Antimony
Explanation:
The element with this ionization energies is antimony, Sb.
This is because the element has 5 ionization energies.
IE1 579
IE2 1814
IE3 3740
IE4 12479
IE5 14840
Ionization energy is the amount of energy required for the removal of an electron in an atom.
Each shell in an atom have their own respective ionization energies that increases as we penetrate into the atom.
An atom with 5 ionization energies suggests that it has 5 shells. Only Antimony in group 5a has five shells because it belongs to the fifth period.learn more:
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Waves interact with different surfaces in different ways. Waves often bounce off objects such as water. What is this form of wave movement called?
A.
refraction
B.
resonance
C.
reflection
D.
interference
When light fall on the different object. There will be an interaction between light and matter. It may happen interaction, reflection, refraction. Wave bounce off process is known as reflection.
What is reflection?If the surface is smooth and shiny, like glass, water or polished metal, the light will reflect at the same angle as it hit the surface. Reflection is the change in direction of a wave at the surface of two different media so that the wave returns into the medium from the same.
Refraction light waves change speed when they pass across the two substances with different density. Resonance is when electromagnetic waves can make thing vibrate. Interference is not bounce off phenomena.
Light have dual nature, sometime it behaves as a particle and sometimes it behaves as a wave.
Thus, the bounce back of the light is called the reflection of light.
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Which are characteristics of medusae?
are sessile, have tentacles, mouths open downward
swim freely, lack tentacles, mouths open upward
swim freely, have tentacles, mouths open downward
are sessile, lack tentacles, mouths open upward
The correct characteristics of medusae are: swim freely, have tentacles, mouths open downward.
Medusae are the free-swimming, jellyfish-like form of certain aquatic animals, typically found in the phylum Cnidaria. They are characterized by their ability to swim freely in the water, which distinguishes them from the sessile, or immobile, polyps that are another life stage of cnidarians. Medusae have tentacles that hang down from their bell-shaped bodies, which they use to capture prey. These tentacles are often equipped with stinging cells called nematocysts that help to immobilize their prey. The mouth of the medusa is located on the underside of the body, facing downward, and leads to a gastrovascular cavity where digestion takes place.
To summarize, the following are the characteristics of medusae:
- Swim freely: Medusae are capable of locomotion and can move through the water column.
- Have tentacles: They possess tentacles that extend from their bodies, which are used for capturing food.
- Mouths open downward: The mouth is situated on the ventral side of the medusa, facing downward, which is suitable for bringing captured prey into the gastrovascular cavity for digestion.
The other options listed do not accurately describe medusae:
- Are sessile: This is incorrect because medusae are free-swimming, not immobile.
- Lack tentacles: This is incorrect because tentacles are a defining feature of medusae.
- Mouths open upward: This is incorrect because the mouth of a medusa opens downward.
What type of particles flow between objects when they are charged by friction or conduction?
A.
protons
B.
quarks
C.
neutrons
D.
electrons
Answer:
d.electrons
Explanation:
The human activities in two locations are described below:
Location A: Rampant use of plastic containers
Location B: Excessive use of pesticides and fertilizers Which statement is most likely true?
A. Location A will have poor air quality because plastic is biodegradable.
B. Location A will experience water scarcity because plastic absorbs moisture. C. The population of honeybees will increase in Location B because production of crops will increase.
D. The population of fish in Location B will decrease because the water is contaminated.
Answer:
B location A will experience water scarcity because plastic absorbs
Explanation:
Answer: I believe its D
Explanation:
Im doing the science test rn
A substance is found to be reactive, flammable, soluble, and explosive. Which of these observations is a physical property?
A.
reactive
B.
explosive
C.
flammable
D.
soluble
Answer: D
Explanation:
it says so on google
Select the correct answer from each drop-down menu.
Complete the statements about the nature of scientific knowledge.
Among the different types of scientific knowledge, are likely to be modified or discarded most frequently. Long ago, in the 1600s, scientists discarded the phlogiston theory because
Answer:
Among the different types of scientific knowledge hypotheses are likely to be modified or discarded most frequently. Long ago in the 1600's scientists discarded the phlogiston theory because the new evidence didnt support it.
Explanation:
Hypothesis is the assumption of something possible or impossible to draw a consequence and is provisionally established as the basis for an investigation and which can confirm or deny its validity. For this reason, within scientific research, hypotheses are so important and so changeable that they are modified or discarded more frequently within scientific knowledge.
