Answer:
The correct answer is option D: Reheat the sample until its mass is constant.
Explanation:
The student should reheat the sample until its mass will be constant. This to avoid that the percentage contains other substances than only water. During heating, hydrated salt loses its water. He only wants to know the percentage of water, so until the mass keeps changing a lot ( isn't constant), means there is still both water and salt. If the mass doesn't change anymore, means that all the water has been heated and evaporated. Then he can calculate the percentage of salt in the sample, and thus the percentage water as well.
how does an ice cube particles turn to a gas by laying in the sun?
A pattern that has been established based on verified experimental data that describes an observation but does not provide an explanation as to the reason why said observation occurs is a _________.
Answer:
Hypothesis
Explanation:
This is a hypothesis. A hypothesis is simply a scientific guess to explain a particular phenomenon. It provides different approaches to which an observation can be verified and properly ascertained.
If we can deduce a pattern from a set of experimental data that we have but we have not explained why the observations occur, this is still within the phase of the scientific method called hypothesis.
Answer:
The correct answer will be-scientific law
Explanation:
The experiment is performed to test a tentative explanation or hypothesis which explains the process to a limited extent. The hypothesis when proved through repeated experiments gets transformed either in the scientific law or the scientific theory depending on the quantitative measurement.
The scientific law represents the description of any natural phenomenon by providing the mathematical expressions but it does not provide an explanation to the natural process as provided by the scientific theory.
Since the statement does not provide the explanation but only the description of the natural events therefore, a scientific law is the correct answer.
QUESTION 8
Buffer solutions:
keep the pH of the solution constant even when small amounts of acid or base are added
resist changes in pH when small amounts of acid or base are added
are not used up in buffer reactions and can keep reacting to adjust the pH indefinitely
have no practical uses outside of laboratory conditions
Answer:
B
Explanation:
I would go with B b/c C and D are wrong. The reason C is wrong is that buffers do get used up after a while so it wont be able to react indefinitely to maintain the pH and the reason D is wrong is that there are thousands of uses for buffer ranging from your own human body to thousands and thousands of things.
In my opinion, A is not necessarily wrong because buffer's job is to keep the pH of the solution relatively constant (up to some point), but I think B is still the best answer because it describes the actual function of buffer which is to resist pH.
Final answer:
Buffer solutions resist changes in pH when small amounts of acid or base are added. They protect other molecules from the effects of added acid or base and are critically important in biological systems.
Explanation:
A buffer solution is one which resists changes in pH when small amounts of acid or base are added. Buffer solutions contain both a weak acid and its conjugate base, or a weak base and its conjugate acid. By maintaining a relatively constant pH, buffers protect other molecules in the solution from the effects of added acid or base. These solutions are critically important in biological systems and can be obtained commercially.
Put the following metric units in order from largest to smallest pL, mL, dL, kL
Thank you for your help! God bless
Answer:
kL, dL, mL, pL
Explanation:
pL stands for picoliters. This is equal to 1 × 10⁻¹² (0.000000000001) liters.
mL stands for milliliters. This is equal to 1 × 10⁻³ (0.001) liters.
dL stands for deciliters. This is equal to 1 × 10⁻¹ (0.1) liters.
kL stands for kiloliters. This is equal to 1 × 10³ (1000) liters.
In a double replacement reaction, the ions of two compounds exchange places in an aqueous solution to form to new compounds. true or false
Answer:
The answer to your question is below: True
Explanation:
A double displacement reaction (replacement) is a reaction is which ions are interchanged to forms new compounds. Most of the times one of the products precipitates.
The general equation of this kind of reactions are:
AB + CD ⇒ AD + CB
This is an example of this kind of reactions:
AgNO3 + NaCl → AgCl + NaNO3
The given statement about the double displacement reaction has been true.
In the chemical reaction, the compounds have been dissociated into ions in the aqueous solution. The highly reactive ion will form the bond by displacing the less reactive ion. This type of reaction has been termed the single displacement reaction.
