Answer:
Untreated water from rivers, lakes, ponds, springs, or streams is likely to contain unsafe levels of infectious microorganisms, and drinking it may cause illness.
Explanation:
Name the compound O2Cl6
Answer:
dioxide hexachloride
How does the activity series of metals reflect the stability of metals?
A. The metals lowest on the list are the least stable.
B. The metals highest on the list are the most stable.
C. The metals lowest on the list are the most reactive.
D. The metals highest on the list are the least stable.
The activity series of metals reflect the stability of metals are "the metals highest on the list are the least stable."
What is activity series?The organization of metals in a declining sequence of respective reactivities is referred to as the "activity series," also described as the "reactivity series" of metals.
What is metals?Materials having the qualities of being bright, hard, fusible, malleable, ductile, etc. were known as metals.
The activity series of metals reflect the stability of metals are "the metals highest on the list are the least stable."
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Calculate the concentration of hydrogen ion of a sample of vinegar with pH 6.82
The concentration of hydrogen ion of a sample of vinegar : 1.514 x 10⁻⁷
Further explanationpH is the degree of acidity of a solution that depends on the concentration of H⁺ ions. The greater the value the more acidic the solution and the smaller the pH.
So that the two quantities between pH and [H⁺] are inversely proportional because they are associated with negative values.
A solution whose value is different by n has a difference in the concentration of H⁺ ion of 10ⁿ.
pH = - log [H⁺]
pH of a sample vinegar = 6.82
The concentration of hydrogen ion :
[tex]\tt 6.82=-log[H^+]\\\\(H^+]=10^{-6.82}=1.514\times 10^{-7}[/tex]
ca2 -calmodulin-dependent facilitation and ca2 inactivation of ca2 release-activated ca2 channels
This article aims to find that [tex]Ca^{2+}[/tex] occupancy of a site on the extracellular side of the CRAC channel ordinarily potentiates its [tex]Ca^{2+}[/tex] as well as [tex]Na^{+}[/tex] currents, and [tex]Ca^{2+}[/tex] dissociation from this site is responsible for the inactivation of its [tex]Na^{+}[/tex] current.
The most extensively studied of the store-operated ion channels, which are widely expressed and crucial to many vital biological processes, is the [tex]Ca^{2+}[/tex] release-activated [tex]Ca^{2+}[/tex] (CRAC) channel. But little is known about the CRAC channel's molecular makeup or how intracellular or extracellular messengers control it.
It becomes more permeable to monovalent cations with a higher current when extracellular divalent cations are absent, however this monovalent cation current quickly deactivates due to an unidentified mechanism.
Here, it was found that [tex]Ca^{2+}[/tex] occupancy of a site on the extracellular side of the CRAC channel ordinarily potentiates both its [tex]Ca^{2+}[/tex] and [tex]Na^{+}[/tex] currents. [tex]Ca^{2+}[/tex] dissociation from this site, however, results in the inactivation of the channel's [tex]Na^{+}[/tex] current. This [tex]Ca^{2+}[/tex]-dependent potentiation is required for the normal functioning of CRAC channels.
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Which answer correctly identifies the five levels of cell organization from simple to most complex A-bone cell, bone tissue, femur, skeleton, dog B-dog, skeleton, femur, bone tissue, bone cell C-bone tissue, dog, bone cell, femur, skeleton
Answer:
A-bone cell, bone cell C-bone tissue, bone cell bone tissue, femur, skeleton, dog B-dog.
Explanation:
It is ordered from the smallest unit (tissue microstructure) to a tissue or organ that are considered macrotisular structures.
Put the steps below in the order they are performed in the lab experiment by numbering them 1-7. Use a Bunsen burner to heat and dry the hydrate, repeating until the mass no longer decreases. Measure the final masses of the crucible, cover, and anhydrous salt. Compute differences in masses to find the reactants and products. Measure initial masses of the crucible and cover, with and without the hydrate. Use the numbers of moles to compute the mole ratio. Use stoichiometry to convert these masses to moles. Use the mole ratio to write the hydrate’s formula.
Answer:
1) Measure initial masses of the crucible and cover with and without the hydrate.
2) Use a Bunsen burner to heat and dry the hydrate, repeating until the mass no longer decreases.
3) Measure the final masses of the crucible, cover, and anhydrous salt.
4) Compute differences in masses to find the reactants and products.
5) Use stoichiometry to convert these masses to moles.
6) Use the numbers of moles to compute the mole ratio.
7) Use the mole ratio to write the hydrate’s formula.
Explanation:
A hydrate is any substance that contains water of crystallization. The water of crystallization constitutes part of the mass of the substance. When heated to constant mass, the substance looses its water of crystallization and becomes anhydrous.
The mass of the anhydrous substance is now obtained by weighing again and subtracted from that of the hydrated substance. The masses are converted to moles using stoichiometry and the moles are then used to obtain the formula of the hydrate.
Answer: answers in order from top to bottom
2
3
4
1
6
5
7
Explanation: right on edg
what is the Transfer of energy from one object to another through direct contact?
Answer:]
Conduction is the transfer of energy from one molecule to another by direct contact. This transfer occurs when molecules hit against each other, similar to a game of pool where one moving ball strikes another, causing the second to move.
Explanation:
186km at 3:00 the speed limit is 65km/h
He will arrive at the second city on time
Using the formula for calculating speed expressed as:
Distance = Speed * time
Given the following parameters
Speed = 65km/hr
Time = 3 hours (from noon to 3PM)
Get the distance covered by Isaiah;
Distance = 65 * 3
Distance = 195km > 186km
Since the distance covered by Isaiah is greater than the distance from one city to another city, hence he will arrive at the second city on time
What is Speed?
The speed at which an object's location changes in any direction. The distance traveled in relation to the time it took to travel that distance is how speed is defined. Since speed simply has a direction and no magnitude, it is a scalar quantity.
Therefore,
186km at 3:00 the speed limit is 65km/h
He will arrive at the second city on time
Using the formula for calculating speed expressed as:
Distance = Speed * time
Given the following parameters
Speed = 65km/hr
Time = 3 hours (from noon to 3PM)
Get the distance covered by Isaiah;
Distance = 65 * 3
Distance = 195km > 186km
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What characteristic do atoms in the same group of elements share?
1 - they have the same number
2 - they have similar physical property
3 - they have the same atomic mass
4 - the same number of electrons orbitals
Answer:
2 option
Explanation:
please mark me brainliest and 5 star
You are on a road trip to San Francisco. You drove 200 miles in 3 hours, and then stopped for lunch for
30 minutes. After lunch, you traveled 150 miles in an hour and a half. What was your average speed
for this trip? SHOW YOUR WORK!
a. Calculate the average speed including the time spent for lunch.
b. Calculate the average speed without the lunch stop
Answer:
Explanation:
a)
Average speed is total distance over change in time.
So
total distance=(200+150)
=350
total time=(3+0.5+1.5)
=5
350 km/5 hours
70km/hour
Therefore:
70 km/h is the average speed
b)
total distance=(200+150)
=350
total time=(3+1.5)
=4.5
350/4.5
=approx. 77.77 km/hour
Therefore:
77.77/hour is the average speed
Don't know if you round but uh yeah
Heat depends on A. Atmospheric pressure B. Particle speed only C. Number of particles D. Both speed and amount
Which ranks the solutions from the strongest to weakest acid?
W X Y Z
Y W X Z
W X Z Y
Y Z X W
Answer:
the answer is the last option yzxw
Explanation:
ph is stronger the lower
Answer:
D: Y → Z → X → W
Explanation:
on edge2021! hope this helps!!~ ー( ´ ▽ ` )ﾉ
how many electrons does cobalt lose/donate?
Answer:
Cobalt lose 3 electrons and donate 12 electrons.
Explanation:
In the periodic table,cobalt has nine electrons .It has lost 3 electrons,so it is only six left.Once it forms the complex,each ammonia donates a pair of electrons.
What is incorrect in the structure? Check all that apply. The middle hydrogen is surrounded by 4 electrons. Oxygen is surrounded by 8 electrons. The middle hydrogen is bonded to 2 elements. There are too many electrons in the final structure.
Answer: The middle hydrogen is surrounded by 4 electrons, the middle hydrogen is bonded to 2 elements, and there are too many electrons in the final structure are correct.
Explanation: I just did this question and got the correct answers.
The incomplete points about the structure H—H-O: is that the middle hydrogen is surrounded by 4 electrons, the middle hydrogen is bonded to 2 elements, and there are too many electrons in the final structure are correct.
For better understanding let's explain the Lewis structure
Lewis Structure is simply showing or the representation of a molecule that tell use how the valence electrons are putt in place (arrange) among the atoms in the molecule.From the above we can therefore say that the answer The incomplete points about the structure H—H-O: is that the middle hydrogen is surrounded by 4 electrons, the middle hydrogen is bonded to 2 elements, and there are too many electrons in the final structure, is correct.
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The kinetic energy of an object can be determined using the equation , where is the kinetic energy, is the mass, and is the speed of the object. What is the mass of an object moving at a speed of 12 that has 36 J of kinetic energy?
Answer:
0.5kg
Explanation:
Given parameters:
Speed of the object = 12m/s
Kinetic energy = 36J
Unknown:
Mass of the object = ?
Solution:
Kinetic energy is the energy due to the motion of a body. It is mathematically expressed as;
K.E = [tex]\frac{1}{2}[/tex] m v²
Insert the parameters and solve;
36 = [tex]\frac{1}{2}[/tex] x m x 12²
36 = 72m
m = 0.5kg
What is the frequency of a 7.43e-5 m wave?
2.23e3 Hz
4.04e12 Hz
2.48e-13 Hz
None of the above
Answer:
None of the above!
Explanation:
Can someone explain a method to help convert different units of measurement to another? For example, centimeters to kiloliters? My teacher uses a chart method but it's a little confusing. Can anyone help?
Answer:
Compare your two units. The two units must measure the same thing.
For example, in the problem "convert 2 inches into centimeters," both inches and centimeters measure length. If your units measure two different things (like length and weight), you can't convert between them.
or
Look up the conversion. Before you can do the math, you need to know how much larger one unit is than the other.If the conversion you find has many decimal places, round to the nearest significant digit. If you don't know what a significant digit is, round to the second or third digit.
For example, if you need to convert 2 inches to centimeters, you need to know that 1 inch = 2.54 centimeters.
Explanation:
Hope this will help
please make my answer as brainelist
A museum wants to store their valuable documents in cases that contain a gas that will protect the documents. The museum director should choose
Choose... = chlorine gas, oxygen gas, a noble gas, a halogen.
She should not choose one of the other gases because they are too
Choose... = expensive, reactive, smelly, unreactive.
Answer:
A noble gas, reactive
Explanation:
I'm just too based
IF the strong nuclear force affects all particles that are close to each other, What will happen if we add two neutrons to our nucleus with two protons?
A) It will decrease the electromagnetic force in the nucleus
B) It will decrease the strong nuclear force in the nucleus
C) It will increase the strong nuclear force in the nucleus
D) It will increase the electromagnetic force in the nucleus
Answer: it will increase the strong nuclear force in the nucleus
Explanation: Labster
Answer : It will increase the strong nuclear force in the nucleus ( C )
Given that the strong nuclear force affects the particles that are close to each other addition of two neutrons and two protons, will cause an increase in the strong nuclear force found in the nucleus . this is because a Nucleus with two ( 2 ) protons exhibits attractive nuclear force and a repulsive coulomb force. and since the nuclear force does not depend on the charge, the addition of two neutrons the attractive nuclear force will increase
Hence we can conclude that addition of two neutrons to our nucleus with two protons will increase the strong nuclear force in the nucleus.
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The molecule H2O can be correctly described as a?
1) compound.
2) compound and a molecule.
3) molecule.
Determine the kinetic energy of a 1000-kg roller coaster car that is moving with a speed of 20.0 m/s.
Answer: 200000 J
Explanation:
Formula for kinetic energy: Ek=1/2 *mv^2
m=1000 kg. v=20.0m/s
Ek=1/2 *1000*20^2
Ek=500*400
Ek=200000 J
J=joules
A 25.0 mL sample of 0.100 M lactic acid (HC3H503, Ka = 1.4 E-4) is titrated with 0.100 M NaOH solution. Calculate the pH of the resulting
solution after 0.0ml of NaOH have been added
What do the superscripts in an electron configuration represent?
Answer: number of electron in respective sub shell or orbital
Explanation:
In an electron configuration, the superscripts (written as numbers above the orbital symbols) represent the number of electrons present in each orbital. They indicate the distribution of electrons among different energy levels and sublevels within an atom.
What are superscripts?Superscripts are characters or numbers that are positioned slightly above the normal line of text. They are typically smaller in size and are used to indicate various types of information or formatting in written text.
The superscripts are determined based on the rules of filling electron orbitals, such as the Pauli exclusion principle and Hund's rule. These rules govern the arrangement of electrons in the orbitals according to their energy levels and sublevels.
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Is the substance in the chart a metal or non metal? Explain.
Answer:
Nonmetal
Explanation:
A substance in the chart is a nonmetal because nonmetals are not water soluble, they are poor conductors of heat and electricity and they do not have high melting points like metals.
The speed of light in a vacuum is 2.998×10^8 m/s .
What is its speed in miles per minute (mi/min)?
Answer:299,800,000
Explain: The speed of light is 3.00x108m/s and in mph is 6.708 x 108.
A marble is given potential energy by being placed at Location W. When the marble released, it rolls down the track.
At which location does the marble have maximum kinetic energy?
A Location w
B Location X
C Location Y
D Location 2
Answer:the answer is c , location Y
The location at which the marble have maximum kinetic energy is location Y.
What is conservation of energy?Conservation of energy states that total energy of the system doen not change else the one form of energy is converted into another form within the system.
In the given diagram it is mention that potential energy of marble is highest at the location W as potential energy is directly proportional to the height. But when the marble rolls down it attains the kinetic energy and potential energy decreases.
According to the law of conservation at point Y potential energy is minimum, so that kinetic energy becomes maximum at this point.
Hence at location Y marble have maximum kinetic energy.
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Which of the following most likely requires intermolecular forces?
Answer: The intermolecular forces increase with increasing polarization of bonds. Boiling point increases with molecular weight, and with surface area. The three major types of intermolecular interactions are dipole–dipole interactions, London dispersion forces (these two are often referred to collectively as van der Waals forces), and hydrogen bonds. Intermolecular forces are much weaker than the intramolecular forces of attraction but are important because they determine the physical properties of molecules like their boiling point, melting point, density, and enthalpies of fusion and vaporization.In order from strongest to weakest, the intermolecular forces given in the answer choices are: ion-dipole, hydrogen bonding, dipole-dipole, and Van der Waals forces. Ionic bonding is stronger than any of the given intermolecular forces, but is itself NOT an intermolecular force.
Hope this helps.. Stay safe and have a Merry Christmas!!!!!!!!!! :D
Answer:
A
Explanation:
edge 2020
calculate the number of hydrogen atoms in a 90.0g sample of camphor c10h16o. be sure your answer has a unit symbol if necessary, and round it to 3 significant digits.
The number of hydrogen atoms in a 90.0g sample of camphor C₁₀H₁₆O is 5.68 X 10²⁴.
The mass of 1 mole of a chemical is indicated by its molar mass. It provides you with the amount of grams per mole of a substance, to put it another way.
Given,
Mass of sample of camphor (C₁₀H₁₆O), m = 90.0g
To find: No. of hydrogen atom in given sample.
Molecular mass of camphor is:
M = 152 g/mol
Moles of camphor,
n = m/M
n = 90/152 = 0.59
1 mole of camphor contains 16 moles of Hydrogen
so, 0.59 moles of camphor contains 9.44 moles of hydrogen
1 mole of any substance contain 6.022 X 10²³ no. of atoms/molecule
So, no. of atoms in 9.44 moles of hydrogen is
N = 6.022 X 10²³ X 9.44
N = 56.84 X 10²³
N = 5.68 X 10²⁴
Hence, The number of hydrogen atoms in a 90.0g sample of camphor C₁₀H₁₆O is 5.68 X 10²⁴.
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If two wave crests overlap each other and one has an amplitude of 5 and the other has an amplitude of 3, what is the interference that is created?
Answer:
The interference is 8
Explanation:
The energy that is associated with the temperature of an object is called?
Answer:
The thermal energy of an object is the energy contained in the motion and vibration of its molecules. Thermal energy is measured through temperature.