Octopus and squids breathe like fishes they breathe from gills
so even octopus and squids breathe through gills too.
maybe this answer would help u
How many protons are in an oxygen atom.
Answer:
Hello
there are 8 protons in oxygen atom
Explanation:
thanks...hope it helps
Calculate the molarity of a solution containing 21.9g of MgCl, in enough water to
make a 750.mL solution.
We need a 3.0M aqueous HCl solution to dissolve the middle of a penny which is made of nickel. What mass of HCl is contained in 2.40 L of a 3.0M solution?
Answer:
262.8 g
Explanation:
Molarity = 3.0M
Mass = ?
Volume = 2.40L
The relationship between these quantities is given as;
Molarity = Number of moles / Volume
Number of moles = Molarity * Volume
Number of moles = 3 * 2.4 = 7.2 mol
Mass = Number of moles * Molar mass
Molar mass of HCl = 1 + 35.5 = 36.5 g/mol
Mass = 7.2 * 36.5 = 262.8 g
Answer:
262.44 grams of HCl is contained in 2.40 L of a 3.0 M solution.
Explanation:
Molarity (M) or Molar Concentration is the number of moles of solute that are dissolved in a certain volume.
Molarity is calculated as the number of moles divided by the volume of the solution:
[tex]Molarity=\frac{number of moles of solute}{volume of solution}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
In this case:
Molarity= 3 MNumber of moles of solute= ?Volume of solution= 2.4 LReplacing:
[tex]3 M=\frac{number of moles of solute}{2.40 L}[/tex]
and solving you get:
number of moles of solute= 3 M* 2.40 L
number of moles of solute= 7.2 moles
Being the molar mass of HCl 36.45 g/mole, then you can apply the following rule of three: if 1 mole has 36.45 grams, 7.2 moles how much mass does it have?
[tex]mass of HCl=\frac{7.2 moles*36.45 grams}{1 mole}[/tex]
mass of HCl= 262.44 grams
262.44 grams of HCl is contained in 2.40 L of a 3.0 M solution.
80g of Sodium react with 40g of Chloride to produce a product of Sodium Chloride. How many grams of sodium chloride will be present after this chemical reaction?
Na2 + 2Cl2 —> 2NaCl2
Students in Ms.Tillman’s class added 100 grams of copper to 15 grams of oxygen. A chemical reaction occurred produced copper oxide, as shown in the equation below
2 Cu + ___O2 —> 2 CuO
What type of reaction is this?
How many total grams should be present at the end of the chemical reaction?
Give me lil reasoning so I know your not lying for points
:(
(I’ll mark you as brainlister )
Answer:
C
Explanation:
An inverse relationship means that as one increases the other decreases. From the negative slope of this graph, you can tell that as volume increases, pressure decreases. If you look at the data point for 20 on the volume axis, it matches up with about 240 on the pressure axis.
write an ionic half equation for the formation of hydrogen during this electrolysis
Answer:
A half-equation shows you what happens at one of the electrodes during electrolysis. Electrons are shown as e-. A half-equation is balanced by adding, or taking away, a number of electrons equal to the total number of charges on the ions in the equation.
When positive metal ions (cations) arrive at the negative electrode (the cathode), they gain electrons to form neutral metal atoms. This is called reduction. For example:
Pb2+ + 2e- → Pb
When negative non-metal ions (anions) arrive at the positive electrode (the anode), they lose electrons to form neutral atoms or molecules. This is called oxidation. For example:
2Br- → Br2 + 2e-
Writing half equations
Cations go to the cathode. They need to gain enough electrons to make them neutral. So an Al3+ ion needs to gain three electrons:
Al3+ + 3e- → Al
Half-equations for non-metal anions are more difficult to balance. For example, chloride ions make chlorine gas. Most non-metal elements formed in electrolysis are diatomic molecules (eg Cl2). For example:
Cl- → Cl2
Add in two electrons to balance the charge so that both sides have the same charge. The two electrons need to go on the right-hand side, so that both sides have an overall charge of -2. For example:
2Cl- → Cl2 + 2e-
Although your question lacks some information a general answer is provided
The ionic half equation = [tex]2H^{+} (aq) + 2e^{-} ----> H_{2} (g)[/tex]
The formation of hydrogen takes place at the negative electrode in a cell and the ionic half reaction that shows the formation of the hydrogen gas at the electrode is written as :
[tex]2H^{+} (aq) + 2e^{-} ----> H_{2} (g)[/tex]
Ionic half equation is the representation of the chemical activity ( reaction ) occurring at one of the electrodes of a cell. to balance a half reaction we add or remove electrons equal to charges on the ions.
Hence the Ionic half equation for the formation of hydrogen during electrolysis is written as ; [tex]2H^{+} (aq) + 2e^{-} ----> H_{2} (g)[/tex]
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Which choice represents a compound?Required to answer. Single choice.
(1.5 Points)
Cu
Fe
CO
Br
Answer:
CO
Explanation:
Elements will only one capital letter, that may/may not have a lower case letter after it. CO has a capital letter followed by another capital, so it's a compound
Help please
what is the half-life of c-14 at 250g?
Answer:
5,730 years
hope im right
Explanation:
Its half-life is 5,730 years. How much of a 250g sample of carbon-14 will be left in 5,000 years?
Is the fractional distillation of liquefied air a physical or chemical change?
Answer:
Physical Chanhe is the answer : )
HELP WITH THIS WORD PROBLEMStudents want to gather evidence for the claim that the number of atoms present before a chemical reaction is equal to the number of atoms present after the chemical reaction. They decide to react vinegar and baking soda in a sealed plastic bag. Which of the following would provide the evidence the students need?
The mass of the plastic bag, baking soda, and vinegar before the reaction was equal to the mass after the reaction.
Bubbles were produced during the reaction, which meant that a gas was being produced
.The plastic bag did not change in any way, indicating that it was not involved in the reaction.
The mass of the baking soda was exactly equal to the mass of the vinegar used to create the chemical reaction.
Classify the following as homogeneous or heterogeneous mixtures, or pure
we
is a pure substance, whether it is an element or a
Mixture: homogeneous/
Substance
heterogeneous
Pure substanca
element companie
2.1 Sugar
2.2 Magnesium ribbon
2.3 Vegetable soup
2.4 Bath oil
2.5
Tin of assorted biscuits
2.6
Peanuts and raisins
2.7 Copper wire
2.8
Bicarbonate of soda
(Baking soda)
Explanation:
Sugar - Pure substance
Magnesium Ribbon - Pure Substance
Vegetable soup Heterogeneous mixture
Bath oil - Homogeneous mixture
Tin of assorted biscuits - Heterogeneous mixture
Peanuts and raisins - Heterogeneous mixture
Copper wire - Pure Substance
Bicarbonate of soda (Baking soda) - Pure Substance
answer pls ill give brainly
How is energy from the sun used as food energy by organisms in an ecosystem?
Energy from the sun is absorbed as heat by consumers.
Energy from the sun is absorbed by fungi, and it is then passed on to consumers.
Energy from the sun is converted into food energy by producers, which is then passed on to consumers.
Energy from the sun is converted into food by consumers, which is then passed on to producers.
Answer:
its absorbed by heat from consumers
HELPPPP!!!!
Four students were asked to identify the part of an atom that determines the atom's identity and chemical properties. The student's responses are shown in the chart below. Which of the student's responses is correct?
Answer:
The number of protons is what determines a atoms identity.
This means that student 3 is correct.
Explanation:
Which of the following would have three iron atoms in its formula? Iron oxide, iron Ill oxideiron phosphide, or iron phosphide.
Answer:
1 and 4 and 24
Explanation:
I know this because i passed 1st grade
A closed gas system initially has pressure and volume of 0.922 atm and 4.64L with the temperature unknown. If the same closed system has values of 1030 torr, 4.36 L, and 837K, what was the initial temperature in K?
Answer:
606.09K
Explanation:
Using the combined gas law equation;
P1V1/T1 = P2V2/T2
Where;
P1 = initial pressure (atm)
P2 = final pressure (atm)
V1 = initial volume (L)
V2 = final volume (L)
T1 = initial temperature (K)
T2 = final temperature (K)
According to the provided information in the question;
P1 = 0.922atm
P2 = 1030torr = 1.355atm
V1 = 4.64L
V2 = 4.36L
T1 = ?
T2 = 837K
Using P1V1/T1 = P2V2/T2
0.922 × 4.64/T1 = 1.355 × 4.36/837
4.278/T1 = 5.9078/837
Cross multiply
5.9078T1 = 837 × 4.278
5.9078T1 = 3580.69
T1 = 3580.69/5.9078
T1 = 606.09K
Help please you don’t need to show work
Answer:
24.07
Explanation:
what is similar about the comparison of pluto and ceres?
Answer:Difference between Ceres and Pluto
Nestled in the asteroid belt between Mars and Jupiter, Ceres is a tiny loner, while Pluto — in the Kuiper Belt at the edge of the solar system — is nearly three times as big and hosts a handful of moons. A mixture of rock and water ice dominates Ceres' landscape, while methane and nitrogen ices cover Pluto
Explanation:
- Wind and water sometimes carry
topsoil from one place to another. A
word that describes this process is?
A Substratum
B> Flow
Erosion
D Decay
Answer:
erosion is the right answer
Calculate the change in heat (Q) that occurs when 7.58grams of steam at 101°C cools to liquid water at 40°C. (cp = 4.184 J/g°C)
Answer:
Q = 19065.4 J
Explanation:
Q₁ = the required energy for phase change of H₂O from vapor to liquid
Q₁ = mass of H₂O * heat of vaporization
Q₁ = 7.58 g * 2260 J/g
Q₁ = 17130.8 J
Q₂ = energy required to cool the water fro 101°C to 40°C
Q₂ = mass of H₂O * specific heat of H₂O * ΔT
Q₂ = 7.58 × (4.184 J/gC) × (101 - 40)
Q₂ = 1934.6 J
Q = Q₁ + Q₂
Q = (17130.8 + 1934.6) J
Q = 19065.4 J
40 points
I have 400 mL of a 0.2 M simple syrup solution (made up of just sugar and water) that I want to boil down to result in a solution with a concentration of 0.5 M. How many milliliters of water would I need to evaporate?
Answer:
2000ml
Explanation:
you multiple 400ml with 0.5 ml to get the required meter for the water that needs to be evaporated
The calorimeter pictured below shows the final temperature after calcium chloride was added to water. (The initial temperature was 25°C.) Which of the following best describes what occurred within the calorimeter?
A. Only Bond forming occurred
B. The bonds that formed were the most part stronger than the bonds that were broken
C. More energy was absorbed in breaking bonds than was released when new bonds form
D. As the powder dissolved, the breaking of bonds released energy
Answer:
The answer is acctualy B
Explanation:
I did the gizmo
The calorimeter has the final temperature rise with the addition of calcium chloride as formation of bonds stronger than the bonds that are broken. Thus option B is correct.
There has been increased in the temperature as the breaking of bonds has released energy in the solution. With the high energy in the solution, the part of the energy has been used for the bond formation. However the rise results as the bonds formed are stronger than the bonds broken.
The calorimeter has the final temperature of [tex]\rm 52^\circ C[/tex]. The addition of calcium chloride results in a rise in temperature. This has resulted in the formation of bonds stronger than the bonds that are broken. Thus option B is correct.
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In a warehouse, the workers sometimes slide boxes along the floor to move them. Two boxes were sliding toward each other and crashed. The crash caused both boxes to change speed. Based on the information in the diagram, which statement is correct? In your answer, explain what the forces were like and why the boxes changed speed.
Box 1 has more mass than Box 2.
Box 1 and Box 2 are the same mass.
Box 1 has less mass than Box 2.
Answer:
Box 1 and Box 2 are the same mass.
Explanation:
Because they both change speed due to having the same mass!
Hope this helps! :) BRAINLIEST PLZ
A teacher tells the student to dlaw the same wave with double the frequency, while keeping the amplitude the same. How would the student draw the new wave?
Answer:
A.
Explanation:
Frequency is how often one complete cycle or wave takes place. Amplitude is the height of the wave from the midpoint to the crest.
The new drawing should have twice as many waves in the same period of time, with the same height wave.
Answer:
A.)
Explanation:
Frequency is how often one complete cycle or wave takes place. Amplitude is the height of the wave from the midpoint to the crest.
The new drawing should have twice as many waves in the same period of time, with the same height wave.
please help!! will give brainliest if u tell me how
Why does heat transfer from object to object?
Select one:
a.Heat transfers because of the temperature differences between objects
b.Heat transfers because of the mass difference between objects
c.Heat does not transfer between objects
d.Heat is energy so it moves
2 NH3(g) → N2(g) + 3 H2(g)
What type of reaction is shown above?
A)
single replacement
B)
decomposition
C)
double replacement
D)
synthesis
Answer:
Decomposition Reaction
Explanation:
In the provided reaction, we can see that Ammonia is getting decomposed into Nitrogen and Hydrogen gas.
Another way to think about it is that Decomposition is nothing but one thing giving rise to 2 or more than 2 things.
Since our Ammonia is giving rise to 2 gases, this reaction is an example of Decomposition reaction
Select all of the answers that apply.
multiple selection answer
Surface currents are driven by _____.
salinity
density
wind
temperature
the moon
[tex]\mathfrak{\huge{\orange{\underline{\underline{AnSwEr:-}}}}}[/tex]
Actually Welcome to the Concept of the Geography.
Surface currents in a ocean or a sea are driven by Winds.
Answer:
winds :)
Explanation:
What challenges or opposition did Galileo face in having his theories accepted and why
Answer:
Poorness is the one because he needs large money for his inventions and tools to use in them. He also have problems in securing patent protection and dealing with publishing pressure.
But the greatest problems is the opposition of his discoveries by the Catholic Church, they banned his books, they abstain him from teaching inventing, and writing. But as we know, a hero stands even on the hardest times
Explanation:
The challenges or opposition to Galileo Galilei, an astronomer, and mathematician, struggled with issues that contemporary scientists would recognize, such as obtaining funding, acquiring patent protection, and coping with the urge to publish.
Who was Galileo?Galileo was an astronomer and scientist. He was from Italy. He is a famous scientist and did many discoveries in the field of astronomy. The main discoveries were craters and mountains on the moon and the stars of the galaxy.
He was criticized for believing in the kinetic hypothesis, and he denied astronomical authority. The challenges he faced were patent problems and funding problems.
Thus, Galileo was criticized for defending the kinetic hypothesis and denying the astronomical authority of Scripture.
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How many atoms in this molecule have a tetrahedral molecular geometry?
In the given molecular geometry, two atoms (C and O) have a tetrahedral molecular geometry.
What is tetrahedral geometry?The tetrahedral geometry is formed when there are four bonds all on one central atom. According to the VSEPR theory, the bond angles between the bonds are 109.5°.
Methane has tetrahedral geometry and the four equivalent bonds in 3 D corresponding to the four corners of a tetrahedron centered on the carbon atom.
In the given molecule, the carbon is attached to three hydrogens and one carbon atom with bond angles of 109.5° have a tetrahedral geometry and shape.
The oxygen atom is attached to two carbon atoms with bond angles of approximately 104.5° and contains two lone pairs. The oxygen atom has a tetrahedral molecular geometry. The oxygen atom is of the form AX₂E₂ and has bent shapes similar to the shape of water.
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Two atoms (C and O) in the specified molecular geometry have a tetrahedral molecular geometry.
When four bonds are present on the same core atom, the tetrahedral geometry is created. The bond angles between the bonds are 109.5° in accordance with the VSEPR hypothesis.
The four analogous bonds in three dimensions that make up methane correspond to the four corners of a tetrahedron that is centred on the carbon atom. Methane has a tetrahedral shape.
One carbon atom with a bond angle of 109.5° and a tetrahedral geometry makes up the carbon in the given molecule, which is joined to three hydrogen atoms.
Thus, with bond angles of roughly 104.5° and two lone pairs, the oxygen atom is joined to two carbon atoms. Tetrahedral molecular geometry characterises the oxygen atom.
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how do i make chrystals
Answer:
1. In the beaker, stir 1/2 cup of Epsom salts with 1/2 cup of very hot tap water for at least one minute. ...
2. Add a couple drops of food coloring if you want your crystals to be colored.
3. Put the beaker in the refrigerator.
4. Check on it in a few hours to see a beaker full of epsom salt crystals!
Explanation:
the reaction 2F2+ 2H2O + 4HF + 02 find the number of moles of oxygen produced from 10 moles of fluorine
Answer:
20 moles of Oxygen
Explanation:
2F2 + 2H20 -> 4HF + O2
We have 10 moles of fluorine. Based on the reaction equation, we see that:
n O2 = 2 * n F2 (n is the number of moles)
=> n O2 = 2 * 10 = 20 (moles)
Because of this, the number of moles of oxygen is 20 moles.