Answer:The number of mole in the compounds are:
A. 6.60 g of (NH₄)₂SO₄ contains 0.05 mole.
B. 4.5 kg Ca(OH)₂ contains 60.81 moles
The mole of a substance is related to its mass and molar mass according to the equation:
With the above formula, we can obtain the answer to the questions given above. This is illustrated below:
A. Determination of the number of mole in 6.60 g of (NH₄)₂SO₄
Molar mass of (NH₄)₂SO₄ = 2[14 + (4×1)] + 32 + (4×16)
= 2[14 + 4] + 32 + 64
= 2[18] + 32 + 64
= 36 + 32 + 64
= 132 g/mol
Mass of NH₄)₂SO₄ = 6.60 g
Mole of NH₄)₂SO₄ =?
Mole of NH₄)₂SO₄ =
Mole of NH₄)₂SO₄ = 0.05 mole
Thus, 6.60 g of (NH₄)₂SO₄ contains 0.05 mole.
B. Determination of the number of mole in 4.5 kg Ca(OH)₂
Molar mass of Ca(OH)₂ = 40 + 2(16 + 1)
= 40 + 2(17)
= 40 + 34
= 74 g/mol
Mass of Ca(OH)₂ = 4.5 kg
= 4.5 × 1000
= 4500 g
Mole of Ca(OH)₂ =?
Mole of Ca(OH)₂ =
Mole of Ca(OH)₂ = 60.81 moles
Thus, 4.5 kg Ca(OH)₂ contains 60.81 moles
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Why are groups 1 and 2 referred to as the s-block of the periodic table
Answer: This is because their valence electrons are located in the S - orbital
Explanation:
This is because their valence electrons are located in the S - orbital.
What NaCl concentration results when 309 ml of a 0.690 m NaCl solution is mixed with 467 ml of a 0.330 m NaCl solution?
Answer:
The resulting NaCl solution has a concentration of 0.4732 M
Explanation:
Concentration is the ratio of amount of solute present in a solution to the amount of solvent or total solution. Morality is the commonly used unit of concentration.
[tex]Concentration=\frac{(\text{Moles of solute})}{(\text{Volume of solution})}[/tex]
Since we are given with same NaCl solution, we have
[tex]\frac{(M_1 V_1+M_2 V_2)}{(V_1+V_2 ) }[/tex]....................(1)
Where
[tex]M_1= 0.690 m[/tex]
[tex]V_1= 309 ml[/tex]
[tex]M_2= 0.330 m[/tex]
[tex]V_2= 467 ml[/tex]
Now substituting the values in equation in (1)
=>[tex]\frac{( (0.690\times 309 )+(0.330\times 467))}{(309+467) }[/tex]
=>[tex]\frac{ (213.21\times 154.11)}{776}[/tex]
=>[tex]\frac{367.32}{776}[/tex]
=>0.4732 M
The resulting concentration when 309 ml of a 0.690 m NaCl solution is mixed with 467 ml of a 0.330 m NaCl solution is 0.473 M.
Explanation:To find out the resulting concentration of NaCl when two solutions of different concentrations and volumes are mixed, we need to determine the total amount of NaCl and the total volume of the solution. The mole of NaCl in a solution can be determined by multiplying the molarity of the solution by its volume.
For the first solution, the number of moles of NaCl = volume (L) × molarity (M) = 0.309 L × 0.690 mol/L = 0.2133 mol
For the second solution, the number of moles of NaCl = volume (L) × molarity (M) = 0.467 L × 0.330 mol/L = 0.154 mol
The total moles of NaCl = 0.2133 mol + 0.154 mol = 0.367 mol
The total volume = volume of first solution + volume of second solution = 0.309 L + 0.467 L = 0.776 L
Finally, the resulting concentration = total moles / total volume = 0.367 mol / 0.776 L = 0.473 M
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Define energy conservation.
Answer:
Energy Conservation is the effort made to reduce the consumption of energy by using less of an energy service.
Energy conservation refers to both the physical principle that energy cannot be created or destroyed and the practical approach of reducing energy consumption and improving efficiency. It involves both changes in individual behaviors and technological advancements to lower energy use and waste.
Energy Conservation Defined
Energy conservation is an important concept in Physics that refers to two key ideas. Firstly, it encompasses the principle that energy cannot be created or destroyed, only transformed from one form to another. This is known as the Conservation of Energy principle. Secondly, in a more practical sense, energy conservation relates to methods and strategies aimed at reducing energy waste and enhancing efficiency. This includes behaviors like turning off lights when not in use, driving efficiently, and using energy-efficient appliances.
