker and remains unchanged. An aqueous solution of hydrochloric acid is then added to the beaker and the Ni(OH)2 disappears. Which reaction best describes what occurred in the beaker?
Your answer:
Ni(OH)2 (s) + HCl (aq) → NiO (aq) + H2 (g) + HCl (aq)
Ni(OH)2 (s) + 2 HCl (aq) → NiCl2 (aq) + 2 H2O (l)
Ni(OH)2 (s) + 2 H2O (l) → NiCl2 (aq) + 2 H2O (l)
Ni(OH)2 (s) + 2 H2O (l) → NiCl2 (aq) + 3 H2O (l) + O2 (g)
Explanation:
Acid-base reaction will give salt and water.
The 2nd option is correct.
The chemical equation Ni(OH)₂ (s) + 2 HCl (aq) → NiCl₂(aq) + 2 H₂O (l) represents what happened in the beaker as acid and base reaction gives salt and water.
What is chemical equation?
Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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At lower altitudes what does the troposphere have that is a major factor in the formation of weather?
A.) dust particles
B.) water vapor
C.) ozone layer
D.) the jet stream
Answer:
B - Water vapor
Explanation:
Tell me the main parts of the Earth Layers.
Answer:
Crust (the surface)
Upper Mantle (dense magma)
Lower Mantle (less dense magma)
Outer Core (pure liquid material)
Inner Core (dense material)
Hope that helps
Use the activity series below the predict the products of each of the following reactions. Do not worry about balancing the equations, CCl4 + Br2--? no reaction, CBr4 + Cl2
Answer:
1. a
2.b
Explanation:
is a chair an example of matter
Answer:
Yes.............
Explanation:
:)
if 2g of water is at 1C and a copper block at 3C is added to it, and the finall tempertature of mixture is 7 C , what is the mass of the copper?
Answer:
The APA rule for numbers is that you should begin a sentence with a word even if the number is greater than nine, and the word "percent" should also be used.
Explanation:
Please help make sure its correct thanks
The empirical formula of metal iodide : CoI₃(Cobalt(III) Iodide)
Further explanation13.02 g sample of Cobalt , then mol Co(MW=58.933 g/mol) :
[tex]\tt mol=\dfrac{mass}{Ar}=\\\\mol=\dfrac{13.02~g}{58.933}\\\\mol=0.221[/tex]
Mass of metal iodide formed : 97.12 g, so mass of Iodine :
[tex]\tt =mass~metal~iodide-mass~Cobalt\\\\=97.12-13.02\\\\=84.1~g[/tex]
Then mol iodine (MW=126.9045 g/mol) :
[tex]\tt \dfrac{84.1}{126.9045}=0.663[/tex]
mol ratio of Cobalt and Iodine in the compound :
[tex]\tt 0.221\div 0.663=1\div 3[/tex]
Please help Please Help
Answer:
1) false
2) true
3) true
4) false
5) false. I think
6) false
The fourth principal energy level has
Calculate the volume in L of 12.9 g of NO2 at STP.
46.0 L NO2
12.9 L NO2
26.5 L NO2
6.28 L NO2
Answer:
6.28 L
Explanation:
Given data:
Volume of NO₂ = ?
Mass of NO₂ = 12.9 g
Temperature and pressure = ?
Solution:
First of all we will calculate the number of moles of gas.
Number of moles = mass/molar mass
Number of moles = 12.9 g/ 46 g/mol
Number of moles = 0.28 mol
At standard temperature and pressure 1 mole of gas occupy 22.4 L volume.
Thus,
0.28 mol × 22.4 L/1 mol
6.27 L ≅ 6.28 L
2.5kg weighing cat climbing at the top of the tree has a potential energy of 986 J. Find the height.
Answer:
The height = 39.44 m
Explanation:
Given:
Mass m = 2.5 kg
Potential energy = 986 J
Find:
The height
Computation:
Potential energy = mgh
g = Acceleration due to gravity = 10 m/s²
986 = (2.5)(10)(h)
h = 39.44 m
The height = 39.44 m
What element is in period 1 group 8?
Answer:
Group 8 is a group (column) of chemical elements in the periodic table. It consists of iron (Fe), ruthenium (Ru), osmium (Os) and hassium (Hs). They are all transition metals.
Explanation:
The periodic chart has a group (column) of chemical elements called Group 8. Iron (Fe), ruthenium (Ru), osmium (Os), and hastium are the main elements (Hs). All of them are transitional metals.
What is a property of group 8 elements in periodic table?The Group 8A elements have very little ability to gain or lose electrons to form ions or share electrons with other elements in covalent bonds.
The number of valence electrons shared by elements belonging to the same group is constant. As a result, the physical and chemical properties of elements belonging to the same group are comparable.
The group 8 elements are suitable as cryogenic refrigerants because of their extremely low melting and boiling temperatures.
Therefore, iron (Fe), ruthenium (Ru), osmium (Os) and hassium (Hs) are elements of group 8.
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A sample of a gas occupies a volume of 35.0 L at 25°C and 4.50 atm. What is the volume
occupied by this gas at 20°C and 5.60 atm?
Answer:
The final volume, occupied by the gas at 20° C (293.15 K) and 5.60 atm, is approximately 27.65 L
Explanation:
The given parameters are;
The initial volume, V₁ = 35.0 L
The initial temperature, T₁ = 25 °C = 298.15 K
The initial pressure, P₁ = 4.50 atm
The final volume, V₂ = Required
The final temperature, T₂ = 20 °C = 293.15 K
The final pressure, P₂ = 5.60 atm
From the combined gas equation, we have;
P₁·V₁/T₁ = P₂·V₂/T₂
∴ V₂ = (P₁·V₁/T₁) × T₂/P₂
By substituting the known values, we get;
V₂ = (4.50 × 35.0/298.15) × 293.15/5.60 ≈ 27.65
Therefore, the final volume, occupied by the gas at 20° C (293.15 K) and 5.60 atm, V₂ ≈ 27.65 L
Describe three characteristics of the outer core and explain why the outer core is so important to humans on earth.
Answer:
The outer core is the only layer that is liquid. It is also mainly made from nickel and iron. The main job of the outer core is that it's responsible for the Earth's magnetic field. As the earth spins, the liquid inside this layer spins aswell, keeping it balanced.
Oxygen gas is esential for living beings why
Answer:
to turn food into energy
your brain need a lot of oxygen
play an important role in your immune system