However, when there has been an exchange of the ions of two compounds in the aqueous solution, resulting in a new compound the reaction has been termed a double displacement reaction.
The reaction can be expressed as:
AX + BY [tex]\rightarrow[/tex] AB +XY
Thus, the given statement about the double displacement reaction has been true.
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All of these conditions can cause protein denaturation, except:
high temperatures from cooking.
digestion by pancreatic proteases.
the presence of hydrochloric acid.
a change in blood pH.
an increase in body temperature due to high fever.
Answer:
The correct option is: an increase in body temperature due to high fever
Explanation:
Denaturation of protein is a process by which the protein unfolds i.e. loses it's quaternary, tertiary, and the secondary structure when exposed to high temperature (above 41°C), change in pH or chemical denaturants. Denaturation of proteins leads to loss of activity.
The enzymes pancreatic proteases breaks down proteins by hydrolysis, thus leading to the denaturation of protein.
Since, generally fever does not increase the body temperature above 41°C. Therefore, it doesn't lead to denaturation of protein.
Final answer:
Digestion by pancreatic proteases does not cause protein denaturation; it results in protein hydrolysis, which is the breakdown of proteins into amino acids. Protein denaturation can be reversible unless caused by irreversible changes such as cooking an egg white. Other factors causing denaturation include high temperatures, acidic conditions, and changes in pH.
Explanation:
Protein denaturation occurs when the structure of a protein is altered, leading to a loss of function. Factors that can cause denaturation include high temperatures from cooking, the presence of hydrochloric acid, changes in blood pH, and an increase in body temperature due to fever.
However, digestion by pancreatic proteases does not cause protein denaturation; instead, these enzymes are designed to operate in the digestive system and facilitate the process of protein hydrolysis, breaking down proteins into their constituent amino acids without denaturing them.
Thus, all of the listed conditions can cause denaturation, except for the digestion by pancreatic proteases, which actually serves a different purpose in the body. Protein denaturation is a delicate process, often reversible if the denaturing agent is removed, allowing the protein to resume its function. Some proteins, like those in bacteria that survive in hot springs, are adapted to function at high temperatures and do not denature easily, unlike the albumin protein in egg white which denatures irreversibly when cooked.
Choose the correct order of the lake cycle. River blockage, plain flooding, sediment deposition, bog formation, solid ground plain flooding, river blockage, bog formation, sediment deposition, solid ground river blockage, plain flooding, bog formation, sediment deposition, solid ground plain flooding, river blockage, sediment deposition, bog formation, solid ground
Answer:
plain flooding, river blockage, sediment deposition, bog formation, solid ground
Explanation:
Answer:
plain flooding, river blockage, sediment deposition, bog formation, solid ground
Explanation:
hope it helps
The following five beakers, each containing a solution of sodium chloride (NaCl, also known as table salt), were found on a lab shelf:
Beaker Contents
1) 200. mL of 1.50 M NaCl solution
2) 100. mL of 3.00 M NaCl solution
3) 150. mL of solution containing 19.5 g of NaCl
4) 100. mL of solution containing 19.5 g of NaCl
5) 300. mL of solution containing 0.450 mol NaCl
Arrange the solutions in order of decreasing concentration.
Answer:
The solutions in order of decreasing concentration:
(IV) > (II) > (III) > (I) = (V)
Explanation:
1) 200 mL of 1.50 M NaCl solution - (I)
Concentration of NaCl is given , [NaCl]= 1.50 M
2) 100 mL of 3.00 M NaCl solution - (II)
Concentration of NaCl is given , [NaCl]= 3.00 M
3) 150 mL of solution containing 19.5 g of NaCl - (III)
Moles of NaCl = [tex]\frac{19.5 g}{58.5 g/mol}= 0.3333 mol[/tex]
Volume of solution = 150 mL = 0.150 (1L = 1000 mL)
[tex][NaCl]=\frac{0.3333 mol}{0.150 L}=2.222 M[/tex]
4) 100 mL of solution containing 19.5 g of NaCl - (IV)
Moles of NaCl = [tex]\frac{19.5 g}{58.5 g/mol}= 0.3333 mol[/tex]
Volume of solution = 100 mL = 0.100 (1L = 1000 mL)
[tex][NaCl]=\frac{0.3333 mol}{0.100 L}=3.333 M[/tex]
5) 300 mL of solution containing 0.450 mol NaCl - (V)
Moles of NaCl = 0.450 mol
Volume of solution = 300 mL = 0.300 (1L = 1000 mL)
[tex][NaCl]=\frac{0.450 mol}{0.300 L}=1.50 M[/tex]
The solutions in order of decreasing concentration:
(IV) > (II) > (III) > (I) = (V)
We have 5 beakers with different solutions of NaCl. The order of the solutions in order of decreasing concentration is: 4, 2, 3, 1 = 5.
We have 5 beakers with different solutions of NaCl. To compare their concentrations, we will calculate the molarity of each solution.
1) 200. mL of 1.50 M NaCl solutionThe molarity of the solution is 1.50 M.
2) 100. mL of 3.00 M NaCl solution
The molarity of the solution is 3.00 M.
3) 150. mL of solution containing 19.5 g of NaCl
We will use the following expression.
[tex]M = \frac{mass\ solute }{molar\ mass\ solute \times liters\ solution} = \frac{19.5g}{58.44g/mol \times 0.150L} = 2.22 M[/tex]
4) 100. mL of solution containing 19.5 g of NaCl
We will use the following expression.
[tex]M = \frac{mass\ solute }{molar\ mass\ solute \times liters\ solution} = \frac{19.5g}{58.44g/mol \times 0.100L} = 3.34 M[/tex]
5) 300. mL of solution containing 0.450 mol NaCl
We will use the following expression.
[tex]M = \frac{moles\ solute }{liters\ solution } = \frac{0.450mol}{0.300L} = 1.50M[/tex]
The order of the solutions in order of decreasing concentration is:
4, 2, 3, 1 = 5
We have 5 beakers with different solutions of NaCl. The order of the solutions in order of decreasing concentration is: 4, 2, 3, 1 = 5.
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The pressure of a gas at constant temperature is increased by a factor od 4. By what factor does the volume change?
A 1/4
B 1/2
C 1
D 4
Answer:
A
Explanation:
The formula used is
PV = P1 * V1
P = x
P1 = 4x
V1 = 1
V2 = ?
x * 1 = 4x * V2 Divide both sides by x
x/x = 4x /x * V2
1 = 4*V2 Divide by 4
1/4 = 4*V2/4
1/4 = V2
The answer is A
Final answer:
According to Boyle's Law, at constant temperature, if the pressure of a gas is increased by a factor of 4, the volume decreases by a factor of 1/4.
Explanation:
The question is related to the behavior of gases under varying conditions of pressure and volume at constant temperature, described mathematically by Boyle's Law. Boyle's Law states that at constant temperature, the pressure of a gas is inversely proportional to its volume. Therefore, when the pressure of a gas at constant temperature is increased by a factor of 4, the volume must decrease by that inverse factor. Consequently, the volume would change by a factor of 1/4, making the correct answer A (1/4).
help anyone please ;)
will mark brainliest!!
thank you lol <3
Answer:
The answer to your question is below
Explanation:
2.- 6
3.- Carbon
4.- These electrons can be share to obtain stability.
5.- Protons, electrons
6.- electron cloud
7.- I and III
8.- 1
9.- 8A
10.- 4
11.- F
12.- F
13.- F
14.- T
15.- T
16.- T
17.- T
18.- T (I can not read the question but I think is true)
Need help with this chem question (multiple choice)
Answer:
The correct option is A.
Explanation:
Isomers are molecules with the same formula but different structure. If you look at the previous structures and count the number of C and H, you find that A and the molecule from the question has the same number of C and H, but their structures are different.
This problem has been solved!See the answerFrom the information in this chapter on the mass of the proton, the mass of the electron, and the sizes of the nucleus and the atom, calculate the densities of a hydrogen nucleus and a hydrogen atom. (Radius of hydrogen atom is 1 ✕ 10-8 cm.)Can someone please help with this two part question? I have asked twice on here and I am still getting it wrong on my WebAssign-it's the only one I cannot get!.... Thank you in advance!!density of hydrogen nucleus :
The density of a hydrogen nucleus is approximately 1.24 x 10^17 kg/m^3, and the density of a hydrogen atom is approximately 8.38 x 10^16 kg/m^3.
Explanation:To calculate the density of a hydrogen nucleus, we can use the formula for density, which is mass divided by volume. The mass of a proton is approximately 1.67 x 10^-27 kg, and the volume of a sphere can be calculated using the formula V = (4/3)πr^3. Let's assume the radius of a hydrogen nucleus is equal to the diameter of a proton, which is approximately 1.2 fm. Plugging these values into the formula, we can calculate the density of a hydrogen nucleus.
density = mass / volume = 1.67 x 10^-27 kg / ((4/3)π(0.6 x 10^-15 m)^3) = 1.24 x 10^17 kg/m^3
So, the density of a hydrogen nucleus is approximately 1.24 x 10^17 kg/m^3.
To calculate the density of a hydrogen atom, we need to know its mass and volume. The mass of an electron is approximately 9.11 x 10^-31 kg, and the volume of a sphere can be calculated using the formula V = (4/3)πr^3. Let's assume the radius of a hydrogen atom is equal to the given value, which is 1 x 10^-8 cm. Plugging these values into the formula, we can calculate the density of a hydrogen atom.
density = mass / volume = 9.11 x 10^-31 kg / ((4/3)π(0.5 x 10^-10 m)^3) = 8.38 x 10^16 kg/m^3
So, the density of a hydrogen atom is approximately 8.38 x 10^16 kg/m^3.
During a reaction 24 cubic cm of carbon dioxide was given off. After 8 minutes no more gas was produced and the reaction was complete. What was the rate of this reaction
Answer:
Explanation:
Given parameters:
Volume of CO₂ = 24cm³
time taken for the reaction to complete = 8minutes.
Unknown:
rate of reaction
Soution
The reaction rate is a measure of speed of a chemical reaction. It is often calculated using the expression below:
Reaction rate = [tex]\frac{change in concentration of reactant/product}{time taken}[/tex]
Reaction rate = [tex]\frac{24}{8}[/tex] = 3cm³/min
In this reaction, 3cm³ of carbon dioxide were produced per minute
The study of chemicals and bonds is called chemistry. There are two types of elements and these are metals and nonmetals.
The correct answer 3Cm.
What is carbon dioxide?Carbon dioxide is a chemical compound occurring as an acidic colorless gas with a density about 53% higher than that of dry air. Carbon dioxide molecules consist of a carbon atom covalently double bonded to two oxygen atoms. It occurs naturally in Earth's atmosphere as a trace gasThe data is given as follows:-
Volume of CO₂ = 24cm³Time is taken for the reaction to complete = 8minutes.The reaction rate is a measure of the speed of a chemical reaction. It is often calculated using the expression below:
Reaction rate = [tex]\frac{change\ in\ concentration}{time}[/tex]
Reaction rate =[tex]\frac{24}{8}[/tex] = 3cm³/min
Hence, In this reaction, 3cm³ of carbon dioxide were produced per minute
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Use the periodic table to identify the name or atomic number for each element below. (Give the name, not the chemical symbol, for each element.) hafnium: atomic number : atomic number 15 : atomic number 45 osmium: atomic number magnesium: atomic number
Answer:
hafnium atomic number 72
phosphorus atomic number 15
rhodium atomic number 45
osmium atomic number 76
magnesium atomic number 12
Explanation:
Fermentation has a relatively low atp yield compared to aerobic respiration because
Answer:
Oxidative phosphorylation yields a lot of ATP.
Explanation:
There are two types of respiration:
1. Aerobic respiration
2. Anaerobic respiration
Aerobic respiration
It is the breakdown of glucose molecule in the presence of oxygen to yield large amount of energy. Water and carbon dioxide are also produced as a byproduct.
Glucose + oxygen → carbon dioxide + water + 38ATP
Anaerobic Respiration
It is the breakdown of glucose molecule in the absence of oxygen and produce small amount of energy. Alcohol or lactic acid and carbon dioxide are also produced as byproducts.
Glucose→ lactic acid/alcohol + 2ATP + carbon dioxide
This process use respiratory electron transport chain as electron acceptor instead of oxygen. It is mostly occur in prokaryotes. Its main advantage is that it produce energy (ATP) very quickly as compared to aerobic respiration.
Steps involve in anaerobic respiration are:
Glycolysis
Glycolysis is the first step of both aerobic and anaerobic respiration. It involve the breakdown of one glucose molecule into pyruvate and 2ATP.
Fermentation
The second step of anaerobic respiration is fermentation. It involve the fermentation of pyruvate into lactic acid or alcohol depending upon the organism in which it is taking place. There is no ATP produced, however carbon dioxide is released in this step. Fermentation itself not produced ATP but produce in glycolysis step.
Which of the following elements have unstable electron shells?
A. Hydrogen (H)
B. Chlorine (Cl)
C. Calcium (Ca)
D. All of these
All of these elements have unstable electron shells ,
Due to their unstable electron configurationSo, option D is correct
Hydrogen element stable by gaining or losing one electron .Chlorine element stable by gaining one electron.Calcium element stable by losing two electron.What is unstable electron configuration element ?The atom in which outermost shell which is called valence shell is incomplete is consider as unstable electron configuration atom or element.
learn about unstable electron shell.
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Please help me!!
What is the volume of a salt crystal measuring 5.44 x 10^-2 m, by 2.5 x 10^-3 m, by 7.9 x 10^-3 m?
please explain how you got your answer.
Thank you so much for your help, I appreciate it. God bless
Answer:
The answer to your question is: Volume = 1.074 x 10⁻⁶ m³
Explanation:
Data
Salt crystal measures 5.44 x 10⁻² m ; 2.5 x 10⁻³ m; 7.9 x 10⁻³ m
From the information I suppose it is a cube, then,
Volume of a cube = length x width x height
Volume = 5.44 x 10⁻² m x 2.5 x 10⁻³ m x 7.9 x 10⁻³ m
Volume = 0.000001074 m³
Volume = 1.074 x 10⁻⁶ m³
Important moleculear discoveries in the 1980s have led researchers to hypothesize theat the original vital orgnaic molecule shaping living things was not what was first thought. What molecule is currently supported as the candidate for the vital molecule for earlly life?
Answer:
RNA
Explanation:
Oparin-Haldane hypothesis says that the life gradually arose from amino acids and then they combining to make the complex polymers.
Miller-Urey experiment provided first evidence that the organic molecules needed for the life could be formed from the inorganic components.
Currently, Scientists support RNA world hypothesis. It suggests that first life was the self-replicating RNA. Thus, RNA is vital molecule for the early life.
In two or more complete sentences explain how to balance the chemical equation and classify its reaction type
Answer:
P4+ 3O2 --->2P2O3
Explanation:
left side:
P=4O=2right side :
P=2O=3to balance:
since there is 4 P at left , thus right side need 4P :P2×2 = 2P2 , now u get 4 P at the right and leftsince at right , P2O3 has been ×2 , O2 now has 6 , thus left side need 6 O too :O2×3= 3O2 , now you get 6 O at the left and rightFrom his experiments, J. J. Thomson concluded that cathode ray particles can move at very fast speeds. cathode ray particles can be moved by electric current atoms contain small positively charged particles that are called protons. atoms contain small negatively charged particles that are called electrons.
