Answer:
in Crystalline solids
Explanation:
Tell how many atoms of each element are in one molecule of the substance of table salt
Answer:
Explanation:
Then, multiply the number of moles of Na by the conversion factor 6.02214179×1023 atoms Na/ 1 mol Na, with 6.02214179×1023 atoms being the number of atoms in one mole of Na (Avogadro's constant), which then allows the cancelation of moles, leaving the number of atoms of Na.Aug 15, 2020
When two hydrogen nuclei combine to form one helium nucleus, nuclear fusion has taken place. true or false??
please help i need to know asap!
Answer:
sorry im just doin it for the points but i rlly dont know
Explanation:
After assembling a gravity filtration apparatus, begin the separation of a mixture by_____it into the filter paper. Pour the entire contents of the mixture into the filter paper, ______the solid in the filter paper if needed to speed up the filtration. After all the liquid has drained through the filter paper, finish by rinsing the solid with_____.
Answer:
decanting
stirring
solvent
Explanation:
Gravity filtration consists of a pump and a filter (to be placed outside the basin, above the water level). The pump is placed in the water. Connected by a hose to the filter, water is sucked up to the device.
In the gravity-type configuration, water is sucked into the filter, which causes an imbalance between the levels of the basin and the filter: this imbalance causes the movement of water - with the dirt - from the basin to the filter via the main drain and the skimmer.
The fill in the blanks with decanting, stirring, and solvent
Gravity filtration:It comprises of a pump & a filter.The pump should be placed in the water. In the gravity-type configuration, water could be into the filter, which resulted an imbalance between the levels of the basin and the filter: this imbalance causes the movement of water.
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Help and explain step by step if you can!
Answer:
the third one
Explanation:
if you look at it mathematically its the one that makes the most sense
Determine whether each of these reactions occur through an SN1 , SN2 , E1, or E2 mechanism. A. A cyclohexane ring with a bromine substituent is treated with sodium tert butoxide in tert butanol. The product is cyclohexene and sodium bromide. A. The mechanism of Reaction A is: SN1 SN2 E1 E2
Answer:
E2
Explanation:
We can generally regard the bromocyclohexane as having a secondary carbon atom to Which the bromine atom is attached.
Tert-butoxide in tert-butanol favours the formation of an alkene (elimination) leading to the predominance of the less substituted alkene.
Generally, bulky bases such as tert-butoxide favours elimination by E2 mechanism over substitution.
The mechanism of Reaction A is E2 and also mechanism over substitution.
What is Bromine substituent?
We can generally regard the Bromo cyclohexane as maintaining a secondary carbon atom to Which the bromine atom is connected.
Tert-butoxide in tert-butanol prefers the formation of an alkene (elimination) leading to the predominance of the undersized substituted alkene. Therefore, Commonly, bulky bases such as tert-butoxide favors elimination by the E2 mechanism over substitution.
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In addition to specialized glassware and tools, there are several other considerations required for the setup of a distillation apparatus.
Before assembling a distillation apparatus, lubricate the ground glass joints of each piece of glassware using _______. This helps seal the connection between two components. Once two components are fit together, use ________ to make the connections secure. Stabilize the complete distillation setup using a _______.
Answer: Grease; Clamp; Ring stand.
Explanation:
Distillation is being used while separating liquids from the nonvolatile solids, or in instance whereby there is a different boiling point between two or more liquids.
Before assembling a distillation apparatus, lubricate the ground glass joints of each piece of glassware using grease. This will help in lubricating the glass joints so that it won't squeeze out while under pressure.
This helps seal the connection between two components. Once two components are fit together, use clamp to make the connections secure. Clamp is a fastening device which will help in holding the components together so that they won't be separated.
Stabilize the complete distillation setup using a ring stand. The ring stand will help in the provision of support to the glassware.
How many valence electrons do the halogens have?
A. 8
B. 6
C. 7
D. 2
An igneous rock floats because air bubbles became trapped when molten material erupted from an underground volcano.
How else can this rock be accurately described?
intrusive
extrusive
large crystals
coarse texture
Answer:
D coarse texture
Explanation:
An igneous rock floats because air bubbles became trapped when molten material erupted from an underground volcano. This rock can be accurately described as extrusive and the correct option is option 2.
What are igneous rocks?Igneous rocks (from the Latin word for fire) form when hot, molten rock crystallizes and solidifies. The melt originates deep within the Earth near active plate boundaries or hot spots, then rises toward the surface. Igneous rocks are divided into two groups, intrusive or extrusive, depending upon where the molten rock solidifies.
Igneous rocks can be easily identified with their texture, density, colour, and mineral composition. Its texture depends on the shape, size, time period to cool down and solidify, and the arrangement of crystals in the rock.
Therefore, an igneous rock floats because air bubbles became trapped when molten material erupted from an underground volcano. This rock can be accurately described as extrusive and the correct option is option 2.
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Identify the term that applies to each definition.
A. A sample prepared using the solvent and any other chemicals in the sample solutions, but not the absorbing substance
B. A square-shaped container, typically made of quartz, designed to hold samples in a spectrophotometer
C. A measurement of the amount of light that passes through a sample
D. A measurement of the amount of light taken in by a sample
E. A unit commonly used in spectrophotometry that is inversely proportional to energy and commonly measured in nanometers
Answer:
A. Reference blank
B. Cuvettes
C. Transmittance
D. Absorbance
E. Wavelength
Explanation:
A reference blank is a sample prepared using the solvent and any other chemicals in the sample solutions, but not the absorbing substance.
A square-shaped container, typically made of quartz, designed to hold samples in a spectrophotometer is known as Cuvettes.
A measurement of the amount of light that passes through a sample or percentage of light transmitted by the sample, with the respective intensities of the incident and transmitted beams is called Transmittance.
The measurement of the amount of light taken in by a sample is known as Absorbance
The wavelength is also the distance travelled by the wave during a period of oscillation. In spectrophotometry, the unit is inversely proportional to energy and commonly measured in nanometers
The sample that is prepared using the solvent and any other chemicals in the sample solutions, but not the absorbing substance is a reference blank.
A square-shaped container, typically made of quartz, designed to hold samples in a spectrophotometer is the cuvettes.
A measurement of the amount of light that passes through a sample is transmittance.
A measurement of the amount of light that is taken in by a sample is referred to as absorbance.
A unit that is commonly used in spectrophotometry that is inversely proportional to energy and commonly measured in nanometers is the wavelength.
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Ms. Lewis is a chemist micing two solutions together. A chemical reaction takes place, and the solution becomes warm. Which statement best describes what has happened?
O Energy has been created in the form of thermal energy.
O Energy has been transformed from one form to another
More energy has been created than has been destroyed.
a The chemical energy of the solution has been destroyed.
Answer:
It would have to tp be "Energy is being transformed from one form to another".
Explanation:
The reason I know this is because energy can neither be created nor destroyed only transformed into new forms.
Answer:
Energy has been transferred from one form to another.
Explanation:
got it right
2. A shopper in a supermarket takes a box of sugar from a shelf that is 1.5 m high because he is
going to bake some muffins. He also needs to get some blueberries. The sugar has a weight of 5N.
What Potential Energy did the sugar have before it was taken from the shelf?
Explanation:
kinetic energy?? idek hope I helped in anyway possible
Answer:
7.5 joules also 7.5 J
Explanation:
What are the most familiar polyatomic cations?
ammonium, sulfate, phosphate, nitrate
Determine the percentage of calcium in Ca3(PO3)2.
Answer:
[tex]\%Ca=38.76\%[/tex]
Explanation:
Hello.
In this case, since percent compositions are computed by knowing the number of atoms of the required atom, its atomic mass and the molar mass of the compound at which it is, thus, for calcium we have:
[tex]\%Ca=\frac{3*m_{Ca}}{M_{Ca_3(PO_4)_2}} *100\%[/tex]
Thus, since calcium weights 40.08 g/mol and calcium phosphate 310.2 g/mol, the by mass percent of calcium turns out:
[tex]\%Ca=\frac{3*40.08g/mol}{310.2g/mol} *100\%\\\\\%Ca=38.76\%[/tex]
Best regards!
what is z=9x-y solve for x
which statement about the sun is true?
A.The sun is a red giant
B. The sun will become a red giant
C. The sun began as a red giant
D. The sun cannnot become a reg giant
If you are 5 foot 10 inches, how tall are you in meters? Meters ( write you answer 4 significant figures e.g. 2.852)
How many atoms are in 5.80 moles of He
Answer:
5.80 mol He 6.02210^23 atoms He/ 1 mol He. This cancels out moles, leaving 3.49*10^24 atoms He. Mass is used as a method of counting atoms.
The number of atoms in 5.80 moles of He is equal to 3.49 × 10²⁴ atoms.
What is Avogadro's number?Avogadro’s number is used to represent the number of entities in one mole of any substance. Generally, these entities are ions, molecules, atoms, electrons, or protons, depending upon the type of reaction or reactant and product.
The value of Avogadro’s constant is found approximately 6.022 × 10²³ mol⁻¹. This number was named after the scientist Amedeo Avogadro after his death.
Given, the number of moles of helium = 5.80
The number of atoms in one mole of He = 6.022 × 10²³
The number of atoms on 5.80 moles of He = 5.80 × 6.022 × 10²³
Total number of atoms = 3.49 × 10²⁴
Therefore, the number of atoms in 5.80 moles of Helium is 3.49 × 10²⁴ He atoms.
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Balance : Fe2O3 + Zn = Fe+ZnO
Answer:
Fe₂O₃ + 3Zn → 2Fe + 3ZnO
Explanation:
Step 1: RxN
Fe₂O₃ + Zn → Fe + ZnO
Step 2: Balance RxN
We need 2 Fe's on both sides.
We also need 3 O's on both sides.
If we multiply ZnO by 3, we will need 3 Zn's as wellFe₂O₃ + 3Zn → 2Fe + 3ZnO
what formation is the result of wind erostion
Answer:
Wind erosion abrades surfaces and makes desert pavement, ventifacts, and desert varnish. Sand dunes are common wind deposits that come in different shapes, depending on winds and sand availability.
In x-ray studies of crystalline peptides, Linus Pauling and Robert Corey found that the C—N bond in the peptide link is intermediate in length (1.32 Å) between a typical C—N single bond (1.49 Å) and a C=N double bond (1.27 Å). They also found that the peptide bond is planar (all four atoms attached to the C—N group are located in the same plane) and that the two α-carbon atoms attached to the C—N are always trans to each other (on opposite sides of the peptide bond).
Required:
a. What does the length of the C—N bond in the peptide linkage indicate about its strength and its bond order (i.e., whether it is single, double, or triple)?
b. What do the observations of Pauling and Corey tell us about the ease of rotation about the C—N peptide bond?
Answer:
The C-N bond is a double bond.
There is no free rotation about the C-N bond
Explanation:
Linus Pauling and Robert Corey carried out a painstaking study of the bond lengths of peptide bonds as well as the stereo chemistry of atoms and groups around the peptide bonds in the crystal structures of molecules containing one or a few peptide bonds.
Their findings indicate that the bond length of the C-N bond in crystalline peptides is intermediate in length (1.32 Å) between a typical C—N single bond (1.49 Å) and a C=N double bond (1.27 Å). This is because the peptide bond has some double bond character as a result of resonance involving the C=O and -NH moieties of the amide.
As a result of resonance as shown above, the peptide bonds are found to be planar hence free rotation about the C-N bond is hindered. The peptide bond is mostly found in the trans configuration because it is more energetically favourable than the cis configuration.
Summarily, owing to the existence of a partial double bond character between the α carbon and the amine nitrogen in the peptide, there is no free rotation around the C-N bond.
Given the image below, which calculation will NOT give you the correct average atomic mas C-12 C-13 (0.6.12)+0.4.13) (60-12)+40-13) (12+12+12-12-12+12+13+13+13+13)/10 16/10) 12+(4/10) 13
Answer:
Correct Answer: B. (60⋅12)+(40⋅13)
Explanation:
Bisulfite ion
What’s its ion pleaseeee helpppp meee
Answer:
An ester of sulfuric acid in which only one sulfuric acid hydroxyl group has been esterified. The product of esterification of both sulfuric acid hydroxyl groups is a sulfate ester.
WHAT IS THE MASS OF AN OBJECT WHOSE
DENSITY IS 0.23 G/ML AND A VOLUME OF
22.5 ML?
Answer:
The answer is 5.18 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
volume = 22.5 mL
density = 0.23 g/mL
We have
mass = 0.23 × 22.5 = 5.175
We have the final answer as
5.18 gHope this helps you
Which object has the least kinetic energy? A. a heavy bowling ball moving quickly B. a heavy bowling ball moving slowly C. a light ping-pong ball moving quickly D. a light ping-pong ball moving slowly
Answer:
B
Explanation:
Answer:
kisses
Explanation:
mwah
What is the change of an atom of one element (atom) to an atom of different element called?
You weigh a dry flask, and place a chunk of solid into it, then weigh it again. You then fill the flask to the top with water and weigh the full flask. Finally, you take the solid out, fill the flask to the top with water and weigh it once more.
Density of water at 20 C = .9982Density of water at 35 C = .9941
Mass of flask is 58.33(g)
Mass of flask plus solid 135.95(g)
Mass of flask plus solid and water 143.04(g)
Mass of flask filled with water 83.27(g)
Calculate the following:
1) Density of water at the measured water temperature at 0.991(g/cc).
2) The mass of the solid in (g).3) The volume of the flask in (cc).
4) Volume of the flask (not occupied by the solid) in (cc).
5) The volume of the solid in (cc).6) Density of the solid unknown in (g/cc).
Answer:
1) 0.9972 g/cm³.
2) 77.62 g.
3) 25.01 cm³.
4) 7.11 cm³
5) 17.9 cm³.
6) 4.34 g/cm³
Explanation:
Hello.
In this case, for this gravimetry problem, we proceed as follows:
1) Since the temperature is 23.75 °C the density computed via lineal interpolation is:
[tex]\rho=1.004g/cm^3+23.75\°C*-0.000273\frac{g/cm^3}{\°C} =0.9972g/cm^3[/tex]
2) The mass of the solid is computed via the mass of the empty flask and the mass of the flask with the solid:
[tex]m_{solid}=135.95g-58.33g\\\\m_{solid}=77.62g[/tex]
3) In this case, since the volume of the flask equals the volume of the flask and the water because the volume of liquid water equals the volume of the container at which it is, we compute the volume of the flask considering both the mass and density of water:
[tex]m_{water}=83.27g-58.33g=24.94g\\\\V_{water}=\frac{24.94g}{0.9972g/cm^3}\\ \\V_{water}=25.01cm^3[/tex]
Thus, the volume of the flask is 25.0 cm³.
4) Here, we compute the volume of water when the water and the solid are inside the flask:
[tex]m_{water}=143.04g-135.95g=7.09g\\\\V_{water}=\frac{7.09g}{0.9972g/cm^3} =7.11cm^3[/tex]
Thus, the volume of the flask not occupied by the solid which corresponds to the water is 7.11 cm³.
5) Considering the previous volume of the flask, the volume of the solid is:
[tex]V_{solid}=25.01 cm^3-7.11cm^3\\\\V_{solid}=17.9cm^3[/tex]
6) Finally, the density of the solid is:
[tex]\rho _{solid}=\frac{77.62g}{17.9cm^3}\\ \\\rho _{solid}=4.34g/cm^3[/tex]
Regards.
The motion of atomic or sub-atomic objects deal with
Answer:
quantum mechanics
Explanation:
household items that are substances
Answer:
water,salt are the house hold items
Control of Blood pH by respiratory rate.
A) The partial pressure of CO2 in the lungs can be varied rapidly by the rate and depth of breathing. For example, a common remedy to alleviate hiccups is to increase the concentration of CO2 in the lungs. This can be achieved by holding one’s breath, by very slow and shallow breathing (hypoventilation), or by breathing in and out of a paper bag. Under such conditions, pCO2 in the air space of the lungs rises above normal. Qualitatively explain the effect of these procedures on the blood pH.
B) A common practice of competitive short-distance runners is to breathe rapidly and deeply (hyperventilate) for about half a minute to remove CO2 from their lungs just before the race begins. Blood pH may rise to 7.60. Explain why the blood pH increases.
C) During a short-distance run, the muscles produce a large amount of lactic acid (CH2CH(OH)COOH; K2 = 1.38 × 10–4M) from their glucose stores. Why might hyperventilation before a dash be useful?
Answer:
A) During this procedure ( hypoventilation ) The CO2 in the arterial blood vessels and the lungs increases and this drives the PH level in the system lower, and the equilibrium will shift to the right. this is because the Blood-PH level is controlled by CO2 - bicarbonate buffer system
B) The blood PH may rise to 7.60 during Hyperventilation because the removal of CO2 from the lungs causes the increase in [tex]H^+[/tex] which is directly proportional to the increase in Blood PH levels
C) Hyper ventilation before a dash would be useful because it will remove excessive Hydrogen ions and and raise the Blood PH levels in preparedness of the production of acids like Lactic acid
Explanation:
A) During this procedure ( hypoventilation ) The CO2 in the arterial blood vessels and the lungs increases and this drives the PH level in the system lower, and the equilibrium will shift to the right. this is because the Blood-PH level is controlled by CO2 - bicarbonate buffer system
[tex]CO_{2} +H_{2} O[/tex] ⇄ [tex]H^+ + HCO^-_{3}[/tex]
B) The blood PH may rise to 7.60 during Hyperventilation because the removal of CO2 from the lungs causes the increase in [tex]H^+[/tex] which is directly proportional to the increase in Blood PH levels
C) Hyper ventilation before a dash would be useful because it will remove excessive Hydrogen ions and and raise the Blood PH levels in preparedness of the production of acids like Lactic acid
At a certain temperature the rate of this reaction is first order in with a rate constant of : Suppose a vessel contains at a concentration of . Calculate the concentration of in the vessel seconds later. You may assume no other reaction is important. Round your answer to significant digits.
Complete question is;
Consider this reaction: 2 HI(g) ⇄ H₂(g) + I₂(g)
At a certain temperature, this reaction follows first - order kinetics with a rate constant of 0.684 s^(-1). Suppose a vessel contains HI at a concentration of 0.32 M. Calculate the concentration of HI in the vessel 0.88 seconds later.
You may assume no other reaction is important.
Round your answer to 2 significant digits
Answer:
0.18 M
Explanation:
We are given;
Initial concentration of HI = 0.32 M
Time = 0.88 s
Rate is given as 0.684 s^(-1)
Now, we want to find the concentration of HI in the vessel 0.88 seconds later. It can be gotten from the formula;
ln (HI) = ln (HI)₀ - (kt)
Where;
(HI)₀ is the initial concentration
k is the reaction rate constant
t is time
Plugging in the relevant values, we have;
ln (HI) = In (0.32) - (0.684 × 0.88)
ln (HI) = -1.1394 - 0.6019
ln (HI) = -1.7413
(HI) = e^(-1.7413)
(HI) = 0.175 M ≈ 0.18 M