4.5g of mass of mercury contains the same number of atoms as 90.15g of helium.
What is mercury?With the atomic number 80 and the symbol Hg, mercury is a chemical element. Formerly known as hydrargyrum, which is a combination of the Greek terms hydor (water) and argyros), it is also known as quicksilver (silver). The only other element that is known to be liquid under these conditions is the halogen bromine, however metals like caesium, gallium, and rubidium melt just above ambient temperature. Mercury is a heavy, silvery d-block element.
All around the world, deposits of mercury, primarily in the form of cinnabar, are found (mercuric sulfide). Cinnabar, either natural or manufactured mercuric sulfide, is ground to create the crimson pigment vermilion.
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Which statement about electrons is false? * O They are negatively charged O They are insignificant in mass O They are involved in the formation of bonds O They are found in the nucleus of an atom
The rate at which a certain drug is eliminated by the body follows first-order kinetics, with a half life of 78 minutes.
Suppose in a particular patient the concentration of this drug in the bloodstream immediately after injection is 1.1 ug/mL. What will the concentration be 156 minutes later?
The concentration will be 156 minutes later when the rate at which a certain drug is eliminated by the body follows first-order kinetics, with a half life of 78 minutes is 0.275 ug/mL
Half life: It is known as the time needed to minimize the initial concentration to half. It is denoted by the symbol t1/2
For a first order reaction,
t1/2=0.693/k1
The half-life time for a first order reaction is unaffected by the substrate's starting concentration.
Half life of the given drug is 78 min
Total time is 156 min
Number of half lives corresponding to 156 min is 156/78=2
Therefore, the concentration of drug reduced in 156 min =2^2=4 times
Therefore, the number of half-life is present in the given total time is determined by dividing the total time with half-life of the drug.
The initial concentration is 1.1 ug/mL
Final concentration is 1.1/4=0.275 ug/mL
The concentration of drug after 156 min is 0.275 ug/mL
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Each dot represents an atom. Different colors represent different types of atoms. Match the picture with the correct type of substance it
represents.
column A
1.___ A
2.___ B
3.___C
4.___D
5.___E
6.___F
column B
a. mixture
b. element
c. compound
Fill in the name and empirical formula of each ionic compound that could be formed from the ions in this table:
The empirical formula of the given ions and name of their compounds are given below:
Empirical formula : CoPO₄; Name : Cobalt (iii) phosphateEmpirical formula : FeCrO₄ ; Name : Iron (ii) tetraoxochromate (vi)Empirical formula : Cu(OH)₂ ; Name : Copper (ii) hydroxideWhat is empirical formula?Empirical formula is the simplest formula of a compound where the elements in the compounds are shown in their simplest combining ratios.
The empirical formula of some compound are equal to the molecular formula of the compound whereas in some other, compounds, the empirical formulas are multiples of the molecular formula.
The empirical formula of the given ions and name of their compounds are given below:
Cation: Co³⁺; Anion; PO³⁻ ; Empirical formula : CoPO₄; Name : Cobalt (iii) phosphate
Cation: Fe²⁺ Anion; CrO₄²⁻ Empirical formula : FeCrO₄ ; Name : Iron (ii) tetraoxochromate (vi)
Cation: Cu²⁺ Anion; OH⁻ Empirical formula : Cu(OH)₂ ; Name : Copper (ii) hydroxide
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1.) The severity of a tropical storm is related to the depressed atmospheric pressure at its center. In August 1985, Typhoon Odessa in the Pacific Ocean featured maximum winds of about 90 mi/hr and pressure that was 40.0 mbar lower at the center than normal atmospheric pressure. In contrast, the central pressure of Hurricane Andrew (pictured) was 90.0 mbar lower than its surroundings when it hit south Florida with winds as high as 165 mi/hr.
If a small weather balloon with a volume of 50.0 L at a pressure of 1.00 atmosphere was deployed at the edge of Typhoon Odessa, what was the volume of the balloon when it reached the center?
2.) A balloon is filled to a volume of 12.5L at a temperature of 27.1ºC. If the pressure in the balloon is measured to be 2.20 atm, how many moles of gas are contained inside the balloon?
The severity of a tropical storm is related to the depressed atmospheric pressure at its center, then the volume of the balloon is 4.164 L.
What is pressure?Pressure is defined as the force applied perpendicular to the surface of an object per unit area over which the force is distributed.
Volume is defined as the space occupied by the boundary of the object in 3D space.
For ideal gas the equation is P1V1 = P2V2
The pressure of center of Odessa storm is
P(in) = P(atm) - 40mbar = 1.0325 - 40.0 x 10⁻³bar = 0.97325 bar
On applying ideal gas equation
P(in)V(in) = P(out)V(out)
V(in) = P(out)V(out) / P(in)
= 1.01325 bar x 40.0 L / 0.97325
= 4.164 L.
Thus, the severity of a tropical storm is related to the depressed atmospheric pressure at its center, then the volume of the balloon is 4.164 L.
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CAN SOMEONE PLS HELP ME ASAPPP FOR BRAINLEST PLSS
Answer:
Observation and recording
Explanation:
She was observing the rainfall for a year, and recorded the events everyday to analyze
PLEASE HURRY BEING TIMED! During which phase of the moon do meal tides occur?
Answer:They occur when the Earth, the Sun, and the Moon are in a line. The gravitational forces of the Moon and the Sun both contribute to the tides.Spring tides occur during the full moon and the new moon. During the moon's quarter phases the sun and moon work at right angles, causing the bulges to cancel each other.
Neap tides occur during the first and third quarter moon, when the moon appears "half full." NOAA's tide and tidal current predictions take into account astronomical considerations due to the position of the moon and the sun.
Explanation:
If your front lawn is 18.0 feet wide and 20.0 feet long, and each square foot of lawn accumulates 1450 new snowflakes every
minute, how much snow, in kilograms, accumulates on your lawn per hour? Assume an average snowflake has a mass of
1.60 mg.
The mass of the snow flakes that accumulates in one hour is 15552 Kg.
What is the mass of the snowflakes?We know that area is the product of the length and the breadth of the lawn. We have to first obtain the area of the lawn as;
Length = 20.0 feet
Width = 18.0 feet
Area = 20.0 feet * 18.0 feet = 360 square feet
If 1 square feet accumulates 450 new snowflakes every minute
360 square feet accumulates 360 square feet * 450 new snowflakes every minute/ 1 square feet
= 162000 new snowflakes every minute
If 162000 new snowflakes accumulates in one minute
x snow flakes accumulates in 60 minutes
x = 9720000new snowflakes
If 1 snow flake has a mass of 1.60 mg
9720000 new snowflakes has a mass of 9720000 snowflakes * 1.60mg/ 1 snow flake
= 15552000 mg or 15552 Kg
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Flawless diamonds and emeralds are colorless. A diamond is composed entirely of carbon, while an
emerald is made of beryl, a mineral with the chemical formula Bez Al2(SiO3) 6.
Which of the following
statements is chemically correct?
OA. Only a diamond is a compound.
OB. Only an emerald is a compound.
O C. Both gemstones are compounds.
OD. Neither gemstone is a compound.
The beryl species includes such well-known gemstones as aquamarines, emeralds, and morganites.
What is gemstones ?Gemstones are synthetic mineral crystals that have been cut and polished for use in jewelry or other adornments. It is also referred to as a superb gem, jewel, expensive stone, and semiprecious stone.
But even though they are not minerals, other rocks like lapis lazuli, opal, and obsidian, as well as occasionally biological materials like amber, jet, and pearl, are regularly used to make jewelry and are frequently regarded as gemstones.
Although soft minerals are more uncommon than hard gemstones, some of them are utilized in jewelry because of their brilliance or other aesthetically pleasing physical properties. Another quality that raises the value of diamonds is rarity. Another factor is reputation.
Along with jewelry, the two main categories of luxury art in early antiquity were hardstone sculptures and engraved jewels.
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Ba→Ba2+ what is the electron charge
The electron charge on barium is +2
Hence electron charge is +2.
Barium (Ba) has a +2 electron charge, that is barium has a positive charge of two.
Barium ion gets +2 charge by losing two electrons from its valence shell and becomes a positively charged ion called a cation. Also, barium is placed in group 2 of the periodic table, therefore has 2 electrons in its valence shell.
It is easier to lose these two outer shell electrons to become an ion than to gain six electrons to attain a stable configuration.
As barium is placed in group 2, it has two electrons, therefore in the given reaction Ba → Ba²⁺, barium when changing to barium ion has a +2 charge.
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What are the products formed when an acid reacts with a metal carbonate?
Answer:
Carbon dioxide gasMetal saltWaterExplanation:
[tex]{ \rm{MCO_{3(s)} + HX _{(aq)} \: \rightarrow \: MX_{(s)} + CO _{2(g)} + H _{2}O _{(l)} }}[/tex]
- MCO_3; Can be any metal carbonate such as Magnesium carbonate, Aluminum carbonate.....
- HX; can be any acid such as sulphuric acid, hydrochloric acid, nitric acid.....
- MX; is a metal acidic salt such as magnesium sulphate from magnesium carbonate and sulphuric acid, Aluminum chloride from Aluminum carbonate and hydrochloric acid.
Convert 23.4
kJ to calories
PLEASE SHOW WORK SO I CAN LEARN
On converting 23.4 kilojoules of energy into calories we get 5.6 calories of energy.
We have energy in kilojoules.
We have to convert it into calories.
What is the relation between 1 kilojoules and 1 calorie ?In 1 kilojoules there are 0.239 calories.
According to the question -
Energy in kilojoules = 23.4 kJ
In order to find the equivalent energy in calories, multiply 23.4 by 0.239 -
23.4 x 0.239 = 5.6 calories.
Hence, in 23.4 KJ there are 5.6 calories.
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Why do the water molecules change between states?
Answer: As the water molecules gain energy, they can escape from the attractions of their neighbors and change into a more fluid state.
Explanation: have a wonderul day !
calculate basicity of H3PO4
H₃PO₄ is a Phosphoric acid and its Basicity is 3.
The basicity of a molecule is determined by the number of acidic hydrogen atoms present. The quantity of acidic hydrogen atoms in a substance is what determines its basicity.
To become acidic, a hydrogen atom must establish a very strong electronegative bond with an oxygen or fluorine atom. H₃PO₄ is acidic because the hydrogen atoms are bonded to or united to three oxygen atoms as a result. H₃PO₄ thus has a basicity of 3. Due to the fact that H₃PO₄ has a basicity value of 3, it is a tribasic acid. The ability of a base to replace a number of hydrogen atoms in a certain acid is known as the basicity process. In H₃PO₄, there are three atoms therefore, the basicity is 3.
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Students are working to find the mass of a hand lens which of the following would students use the measure mass
You may use a hand-lens to help you make this measurement. A student investigates the vertical oscillations of the mass–spring system.
How does the mass-spring system work?Depending on the point of view and the unit of time, velocity is the rate at which the direction of an object in motion changes over time. Velocity is a key concept in kinematics, the branch of classical mechanics that analyzes how bodies move.
The physical vector quantity known as velocity's magnitude and direction must be determined. The scalar absolute value (magnitude) of velocity is speed, a coherently derived unit whose quantity is measured in meters per second in the SI (metric system). In contrast to "5 meters per second east," which is a vector, "5 meters per second" is a scalar.
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At what temperature would 4.62 g of KCl begin to crystallize in 10 mL of water?
Answer:
7° it's that cause the crylatise
The temperature at which 4.62 g of KCl begins to crystallize in 10 mL of water is 62° Celsius.
What is temperature?Temperature is the measurement of the hotness or coldness of the body. It is denoted by Kelvin.
Given, m=4.62 g of KCl, V= 10 ml of water
ro = 1 g/ml for water, so m(water)
V x ro = 10ml x 1(g/ml) = 10 g.
Solubility (for water as solvent) is defined as grams of solute dissolved per 100g of water.
So solubility for this case = m(KCl)/m(water) =
4.62g of KCl/10g of water = 46.2 g of KCl/100 g of water.
According to the graph below, KCl's solubility reached 46.2 g/100 g at a temperature of about 62 degrees Celsius.
KCl/10 g of water or 46.2 g of KCl/100 g of water.
Therefore, cooling the solution is necessary for crystallization. Crystallization will occur in this situation as soon as the temperature falls below 62 degrees Celsius (about).
The ultimate conclusion is that this KCl solution in water will begin to crystallize at 62 degrees Celsius (about).
Therefore, the temperature is 62° Celsius.
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Why does the melting of the polar ice caps facilitate the absorption of CO2 by ocean waters?
hi brainly user! ૮₍ ˃ ⤙ ˂ ₎ა
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Answer:
The melting of the caps increases the concentration of CO2 in the water, making its absorption faster.
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Explanation:
CO2 absorptionThe polar caps of our planet have in their composition several elements, among them the CO2 that is absorbed by the atmosphere. Cold waters, which are present in the Arctic, have an easier time absorbing CO2 compared to other waters.
When glaciers melt, the CO2 that is present in the mixture is dissolved in the ocean, increasing its concentration. The cold waters that came from the ice caps increase the absorption of CO2.
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HELP QUICK PLEASE TEST TIMED HUNDRED POINTS Which of the following is NOT one of the basic points of Cell Theory? THE CELL THEORY O All living things are made of cells. The cell is the smallest living thing that can perform all the functions of life. O Cells are too small to see without a microscope. O All cells must come from pre-existing cells. O Other:
Answer:
Cell are too small to see without a micrscope
Explanation:
Cuz I learned in school
The following which is not one of the basic points of Cell Theory is cells are too small to see without a microscope. Hence option c is correct.
What is microscope?Microscope is defined as a lab tool for inspecting things that are too small to be seen with the eye. The study of small objects and structures under a microscope is known as microscopy. Being microscopic means being difficult to see without a microscope. A specimen that has been placed on a slide is seen, magnified, and imaged using the microscope's optical components.
Cell theory is defined as a cells are believed to be the primary building blocks of all living tissues according to a basic biological scientific hypothesis. The essential unit of structure and function in living things is the cell, according to the current Cell Theory, which is widely recognized. One or more cells make up every living thing. Cellular division creates new cells from existing ones.
Thus, the following which is not one of the basic points of Cell Theory is cells are too small to see without a microscope. Hence option c is correct.
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2. The owner of a necklace claims that it is made of pure gold (density = 19.2 g/cm³).
The necklace has a mass of 19.21 g. When the necklace is placed in a graduated
cylinder that initially contained 20.8 mL of water, the level rose to 22.0mL?
Find the density of necklaces
Is the necklace made of pure gold?explain
Gold has a density of 19.2 gm/cm.
The necklace weighs 19.21 g.
Water was initially present in 20.8 ml.
22 ml is the total amount of water.
Due to its great density, which results from the fact that each of gold's atoms is individually highly heavy, gold is referred to as a heavy metal.
(a) The necklace's volume is 22 - 20.8 ml.
- The density of a necklace is determined by its mass and volume.
The necklace's density is 19.21 divided by 1.2.
Necklace has a density of 16 gm/ml.
(b) The necklace is constructed of alloy rather than pure gold.
This is due to the necklace's varied density from that of pure gold.
It follows that the necklace contains something else in addition to the gold.
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Which is the correct formula for copper(II) phosphate?
Answer:
Cu3(PO4)2
ExplanatiIn Act III of Romeo and Juliet, what does Friar Lawrence mean when he says, "O, then I see that madmen have no ears."
A. Angry people will not listen to reason.
B. Ears refers to ears of corn. Those who are hungry and without food go crazy.
C. Crazy people tend to cut off their own ears.
D. Romeo is being unreasonable and will not listen to him.
Answer:
D
Explanation:
most reasonable answer
The correct interpretation of Friar Lawrence's statement in Act III of Romeo and Juliet is: A. Angry people will not listen to reason.
In this scene, Friar Lawrence is expressing his frustration and realization that rational arguments and advice are ineffective when dealing with people who are consumed by anger or driven by their emotions. He sees that Romeo, who is filled with grief and rage after being banished, is not receptive to his reasoning and is acting impulsively.
The line suggests that when people are in a state of madness or extreme emotional turmoil, they become deaf to rational counsel and are unlikely to heed any advice or guidance.
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Which element, Oxygen (O) or Fluorine (F), has a smaller atomic radius?
O, because the attraction between protons and valence electrons is weaker.
F, because the attraction between protons and valence electrons is stronger.
F, because the attraction between protons and valence electrons is weaker.
O, because the attraction between protons and valence electrons is stronger.
Fluorine has a smaller ionic radius than oxygen, because the attraction between protons and valence electrons is stronger; option B
What is ionic radius?Ionic radius is the radius of an ion of an element given by the distance from the nucleus up to where the nucleus has an influence on the ion's electron cloud.
The ionic radius of ions of elements depends on;
the nuclear charge, electron shielding,the number of electron shells as well as the number of electrons in the outermost shell of of an ion of an element.The greater the nuclear charge, the smaller the ionic radius.
The greater the electron shielding effect, the greater the ionic radius.
For non-metallic ions just as in metallic ions, the ionic radius decreases from left to right across the period table as a result of the increase in the nuclear charge of the ions.
Also, the ionic radius of nonmetals increase on going down the same group in the periodic table due to to increase in electron shielding as well as addition of an extra electron shell.