True / False.
Answer:
False
Explanation:
J. J. Thomson conducted an experiment which lead to the discovery of negatively charged particles only. He took a discharged tube and passed high voltage current through the gas and noticed that some particles from cathode is being emitted. They are fast moving particles and are deviated in the electrical and the magnetic field.
J. J. Thomson did not conclude anything about the positive charge. Hence, the statement is false.
Two containers hold the same radioactive isotope. Container A contains 1000 atoms, and container B contains 500 atoms. which container has greater radioactive decay?The rate of decay of atoms in container A is greater than the rate of decay of atoms in container B.
Answer:
The rate of decay of atoms (half-life) in container B is the same as the rate of decay of atoms (half-life) in container A.
A student measures the volume of a liquid in a graduated cylinder of 250 mL capacity, and finds the volume of the liquid to be 200 mL. The student transfers the liquid to a graduated cylinder with a capacity of 500 mL. What is the volume of the liquid in the 500 mL cylinder?
A. unknown
B. 100 mL
C. 200 mL
D. 500 mL
Answer:
Option C = 200 mL
Explanation:
The volume of liquid remain same because students just transfer the liquid from the graduated cylinder with the capacity 250 mL to the graduated cylinder having the capacity of 500 mL. The volume of the liquid will remain same either it is in the large graduated cylinder or in a small graduated cylinder.
Vanillin (used to flavor vanilla ice cream and other foods) is the substance whose aroma the human nose detects in the smallest amount. The threshold limit is 2.0 × 10−11 g per liter of air. If the current price of 50.0 g of vanillin is $115, determine the cost to supply enough vanillin so that the aroma could be detected in a large aircraft hangar with a volume of 5.47 × 107 ft3.
Answer:
[tex]\boxed{\text{\$0.07}}[/tex]
Explanation:
1. Convert cubic feet to litres
[tex]V =5.47 \times 10^{7} \text{ ft}^{3} \times \dfrac{\text{28.32 L}}{\text{1 ft}^{3}} = 1.549 \times 10^{9}\text{ L}[/tex]
2. Calculate the mass of vanillin
[tex]m = 1.549 \times 10^{9}\text{ L} \times \dfrac{2.0 \times 10^{-11}\text{ g}}{\text{1 L}} = \text{0.030 98 g}[/tex]
3. Calculate the cost of the vanillin
[tex]\text{Cost} = \text{0.03098 g} \times \dfrac{\textbf{\$115 }}{\text{50.0 g}} = \text{\$0.07}\\\text{The cost of the vanillin is $\boxed{\textbf{\$0.07}}$}[/tex]
The cost of the Vanillin is $0.07.
What is vanillin used for?
it is utilized in flavorings, foods, perfumes, and pharmaceuticals. Vanillin is used as a chemical intermediate in the manufacture of several essential pills and different merchandise. Human publicity to vanillin is through dermal contact with perfumes and ingestion of meal products that consist of vanillin as a flavor additive.
Is vanillin dangerous for your fitness?Vanillin is thought to release numerous substances whilst burnt. these consist of polycyclic fragrant hydrocarbons, that have been classed as human cancer-causing agents through the global corporation for studies on most cancers.
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A base a. causes phenolphthalein indicator to change from colorless to pink. b. donates a proton in a proton transfer reaction. c. accepts electrons in an electron transfer reaction. d. produces hydrogen ions in solution. e. does none of the above.
Answer: a. causes phelophtalein indicator to change from colorless to pink
Explanation:
Phenolphtalein is an indicator, which means it can visually change when given certain circumstances.
Phenolphtalein turns fuchsia when exposed to basic substances, especially above a pH of 8.2, due to ionization, which changes the structure of the indicator.
