Answer:
[tex]1)kidneys \\ 2)excretory \\ \: \: 3)valve \\ \: 4)reproductive \\ \: 5)circulatory \\ \: 6)circulatory \\\ \: 7)trachea \\ \\ \\ plzz \: mark \: as \: brainliest[/tex]
Types of osmosis...in 50 words
Osmosis is of two types:
Endosmosis– When a substance is placed in a hypotonic solution, the solvent molecules move inside the cell and the cell becomes turgid or undergoes deplasmolysis. This is known as endosmosis.
Exosmosis– When a substance is placed in a hypertonic solution, the solvent molecules move outside the cell and the cell becomes flaccid or undergoes plasmolysis. This is known as exosmosis.
There are some variations or types of osmosis on the basis of the direction of the movement of solvent molecules.
Reverse osmosis is a method of separation that is used to force a solvent through a semi-permeable membrane resulting in solute molecules on one side and solvent molecules on the other side.Reverse osmosis is different than the forward osmosis in that reverse osmosis utilized hydraulic pressure to force the solvent against the osmotic pressure.Forward osmosis is another variation of osmosis where the osmotic pressure gradient is used to induce the flow of water from the sample solution to separate the solutes.Forward osmosis uses a draw solution with a higher concentration of solute, which extracts the solvent molecules from the sample solution; thus, resulting in the separation of solute and solvent in the sample solution.Endosmosis is the movement of water into the cell which occurs when a cell is placed in a solution having a higher concentration of water than the cell.Exosmosis is the movement of water out of the cell which occurs when a cell is placed in a solution having a higher concentration of solute than the cell.Help me (number 5).
Answer:
a. HF
Explanation:
Which element has the following complete electron configuration : 1s22s22p63s23p64s23d5?
Answer:
Manganese
Explanation:
The electronic configuration of the atom is:
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁵
The powers in this configuration is the number of electrons in each orbital:
2 + 2 + 6 + 2 + 6 + 2 + 5 = 25
The compound has 25 electrons and it is Manganese
The electron configuration 1s22s22p63s23p64s23d5 corresponds to the element manganese (Mn).
In the electron configuration provided:
1s2 represents the filling of the 1s subshell with two electrons.
2s2 represents the filling of the 2s subshell with two electrons.
2p6 represents the filling of the 2p subshell with six electrons.
3s2 represents the filling of the 3s subshell with two electrons.
3p6 represents the filling of the 3p subshell with six electrons.
4s2 represents the filling of the 4s subshell with two electrons.
3d5 represents the filling of the 3d subshell with five electrons.
Based on this electron configuration, we can correctly identify the element as manganese (Mn), which has an atomic number of 25.
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CHEMISTRY QUESTIONS // 30 POINTS
WILL GIVE BRAINLIEST
1. All nonmetals (except hydrogen) have 8 valence electrons?
True or False
2. The N^-3 ion is classified as a(n) ____ and has ____.
A. anion, 8 valence electrons
B. cation, 8 valence electrons
C. anion, 15 valence electrons
D. anion, 3 valence electrons
3. If two nonmetals react to form a compound and have very different _____ they form ____ bonds. If there is a small difference, then they form ____ bonds.
A. ionization energy; covalent; nonpolar ionic
B. electronegativity; nonpolar covalent; polar covalent.
C. ionization energy, ionic, nonpolar covalent
D. electronegativity, polar covalent, nonpolar covalent.
Answer:
yesyeysesyesyesyesteys
Can somebody help me answer this?
A student claims that a large percentage of water on Earth is immediately available to drink. Is he correct? Why or why not?
Answer:
No, the student is not correct. The earth may have a lot of water... but not every part of water is drinkable. Most water is filled with bacteria and or viruses making it not suitable to drink! :)
Explanation:
HOPE THIS HELPS! BRAINLIEST? :)
What type of reaction is show below? MgBr2 (s) --> Mg (s) + Br2 (I)
Answer:
Option D. Decomposition reaction
Explanation:
MgBr₂ (s) —> Mg (s) + Br₂ (l)
To know which option is correct. It is important that we have an understanding of what each option means.
1. Synthesis reaction: This is a type of reaction in which two different elements react to produce a new compound different from the two elements that reacted. e.g
A + D —> AD
2. Combustion reaction: This is a reaction which involves a compound and oxygen to produce carbon dioxide (CO₂) and water (H₂O) e.g methane (CH₄) undergoes combustion reaction as follow:
CH₄+ 2O₂ —> CO₂ + 2H₂O
3. Single Replacement reaction: This is a reaction in which one element replaces or displaces another element in a single compound. This is illustrated below:
X + WZ —> XZ + W
We can see that the X replaces W in the reaction.
4. Decomposition reaction: This is a type of reaction in which a compound decompose or breaks into two or more simple compounds or elements e.g
ZX₄ —> Z + 4X
From the above illustrations, we can conclude that the the reaction:
MgBr₂ (s) —> Mg (s) + Br₂ (l)
Is a decomposition reaction because MgBr₂ breakdown into Mg and Br₂
How many moles and atoms are there in 60 grams of Calcium?
Answer:
The moles present in 60 g of calcium are 1.5 moles.
Answer:
In 60 grams there are 1,5 mols
Explanation:
Why can Solids Support Objects Easier Than Fluids
Answer:
because the particles in solids are more close together and strong so they would support it better than fluid because fluid particles are spread out
Explanation:
Have A Wonderful Day !!
Due to properties of solid substances, they support objects easier than liquid.
Solids can support objects easier than fluids because in solid, particles are present on fix place as compared to liquid which is not fix and can move from one place to another. In Solid substances, particles are fix so they provides better support to the objects which are placed on them.
While on the other hand, in liquid substances particles are mobile so they are not considered better supporter for objects so we can conclude that due to properties of solid substances, they support objects easier than liquid.
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___ is a measure of gravity's pull on an object.
Volume
Weight
Mass
Answer:mass
Explanation:
Answer:
weight is the measure of the force of gravity pulling on the object. mass is the measure of the object's matter.
A wave in which particles of matter vibrate at right angles to the direction
the wave travels is called a(n) wave.
Enter the answer
Check It
Answer:
it will transverse wave I think it will help you
Enter a complete ionic equation to show the reaction of aqueous Hg2(NO3)2 with aqueous sodium chloride to form solid Hg2Cl2 and aqueous sodium nitrate. Express your answer as a complete ionic equation. Identify all of the phases in your answer.
Answer: [tex]Hg_2^{2+}(aq)+2NO_3^-(aq)+2Na^+(aq)+2Cl^-(aq)\rightarrow Hg_2Cl_2(s)+2Na^+(aq)+2NO_3^-(aq)[/tex]
Explanation:
A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.
A double displacement reaction in which one of the product is formed as a solid is called as precipitation reaction.
The balanced chemical equation is:
[tex]Hg_2(NO_3)_2(aq)+2NaCl(aq)\rightarrow Hg_2Cl_2(s)+2NaNO_3(aq)[/tex]
The complete ionic equation will be :
[tex]Hg_2^{2+}(aq)+2NO_3^-(aq)+2Na^+(aq)+2Cl^-(aq)\rightarrow Hg_2Cl_2(s)+2Na^+(aq)+2NO_3^-(aq)[/tex]
Write complete electron configuration for each of the
following elements:
(a) scandium
(c) bromine
(b) cesium
(d) oxygen
An angry science student drops his textbook out of a second story window. Why does it fall to the ground? You may
choose more than one response.
A.The net force acting on the book by gravity is down.
B The drag force of the air pulls it down.
The student let the book go, removing the force of his hand.
D There is a strong magnetic force between the book and the ground.
Answer:
I think qs. "A" the net force acting on the book by gravity is down..
The statement is "The net force acting on the book by gravity is down."
What is gravity?Gravity is defined as the force that pulls materials toward the center point of a planet or other entity.
The textbook falls to the ground because of gravitational attraction between the ground and the book.
Because of the Earth's gravitational influence, the textbook moves towards the Earth when nothing is keeping it up. We know that the book has an equivalent impact on the Earth.
With a free fall acceleration of g, the textbook accelerates toward the Earth.
Hence, the correct option is A
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Cu(NO3)2 is what compound?
Answer:
the compound's name is copper nitrate
How does the number of molecules in 1 mol of oxygen compare with the number of molecules in 1 mol of nitrogen?
1 mol of oxygen has fewer molecules.
1 mol of oxygen has more molecules.
Each sample has the same number of molecules.
The molecules cannot be compared without knowing the mass.
Answer:
Each sample has the same number of molecules.
Explanation:
Just took the quiz on edge 2021
Taking into account the definition of Avogadro's number, each sample has the same number of molecules.
Avogadro's NumberAvogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole.
Avogadro's number applies to any substance.
This caseAvogadro's number applies to any substance. This means that the number of molecules in 1 mol of oxygen is equal to the number of molecules in 1 mol of nitrogen.
Finally, the correct answer is the third option: each sample has the same number of molecules.
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To be effective, a certain drug must not drop below 15 mg in the body. A 120
mgs of that drug was administered to a patient. How much time will it take for that drug to reach the 15 mg minimum level. The drug's half-life is 30 minutes.(show how you arrived at your response)
Answer:
90 Minutes
Explanation:
Original concentration = 120 mg
Half life = 30 minutes
Minimum level = 15 mg
Basically, we are to calculate the time it would take to drop from 120 mg to 15 mg.
The half life of a substance is the time it takes for the original concentration of a substance to drop to half it's starting concentration.
First Half life:
Starting concentration = 120mg
Concentration after half life = 120 / 2 = 60 mg
Second Half life;
Starting concentration = 60 mg
Concentration after half life = 60 / 2 = 30 mg
Third Half life;
Starting concentration = 30 mg
Concentration after half life = 30 / 2 = 15 mg
We have reached the minimum 15 mg level. This means it took three half lives to get there.
Total time taken = No of Half lives * Half life duration = 3 * 30 mins = 90 Minutes
Does anyone know what I should put for number 2 if you KNOWW plssss
Are the activities exothermic or endothermic?
Answer:
The first 5 are exothermic reaction because heat is in product means heat is evolved or given out.
And last no reaction shows that heat is required so last reaction is endothermic reaction.
Explanation:
And heat is evolved in exothermic reaction and heat is absorbed in endo thermic reaction
a. Among nonpolar liquids, those with higher molar masses tend to have normal boiling points that are (higher, lower, or about the same).
b. Among compounds of approximately the same molar mass, those with greater polarities tend to have enthalpies of vaporization that are (higher, lower, or about the same).
c. Which is the only noble gas listed that is stable as a liquid at 0°C? Explain your answer using the concept of critical temperature.
Answers are below...and I have answered this question on the basis of above table.
Explanation :-
(a.) Among nonpolar liquids, those with higher molar masses tend to have normal boiling points that are (lower).
(b.) Among compounds of approximately the same molar mass, those with greater polarities tend to have enthalpies of vaporization that are (higher).
(c.) Xe (Xenon), a substance can exist only as a gas at temperatures above its critical temperature. Of the noble gases listed, only Xe has a critical temperature above O°c.
Among nonpolar liquids, those with higher molar masses tend to have normal boiling points that are lower. Among compounds of approximately the same molar mass, those with greater polarities tend to have enthalpies of vaporization that are higher.Xenon can exist only as a gas at temperatures above its critical temperature.
What is a compound?Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.
Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:
1)Molecular compounds where in atoms are joined by covalent bonds.
2) ionic compounds where atoms are joined by ionic bond.
3)Inter-metallic compounds where atoms are held by metallic bonds
4) co-ordination complexes where atoms are held by co-ordinate bonds.
They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.
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4. Why is it important to neutralize an acid spill
before attempting to clean it up?
Answer:
It the acid easier to handel
3. If 12.5 grams of copper are reacted with excess chlorine gas, then 25.4 grams of
copper (II) chloride are produced. Calculate the theoretical yield and the percent
yield. Cu + Cl2 → CuCl2
Answer:
Percent yield = 99.6%
Theoretical yield = 25.5 g
Explanation:
Given data:
Mass of copper = 12.5 g
Mass of copper(II) chloride produced = 25.4 g
Theoretical yield = ?
Percent yield = ?
Solution:
Chemical equation:
Cu + Cl₂ → CuCl₂
Number of moles of copper:
Number of moles = mass/molar mass
Number of moles = 12.5 g / 63.5 g/mol
Number of moles = 0.19 mol
Now we will compare the moles of copper and copper chloride.
Cu : CuCl₂
1 : 1
0.19 : 0.19
Mass of CuCl₂: Theoretical yield
Mass = number of moles × molar mass
Mass = 0.19 mol × 134.45 g/mol
Mass = 25.5 g
Percent yield:
Percent yield = (actual yield / theoretical yield )×100
Percent yield = ( 25.4 g/ 25.5 g) ×100
Percent yield = 99.6%
If the object floats in water, is its density lower or higher?
Answer:
Its has a lower density. Think about it, a ship in the water is long because if it wasn't it would have a higher density and sink. The ship needs to diperse its weight across the water to make it less dense.
Explanation:
Your welcome! Have a great day!
What is an empirical formula
An empirical shows the simplest ratio among atoms in a compound .
More informationan empirical formula is the simplest formula for a compound .For example, H2O2 can be reduced to a simpler formula. Determining a Molecular Formula from an Empirical Formula The empirical formula for a compound is P 2 O 5 . Its experimental molar mass is 284 g/mol.For example, the empirical formula of benzene (C5H5) is Qj, - because the mole ratio of carbon am'hydrogen is 1:1.Observe the image of sodium. List the properties you see.
Answer:
It is soft and white. It has a low melting and boiling point, a good conductor electricity, and reacts with water. Furthermore, it is also highly reactive, malleable, and ductile.
Explanation:
Hope I helped!
Answer:
silvery-white and waxy
Explanation:
Properties means the observations you can make just by looking at it or the qualities that the object has.
So when I looked at the sodium I saw a silvery-white metal (sodium is a metal), that has this waxy appearance to it.
The question at the beginning of todays reading is , In what ways do people use detectors why is it important to understand particles in order to invent detectors
Answer:
Explanation:
People use detector to know the ionization of electromagnetic radiation i.e alpha, beta and gamma radiation and the output produced.
In the past, the early detectors use photographic plates which is use to detect tracks due to nuclear reactions.
It is important to know particles before inventing detectors because detectors produces visible trajectories or tracks as a result of particles that are charged which can traverse the apparatus. It was used to detect the positron and also muons and these w are particles that are produced by cosmic rays which is as a result of their interaction in the Earth's atmosphere.
Identify the formula for ammonium nitrate
(NH4)3NO3
NH4(NO2)2
NH4NO2
Answer:
NH₄NO₃
Explanation:
In salt naming, the cation is named first, then you must put the name of the anion. In the same way when you are writting the formula. Also, the global charge of a salt is always 0.
Thus, we must write each ion and its charge:
Ammonium: NH₄⁺
Nitrate: NO₃⁻
As both ions have the same charge, the formula is:
NH₄NO₃The cation first and then the anion.
If the [H+] of a solution is 6.8 x 10-9 mol/L the pH is
Answer:
8.2
Explanation:
To solve this problem;
The concentration of [H⁺] = 6.8 x 10⁻⁹mol/L
So, we need to convert this to pH:
pH = -log [H⁺]
So;
pH = -log 6.8 x 10⁻⁹ = 8.2
Estimate: Press Reset. Select Atoms, and using the slider, start with 1.000 × 1023 atoms of sulfur. (Note that pressing Start puts atoms into the atom counter, not the jars.)
Is this amount more or less than one mole?
Place the jar underneath the counter. Was the jar completely filled?
How many moles do you have?
Answer:
1) The amount is less than one mole, 2) The jar is not completely filled, 3) We have 0.166 moles of sulfur.
Explanation:
We proceed to respond each question below:
1) Is this amount more or less than one mole?
According to the Avogadro's Number, one mole of an element contains about [tex]6.022\times 10^{23}[/tex] atoms. Given that we have [tex]1.000\times 10^{23}[/tex] atoms, then we conclude that this amount is less than one mole.
2) Place the jar underneath the counter. Was the jar completely filled?
Let suppose that the jar can contain up to a mole of sulfur. Then, we conclude that jar is not completely filled.
3) How many moles do you have?
The amount of moles is determined by dividing the current amount of atoms by Avogadro's Number:
[tex]x = \frac{1.000\times 10^{23}\,atoms}{6.022\times 10^{23}\,\frac{atoms}{mole} }[/tex]
[tex]x = \frac{500}{3011}\,mole[/tex]
We have 0.166 moles of sulfur.
Chemistry 1 - Types of Radioactive Decay
Answer:
Explanation:
The reaction expression is given as:
⁴⁰₁₈ Ar → X + ⁰₁B
To solve this problem, we must bear in mind that both mass number and atomic number must be conserved.
So;
For the mass number:
40 = A + 0
A = 40
For atomic number:
18 = Z + 1
Z = 18 - 1 = 17
An atom is identifiable by the atomic number. Since the atomic number of X is 17 then it is Cl, chlorine