Answer:
going without without masks is like to play with a dirty things which is very undesired and unwanted .corona virus is very serious world wide epidemic which is surrounded in all region due to our carelessness many lives are taken due to our carelessness. so please wear mask and maintain social distance to fight against all types of communicable diseases. I hope please be rational and aware.
Answer:
Hola porfa ayudame si podes
Calculate the energy of a photon emitted when an electron in a hydrogen atom undergoes a transition from =3 to =1.
Answer:
[tex]1.936\times 10^{-18}\ \text{J}[/tex]
Explanation:
[tex]R_h[/tex] = Rydberg constant = [tex]2.178\times 10^{-18}\ \text{J}[/tex]
[tex]n_i[/tex] = Initial shell = 3
[tex]n_f[/tex] = Final shell = 1
We have the relation
[tex]\Delta E=R_h(\dfrac{1}{n_f^2}-\dfrac{1}{n_i^2})\\\Rightarrow \Delta E=2.178\times 10^{-18}(\dfrac{1}{1^2}-\dfrac{1}{3^2})\\\Rightarrow \Delta E=1.936\times 10^{-18}\ \text{J}[/tex]
The energy of the photon emitted here is [tex]1.936\times 10^{-18}\ \text{J}[/tex].
What is mass in grams of 2.30 moles of Aluminum?
62.1 g Al
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableStoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
2.30 mol Al
Step 2: Identify Conversions
[PT] Molar Mass of Al - 26.98 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 2.30 \ mol \ Al(\frac{26.98 \ g \ Al}{1 \ mol \ Al})[/tex]Multiply/Divide: [tex]\displaystyle 62.054 \ g \ Al[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
62.054 g Al ≈ 62.1 g Al
write and balance the cellular respiration equation of glucose compared with the photosynthesis reaction in the terms of reactants products energy flow in the significance of each.
Answer:
Explanation:
.
list six molecules in the reactions in the table & six ionic compounds in the reactions in the table above.
Explanation:
Ionic Compounds: These are compounds that contain ionic bonds. Generally, they are compounds that consists of a metal bonded to a nonmetal. Examples includes;
- CaO
- AgCl
- KCl
- CaI₂
- AgNO₃
- KClO₃
Molecules: They typically contain the covalent bonds. Generally, they are non metals bonded to each other.
Examples Includes;
- H₂
- C₂H₄
- N₂
- NH₃
- Cl₂
- I₂
whats the balance to Sr + O, SrO
Answer:
SrO = Sr + O - Chemical Equation Balancer.
Explanation:
What is the amount of diamine silver that can be formed when 10.00 g AgCl is mixed with 1.00 L of 0.100 M NH3?
The amount of diamine silver chloride = 8.87 g
Further explanationGiven
10 g AgCl
1.00 L of 0.100 M NH3
Required
the amount of diamine silver
Reaction
AgCl + 2 NH₃ → [Ag(NH₃)₂]Cl
mol AgCl :
= mass : MW
= 10 g : 143,32 g/mol
= 0.0698
mol NH₃ :
= M x V
= 0.1 x 1
= 0.1
NH₃ as a limiting reactant
mol [Ag(NH₃)₂]Cl based on NH₃ :
= 1/2 x mol NH₃
= 1/2 x 0.1
= 0.05
Mass diamine silver :
= 0.05 x 177.3822 g/mol
= 8.87 g
help for brainlist and extra points!!
Answer:
Explanation:
c.
This mineral can be scratched with a fingernail.
Fluorite
0 Gypsum
Quartz
Pretty sure it’s gypsum.
Plzzzzz helpppp meee
Answer:
2 and 5
Explanation:
KMnO4 + H2S + HCl KCl + MnCl2 + H2O + S8 Did Cl change oxidation number? Yes, no Did Oxygen change oxidation number? Yes, no Did H change oxidation number? Yes, no Did Mn change oxidation number? Yes, no Did S change oxidation number? Yes, no oxidizing agent = K, O, Mn, S reducing agent = Mn, H, Cl, S
Explanation:
KMnO4 + H2S + HCl --> KCl + MnCl2 + H2O + S8
Did Cl change oxidation number?
The oxidation number of Cl in Reactant side is -1
The oxidation number of Cl in product side is -1
NO
Did Oxygen change oxidation number?
The oxidation number of O in Reactant side is -2
The oxidation number of O in product side is -2
NO
Did H change oxidation number?
The oxidation number of H in Reactant side is 1
The oxidation number of H in product side is 1
NO
Did Mn change oxidation number?
The oxidation number of Mn in Reactant side is +7
The oxidation number of Mn in product side is +2
YES
Did S change oxidation number?
The oxidation number of S in Reactant side is -2
The oxidation number of S in product side is 0
YES
Oxidizing agent (element with decrease in oxidation number) = Mn
Reducing agent (element with Increase in oxidation number) = S
The atoms in a sample are close together but can side past one another. As the atoms lose energy, they move slower. The atoms become locked in place because of attractive forces between them.
Which change of state is taking place
Gas to solid
Gas to liquid
Liquid to solid
Solid to liquid
Which substance can form a coordinate covalent bond with a hydrogen ion?
a. H2
b. He
c. NH3
d. CH4
The substance can form a coordinate covalent bond with a hydrogen ion is He. Hence, option B is correct.
What is covalent bond ?An electron exchange that results in the formation of electron pairs between atoms is known as a covalent bond. Bonding pairs or sharing pairs are the names given to these electron pairs.
Covalent bonding is the stable equilibrium of the attractive and repulsive forces between atoms when they share electrons.
Covalent bonds were first described in 1939. The word "covalent bond" is derived from the prefix co-, which means jointly, associated in action, partnered to a lesser extent, etc. The hydrogen atoms share the two electrons through covalent bonding since the prefix co- implies jointly, associated in action, etc.
Thus, option B is correct.
To learn more about covalent bond, follow the link;
https://brainly.com/question/10777799
#SPJ2
what is the name of the compoud H2Co2
Explain in terms of atomic structure, why cesium has a lower first ionization energy than rubidium. Determine the family/group in which each element is located
Answer:
Explain in terms of atomic structure, why Cesium (Cs) has a LOWER first ionization energy than Rubidium (Rb). Cesium is further down on the periodic table. ... The ion K+1 has one more electron than the atom K. K+1 has lost one electron from its valence shell, and therefore has one less electron shell than K.
Explanation:
Radium contains the most electron shells, which creates a shielding effect that reduces the ionization energy.
Radium:
[tex][Rn]7 S^2[/tex] Layer atomic radiusCalcium:
[tex][Ar]4S^2[/tex] Smaller atomic radiusA higher proportion of electron shells creates a shielding effect, resulting throughout a decreased zeff as well as easier ionization of the outermost election.
Learn more:
https://brainly.com/question/14467776
A cylinder of an ideal gas contains 1.2 moles of gas and occupies a volume of 5.0L. If 0.5 moles of a second gas are added to the cylinder, and the cylinder is allowed to expand until it reaches the same temperature and pressure as before, what is the final volume of gas, in liters, that occupies the cylinder?
Answer:
7.08 L
Explanation:
From the question given above, the following data were obtained:
Initial mole (n₁) = 1.2 moles
Initial volume (V₁) = 5 L
Final mole (n₂) = 1.2 + 0.5 = 1.7 moles
Final volume (V₂) =?
From ideal gas equation,
PV = nRT
Divide both by n
PV / n = RT
Divide both side by P
V / n = RT/P
RT/P => constant
Therefore,
V₁ / n₁ = V₂ / n₂
With the above formula i.e
V₁/n₁ = V₂/n₂
We can obtain the final volume of the gas as follow:
Initial mole (n₁) = 1.2 moles
Initial volume (V₁) = 5 L
Final mole (n₂) = 1.7 moles
Final volume (V₂) =?
