Answer:
c / a
correct me if im wrong
Answer:
D) 4 protons, 4 electrons, 5 neutrons
Countercurrent Flow
Which filter regions have a concentration gradient between the blood and dialysate?
Check all that apply.
Answer: All options (I, II, III, IV, V)
Explanation: The answer is all options because they never reach equilibrium or intersect at a region as the both decrease at the same rate.
Answer: Picture shows the correct one
Explanation:
What makes solids, liquids, and gases different. Explain the hypothesis, prediction and experiments that can lead to scientific theory.
Answer: Gases, Liquids, and Solids
Gases
Explanation:
Behavior
gas liquid solid
assumes the shape and volume of its container
particles can move past one another assumes the shape of the part of the container which it occupies
particles can move/slide past one another retains a fixed volume and shape
rigid - particles locked into place
compressible
lots of free space between particles not easily compressible
little free space between particles not easily compressible
little free space between particles
flows easily
particles can move past one another flows easily
particles can move/slide past one another does not flow easily
rigid - particles cannot move/slide past one another
a hypothesis is a prediction based on a theory. If the Hypothesis comes true the theory is more accepted.
A scientific theory differs from a scientific fact or scientific law in that a theory explains "why" or "how": a fact is a simple, basic observation, whereas a law is a statement (often a mathematical equation) about a relationship between facts.
Analyze the reaction of solid magnesium and water. Which pair of reactants and products in the table below represent the correct balanced equation for the reaction?
Answer:
monkey
Explanation:
cause that's what u r
If you were a scientist investigating the effects of antioxidants in foods, what would you test and why?
Answer:
One possible reason why many studies on antioxidant supplements do not show a health benefit is because antioxidants tend to work best in combination with other nutrients, plant chemicals, and even other antioxidants.
Explanation:
How many grams are in 3.4 moles of Lead (IV) Sulfate (Pb(SO4)2)? ) Molar mass: 303.26 g/mol 131.0840
Answer:
1031.084g
Explanation:
n=m/M
m=n(M)
m = (3.4mol)(303.26g/mol)
1031.084g
Hope that helps
Answer:
1031.08
Explanation:
You start with 3.4 moles and you know that 6.022 x 10 ^ 23 = 1 mole( Avogadro's Number), so you just multiply those 2 numbers and the moles will cancel leaving you with grams of Lead Sulfate.
What is chemistry,define it ?
Answer:
the branch of science that deals with the identification of the substances of which matter is composed; the investigation of their properties and the ways in which they interact, combine, and change; and the use of these processes to form new substances.
Explanation:
Hope this helps!
What is the mass of 1.25 x [tex]10^{24}[/tex] atoms of nitrogen?
Answer:
i dont know
Explanation:
trolololololololololololololololol
When a solution of cesium chloride (CsCl) is subjected to high-speed centrifugation, a stable density gradient is formed.
a. True
b. False
PLS ANSWER ALL QUESTIONS FOR 67 POINTS
Atomic Structure
1. All atoms are made up of small particles called ____________________.
2. These small particles include the positively charged ________________, the negatively charged _____________ and the neutral ____________.
3. The atomic mass equals the ______________ and the ______________.
4. The atomic number tells you the number of ________________ which is equal to the number of _________ in a stable atom.
5. So, we can use the atomic mass and the atomic number to calculate the total number of just the neutrons. Calculate the number of neutrons in a Carbon atom.
[Picture of carbon]
Total number of neutrons = ________________
6. The lightest sub-atomic particle is the _____________
7. The center of the atom is called the __________
8. The area where the negatively charged particles can be found is called the _________________
9. Each of the charged particles are on what we call ____________ or ______________
a. There are how many on the 1st layer _________
b. On the 2nd layer _________
c. On the 3rd layer _________
d. Electrons on the outer level of any atom have a special name which is _____________________ and these outer electrons determine the atoms reactivity with other elements
Explanation:
1. subatomic particles.
2.proton, electron and neutron
3.The atomic mass of an element is actually the sum of the MASSES of protons and neutrons in AN atom of that element
4.An element's atomic number is equal to the number of protons in the nuclei of any of its atoms
5. Number of Protons = Atomic Number
Number of Electrons = Number of Protons = Atomic Number
Number of Neutrons = Mass Number - Atomic Number
For krypton:
Number of Protons = Atomic Number = 36
Number of Electrons = Number of Protons = Atomic Number = 36
Number of Neutrons = Mass Number - Atomic Number = 84 - 36 = 48
6. electron, lightest stable subatomic particle known. It carries a negative charge of 1.602176634 × 10−19 coulomb, which is considered the basic unit of electric charge. The rest mass of the electron is 9.1093837015 × 10−31 kg
7.The center of the atom is called a nucleus
8. Negatively charged particles are found in multiple layers outside the nucleus of the atom. These particles are called electrons, and they orbit in various energy levels around the atom's nucleus.
9. A charged particle is also called an ion
how many kernels are in a bag of microwave popcorn?
HELLLPPPP ASAP !!!! Pls
Answer:
Melting point, boiling point, state of matter at room temperature, heat of vaporization, flammability and reactivity
Explanation:
What does a chemical equation show that a word equation does not
Answer: I do believe it shows variables.
Explanation:
2) Imagine that a loudspeaker is producing quiet note with a low pitch
How will it’s viberation change
a) If the pitch of the note becomes higher?
b) If the note become louder
Answer:
Higher pitched sounds produce waves which are closer together than for lower pitched sounds. (Think of the slinky - if you produce waves rapidly they will travel quite close to each other, thus demonstrating a higher pitched sound.)
The pitch of a note will depend on a number of factors. One of these is the size of the vibrating object. On a glockenspiel or xylophone the high notes are made by the smaller bars. A smaller triangle or cymbal will make a relatively higher pitch note. On a stringed instrument such as a guitar or violin a thinner string will generally make a higher note, but also shortening the string by stopping it with the finger will produce a similar effect. On a set of pan pipes or a church organ it is the shorter pipes which make the higher notes when the air inside them vibrates.
Another factor which produces higher pitched notes is the tension within the vibrating object. A guitar string can be tuned to a higher pitch by adjusting the string tensioner. An elastic band can be stretched tighter and a drum skin can be tensioned to increase the pitch of the sound it produces.
balanced chemical equations a) Sodium + Oxygen
b) Potassium + Chlorine
c) Hydrogen + Chlorine
d) Nitrogen + Hydrogen
e) Calcium + Nitrogen
f) Calcium carbonate
8) Zinc + Hydrochloric acid Zinc chloride + Hydrogen h) Ammonia + Nitrogen - Calcium nitride Carbon dioxide + Calcium oxide Ammonium nitride
Answer:
a) sodium oxide
b) potassium peroxide
c) Hydrogen chloride
d) form ammonia
e) Calcium nitride
what is waves is energy passing through the medium of water? true or false
i have no idea what you said but for the sake of god its true
elements of the fourth period fill the 4s sublevel with electrons before filling the 3d sublevel. Also, some elements move an electron from a filled 4s sublevel to an unoccupied 3d sublevel. Explain these behaviors
Answer:
Elements fill the lowest energy subshells first(Aufbau's rule), and the 4s subshell is lower energy than the 3d, making the labeling deceiving. In some rare situations, the electrons would rather have Hund's rule be respected more, having all electrons facing one way with no doubled up because it is more stable(these are pretty rare and usually deal with transition metals like copper).
Hope this helps!
Explanation:
As it has less energy than the 3d orbital, the 4s orbital fills next. Following the filling of the electrons, 4s has more energy than 3d. Therefore, the two electrons in the 4s are at a higher energy than they could be in the 3d since it has a vacancy. As a result, electrons transition from a higher to a lower energy orbital.
What are electrons ?The elementary electric charge of the electron is a negative one, making it a subatomic particle. Due to their lack of components or substructure, electrons, which are part of the lepton particle family's first generation, are typically regarded to be elementary particles.
Since 4s electrons are bound by the nucleus farther away and more loosely than 3d electrons, 4s electrons are eliminated first rather than 3d electrons.
The 4s orbital should always be filled before the 3d orbitals, according to the Aufbau principle, although this isn't the case for the majority of elements. After Sc, electrons actually enter the 3d orbitals first because they have a lower energy than the 4s orbital.
Thus, electrons transition from a higher to a lower energy orbital.
To learn more about an electron, follow the link;
https://brainly.com/question/1255220
#SPJ2
how do i find the name of an element
Answer:
The periodic table will say it underneath the symbol.
Explanation:
I don't know how else to describe it but I hope this helps. :)
I need help, plz help me with this problem
Answer:
It's b
Explanation:
I had the same exact question
two different isotopes of an element have different
Answer:
atomic weight or number of neutrons.
Explanation:
An isotope: is one of two or more forms of the same chemical element.
Different isotopes of an element have the same number of protons in the nucleus, giving them the same atomic number.
A different number of neutrons giving each elemental isotope a different atomic weight.
Jeremy left his bike outside overnight. When he woke up in the morning, there were water drops on the seat. When he went to ride his bike after lunch, he saw the water drops had disappeared. Which statement best describes what happened to the water?
A. The energy from the sun caused the water drops to condense.
B. The energy from the sun caused the water on the seat to boil.
C.The energy from the sun cooled the water, causing it to evaporate.
D.The energy from the sun heated the water, causing it to evaporate.
Answer:
D
Explanation:
a,b, and c wouldn't cause the reaction that Jermey expirenced
which aqueous solution has the lowest vapor pressure?
Answer:
Since all of them are aqueous solutions, the solvent in each solution is H2O. Based on the Raoult's Law, we only have to determine which solution contains the highest mole fraction of the solvent, H2O. The solution that will have the lowest vapor pressure is a. 0.20 m Na2SO4.
Explanation:
plz give brainliest
Why are polyatomic called radicals
Which materials are used to make concrete select all that apply
Answer:
cement air water sand and gravel
Explanation:
Answer:
Explanation:
The principal ingredients that make up the concrete mix are: cement, fine aggregate, coarse aggregate, water, chemical admixtures, and mineral admixtures.
a bond in which only one pair of
electrons is shared?
Answer:
A single covalent bond
Explanation:
A single covalent bond is when only one pair of electrons is shared between atoms. A sigma bond is the strongest type of covalent bond, in which the atomic orbitals directly overlap between the nuclei of two atoms.
Answer:
Single covalent bond.
Explanation:
Single covalent bond is the type of bond in which only one pair of electrons is shared between atoms.
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AH1807explain why titanium conducts electricity
Answer:
Because they are electrical conductors because their delocalized electrons carry electrical charge through the metal. they are good conductors of thermal energy because their delocalized electrons transfer energy.
I hope it helps.
True or False. When light passes from one medium to another the speed changes.
Answer:
Its actually true
Explanation:
Your Welcome Canada,
OH YEAH!!!!!!
Answer:
The correct answer is "True".
Explanation:
I hope this helps!
what is the chemical formula of tetraphosphorus heptasulfide?
Answer: P4S7
Explanation:
How many moles of AgNO3 must react to form 0. 854 mol Ag? mol AgNO3.
The moles of silver nitrate required to form 0.854 mol silver ion has been 0.854 mol.
The balanced chemical equation for the dissolution of silver nitrate has been:
[tex]\rm AgNO_3\;\rightarrow\;Ag^+\;+\;NO_3^-[/tex]
The aqueous solution of silver nitrate has been dissociated into the constituent silver and nitrate ions.
In a balanced chemical equation, the coefficient has been equivalent to the moles of each reactant forming the moles of product.
From, the balanced equation,
[tex]\rm 1\;mol\;AgNO_3=1\;mol\;Ag[/tex]
The given moles of Silver has been 0.854 mol. Thus, the moles of silver nitrate required has been given as:
[tex]\rm 1\;mol\;Ag^+=1\;mol\;AgNO_3\\0.854\;mol\;Ag^+=0.854\;\times\;1\;mol\;AgNO_3\\0.854\;mol\;Ag^+=0.854\;mol\;AgNO_3[/tex]
The moles of silver nitrate required to form 0.854 mol silver ion has been 0.854 mol.
For more information about the moles produced, refer to the link:
https://brainly.com/question/10606802
What is the chemical composition of dry ice?
Answer:
Dry ice is the solid form of carbon dioxide (CO 2), a molecule consisting of a single carbon atom bonded to two oxygen atoms. Dry ice is colorless, odorless, and non-flammable, and can lower the pH of a solution when dissolved in water, forming carbonic acid (H 2 CO 3).
Explanation: i asked my teacher and this was her response.
Which compound contains both sigma and pi bonds? HCCl3 H2CO H2S HBr.
The compound that contains both sigma and pi bonds has been [tex]\rm \bold{H_2CO}[/tex]. Thus, option B is correct.
The compounds have been resulted by the sharing of the valence electrons between atoms, for the completion of octet of each elements.
The bonds can be saturated with the presence of only sigma bond. The unsaturated bonds has presence of pi bonds as well. The bond with one pi and one sigma has been a double bond, while 1 sigma and 2 pi has been a triple bond.
The bonds present in the following structures has been:
[tex]\rm HCCl_3=4\;\sigma\;bonds\\H_2CO=2\;\sigma,\;1\;\pi\;bond\\H_2S=2\;\sigma\;bonds\\HBr\;=1\;\sigma\;bond[/tex]
The compound with the presence of both sigma and pi bonds has been [tex]\rm \bold{H_2CO}[/tex]. Thus, option B is correct.
For more information about the sigma and pi bonds, refer to the link:
https://brainly.com/question/14018074