A population is a group of individuals of the same species living in a particular area at the same time.
What is the population?The whole number of people or inhabitants in a country or region.
A population is the number of living people that live together in the same place. A city's population is the number of people living in that city. These people are called inhabitants or residents. The population includes all individuals that live in that certain area.
Hence, a group of organisms of the same species that live in an area is called a population.
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How is the modern periodic table different from Dmitri Mendeleev's table?
A. Elements that have similar properties are now grouped together.
O B. Elements are now organized by increasing atomic mass.
OC. The lanthanides and actinides are now in rows below the main
table.
D. The table is now used to predict the properties of elements.
Elements are now organized by increasing atomic mass. Hence, option B is correct.
What is a periodic table?The periodic table is a tabular array of chemical elements organized by atomic number.
Mendeleev's periodic table orders the elements based on their atomic mass whereas the Modern periodic table orders the elements based on their atomic number.
Hence, option B is correct.
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A 140.05g sample of NiSO4 . XH2O is heated until there is no further decrease in the mass. The mass of the anhydrous salt is 77.5g. What is the value of X?
From the calculations, the value of x is found to be 7.
What is the anhydrous salt?The anhydrous salt is the salt that does not contain the water of crystallization.
We know that;
Number of moles of anhydrous salt = number of moles of hydrated salt
Number of moles of anhydrous salt = 77.5g/155 g/mol = 0.5 moles
Number of moles of hydrated NiSO4= 140.05g/155 + 18x
Thus;
0.5 = 140.05g/155 + 18x
0.5 (155 + 18x) = 140.05
77.5 + 9x = 140.05
x = 140.05 - 77.5 /9
= 7
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2. How many grams of NaCl are required to prepare 0.40 L of a 0.75 M solution?
The mass of a NaCl solution that is required to prepare 0.40 L of a 0.75 M solution is 17.55g. Details about mass can be found below.
How to calculate mass?The mass of a substance can be calculated by multiplying the number of moles by its molar mass.
However, the number of moles of a solution must be initially calculated by using the following formula:
molarity = no of moles ÷ volume
no of moles = 0.75 × 0.40
no of moles = 0.3 moles
mass of NaCl = 0.3 × 58.5 = 17.55g
Therefore, the mass of a NaCl solution that is required to prepare 0.40 L of a 0.75 M solution is 17.55g.
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what is indicated by the methyl- prefix
Answer:
B
Explanation:
The methyl prefix means theres a CH3 group bonded to a carbon in a hydrocarbon. This is called branching because it looks like a branched tree. This is literally cheating but you do you.
Which of the following statements is true? Radiation is the transfer of heat between objects which are not touching. An insulator speeds up the vibration of molecules and the transfer of heat. Heat is transfered in solids through conduction. All of the sun's heat is reflected by the Earth's atmosphere.
Answer:
Radiation is the transfer of heat between objects which are not touching. I think
Explanation:
I need the answers of these
Answer:
Hope this helps :D
Explanation:
Metal: Aluminum and Copper
Non-Metal: Hydrogen and Flourine
Acid: Sulfuric Acid and Phosphoric Acid
Alkali Metals: Hydrogen and Lithium
Compounds: Water and Carbon Dioxide
Elements: Carbon and Oxygen
Mary has a sample of permanganate (MnO4-1), in which Manganese has an oxidation state of +7. She wants to reduce the Manganese, which means she needs a substance that will oxidize readily. Which of the following substances should she choose? Explain your reasoning.
Lithium solid (Li)
Silicon solid (Si)
Bromine liquid (Br2)
Why is water used as a solvent in many solutions?
A Water dissolves other water molecules.
B Water dissolves any chemical.
C Water dissolves nonpar molecules.
D Water dissolves polar molecules.
O A
OB
O C
O D
PLEASE HURRY!
Determine if the following two structures are identical, isomers, or unrelated?
Based on the given information, the given structures are isomers, i.e., option B as they have different arrangements, but the same molecular formula.
What are isomers?Isomers are organic compounds having the same molecular formula and different molecular structures.
This difference is due to varying spatial arrangement of atoms in the compounds.
Isomers of different compounds have different properties based on the molecular formula.
Thus, the correct option is B.
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This diagram models a sound wave from a car horn hitting a wall. According to the model, which statement best describes what happens to the sound energy when the sound wave hits the wall?
Answer:
When sound wave hits the wall , some portion of the sound is reflected back to air which is converted into heat energy and
lost in the atmosphere and some of its transmitted through the walls.
I have to pick which one is an oxidation reduction reaction please help!!
Why do the carbon atoms with the double bond contain 1 less Hydrogen atoms then
carbon atoms that contains a single bond?
Answer:
The double bond is shown conventionally by two lines joining the atoms. Each line represents one pair of shared electrons. Carbon dioxide, CO2 Ethene, C2H4 Ethene has a double bond between the two carbon atoms. A more sophisticated view of the bonding in ethene
Explanation:
Toothpaste contains Sodium fluoride which is used to prevent tooth decay. How many grams are in 1 mole NaF?
