HELP HELP PLEASE ILL GIVE BRAINLEST
compare the circulatory system of a frog and the circulatory system found in humans
Answer:
Frogs have three circuits for their circulation, unlike humans who only have two. Like humans, however, frogs have a systemic circuit, which pumps oxygenated blood throughout the body. The pulmonary circuit moves blood to the lungs to pick up oxygen.
Explanation:
Answer:
A
Explanation:
Which of the following could result from a substance that undergoes a physical change
Answer:
B. It undergoes phase change.
Explanation:
Aspirin (acetyl salicylic acid) is a weak acid with the chemical formula HC9H7O4. The solubility of aspirin is 4.6 g per 1.00 L solution, and a saturated solution of aspirin has a pH of 2.56. Write the expression (chemical equation) that describes the saturated solution.
Answer:
HC₉H₇O₄(aq) + H₂O(l) ⇄ C₉H₇O₄⁻(aq) + H₃O⁺(aq)
Explanation:
A weak acid as aspirin, HC₉H₇O₄, is in equilibrium with water as follows:
HC₉H₇O₄(aq) + H₂O(l) ⇄ C₉H₇O₄⁻(aq) + H₃O⁺(aq)This is the chemical equation that describes the process.
As you can see, not all aspirin is dissolved, just a part that is converted in its conjugate base (A weak acid doesn't dissociate completely!).
Also, the pH is decreasing because the hydronium ion (H₃O⁺) is produced in the equilibrium (Remember, if you have an increasing in H₃O⁺ concentration the pH will decreases and vice versa).
Chemistry
H
D
G
A
S
F
F
F
G
Vv
F
F
F
F
F
Answer:
i think its f because my teacher have been talking about this
Explanation:
Answer:
f
Explanation:
According to the octet rule, an atom is usually stable when it has _____ valence electrons.
A. 4
B. 8
C. 6
D. 10
Answer:
B. 8
Explanation:
Why is the wavelength of 633 nm used to analyze the standard solutions and drink samples?
Group of answer choices
The lower the wavelength, the blue solutions will absorb more light.
Corresponding with orange light, is the wavelength that blue solutions absorb the most.
Corresponding with blue light, is the wavelength that blue solutions absorb the most.
The higher the wavelength, the blue solutions will absorb more light.
Answer:
Corresponding with orange light, is the wavelength that blue solutions absorb the most.
Explanation:
When light is passed through a solution of a particular color, light of other wavelength or color, is absorbed and disappears, whereas the wavelength of light corresponding to the color of that solution is transmitted. The color of light absorbed the most is that which is complementary (opposite it in the color wheel) to the light which is transmitted. In a color wheel, blue is complementary to orange color, red is complementary to green and yellow is complementary to violet.
Therefore, in a blue substance (as in the blue solutions), there would be a strong absorbance of the complementary color of light, orange. Since the wavelength of orange color of light is between 600 - 640 nm, with maximum absorbance of orange light occurring around 633 nm, the wavelength of 633 nm is used to analyze the standard solutions and drink samples.
Complete and balance each of the following equations for acid-base reactions.
HC2H3O2(aq)+NaOH(aq)→
Answer:
HC2H3O2 + NaOH = H2O + NaC2H3O2 - Chemical Equation Balancer.
Answer:
please check the image :)
2.6
+
3.78
How do you solve this problem
Answer:
6.38
Explanation:
line up the decimals
it helps to add another 0 to 2.6 so that you can align them better
1
2.60
+ 3.78
= 6.38
8 + 0 = 8
6 + 7 = 13; write 3 and carry the one over above the 2 in 2.60
2 + 3 + 1 = 6
I tried my best to show it through text.
What element has the following electron configuration:
1s22s22p63s23p2
If I initially have a gas at a pressure of 10.0 atm, a volume of 24.0 liters, and a temperature
of 200. K, and then I raise the pressure to 14.0 atm and increase the temperature to 300. K,
what is the new volume of the gas?
Answer:
The new volume of gas is 25.7 L.
Explanation:
Given data:
Initial volume = 24.0 L
Initial pressure = 10.0 atm
Initial temperature = 200 K
Final temperature = 300 K
Final volume = ?
Final pressure = 14.0 atm
Formula:
P₁V₁/T₁ = P₂V₂/T₂
P₁ = Initial pressure
V₁ = Initial volume
T₁ = Initial temperature
P₂ = Final pressure
V₂ = Final volume
T₂ = Final temperature
Solution:
V₂ = P₁V₁ T₂/ T₁ P₂
V₂ = 10.0 atm × 24.0 L × 300K / 200 K × 14.0 atm
V₂ = 72000 atm .L. K / 2800 K.atm
V₂ = 25.7 L
The new volume of gas is 25.7 L.
ILL IBE BRAINLY Asian Tsunami 2004:
2. In decomposition, how are other parts of the ecosystem affected?
3. Under which type of change would more organisms be able to survive? Why?
4. What are some positive effects of a rapid change to an ecosystem?
5. What are some positive effects of a slow change to an ecosystem?
J.J. Thomson discovered the electron in 1897. In 1904, he proposed a model of an atom, describing that there was an equal distribution of negative and positive charges throughout the atom. In 1909, Ernest Rutherford tested J.J. Thomson’s model by shooting positive particles at gold foil. Based on Thomson's model, it was predicted that the particles would fly through the foil with a small amount deflected back. Analyzing the results, Rutherford discovered that more of the particles bounced back than expected. Which of the following best explains how the results of Rutherford’s experiment affected Thomson’s widely-accepted atomic model?
A. Rutherford’s results were invalidated and discarded because Thomson’s model was correct.
B. Rutherford’s results supported parts of Thomson's model, but also provided new data and interpretations.
C. Rutherford’s results suggested that the model proposed by Thomson was based on false research and required a change in his hypothesis.
D. Rutherford’s results supported Thomson’s model that there was a negative core surrounded by positive charges and caused a modification in the overall atomic theory.
Rutherford's results declined the results of Thomson's model, the correct option is C.
What are Atomic models?Atomic Models are the scientific theories proposed to determine the structure of an atom.
There are mainly 5 theories proposed for atomic models.
1. John Dalton's Atomic Model: An atom is the basic building block of all physical entities in the universe.
2. Plum Pudding Model, created by J.J. Thomson, uses the comparison of plum pudding, where the positive charge is uniformly dispersed throughout and the negative charge is randomly sprinkled on top, to explain how subatomic particles are structured.
3. Rutherford's model: proved the presence of a nucleus.
4.Niel Bohr's model: Arrangement of electrons in shells.
5. Erwin Schrodinger's model is also called as Quantum Model.
In J.J. Thomson's model, the equal distribution of positive and negative charges is proposed while,
Rutherford's theory declines this arrangement and proposes that the positively charged nucleus occupies a very small part and there is empty space in the atom.
So, Rutherford’s results suggested that the model proposed by Thomson was based on false research and required.
To know more about Atomic Models
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Draw the structural formula for CH2CONHCH3 and what its functional group
Answer:
The structural formula of CH2CONHCH3 is attached below -:
and the functional group of CH2CONHCH3 is - Amide
Explanation:
The IUPAC name of CH2CONHCH3 is -: N-methyl ethenamide .
ABOUT AMIDE FUNCTIONAL GROUP -: In organic chemistry, an amide, also known as an organic amide or a carboxamide, is a compound with the general formula RC(= O) NR 'R' where R, R 'and R' represent hydrogen organic groups or atoms. When it is part of the main protein chain, the amide group is referred to as a peptide bond and isopeptide bond when it appears in a side chain, such as asparagine and glutamine in the amino acids.
The structural formula shows the arrangement of atoms and groups in a compound.
A chemical compound is composed of atoms of elements. There are three structures that could be written for a chemical substance. These are;
Empirical formulaMolecular formulaStructural formulaThe structural formula of a compound shows the arrangement of atoms and groups in the compound in space. The structural formula of the compound CH2CONHCH3 has been shown in the image attached. The following functional groups are present in the compound;
AlkyneKetoneAmineLearn more: https://brainly.com/question/946875
which layer of Earth creates a magnetic field and shields us from the Sun's destructive solar wind?
The outer core is the layer of Earth creates a magnetic field and shields us from the Sun's destructive solar wind.
It is called a magnetic field to a space in which magnetic phenomena take place due to the influence of a body with properties of electric charges.
The earth's magnetic field is mainly produced by the electric currents that occur in the outer core, liquid in nature, which is composed of highly conductive cast iron.
As the center of the Earth cools, part of the iron contained in the fluid outer core solidifies and becomes part of the inner core.
The outer core changes its chemical composition and becomes less dense, generating convective currents.
This process, together with the Coriolis effect (product of the Earth's rotation) generates strong helical convection currents that align with the axis of rotation.
The Earth is mostly protected from the solar wind, a stream of energetic charged particles emanating from the Sun, by its magnetic field, which deflects most of the charged particles.
These particles would destroy the ozone layer, which protects the Earth from harmful ultraviolet rays.
Therefore, we can conclude that the outer core is the layer of Earth creates a magnetic field and shields us from the Sun's destructive solar wind.
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If the hydrogen atom emits red, blue-green, blue, and violet light, how many energy levels does it have in the visible region of the spectrum?
A. 3
B. 4
C. 5
D. 6
Answer:
The correct answer is - option B. 4.
Explanation:
The visible spectrum of light emitted by a sample of active or excited hydrogen atoms splits into four wavelengths that are basically four distinct levels of energy in the visible region of the spectrum. There four different wavelengths are 410 nm, 434 nm, 486 nm, and 656 nm.
These shows for colors according to the spectrum and wavelength violet, blue, green, and red, where 656 nm wavelength is most intense on the spectrum.
If a hydrogen atom emits red, blue-green, blue, and violet light, the number of energy levels it has in the visible region of the spectrum is: B. 4
An electromagnetic spectrum can be defined as a range of frequency and wavelength that an electromagnetic wave is distributed (extends).
Generally, the electromagnetic spectrum comprises the following:
Gamma rays.Visible light.Ultraviolet radiation.X-rays.Radio waves.Infrared radiation.When the atom of an element emits a radiation, each color of the radiation represents an energy level within the visible region of the electromagnetic spectrum.
Since the hydrogen atom emitted four colors (red, blue-green, blue, and violet light), it has four (4) energy levels in the visible region of the electromagnetic spectrum.
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The principal quantum number for the outermost electrons in a Cl atom in the ground state is ________.
Answer:
The principal quantum number for the outermost electrons in a Cl atom in the ground state is 3.
Explanation:
By using the Pauling distribution the chlorine atom has an electronic set of [tex]3s1^{2}[/tex]
With n=3 for an orbital S, l = 0 , ml = 0 and ms = ± 1/2
Therefore the final answer is 3
Which carries information by copying an original sound?
Answer:
frequency
Explanation:
i just did it
Answer:
A: analog signal
Explanation:
on edge2021!
How many grams of sodium are in .500 of a mole
Convert mole to gram by multiplying the molar mass of sodium
0.500mol Na x 22.990g = 11.495g of Na
For the reaction 4 K + 2S ⇒2[tex]_{2}[/tex]S, How many atoms of sulfur will react with 52 atoms of K?
Please! Show your work!
Answer:
~26 atoms of sulfur
Explanation:
When working problems involving equations I find it helpful to works through moles because it relates to the coefficients of balanced equation by linear ratio. In other words, convert data to moles, solve by ratio and convert results to desired dimensions. In this case Atoms of Sulfur.
Given: 52 atoms K = 52 atoms/6.02 x 10²³atoms K/mole K = 9.64 x 10⁻²³ mole K atoms.
Using ratios in given equation 4K + 2S => 2K₂S
Says
4 moles K reacts with 2 moles Sulfur, then
8.64 x 10⁻²³ mole K reacts with X moles Sulfur
Set up ratio:
(4 moles K) / (8.64 x 10⁻²³ moles K) = (2 moles S) / X
Solve for X => X = (2 moles S x 8.64 x 10⁻²³ mole K) / 4 mole K = 4.32 x 10⁻²³ mole S used
Converting moles S to atoms S, multiply by Avogadro's Number ...
Atoms S used = 4.32 x 10⁻²³ mole S used x 6.02 x 10²³ Atoms S / mole S
=> 26.0064 Atoms S ≈ 26 Atoms Sulfur used.
Note: This is a reasonable answer in that the balanced equation given indicates that half the number moles S reacts with K. So, one can conclude that half the number of potassium atoms would indicate the number of sulfur atoms needed. test => ¹/₂(52) = 26 atoms S.
What volume of water (in mL) is required to prepare a 3.000 M solution by dissolving 43.83 g of of NaCl.
Select one:
a. 250.0 mL
b. 2500.0 mL
c. 2.50 mL
d. none of these
e. 25.0 mL
Answer:
Option A. 250 mL
Explanation:
From the question given above, the following data were obtained:
Molarity of NaCl = 3 M
Mass of NaCl = 43.83 g
Volume of water =..?
Next, we shall determine the number of mole in 43.83 g of NaCl. This can be obtained as follow:
Mass of NaCl = 43.83 g
Molar mass of NaCl = 23 + 35.5 = 58.5 g/mol
Mole of NaCl =?
Mole = mass/molar mass
Mole of NaCl = 43.83/58.5
Mole of NaCl = 0.749 mole
Next, we shall determine the volume of water required to prepare the solution as follow:
Mole of NaCl = 0.749 mole
Molarity of NaCl = 3 M
Volume of water =..?
Molarity = mole /Volume
3 = 0.749 /volume
Cross multiply
3 × volume = 0.749
Divide both side by 3
Volume = 0.749/3
Volume = 0.25 L
Finally, we shall convert 0.25 L to millilitres (mL). This can be obtained as follow:
Recall:
1 L = 1000 mL
Therefore,
0.25 L = 0.25 L × 1000 mL / 1 L
0.25 L = 250 mL
Therefore, 0.25 L is equivalent to 250 mL.
Thus, the volume of water needed to prepare the solution is 250 mL
What is the wavelength of an electromagnetic wave that travels at 3.0 x 10^8m/s and has a frequency of 5.43 x 10^-12Hz?
Answer:
frequency f = velocity of light (c)/wavelength
therefore, wavelength =
velocity of light /frequency
= 3 x 10^8/ 5.43 x 10^-12
= 0.552 x 10^20.
HOPE IT HELPS
Recall that you have about 5 L of blood in your body. Your kidneys filter your entire blood volume every 5 minutes which means you kidneys filter 2000 L of blood a day. How many times did your entire blood volume go through your kidneys?
Compare Solution X to Solution A, Solution B, and Solution C. Beaker with a zoom view showing eight shperes, four groups of particles each consisting of two differently colored spheres. Beaker with a zoom view showing four spheres of a single color Beaker with a zoom view showing eight spheres of a single color Beaker with a zoom view showing eight shperes, two groups of particles each consisting of four spheres, three of one color and one of a different color. Which of the solutions have the same molar concentration as Solution X? C
Answer:
SOLUTION A
Explanation:
Molarity is one of the most common measure of concentration
The correct option that gives the solution that has the same molar concentration as solution X is the option;
Solution A
Reason:
The descriptions of the content or each beaker are;
Content of beaker X = Eight spheres of four groups of two differently colored spheres
Content of beaker with solution A = Four spheres of a single color
Content of beaker with solution B = Eight spheres of a single color
Content of beaker with solution C = Eight spheres in two groups of four having three spheres of one color and one sphere of a different color
The concentration of a solution given by the molarity is defined as the number of moles per liter of the solution
A mole is a quantity of matter that contains 6.023 × 10²² elementary particles
Considering each group of spheres as representing one mole of a substance, we have;
Beaker with solution X contains, Four moles containing two elements each, per volume of the solution, such as HClBeaker with solution A contains, four moles of a single (one) element compound per volume of the solutionBeaker with solution B contains, eight moles of a compound having one element eachBeaker with solution C contains, two moles having four elements each, three of one type and one of another element, such as CH₃Therefore, the solution that has the same molar concentration, (the same number of moles per volume of the solution) is solution A
Learn more about molar concentration here:
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Which is the correct name for P205?
O phosphorus dioxide
O phosphorus pentoxide
diphosphorus pentoxidev
diphosphorus hexaoxide
Answer:
Diphosphorus Pentaoxide
Explanation:
We have 2 atoms of Phosphorus and 5 atoms of Oxygen. It is a covalent bond.
