Answer:
1
Explanation:
M r ( NaCl ) = A r ( Na ) + A r ( Cl ) = 23 + 35,5 = 58,5
So, 1 mol of NaCl has a mass of 58,5 g.
Moles of NaCl = 58,5 g NaCl
times (x)
1 mol NaCl = 58,5 g NaCl = 1,00 mol NaCl
According to the mole concept, there are 0.140 moles in teaspoon of salt that contains 5 g.
What is a mole?Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.
It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.
It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass in grams present in one mole of atoms is its atomic mass.Number of moles is calculated as, mass/molar mass.
In this case number of moles is calculated as, 5/35.5=0.140 moles.
Thus, there are 0.140 moles in 5 g teaspoon of salt.
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Why are fossils not found in igneous or metamorphic rocks?
Answer:
Because the rock underwent lava and heat/pressure transformation. They are cooled and heated by magma, and then under go pressure. No fossils would be found in those.
Explanation:
Hope this helps! :)
Answer:
Because...
Explanation:
Igneous rock is cooked in extreme hot temperatures.
Metamorphoc is lava cooled downed.
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
A solution is found to have a pH of 8.3. What is the hydroxide ion, [OH-]
concentration?
Answer:
[OH-] = 2 x 10^-6 M
Explanation:
Calculate pOH first: 14 - pH = pOH --> pH = 14 - 8.3 = 5.7
[OH-] = 10^-pOH = 10^-5.7 = 2 x 10^-6 M
Only one sig fig in the concentration, because the pH only had one decimal place.
What is watershed management?
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
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
What the concentration of oxygen
Answer:
19.5%
Explanation:
the air required for human breathing is 19.5 percent.
Can you quess my Hogwarts house? Please explain why you think that and I will give brainliest
Answer:
I prob can bc I'm a bad b*tch
lol
Answer:
Slytherine
Explanation:
I hope you have a wonderful rest of your day!!!! :)
Suppose a fox population exists in an ecosystem. Some of the foxes maintain a heavy coat year-round, while others shed their heavy coat in the summer. Summers in this ecosystem
are becoming steadily hotter because of global warming. Which members of the species will most likely be able to adapt to the changing temperatures?
subject science
Answer:
The fox who shed their heavy coat in the summer.
Explanation:
If a fox has the ability to shed its coat in the summer, it will have no difficulties adapting to new temperatures even during winter. However, the heavy-coated one will.
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:
You have 54.32 grams of PbCl4. How many moles of PbCl4 do you have?
If you show the work that would be great!
What atoms in water are attracted to Chlorine?
Answer: hydrogen and oxygen
Explanation:
In each of the following sets of elements, which element would be expected to have the smallest atomic size?
a) Na, K, Rb
b) Mg, P, S
c) N, P, Sb
d) C, O, F
Answer:
d) C,O,F
Explanation:
because if you add up the atomic no.s (which is directly the size of the element)of each set d) is smallest.
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
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
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 the only natural way that carbon can move OUT of the geosphere?
burning of fossil fuels
volcanic eruptions
dissolution
decomposition
Answer:
volcanic eruptions
Explanation:
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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Gas in a balloon occupies 3.3 liters. What volume will it occupy if the pressure is changed from 100 kPa to 90.0 kPa, if the temperature is held constant?
Answer:
3.7 L
Explanation:
Initial volume (V₁) = 3.3 L
Initial pressure (P₁) = 100 KPa
Final pressure (P₂) = 90 KPa
Final volume (V₂) =?
The final volume of the gas can be obtained by using the Boyle's law equation as follow:
P₁V₁ = P₂V₂
100 × 3.3 = 90 × V₂
330 = 90 × V₂
Divide both side by 90
V₂ = 330 / 90
V₂ = 3.7 L
Thus, the final volume of the gas is 3.7 L
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......
Explain why you can't just make gold out of a random yellow substance like straw or urine.
Answer:
because you cant
Explanation:
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.
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
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.
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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how many moles of silver nitrate are needed to produce 6.75 moles of copper (II) nitrate upon reacting with excess copper?
Answer:
13.50 moles of AgNO₃ are needed to produce 6.75 moles of Cu(NO₃)₂
Explanation:
We state the reactants:
AgNO₃
Cu
Then, the products are:
Cu(NO₃)₂
Ag
The reaction is: 2AgNO₃ + Cu → 2Ag + Cu(NO₃)₂
Ratio is 1:2.
The copper is in excess, so the limiting reactant is the silver nitrate:
1 mol of Cu(NO₃)₂ is produced by 2 moles of AgNO₃
Then, 6.75 moles of copper (II) nitrate would be produced by, the double of moles
(6 75 . 2) /1 = 13.50 moles
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!!!!
1. When water is evaporated from a copper sulfate solution, copper sulfate remain.
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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