The answer is 42 grams of NaF are there in 1 mole.
What is a mole ?A mole is defined as 6.022 × 10²³ atoms, molecules, ions, or other chemical units.
and the molar mass of a substance is defined as the mass of 1 mole of that substance, expressed in grams per mole.
It is equal to the mass of 6.022 × 10²³ atoms, molecules, or formula units of that substance.
Molar Mass , i.e. mass of 1 mole of NaF is sum of molar mass of Na and F
23 + 19
42 grams
Therefore 42 grams of NaF Sodium-fluoride are there in 1 mole.
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What is the mass in grams of each of the following?
a.) 6.02 x 1024 atoms Bi
c.) 6.02 x 1022 atoms He
e.) 6.02 x 10¹5 atoms U
b.) 1.00 x 1024 atoms Mn
d.) 6.02 x 10¹5 atoms N
Answer:
a. 208g Bi
c. 0.0400g He
e. 2.38g U
b. 9.12g Mn
d. 1.40g N
Explanation:
I apologize in advance if any are incorrect. Hopefully this helps.
plain how to calculate the number of atoms in 31.1 g of Au.
Answer:
See Below
Explanation:
mole weight of Au ( gold) = 196.97 gm
31.1 / 196.97 = number of moles of Au
Number of moles * Avagadro's Number = number of atoms
31.1 / 196.97 * 6.022 x 10^23 = 9.508 x 10^22 atoms
why does the sloth have both a scientific name and common name
under what circumstances will a scientific theory be changed or dicarded
Answer:
I think it's..
Explanation:
You can explain more, please.
Provide the bond type, molecular structure, and intermolecular forces for h2o and co2. compare and contrast these structures from nacl. using that information, explain why each of these are in a different phase at room temperature.
Intermolecular forces are the forces present between the molecules. In carbon dioxide the intermolecular force is LDM and in water, hydrogen, LDM, and dipole-dipole are present.
What is molecular structure?Molecular structures are the arrangement of the atoms in the three-dimensional phase of the molecule along with their electrons. Water has a bent shape while carbon dioxide has linear shape geometry.
Water is a polar covalent molecule that has hydrogen and dipole-dipole bonding and forces that makes them strong enough to make them liquid at RT. On another hand carbon dioxide is a nonpolar covalent molecule that is gas at room temperature.
Sodium chloride is an ionic compound that has anions and cations in it. As it has high lattice energy it remains solid at room temperature.
Therefore, water, carbon dioxide, and sodium chloride are at different phases at room temperature.
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What do the Arctic and Antarctic tundra's have in common? Select all that apply.
They experience frigid temperatures and harsh winds.
Humans live among the plants and animals.
They have land mammals that live there.
They have producers that live there.
Answer:
A and D
Explanation:
The two answers to select would be A. (They experience frigid temperatures and harsh winds) and D. They have producers that live there. Using process of elimination, it can't be option B. The Artic has 53 different species of land mammals, however the Antarctic does not. So that leaves you with A and D.
What best describes the relationship between photosynthesis and cellular respiration? a.Celluar respiration and photosynthesis are identical reactions. b. photosynthesis is just like celluar respiration, but oxygen is involved. c. celluar respiration and photosynthesis are not related at all. d. photosynthesis and celluar respiration are opposite reactions.
The statement 'photosynthesis and cellular respiration are opposite reactions' best describes the relationship between photosynthesis and cellular respiration.
What is cellular respiration?Cellular respiration is a chemical process where foods and oxygen are used to generate ATP in aerobic conditions.
Conversely, photosynthesis is a chemical process where light and carbon dioxide are used to generate chemical energy.
In conclusion, the statement 'photosynthesis and cellular respiration are opposite reactions' best describes the relationship between photosynthesis and cellular respiration.
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Why the bond angle of ammonium is larger than water?
Answer:
This repulsion is stronger than the repulsion between the lone pair and the three bond pairs on the nitrogen atom. Since the repulsions on the bond pairs in H2O molecule are greater than that in NH3 the bond angle in water is less than that of ammonia.
Although xenon and neon are noble gases and therefore do not typically form bonds, weak attractive forces do exist between atoms of these substances. choose the statement that best explains why xenon has a higher boiling point than neon.
a.xenon has a smaller atomic mass than neon
b.xenon has more electron than neon
c.xenon forms more hydrogen bonds than neon
d.xenon is more polar than neon
The statement that best explains why xenon has a higher boiling point than neon is that xenon has more electrons than neon.
What are intermolecular forces?The term intermolecular forces are the force that hold matter together in a particular state such as solid liquid or gas. The more the electrons present, the greater the polarizability and the greater dispersion forces at work.
Thus, the statement that best explains why xenon has a higher boiling point than neon is that xenon has more electrons than neon.
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Question 3 of 10
Which of the following cells would you use to electroplate silver (Ag) on iron
(Fe)?
