Answer:
e. 4.847 x 10-19 J
Explanation:
From the given information:
The equation connecting the photon energy and the wavelength is:
[tex]E_{photon } = \dfrac {hc}{\lambda}[/tex]
where;
[tex]planck's \ constant \ (h)[/tex]= 6.626 * 10 ^{-34} J.s
[tex]velocity \ of \ light \ (c)[/tex] = 3.00 * 10^8 m/s
wavelength [tex]\lambda = 410.1 \ nm \times \dfrac{10^{-9} \ m}{1 \ nm}[/tex]
[tex]\lambda = 4.101 \times 10^{-7} \ m[/tex]
To determine the photon energy of violet light
[tex]E_{photon } = \dfrac {(6.626 \times 10^{-34} J/s ) \times (3.00 \times 10^8 \ m/s) }{4.101 \times 10^{-7} \ m}[/tex]
= 4.847 × 10⁻¹⁹ J
Ethanol is a common laboratory solvent and has a density of 0.7890.789 g/mL. What is the mass, in grams, of 129129 mL of ethanol
Answer:
101.78 g
Explanation:
We know that density is given by; mass/volume
Mass = ?
Density = 0.789 g/ml
Volume = 129 ml
Mass = volume × density
Mass= 129 ml × 0.789 g/ml
Mass= 101.78 g
Probability can be used
Answer:
How likely something is to happen.
Is acne a physical or chemical change?
Answer:
A... Chemical change?
Explanation:
Im really sorry if this is wrong. Im d u m b
Describe two examples of something that has potential energy to do something
Answer: the heavy ball of a demolition machine is storing energy when it is held at an elevated position.
Which has potential energy
Explanation:
Answer: hope u dont mind i think ash answer ur question just imagine i had the correct answer woah UwU
Explanation:
An atom has 25 protons, 30 neutrons, and 25 electrons. What is the charge of the
atom's nucleus?
F +25
G +30
H -25
J -30
what are intermolecular forces
Please help me iv'e been stuck on it for 5 hours and it's science please help me and this better be worth it because i haven't been on brainly and i don't have much points rn so can someone please help me thank you
Answer:
1.)Elements
2.)Compound
3.)Subscript
4.)Formulas
Explanation:
Answer:
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Explanation:
The attractive forces between sodium and chloride ions are called:
a)Bonding Forces
b)Gravity Forces
c)Pulse Forces
d)Interparticle Forces
6. It took me 3 hrs to drive to the next city at the speed of 48km/h. How far a way are the cities?s
Answer:
speed = 16 kilometers per hour
= 16 km/h
Explanation:
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What is the mass of 4.5 moles of Cu(NO3)2?
Answer:
The mass of 4.5 moles of Cu(NO3)2 is 843.55g
Explanation:
Mass = moles x Molar mass
Mass = 4.50(187.55)
= 843.97g
How many moles are in 845 grams of Zn?
Answer:
12.92
Explanation:
Which of the following is NOT a property of metals associated with metallic bonds?
what are the following things
Metals are good conductors and shows some peculiarities such as luster, ductility, malleability,etc. Brittleness is not associated with metals since they are hard. Hence option A is correct.
What is metal?Metals are electropositive elements with good conductivity. Metals are classified into the s block and d block of periodic table. Thus alkali metals, alkaline earth metals and transition metals are the classes of metals.
Metals are rich in free electrons thereby, they capable of conducting electrically and thermally. Other features that metals have , they are hard and not brittle. Metals are malleable and ductile.
Malleability is the property by which it can be pressed into different shapes easily without cracking. Ductility means they can be plastically deformed into thin wires without fracture.
Metals are shining and this property is called lustrous. Hence all the properties such malleability, ductility and luster are features of metals but they are not brittle. Hence option A is correct.
To find more about metals, refer the link below;
https://brainly.com/question/18153051
#SPJ6
Your question is incomplete. But your complete question probably was:
Which of the following is NOT a property of metals associated with metallic bonds?
A Brittleness
B Malleability
C Ductility
D Luster
Question 2/5
The definite chemical composition of a mineral refers to
A. the mineral being created in a chemical laboratory
B. the number of elements from the periodic table that make up the mineral
C. the crystalline structure
D. the solid state of the mineral
What percent of AgNO3 is silver?
Answer:
63.499%
Explanation:
Turning _______ a switch completes the circuit.
Answer:
the blank is on.
Turning on a switch completes a circuit.
Explanation:
me need answer to da question
Answer:
cells?
Explanation:
How many moles of calcium atoms are in each mole of calcium carbonate?
1 mole of CaCO3 = 100.086 g
Answer:
The number of moles of calcium atom in each mole of calcium carbonate is 1 mole of calcium atoms
Explanation:
The chemical formula for CaCO₃ = 100.086 g
The number of molecules in one mole of a substance is given by the Avogadro's number, [tex]N_A[/tex] = 6.022 × 10²³ molecules
The number of calcium atoms in one molecule of CaCO₃ = 1 atom of calcium
Therefore, the number of calcium atoms in 1 mole of CaCO₃ = 1 × 6.022 × 10²³ atoms of calcium = 6.022 × 10²³ atoms of calcium
6.022 × 10²³ atoms of calcium = The number of toms in 1 mole of calcium atoms
Therefore, the number of moles of calcium atom in each mole of calcium carbonate = 1 mole of calcium atoms.
If a piece of matter changes shape, how does its mass change?
