Answer:
B. An organized way to test scientific ideas.
Determine the electron-group arrangement, molecular shape, and ideal bond angle(s) for each of the following:
(a) SO3
(b) N2O (N is central)
(c) CH2C12
Solution :
a). [tex]$SO_3$[/tex]
This compound is known as sulfur trioxide.
The molecular shape of sulfur trioxide is trigonal planer.
And the bond angle is 120°.
b). [tex]$N_2O$[/tex]
This compound is known as Nitrous oxide. Here, nitrogen is in the center. There is no lone pair around the nitrogen atom and it forms two sigma bonds with the other two atoms.
It is linear in shape.
The bond angle between them is 180°.
c). [tex]$CH_2Cl_{2}$[/tex]
This compound is known as the Dichloromethane.
The molecular shape of the compound is tetrahedral.
The bond angles is 120°
Bella observes that the gas-filled tire of her bicycle becomes a little deflated when
she keeps the bicycle outside in cold weather. Which of the following laws is used to
understand the behavior of the gas and why? (5 points)
The low temperature outside lowers the volume of the gas according to
1)
Charles's law because this law describes how a gas will behave at constant
pressure.
2)
The low temperature outside increases the volume of the gas according to
Charles's law because this law describes how a gas will behave at constant
pressure.
3)
The low temperature outside lowers the volume of the gas according to
Boyle's law because this law describes how a gas will behave when the
number of moles remains constant.
The low temperature outside increases the volume of the gas according to
4)
Boyle's law because this law describes how a gas will behave when the
number of moles remains constant.
Answer:
Answer is A - The low temperature outside lowers the volume of the gas according to Charles's law because this law describes how a gas will behave at constant pressure.
Explanation:
The low temperature outside lowers the volume of the gas according to Charles's law because this law describes how a gas will behave at constant pressure.
What is Charles law?Charles states that, the volume of aa given mass of gas is directly proportional to its temperature at constant pressure.
Hence, to understand this behavior of the gas, we must understand that the low temperature outside lowers the volume of the gas according to Charles's law because this law describes how a gas will behave at constant pressure.
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Which element has the most energy levels?
Cs
Li
Mg
S
Answer:
I think Cs
Explanation:
because it has 6 energy levels
Find the percent composition for SF6
S =? %
F =? %
Answer:
S = 21.92 %
F = 78.08 %
Explanation:
To find the percent composition of each element in SF6, we must find the molar mass of SF6 first.
Molar mass of SF6 = 32 + 19(6)
= 32 + 114
= 146g/mol
mass of Sulphur (S) in SF6 = 32g
mass of Fluorine (F) in SF6 = 114g
Percent composition = mass of element/molar mass of compound × 100
- % composition of S = 32/146 × 100 = 21.92%.
- % composition of F = 114/146 × 100 = 78.08%.
How many atoms of copper (Cu) are in 4 moles of copper?
Answer:
i moles of copper has 6.022 multiplied by 10raseto 23
Explanation:
Please help! Will give brainiest for best answer! Please Explain how you got there as well. Thanks.
1. a) Write the word equation for the reaction of barium nitride with potassium.
2. b) Write the balanced formula equation for this reaction.
3. c) If 21.0 g of potassium reacts with 62.5 g of barium nitride, what mass of potassium nitride will
be produced?
4. d) Identify which reactant is the limiting reactant and which is the excess reactant.
5. e) How many grams of the excess reactant reacts and how many grams are left over?
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it's in order and the answer is also there, just read it thanks ☜(^o^☜()
Somebody please answer
A sample of gas at 500 mm Hg inside a steel tank is cooled from 773 K to 273 K. What is the final pressure of the gas in the steel tank?
Answer:
177 mmHg
Explanation:
Given that:
The sample of a gas is with Pressure (1) [tex]P_1[/tex] = 500 mmHg
The initial temperature [tex]T_1[/tex] = 773 K
The final temperature [tex]T_2[/tex] = 273 K
Using ideal gas equation:
[tex]\dfrac{P_1}{T_1} = \dfrac{P_2}{T_2} \\ \\ \dfrac{500}{773} = \dfrac{P_2}{273} \\ \\ (136500) = 773 \times P_2 \\ \\ P_2 = \dfrac{136500}{773} \\ \\ P_2 = 176.58 \ mmHg \\ \\ \simeq 177 mmHg[/tex]
Label the states of each compound in the reaction below.
CuSO4( ) + 2KOHC ) + Cu(OH)2( ) + K2SO4( )
Answer:
CuSO₄(aq) + 2KOH (aq) —> Cu(OH)₂(s) + K₂SO₄(aq)
Explanation:
CuSO₄ + 2KOH —> Cu(OH)₂ + K₂SO₄
To know the state of each compounds, we shall determine the complete ionic equation. This can be obtained as follow:
In solution, CuSO₄ and KOH will dissociate as follow:
CuSO₄(aq) —> Cu²⁺(aq) + SO₄²¯(aq)
KOH (aq) —> K⁺ (aq) + OH¯(aq)
CuSO₄(aq) + KOH (aq) —>
Cu²⁺(aq) + SO₄²¯(aq) + 2K⁺(aq) + 2OH¯(aq) —> Cu(OH)₂(s) + 2K⁺(aq) + SO₄²¯(aq)
Note: Cu(OH)₂ is insoluble in water.
Therefore, the elemental equation is:
CuSO₄(aq) + 2KOH (aq) —> Cu(OH)₂(s) + K₂SO₄(aq)
QUESTION 57 Select the diamagnetic ion.
A. Ni2+ B. Cu2+ C. Sr2+ D. Cr3+
Answer:
c
Explanation:
Which element has the largest nuclear charge?
Cs
Li
Mg
S
Answer:
Mg
Explanation:
I think Mg is correct not too sure tho
Determine the resulting pH when 75 mL of 0.05M HBr is reacted with 74 mL of 0.075 M KOH
Answer:
pH = 12.08
Explanation:
H⁺ + OH⁻ → H₂OFirst we calculate how many moles of each substance were added, using the given volume and concentration:
HBr ⇒ 0.05 M * 75 mL = 3.75 mmol HBrKOH ⇒ 0.075 M * 74 mL = 5.55 mmol KOHAs HBr is a strong acid, it dissociates completely into H⁺ and Br⁻ species. Conversely, KOH dissociates completely into OH⁻ and K⁺ species.
As there are more OH⁻ moles than H⁺ moles (5.55 vs 3.75), we calculate how many OH⁻ moles remain after the reaction:
5.55 - 3.75 = 1.8 mmoles OH⁻With that number of moles and the volume of the mixture, we calculate [OH⁻]:
[OH⁻] = 1.8 mmol / (75 mL + 74 mL) = 0.0121 MWith [OH⁻], we calculate the pOH:
pOH = -log[OH⁻] = 1.92With the pOH, we calculate the pH:
pH = 14 - pOHpH = 12.08What story does Ms. McDermid share about maggots helping identify a dead man?
Answer:
The maggots had traces of this man in them and the entomologists found out who he was just by using the DNA in the maggots.
Explanation:
Answer:
She shares how there were maggots found in an empty house and found cocaine on them. By this, they knew that the maggots had been feeding off human remains. They were then able to run more tests and find DNA that were on these maggots and they were able to discover who the victim was.
A gas container has a volume of 446.9 with a temp of 14c. When the volume is decreased to 238.7l the new temp is what
Answer:
[tex] \frac{V _{1}}{T _{1}} = \frac{V _{2}}{T _{2} } \\ \frac{446.9}{(14 + 273)} = \frac{238.7}{T _{2} } \\ {T _{2}} = \frac{238.7 \times 287}{446.9} \\ {T _{2}} = 153.3 \: kelvin \\ = 119.7 \degree \: c[/tex]
Brainliest get's +30 Points!
Answer:
Yesssssss , option two is the correct one click it buddy
Explanation:
A sample of NH3 contains 10.0 grams of nitrogen and 25.00 grams of oxygen. Find its percent composition.
N= 0=
Answer:
[tex]\%N=28.6\%\\\\\%O=71.4\%[/tex]
Explanation:
Hello there!
In this case, according to the given information, it is possible to calculate the percent compositions, by dividing the mass of each element by the sum of the masses of the elements as shown below:
[tex]\%N=\frac{m_N}{m_N+m_O} *100\%\\\\\%O=\frac{m_O}{m_N+m_O}*100\%[/tex]
Thus, we plug in the given masses to obtain:
[tex]\%N=\frac{10.0g}{10.0g+25.00g} *100\%=28.6\%\\\\\%O=\frac{25.00g}{10.0g+25.00g}*100\% =71.4\%[/tex]
Regards!
Most of the elements in group 1 are classified as
Answer:
alkali metals
Explanation:
:)
Nitrogen dioxide is a red-brown gas that is responsible for the color of photochemical smog. What is the volume of 1 mol of nitrogen dioxide(assumed to be an ideal gas) at STP? O A. 27.6 L O B.22.4L O C. 29.6L O D. 21.8 L
Nitrogen dioxide is a red-brown gas that is responsible for the color of photochemical smog. The volume of the 1 mol of nitrogen will be 22.4 L.
What is volume?The volume that a three-dimensional item or area of space takes up. Cubic units are used to describe volumes. a way to gauge how loud or intense a sound is.
What is photochemical smog?When nitrogen oxides but also volatile organic compounds (VOCs) combine with sunlight, a mixture of pollutants called photochemical smog has been produced, which explains why there is a brown cloud above cities. Due to the fact that we receive the most sunshine in the summer, it tends to happen more frequently. primary contaminates.
It is known that at STP the volume of ideal gas will be 22.4 L. Hence, Nitrogen dioxide is a red-brown gas that is responsible for the color of photochemical smog. The volume of the 1 mol of nitrogen will be 22.4 L.
Therefore, the correct answer will be option (B).
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How many H2O molecules are in 183.2 grams of H20 gas?
Answer: There are [tex]61.24 \times 10^{23}[/tex] molecules present in 183.2 grams of [tex]H_{2}O[/tex] gas.
Explanation:
Given: Mass = 183.2 g
Number of moles is the mass of substance divided by its molar mass.
As molar mass of water is 18 g/mol. Therefore, moles of [tex]H_{2}O[/tex] are calculated as follows.
[tex]Moles = \frac{mass}{molar mass}\\= \frac{183.2 g}{18 g/mol}\\= 10.17 mol[/tex]
According to the mole concept, there are [tex]6.022 \times 10^{22}[/tex] molecules present in one mole of a substance.
Hence, molecules present in 10.17 moles are calculated as follows.
[tex]10.17 mol \times 6.022 \times 10^{23}\\= 61.24 \times 10^{23}[/tex]
Thus, we can conclude that there are [tex]61.24 \times 10^{23}[/tex] molecules present in 183.2 grams of [tex]H_{2}O[/tex] gas.
How many grams does 6.60 x 10^22 molecules of SiO weigh?
Answer:
mass = 6.56 grams
Explanation:
No of molecules = No of moles × Avogadro's constant
Similarly, number of moles = mass/ molar mass
∴
[tex]\text{number of molecules} = \dfrac{mass }{molar mass}}\times avogadro's \ no[/tex]
[tex]6.60*10^{22}}} = \dfrac{mass }{60.0 \ g/mol} \times 6.022 \times 10^{23}[/tex]
[tex]6.60*10^{22}}}\times 60.0 \ g/mol =mass\times 6.022 \times 10^{23}[/tex]
[tex]mass = \dfrac{6.60*10^{22}\times 60.0 \ g/mol}{6.022 \times 10^{23}}[/tex]
mass = 6.56 grams
What information does a molecular formula give?
O A. The actual number of atoms in a molecule
OB. The percent composition of atoms in a molecule
O C. The lowest ratio of atoms in a molecule
O D. The order in which atoms are bonded in a molecule
Answer:
A. The actual number of atoms in a molecule
Explanation:
Molecular formula is simply defined as a type of chemical formula that describes the type and number of atoms present in a single molecule of a compound.
Looking at the options, the correct answer is option A.
Answer:
a
Explanation:
Calculate the ph of a buffer solution that contains 0.25 M benzoic acid (c6h5co2h) and 0.15M sodium benzoate (c6h5coona) . Ka=6.5×10-5
Answer:
4.0
Explanation:
we have a buffer system formed by a weak acid (benzoic acid C₆H₅O₂H) and its conjugate base (benzoate ion C₆H₅O₂⁻, coming from sodium benzoate C₆H₅O₂Na). Given the acid dissociation constant (Ka) for benzoic acid is 6.5 × 10⁻⁵, we can calculate the pH of the buffer solution using the Henderson-Hasselbach equation.
pH =pKa + log [base]/[acid]
pH =-log Ka + log [C₆H₅O₂⁻]/[C₆H₅O₂H]
pH =-log 6.5 × 10⁻⁵ + log (0.15 M/0.25 M) = 4.0
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Answer:
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HELP ASAP CHEM!!!! Please
Answer:
The solubility of gases decreases with pressure as that of solids and liquids is not affected.
how many grams are in 5.32 x 10^22 molecules of CO2?
Answer:
mass = 3.89 g
Explanation:
hope this helps
There are 3.89 grams in 5.32 ×10²² molecules of carbon dioxide.
How to determine number of molecules from weight?Molecule is defined as a substance which is made up two or more atoms which are held together by forces of attraction known as chemical bonds. It may be homo-nuclear as in oxygen where it is composed of same type of atoms or hetero -nuclear as in case of water where the molecule is made up of two different types of atoms.
Number of molecules in a substance can be calculated from the formula mass of substance divided by Avogadro's number and then multiplied by it's molecular weight.
In the given example , number of molecules of carbon dioxide is calculated as, 5.3×10²²/6.022×10²³×44= 3.89 g
Thus, there are 3.89 g molecules of carbon dioxide in 5.32×10²² molecules.
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what is the photo above showing
What is the specific heat of the Orange Juice? How do I find it out?
Use the equation qliquid = m × c × ΔT to calculate the heat gained by the cold liquid. Use the specific heat for the liquid (Orange Juice) you selected.
Answer:
3.89
Explanation:
the specific heat is usually quoted at constant pressure but in some applications where pressure changes it is quoted at quoted at constant volume
How many grams of sodium chloride are in 100 mL of 1.25 M sodium chloride?
Answer:
7.3125grams
Explanation:
Molarity is the measure of the molar concentration of a solution. It can be calculated using the formula as follows:
Molarity = number of moles (n) ÷ volume (V)
Based on the information given,
Molarity = 1.25 M
Volume = 100 mL = 100/1000 = 0.1 L
Molarity = n/V
1.25 = n/0.1
n = 1.25 × 0.1
n = 0.125mol
Using the below formula to calculate the mass of NaCl;
mole = mass/molar mass
Molar mass of NaCl = 23 + 35.5 = 58.5g/mol
0.125 = mass/58.5
mass = 0.125 × 58.5
mass = 7.3125 grams
1. What is the composition
of Ca(No2)2
Answer:
1 Calcium, 2 Nitrogen, and 4 oxygen
Explanation:
there is no number before of after Ca(calcium), so there is only 1. No(nitrogen) has no number next to it so there would be only 1 of it,but there is a 2 after the parenthesis so there is 2 nitrogen (2*1=2). O(oxygen) has a two next to it so there would be only 2 oxygen, but there is a two after the parenthesis so instead there are 4 oxygen because 2*2=4. Hope this helped you <3
A(n) __________ occurs when the moon enters the umbral shadow of the earth without being entirely immersed in it.
partial lunar eclipse
total lunar eclipse
annular eclipse
Answer:
Partial lunar eclipse.
Explanation:
A lunar eclipse is a cosmological event by which, in the presence of the Earth between the Sun and the Moon, the latter does not receive the light of the Sun in the totality of its visible face, with which a part (or the totality ) of her is in the dark.
Thus, if the lunar eclipse implies an absence of sunlight in the entire lunar surface, the eclipse will be total, while if the eclipse implies an absence of light only in part, the eclipse will be partial (which is the most common event).
The main criterion for sigma bond formation is that the two bonded atoms have valence orbitals with lobes that point directly at each other along the line between the two nuclei.
a. True
b. False
Answer:
The given statement - The main criterion for sigma bond formation is that the two bonded atoms have valence orbitals with lobes that point directly at each other along the line between the two nuclei , is True.
Explanation:
The above statement is correct , because the sigma bond is produced by the head on overlapping, the orbitals should all point in the same direction.
SIGMA BONDS - Sigma bonds (bonds) are the strongest type of covalent chemical bond in chemistry. They're made up of atomic orbitals that collide head-on. For diatomic molecules, sigma bonding is best characterized using the language and tools of symmetry groups.
Head-on overlapping of atomic orbitals produces sigma bonds. The concept of sigma bonding is expanded to include bonding interactions where a single lobe of one orbital overlaps with a single lobe of another. Propane, for example, is made up of ten sigma bonds, one for each of the two CC bonds and one for each of the eight CH bonds.
Hence , the answer is true .