Based on a work by Johann Joachim Becher, the German scientist Georg Ernst Stahl created the phlogiston theory that said combustion occurred with certain materials because they had an “element” or a common flammable principle that was released at the time of burning . This theory was abandoned because there was no evidence, even through scientific experiments, to prove that this theory is true.
Hypotheses are likely to be modified or discarded most frequently in scientific knowledge. Phlogiston theory was discarded due to evidence contradicting its predictions.
Explanation:Among the different types of scientific knowledge, hypotheses are likely to be modified or discarded most frequently. Long ago, in the 1600s, scientists discarded the phlogiston theory because evidence contradicted the predictions made by the theory. Phlogiston theory proposed that a substance called phlogiston was released during combustion, but experiments showed that substances gained weight instead of losing weight during combustion.
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How is n1 in the Rydberg equation related to the quantum number n in the Bohr model?How is n1 in the Rydberg equation related to the quantum number n in the Bohr model?
Answer: The n in Bohr model of the atom is principle quantum number.
The Rydberg n integer stats represent electron orbits at various integral distances from the atom in Bohr's conceptualization of the atom. Subsequent models discovered that the values for n1 and n2 match the two orbitals ' principle quantum numbers.
Explanation: pls mark brainliest :,)
Final answer:
In the Rydberg equation, n1 is related to the principal quantum number n in the Bohr model, where n1 is the lower energy level an electron transitions from, and n2 is the higher energy level it transitions to.
Explanation:
In the Rydberg equation, n1 and n2 represent the principal quantum numbers corresponding to the initial and final energy levels of an electron in a hydrogen atom, respectively. When an electron transitions between these energy levels, it emits or absorbs a photon whose energy corresponds to the difference in energy between these levels.
The Bohr model describes an electron's energy levels in terms of quantum numbers; thus, the quantum number n in the Bohr model is directly related to n1 and n2 in the Rydberg equation. Specifically, n1 corresponds to the lower energy level (initial state) and n2 to the higher energy level (final state) of an electron's transition.
For example, in the Balmer series, the final energy level nf is always 2, while the initial level ni is greater than nf (e.g., ni = 3, 4, 5, ...). The transitions between these levels give rise to visible light of specific wavelengths, as dictated by the Rydberg formula.
How many moles of NaCl will be produced from 83.0g of Na, assuming Cl2 is available in excess?
Answer: The number of moles of [tex]NaCl[/tex] produced will be, 3.61 moles.
Explanation : Given,
Mass of [tex]Na[/tex] = 83.0 g
Molar mass of [tex]Na[/tex] = 23 g/mol
First we have to calculate the moles of [tex]Na[/tex]
[tex]\text{Moles of }Na=\frac{\text{Given mass }Na}{\text{Molar mass }Na}[/tex]
[tex]\text{Moles of }Na=\frac{83.0g}{23g/mol}=3.61mol[/tex]
Now we have to calculate the moles of [tex]NaCl[/tex]
The balanced chemical equation is:
[tex]2Na+Cl_2\rightarrow 2NaCl[/tex]
From the reaction, we conclude that
As, 2 mole of [tex]Na[/tex] react to give 2 mole of [tex]NaCl[/tex]
So, 3.61 mole of [tex]Na[/tex] react to give 3.61 mole of [tex]NaCl[/tex]
Therefore, the number of moles of [tex]NaCl[/tex] produced will be, 3.61 moles.
Answer:
2.57
Explanation:
Which of the following changes to a pipe would increase the conductance by a factor of 12?
A. Quadrupling the length and tripling the radius.
B. Reducing the length by a factor of and doubling the radius.
C. Tripling the length and reducing the radius by a factor of .
D. Reducing the length but a factor of and doubling the radius.
C. Tripling the length and reducing the radius by a factor of 2 is the change to a pipe would increase the conductance by a factor of 12.
Explanation:
As we know that the resistance is directly proportional to the length of the pipe and it is inversely proportional to the cross sectional area of the pipe.
So it is represented as,
R∝ l /A [ area is radius square]
So k is the proportionality constant used.
R = kl/A
Conductance is the inverse of resistance, so it is given as,
C= 1/R.
R₁ = kl₁ / A₁
R₂ = kl₂/A₂
R₂/R₁ = 1/12 [∵ conductance is the inverse of resistance]
= l₂A₁ / l₁A₂
If we chose l₁/l₂= 3 and A₂/A₁= 4 So R₂/R₁= 1/3×4 = 1/12
So tripling the length and reducing the radius by a factor of 2 would increase the conductance by a factor of 12.
Answer:
Reducing the length by a factor of 1/3 and doubling the radius.
Explanation:
this is correct answer, my assignment says
Which event signals the birth of a star?
Answer:
Its c.
Explanation:
When the density and temperature at the core of the gravitationally collapsing nebula reaches values when nuclear fusion is triggered and sustained, that marks the birth of the star.
‘ you don’t likeee me dasss fineee kk byeee’
How can chemical weathering contribute to physical weathering?
A-leads to the abrasion of rocks and minerals
B-increases the surface exposed to the atmosphere
C-increases the temperature of rocks and soils
D-decreases the amount of biological activity acting on a rock
Under which of the following conditions would chemical weathering rates be highest?
A-dense vegetation cover
B-large grain size
C-rocks made predominantly of silicate minerals
D-constant cold temperatures
Buildings and statues made of stone are subject to the same degree of weathering as rocks in the natural environment.
True or false?
Answer:1. A. 2.C 3.true
Explanation:
How many moles are in 250 grams of carbon dioxide gas
Answer:
5.68 mol of CO₂
Explanation:
Mole is a chemical unit used to determine the amount of a substance also referred as chemical amount. Also, it represents 6.022 × 10²³ of an entity. For example, 1 mole of Magnesium metals contains 6.022 × 10²³ atoms.
Mole is given as,
Moles = Mass / M.Mass
This equation shows that when the mass of a substance is given then one can calculate its moles by dividing its mass by M.Mass or Atomic Mass.
As we know the M.Mass of CO₂ is 44.01 g/mol therefore, the moles are calculated as,
Moles = 250 g / 44.01 g/mol
Moles = 5.68 mol of CO₂
Drinking after running on a hot day replaces water lost through
Answer:
Sweating
Explanation:
When you sweat, you lose water that your body needs to function.
Sweating because running in a hot day you can sweat 3-4 liters of fluid per hour
How many grams of O2 are required for the complete reaction of 45.0g of CH4 to form CO2 and H2O?
Answer: 90 g O2
Explanation: soution attached:
Balance first the chemical equation
CH4 + O2 => CO2 +2H2O
Convert mass of CH4 to moles
Use the mole ratio of CH4 and O2 from the balanced equation.
Convert moles of O2 to mass using the molar mass of O2.
why lead carbonate is not reacted with sulphuric acid in the formation of carbon dioxide
Answer:
Lead carbonate is not reacted with sulphuric acid in the formation of carbon dioxide because lead is insoluble in water. The reason is that lead is non polar substance and water is polar solvent means it makes positive and negative poles. Only polar solute dissolve in polar solvent and non polar solute dissolve in non polar solvent. So that's why lead carbonate do not dissolve in water and makes a layer on the water.
Explanation:
If one force on an object on an object is 5N upward and the other obect is 10N downward, what is the object's motion ?
Answer: It will move down
Explanation: Since there is an unbalanced force on the object its motion is directed on the side with the greatest amount of force.
Final answer:
With a net force of 5N downward, the object will accelerate downward.
Explanation:
If one force on an object is exerted 5N upward and another force is 10N downward, we can calculate the net force to determine the object's motion. By subtracting the upward force from the downward force, we get a net force of 10N - 5N = 5N downward. Since the net force is downward, the object will accelerate in the downward direction according to Newton's Second Law of Motion, assuming no other forces are acting on the object.
Drag the tiles to the correct boxes to complete the pairs.
Chromium is a transition metal, and oxygen has an oxidation number of -2. Use this information to match each compound to its chemical
formula.
chromium(VI) oxide
chromium(IV) oxide
chromium(IIl) oxide
chromium(ll) oxide
CrO-
CrO2-
CrO3-
Cr2O3-
EXPLAIN WHY THE AIR PRESSURE ON THE BEACH IN HAWAILIS
GREATER THAN THE PRESSURE ON TOP OF MAUNA KEA. (A
VOLCANIC PEAK)
The air pressure on the beach in Hawaii is greater than on top of Mauna Kea due to the greater altitude of Mauna Kea, which has less atmospheric mass above it exerting force. The atmospheric pressure is more substantial at sea level, where the complete atmosphere is overhead. Despite the large force exerted by air pressure when sunbathing on the beach, equal pressure inside the body allows one to easily stand up.
The air pressure on the beach in Hawaii is greater than the pressure on top of Mauna Kea due to differences in altitude. Atmospheric pressure decreases with altitude because the density of air molecules decreases as you go higher in the atmosphere; there are fewer air molecules above a given area exerting less force. At sea level, the pressure is at its highest because the full column of the atmosphere is above that point. In contrast, at the peak of Mauna Kea, which is 4.2 kilometers high, the column of air above it is significantly shorter, resulting in a lower pressure.
When lying on the beach sunbathing, the large force of atmospheric pressure, which is roughly equal to 10 tons, is exerted over the entire surface area of your body. However, because this pressure is exerted uniformly in all directions, your body's internal pressure, which is adjusted to the external atmospheric pressure, allows you to stand up without being crushed.
As a technician in a large pharmaceutical research firm, you need to produce 300. mL of 1.00 M a phosphate buffer solution of pH = 7.36. The pKa of H2PO4− is 7.21. You have 2.00 L of 1.00 M KH2PO4 solution and 1.50 L of 1.00 M K2HPO4 solution, as well as a carboy of pure distilled H2O. How much 1.00 M KH2PO4 will you need to make this solution?
Answer: pH = 7.36. The pKa of H2PO4− is 7.21.
Explanation:
New technologies have allowed buildings to become taller and heavier than ever before.This is an example of:
This is an example of "Skyscrapers".
Explanation:
Skyscraper is a high rise, tall multi storied building of that consist of about 40 floors inside it that is mainly built for the corporate offices, commercial spaces and residential flats.Buildings that are higher than 150m height are known skyscrapers. They have steel or iron framework to its inner side of the building that supports its floor and walls.Skyscrapers are made possible by the process of Bessemer process of mass production of steel beam.Answer:
its sum about the engernier proces
Explanation:
just did i on apex
!!!Help ASAP!!!What characterizes a system at equilibrium?
A. The system cannot undergo change.
B. The system has stopped changing.
C. The system is changing at an even rate.
D. There is no net change to the system.
Answer: Option D. There is no net change to the system.
Explanation:
What happens when an acid dissolves?
A. Oxygen is added to the solution.
B. It is no longer an acid,
C. Hydrogen gas is released,
D. H increases in solution.
Answer:
The answer is D. H+ increases in solution.
Explanation:
One water molecule gains a hydrogen and therefore takes on a positive charge, while the other water molecule loses a hydrogen atom and therefore becomes negatively charged.
More information:
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How many calories of heat are necessary to raise the temperature of 319.5 g of water from 35.7 °C
to the boiling point?
Answer:
20600 Calories
Explanation:
the pressure on a gas at -73° C is doubled but its volume is held constant. what will the final temperature in degrees be?
Answer:
127.15 °C
Explanation:
Gay-Lussac's law states that the pressure of a given mass of gas directly proportional to the absolute temperature of the gas at constant volume.
Mathematically,
P₁ / T₁ = P₂ / T₂ -----(1)
Data Given:
Initial Pressure = P₁ = 1 atm (assumed)
Initial Temperature = T₁ = -73°C = 200.15 K
Final Pressure = P₂ = 2 atm (doubled)
Final Temperature = T₂ = ????
Solving equation 1 for T₂,
T₂ = P₂ × T₁ / P₁
Putting these values;
T₂ = 2 atm × 200.15 K / 1 atm
T₂ = 400.3 K
Or,
T₂ = 127.15 °C
Conclusion:
By doubling the pressure results in increase in temperature.
The final temperature of the gas, when its pressure is doubled and volume held constant, increases from -73°C to 127°C.
To determine the final temperature of a gas when its pressure is doubled and volume remains constant, we use the Ideal Gas Law which can be expressed as PV = nRT.
When volume is held constant, the relationship between pressure and temperature is direct, i.e., P₁/T₁ = P₂/T₂Given the initial temperature (T1) is -73°C, which converts to 200 K (273 - 73), and the initial pressure (P1) is doubled to P₂= 2P₁, the formula becomes:
P₁ / 200 K = (2P₁) / T₂To find T₂ isolate T₂:
T₂ = 2 * 200 KT₂ = 400 KThus, the final temperature of the gas in degrees Kelvin is 400 K.
To convert back to degrees Celsius, subtract 273:
400 K - 273 = 127°CThe final temperature of the gas is 127°C.
A
0.510
m
aqueous solution of
KBr
has a total mass of
67.0
g.
What masses of solute and solvent are present?
Answer:
Molality of the solution : 0.630 M
Mass of the KBr (solute) = x grams
Mass of the solvents : 86.0 - x grams
Mass of the solute = 6.001 grams
Mass of the solvent = 86.0 - x grams = 86.0 - 6.001 g = 79.999 grams
Explanation:
A 0.510m aqueous solution of KBr has a total mass of 67.0g. The masses of solute and solvent are 3.833g and 63.167 g.
What is the difference between solute and solvent?The two main elements of a solution are a solute and a solvent. The solute is a substance that dissolves. The former dissolves in the solvent, which has that property. In other terms, the solvent is the dissolving media, and the solute is the stuff that is dissolved.
The solute, which is present in a solution in a smaller quantity than the solvent, is the substance that dissolves in the solvent. The term "solvent" refers to the substance that dissolves the solute in a solution; it is more abundant than the solvent.
Greater than the solvent is the boiling point. That is less than the solute's level.
Solute as a solid, liquid, or gas. Solvent is primarily liquid, but it can also be gaseous.
The qualities of the solute determine its solubility. The solvent's characteristics affect how something dissolves.
let the mass of solute be x g
mass of solvent= (67- x) g
Molality = [tex]\frac{x X 1000}{119(67-x)}[/tex]
solving for x:
x = 3.833g
67 - x = 63.167 g
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If a 2 liter container with an initial pressure of 2 atms is crushed to half its original volume what would its new pressure be in kPa’s
The final pressure will be 405.3 kilopascals.
Explanation:According to the Boyle's Law, the pressure of the gas is inversely proportional to the volume of the gas as the temperature of the gas remains constant.
So,PV = Constant.
Here in this question, the volume of the container is halved.
Let the Pressure of the gas initially be P1 and final pressure be P2. Volume of gas initially be V
So, according to Boyle's Law,
P₁V₁ = P₂V₂PP.
So, [tex]2 \times V[/tex] = P₂[tex]\frac V2[/tex].
So, P2 = 4 atm.
1atm = 101.325 kilo pascals.
So, 4 atm = [tex]4\times101.325[/tex] kilopascals. = 405.3 kilopascals.
Select the correct answer. What is heat of vaporization? A. It is the heat required to change a substance’s temperature by 1°C. B. It is the heat required to change a gram of substance from a solid to a liquid. C. It is the heat required to change a substance from a solid directly to a gas. D. It is the heat required to change a gram of substance from a liquid to a gas. E. It is the heat required to separate one substance into two substances.
The correct option is D.
What is meant by the heat of vaporization?The heat of vaporization is defined as the amount of heat needed to turn 1g of a liquid into a vapor, without a rise in the temperature of the liquid.
What is the heat of vaporization of water?That is, water has a high heat of vaporization, the amount of energy needed to change one gram of a liquid substance to gas at a constant temperature. Water's heat of vaporization is around 540 cal/g at 100 °C, water's boiling point.
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Which sentence contains a dependent clause?
A. Would you like to see the Washington Monument or the White House?
B. For spring break, my family will visit Washington, D.C., which is the capital of the United States.
C. The cherry blossom trees in Washington, D.C. are beautiful, so people like to have picnics in the park.
D. The Lincoln Memorial was built in 1922, and it’s one of the most popular monuments in Washington, D.C.
Answer:
B
Explanation:
4. which answer below is the formula mass of a water molecule?
a. 18.02 amu
b. 18.02 moles
c. 18.02 grams
d. 6.02 x 102 molecules
Use the table to determine the charge of phosphate in K3PO4.
Answer:
Charge on Phosphate is -3 (PO₄³⁻)
Explanation:
Ions or polyatomic ions are formed when an atom or molecule loses or gains electron(s) respectively.
Example:
Formation of ions.
Na → Na⁺ + e⁻ (Na loses one electron)
Cl₂ + 2 e⁻ → 2 Cl⁻ (Cl gains electron)
In polyatomic ions a charge is present on a molecule which has either two or more atoms.
Example:
CO₃²⁻ , SO₄⁻ , NH₄⁺ e.t.c.
In statement the K₃PO₄ polyatomic ionic compound. It is made up of three K⁺ ions and one Phosphate ion (PO₄ˣ⁻) ion.
As we know K belongs to group 1 metals so it has one valence electron and thus, forms a cation of +1 charge. So, for a neutral polyatomic ionic compound the overall charge on K₃PO₄ should be zero. Hence,
K (3) + PO₄ (X) = 0
Or,
+3 + X = 0
Or,
X = 0 - 3
X = -3
Therefore, the charge on phosphate is -3.
The charge of phosphate in K3PO4 is -3.
Explanation:The charge of phosphate in K3PO4 can be determined using the table provided. From the table, we can see that K+ has a charge of +1. Since there are three K+ ions in K3PO4, their total charge is +3. So, the charge of phosphate in K3PO4 is -3.
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