A.It increases.
B.It decreases.
C.It changes randomly.
D.It remains the same.
PLEASE HELP!!
How many molecules are in 0.45 moles of aluminum metal ?
Answer:
There are 2.7× 1023atoms in 0.45 mol of Al.
Explanation:
Answer:
do not care
Explanation:
What is the specific heat of a 123 g substance that requires 4.56 J of heat in
order to increase its temperature by 12.32 °C?
A) 0.00301 J/g °C
B) 0.457 J/g °C
0 6910 J/g °C
D) 2.19 J/g °C
E) 0.0220 J/g°C
Answer: A. [tex]0.00301J/g^0C[/tex]
Explanation:
The quantity of heat required to raise the temperature of a substance by one degree Celsius is called the specific heat capacity.
[tex]Q=m\times c\times \Delta T[/tex]
Q = Heat absorbed = 4.56 J
m = mass of substance = 123 g
c = specific heat capacity = ?
Change in temperature ,[tex]\Delta T=T_f-T_i=12.32^0C[/tex]
Putting in the values, we get:
[tex]4.56J=123g\times c\times 12.32^0C[/tex]
[tex]c=0.00301J/g^0C[/tex]
The specific heat of a 123 g substance that requires 4.56 J of heat in order to increase its temperature by 12.32 °C is [tex]0.00301J/g^0C[/tex]
Write 8.76 x 103 in standard
notation
Plzzz hurry!!!
Answer:5.02228
Explanation: My bad I put it in scientific notation not standard. Sorry. Heres the right answer
Which statement below is not part of the cell theory? a. All living things have many cells b All living things are made of one or more cells c cells are the basic unit of structure and function in living things d All cells come from other cells
Answer:
c
Explanation:
I know it's c because I have done the test
Given the balanced equation:
2NO2 —————->N2O4
what mass in grams of n2o4 is produced when 10 moles of no2 is consumed?
a) 153 b) 690 c) 368 d) 460 e) 1150
Answer:
d) Mass = 460 g
Explanation:
Given data:
Mass of N₂O₄ produced = ?
Number of moles of NO₂ consumed = 10 mol
Solution:
2NO₂ → N₂O₄
Now we will compare the moles of NO₂ and N₂O₄.
NO₂ : N₂O₄
2 : 1
10 : 1/2×10 = 5 mol
Mass of N₂O₄ produced:
Mass = number of moles × molar mass
Mass = 5 mol × 92 g/mol
Mass = 460 g
A chemist describes a particular experiment in this way: "0.0400 mol of H2O2 decomposed into 0.0400 mol of H2O and 0.0200 mol of O2." Express the chemistry of this reaction by a conventional equation.
What do oxygen and iron make?
Answer:Iron combines with oxygen to produce rust, which is the compound named iron oxide
Explanation:
Hi could you please help, i have a test today which will determine my grade
Acid solutions contain hydrogen ions.
Aluminium reacts with dilute hydrochloric acid to form a solution containing aluminium ions Complete the balanced ionic equation for this reaction
Explanation:
the answer is in the attachment
Calculate the mass of 140g of Cl2
Answer:
6amu
Explanation:
mass=proton+neutron
mass of cl2=2(16+16)=64amu
can someone answer this question?
Answer:
what is the question i could help if u gave me the question but i don't see it
Explanation:
A student wrote a chemical equation as shown.
Fe2O3 + 3H2 → Fe + H2O
What should the student do to balance the equation?
A. Add a coefficient 2 before Fe and a 3 before H2O
B. Add a coefficient 3 before Fe and a 2 before H2O
C. Add a coefficient 4 before Fe and a 5 before H2O
D. Add a coefficient 5 before Fe and a 4 before H2O
Answer:
A
add a coefficient 2 before Fe and a 3 before H2O
Answer:
Option A. Add a coefficient 2 before Fe and a 3 before H2O
Explanation:
Fe₂O₃ + 3H₂ —> Fe + H₂O
The above equation can be balance by as follow:
Fe₂O₃ + 3H₂ —> Fe + H₂O
There are 2 atoms of Fe on the left side and 1 atom on the right side. It can be balance by putting 2 before Fe as shown below:
Fe₂O₃ + 3H₂ —> 2Fe + H₂O
There are 3 atoms of O on the left side and 1 atom on the right side. It can be balance by putting 3 before H₂O as shown below:
Fe₂O₃ + 3H₂ —> 2Fe + 3H₂O
Now the equation is balanced.
Thus, the student should add a coefficient 2 before Fe and a 3 before H2O
Calcium reacts with Hydrochloric acid to produce Calcium chloride and
Hydrogen gas. If we start with 2 g of Hydrochloric acid, how many grams
of Calcium Chloride will we produce?
Answer:
Mass = 2.77 g
Explanation:
Given data:
Mass of HCl = 2 g
Mass of CaCl₂ produced = ?
Solution:
Chemical equation:
2HCl + Ca → CaCl₂ + H₂
Number of moles of HCl:
Number of moles = mass / molar mass
Number of moles = 2 g/ 36.5 g/mol
Number of moles = 0.05 mol
now we will compare the moles of HCl with CaCl₂.
HCl : CaCl₂
2 : 1
0.05 : 1/2×0.05 = 0.025 mol
Mass of CaCl₂:
Mass = number of moles × molar mass
Mass = 0.025 mol × 110.98 g/mol
Mass = 2.77 g
