Why are metals malleable?
a
They are shiny.
b
The electrons are delocalized and able to move between the atoms.
c
The electrons are held tightly within the lattice structure making it strong.
d
The electrons are shared between two metal ions and this holds the atoms together.
Answers
Answer:
b is the anwer
Explanation:
the option is the explanation
Related Questions
The first eight ionization energies of a third row element are 999.6, 2252, 3357, 4556, 7004, 8496, 27107, and 31719 kJ/mol. Identify the element.
Answers
The first eight ionization energies of a third row element are 999.6, 2252, 3357, 4556, 7004, 8496, 27107, and 31719 kJ/mol. The element is S.
Hence, Option C is correct answer.
What is Ionization Energy ?Ionization energy is the energy that an electron in a isolated gaseous atom or ion in the ground electronic state must absorb to discharge an electron resulting in a cation.
Which element belongs to third row or period ?The third row element are Na, Mg, Al, Si, B, S, Cl, Ar
From the given options these elements belongs to third row Na, Mg, Al, Si, S, Cl, Ar.
Now check the first eight ionization energy of each element.
Na: 496, 4562, 6910, 9543, 13354, 16613, 20117, 25496 kJ/mol
Mg: 738, 1451, 7733, 10543, 13630, 18020, 21711, 25661 kJ/mol
Al: 578, 1817, 2745, 11577, 14842, 18379, 23326, 27465 kJ/mol
Si: 787, 1577, 3232, 4356, 16091, 19805, 23780, 29287 kJ/mol
S: 999.6, 2252, 3357, 4556, 7004, 8496, 27107, 31719 kJ/mol
Cl: 1251, 2298, 3822, 5159, 6542, 9362, 11018, 33604 kJ/mol
Ar: 1521, 2666, 3931, 5771, 7238, 8781, 11995, 13842 kJ/mol
Thus from the above conclusion we can say that The first eight ionization energies of a third row element are 999.6, 2252, 3357, 4556, 7004, 8496, 27107, and 31719 kJ/mol. The element is S.
Hence, Option C is correct answer.
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Question: The first eight ionization energies of a third row element are 999.6, 2252, 3357, 4556, 7004, 8496, 27107, and 31719 kJ/mol. Identify the element.
Choose One:
A. Mg
B. Cl
C. S
D. P
E. Al
F. Ar
G. Na
H. Si
A comb is rubbed with a piece of wool fabric and placed next to some scraps of paper.
The paper moves toward the comb. The movement of the paper is caused by —
static electricity
magnetic attraction
mechanical energy
chemical energy
Answers
Answer: static electricity
Explanation: rubbing the comb creates. Static charge to comb
The pH at the equivalence point in any titration is the pH of the salt solution formed. At the equivalence point of the titration, the solution contains sodium benzoate and water. The passage states that benzoic acid is a weak acid; therefore, its conjugate base, the benzoate anion, is a stronger base than OH- and reacts with water to produce OH- and undissociated benzoic acid. The resulting solution then has a pH > 7, because of the hydroxide ions produced by this reaction. The reaction of an ion such as benzoate ion with water is called hydrolysis.
A. < 4
B. > 4 and < 7
C. = 7
D. > 7
Answers
Answer:
D. > 7
Explanation:
Benzoic acid, HX, is a weak acid that reacts with OH- as follows:
HX + OH- → X- + H2O
Where X- is produced, the conjugate base of benzoic acid.
As benzoic acid is a weak acid, benzoate ion is a strong base. A strong base has pH > 7. Right option is:
D. > 7
water is a highly polar molecule with strong hydrogen bonding. one of the results of this is that water can climb up a narrow tube. the phenomenom is known as:
A. catapult action (aka trebuchet onfire)
B. capillary action
C. carpel tunnel syndrom
D. capitalization
Answers
Answer:
Option B, Capillary action
Explanation:
Water molecules attach with the molecules of the surface of the container in which they are kept. This is because of the cohesive force within the molecules of water and adhesive force between the molecules of water and other substances.
The water rises up in a capillary tube because of water molecules adhere at the edges thereby creating a meniscus in the upside turned direction. The surface is kept intact by the surface tension
Now capillary action specifically occurs when adhesion to the surface of the container is higher than the cohesion between the water molecules.
Hence, option B is correct
fungi have eukaryotic cells (large cells with a nucleus), like animals and plants
True or false?
Answers
The first ionization energies of the elements ______ as you go from left to right across a period of the periodic table, and ______ as you go from the bottom to the top of a group in the table.
A.) increase, decrease
B.) decrease, increase
C.) decrease, decrease
D.) unpredictable, unpredictable
E.) increase, increase
Answers
The correct answer to the question is: A) increase, decrease
The first ionization energies of the elements increase as you go from left to right across a period of the periodic table, and decrease as you go from the bottom to the top of a group in the table.
1. Going from left to right across a period, the atomic number increases, which means there are more protons in the nucleus. This results in a stronger attraction between the positively charged nucleus and the negatively charged electrons. As a result, it becomes harder to remove an electron, requiring more energy, and therefore the first ionization energy increases.
2. Going from the bottom to the top of a group, the atomic size decreases. This is because the number of energy levels or shells decreases, and the electrons are closer to the nucleus. As the distance between the nucleus and the outermost electrons decreases, the attractive force between them increases. Consequently, it becomes easier to remove an electron, requiring less energy, and therefore the first ionization energy decreases.
Therefore, the correct answer to the question is:
A) increase, decrease
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What will happen if you put a metal object to the beaker??
Answers
Answer:
umm i guess if there is a liquid inside it would rise to the top and the metal would sink to the bottom
Neeeeeeeedddddd hellllllllllppppppp
Answers
what element is 1s2 2s2 2p3
Answers
7. Calculate: Turn off Show most probable velocity and Show mean velocity. Select Hydrogen and set the Temperature to 100 K. You can calculate the most probable velocity (vp), mean velocity ( ), and root mean square velocity (vrms) using the following formulas: In each formula, R stands for the universal gas constant, or 8. 3144 J / K mol, T stands for Kelvin temperature, and M stands for the molar mass, in kg / mol. Hydrogen gas (H2) has a molar mass of 0. 002016 kg / mol. A. Calculate the most probable velocity (vp): ____________________ B. Check by turning on Show most probable velocity. Were you correct
Answers
The most probable velocity of hydrogen gas at 100 K is approximately 1809.46 m/s.
To calculate the most probable velocity (vp) of hydrogen gas \((H_2)\) at 100 K, we can use the following formula:
\(vp = (2RT/\pi M)^{(1/2)}\)
where R is the universal gas constant (8.3144 J/K*mol),
T is the temperature in Kelvin (100 K),
π is pi (3.14159),
and M is the molar mass of hydrogen gas (0.002016 kg/mol).
Putting in the values, we get:
\(vp = (2 * 8.3144 J/K*mol * 100 K / \pi * 0.002016 kg/mol)^{(1/2)}\\vp = 1809.46 m/s\)
Therefore, the most probable velocity of hydrogen gas at 100 K is approximately 1809.46 m/s.
To check if the answer is correct, we can turn on Show most probable velocity. If the calculated value matches the displayed value, then we know we are correct.
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Sooner or later your new school won't feel so strange.get.
Answers
I'm hoping the same for my new coaching classes
This is my first time going out to study ngl-
50 POINTS pls answer the full thing<333 i will report if you don't (will mark barinliest)
Some greenhouse gases, such as fluorocarbons (CFCs, HFCs, PFCs, etc.), are human-made. Others, such as water, methane, and carbon dioxide, are naturally produced. Which type of greenhouse gas (human-made or natural) is more difficult to control and eliminate? Which types are easier? In three to five sentences, provide evidence for your argument.(4 points)
Wetlands are able to remove nutrients and chemicals from water as the water flows through the area. A developer is planning to destroy most of the wetlands near a bay. In three to five sentences, explain how destroying the wetlands would impact the bay’s water quality and ecosystem.(4 points)
Commercial agriculture can often lead to water-quality problems. In one to two sentences, explain how two of those problems occur.(2 points)
Answers
Destroying the wetlands would result in a significant decline in the bay's water quality and ecosystem. Wetlands are natural filters that remove nutrients and chemicals from water as it flows through the area. By destroying the wetlands, the water quality of the bay would decline as pollutants and chemicals would no longer be filtered out. This would have a significant impact on the bay's ecosystem, as many species rely on the bay's water quality to survive.
Two water-quality problems that can arise from commercial agriculture are eutrophication and contamination from pesticides and fertilizers. Eutrophication is the process by which excess nutrients enter a body of water, leading to the growth of algae and other aquatic plants. This can lead to a depletion of oxygen in the water, which can harm aquatic life. Pesticides and fertilizers used in commercial agriculture can also contaminate water sources, leading to health problems for humans and animals that rely on the water.
The half-life of the radioactive element unobtanium-31 is 10 seconds. If 176 grams of unobtanium-31 are initially present, how many grams are present after
10 seconds?
20 seconds?
30 seconds?
40 seconds?
50 seconds?
Answers
After 10 seconds, 88 grams of unobtanium-31 are present, after 20 seconds, 44 grams are present, after 30 seconds, 22 grams are present, after 40 seconds, 11 grams are present, and after 50 seconds, 5.5 grams are present.
The amount of unobtanium-31 remaining after certain intervals of time, given that the half-life of the radioactive element is 10 seconds is calculated below.
Initial quantity of the element is given as 176 grams.
After 10 seconds:
Let's first figure out the fraction of the sample remaining after each time period because the half-life of a radioactive element tells us the fraction that decays over a certain period of time.
Using the half-life equation:
amount remaining = original amount x (1/2)^(time elapsed / half-life)
After 10 seconds, the time elapsed is equal to the half-life of the element,
So:
amount remaining = 176 x (1/2)^(10/10)
= 88 grams
After 20 seconds:
amount remaining = 176 x (1/2)^(20/10)
= 44 grams
After 30 seconds:
amount remaining = 176 x (1/2)^(30/10)
= 22 grams
After 40 seconds:
amount remaining = 176 x (1/2)^(40/10)
= 11 grams
After 50 seconds:
amount remaining = 176 x (1/2)^(50/10)
= 5.5 grams
Therefore, after 10 seconds, 88 grams of unobtanium-31 are present, after 20 seconds, 44 grams are present, after 30 seconds, 22 grams are present, after 40 seconds, 11 grams are present, and after 50 seconds, 5.5 grams are present.
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In a radio, ______ energy is transformed into ______ energy.
Answers
Answer:
In a radio, chemical energy is transformed into sound energy
Cifras significativas de 63,000
Answers
Answer:
Cifras significativas de 63,000
Result 63000
Sig Higos 2 (63000)
Decimales 0
Notación cientifica 6.3 × 104
Notación electrónica 6.3e+4
Palabras sesenta y tres mil
An atom has 8 protons, 9 neutrons, and 8 electrons. this atom has an atomic number of?
Answers
An atom has 8 protons, 9 neutrons, and 8 electrons then atomic number will be 8.
Proton can be defined as the particle which present in nucleus. it has positive charge.
Atomic number can be determined by the count of proton which occur in a particular atom.
It can be written as:
Number of proton = atomic number
8 = atomic number.
It is mentioned that the count of proton is 8 hence, the atomic number will be 8.
By adding count of protons and count of neutron, atomic mass can be calculated.
Therefore, atomic number will be 8.
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identify the following compounds as ionic (i) or covalent (c)
a) CO2
b) FeCl3
c) LiBr
d) C2H4
e) NaCl
f) SO3
g) KCl
h) P2O5
Answers
CO2 - Covalent
FeCl3 - Ionic
LiBr - Ionic
C2H4 - Covalent
NaCl - Ionic
SO3 - Covalent
KCl - ionic
P2O5 - Covelent
What are ionic compounds?Ionic compounds are compounds consisting of positively charged ions (cations) and negatively charged ions (anions) held together by ionic bonds. They typically have high melting and boiling points, are crystalline solids at room temperature, and are good conductors of electricity when dissolved in water or melted.
The covalent compounds on the other had are not made up of the ions and they are the ones that are not soluble in water.
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what is a radioactive isotope
Answers
Answer:
radionuclide is an atom that has excess nuclear energy, making it unstable. This excess energy can be used in one of three ways: emitted from the nucleus as gamma radiation; transferred to one of its electrons to release it as a conversion electron; or used to create and emit a new particle from the nucleusAnswer:
Is a atom that has to much nuclear energy. Which makes it unstable
Staci ordered a frozen yogurt cone. The picture shows the frozen yogurt cone after Staci was finished and ran off to play. A partially melt yogurt in a cone. Which statement correctly describes the particles that make up the yogurt cone shown? A. The particles move slower and vibrate in place in the melted yogurt. B. The particles stop moving when the yogurt is completely melted. C. The particles move faster and slide past each other in the melted yogurt. D. The particles in the yogurt move only if the temperature changes suddenly.
Answers
According to the forces of attraction, in the frozen yogurt which is melted the particles move faster and slide past each other in the melted yogurt.
What are forces of attraction?Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
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anyone? got an answer
Answers
If a sample of coffee had 38.63 grams of caffeine (C8H10N4O2), how many atoms of nitrogen are present?
scientific notation is written as
ex. (6.022*10^23)
Answers
There are 38.63 grams of caffeine, which is equal to 6.69 x 10^-2 moles of caffeine.
What is caffeine?Caffeine is a stimulant found in coffee, tea, energy drinks, and some sodas. It is a naturally occurring substance found in the leaves, seeds, and fruits of over 60 plants, including coffee beans and cocoa beans. Caffeine works by blocking the effects of adenosine, a neurotransmitter that makes us feel sleepy. It also increases the production of other neurotransmitters, like dopamine and norepinephrine, which can make us feel more alert and focused.
Since the molar mass of caffeine is 194.19 g/mol, there are 6.69 x 10^-2 mole of caffeine, which is equal to 3.4 x 10^23 atoms of caffeine. Since one mole of caffeine contains 4 atoms of nitrogen, there are 3.4 x 10^23 atoms of nitrogen present in the sample of coffee.
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equal volumes of 0.1 m agno3(aq) and 2.0 m nh3(aq) are mixed and the reactions represented above occur. which ag species will have the highest concentration in the equilibrium system shown below, and why?
Answers
The reaction between AgNO3 and NH3 has the following chemical equation for balance: Ag(NH3)2+ + NO3- from AgNO3 + 2NH3. As a result, the silver-ammonia complex will contain the majority of the silver ions in the equilibrium system.
AgNO3, or silver nitrate, is a chemical that is frequently utilised in a variety of industries, including photography, medicine, and scientific research. It is a white, crystalline solid that dissociates into silver ions and nitrate ions in water. It is also extremely soluble in water. Halide ions in solution are frequently detected using the reagent AgNO3, which reacts with them to produce visually identifiable insoluble silver halides. Additionally employed as an antiseptic in medicine, AgNO3 is applied topically to treat skin diseases including warts and burns. It is also a typical precursor for the creation of additional silver compounds.
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Answer:
Ag(NH3)2+ (aq)
Explanation:
Because Kep3 will equal 1.6 x 10^7
how to calculate formula for molality?
Answers
To calculate the formula for molality, you need to know the following:
The amount of solute in moles (represented by "n")
The mass of the solvent in kilograms (represented by "m")
Once you have these values, you can use the following formula to calculate the molality (represented by "b"):
molality (b) = n / m
Here's an example of how to use this formula:
Suppose you have 0.05 moles of sodium chloride (NaCl) dissolved in 500 grams of water (H2O). To calculate the molality of the solution, you can follow these steps:
Convert the mass of water from grams to kilograms:
mass of water (m) = 500 grams = 0.5 kilograms
Calculate the amount of solute in moles:
amount of solute (n) = 0.05 moles
Use the formula to calculate the molality:
molality (b) = n / m = 0.05 moles / 0.5 kg = 0.1 mol/kg
Therefore, the molality of the sodium chloride solution is 0.1 mol/kg.
