Why is distillation a physical change explain why and how
The process of distillation explains the difference in the boiling points of the components in the liquid mixture by transforming one of them into a gaseous state. ... As no such step occurs in the process of distillation, it is not a chemical reaction but a physical change
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:
Which of the following best defines average speed?
It is the speed of an object in a specific direction.
It is an object's speed at a specific point in time.
It is the total distance traveled over the total time.
It is a measure of how far an object moves in a certain time.
Answer:
It is the total distance traveled over the total time .
Answer:
D
Explanation:
Why are the components of the mixture separated ? Give any 6 reasons........
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.
a bottle of acetone contains 55.0mL of acetone. If the acetone has a mass of 43.6 g. What is the density of acetone
Answer:
792.72g/L
Explanation:
density formula
density = mass/volume in L
so the density of acetone = 43.6/0.055
792.72g/L
Answer:
so 43.6g devided by 55.0ml and your density of acetone is 0.79g/ml.
An element y has 17 protons in 17 electrons. it gains one electron to form an ion. what will be the charge on an ion .right the number of protons and electrons .write the number of protons and electrons on y in detail
Answer:
A y+B 17 protons and 18 electronsJim 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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Write the formula of the first five members in the series of alkynes
Why does water dissolve ionic compounds and solar compounds?
First atomic bomb was tested where the first atomic bomb was tested in a year
The first atomic bomb was tested July 16th, 1945
210 Miles away south of Los Alamos in New Mexico in the barren plains of Alamogordo Bombing Range
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.
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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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
Hernandez's parents were
farm workers,
A
former
B
server
dairy
D
migrant
Chapter 15 Lesson 3 Protecting Earth
pointsssssssssssssss
Answer:
May i ask what is the question?
Explanation:
chuyển hoá Nh3 - chu trình ure
Answer:
umm translate
Explanation:
Question #1
In a genetics investigation, students used two red straws to represent malo parent DNA. Thoy used two
green straws to represent female parent DNA. The offspring in this activity are best represented by
A
either one red straw or one green straw.
B.
two green straws.
С
two red straws.
one red straw and one green straw.
D
Answer:
D. one red straw and one green straw.
Giúp mình câu này với ạ, mình cảm ơn!
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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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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 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.
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
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
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:
How many mol of hydrogen atoms would be present in 2.51mol of nh3
Which example is a liquid at room temperature?
(a) bromine
(b) fluorine
(c) chlorine
(d) iodine
Which example is a liquid at room temperature?
answer : bromine.
Answer:
bromine is liquid at room temperature ️....
I will mark brainlist please help
1) What is the concentration of a solution that contains 6 moles of solute in 2 liters of solution
• 6M
• 12M
• 7M
• 3M
2) what is the number of moles of solute in 250 mL of a 0.4M solution?
• 0.1 mol
• 0.16 mol
• 0.62 mol
• 1.6 mol
3) the molality of a solution containing 8.1 moles of solute in 4847 g of solvent is
• 39m
• 1.7m
• 0.17m
• 598m
4) which of the following is unchanged when a solution is diluted by addition of solvent?
• volume of solvent
• mass of solvent
• number of moles of solute
• molarity of solution
Answer:
1) 3m
2) 0.1 mol
3) 1.7m
4) number of moles of solute
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.
Write a balanced chemical equation based on the following description:
the reaction of gaseous tricarbon octahydride with oxygen gas produces gaseous carbon dioxide and water vapor
No links or point hunting!
The balanced chemical reaction of gaseous tricarbon octahydride with oxygen gas produces gaseous carbon dioxide and water vapor is as follows: C3H8 + 5O2 → 3CO2 + 4H2O
BALANCED CHEMICAL EQUATION:
Balancing a chemical equation means ensuring that the number of atoms of each element on both sides of the equation is the same. According to this question, gaseous tricarbon octahydride or propane gas (C3H8) reacts with oxygen gas (O2) to produce gaseous carbon dioxide (CO2) and water vapor (H2O). The balanced equation is as follows:C3H8 + 5O2 → 3CO2 + 4H2OLearn more at: https://brainly.com/question/3206228?referrer=searchResults
I know the answer, I just don't know how my teacher got it. Can anyone teach me how to solve it please.
How many moles of oxygen are present in 0.798 moles of Mg(IO3)2?
Answer: 4.79 mol
Answer:
About 4.79 moles of oxygen.
Explanation:
We want to determine the amount of moles of oxygen are present in 0.798 moles of Mg(IO₃)₂.
From the chemical formula, we can see that there are six atoms of oxygen for every molecule of Mg(IO₃)₂. Therefore, we can say that there are six moles of oxygen for every mole of Mg(IO₃)₂. This yields the following ratio:
[tex]\displaystyle \frac{6\text{ mol O}}{1 \text{ mol Mg(IO$_3$)$_2$}}[/tex]
Multiplying this by the initial value yields:
[tex]\displaystyle 0.798 \text{ mol Mg(IO$_3$)$_2$} \cdot \displaystyle \frac{6\text{ mol O}}{1 \text{ mol Mg(IO$_3$)$_2$}} = 4.79 \text{ mol O}[/tex]
In conclusion, there are about 4.79 moles of oxygen present in 0.798 moles of Mg(IO₃)₂.