Answer:
3.57moles
Explanation:
The number of moles in a compound can be got from the number of molecules it contains.
Since;
number of moles (n) = number of molecules (nA) ÷ Avagadro's number
Avagadro's number = 6.02 × 10^23 molecules
H20 contains 2.15 x 10^24 molecules, according to this question. Therefore,
n = 2.15 x 10^24 ÷ 6.02 × 10^23
n = 0.357 × 10^(24-23)
n = 0.357 × 10^1
n = 3.57moles
Hence, 3.57moles are present in in 2.15 x 10^24 molecules of H2O.
what is the formula and give the name of the compound formed by following ions: hydrogen, and nitrite. (hydrogen : H, group 1)
Explanation:
Hydrogen = H
Nitrite = NO₂⁻
The compound formed by Hydrogen and Nitrite is;
Name = Nitrous Acid
Formular = HNO₂
What will most likely cause a sudden wind to start blowing?
Answer:
wind is just high and low pressure of air, when a high pressure comes and crashes into a low pressure air pocket than it can form a wind storm.
Explanation:
The Uneven heating of the Earth's surface. Earth's rotation and unequal heating of the Earth's surface. air pressure towards regions of lower air pressure. ... air moving from areas of high pressure to areas of low pressure.
This is what will most likely cause a sudden wind to start blowing.
what happens when a book falls of a desk?
I'd barely seen you when you asked me if I hated you
Wasn't surprised but still had nothing I could say to you
I'm sorry if I ever made you feel the way you do
Yeah, I know I know you better than your parents
I heard about 'em, you don't gotta be embarrassed
You go online 'cause that's where you can be the saddest
You've been acting careless
Know you put on a happy face
You need someone who's gonna stay
I know you're crushed under the weight
Wanna hold you up, wanna hold you up
You keep things bottled up inside
I wish you'd give someone a try
You fell apart a million times
Wanna hold you up, wanna hold you up
Before my heart gives out
You're losing track of all the friends I know you used to have
Don't know what happened but the old you wasn't half as bad
I'm sorry no one sees what's going on inside your head
Yeah, I know I know you better than your parents
I heard about 'em, you don't gotta be embarrassed
You go online 'cause that's where you can be the saddest
You've been acting careless
Know you put on a happy face
You need someone who's gonna stay
I know you're crushed under the weight
Wanna hold you up, wanna hold you up
You keep things bottled up inside
I wish you'd give someone a try
You fell apart a million times
Wanna hold you up, wanna hold you up
Before my heart gives out
I know that you hate when I figure you out
You get so distant just so you can hear a sound
Swear that you've been gone but yet your body's still around
What are you doing now?
Know you put on a happy face
You need someone who's gonna stay
I know you're crushed under the weight
Wanna hold you up, wanna hold you up
You keep things bottled up inside
I wish you'd give someone a try
You fell apart a million times
Wanna hold you up, wanna hold you up
Before my heart gives out
Answer:
Happy Face excellent song
Explanation:
and gravity takes the book and pulls it to the ground
You have 2000 g of radioactive substance with a half-life of 100 years four half-lives go by how many grams do you have the radioactive substance do you have left
Answer:
after 4 half-lives, 125g is left
Explanation:
The half-life of a radioactive substance is the time it takes for the substance to decay by half its original mass.
In this example, we are asked to find the remaining mass after four half-lives.
What we will simply do is to reduce the starting mass by half, after each half-life decay. this is done as follows:
1st half-life decay: starting mass 2000g
final mass = 2000g ÷ 2 = 1000g
2nd half-life decay: starting mass = 1000g
final mass = 1000 ÷ 2 = 500
3rd half-life decay: starting mass = 500
final mass = 500 ÷ 2 = 250g
4th half-life decay: starting mass = 250g
final mass = 250 ÷ 2 = 125g
∴ after 4 half lives, 125g is left
How do temperature, humidity, and pressure vary within an air mass?
A.Temperature and humidity vary, but pressure does not.
B.Humidity makes the pressure in an air mass increase.
C.Temperature, humidity, and pressure are basically the same all through an air mass.
D.Temperature at the border of an air mass is always higher than in the middle.
Make sure to give me an explanation so I don't get dirt about me cheating. I just really need to know this simple question. Please, be so helpful.
Answer:
C
Explanation:
Temperature, humidity, and pressure are all the same through an air mass.
What is the chemical name of the compound K2504?
Answer:
Potassium sulfate
Explanation:
I searched it up on the internet
Can I please have a brainliest
Why is a pyramid shape used to represent the energy in an Ecosystem?
Answer:
An energy pyramid shows the flow of energy at each trophic level in an ecosystem. A pyramid shape is used because energy is lost at each trophic level when organisms use it up.
Explanation:
What happens when a base dissolves?
O A. It increases the concentration of OH in solution.
O B. It increases the concentration of Hi in solution.
O C. It is no longer dangerous.
O D. It adds oxygen to the solution.
Answer:
A. It increases the concentration of OH in solution.
Explanation:
Answer:
B. It increases the concentration of Hi in solution.
Explanation:
A.p.e.x
3. How can a community help implement Ecological Solid Waste Management.
4. As a student, how can this program help you in your school?
Answer:
It help cause we compost food scraps and other organic wastes. We also reuse and recycle materials to organize for government and industry to develop community recycling materials.
It depend on your opinion as a student.
Explanation:
Hope it helps
Organizing a community to collect waste and implementing ecological solid waste management greatly helps to reduce pollution and landfilling also creates ideas for recycling.
What is solid waste management ?In order to build and sustain an efficient waste management programme, community-based waste management are partnerships between non-governmental organizations, governmental organizations, and the affected communities.
Community based waste management helps to direct participation and accountability of community members monitoring the collection and reduction of trash waste separation at the homestead level
Similarly they are using priceless and reusable goods on-site , recycling organic trash as well as public collection service collects and transports garbage to a treatment facility.
Find more on waste management:
https://brainly.com/question/14665452
#SPJ2
What provides the energy to set the water cycle in motion?
Nothing, the water cycle does not need energy.
Clouds
Sun
Water.
What is the relationship between atoms and mass?
Answer:
Explanation:
A property closely related to an atom's mass number is its atomic mass. The atomic mass of a single atom is simply its total mass and is typically expressed in atomic mass units or amu.
There are only 90 naturally occurring elements on Earth but there are millions of different substances explain how this is possible and describe how it applies to at least three examples
Answer:
See explanation
Explanation:
While it is true that there are only about 90 naturally occurring elements, these elements are capable of combining with each other to form millions of substances.
Most of the substances that we see around us today result from a combination of one or more of these naturally occurring elements.
Let us look at three examples;
The carbohydrate in food is composed of carbon, hydrogen and oxygen
The stainless steel materials we use are composed of iron, carbon and other trace elements
Glass is made up of silicon, oxygen and other elements
Only 90 naturally occurring elements capable of combining with each other to form millions of substances.
Compounds:
When two or more elements combine in a certain ratio to form a molecule.
For example-
Water is made up of two hydrogen and one Oxygen ration is 2:1.
If hydrogen and Oxygen combine inn 2:2, they for Hydrogen peroxide.
Water gives life and Hydrogen peroxide can kill a person.
Other examples are,
The carbohydrate in food is composed of carbon, hydrogen and oxygen. The stainless steel is made up of iron, carbon and other trace elements. Glass is composed of silicon, oxygen and other elements.Therefore, only 90 naturally occurring elements capable of combining with each other to form millions of substances.
To know more about Compounds,
https://brainly.com/question/13119094
A simple machine that has
disc with a grooved rim to wind up a string called is_____
Answer:
PULLEY
Explanation:
A pulley is an example of a simple type of machine. It is either a wooden or a metallic disc which can rotate about a horizontal axis passing through its centre. It has a grooved rim along which a rope or chain can slide. It is generally mounted in a frame work called a block.
If the Sun continues its evolution according to theory, what will be its last stage?
A.As a black hole
B. As a white dwarf
C. As a red giant
D. As a planetary nebula
Pls help
The last electron in an atom of oxygen is added to a ___ orbital.
a. 2p
b. 1p
c. 3p
d. 2s
Answer:
A
Explanation:
What are the four ions formed when sodium chloride undergoes electrolysis?
Answer: The four ions formed are [tex]H^+[/tex] , [tex]OH^-[/tex] , [tex]Na^+[/tex] and [tex]Cl^-[/tex]
Explanation:
Electrolysis is the process where electricity is used to drive chemical reactions.
In the electrolysis of aqueous solution of sodium chloride, hydrogen gas produces at the cathode which is a negative electrode and chlorine gas produces as the anode which is a positive electrode and the sodium hydroxide remains dissolved in the solution.
The reactions will be :
[tex]NaCl\rightarrow Na^++Cl^-[/tex]
[tex]H_2O\rightarrow H^++OH^-[/tex]
Hence, electrolysis of an aqueous solution of sodium chloride lead to the formation of four ions,[tex]H^+[/tex] , [tex]OH^-[/tex] , [tex]Na^+[/tex] and [tex]Cl^-[/tex]
Se ard 25g de magneziu de puritate 90%. Ce volum de oxigen se consumă și câti moli dioxid de magneziu se formează
Answer:
10.5 dm3 O2
0.94 moles de MgO
Explanation:
La pregunta dice explícitamente que el magnesio es puro en un 90%.
Por lo tanto, masa de magnesio puro = 90/100 * 25G = 22,5 g
Número de moles de Mg = 22,5g / 24g/mol = 0,94 moles de Mg
La ecuación de reacción es;
2Mg (s) + O2 (g) ------> 2MgO (s)
Si 2 moles de Mg reaccionan con 1 moles de O2
0.94 moles de Mg reacciona con 0.94 * 1/2 = 0.47 moles de O2
Si 1 mol de O2 ocupa 22,4 dm3
0.47 moles de O2 ocupan 0.47 * 22.4 / 1 = 10.5 dm3
También;
2 moles de Mg producen 2 moles de MgO
Entonces, 0.94 moles de Mg producen 0.94 moles de MgO
Which of the following explains this observation?
A. Sound has longer wavelengths than light
B. Light has a greater mass than sound
C. Light travels faster than sound
D. Sound and light travel at the same speed
Marie Curie was discriminated against because she was a woman. Do you feel that there are still barriers to women entering careers in science these days2. Explain your answer.
Answer:
yes I do I feel like people think that people's are thinking that men are stronger then women in someone situations
Answer:
yes
Explanation
i would say yes because many woman and girls struggle to get jobs because of their record,hair,skin color,and past.
A tank for storing liquid as a base of area 1.5 meters square. What is the pressure on the base of the tank when it contains water weighting 4500n
Answer:
3000 Nm^2
Explanation:
We must remember that pressure is defined as force per unit area.
We have been given the following information in the question;
Area of the tank= 1.5 m^2
Weight of water in the tank = 4500N
And;
P = F/A
F= force
A = area
P = 4500 N/1.5m^2
P= 3000 Nm^2
The light energy captured during photosynthesis is stored as
water.
sugar.
carbon dioxide.
electrons.
Answer:
Sugar
Explanation:
This is because water and carbon dioxide are required during photosynthesis. Oxygen along with glucose, that is a type of sugar is produced. The oxygen is diffused out in to the air, while the sugars are stored in the leaf thus light energy captured during photosynthesis is stored as 'sugar'
when do you consider that a typhoon will enter or effect the country
Answer:
sorry I don't understand this subject sorry
Explanation:
Please help due today!
for the first one it is B OR THE SECOND OPTION
AgNO3 (aq) +
Cu(s) —
Cu(NO3)2 (aq) +
| Ag(s)
What is the integer?
Answer:
2
Explanation:
2AgNO3 + Cu -----> Cu(NO3)2. + 2Ag
You can calculate the mechanical energy of an object by _____.
A. first calculating its thermal energy
B.adding its chemical energy and its electrical energy
C. subtracting its potential energy from its kinetic energy
D. combining its potential energy with its kinetic energy
Answer:
D - combining it's potential energy with it's kinetic energy
Please help me like now please
Answer:
1-1) NaHCO3 + CH3COOH --> NaCH3COO + H2O + CO2
1-2) 0.5 mole of CO2
2-1) 2C4H10 + 13O2 --> 8CO2 + 10H2O
2-2) 4 mol CO2
Explanation:
Question 1
NaHCO3 + CH3COOH --> NaCH3COO + H2O + CO2
To balance the equation, count the number of atoms on both sides of the equation
(1 Na, 1+3+1H, 1+1+1C, 3+2Oxygen) --> (1 Na, 1+1+1C, 3+2H, 2+1+2Oxygen)
Combining the pluses will give you the following
(1 Na, 5H, 3C, 5Oxygen) --> (1 Na, 3C, 5H, 5Oxygen)
Both sides are the same, therefore the chemical equation is balanced (originally).
From the equation, we can see that 1 mole of NaHCO3 produces 1 mole of CO2.
So that means 0.5 mole of NaHCO3 would produce 0.5 mole of CO2.
Question 2
C4H10 + O2 --> CO2 + H2O
Again, count the number of atoms on both sides of the equation
(4C, 10H, 2O) --> (1C, 2H, 3O) This time left does not equal right side
You now need to find factors that can make both sides equal.
C4H10 + O2 --> 4CO2 + H2O Now the C is balanced, let's recount
(4C, 10H, 2Oxygen) --> (4C, 8+1Oxygen, 2H) H&O is still not balanced
C4H10 + O2 --> 4CO2 + 5H2O Now the H is balanced, let's recount
(4C, 10H, 2Oxygen) --> (4C, 8+5Oxygen, 10H) O is still not balanced
C4H10 + (13/2)O2 --> 4CO2 + 5H2O Now the O is balanced
(4C, 10H, 13Oxygen) --> (4C, 13Oxygen, 10H)
But because 13/2 is a fraction, we want to eliminate that by multiplying every reactant and product by 2 (the denominator).
2C4H10 + 13O2 --> 8CO2 + 10H2O Now it's completely balanced!
(8C, 20H, 28Oxygen) --> (8C, 28Oxygen, 20H) Yayy! It's balanced.
Now, 2 mol C4H10 produces 8 mol CO2.
So 1 mol C4H10 produces 4 mol CO2.
show that the molecular formula of urea is CH4ON2 if the %by mass of 02 atoms is one mole of urea molecule is 26.66%
Answer:
Mostly, the molecule has a planar geometry allows free rotation of bonds. The chemical structure of the compound could be given as below. Urea Formula Molecular Mass. This molecule is generally available in final products of proteins of metabolism of humans and animals. Its main existence can be felt in the urine of humans that is formed
Explanation:
the molecular formula of urea is CH4ON2 if the %by mass of 02 atoms is one mole of urea molecule is 26.66%
Which one of the following statements is true?
Answer:
A calculator has an endifiite shape because all of its atoms are touching each other
Please I need this help me
Answer:
first of all is that really chemistry
Explain how both analytical and creative problem-solving strategies can be applied to the following scenario. Jeff notices that his family's trashcan overflows the day before trash pickup each week. He suggests getting a bigger trashcan to solve the problem. Jeff's father tells him that the size and number of trash bags they can set out each week is limited by a city ordinance.
Answer: They can be apllied to the senario he can pettition or he can use bigger bags those are just a couple of ideas.