Answer:
E = 8.84×10⁻¹⁷ J
Explanation:
Given data:
Wavelength of wave = 2.25 nm (2.25×10⁻⁹ m)
Energy of wave = ?
Solution:
Formula:
E = hc/λ
c = 3×10⁸m/s
h =6.63 ×10⁻³⁴ Js
now we will put the values,
E = 6.63 ×10⁻³⁴ Js × 3×10⁸m/s / 2.25×10⁻⁹ m
E = 19.89×10⁻²⁶ Jm / 2.25×10⁻⁹ m
E = 8.84×10⁻¹⁷ J
A mixture is a combination of
I give Brainly
I need the answer now plz
two or more pure substances in
which each pure substance retains
its individual chemical properties.
A mixture is physically, not
chemically, combined.
Example: salt and sugar
combined together in a bowl
I need 2 more examples
Answer:
Sand and water
Oil and sand
Explanation:
A mixture, has rightly stated in this question, is a substance composed of two or more substances combined physically rather than chemically. In a mixture, each constituent retains its chemical properties i.e. the chemical properties of none of the substances in a mixture is altered. This serves as the basis for the physical separation of a mixture.
One example of mixture has been given in this question i.e salt and sugar combined together in a bowl. This represent a mixture because the sugar is not chemically combined to the salt, hence, each can easily be separated. This is the same for any other mixtire. More examples include:
Sand and water
Oil and sand
Salt and water (salt solution)
Petroleum or crude oil
how many sigma bonds and pi bonds are in limonene
Answer:
6 sigma and 1 pi
Explanation:
Please help me I need an answer ASAP
Choose the mole ratio below that is INCORRECT based on the given balanced equation:
2 C2H5OH + 7 O2 --> 4 CO2 + 6 H2O
O 2 moles C2H5OH = 4 moles CO2
O 7 moles O2 = 2 moles C2H5OH
O 4 moles CO2 = 4 moles O2
O 6 moles H2O = 7 moles O2
Answer:
4 moles CO₂ = 4 moles O₂
Explanation:
The reaction equation is given as;
2C₂H₅OH + 7O₂ → 4CO₂ + 6H₂O
The incorrect mole ratio from the relationships shown is;
4 moles CO₂ = 4 moles O₂
Number of moles of CO₂ = 4
Number of moles of O₂ = 7
So, the right expression is;
4 moles CO₂ = 7 moles O₂
Four cats are sitting in a living room. Which cat has the greatest gravitational potential energy? (Lesson 3.10 Gravitational Potential Energy)
Question 1 options:
A 15 lb cat sitting 1 foot off the ground on a box
A 15 lb cat sitting 3 feet off the ground in a window
A 10 lb cat sitting 1 foot off the ground on a box
A 10 lb cat sitting 3 feet off the floor in a window
Answer:
I believe it is the first option.
Answer:
I believe it is "A 15 lb. cat sitting 3 feet of the ground in the window"
Explanation:
I think it is this one because it is one off the heaviest cats and it is this one because this 15 pound cat is higher than the other one. I hope you get an A
What is the Delta.Hf for this reaction? 16CO2(g) + 18H2O(g) Right arrow. 2C8H18(l) + 25O2(g)
Answer: The Hrxn for the reaction C(s) + O2(g) -> CO2(g) is the same as the Hf for CO2(g).
The Hf for Br2(l) is 0 kJ/mol by definition
The Hrxn for the reaction 1.5H2(g) + 0.5N2(g) -> NH3(g) is the same as the Hf for NH3(g).
Explanation:
Answer:
10,148
Explanation:
Which statement best describes SARS? SARS was an epidemic, but not a pandemic. SARS was a pandemic, but not an epidemic. SARS was both a pandemic and an epidemic. SARS was neither a pandemic nor an epidemic
Answer:
SARS was an epidemic, but not a pandemic.
Explanation:
It is correct to say SARS was an epidemic but not a pandemic.
An epidemic is an outbreak of infectious diseases which affects a group of people in a particular areasA pandemic is a global outbreak of diseases that affects the total population of people over a wider range.SARS outbreak occurred between 2002 - 2004 in China. It was localized to the People's republic and hence, an epidemic.
The recent outbreak of disease in 2020 on the other hand is a pandemic. The infectious disease had a global coverage.
Answer:
sars was an epidemic , but not an pandemic
Explanation:
What kind of energy makes your hair frizzy
Answer:
electricity
Explanation:
static hair occurs when your hair builds up an electric charge
wjat is 0.06m to cm
Answer:
6 cm
Explanation:
What is a simulation? Why are simulations helpful to scientists?
Answer:
A simulation is an imitation. Simulations are helpful to scientists because they allow scientists to study occurrences more closely.
Explanation:
Explanation:
A simulation is a way of imitating a process or change in the real world to predict what will happen or explain what did happen and why, these days simulations are often run on computer,scientists use simulations to answer questions see how complex system works test ideas and make predictions, hope it helps^^
btw I'm no expert, I did research^^
Which of the following refers to all of the organisms in a particular area?
O population
O ecosystem
O community
O organelles
Identify the atomic number and atomic mass: Hydrogen: 1 proton, 0 neutrons, 1 electron
Answer:
Atomic Number: 1
Atomic Mass: 1
Explanation:
Atomic number = # of protons
Atomic mass = # of protons + # of neutrons
can you identify an atom without knowing numbers of neutrons in it?
Answer:
No
Explanation:
We cannot identify an atom without knowing numbers of protons in the atom.
The number of neutrons is the amount of neutrally charged particles in an atom. These subatomic particles occupy the dense nucleus with the protons.
To determine an atom, we use their atomic numbers. Atomic number is the number of protons in an atom. Protons are the positively charged particles in the atom. The periodic table of elements is arranged by the atomic number of an element.HI I AM KEANU REEVES
Answer:
hey
Explanation:
Answer:
hi
Explanation:
UwU
Given the unbalanced combustion equation: C3H8 + O2 → CO2 + H2O, how many moles of carbon dioxide are produced when 64.0 g of oxygen is reacted with excess propane?
Moles of Carbon dioxide : 1.2
Further explanationA reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.
Reaction(balanced)
C₃H₈ + 5O₂=> 3CO₂ + 4H₂O
mol of O₂ :
[tex]\tt \dfrac{64}{32}=2[/tex]
mol of CO₂ :
[tex]\tt \dfrac{3}{5}\times 2=1.2[/tex]
PLS 10 points!!!
Rupert's backyard is 10 m by 5 m. The area of the yard is:
50 m
50 m2
15 m
15 m2
Please need the answers from 1/9 help me please
Answer:
1. Dune
2. Glaciers
3. Loess
4. Glacial drift
5. Glaciers deposit their sediment when they melt. They drop and leave behind whatever was once frozen in their ice. It's usually a mixture of particles and rocks of all sizes, called glacial till.
6. Large plants like shrubs and trees break the wind. Compare and contrast how wind and glaciers abrade rocks. Both move rock materials past each other. The materials moved by wind are very small, wheres they are glaciers they can abrade a large rock.
7. A mass movement can either be slow or rapid. The slow downward movement of materials in a slope is called creep. This happens when the soil loosens up because of water and burrowing animals. In contrast to this, the rapid movement of large materials in a slope is called landslide.
8. Check brain.ly
9. Check Slader
Explanation:
What is the problem with a series circuit? *
A. They do not work
B. 1 goes out, they all go out
C. They are hard to create.
Answer:
I believe it is B
Explanation:
When Jeremy returned home after vacation, he noticed that his new plant had not grown. His mother, a florist, told him that it was because the plant was not getting enough sunlight. He moved his plant closer to the window to get more sunlight. How can Jeremy best support the idea that his plant needs more sunlight? Ask his mother to make the plant better. Wait and see what happens to the plant. Remove the plant from direct sunlight after a week. Ask his science teacher at school what she thinks could be the reason.
Answer:
Wait and see what happens to the plant.
Explanation:
The best course of action for Jeremy would be to wait and see what happens to the plant after moving it closer to the window to get more sunglight.
If the plant grows after observing it for some times, he can conclude that light has been a major hindrance to the growth and more sunlight would benefit the plant. If the observation is otherwise, then Jeremy can conclude that the lack of growth observed is not due to light.
Answer:
remove the plant from direct sunlight after a week
Explanation:
Mass is a(n)
property.
O a. electrical
Oc. chemical
Ob. physical
O d. natural
Answer:
d. natural I think is the right answer
Explanation:
I think thats the right answer
You have a flexible helium balloon filled with 0.100 mol of gas that is 2.10 L at a certain temperature and pressure. If you deflate the balloon at, constant temperature and pressure, so that it is now only 0.700 L, how many mol of gas are remaining in the balloon?
Answer:
0.033 mole
Explanation:
The following data were obtained from the question:
Initial mole (n1) = 0.1 mol
Initial volume (V1) = 2.1 L
Final Volume (V2) = 0.7 L
Final mole (n2) =?
Since the temperature and pressure is constant, then the number of mole remaining in the balloon can be obtained by using the following formula as illustrated:
V1 /n1 = V2 /n2
2.1/0.1 = 0.7/n2
21 = 0.7/n2
Cross multiply
21 × n2 = 0.7
Divide both side by 21
n2 = 0.7/21
n2 = 0.033 mole
Thus, 0.033 mole of the gas is remaining in the balloon.
On a hot day, Ava got herself a carbonated beverage. She knew from her science class that carbonated drinks had carbon dioxide in them.
She noticed that bubbles started to form and rise upwards only after she unscrewed the cap. She then opened another bottle that was much colder and she noticed fewer bubbles had formed. Explain what Ava observed. PLS ANSWER, I NEED HELP !!
Explanation:
Using a derivative of the combined gas law we can explain what is happening in both instances.
Assuming that the volume is constant which is predicated on the bottle shape and structure, the pressure of a given mass of gas varies directly with the absolute temperature.
As temperature increases, the pressure also increases and vice versa.
The first bottle at a higher temperature has a higher pressure of gas. The second bottle at a lesser temperature has a reduced pressure inside.When an atom is unstable, what will happen?
Answer: Unstable atoms will lose neutrons and protons as they attempt to become stable, atoms the binding energy is not strong enough to hold the nucleus together
Explanation:
Which electron configuration represents the electrons of an atom of neon in an excited state
Answer:
Explanation:
The answer is 2-7-1, because the second shell isnt full and it already has a third shell.
What are the two main factoErosion by wind and water can move pieces of soil and rock.
As these materials settle on top of each other, they are pressed together, forming _______.rs in the mantle that contribute to the rock cycle
Answer:
purppurppurppurppurppurp
How many hydrogen atoms are found in 3H2CO3?
Answer:
6
Explanation:
The number of hydrogen atoms in the given compound is 6 atoms.
Given compound is:
3H₂CO₃
An atom is the smallest indivisible particles of an element.
In the compound;
3H₂CO₃
Elements Number of atoms
H 3(2) = 6
C 3(1) = 3
O 3(3) = 9
The number of hydrogen atoms in the compound is 6
are the answers correct ?
Answer:
yeh they are all correct .
SEP Engaging in Argument Use the phase diagrams for CO2 and H2O in the Experience Notebook. Theaters sometimes use dry ice (solid CO2) to produce dense clouds of smoke like fog on stage. A classmate claims that the phase diagrams of H2O and CO2 show that it would not be practical to use H2O for this purpose. Do you agree with the classmate’s claim? Cite reasons to support your argument.
Answer:
Agree (see explanation)
Explanation:
I do agree with this statement of practicality. According to my research and viewership of phrase diagrams for both substances, water enters a similar form of “smoke” or “steam” at incredibly hot temperatures usually secluding to temperatures of over 200 degrees Fahrenheit (100 degrees Celsius) versus carbon dioxide of which enters this state at room temperature (60-70 degrees Fahrenheit). In order for either of these events to occur in this form, both must undergo procedures of sublimation where solids transfer directly from solids to gases, skipping the liquid state. Water contains ionic hydrogen bonds of which are incredibly strong particle arrangements, therefore requiring much higher temperatures to divide and individualize these particles forming high pressure and kinetic energy. Since carbon dioxide is formed of covalent bond ship, the intermolecular forces are relatively weak making the process of sublimation quite instant when this substance experiences exposure to specific temperatures, typically temperatures that we consider “normal”.
Hopefully I helped anyone understand this, and I apologize for being late to this question.....very late.
1. You are pushing a heavy shopping cart full of water bottles with a constant force. The shopping cart has
mass of 250 kg and it is accelerating down the aisle at 0.20 m/s? How much force are you exerting?
Answer:
F = 50 N
Explanation:
Given data:
Mass of car = 250 Kg
Acceleration of car = 0.20 m/s²
Force required = ?
Solution:
Formula:
F = m×a
F = applied force
m = mass
a = acceleration
Now we will put the values in formula.
F = 250 Kg × 0.20 m/s²
F = 50 Kg.m/s²
Kg.m/s² = N
F = 50 N
Molecules of a gas _____.
move slowly and are far apart
move fast and are far apart
move slowly and are close together
move fast and are close together
Answer:
Explanation:
Move fast and are far apart is the correct answer