Answer:
The boiling point of the substances
Explanation:
Because Boiling point is an intensive property.
What are the percent compositions of hydrogen and oxygen in water
Answer:
H % = 11.11%
O % = 88.89%
Explanation:
atomic weight of H = 1
atomic weight of O = 16
each molecule of water contains 2 atoms of H and one atom of O
hence molecular weight of water = 18
H % = 2 x 100/18 = 11.11%
O % = 16 x 100/18 = 88.89%
Answer:
-H= 11.19%
-O= 88.81%
Explanation: the answer above mine is incorrect!, i just did it and i got it right, the answer is h= 11.19% and O= 88.81% hope it helps!
Does anybody know how to do q4. Please show working out thanks.
Answer:
% purity of limestone = 96.53%
Explanation:
Question (4).
Weight of impure CaCO₃ = 25.9 g
Molecular weight of CaCO₃ = 40 + 12 + 3(16)
= 100 g per mole
We know at S.T.P. number of moles of CO₂ = 1 and volume = 22.4 liters
From the given reaction, 1 mole of CaCO₃ reacts with 1 mole or 22.4 liters of
CO₂.
∵ 22.4 liters of CO₂ was produced from CaCO3 = 100 g
∴ 1 liter of CO₂ will be produced by CaCO₃ = [tex]\frac{100}{22.4}[/tex]
∴ 5.6 liters of CO₂ will be produced by CaCO₃ = [tex]\frac{100\times 5.6}{22.4}[/tex]
= 25 g
Therefore, % purity of CaCO₃ = [tex]\frac{\text{Weight calculated}}{{\text{Weight given}}}\times 100[/tex]
= [tex]\frac{25}{25.9}\times 100[/tex]
= 96.53 %
determine the type of the following chemical reaction: Mg(s) + 2HCl(aq)——-> H2(g) + MgCl2(aq) a. single replacement reaction b. decomposition reaction c. combination reaction d. double replacement reaction
Answer:
a. single replacement reaction
Explanation:
Mg(s) + 2HCl(aq)——-> H2(g) + MgCl2(aq)
Mg replaces H, so this is a single replacement reaction.
Describe how u would separate a mixture of salt , sand and iodine into different components. please help i will give a brainliest for this . PLEASE HELP?
to remove iodine sublime
to remove sand filter
to remove water evaporate
Explanation:
1. put the mixture in a beaker
2.Heat the mixture using a watch glass filled with cold water, the iodine will sublime at the base of the watch glass.
3.Add water to sand and salt. Stir for salt to diffuse in the water
4.Filter sand from the solution using a filter paper
5.evaporate the remaining water to remain with Salt crystals.
Which of the following describes what happens in a chemical reaction?
O A. Molecules change from one phase to another.
B. Molecules dissolved in solution are separated again.
O c. Chemical bonds are broken, and new ones are formed.
O D. Molecules mix without rearranging atoms.
Answer:
c. Chemical bonds are broken, and new ones are formed.
Explanation:
Hope this helps. :)
In a chemical reaction, chemical bonds are broken, and new ones are formed.
What is a chemical reaction?Chemical reactions are defined as reactions which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.
There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical reactions:
1) inorganic reactions
2)organic reactions
3) biochemical reactions
During chemical reactions atoms are rearranged and changes are accompanied by an energy change as new substances are formed.
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In the hydrogenation of oils the catalyst used is:
A. Pt
B. Ni
C. Fe
D. V2O5
Answer:
B
Explanation:
plz follow me and give brainliest
How do you find the amount of electrons for any element?
Answer:
If you know the number of protons and neutrons you have to simply subtract the number of neutrons by number of protons the answer will be number of neutron
Explanation:
Answer:
We can find the amount of electrons through its Atomic number and with the help of electronic configuration
The number of joules needed to raise the temperature of 32 g of water from 12 °C to 54 °C is
The specific heat of water is 4.184 J/g °C.
Answer: 5,600 J
Explanation:
Joules = mass x specific heat x temperature change
32 x 4.184 x (54 - 12)
= 133.888 x 42
= 5,623.296
(significant figures => 5,600)
Anyone know how to answer this?
Answer:
i metal
ii nonmetal
iii metal
iv nonmetal
Explanation:
If you look up what the element of a heater is, you get a picture of some sort of rod. It's the heating element of the heater, and must be some type of metal to conduct electricity and warm up. Fishing rods are made of either fiberglass, graphite, or carbon fibre. These are nonmetals. In order for a lightning rod to conduct electricity and bring the lightning down to the ground, it has to be metal. You wouldn't want a metal oven mitt, as that would burn your hand.
Magnesium reacts with fluorine to form magnesium fluoride. Which diagram shows the correct arrangement of electrons in the product?
Answer:
Diagram B shows the correct arrangement of electrons in the product.
Magnesium reacts with fluorine to form magnesium fluoride two electrons of magnesium are transferred to the 2 atoms of fluorine and fluorine is the most electronegative element of the periodic table. Option C is correct.
What is electronegativity?Electronegativity is the tendency or power of an atom to attract the electrons from the metals they are mostly nonmetals and want to complete their octave too.
The most electronegative elements of the periodic table are oxygen, nitrogen, and fluorine, as they are always willing to complete the octave, and fluorine will take electrons from magnesium.
Therefore, Option C is correct if the 2 atoms of fluorine and fluorine are the most electronegative element of the periodic table. Magnesium reacts with fluorine to form magnesium fluoride two electrons of magnesium are transferred.
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Which of the following is NOT an indicator of a chemical
reaction?
O A. Breaking into small pieces
OB. Producing a solid
OC. Changing color
OD. Producing light
Answer:OD. Producing light
Explanation:
How do I write these decimal numbers in expanded form? 0.913, 0.205, 0.047, 0.480
Thanks! :)
Explanation:
To write a decimal in expanded form, write the number as a sum of its place values.
0.913 = 0.9 + 0.01 + 0.003
0.205 = 0.2 + 0.005
0.047 = 0.04 + 0.007
0.480 = 0.4 + 0.08
how many atoms are in 2.10 g of K? molar mass of K=39.10g/mole.
Answer:
The answer is option BExplanation:
To calculate the number of atoms we must first calculate the number of moles
Molar mass = mass / number of moles
number of moles = mass / Molar mass
Molar mass (K) = 39.10mole
mass = 2.10g
number of moles = 2.10/ 39.10
= 0.0537mol
After that we use the formula
N = n × L
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10^23 entities
Number of K atoms is
N = 0.0537 × 6.02 × 10^13
N = 3.23×10^22 atoms of KHope this helps you.
PLEASE HELP!! thank you Which element does X represent?
Answer:
95 Kr36
Explanation:
The process by which a large nucleus split into two smaller nuclei is called nuclear fission and occurs after the nucleus has absorbed a neutron that is a product of the radioactive decay of another atom. The formed fission fragments are unstable and extremely radioactive.
What are some similarities and differences between group 1, 0 and 7 elements on the periodic table?
Answer:
Difference : group 1 elements are known as alkali metals, group 7 elements are known as transition metals
Similarities : Both group 1 and 7 elements become more reactive as u go down and up respectively
What are the periodic trends of ionic radii? Check all that apply. Ionic radii tend to increase down a group. Ionic radii tend to decrease across a period. Anionic radii tend to increase across a period. Cationic radii tend to decrease across a period. Ionic radii increase when switching from cations to anions in a period.
Answer:
What are the periodic trends of ionic radii? Check all that apply.
*Ionic radii tend to increase down a group.
Ionic radii tend to decrease across a period.
Anionic radii tend to increase across a period.
*Cationic radii tend to decrease across a period.
*Ionic radii increase when switching from cations to anions in a period.
Answer:
- Ionic Radii Tend To Increase Down A Group.
- Cationic Radii Tend To Decrease Across A Period.
- Ionic Radii Increase When Switching From Cations To Anions In A Period.
Explanation:
i got it correct on edge
What did the photoelectric experiment demonstrate?
A. Light can cause electrons to be released from the surface of a
metal.
B. Light can deposit electrons on a metal surface.
C. Light can make metal atoms move around, producing electricity.
D. Light can heat metal enough to produce electricity.
Explanation:
When an electromagnetic wave like light hits a material, the electrons gets emitted. The emission of electrons is called photoelectric effect. The emitted electrons are called photoelectrons. In this process the transfer of energy takes place from light to an electron.
Hence, the correct option regarding the photoelectric experiment is (A) " Light can cause electrons to be released from the surface of a metal."
Explain the methods of passive transport that move molecules across the plasma membrane of the cell.
a compound X is formed by an element y which is in the form of pellet. The compound X is also the product of chlor - alkali process. Identify X and Y
Answer:
X is sodium hydroxide (caustic soda, NaOH)
y is sodium (Na)
Explanation:
The process of industrial electrolysis of sodium chloride solution by which chlorine and sodium hydroxide (caustic soda) can be produced is known as the chlor-alkali process as follows;
2NaCl + 2H₂O → Cl₂ + H₂ + 2NaOH
Given that the compound X is formed from a element y which is in the form of a pellet, we have;
The element in the above reaction that can exist as pellet is the silver white metallic sodium pellet
Therefore, the compound X is NaOH and the element y is sodium, Na.
For Group 2A metals, which electron is the most difficult to remove? the second the first the third All the electrons are equally difficult to remove.
Answer:
the third
Explanation:
when you remove the first the nucleur attraction becomes greater pulling the other valence electron closer thus the more you remove the harder it gets because the pull from the nucleus increases.
There are various kind of elements that are present in periodic table. Some elements are harmful, some are radioactive, some are noble gases. Option C is correct option.
What is periodic table?Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number.
The elements that belongs to Group 2A metals are alkaline earth metals, their electronic configurations is [noble gas ]ns² so, it is easy to remove first electron and then second electron but it is very difficult to remove the third electron because after removing two electron we get noble gas configuration and effective nuclear charge also increases after removal of second electron.
Therefore, the correct option is option C.
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differentiate between short period and long period
The question is incomplete. The complete question is as follows:
Differentiate between a short period and long period production functions.
Answer:
Difference between a short period and long period production functions is as follows:
Short period: During this period at least one of the factors of production is available in a fixed quantity. For example: Framers having fixed land for growing crops.
Long period: During this period all the factors of production are variable. So change in any variable can increase the production.
The table lists some organelles and functions. Only one pair is correctly matched. Functions of Organelles Organelle Function Chloroplast Stores water and waste materials Cell wall Supports cell membrane, maintains cell shape, and protects cell Cell membrane Breaks down waste materials and debris Vacuole Produces proteins for the cell Which organelle in the table is correctly matched with its function? chloroplast cell wall cell membrane vacuole plz help soon
The organelle that is matched correctly is the Cell Wall
The cell wall functions as a protective organelle as well as gives shape to the cell.
Functions of the cell wallThe cell wall is an organelle found in prokaryotic cells and plant cells.
Cell walls generally function to protect the cell by delimiting its surroundings the membrane from damage.
They also act as permeable structures to substances as well as give the respective cells their characteristic shapes.
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give an example of process you notice or use each day that obeys the law of conservation of mass. and explain how this process works
Answer:
Cellular respiration:
[tex]C_6H_{12}O_6+6O_2\rightarrow 6CO_2+6H_2O[/tex]
Explanation:
Hello,
In this case, the law of conservation of mass states that matter cannot be created nor destroyed but modified, therefore, typical examples are the raft chemical reactions in nature or carried out in a laboratory. Thus, a typical one that could be daily found is in the cellular respiration wherein glucose and oxygen are converted into carbon dioxide, water and energy for us to use it in our daily activities. It is chemically represented by:
[tex]C_6H_{12}O_6+6O_2\rightarrow 6CO_2+6H_2O[/tex]
Law of conservation of mass is verified as six carbon atoms are before and after the chemical reaction, twelve hydrogen atoms are before and after it and eighteen oxygen atoms as well.
Best regards.
A welding torch produces a flame by burning acetylene fuel in the presence of oxygen. This flame is used to melt a metal. Which energy transformation represents this process?
chemical energy into thermal energy
kinetic energy into potential energy
kinetic energy into electromagnetic energy
potential energy into chemical energy
Answer:
chemical energy into thermal energy
Explanation:
The reaction taking place is as follows
2C₂H₂ + 5O₂ = 4CO₂ + 2H₂O + Heat
In this reaction bonds present in acetylene is broken and new bond present in water and carbon dioxide are formed . In the whole process of bond breaking and bond formation , there is net loss of energy and that energy is released as heat energy .
Thus we can say that in the whole process , chemical energy is converted into heat energy .
Answer:
A: chemical energy into thermal energy.
Explanation:
A drug problem can quickly consume A)a small portions of a person income B)the bulk of a person income C)a person excess income
Answer:
b
Explanation:
a drug problem consumes the bulk of a persons income because drugs are expensive to buy
A drug problem can quickly consume the bulk of a person income
What is a drug problem?A drug is any chemical substance that causes a change in an organism's physiology or psychology when consumed. Drug abuse or substance abuse refers to the use of certain chemicals for the purpose of creating pleasurable effects on the brain.
Drug use can have significant and damaging short-term and long-term effects. Taking some drugs can be particularly risky, especially if you take high doses or combine them with other drugs or alcohol.
People of any age, sex or economic status can become addicted to a drug. Certain factors can affect the likelihood and speed of developing an addiction.
The best way to prevent an addiction to a drug is not to take the drug at all. If your doctor prescribes a drug with the potential for addiction, use care when taking the drug and follow the instructions provided by your doctor. Thus you can save your income.
The correct answer is option B.
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