State whether or not the following equation is balanced: FeO + Al → Fe + Al2O3
If it is not balanced, explain why and provide the balanced equation.
Answer: 3 FeO + 2 Al -> 3 Fe + Al2O3
Explanation:
In order to verify if it is balanced or not you need to count the element at the left and the right. If they arent the same it isnt balanced.
And to balance the equation (simple method, not using redox) you assign coef 1 to the compound with more number of elements Al2O3 in this case and then you complete the rest
A frictionless piston-cylinder device contains 2 kg of nitrogen at 100 kPa and 300 K. Nitrogen is now compressed H slowly according to the relation PV1.4 = constant until it reaches a final temperature of 360 K. Calculate the work El input during this process.
Answer:
254
Explanation:
Which of the following characteristics are true about a typical peptide (amide) bond?
The bond is planar.
There is free rotation about the carbonyl carbon and nitrogen bond.
There is substantial double-bond character to this bond.
There is a net negative charge on nitrogen and net positive charge on oxygen.
Answer:
The bond is planar. There is free rotation about the carbonyl carbon and nitrogen bond.
Explanation:
The peptide bond is planar and for this reason there is free rotation about the carbonyl carbon and nitrogen bond. Peptide bonds don't have double-bonds or delocalized electrons in their structure. Both oxygen and nitrogen have a net negative charge on the peptide bonds.
A peptide bond is planar, does not allow free rotation due to its double-bond character, and has no net charge under physiological conditions.
Explanation:The characteristics of a typical peptide (amide) bond are as follows:
The bond is planar. This is because of the resonance or delocalization of the peptide bond.There is not free rotation about the carbonyl carbon and nitrogen bond. This is due to the double-bond character of the peptide bond caused by the resonance.A peptide bond has a double bond character which gives it its planar structure.There is no net charge on either the nitrogen or the oxygen in a peptide bond under physiological circumstances i.e. pH 7.4. So, the last statement that nitrogen has a net negative charge and oxygen has a positive charge is not correct.Learn more about Peptide Bond here:https://brainly.com/question/35560541
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The identity of an element depends on the number of protons and neutrons in the nucleus. protons in the atom. neutrons in the atom. electrons in the atom.
Answer:
protons in the atom.
Explanation:
The identity of an element relies on the number of protons in its atom. This is called the atomic number. The atomic number is the basis of the periodic table of elements. Modern periodic law states that "the properties of elements are a periodic function of their atomic number".
Atomic number of atoms do not change and they are convieniently used in identifying an atom.
Answer:
protons in the atom
Explanation:
You have been hired as a chemist. Your first task at your new job is to examine a newly discovered atom. The paperwork you are given states that its atomic number is 110. What does this mean?
A. The atom contains 55 electrons
B. The atom contains 50 electrons and 50 neutrons
C. The atom contain 110 protons
D. All of the above
E.None of the above
A large number of molecules begin moving very fast, rarely bumping into one another, and taking up the entire space available to them. As the temperature drops and the kinetic energy of the particles decreases, the particles move more slowly and run into each other more often. They eventually form a lattice structure, only slightly moving. What is this process called?
Vaporization, then condensation
Sublimination, then freezing
Freezing
Condensation, then freezing
Decrease in temperature
Answer: Condensation, then freezing is the correct option.
Explanation:
Condensation is defined as the process in which vapor state of a substance changes into liquid state.
Vaporization is defined as the process in which liquid state of a substance changes into vapor state.
Freezing is defined as the process in which liquid state of a substance changes into solid state.
Sublimation is defined as the process in which a solid changes directly into vapor state without undergoing liquid state.
In a solid, particles are arranged in a crystal lattice as they are held together by strong intermolecular forces of attraction due to which these molecules are unable to move from their mean position.
So, in the given situation when the particles move more slowly and run into each other more often. They eventually form a lattice structure, only slightly moving. Then it means substance has first changed into liquid state and then finally it became a solid.
Thus, we can conclude that this process is called condensation, then freezing.