A. A dry cell
B. A voltaic cell
C. A galvanic cell
D. An electrolytic cell
Answer:
the answer is D
Explanation:
I hope it helps you
D. An electrolytic cell would be used to electroplate silver (Ag) on iron
(Fe).
To electroplate silver (Ag) on iron (Fe), an electrolytic cell would be used. In an electrolytic cell, electrical energy is used to drive a non-spontaneous chemical reaction, such as the deposition of silver onto the iron surface.
In the process of electroplating, the iron object serves as the cathode, where the reduction reaction occurs. The silver ions (Ag⁺) from the electrolyte solution are attracted to the cathode and are reduced to form solid silver (Ag) on the iron surface.
An electrolytic cell consists of two electrodes (anode and cathode) immersed in an electrolyte solution. The anode is typically made of the metal that will be dissolved or oxidized, while the cathode is the surface onto which the desired metal will be plated. In this case, the iron object would act as the cathode.
A dry cell (Option A) is a type of battery that produces electrical energy through a chemical reaction, but it is not suitable for electroplating. A voltaic cell (Option B) and a galvanic cell (Option C) are both types of electrochemical cells that produce electrical energy from spontaneous chemical reactions. However, they are not designed for the purpose of electroplating.
Only an electrolytic cell (Option D) allows the controlled deposition of one metal onto another by using an external power source to drive the desired reaction. Therefore, an electrolytic cell would be the appropriate choice for electroplating silver onto iron.
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Which radioisotope is used to treat thyroid disorders?.
Answer:
I-123 and I-131
Explanation:
Radioactive iodine takes advantage of the fact that thyroid cells and thyroid cancer cells absorb iodine; therefore, it has been used to diagnose or treat various thyroid disorders. Iodine is made into two radioactive isotopes, I-123 and I-131, that are commonly used in patients with thyroid disease.
2.
An ion has 15 protons, 16 neutrons, and 18 electrons.
a.
b.
What is the atomic number?
What is the mass number?
What is the overall charge?
d. Write the isotope notation.
C.
What is the general formula for a straight-chain alkane?
C2H8
CH3CH3CH3
CH3CH2CH3
CH3CH2CH2CH3
Answer:
The general formula for a straight chain alkane is CnH(2n+...so correct option is C and D
An isotope with a half life of 10 min and a starting sample size of 100 g would have
how many grams remaining after 30 minutes?
Answer:
12.5 gm left
Explanation:
30 minutes is THREE half lives
1/2^3 = 1/8th would be left
100g * 1/8 = 12.5 gm
Due to the fact that the half-life of the isotope is just 10 minutes, there will be 12.5 grammes of the original sample, which weighed 100 grammes, left after 30 minutes.
We can use the half-life to figure out how much of the isotope is left after 30 minutes by looking at how it breaks down.
A radioactive isotope's half-life is the amount of time it takes for half of the original sample to decay. In this case, 10 minutes is the half-life.
After 10 minutes, 50 g of the isotope will be left from the 100 g sample because 50 g of it will have decayed. Now, the first half-life has come to an end.
After another 10 minutes (for a total of 20 minutes), half of the leftover 50 g will decay, leaving us with 25 g of the isotope.
After another 10 minutes, for a total of 30 minutes, half of the 25 g that is still there will decay, leaving us with 12.5 g of the isotope.
So, there will be 12.5 grammes of the isotope left from the 100 g sample after 30 minutes.
It's important to keep in mind that the process of decay is exponential. With each passing half-life, the amount of isotope that is left drops by half. Because of this, it takes longer and longer for the amount of isotope that is left to decrease significantly, but it will never hit zero.
Understanding the idea of "half-life" is important in many areas of science, such as atomic dating, nuclear medicine, and environmental science, because it helps figure out how fast radioactive materials break down and what effects they might have on living things and the environment.
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9. Which practice has been able to save some organisms from extinction?
O cross breeding
O genetic modification
O captive breeding
Orebuilding habitats
The practice that has been able to save some organisms from extinction is cross breeding.
What is cross breeding?Cross breeding is the process of producing separate strains of the same species in order to create new traits.
Living organisms are bound to go extinct when faced by certain unfavorable conditions that cannot be adapted to.
However, the production of resistant strains of the same species of an organism via cross breeding can help prevent them from going extinct.
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Answer:
c
Explanation:
Suppose cobalt-60 undergoes a type of radioactive decay that does not
change the identity of the isotope. which type of decay did the isotope
undergo?
a. delta
b. gamma
c. alpha
d. beta
Which two phase changes occur when you increase the heat?
Answer:
Heat going into a substance changes it from a solid to a liquid or a liquid to a gas. Removing heat from a substance changes a gas to a liquid or a liquid to a solid.
Liquid → Gas:
VaporizationGas → Liquid:
CondensationSolid → Liquid:
Melting or fusion
Solid → Gas: Sublimation
Explanation: