We need to separate different components of a mixture to separate the useful components from the non-useful or some harmful components.
Examples:
(a) Tea leaves are separated from tea.
(b) Pebbles are separated form rice and pulse.
Explanation:
The mixtures are separated into their components for the following reasons:
1. To remove an undesirable component - Tea is made by boiling tea leaves in water and then adding milk and sugar. After the tea has been made, the used tea leaves become the undesirable component of the mixture 'tea' and are removed from it by using a tea strainer.
2. To remove a harmful component - Foodgrains like rice, wheat, pulses etc. usually contain small pieces of stones and some insects etc. These are harmful to us and are hence removed from the foodgrains before using them.
3. To obtain a pure sample of a substance - Tap water contains some dissolved salts in it so it is an impure mixture. This water is made free of dissolved salts or impurities by the process of distillation and as a result, we get a pure sample of water.
4. To obtain a useful component - Milk is a mixture from which useful component 'butter' is separated.
Chapter 15 Lesson 3 Protecting Earth
pointsssssssssssssss
Answer:
May i ask what is the question?
Explanation:
How many moles of carbon are 8.7x1023 atoms of carbon?
One mole of every substance contains 6.022×10²³ number of atoms. One mole carbon have these much atoms and thus number of moles of carbon having 8.7 × 10²³ atoms is 1.44 moles.
What is carbon?Carbon is 6th element in periodic table. It is a p block element and is a non-metal. Carbon forms covalent bonds with other elements.
One mole of every elements contains 6.022×10²³ number of atoms and it is called Avogadro number. Similarly one mole of a compound contains 6.022×10²³ number of molecules.
The number of atoms in one mole of carbon is 6.022×10²³.Therefore, number of moles of carbon which contains 8.7 × 10²³ atoms is calculated as follows:
number of moles of carbon = 8.7 × 10²³/6.022×10²³
= 1.44 moles.
Therefore, the number of moles of carbon containing 8.7 × 10²³ atoms is 1.44 moles.
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how many salt and water would you use to prepare 10% salt solution?
Answer:
We can make 10 percent solution by volume or by mass. A 10% of NaCl solution by mass has ten grams of sodium chloride dissolved in 100 ml of solution. Weigh 10g of sodium chloride. Pour it into a graduated cylinder or volumetric flask containing about 80ml of water.
Explanation:
have a good day
Why does water dissolve ionic compounds and solar compounds?
Why are mass of atoms called relative masses?
The atomic mass constant (symbol: mu) is defined as being 112 of the mass of a carbon-12 atom. Since both quantities in the ratio are masses, the resulting value is dimensionless; hence the value is said to be relative.
Nh3 metabolism - Urea cycle
Explanation: The urea cycle (also known as the ornithine cycle) is a cycle of biochemical reactions that produces urea (NH 2) 2 CO from ammonia (NH 3). This cycle occurs in ureotelic organisms. The urea cycle converts highly toxic ammonia to urea for excretion.
Jim makes a table that lists soluble and insoluble substances. Which statement best explains why the table is incorrect?
a table with the titles Soluble and Insoluble, written underneath Soluble is sugar, food coloring, and honey, and written underneath Insoluble is sand, grass, and salt
A. Food coloring is an insoluble substance.
b. Honey is an insoluble substance.
C. Grass is a soluble substance.
D. Salt is a soluble substance.
Answer:
D
Explanation:
The statement that best explains why the table is incorrect is: Grass is a soluble substance. Option C is correct.
In the table, grass is listed under "Insoluble," but in reality, grass is not a substance that dissolves in water. It is a complex mixture of various compounds, including cellulose and other organic materials, which are not water-soluble. Grass does not dissolve when added to water; instead, it remains intact and is not readily soluble.
On the other hand, all the other substances listed in the table are correctly categorized. Sugar, food coloring, and honey are soluble substances because they dissolve in water. Sand and salt are insoluble substances because they do not dissolve in water.
Hence, C. is the correct option.
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Please help me with this question it’s really confusing and I’ll give you extra credit :)) THANK YOU SMM
Answer:
it wants you to conclude what you have learned by writing if you think there is a link between the impact and the extinction of the dinosaurs by stateing any similarities to the two events and provide evidence to surpport your claim
Explanation:
The electronic structure 1s22s22p63523p64523d8 refers to the ground state of
Kr.
Ni.
Pd.
Fe.
none of the above.
Previous
Answer:
Ni
Explanation:
Electronic configuration given by
[tex]\\ \sf\longmapsto 1s^22s^22p^63s^23p^64s^23d^8[/tex]
No expectations so it's Z=28Element is nickel
this one too please lol
Answer:
It looks like 43 to me, so 43 ml?
Explanation:
I'd say that's 43ml
Hope this helps- have a good day bro cya)
The best representation of the ozone molecule incorporates both of the structures that you drew in parts C and D.
Redraw the Lewis structures of an ozone molecule and place a two-ended arrow between the structures, pointing to both
of them. This representation is called a resonance structure.
Answer:
Explanation:
EDMENTUM
The Lewis structure for ozone contains a central oxygen atom that has a double bond to one oxygen atom and a single bond with the other oxygen atom. The resonance structure of the ozone is shown in the attached figure below.
What is the lewis structure of the ozone molecule?The oxygen molecule has a valency of -2. It can form two-sigma bonds or covalent bonds with the other atoms. Oxygen contains three lone pairs to form π bonds with other atoms. Ozone contains all three oxygen atoms and is a dihedral molecule with sp² hybridization.
Lewis structure is generally based on the octet rule which states that there should be eight electrons in the valence shell or orbit of an atom for a stable molecule.
The lone pair on the central oxygen atom repels the electrons in the two side bonds and adopt a bent molecular geometry. The expected geometry is the trigonal planar with a bond angle is 120°.
In an ozone molecule, six valence electrons for each molecule of Oxygen so the total number of valence electrons is 6 × 3 = 18. As both Oxygen atoms on the sides have the same electronegativity, therefore, the double bond keeps on shifting from both causing resonances.
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Explain why powdered magnesium reacts faster with 30cm3 of 2M Hydrochloric acid
than equal mass of Magnesium ribbon with 30cm3 of 2M hydrochlorric acid
Answer:
powder has more surface area than a ribbon since each grain also has its own "spherical" surface area compared to a magnesium ribbon where you can only see the top and bottom of the grains as a collective
State the type of reaction and balance it properly: NaOH + CaBr2 → Ca(OH)2 + NaBr
Answer:
2NaOH(aq) + CaBr2(s) → Ca(OH)2(s) + 2NaBr(aq)
The given chemical equation depicts chemical reaction of double displacement type and it's balanced chemical equation is 2 NaOH + CaBr₂ [tex]\rightarrow[/tex] Ca(OH)₂ + 2 NaBr.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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Complete the paragraph below. Do it using your Science journal or notebook
SUSPENSION IS A KIND OF MIXTURE____________________________
_________________AS IT________________________________AT THE BOTTOM WHEN LEFT UNDISTURBED
Answer:
SUSPENSION IS A KIND OF MIXTURE where particlea are visible to the naked eyes AS IT settled AT THE BOTTOM WHEN LEFT UNDISTURBED.
3 points
If 1.40 mol of Mg are mixed with 2.00 mol of HCl, how many moles of excess reactant remain after the reaction is complete?
2HCl(aq) + Mg(s) - H2(g) + MgCl2 (aq)
Note: Do not include units when you enter your answer.
Type your answer...
Previous
Answer:
H2(g) + MgCl2 (aq)
Explanation:
Scientists always consider that whenever there is an experiment, there is a tendency for a
decrease in the amount of the expected product. Is this result a violation of the law of
conservation of matter? Why or Why not?
The masses conservation law allows us to find that the answer for which the quantity of product is less than are:
There are other competitive competitive chemical reactions. Some of the reactants did not mix. The efficiency of the reaction is less than calculated.
One of the great conservation laws of science is the conservation of mass, therefore the initial mass is equal to the final mass, even in nuclear reactions where part of the mass is converted into energy, if it is taken into account mass and energy this mass-energy relationship is conserved.
In a chemical reaction the constituents mix and form new compounds, in an ideal case all the material of the constituents must react, but in real cases there is some part of the reactants that does not react in the required direction, therefore the amount of product is less than expected.
When adding the moles of the refractants and comparing with the moles of the product and the unreacted or reacted material in other products should be the same.
The fact that there is less product than expected in a reaction is due to the existence of other competitive reactions.
Consequently using the masses conservation law we can find that the quantity of products is less than expected are:
There are other competitive competitive chemical reactions. Some of the reactants did not mix. The efficiency of the reaction is less than calculated.
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explain why the reaction between calcium carbonate and sulphuric acid would not get to completion
Answer:
The calcium sulphate is insoluble in dilute sulphuric acid and so you end up with calcium carbonate coated in a layer of calcium sulphate, which stops the acid from getting at the carbonate and so stops the reaction. so you would not get any completion .
15 and extra credit not 14
Determine the mass percentage of carbon, C, hydrogen, H, and oxygen, O, in C6H8O7. Refer to the periodic table for the atomic mass of each element.
Answer:
C=37.5% H=4.2% O=58.3%
Explanation:
molar mass of element / molar weight of compound X 100% (for each element)
C mass = 12 x 6 = 72
H mass = 1 x 8 = 8
O mass =16x 7 = 112
Molar weight of compound = 192
72/192(100%)= 37.5% C
8/192(100%) = 4.2 % H
112/192 (100%) = 58.3% O
The mass percentage of carbon, hydrogen, H, and oxygen, O, in C₆H₈O₇ is C = 37.5% H = 4.2% O = 58.3%.
What is the mass percentage?The concentration of an element in a compound or component in a combination is calculated by the mass percentage.
The collective of a component is divided by the entire mass of the mixture to obtain the mass percentage, which is then multiplied by 100%.
Given, finding the mass percentage of carbon, hydrogen, H, and oxygen, O, in C₆H₈O₇
the molar mass of element / molar weight of compound X 100% (for each element
First, calculate the molar mass of the elements given in the compound.
C mass = 12 x 6 = 72
H mass = 1 x 8 = 8
O mass =16x 7 = 112
Molar weight of compound = 192
72/192(100%)= 37.5% C
8/192(100%) = 4.2 % H
112/192 (100%) = 58.3% O
Thus, the mass percentage is C = 37.5% H = 4.2% O = 58.3%.
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write the formulas of the above. compounds and the symbol of its elements.
Answer:
a.MgO
b.CaO
c.SO2
d.Na2O
e.CO2
what is the percent by mass of chlorine in potassium chloride
Answer: Originally Answered: A sample of 0.892g of potassium chloride is dissolved in 54.6g of a water. What is the percent by mass of the potassium chloride in this solution?
Well, take the quotient…
0.892∙g0.892∙g+54.60∙g×100% percentage by mass potassium chloride
≈2%
Explanation:
what are the elements in group 5 in the periodic table
Answer:
Vanadium (V), Niobium (Niobium), Tantalum (Ta), Dubnium (Db), Cerium (Ce), and Thorium (Th)
Explanation:
Groups go vertical (up and down) on the periodic table.
Periods go horizontal (left to right) on the period table.
If an ion has a -2 charge, how many extra electrons do you add to the lewis structure
Answer:
add 2 extra electrons
Explanation:
This is because -2 means 2 electrons are gained while +2 means it lost two electrons.
If an ion has a charge of -2, you have to add two extra electrons to its Lewis structure.
The Lewis structure of a compound is a structure that shows the arrangement of electrons in the outermost or valence shell of an atom.
An ion is formed by adding or removing electrons from a specie. The magnitude of the resulting charge depends on the number of electrons added or removed from the specie.
To form a negative charge of magnitude -2, I have to add two electrons to the Lewis structure of the specie.
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What is the name for the electrons involved in metallic bonding ?
Answer:
valence electrons
Explanation:
A 125g sample of a mixture of salt and sand contains 12% salt.
a. How much salt (in g) does the sample contain?
b. How much sand (in g) does it contain?
Write the formula of the first five members in the series of alkynes
A substance has a freezing point of –38°C and a boiling point of 356°C. At what temperature would this substance be in its liquid state?
A) -100°C
B) -50°C
C) 80°C
D) 375°C
Answer:
X. 80°
Explanation:
if the substance is below -38 then it is in the solid phase (-100° and -50°) and if it is above 356° it is a gas (375°). Therefore anything in the middle is a liquid, 80°.
Given that the substance freezes at –38°C and boils at 356°C, it will be a liquid at a temperature of 80°C.
What is liquid range?The term liqiid range refers to the temperatire range within which a substance remains in its liquid state. Now we are told that the substance freezes at –38°C and boils at 356°C.
Hence, we expect that this substance will be in the liquid state at a temperature of 80°C.
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What is the most unique element and why
Answer:
The answer is Aluminium.
Explanation:
It has low density, is non-toxic, has a high thermal conductivity, has excellent corrosion resistance and can be easily cast, machined and formed. It is also non-magnetic and non-sparking. It is the second most malleable metal and the sixth most ductile.
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