V₁/n₁ = V₂/n₂
5 / 1.2 = V₂ / 1.7
Cross multiply
5 × 1.7 = 1.2 × V₂
8.5 = 1.2 × V₂
Divide both side by 1.2
V₂ = 8.5 / 1.2
V₂ = 7.08 L
Therefore, the final volume of the gas is 7.08 L
Could someone please help me? You can ignore number 3:)
Answer:
Question 2: Because the elements could be unstable, forming elemental compounds.
Question 1: Water is made up of Hydrogen and oxygen, which is namely called H2^o What makes it a pure substance is the little mass and molecules it's made up of.
Could someone please help me? You can ignore number 3
For Number 2)
THE ELEMENTS TEND TO FORM COMPOUNDS BECAUSE AOMS ARE UNSTABLE AND CAN SHARE ELECTRONS IN THIER OUTER ENERGY LEVELS .
AS WE KNOW, ATOMS OF AN ELEMENT BECOMES MORE STABLE BY LOSING , GAINING AND SHARING ELECTRONS.
Elements react with each other to complete their octet or duplet so as to become stavle in nature. For e.g. Carbon reacts with oxygen to form carbon dioxide. Carbon reacts with four molecules of hydrogen to form methane - CH4.
13.Which shows the order of increasing ionization energy?
a.Si, Al, Mg, Na
b.Ga, Ge, As, Se
c.Be, Mg, Ca, Sr
d.F, Cl, Br, I
By counting the number of crests that pass by a given point in a set amount of time, what you would be calculating?
Answer:
Frequency
Explanation:
When we talk about crests, we are referring to the high points of a wave.
We measure wave frequency by counting out the the number of crests (or high points) of a given wave that pass by a given point in a set amount of time. Thus, the higher the number of crests, the greater the frequency of the wave and vice versa.
We define the frequency of a wave as the number of waves that passes by a fixed point within a given period of time.
Please help. I’m stuck
What are the three energy's .
Answer:
Energy and how it can change forms. Kinetic, potential, and chemical energy.
A patient needs to take 875mg twice daily The pills in the bottle are each 250mg How many pills does she wants to take 875mg
Answer:
[tex]3.5[/tex] pill need to taken for completing dosage of [tex]875[/tex] mg
Explanation:
Total dosage of medicine to be taken in a day
[tex]= 2 * 875 \\= 1750[/tex]mg
Total weight of one pill [tex]= 250[/tex] mg
Number of pills required is equal to total dosage of medicine divided by the weight of one pill.
Hence,
Number of pills
[tex]= \frac{875}{250} \\= \frac{175}{50} \\= \frac{35}{10} \\= 3.5[/tex]
how many elements are in 4K2CO3
Answer: 3 elements
Explanation:
They are
K for Potassium, C for Calcium and O for Oxygen
A chemist weighed out 2.9 g of nickel. Calculate the number of moles of nickel she weighed out. Be sure your answer has the correct number of significant digits.
Answer:moles = 2.9 g Ni × 1 mol Ni 58.69 g Ni = 0.0663 mol Ni
If you have 15g of sodium carbonate, what
mass of sodium is present in that sample?
Answer: 6.75 g
Explanation:
the first element was full brittle and did not conduct heat
Answer:
non-Metals
Explanation:
New rocks are heavier than old rocks.
Something used to power some devices.
Answer:
electricity
Explanation:
or maybe food
Where is the air pressure greater-- at sea level or on a mountaintop? Explain
Answer:
Air pressure is greater at sea level than at the top of a mountain. The amount of air at sea level is greater than that on top of a mountain.
Explanation:
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what is light energy
Answer:
Light energy is a form of electromagnetic radiation.
Explanation:
Light consists of photons, which are produced when an object's atoms heat up. Light travels in waves and is the only form of energy visible to the human eye.