Molality is a useful way of expressing the concentration of a solution, especially in situations where the temperature of the solution may change. Unlike molarity, which is expressed in units of moles per liter, molality is expressed in units of moles per kilogram, which is independent of temperature.
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How does an enzyme’s active site relate to its substrate?
Answers
Answer:
The enzyme's active site must be the mold shape of the substrate.
Explanation:
An enzyme and a substrate bind together in order to work. If the shapes of the 2 are different, they will not be able to bond together. If the shapes of the 2 fit glove-in-hand, then they will be able to bond together.
Which is the mass of 0.13 moles of potassium chloride, KCl
Answers
Answer:
9.69 grams
Explanation:
e
Answer:
9.69g KCl
Explanation:
\(0.13 molesKCl\frac{74.55gKCl}{1moleKCl} =9.69gKCl\)
What is the frequency of a red laser that has a wavelength of 676 mn
Answers
The frequency of a red laser that has a wavelength of 676 nm would be 4.43 x \(10^{14\) hertz.
Frequency of wavesThe frequency and wavelength of a wave are related by the following equation:
λf = c
Where λ is the wavelength of the wave in meters, f is the frequency in Hertz, and c is the speed of light in a vacuum.
in this case, λ = 676 nm = 6.76 x \(10^{-7\) m
c = 299,792,458 m/s
Making f the subject of the formula:
f = c/λ
= 299,792,458/6.76 x \(10^{-7\)
= 4.43 x \(10^{14\) hertz
In other words, the frequency of a red laser that has a wavelength of 676 nm would be 4.43 x \(10^{14\) hertz.
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Which type of molecule is octanal?
A. Alcohol
B. Ketone
C. Amine
D. Aldehyde
Answers
the ending (al) tells you that. alcohols end in “ol”, ketones end in “one”, amines have 2 different ways of naming so i suggest finding which one you want to use, and aldehyde end in “al” :)
In fruit flies, red eyes are dominant (E). White eyes are recessive (e). If the female fly has white eyes and the male fly has homozygous dominant red eyes, what are the possible phenotypes and genotypes of their offspring?
Answers
The fruit fly female must be homozygous recessive for the gene encoding for eye color because she has white eyes. (ee).
How are genotypes determined?The male fly has homozygous red eyes that are dominant. (EE). As a result, each of their children will have one allele from each parent, giving each of them the genotype Ee.
All progeny will have the dominant of red eyes because the red eye allele (E) is dominant over the white eye allele (e). As a result, although having distinct genes, every child will inherit the identical phenotypic of red eyes. (Ee).
As a result, all of the offspring's potential phenotypes—red eyes and heterozygous genotypes—are possible. (Ee).
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Which drink(acid or base) would be the best for someone who has a stomach ulcer? Explain your response using evidence shown from the class notes. Write your response in complete sentences.
Answers
The best types of drinks for someone having a stomach ulcer are basic drinks.
If someone is having stomach ulcer they should avoid acidic drinks as they can cause further irritation in the stomach lining and can cause more pain to the person. Instead of acidic drinks one can prefer basic drinks as they are more helpful and consuming them can help in neutralizing the excess acid in the stomach.
Based on the class notes we know that on the PH scale, basic drinks have a ph value greater than 7 and acidic drinks have a ph value less than 7. For someone having a stomach ulcer he or she needs to consume basic drinks more or drinks whose ph value is greater than 7 because it helps them to reduce the acids in the stomach.
Examples of basic drinks are milk, soy milk, almond milk, and herbal tea. On the other hand examples of acidic drinks are: citrus juices, soda, and energy drinks.
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2003 Q 2 Study the information in the table and answer the questions that follow lon Electronic Ionic arrangement radius Na 2.8 0.095 K K 2.8.8 0.133 Mg? 2.8 0.065 Explain why the ionic radius of K* is greater than that of Na*
Answers
Answer:
Hence
potassium (k) is 2,8,8,1
sodium (Na) is 2,8,1
potassium will have a higher Ionic radius than sodium
Explanation:
Ionic radius has a trend
it increases down the group
and decreases across the period