Conservation of energy ensures that we reduce our consumption, either by decreasing activities that use energy or by improving the efficiency with which we perform tasks. An example of increasing efficiency would be implementing technological advancements, such as better-insulated homes, which require less energy for heating.
In summary, energy conservation serves both as a fundamental physical law and as a practical approach to manage and reduce energy usage in our daily lives. This dual understanding facilitates the development of sustainable practices and the creation of more efficient technologies, aimed at minimizing our ecological footprint.
Suppose you held a lighted match to a solid hunk of wood and another match to a pile of wood shavings. Which form of wood will catch fire more easily?
Answer:
wood shaving
Explanation:
fire would spread faster
hope that helps
Answer:
The pile of wood will catch fire more easily because the shavings of wood will be heated faster as compared to the hunk of wood.
Explanation:
The reasons for wood shaving will be burnt faster than hunk of wood are:
The wood shavings are the small peeled pieces of wood that absorb heat much faster to reach ignition temperature. The wood shavings have a surface area lower than the wooden hunk, which makes it a lot easier for them to catch fire and spread. The combustion reaction takes place during the burning of wood. The larger the surface area, the more will be the oxygen molecules required to collide with the surface, thus, the wooden log will be burnt lately than wooden shavings.Therefore, the wood shavings will be burnt faster than the hunk of wood because of the smaller surface area and the combustion reaction will be faster than hunk of wood.
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ACROSS
2. Tool that shows wind
direction
3. Temperature scale where
water freezes at 32 degrees
and boils at 212 degrees.
What are all of the pressure conversions ? like torr atm kPa
Answer:
Explanation:
Torr:
Torr is the measure of pressure produced by one mmHg equal to the 1/760 of standard pressure used to the pressure of vacuum system.
Millimeter mercury mmHg:
It is the manometric pressure unit. It is defined as, the pressure exerted by column of mercury one millimeter high. it is represented by mmHg.
Torr to mmHg conversion:
Both are equal to each other.
1 torr = 1 mmHg
Torr to atm:
Torr is converted into atm by dividing the torr value 760.
mmHg to atm.
mmHg is converted into atm by dividing the torr value 760.
Kilopascal:
The kilopascal is the unit of pressure. It is represented by KPa.
it is the pressure generated by 10 g mass of substance on area of 1 cm².
There are 1000 pascal in one kilopasca.
one atm = 101.325 KPa
one atm = 101325 Pa
atm can be converted into KPa by multiplying the given atm value with 101.325.
For example:
4.1 atm × 101.325 kpa/ 1 atm
415.432 atm. kpa / 1atm
415.432 kpa
Kpa to atm:
415.432 kpa/101.325 kpa × 1 atm
4.1 × 1 atm
4.1 atm
Pressure units such as pascals (Pa), kilopascals (kPa), atmospheres (atm), millimeters of mercury (mm Hg), and torr are commonly used in chemistry. The standard conversion equivalencies enable accurate measurement when switching between these units. For example, to convert torr to atm, divide by 760, and to convert psi to kPa, multiply by 6.895.
Understanding pressure conversions is important in chemistry when dealing with gases. The most common units of pressure are pascals (Pa), kilopascals (kPa), atmospheres (atm), millimeters of mercury (mm Hg), and torr. The relations between these units are as follows:
1 bar = 100,000 Pa = 1.01325 atm
To convert these units, use the specified equivalencies. For example, to convert from torr to atm, use the following formula:
Pressure in atm = Pressure in torr / 760
To convert 32 psi to kPa: 32 psi * 6.895 = 220.64 kPa (as 1 psi = 6.895 kPa)
To convert 6.50 millibars to atm: 6.50 m bars / 1013.25 = 0.00642 atm (since 1 bar = 1.01325 atm, and 1 mbar = 0.001 bar)
It's essential to use these conversion factors correctly to obtain accurate pressure values in different units.
How is electronegativity used in determining the ionic or covalent character of the bonding between two elements?
Answer:
If the electronegativity difference between bonded atoms are too much high ionic bonds are formed if the electronegativity diference is 0.4 or less than 0.4 non polar covalnet bond formed the difference greater than 0.4 polar covalent bond formed.
Explanation:
Ionic bond:
It is the bond which is formed by the transfer of electron from one atom to the atom of another element.
Both bonded atoms have very large electronegativity difference. The atom with large electronegativity value accept the electron from other with smaller value of electronegativity.
For example:
Sodium chloride is ionic compound. The electronegativity of chlorine is 3.16 and for sodium is 0.93. There is large difference is present. That's why electron from sodium is transfer to the chlorine. Sodium becomes positive and chlorine becomes negative ion.
Covalent bond:
It is formed by the sharing of electron pair between bonded atoms.
The atom with larger electronegativity attract the electron pair more towards it self and becomes partial negative while the other atom becomes partial positive.
For example:
In water the electronegativity of oxygen is 3.44 and hydrogen is 2.2. That's why electron pair attracted more towards oxygen, thus oxygen becomes partial negative and hydrogen becomes partial positive.
ANSWER FAST!! IF CORRECT WILL GIVE BRAINLIEST~~
The acceleration due to gravity on Earth is 9.80 m/s2. If the mass of a honeybee is 0.000100 kilograms, what is the weight of this insect? 0.100 g / 0.0000102 N / 0.000980 N / 0.000100 kg
Answer:
w = 0.00098 N
Explanation:
Given data:
Acceleration = 9.80 m/s²
Mass of honey = 0.0001 Kg
weight = ?
Solution:
Formula:
w = mg
w = weight
m = mass
g = acceleration due to gravity
Now we will put the values in formula:
w = 0.0001 Kg × 9.80 m/s²
w = 0.00098 N
2 Points
Maria was riding her bike at a velocity of 3 m/s to the north. Her velocity
changed to 11 m/s to the north. What was her change in velocity?
A. -8 m/s north
O
B. 3 m/s north
O
C. 8 m/s north
O
D. 14 m/s north
Answer:
B
Explanation:
She stopped for 4 minutes
She was decreasing in speed
Answer:
The correct answer it 8 m/s north
Explanation:
My test answers
Why is density a physical property but volume isn’t?
Answer:
Density is a physical property but volume isn’t because density is intensive property but volume is extensive property.
Explanation:
EXTENSIVE PROPERTY- A property of matter like volume and mass which depends on the amount of being measured is called extensive property.
INTENSIVE PROPERTY- A property of matter like colour and density which does not depend on the amount of the substance present is called intensive property.
What’s the element?
How many reactants in each?
How many products in each?
Is it balanced?
You may find bellow the answers and the balanced chemical reactions.
Explanation:
2) The chemical reaction is:
2 Na + I₂ → 2 NaI
Na - sodium
I - iodine
In this reaction there are 2 reactants and 1 product.
The reaction is balanced.
3) The chemical reaction is:
N₂ + O₂ → 2 N₂O
N - nitrogen
O - oxygen
In this reaction there are 2 reactants and 1 product.
The reaction is not balanced, the balanced reaction is:
2 N₂ + O₂ → 2 N₂O
4) The chemical reaction is:
N₂ + 3 H₂ → 2 NH₃
N - nitrogen
H - hydrogen
In this reaction there are 2 reactants and 1 product.
The reaction is balanced.
5) The chemical reaction is:
2 KI + Cl₂ → 2 KCl + I₂
K - potassium
I - iodine
Cl - chlorine
In this reaction there are 2 reactants and 2 products.
The reaction is balanced.
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A - ethene
B - oxygen
C - carbon dioxide
D - water
Answer:
ethene is a limiting reagent here
What’s red lion fish habitat ?
Answer:
Are native to the reefs and rocky crevices of the Indo-Pacific, although they've found their way to warm ocean habitats worldwide.
Explanation:
Calculate the OH− concentration after 53 mL of the 0.100 M KOH has been added to 25.0 mL of 0.200 M HBr. Assume additive vol- umes.
Answer in units of M.
Answer:
[tex]\large \boxed{\text{0.0038 mol/L}}[/tex]
Explanation:
1. Calculate the initial moles of acid and base
[tex]\text{moles of acid} = \text{0.0250 L} \times \dfrac{\text{0.200 mol}}{\text{1 L}} = \text{0.005 00 mol}\\\\\text{moles of base} = \text{0.053 L} \times \dfrac{\text{0.100 mol}}{\text{1 L}} = \text{0.0053 mol}[/tex]
2. Calculate the moles remaining after the reaction
OH⁻ + H₃O⁺ ⟶ 2H₂O
I/mol: 0.0053 0.005 00
C/mol: -0.00500 -0.005 00
E/mol: 0.0003 0
We have an excess of 0.0003 mol of base.
3. Calculate the concentration of OH⁻
Total volume = 53 mL + 25.0 mL = 78 mL = 0.078 L
[tex]\text{[OH}^{-}] = \dfrac{\text{0.0003 mol}}{\text{0.078 L}} = \textbf{0.0038 mol/L}\\\\\text{The final concentration of OH$^{-}$ is $\large \boxed{\textbf{0.0038 mol/L}}$}[/tex]
How many atoms are in 4.6 mol K?
Answer:
27.7 × 10²³ atoms
Explanation:
Given data:
Number of moles of Potassium = 4.6 mol
Number of atoms = ?
Solution:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
For example,
18 g of water = 1 mole = 6.022 × 10²³ molecules of water
1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen
For 4.6 moles of K:
One mole = 6.022 × 10²³ atoms
4.6 mol × 6.022 × 10²³ atoms= 27.7 × 10²³ atoms
When a chemical change occurs, new ________ are always formed.
new SUBSTANCES are fomed
What’s the ph of a 6.7*10^-5 m H+ solution
Answer:
Ph= -log10[H+}
Explanation:
Ph+ -log 10(6.7*10-5)≅ 4
Answer:
4.17
Explanation:
The number of
is different for each element and is known as the
number,
Answer:
Electrons, Atomic Number
Explanation:
The total number of electrons is different for each and every element of the periodic table.
It is known as the atomic number of an element.
Mendeleev's Periodic Table's principle:
The properties of the elements is a periodic function of their atomic mass.
But, this was true only for the lighter elements.
So, the principle of the Long Form of the Periodic Table is:
The properties of the elements is a periodic function of their atomic numbers.
How has the growing human population changed the rate at which resources are used?
Substance being reduced?
Answer:
[tex]Ni^{2+}[/tex]
Explanation:
From the equation attached , [tex]Ni^{2+}[/tex] is reduced. This is because reduction is equivalent to decrease in the oxidation number. In the equation , The oxidation number of Ni is reduced from +2 to 0.
NB, The oxidation number of a neutral atom is zero
Name the element which lies in group IA and 3rd period. What is the valency of it and why?
Answer:
Na, valency 1.
Explanation:
Na -sodium.
This element is in the 1A group, so it has 1 electron on the last (valent) level.
So, only 1 electron can participate in forming chemical bond, and therefore the valency of Na is 1.
Final answer:
Sodium (Na) is the element in group IA and the 3rd period, and it has a valency of 1 because it has one valence electron that it can lose to form a +1 cation.
Explanation:
The element that lies in group IA and the 3rd period of the periodic table is Sodium (Na). The valency of sodium is 1, which refers to its ability to combine with other atoms and ions. This valency is because sodium falls in group IA, where the elements have one valence electron that they can lose to form a cation with a +1 charge. The group number for elements in groups 1 and 2 directly correspond to their valences, which is why sodium has a valency of 1.
even though new models were discovered after dalton created his created his five principles, which of these principles still holds true?
Answer:
The explanation is given below
Explanation:
Dalton was the first who putted forward the theory about atom. he describe the properties of atoms of the element. Dalton based his theory on the law of conservation of mass and the law of constant composition.
His theory has 5 basic postulates and these five principals are still true.
1. Dalton stated that all matter composed of atoms are very small in size. these smallest unit of matter (atom) take part in chemical reaction.
2. All the atoms of an element are similar in shape, size, and other properties but different from the atoms of other element.
3. This theory states all matter is made up of atoms and atom can not be created nor destroy.
4. Law of constant composition:
According to this: atoms of different elements combine in a simple, fixed and whole number ratio to form compound.
5. Atoms the element can combine in more than one ratio and form two or more compounds.
The atomic theory of Dalton explained many things.
Other models are its modification and explanation. Dalton was the first who recognize difference between atom of an element compound.
Although there are some discrepancies to explain other points but these 5 points are still workable and true.
The principle that still holds true from Dalton's atomic theory is the law of conservation of matter.
Explanation:Even though new models were discovered after Dalton created his five principles, one principle that still holds true is the idea that atoms are neither created nor destroyed during a chemical change, which is known as the law of conservation of matter. This means that the total mass of matter present in a chemical reaction remains constant.
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Is phosphorus a cation or anion
Answer:
So whilst Phosphorus is an anion, it will usually combine with Iron or Aluminium and act like a cation. The more fine colloids in the soil (such as clay) then the greater the ability of the soil to bind cations.
Explanation:
What happens to the sun's energy when it hits clouds, ice, and snow?
It is mostly reflected.
O It is all absorbed.
It dissipates.
It transfers heat by conduction.
Answer: its mostly reflected.
why do elements in a given group of the periodic table show similar chemical properties?
Answer: Why do all the members of a group have similar properties? They have similar properties, because they share similar amounts of electrons in their outer shell, valence electrons! This means they will only be able to interact with other elements with those electrons so they often show similar properties.
Explanation:
what is the constant of 4x-2y+3
Answer:
3
Explanation:
The constant is 3 because it has no variable attached to it. It is constantly 3 despite any change in variables' values.
450g of chromium(iii) sulfate reacts with excess potassium phosphate. How many grams of potassium sulfate will be produced? (ANS: 6.0*10^2g K2SO4) I need the working and there are a couple more of these if someone's tryna help my dumb self.
Answer:
1597.959 g
Explanation:
Given Data:
Amount of Cr₂(SO₄)₃ = 450 g
Amount of potassium phosphate K₃PO₄ = in Excess
grams of potassium sulfate K₂SO₄= ?
Solution
The Reaction will be
Cr₂(SO₄)₃ + 2K₃PO₄ ----------> 3K₂SO₄ + 2CrPO₄
Information that we have from reaction
Cr₂(SO₄)₃ + 2K₃PO₄ ----------> 3K₂SO₄ + 2CrPO₄
1 mol 2 mol 3 mol
we come to know from the above reaction that
1 mole of chromium(iii) sulfate (Cr₂(SO₄)₃) react with 2 mole of potassium phosphate (K₃PO₄) to produce 3 mole of K₂SO₄
We also know that
molar mass of Cr₂(SO₄)₃ = 147 g/mol
molar mass of K₃PO₄ = 212 g/mol
molar mass of K₂SO₄ = 174 g/mol
if we represent mole in grams then
Cr₂(SO₄)₃ + 2K₃PO₄ ----------> 3K₂SO₄ + 2CrPO₄
1 mol (147 g/mol) 2 mol (212 g/mol) 3 mol (174g/mol)
So, Now we have the following details
Cr₂(SO₄)₃ + 2K₃PO₄ ----------> 3K₂SO₄ + 2CrPO₄
147 g 424 g 522 g
So,
we come to know that 147 g of Cr₂(SO₄)₃ combine with 424 g of 2K₃PO₄ produce 522 g of K₂SO₄
So now we calculate that how many grams of potassium sulfate will be produced
Apply unity formula
147 g of Cr₂(SO₄)₃ ≅ 522 g of K₂SO₄
450 g of Cr₂(SO₄)₃ ≅ ? g of K₂SO₄
by doing cross multiplication
g of K₂SO₄ =522 g x 450 g / 147 g
g of K₂SO₄ = 1597.959 g
So the write answer is 1597.959 g
***Note: By calculation it is obvious that the correct answer is 1597.959 g
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Answer:
B) Cell Membrane
Explanation:
A) Chloroplasts are NOT in all cells, A is incorrect
C) Centrioles are for cell division, C is not correct
D) Cell walls are NOT in all cells, D is not correct
B) the cell membrane is responsible for materials traveling into and out of the cells to maintain homeostasis
How are heterogeneous mixtures and solutions different?
Both are considered mixtures - that is, they are made up of two or more pure substances. ... A heterogeneous mixture appears to be made of different substances. A solution appears the same throughout. In the fluid phase (gas or liquid, or any combination of those) a solution is transparent (thought not colourless).
Final answer:
Heterogeneous mixtures have non-uniform composition and can be differentiated by eye, while solutions have uniform composition throughout and no settling occurs.
Explanation:
A heterogeneous mixture is a combination of two or more substances in which the composition is not uniform throughout the sample, and the individual substances can be differentiated by eye. Examples of heterogeneous mixtures include trail mix, salad, and blood. On the other hand, a solution is a type of homogeneous mixture where the composition is uniform throughout and no settling occurs. Solutions can be colored but are transparent, and the dissolved species are molecules or ions. Examples of solutions include air, simple syrup, and seawater.,
Which element has higher ionization energy? chlorine or carbon
Answer:
chlorine has higher ionization than carbon
Explanation:
Chlorine is only one row below carbon, but it is three columns to the right in this case the IP of chlorine would be predicted to be greater than the IP of carbon.