what are the molecular structure,structural formula and strength of intermolecular forces for the substances methylated spirits,Acetone,water,glycerine and oil?
Answer:
Glycerine, water and methylated spirits have hydrogen bonds between the molecules. However, in water and Glycerine these intermolecular forces are very strong while in the methylated spirits they are slightly weaker. This leads to the higher boiling point for water and Glycerine.
Explanation:
In chemistry a molecular formula indicates every single atom and its numbers in a chemical compound. Hence the molecular formula C3H8O3 simply says that there are three carbon (C) atoms, eight hydrogen (H) atoms and three oxygen (O) atoms in this compound.
Sam and Albert reacted 3.5 moles of hydrogen gas with an excess of oxygen and had a percent yield of 85%. How many moles of water did they actually produce
The mole of water Sam and Albert produced would be 3.5 moles
Mole ratioFrom the balanced equation of the reaction:
[tex]2H_2 (g) + O_2 (g) --- > 2H_2O (l)[/tex]
The mole ratio of hydrogen to water is 1:1.
Thus, if 3.5 moles of hydrogen gas is reacted with excess oxygen, 3.5 moles of water will also be produced.
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: An unknown metal crystallizes in the cubic crystal structure. The metal has a radius 140pm, atomic mass of 135 g/mol, and density of 13.3 g/cm3. What type of cubic unit cell does this metal crystallize as
The cubic unit cell this metal crystallize as is BCC structure .
What is unit cell ?
The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell.
The unit cell consists of lattice points that represent the locations of atoms or ions.
The entire structure then consists of this unit cell repeating in three dimensions
[tex]\rm \rho =\dfrac{nM}{N_{0} a^{3}} \\\\\\\\\rm n =\dfrac{\rho N_{0} a^{3}}{M} \\\\\\\\Assuming\; it \; to \; be \; a\; BCC\; structure \\\\\\ r = \dfrac{\sqrt{3} \times a}{4} \\\\\\Therefore\; a = 3.23 \times 10^{-8}\\\\\\\\\rm n =\dfrac{13.3 \times 6.022 \times 10^{23}\times 3.23^{3}\times (10^{-8})^{3}}{135} \\\\[/tex]
n= 2
Hence our assumption was correct
It is a BCC structure .
Therefore the cubic unit cell this metal crystallize as is BCC structure .
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4. Who has the most sensitive taste buds?
adults
babies
teenagers
the elderly
Answer:
Taste bufs
Explanation:
May be teenager or adult is the most probable answer because teenager and adult are fully developed species of human so they can have most sensitive taste bud
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describe one advantage and one disadvantage of obtaining energy from nuclear fission
Answer:
one advantage: no air pollutants, one disadvantage: gives off radioactive waste
A sealed container of N2 gas has a pressure of 836 kPa at 54.7 ∘ C. After it is left out in the sun the pressure increases by 79.9 kPa. What is the new temperature of the container?
Based on your research, which source of energy do you think best meets the needs of society? Defend your answer in 50 to 100 words.
Currently, fossil fuels meet the 80% of needs of the society. But it is a non-renewable source, and it will extinct soon. The leading renewable source is wind power.
What is the non-renewable and renewable source?Non-renewable energy are the energies that will require a thousand of years to make and ones extinct, will not be prepared.
Renewable energy sources can be prepared again and again, examples are wind, solar, hydropower.
Thus, the fossil fuel and wind power is the leading source of energy that meets the needs of society.
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What is the specific heat of a substance if a mass of 10.0 kg increases in temperature from 10.0°c to 70.0°c when 2,520 j of heat is applied? use q equals m c subscript p delta t.. 0.00420 j/(gi°c) 0.00661 j/(gi°c) 238 j/(gi°c) 252 j/(gi°c)
The specific heat of a substance if a mass of 10.0 kg increases in temperature from 10.0°C to 70.0°C when 2,520 J of heat is applied is 4.2 J/g°C.
How to calculate specific heat?The specific heat capacity of a substance can be calculated using the following formula:
Q = m × c × ∆T
Where;
Q = quantity of heat absorbed or releasedm = mass of substancec = specific heat capacity∆T = change in temperature2520 = 10 × c × (70 - 10)
2520 = 600c
c = 4.2 J/g°C
Therefore, the specific heat of a substance if a mass of 10.0 kg increases in temperature from 10.0°C to 70.0°C when 2,520 J of heat is applied is 4.2 J/g°C.
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Answer:
A
Explanation:
Name these compounds according to IUPAC.
Functional groups are alcohol, carboxylic acids, ester, ketone, etc. The compounds are 2,2 dimethyl propane, 2-methyl butane, and ethanol.
What are functional groups?Functional groups provide specific chemical properties that are linked to the main chain of the compound and define the role of the compound. The first compound has two methyl (CH₃) groups at the second carbon and a total of three carbons making the compound, 2,2 dimethyl propane.
In the second compound, there is a methyl group on the second carbon and total of four carbons making it 2-methyl butane, and the third compound is two carbon with alcohol as the functional group making it ethanol.
Therefore, the compounds are 2,2 dimethyl propane, 2-methyl butane, and ethanol.
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Why might chromatin be tangled in the nucleus?
1. How can the rate of a chemical reaction be controlled?
Answer:
it can be controlled by balancing of the reaction
A chemist heated a sample of steel wool in a burner flame exposed to oxygen in the air. He also heated a sample of steel wool in a container of nearly 100% oxygen. The steel wool sample in the container reacted faster than the other sample. a.Explain why.
Answer:
Explanation:
Explanation
Look at the equation that describes what is going on.
4Fe(s)+3O2(g)⟶2Fe2O3
Air is about 20% oxygen. The flame of steel wool is a gentle one since the oxygen is in limited supply.
Steel wool is about 99 % Iron. The rection above tells you that when steel wool ignites, it becomes Fe+3
Answer: The rule is the more oxygen you have, the more violent the burning process.
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answer
Which sentence best describes Earth's rotation?
Earth rotates on its axis once every two days.
Earth rotates on its axis once every year.
Earth rotates on its axis once every 24 hours.
Earth rotates on its axis twice every 24 hours.
Answer:
C.
Explanation:
no explanation but hope this helps
Answer:
A
Explanation: IF U PRESS A U GO TO COLLAGE
......................
Give the name for the alkyl.
Let's see
Calculate carbons
Total 3 ,prop word root to be usedCheck bondings
All single bondsThe compound is
-CH2-CH2-CH3The name is
Propyl17. Explain the relationship between atmospheric pressure and the actual boiling point of a liquid.
Answer:
The lower the atmospheric pressure, the lower the boiling point will be. The greater the pressure, the more energy required for liquids to boil, and the higher the boiling point.
Select the correct answer from each drop-down menu. 2naoh h2so4 → na2so4 h2o the equation is because the number of hydrogen atoms and atoms is in the reactants and in the products.
The equation will balance because the number of hydrogen atoms and atoms is in the reactants and in the products in this case is 2.
How to balance reactions?
Reaction balancing is a method used in several areas of Chemistry to determine the amount of matter of each of the substances participating in the reaction, as well as to establish the existing proportions between the components.
So, since you must have the same amount of sodium and chlorine on each side of the reaction, then you have multiplay the NaCl for 2.
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The half-life of a certain element is 100 days. How many half-lives will it be before only one-fourth of this element
remains?
4
50
25
2
In an experiment, the same mass of magnesium metal reacted with the same amount of two different acids. the acid used in reaction 1 was ethanoic acid and in reaction 2 it was hydrochloric acid. which reaction produced the most gas?
The mole ratio of the reaction shows that equal volumes of hydrogen gas will be produced by the two reactions.
What is the mole ratio of a reaction?The mole ratio of a reaction is the ratio in which the reactants and products of a given reaction occur for the reaction to proceed to completion.
The mole ratio of a reaction is also known as the stoichiometry of the reaction.
The equation of the two reactions are given below:
[tex]Mg + 2HCl \rightarrow MgCl_2 + H_2[/tex]
[tex]Mg + 2CH_3COOH \rightarrow (CH_3COO)_2Mg + H_2 \\ [/tex]
From the equation of the reaction reaction, an equal volume of hydrogen gas will be produced by the two reactions.
Therefore, the mole ratio of the reaction shows that equal volumes of hydrogen gas will be produced by the two reactions.
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The lewis dot structure rule states that
s=n-a.
recall that s represents the.total
number of valence electrons needed for
all the atoms in a molecule to achieve an
octet.
what is s for silicon tetrachloride, sic14?
Answer:
32
Explanation:
The total valence electron is available for the Silicon tetrachloride
lewis structure is 32
A mole is known by what other name?
Answer: avogadros number/constant
Explanation:
If an ice cream melts do you have more less or the same amount of matter after the melting
When ice cream melts you have the same amount of matter after the melting.
Principle of conservation of massAccording to the law of conservation of mass, mass is neither created nor destroyed but can be converted from one form to another. Hence, a mass of ice can be converted to an equal mass of water.
When ice cream melts you have the same amount of matter after the melting.
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Please help! At a pressure of 200 atm, water’s melting point is approximately _____ (-2 C, 0 C, 10 C, or 370 C) and its boiling point is approximately ____ (370 C, 10 C, 0 C, -2 C)
At a pressure of 200 atm, water’s melting point is approximately 0⁰C and its boiling point is approximately 370⁰C.
What is melting point temperature?Melting point is the temperature at which a substance changes into liquid form.
From the chart, at a pressure of 200 atm, water’s melting point is approximately 0⁰C.
What is boiling point temperature?This is the temperature at which a liquid turns into a vapor. It is the temperature at which liquid and vapor co-exist.
From the chart, at a pressure of 200 atm, water’s boiling point is approximately 370⁰C.
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Which of the following increases air’s ability to hold water vapor? a. increase in wind speed c. decrease in temperature b. increase in temperature d. decrease in air pressure Please select the best answer from the choices provided A B C D
Increase in temperature increases air's ability to hold water vapour. That is option B.
What is water vapour?Water vapor is defined as the form of water when in gaseous state.
Water turns to vapour when heat is added to it leading to evaporation.
Therefore, Increase in temperature increases air's ability to hold water vapour.
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what three things did rutherford discover about the atom
At 0.500 atm and 15.0°C a sample of gas occupies 120. L. What volume does it occupy at
0.250 atm and 10.0°C?
O236 L
O 60 L
O 111 L
O 480 L
The combined gas law is used to determine the relationship between the pressure, temperature, and volume of the gas. The volume of the gas at 0.250 atm is 236 L. Thus, option A is correct.
What is combined gas law?The combined gas law uses the ideal gas equation to estimate the temperature, volume, or pressure of the given gas.
Given,
Initial pressure = 0.500 atm
Initial temperature = 288.15 K
Initial volume = 120 L
Final pressure = 0.250 atm
Final temperature = 283.15 K
The final volume is calculated as:
V₂ = (P₁V₁ T₂) ÷ (P₂ T₁)
= 0.500 × 120 × 283.15 ÷ 0.250 × 288.15
= 16989 ÷ 72.03
= 235.86 L
Therefore, 236 L is the final volume at 0.250 atm.
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As hydrochloric acid is added to a solution of sodium hydroxide, the pH of the mixture will
A) stay the same
B) increase
C) decrease
D) change unpredictably
C) decrease
hydrochloric acid: strong acid, pH <7
sodium hydroxide: strong base, pH>7
what is the chemical formulae for lime water
Answer:
The formula for lime water is Ca(OH)2 and the chemical name for lime water is calcium hydroxide.Explanation:
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[tex]\\ \purple{MaggieEve}[/tex]
Compounds that contain carbon-hydrogen bonding are collectively termed.
Answer:
collectively they're known as HYDROCARBONS
describe what happens when water vapour cools to liquid water(change in arrangement,change in movement,change in energy)
Answer:
CONDENSATION When steam is cooled, it releases thermal energy and turns into its liquid state. This process is called condensation.
Explanation:
