how many moles are in 0.250 g of h20
Answer:
moles in 0.250 g of h20 is 1.349x10^-2
Describe what happens to the light between when it first enters a raindrop and when it comes out of the raindrop. Support your answer with evidence from the text.
When sunlight enters a raindrop in the air, the light splits into a multitude of colors. This light then reflects off the back of the raindrop and re-emerges in the direction in which the light first entered. The light emerging from many raindrops creates a rainbow.
if a magnet is broken which one of the following remains unchanged in each part mass, magnetisation, length
Explanation:
magnetization
coz it will still have two pols that is north and south pole
What is watershed management?
Living organisms contain a variety of specailsed cells name one example of a specialised cell in the body and state its function example : function :
Answer:
See the answer below
Explanation:
The cell represents the basic unit of life and any living organism.
One example of specialized cells in the body are the sex cells.
The sex cells are primarily concerned with reproduction and perpetuation of life. The cells undergo meiosis to produce haploid gametes. Male and female gametes then fuse together during fertilization to give rise to diploid zygotes which eventually give rise to new organisms.
1. When water is evaporated from a copper sulfate solution, copper sulfate remain.
in certain fireworks potassium nitrite breaks down into potassium oxide, nitrogen and oxygen. This is an example of a _________ reaction. The opposite process is a ________ reaction.
options for both blank spots are the same.
A. combustion
B. decomposition
C. replacement
D. synthesis
Select the correct answer from each drop down menu.
HELLLPPPP PLEEASEE!!!!
What causes the periodic (recurring)
patterns seen in the periodic table?
How is my drawing. Rate it on a scale of 1-10
Answer:
I rate it 10/10
Explanation:
I like it. :)
Answer:
I think 8.5 it looks cool
What atoms in water are attracted to Chlorine?
Answer: hydrogen and oxygen
Explanation:
A 5.00 L flask contains 7.94 g of a gas at STP. What is the molar mass of the gas?
Answer: 35.6 g/mol
Explanation: I guessed and got it correct
The molar volume of any gas behaving ideally at STP is 22.414 L. The molar mass of the gas at STP is 35.59 g.
What is molar mass?The molar mass of a substance is defined as the mass of one mole of molecules. In other words one gram molecular mass of a substance is same to its molar mass in g mol⁻¹.
The molar mass of a substance can be obtained by adding the atomic masses of each elements. At 0°C and 1 atm, 1 mole of any gas behaving ideally occupies a volume of 22.414 L.
Here 5.00 L of the gas at STP has a mass of 7.94. Then the molar mass of 22.414 liters of the gas can be calculated as:
7.94 × 22.414/5.00 = 35.59 g.
Thus the molar mass of the gas is 35.59 g.
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CH4+2 O2-> CO2 + 2 H2O
You burned 15.0 grams of methane (CH4) in an excess of oxygen and formed 23.8 grams of water. What was your percent yield, rounded to 3 sig-figs?
C= 12.001 g/mol
H= 1.008 g/mol
O= 16g/mol
From the chemical equation it is clear that, one mole or 16 g of methane gas gives 2 moles or 36 g of water. Then, 15 g gives 33.7 g of water. The actual yield is 23.8 g. Then the percent yield is 70.6%.
What is percent yield of a reaction?Percent yield of a reaction is the ratio of its actual yield to the theoretical yield multiplied by 100. The theoretical yield is calculated from the balanced chemical equation of the reaction.
molar mass of methane gas = 16 g/mol
molar mass of water = 18 g/mol
16 g of methane gives 2 moles or 36 g of water. Then 15 g of methane will gives:
(15×36)/16 = 33.7g
The actual yield of water = 23.8 g
then,
percent yield = 23.8 g/33.7 g × 100 = 70.6%.
Therefore, the percent yield of water is 70.6%.
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A researcher notices that atoms of an element x are releasing energy. Why does this happen?
Answer:
The atoms are affected by light.Please give me Brainliest it would mean a lot
Explain why you can't just make gold out of a random yellow substance like straw or urine.
Answer:
because you cant
Explanation:
Which of the following is a product in the reaction described by the word equation below?
iron + copper(II) sulfate ----------> iron(II) sulfate +copper
Answer:
Please answer my question
What is the only natural way that carbon can move OUT of the geosphere?
burning of fossil fuels
volcanic eruptions
dissolution
decomposition
Answer:
volcanic eruptions
Explanation:
determine the velocity of a cart traveling at 135cm in 5.5s.
Answer: 0.245 m/s
Explanation:
So velocity = d/t or distance over time in this case m/s or meters per second. But BE CAREFUL you must remember to convert cm to m always so 135 cm= 1.35m and 1.35m/5.5s= 0.245m/s
1. List 3 physical and chemical phenomena
Answer:
Examples of chemical changes are burning, cooking, rusting, and rotting. Examples of physical changes are boiling, melting, freezing, and shredding. Often, physical changes can be undone, if energy is input.
Hope this helped.
Which change does not increase the speed of reaction between zinc and hydrochloric acid?
By adding the decreasing the temperature, the speed of the reaction will not be increased.
What is speed of the reaction ?The reaction rate, which is a measure of how quickly reactants are consumed as well as products are created, determines the speed of a reaction.
When the temperature is lowered, the molecules move more slowly and collide less. The reaction's speed is slowed as the temperature drops.
Therefore, by adding the decreasing the temperature, the speed of the reaction will not be increased.
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A sample of gas is collected over water at a temperature of 35.0◦C when the barometric pressure reading is 642 torr. What is the partial pressure of the dry gas, given PH2O = 42.2 torr? Answer in units of torr.
Answer: The partial pressure of the dry gas is 599.8 torr
Explanation:
According to Dalton's law, the total pressure is the sum of individual pressures.
[tex]p_{total}=p_{dry gas}+p_{H_2O}[/tex]
Given : [tex]p_{total}[/tex] =total pressure of gases = 642 torr
[tex]p_{dry gas}[/tex] = partial pressure of dry gas = ?
[tex]p_{H_2O}[/tex] = partial pressure of water = 42.2 torr
putting in the values we get:
[tex]642torr=p_{\text {dry gas}}+42.2torr[/tex]
[tex]p_{\text {dry gas}}=599.8torr[/tex]
Thus the partial pressure of the dry gas is 599.8 torr
What is the formula unit for a compound made from Li and Cl? (5 points)
LiCl because the total negative charge on Cl is one.
LiCl because the total negative charge on Li is two.
Li2Cl because the total positive charge on Cl is one.
Li2Cl because the total positive charge on Li is two.
Answer:
LiCl because the total negative charge on Cl is one.
Explanation:
Lithium has a charge of 1+ and Chlorine has a charge of 1-.
There are two types of chemical compound one is covalent compound and other is ionic compound. LiCl because the total negative charge on Cl is one. The correct option is option A.
What is chemical Compound?
Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
Covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Ionic compounds are hard, these have higher melting and boiling point than the covalent compounds. Li act as cation Li⁺ and Cl act as Cl⁻. These two combine to form LiCl. LiCl is an ionic compound.
Therefore, LiCl because the total negative charge on Cl is one. The correct option is option A.
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Think of a real-life situation in which measuring work and power would be important
Answer:
Being a CEO holds a lot of power and work but, you would need to be able to manage thus power to be able to keep your company running in good hands. work comes in because as a ceo you'll obviously have lots of work but you'll also have employees all of which assist you with managing work
what provides support and transportation of materials for a plant
Answer: Xylem is the tissue responsible for supporting the plant as well as for the storage and long-distance transport of water and nutrients, including the transfer of water-soluble growth factors from the organs of synthesis to the target organs.
Explanation:
Answer:
Xylem is the tissue responsible for supporting the plant as well as for the storage and long-distance transport of water and nutrients, including the transfer of water-soluble growth factors from the organs of synthesis to the target organs
Explanation:
What type of reaction is...
(NH4)2CO3(aq) → NH3(g) + CO2(g) + H2O(l)
a. combustion
b. single replacement
c. synthesis
d. double replacement
e. decomposition
Answer:
d: double replacement
Explanation:
We have that for the Question "What type of reaction is...
(NH4)2CO3(aq) → NH3(g) + CO2(g) + H2O(l)
" it can be said that
(NH4)2CO3(aq) → NH3(g) + CO2(g) + H2O(l) is a decomposition reaction
Option E
From the question we are told
What type of reaction is...
(NH4)2CO3(aq) → NH3(g) + CO2(g) + H2O(l)
a. combustion
b. single replacement
c. synthesis
d. double replacement
e. decomposition
Generally
We have that a combustion is a reaction with oxygen to release energy a
it is in the form of
[tex]X+0_2 ---CO_2+H_2O[/tex]
double replacement
in this reaction two ionic compounds share ions to create two variant compounds with the same amount of ions
decomposition
This occurs when a compound is broken down into smaller compounds
Therefore
(NH4)2CO3(aq) → NH3(g) + CO2(g) + H2O(l) is a decomposition reaction
Option E
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2)
The IUPAC name for the common household cleaner, ammonia, is nitrogen trihydride. Identify the formula of ammonia.
A)
NH
B)
ΝΗ,
C)
NH
D)
N3H3
Answer:
The formula of ammonis is given as NH3
Explanation:
The given IUPAC name of ammonia is nitrogen trihydride.
From the name of IUPAC name of the ammonia it is evident that there is only one atom of nitrogen is present in one molecule of ammonia.
Word 'trihydride ' means a that there are three hydrogen atoms present as hydride in one ammonia molecule.
So, the formula of ammonia will be guven as: NH3
Answer:
it's NH3.....
Explanation:
so......
Developing Scientific knowledge
Fill in each blank with the word that best completes the statement
Scientists develop knowledge by making
about the natural world that may lead to a
scientific question
A scientific question may lead to an)
which can be tested
The results of
can lead to changes in scientific knowledge.
Answer:
Scientists develop knowledge by making observation about the natural world that may lead to a scientific question.
A scientific question may lead to a(n) hypothesis which can be tested.
The results of experimentation can lead to changes in scientific knowledge.
Explanation:
In the process of developing scientific knowledge, scientists carry out series of observations on what happens in the natural world. This helps them to develop scientific questions. These scientific questions drawn can then lead to hypotheses which are testable.
The testing process leads to experimentation. It is in this process that much scientific questions receive answers. Testing actually lies at the core of scientific inquiry for all scientists. Whatever hypothesis made must always be tested.
The result of the testing or experimentation brings changes in scientific knowledge.
The star betelgeuse is 325 light years away. If it were to explode in a supernova tonight, would we know? Explain your answer.
Answer:
We will not know immediately
Explanation:
The distance of star Betelgeuse = 325 light years
Therefore, if it where to explode, at the location, we would have a supernovae such that the luminosity of the star multiplies several multiple times
However, due to the distance of Betelgeuse from the Earth, it will take the light of the explosion, 325 years to reach Earth and the explosion as it happens will not be noticed here on Earth immediately
What the concentration of oxygen
Answer:
19.5%
Explanation:
the air required for human breathing is 19.5 percent.
The smallest part of a compound that still has the properties of that compound is a(n)
OA. orbital.
ОВ.
molecule
OC.
mixture
OD.
nucleus.
a molecule is the smallest particle of a compound is still has the compounds property it consists of two or more atoms bonded together
When solid calcium carbonate (CaCO3) is heated, it decomposes to form solid calcium oxide (CaO) and carbon dioxide gas (CO2). How many liters of carbon dioxide will be produced at STP if 2380 g of calcium carbonate reacts completely? CaCO3 (s) CaO (s) + CO2 (g)
Answer:
533.12 L
Explanation:
The balanced chemical equation for the decomposition of CaCO₃ is the following:
CaCO₃(s) → CaO(s) + CO₂(g)
According to the equation, 1 mol of CaCO₃ produces 1 mol of gas (CO₂). We convert the moles of CaCO₃ to mass in grams with the molar mass of the compound:
molar mass CaCO₃ = 40 g/mol Ca + 12 g/mol C + (3 x 16 g/mol O)= 100 g/mol
mass of CaCO₃ = 1 mol x 100 g/mol = 100 g CaCO₃
Now, we know that 1 mol of any gas at STP occupies a volume of 22.4 L:
1 mol CO₂ = 22.4 L CO₂
Thus, the stoichiometric ratio is: 22.4 L CO₂/100 g CaCO₃
Finally, we multiply this ratio by the mass of CaCO₃ to calculate how many liters of CO₂ at STP are produced:
2380 g CaCO₃ x 22.4 L CO₂/100 g CaCO₃ = 533.12 L
The 533.12 L of carbon dioxide will be produced at STP if 2380 g of calcium carbonate reacts completely.
The balanced chemical equation for the decomposition of CaCO₃ is the following:
CaCO₃(s) → CaO(s) + CO₂(g)
What is a balanced chemical equation?A balanced chemical reaction is an equation that has equal numbers of each type of atom on both sides of the arrow.
According to the equation, 1 mol of CaCO₃ produces 1 mol of gas (CO₂).
We need to convert the moles of CaCO₃ to mass in grams with the molar mass of the compound:
Molar mass CaCO₃ = 100 g/mol
Mass of CaCO₃ = 1 mol x 100 g/mol = 100 g CaCO₃
Now, we know that 1 mol of any gas at STP occupies a volume of 22.4 L:
1 mol CO₂ = 22.4 L CO₂
Thus, the stoichiometric ratio is:
[tex]\frac{22.4 L\; CO_{2} }{100 g \;CaCO_3 }[/tex]
Finally, we multiply this ratio by the mass of CaCO₃ to calculate how many liters of CO₂ at STP are produced:
2380 g CaCO₃ x 22.4 L CO₂/100 g CaCO₃
= 533.12 L
Hence, the 533.12 L of carbon dioxide will be produced at STP if 2380 g of calcium carbonate reacts completely.
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