2 is Di
5 is penta
Diphosphorus Pentaoxide
Answer:
C. Diphosphorus Pentaoxide
Explanation:
Convert 9.13 decigram into milligram
Answer:
(9.13)
multiply the mass value by 100
=913 milligrams
Answer:
913 mg
Explanation:
913
A tree burns down and forms ashes
Physical or
Chemical
Answer:
It is a chemical change.
Explanation:
A tree burning down would be a chemical change because the composition of the tree is what changes, not just the physical characteristics.
Calculate the density of the football. Use the formula D = m/V where D is the density, m is the mass, and V is the volume. Record your calculations in Table B of your Student Guide. What is the density of the football while it is deflated? g/cm3
Answer:
0.84 g/cm3 EDGE 2020
Explanation:
Answer:
What is the density of the football while it is deflated?
⇒ 0.84 g/cm3
3
Atomic
Atomic
Atomic
ons, an...
Protons
Neutrons Electrons
symbol
number
mass
TABLE...
lack to ...
B
6
11
24
31
37
39
89
Answer:
CCCCCCCCCCCCCCCCCCCC THATS THE ANSWER
Explanation:
How many oxygen atoms are in H2SO4?
What will happen when the valve between a 2.00-L bulb, in which the gas pressure is 2.00 atm, and a 3.00-L bulb, in which the gas pressure is 4.50 atm, is opened? Assume the temperature remains constant. (For this question, label each statement as True or False and give an explanation/justification for each of your answers to receive credit. No credit is given for only True or False answers with no adequate justification. To receive credit you must provide justification. You may have to give numerical answers followed by verbal explanations. You can use any reasoning that you see fit but be as thorough as possible.)
The two gases will mix and react.
The two gases will remain separate and will not mix.
The two gases will occupy a volume of 5.0 L and the final pressure in the two bulbs will be 6.50 atm.
The two gases will occupy a volume of 5.0 L and the final pressure in the two bulbs will be 3.50 atm.
The two gases will occupy a volume of 5.0 L and the final pressure in the two bulbs will be 3.25 atm.
Answer:
- The two gases will mix and react.: FALSE.
- The two gases will remain separate and will not mix: FALSE.
- The two gases will occupy a volume of 5.0 L and the final pressure in the -two bulbs will be 6.50 atm.: FALSE.
- The two gases will occupy a volume of 5.0 L and the final pressure in the two bulbs will be 3.50 atm.: TRUE.
- The two gases will occupy a volume of 5.0 L and the final pressure in the two bulbs will be 3.25 atm: FALSE.
Explanation:
Hello.
In this case, given the options, since the total volume of the container includes the both of them, we find that:
- The two gases will mix and react: FALSE, since we do not know the identity of the gases which could be the same or two different inert gases.
- The two gases will remain separate and will not mix: FALSE, since as the valve is opened, the total gas will occupy the entire volume as the volume of a gas is the same to the container based on its constant molecules movements.
- The two gases will occupy a volume of 5.0 L and the final pressure in the two bulbs will be 6.50 atm: FALSE, since in this case, by using the Boyle's law for the first compartment we obtain the pressure of the gas there:
[tex]P_2V_2=P_1V_1\\\\P_2=\frac{P_1V_1}{V_2} =\frac{2.00atm*2.00L}{5.00L} =0.8atm[/tex]
Now, we reuse it for the gas at the 3.00-L bulb to find its final pressure:
[tex]P_2V_2=P_1V_1\\\\P_2=\frac{P_1V_1}{V_2} =\frac{2.00atm*3.00L}{5.00L} =2.7atm[/tex]
So the final pressure is:
[tex]P_{TOTAL}=0.8atm+2.7atm\\\\P_{TOTAL}=3.5atm[/tex]
- The two gases will occupy a volume of 5.0 L and the final pressure in the two bulbs will be 3.50 atm: TRUE considering the total pressure computed above.
- The two gases will occupy a volume of 5.0 L and the final pressure in the two bulbs will be 3.25 atm: FALSE since the final pressure is 3.5 atm.
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