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Related Questions
What does an electrostatic force do?
A. An electrostatic force attracts oppositely charged particles.
B. An electrostatic force holds particles together by sharing
electrons.
C. An electrostatic force holds particles of the same charge together.
D. An electrostatic force attracts particles via gravitational pull.
Answers
Answer:
A.
Explanation:
Opposite charged particles attract.
Particles of same charge are repelled.
Answer:
attracts opposites (a)
Explanation:
3. Arrange the following according to increasing acid strength
(i) Ka= 2.5 + 10-15
(ii) Ka= 9.0 + 10-9
(iii) pKa= 7.5
(iv) % dissociation =100
(a) iv, iii, ii, i
(b) ii, I, iii, iv
(c) i, iii, iv, ii
(d) i, ii, iii, iv
(e) iii, iv, ii, i
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Answer:
3. Arrange the following according to increasing acid strength (i) Ka=2.5x 10-10 (ii) Ka=9.0x108 (iii)pKa= 7.5 (iv)% dissociation -100 (a) iv, iii, ii, i (b) ii, 1, iii, iv (c) i, iii, iv, ii (d)i, ii, iii, iv (e) iii, iv, ii, i
5. Consider the buffer NH/NH.Cl. If one wants to prepare 250.0mL of this buffer at pH 4.0. Is it possible to achieve one's sim? (a) yes (b) no 6. If the pH of the buffer in (5) above would be 9.0, the ratio of NH/NH.Cl required for the preparation, considering I Liter of buffer, is (a) 1.80 (b) 0.56 (c) 4.26 (d) 1.82 x 10: (e) K, (NH -1.8x109)
Explanation:
what would you expect to happen if you put a red blood cell in a glass pure water distilled water g
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Please help!
A molecule that is either cycloheptane or cycloheptene is treated with bromine and the sample immediately absorbs the red bromine color—which compound is present?
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The compound that is most likely present when treated with bromine and the sample absorbs the red bromine color is ; Cycloheptene
What is cyclohepteneCycloheptene is an unsaturated colorless oily liquid which is insoluble in water it absorbs Bromine when used in performing unsaturation test due it unsaturated nature.
The red bromine color will be absorbed when used to treat Cycloheptene but will not be absorbed when used to treat cycloheptane due to its saturated nature.
Hence we can conclude that the compound that is present is Cycloheptene.
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what does SPDF Blocks represent on the periodic table?
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Answer:
SPDF blocks represents the last electron of particular element entering into valance subshell.
example: oxygen is p block element because (1s2, 2s2 2p4) its last electron is in p block
A block of the periodic table is unified by the atomic orbitals in which valence electrons lie in.
What is the block in the periodic table?A block can be described as a set of elements in which the valence electrons lie in atomic orbitals. Each block in the periodic table is named after its characteristic orbital: s-block, p-block, d-block, and f-block.
The block names (s, p, d, and f) are derived from the value of an electron's azimuthal quantum number: sharp (0), principal (1), diffuse (2), and fundamental (3).
The s-block, where 's' stands for "sharp" and azimuthal quantum number 0, is on the left side of the periodic table. The p-block, where 'p' stands for "principal" and azimuthal quantum number 1, is on the right side of the modern periodic table and elements in groups 13 to 18.
The d-block, where 'd' stands for "diffuse" and azimuthal quantum number 2, is in the middle of the periodic table and elements from groups 3 to 12.
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Hydrogen has a melting point of -259 °C, and a boiling point of -253 °C. Its density at liquid state is 0.07 g/cm³. What is the physical state of Hydrogen at -250 °C? Explain your answer.
Answers
Answer:
Explanation:
Remark
-250, if you can believe it, is actually warmer than - 253. At -250 the hydrogen has gone through a phase change (a phase change means that it has gone from a liquid to a gas).
From here on as far as you are concerned, the hydrogen will stay as a gas. Later on, if all other things remain constant, you will learn that hydrogen can do some very strange things.
How moles of Cl' are in a 45 mL of 1,4 M solution of NaCl?
Answers
Answer:
.063 moles Cl-
Explanation:
To find moles multiply molarity by volume.
1.4*.045=.063 moles Cl-
Use this equation: N2 + 3H2 → 2NH3, for the following problems:
1. If 2.5 moles of N2 react, how many grams of NH3 can be produced?
2. If 10.0 moles of NH3 are produced, how many grams of H2 would be required?
Use this equation: B2O3 + 3Mg → 3MgO + 2B, for the following problems:
3. How many grams of boron can be obtained from 8 moles of B2O3?
4. How many grams of magnesium are required to produce 4 moles of boron?
Use this equation: S8 + 12O2 → 8SO3, for the following problems:
5. How many grams of oxygen is needed to produce 7.5 moles of sulfur trioxide?
6. How many grams of sulfur trioxide can be produced from 2 moles of octasulfur?
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Answer:hop this helps
Explanation:
The Molar mass of silicon is 28.09 grams/mole
Calculate the number of atoms in a 92.8 mg sample of silicon
Write your answer in scientific notation using three significant figures
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92.8 mg x 1 g/10^3 mg x 1 mol/28.09 g x 6.022x10^23 atoms/1 mol
2. Cancel units.
1.99 x 10^21 Si atoms
Which action would shift this reaction away from solid silver chloride and toward the dissolved ions
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describe the arrangement of the 118 elements in the periodic table how is it arrange?
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Hello, do these calculations using table 1 look correct? Thank you
Table 1.
Sugar (Sucrose) Data
Mass of unchewed gum 3.7 (g)
Mass of chewed gum 2.0 (g)
Mass of sugar 1.7 (g)
Percent sugar
46%
Post-Lab Questions
1. What is the percent sugar? Show your calculations.
mass of sugar (1.7) ÷ mass of unchewed gum ( 3.7) × 100 = 45.94 (46%)
2. What is the molar mass of sugar (sucrose, C12H22O11)? Show your calculations.
C=12×12=144
H=1×22=22
O=16×11=176
To get the molar mass of the entire compound you, 144 + 22 + 176 = 342 g/mol
3. Convert the mass of dissolved sugar to moles. Show your calculations.
1.7 g ÷ 342 g/mol = 0.00497 moles
4. Convert the moles of sugar to molecules of sugar. Show your calculations.
0.00497 mole × 6.022 × 10^23 = 2.992934 × 10^21 molecules
5. Imagine that you used four pieces of gum instead of two. Calculate the number of moles. Show your calculations.
In theory, assuming the sticks of gum were exactly the same mass and sugar content, the moles would double.
2 ÷ 342 g/mol × 1.7 = 0.00994 moles
6. How does the mass of the saliva alter the experimental data?
It is impossible to blot off all the saliva with a paper towel because the gum sticks to the paper, so it adds more mass to the chewed gum and therefore alters the amount and percent of sugar calculations.
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Answer:
yes it does look correct. good job.
Post- lab the percent sugar 46%, and the molar mass of sugar is 342 g/mol, the mass of dissolved sugar to moles is 0.00497 moles of sugar to molecules of sugar is 2.992934 × 10^21 molecules, assuming the sticks of gum were exactly the same mass and sugar content, the moles would double 0.00994 moles.
What are moles?moles is the unit of the molecule and it is defined as the number of molecules participating in a chemical reaction and value of one mole is equal to Avogadro constant that is 2.303 × 10²³
Sugar percentage = mass of sugar / mass of gum × 100 = 1.7 / 3.7 × 100 = 45.94 (46%)
Molar mass of sugar = C12H22O11 = C=12×12=144 + H=1×22=22 + O=16×11=176 = 342 g/mol
Mass of dissolved sugar to moles = 1.7 g ÷ 342 g/mol = 0.00497 moles
The moles of sugar to molecules of sugar = 0.00497 mole × 6.022 × 10^23 = 2.992934 × 10^21 moleculesIn the given theory using four pieces of gum will exactly be the same to the mass of sugar.2 ÷ 342 g/mol × 1.7 = 0.00994 moles
The mass of the saliva alter the experimental data because it is not possible to remove all the saliva from the surface as it gets stick to the paper which changes the amount of sugar.
Therefore, the percent sugar 46%, and the molar mass of sugar is 342 g/mol, the mass of dissolved sugar to moles is 0.00497 moles of sugar to molecules of sugar is 2.992934 × 10^21 molecules, assuming the sticks of gum were exactly the same mass and sugar content, the moles would double 0.00994 moles.
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An alkyne with the molecular formula C6H10 was reduced with H2 and Lindlar's catalyst. Ozonolysis of the resulting alkene afforded formaldehyde and an unbranched aldehyde. What is the IUPAC name of the alkyne that was reduced?
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Given that the alkyne has a formula as C₆H₁₀, the IUPAC name of the alkyne is hexyne
What is an alkyne?Alkynes are unsaturated hydcarbons with the general formula of CₙH₂ₙ₋₂. They contains triple bonds (C≡C) in the carbon chains. The simplest member of this family is ethyne (C₂H₂)
The first nine members of the Alkynes sre:
Ethyne, C₂H₂Propyne, C₃H₄ Butyne, C₄H₆ Pentyne, C₅H₈Hexyne, C₆H₁₀Heptyne, C₇H₁₂Octyne, C₈H₁₄Nonyne, C₉H₁₆Decyne, C₁₀H₁₈Considering the question given above, the formula of the alkyne is C₆H₁₀.
Therefore, the name of the alkyne is hexyne
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About how many centimeters will make an inch?
A)5
B)2+
C) 200
D)10
Answers
Answer: B) 2+
Explanation:
There are exactly 2.54 centimeters in an inch, the closest option is:
B) 2+
Answer:
2.54 centimetres
Explanation:
Ur options are wrong
Based upon the chemical equation in #2 above, if 45.7g C2H4O2 are used in the reaction, how many grams of H2O will result
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calcium chloride and carbon dioxide
The release of aluminium ions as a result of acid rain is less significant in areas containing limestone rock - why?
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Answer:
As it flows through the soil, acidic rain water can leach aluminum from soil clay particles and then flow into streams and lakes. The more acid that is introduced to the ecosystem, the more aluminum is released. Some types of plants and animals are able to tolerate acidic waters and moderate amounts of aluminum
Explanation:
What is the pressure exerted by a force of 14.7 N over an area of 0.00482 m²?
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Answer:
[tex]p= \frac{F}{A} = \frac{ 14.7 }{0.00482} = 3050 \: Pa[/tex]
What is the product of radioactive decay 0/-1 e called?
A. An alpha particle
B. A beta particle
C. Nuclear fission
D. A gamma wave
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Answer:
it represents a beta particle so the answer is B a beta particle
Answer:
The product of radioactive decay ⁰-₁e called a beta particle
B. A beta particle
Engineers design computers to cool down quickly so they do not break. What happens to the molecules in a computer when the temperature of the computer decreases?
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Answer:The energy of the molecules in the computer decreases.
Explanation:LET ME KNO IM WRONG
Answer: The energy of the molecules decrease in the computer
Explanation:
This is because you turned off the computer cooling it down and slowing the molecules.
find the molarity of 131 g Ba(NO3)2 dissolved in 750.0 water
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Answer:
6.68 x 10^-4
Explanation:
131g ÷ 261.337g/mol = 0.5012685 moles
0.5012685 moles ÷ 750.0 liters =
0.5012685÷ 750.0=0.000668358
6.68 x 10^-4
calculate the pressure in atmospheres of 1.92 moles of helium gas in a 10.0L container at 25C
Answers
The pressure in atmospheres of the given mole and volume of helium gas is 4.7atm.
Given the data in the question;
Amount of helium; [tex]n = 1.92mol[/tex]Volume of the gas; [tex]V = 10.0L[/tex]Temperature; [tex]T = 25^0C = 298.15K[/tex]Pressure in atmosphere; [tex]P = \ ?[/tex]
Ideal Gas LawThe Ideal gas law emphasizes on the behavior of a hypothetical ideal gas. It states that pressure P multiply by volume V is equal to moles times temperature and the universal gas constant.
It is expressed;
[tex]PV = nRT[/tex]
Where P is pressure, V is volume, n is the amount of substance, T is temperature and R is the ideal gas constant.( [tex]R = 0.08206Latm/molK[/tex] ).
To determine the pressure in atmosphere, we substitute our values into the expression above.
[tex]PV = nRT\\\\P = \frac{nRT}{V} \\\\P = \frac{1.92mol\ *\ 0.08206Latm/molK\ *\ 298.15K}{10.0L} \\\\P = \frac{46.975Latm}{10.0L}\\\\P = 4.7atm[/tex]
Therefore, the pressure in atmospheres of the given mole and volume of helium gas is 4.7atm.
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What are the three main groups of macronutrients? (select three please)
minerals
proteins
fats
carboydrates
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Answer:
protein, carbs, and fats.
Explanation:
Those are the three main sources of macronutrients.
(this isn't a chemistry, it's health)
Answer:
fats, carbohydrates and proteins
Explanation:
I don't know, I answered that on my test and it was correct
If an atom such as hydrogen is able to form a covalent bond describe what happens when the electron shells of two atoms overlap
Answers
Answer:
they share electrons to complete eachothers outer shell
Explanation:
Giving Brainliest
Which choice is an example of the use of sound energy in everyday life?
batteries powering toys
fireplaces keeping people warm
lights helping people see
car horns preventing accidents
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Answer:
car horn preventing accidents
Answer:
d) car horns preventing accidents
Explanation:
the use of car horns represents sound energy in everyday life. batteries use chemical energy that is turned into electrical energy, fireplaces use thermal energy, and lights use electrical energy!
use the kinetic theory to explain why a windy day is a good drying day?
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Explanation:
Wind helps to get out molecules of water from clothes.
In summer Ball is hard b because due to heat kinetic energy of molecules increases
dk how to do this :)
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Answer:
2Mg, 2 02, MgO
When salt is added to water, what happens to the molecules?
The water molecules remain together. The salt molecules break apart.
Water and salt molecules remain together.
The water molecules break apart. The salt molecules remain together.
Water and salt molecules break apart.
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Answer:
The the salt dissolves
Explanation:
The salt dissolves because the covalent bonds of water are stronger than the ionic bonds in the salt molecules.
Which characteristic do all owl families share? A.) small eyes B.) large body size C.) nighttime hunting D.) heart-shaped faces
Need this answer in 5 MINUTES!
If any turtors are out there I need a Verified answer
Answers
Heart-shaped faces is the characteristic all owl families share and it is denoted as option D.
What is an Owl?
This is a type of bird which is known for its heart shaped face, big round eyes and reversible toe.
This animal has majority of its species as night time hunters which is why option D was chosen.
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Which of the following is most likely to lose electrons in an ionic compound?
a. lead (Pb)
b. carbon (C)
C. oxygen (O)
d. hydrogen (H)
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Answer:
a. Lead (Pb)
Am 100% sure
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an organisms particular role in its habitat,or when and how it survives, is called its
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Answer:
Niche.
A niche is a place where an organism lives at a given time or how the organism lives there.