Answer:
E = 45.08×10⁻¹⁹j
Explanation:
Given data:
Energy of photon in joule = ?
Frequency of photon = 6.8×10¹⁵ Hz
Solution:
Formula:
E = h.f
f = frequency
h = planck's constant (6.63×10⁻³⁴Js)
E = energy
Value of planck's constant is 6.63×10⁻³⁴Js.
E = 6.63×10⁻³⁴Js ×6.8×10¹⁵ Hz
Hz = s⁻¹
E = 6.63×10⁻³⁴Js ×6.8×10¹⁵ s⁻¹
E = 45.08×10⁻¹⁹j
Energy is the quantitative unit, which is measured in joules. The energy of a photon of UV light having the frequency 6.8×10¹⁵ Hz is 45.08×10⁻¹⁹ Joules.
Given:
Frequency of photon = 6.8×10¹⁵ Hz
Energy of a photon in joule =?
Usingt the formula of energy:
E = h x v
where,
v = frequency
h = planck's constant (6.63×10⁻³⁴Js)
E = energy
Substituting the values in the equation, we get:
E = 6.63×10⁻³⁴Js ×6.8×10¹⁵ Hz
E = 6.63×10⁻³⁴Js ×6.8×10¹⁵ s⁻¹
E = 45.08×10⁻¹⁹ Joules
Therefore, the energy of a photon in the UV region is 45.08×10⁻¹⁹ Joules
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Which of the following is a correctly written chemical equation that demonstrates the conservation of mass?
O A. H2 + O2 + H2O
B. Mg + HCl + H2 + MgCl2
C. KC 103 → KC1 + O2
OD. H2O + CO2 + H2CO3
Answer:
Option D is correct.
H₂O + CO₂ → H₂CO₃
Explanation:
First of all we will get to know what law of conservation of mass states.
According to this law, mass can neither be created nor destroyed in a chemical equation.
This law was given by French chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.
Example:
6CO₂ + 6H₂O + energy → C₆H₁₂O₆ + 6O₂
there are six carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of equation so this reaction followed the law of conservation of mass.
Now we will apply this law to given chemical equations:
A) H₂ + O₂ → H₂O
There are two hydrogen and two oxygen atoms present on left side while on right side only one oxygen and two hydrogen atoms are present so mass in not conserved. This equation not follow the law of conservation of mass.
B) Mg + HCl → H₂ + MgCl₂
In this equation one Mg, one H and one Cl atoms are present on left side while on right side two hydrogen, one Mg and two chlorine atoms are present. This equation also not follow the law of conservation of mass.
C) KClO₃ → KCl + O₂
There are one K, one Cl and three O atoms are present on left side of chemical equation while on right side one K one Cl and two oxygen atoms are present. This equation also not following the law of conservation of mass.
D) H₂O + CO₂ → H₂CO₃
There are two hydrogen, one carbon and three oxygen atoms are present on both side of equation thus, mass remain conserved. Thus is correct option.
The chemical reaction that follows the conservation of mass has been the formation of hydrogen carbonate. Thus, option D is correct.
The conservation of mass states that the mass of the reactant and products has been equal. The mass can be calculated in terms of the number of atoms.
(A) [tex]\rm H_2\;+\;O_2\;\rightarrow\;H_2O[/tex]
The number of atoms of Hydrogen:
Reactant = 2
Product = 2
The number of atoms of Oxygen:
Reactant = 2
Product = 1
The number of atoms of products and reactant is not equal, Thus, the reaction did not follow the conservation of mass.
(B) [tex]\rm Mg\;+\;HCl\;\rightarrow\;H_2\;+\;MgCl_2[/tex]
The number of atoms of Mg:
Reactant = 1
Product = 1
The number of atoms of H:
Reactant = 1
Product = 2
The number of atoms of Cl:
Reactant = 1
Product = 2
The number of atoms of products and reactant is not equal, Thus, the reaction did not follow the conservation of mass.
(C) [tex]\rm KClO_3\;\rightarrow\;KCl\;+\;O_2[/tex]
The number of atoms of K:
Reactant = 1
Product = 1
The number of atoms of Cl:
Reactant = 1
Product = 1
The number of atoms of O:
Reactant = 3
Product = 2
The number of atoms of products and reactant is not equal, Thus, the reaction did not follow the conservation of mass.
(D) [tex]\rm H_2O\;+\;CO_2\;\rightarrow\;H_2CO_3[/tex]
The number of atoms of H:
Reactant = 2
Product = 2
The number of atoms of O:
Reactant = 3
Product = 3
The number of atoms of C:
Reactant = 1
Product = 1
The number of atoms of products and reactant is equal, Thus, the reaction follows the conservation of mass.
The chemical reaction that follows the conservation of mass has been the formation of hydrogen carbonate. Thus, option D is correct.
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Convert the following number into scientific notation: 88,000,000.
A 8.8 x 10⁶
B. 88 x 10⁴
C 8.8 x10⁷
D. 8.8 x 10-⁷
HURRY ⚠️
How many Chlorine atoms in 2HCI?
Hiw many Hydrogen atoms are in 2HCl?
Answer:
2 in each
Explanation:
What are the particles that are found in the nucleus of an atom
Answer:
Protons and Neutrons
Explanation:
how many carbon atoms are in C6H14N4O2
a.4
b.2
c.6
d.14
Answer:
6
Explanation:
Answer:
6
Explanation:
C6
Carbon 6
Photosynthesis occurs in
the mitochondria
chloroplast
A compound such as CaCl, would have an overall charge of?
Calcium Chloride would have a charge of +2
Hopes this helps :)
Group/Family
Noble gases
Metals
Nonmetals
Halogens
Metalloids
Period
1.
A
2.
B
3.
C
4.
D
5.
E
6.
F
7.
G
Answer:
1. Metals
2. Metaloids
3. Non-Metals
4. Alkali Metals
5. Transition Metals
6. Halogens
7. Noble Gases
5. Complete and balance an equation for each reaction:
CaI₂ + Hg(NO₃)₂ ---------> (HgI₂ precipitates)
Al + Cl₂ --------->
Ag + HCl ------->
C₂H₂ + O₂ ------->
MgCl₂ --------->
CaI₂ + Hg(NO₃)₂ --------->HgI₂ + Ca(NO3)2
2Al + 3Cl₂ --------->2AlCl3
Ag + HCl ------->AgCl + H2
C2H2 + 5O2 --------> 4CO2 + 2H2O
MgCl₂ --------->Mg + Cl2
Which is another name for groups of elements?
Answer:
another name for groups of elements is family.
Answer: The Periodic Table of Elements
Explanation: The Periodic Table of Elements is a table with different elements arranged in an order, usually in vertical rows of two.
Add a neutron to create carbon-13. Is this isotope stable or radioactive?
Write the chemical formula for Calcium Dichromate
Ca Cr2O7^2 -
2 2
2 2
1 1
=CaCr2O7^2 -
Is this right? Or does the second part have a bracket
Answer:
Its right
Explanation:
The chemical formula of calcium dichromate is CaCr207
Pleaseee help meeeeeee
Answer:B
Explanation:
Heat boils it will get hot no heat/cold will freeze
Why would heating up the human body be a bad choice for causing a chemical reaction?
Answer:
Explained below
Explanation:
The human body has a normal core temperature of around 37°C to 38°C.
Now, if it is heated up to say 39° to 40°C, fatigue will start to set in and the brain begins to tell the muscles to slow down.
If it's now heated to higher temperatures above above 41°C, the body will begin to experience heat exhaustion and therefore will start to shut down.
Due to this process, the body can't even sweat at that stage because blood flow to the skin will stops thereby making the body feel cold and clammy. Thus, chemical processes/reaction in the body will begin to be affected and the cells inside the body will start to deteriorate and thus there is now a huge risk of having multiple organ failure.
Fill in the blank. The amount which an object accelerates
depends on the mass of the object and on the size of the
acting upon it.
gravity
velocity
inertia
force
Answer: the answer is force
Explanation:
is the amount of
matter in an object.
Group of answer
choices
Weight
Volume
Density
Dough
Earth is approximately 149,600,000 kilometers away from the sun. How would this distance be expressed in scientific notation?
Answer:
bo
Explanation:
I dont know nothing cuz am that smart and yes am cool wait I have to wait 67 seconds am not done answering you questions I will be back in a few....
The model of a neutral element is shown below. Which particle determines the reactivity of the element?
A
B
C
D
48 points
Chemistry is the study of 1.
& its interactions. Matter has
2.___, takes up 3. ____& is made up of 4.____
from the
periodic table. Each element in the periodic table has a different
5. ____structure. You can use the information in the periodic square of
each element to model its basic atomic structure. The three subatomic
particles that make up atoms are the 6. ___charged protons & the
7. ____neutrons are both located in the nucleus, & the 8.____
charged electrons are found orbiting the nucleus. The element's
9. ____number is equal to the number of protons, & identifies the
element. The element's atomic mass is equal to the number of protons
plus neutrons in the 10.____
The atomic charge on atoms in the
periodic table is 11. ____; so the number of electrons in a neutral atom
is also equal to the 12. ____number. Charged atoms are called
13. ____If an atom looses an electron from its neutral state it becomes a
positively charged 14. ____If an atom gains an electron it becomes a
negatively charged 15. ____Atoms with a different number of
neutrons are called 16.___
and they also differ in mass. *
Answer:
1. Matter
2. Mass
3. Space/Volume
4. Substances
5. Atomic
6. Positively
7. Neutrally charged
8. Negatively
9. Atomic
10. Nucleus
11.
12. Atomic
13. Ions
14. Cation
15. Anion
16. Isotopes
Answer:
Give that person Brainly now :)
Explanation:
It is made up of two or more compounds is it mixture
or compound?
Answer:
mixture
Explanation:
Put the substance in a 25 mL beaker.
Click the beaker to get a closer look.
Now, observe and record the following:
- state of matter:
- appearance and texture:
- crystalline structure:
Answer:
1.) Liquid
2.) Powder
3.) No ( Not A Solid)
Explanation:
When substance put in a 25 mL beaker. than state of matter will be solid , appearance and texture will be powdered and crystalline structure will be powdered.
What is state of matter?A state of matter was one of many different shapes that matter can take. In daily life, four states of matter were visible: solid, liquid, gas, but also plasma.
What is crystalline structure?
The organized configuration of atoms, ions, and even molecules in such a crystalline material is usually referred to as crystalline structure.
Therefore,
state of matter = solidappearance and texture = powderedcrystalline structure = not solidTo know more about state of matter.
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Sara slides down a playground slide. How will friction affect her as she slides?
Answer:
Friction is a force that occurs whenever two objects rub against each other, such as a slide and a person's backside. Without friction, a slide would accelerate the rider too quickly, resulting in possible injury. Certain materials called lubricants can reduce the effects of friction. This is why water park slides are much faster than playground slides; the water acts as a lubricant. Sitting on wax paper can also reduce the amount of friction.
Explanation:
1. Any atom that is electrically neutral must contain -
Answer:
The same number of electrons and protons.
Explanation:
Because a proton has a charge of +1 and an electron has a charge of -1, the ratio of protons to electrons must be 1:1 for the atom to be neutral.
Use this formula: Q=(m)(∆T)(Csp), where Q is heat (what you’re solving for), m is mass in grams (g), ∆T is the change in temperature (ending temp. minus beginning temp.) in degrees Celsius (∘C), and Csp is the specific heat capacity in joules per gram per degree(J/g ∘C). The answer will be in joules of energy (J).
Just multiply all three quantities given in the text together (as it shows in the formula!) to get Q. But remember, you have to figure out the change in temperature (like 10 ∘C to 50 ∘C is a change of 40 ∘C).
1. A calorimeter holds 75 g water at 26°C. A sample of hot copper is added to the water. The final temperature of the water and copper is 39°C. What is the change in enthalpy associated with the change in the water’s temperature? The specific heat capacity of water is 4.19 J/g°C.
2. A chemist heats a 215-g sample of iron from 25.0°C to 90.0°C. How much heat did the iron absorb? The specific heat capacity of iron is 0.45 J/g°C.
1. Q = 4085.25 J
2. Q = 6288.75 J
Further explanationHeat can be calculated using the formula:
Q = mc∆T
A calorimeter is a device used to measure the specific heat of material
1. mass of water : m= 75 g
T1 = 26°C
T2 = 39°C
Csp = 4.19 J/g°C.
[tex]\tt Q=m.c.\Delta T\\\\Q=75\times 4.19\times (39-26)\\\\Q=4085.25~J[/tex]
2.mass of iron = 215 g
T1 = 25°C
T2 = 90°C
Csp = 0.45 J/g°C.
[tex]\tt Q=m.c.\Delta T\\\\Q=215\times 0.45\times (90-25)\\\\Q=6288.75~J[/tex]
The variable placed on the horizontal or x-axis of a graph is what variable
Answer:
Independent variable
Explanation:
Fog is composed of water droplets in air. Which term describes fog? A. solution B. colloid C. suspention D. solvent
Answer:
colloid
Explanation:
Colloid is a type of fog
Answer:
colloid
Explanation:
I got it right on egd
why can liquids not be compressed easily
Answer :The reason why compression is more difficult is a direct illustration of quantum mechanics.
In the compound nickel(II) sulfide, there is always 58.7 g of nickel for every 32.1 g of sulfur. What is the simplified ratio of
nickel to sulfur?
answer: 1.83 to 1
or at least that’s what i got
8. Calculate the mass of 3.47x 1023 gold atoms.
Answer:
the answer is 1.227
Plants use sunlight as energy to convert carbon dioxide and water into glucose and oxygen. Which best describes the
reaction?
O The law of conservation of mass indicates the same amount of carbon will be found in the reactants as in the
products.
O The law of conservation of energy indicates the same amount of carbon will be found in the reactants as in the
products,
The law of conservation of mass indicates the same amount of glucose will be found in the reactants as in the
products.
The law of conservation of energy indicates the same amount of glucose will be found in the reactants as in the
products.
Answer:
A
Explanation:
Question:
Plants use sunlight as energy to convert carbon dioxide and water into glucose and oxygen. Which best describes the reaction?
Options:
The law of conservation of mass indicates the same amount of carbon will be found in the reactants as in the products. The law of conservation of energy indicates the same amount of carbon will be found in the reactants as in the products. The law of conservation of mass indicates the same amount of glucose will be found in the reactants as in the products. The law of conservation of energy indicates the same amount of glucose will be found in the reactants as in the products.Answer:
A.) The law of conservation of mass indicates the same amount of carbon will be found in the reactants as in the products.
Explanation:
I just did the test on edge 2020 and got it right!