Therefore, the ionic radius of fluorine will be smaller than that of oxygen because of a greater nuclear charge.
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Convert the height of Mt. Kilimanjaro, at 19,565 ft, to kilometers
given the following equivalence:
1 m = 3.28084 ft
Do 19565 ft × 3.28084 ft ...than
answer will come in meter than convert it into kilo meter
The epinephrine hormone is released in the human body during stress and increases the metabolic ratio of the body, its percentage composition is C= 59.00%; H= 7.15%; N= 7.65% and O= 26.20%. What is the simplest formula for epinephrine?
The epinephrine hormone is released in the human body during stress and increases the metabolic ratio of the body. The simplest molecular formula for epinephrine is C₉H₁₃NO₃.
What are epinephrine?Epinephrine is also known as adrenaline, it is both the hormone and neurotransmitter.
As a hormone, its made and released by your adrenal gland.
As a neurotransmitter, its a chemical messenger that helps transmit nerve signal across the nerve endings to another nerve cell.
Epinephrine is also called as catecholamines, as a norepinephrine and dopamine.
Formula - C₉H₁₃NO₃
Molar mass - 183.204 g/mole
As a neurotransmitter epinephrine plays a small role, small amount is produced in your nerves.
The major role of epinephrine is in hormones. It releases by your adrenal glands in response to stress. This reaction causes a number of change in body and is known as a fight -or- flight response.
Thus, epinephrine hormone is released in the human body during stress and increases the metabolic ratio of the body. The simplest molecular formula for epinephrine is C₉H₁₃NO₃.
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Which sample will have the greatest mass?
Question 3 options:
a)2 mol NO
b) 2 mol NO2
c) 3 mol NO
d) 3 mol NO2
Answer:
C
Explanation:
C is the right answer for this question.
Put these in order from least amount of inertia to greatest amount of inertia.
A Toy Car
A Bicycle
A jet airplane
A Truck
Jalen's aunt is a meteorologist. She explains to him that, in order to understand the weather, it is important to understand how water moves from the surface of Earth to the atmosphere. If Jalen wants to learn more about the process that moves water in this way, what should he study?
Answer:
Studies have revealed that evaporation—the process by which water changes from a liquid to a gas—from oceans, seas, and other bodies of water (lakes, rivers, streams) provides nearly 90% of the moisture in our atmosphere. Most of the remaining 10% found in the atmosphere is released by plants through transpiration.
Explanation:
You measure a rectangular solid and find it to be 9.14 cm long, 3.82 cm wide, and 5.63 cm high. The mass
of the solid is 74.319g. Determine the density of the solid
The density of the rectangular solid is 0.378 g/ [tex]cm^3}[/tex] .
Density of rectangular solid is calculated by ratio of mass by volume of the of rectangular solid .
Density = mass / volume
mass = 74.319 g ( given )
length of the rectangular solid = 9.14 cm
wide of the rectangular solid = 3.82 cm
height of the rectangular solid = 5.63 cm
volume = length × width × height = 9.14 cm × 3.82 cm × 5.63 cm
volume = 196.57 [tex]cm^3}[/tex]
putting the value of mass and volume in equation ( i ) we get ,
Density = mass / volume
Density = 74.319 g / 196.57 [tex]cm^3}[/tex] = 0.378 g/ [tex]cm^3}[/tex]
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PLEASEE HELPPPPP
the law of conservation of mass states that mass cannot be created nor destroyed. Explain what this means and provide an example. Use details to support your answer.
What is meant that mass cannot be created nor destroyed in the law of conservation of mass is that, matter can take part in a chemical reaction, but the initial mass of the matter (reactants) will be equal to the final mass of the matter (products formed).
What is law of conservation of mass?
The law of conservation of mass states that the mass can neither be created nor destroyed but it can be transformed from one form to another.
Examples of law of conservation of mass;
when firewood burns, the mass of the soot, ashes, and gases equals the original mass of the charcoal and the oxygen when it first reacted.So, in the law of conservation of mass, the sum of the masses of the reactants in a chemical reaction and products formed in the process remains unchanged.
Thus, what is meant that mass cannot be created nor destroyed in the law of conservation of mass is that, matter can take part in a chemical reaction, but the initial mass of the matter (reactants) will be equal to the final mass of the matter (products formed).
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Answer:
The law of conservation of mass states that the mass can neither be created nor destroyed but it can be transformed from one form to another.
Explanation:
which of the following gives the best description of the speed
Answer:
40 km in a hour?
Explanation: