which statement about the temperatures of phase changes and electrostatic forces holding the molecules is correct?(1 point)
Answers
The temperature at which phase changes occur is highly dependent on the electrostatic forces between the molecules in the substance.
The forces that hold molecules together are called intermolecular forces. These intermolecular forces affect the temperature at which phase changes occur. The statement about phase changes and electrostatic forces that is correct is that; "the temperatures at which a substance changes phases indicate the relative strength of the forces between molecules in the substance."
There are three states of matter, solid liquid and gas. The order of intermolecular forces in all the states of matter are not the same. The order of strongest collective electrostatic forces to weakest collective electrostatic forces is; solid, liquid, gas.
When water boils, the forces between water molecules break, and the bonds between the atoms in water are unchanged.
When a sample of calcium carbonate is cooled, the forces strengthen, and the molecule structure becomes more rigid.
If the boiling point of acetone is lower than the boiling point of ethanol, then, the intermolecular forces in ethanol are stronger than the intermolecular forces in acetone.
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This answer is very late, so this is for whoever is taking the Electrical Bonding Particle Spacing Quick Check lol
The answer is The temperatures at which a substance changes phases indicate the relative strength of the forces between molecules in the substance.
The rest of the answers on the quick check are...
- solid, liquid, gas
- The forces between water molecules break, and the bonds between the atoms in water are unchanged.
- The forces strengthen, and the molecule structure becomes more rigid.
- The intermolecular forces in ethanol are stronger than the intermolecular forces in acetone.
Related Questions
2 C2H6 + 7 O2 → 6 H2O + 4 CO2
If you start with 5.20 moles of C2H6, how many moles of H2O will you produce?
Answers
2 C2H6 + 7 O2 → 6 H2O + 4 CO2 If you start with 5.20 moles of C2H6, 10.4 moles of H2O will produce.
What do you mean by mole ?The term mole is defined as the amount of substance of a system which contains as many elementary entities.
One mole of any substance is equal to 6.023 × 10²³ units of that substance such as atoms, molecules, or ions. The number 6.023 × 10²³ is called as Avogadro's number or Avogadro's constant.
The mole concept can be used to convert between mass and number of particles.
5.20 moles of ethane × 4 moles of carbon dioxide / 2 mole of ethane
= 5.20 × 4 / 2
= 10.4 moles
Thus, If you start with 5.20 moles of C2H6, 10.4 moles of H2O will produce.
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will mark brainliest :) how many moles of a solute is present in 4.00 L of an 8.30 M solution?
a. 33.2 mol
b. it depends on the volume of water
c. 8.3 mol
d. it depends on whether the solute is ionic or covalent
Answers
The answer is 33.2 moles of a solute is present in 4.00 L of an 8.30 M solution , Option A is correct .
What is Molarity ?Molarity is defined as the amount of solute (in moles)in per litre of solution.
It is also known as molar concentration of a solution , It is expressed in mol/l
\(\rm M =\dfrac{moles \;of\; solute}{Volume \;of \;solution} \\\\\\\rm M = \dfrac{n}{V} \\\)
We can rearrange this equation to get the number of moles:
n= M * V
The molarity of solution is 8.3 M and the volume given is 4 litres
the moles will be n = 8.30 * 4 = 33.2 moles
Therefore 33.2 moles of a solute is present in 4.00 L of an 8.30 M solution , Option A is correct .
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Which substance is an Arrhenius acid?
A) HBr
B) NaBr
C) NaOH
D) NH3
Answers
Answer:
A
Explanation:
Answer:a
Explanation:
the structural formulas for two isomers of 1 2-dichloroethane
Answers
It is considered a carcinogen by the International Agency for Research on Cancer (IARC) and is classified as a Group 2A agent (probably carcinogenic to humans).
1,2-dichloroethane, also called ethylene dichloride (EDC), is an organic compound with the formula C2H4Cl2. It is a colorless liquid with a chloroform-like odor.1,2-dichloroethane is also called ethylene dichloride (EDC), which is an organochlorine compound having the formula C2H4Cl2.
The structural formulas for two isomers of 1,2-dichloroethane are mentioned below:Isomer 1 of 1,2-dichloroethane: CH3CHCl2Isomer 2 of 1,2-dichloroethane: CH2ClCH2ClThe two isomers of 1,2-dichloroethane have different structural formulas, but their molecular formulas are the same.
The first isomer has a chlorine atom attached to the first carbon atom, whereas the second isomer has a chlorine atom attached to the second carbon atom. They have different physical properties due to their differing structural formulas.
1,2-dichloroethane is used mainly in the production of vinyl chloride, which is the precursor to polyvinyl chloride (PVC). It is also used as a solvent for a variety of applications, such as in the manufacture of pesticides and synthetic rubber.
It was once widely used as a refrigerant, but its use in this application has been phased out due to its toxicity and environmental concerns. In humans, exposure to 1,2-dichloroethane can cause damage to the liver, kidneys, and nervous system.
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The stinging sensation from red ants comes from formic acid, which dissociates based on the following equilibrium:HCOOH(aq) ⇄ H+(aq) + HCO2-(aq) Ka= 1.8 x 10-4What is the pH of a 0.50 M solution of formic acid?
Answers
The pH of a 0.50 M solution of formic acid is approximately 2.96.
What is formic acid?
Formic acid, also known as methanoic acid, is a simple organic compound with the chemical formula HCOOH. It is the simplest carboxylic acid and derives its name from its occurrence in the venom of ants (Latin: formica means ant).
To calculate the pH of a solution of formic acid, we can use the equilibrium constant expression and the fact that formic acid is a weak acid. The equilibrium constant (Ka) is given as 1.8 x 10⁻⁴. Since formic acid is a monoprotic acid, the concentration of H+ ions formed will be equal to the concentration of formic acid that dissociates.
Let's assume x is the concentration of H⁺ ions formed. Then, the equilibrium concentrations of HCOOH and HCOO⁻ can be expressed as (0.50 - x) and x, respectively. Using the equilibrium constant expression, we can write:
Ka = [H+][HCOO-] / [HCOOH]
Substituting the values, we have:
1.8 x 10⁻⁴ = x² / (0.50 - x)
Since the concentration of H+ is small compared to the initial concentration of formic acid, we can approximate 0.50 - x as 0.50. Simplifying the equation and solving for x, we find x ≈ 0.0155 M.
Finally, we can calculate the pH using the equation pH = -log[H+]. Taking the negative logarithm of 0.0155, we obtain a pH value of approximately 2.96.
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1. 2 NH3 + 3 CuO → 3 Cu + N2 + 3 H2O
In the above equation, how many grams of N2 can be made when 14.4 moles of CuO are consumed?
Round your answer to the nearest tenth. If you answer is a whole number like 4, report the answer as 4.0
Use the following molar masses. If you do not use these masses, the computer will mark your answer incorrect.:
Element Molar Mass
Hydrogen 1
Nitrogen 14
Copper 63.5
Oxygen 16
2. For the reaction C + 2H2 → CH4, how many grams of carbon are required to produce 19.5 moles of methane, CH4 ?
Round your answer to the nearest tenth. If you answer is a whole number like 4, report the answer as 4.0
Use the following molar masses. If you do not use these masses, the computer will mark your answer incorrect.:
Element Molar Mass
Hydrogen 1
Carbon 12
3. For the reaction C + 2H2 → CH4, how many moles of carbon are needed to make 119.4 grams of methane, CH4 ?
Round your answer to the nearest tenth. If you answer is a whole number like 4, report the answer as 4.0
Use the following molar masses. If you do not use these masses, the computer will mark your answer incorrect.:
Element
Molar Mass
Hydrogen
1
Carbon
12
4. 2 NH3 + 3 CuO --> 3 Cu + N2 + 3 H2O
In the above equation how many moles of N2 can be made when 127.4 grams of CuO are consumed?
Round your answer to the nearest tenth. If you answer is a whole number like 4, report the answer as 4.0
Use the following molar masses. If you do not use these masses, the computer will mark your answer incorrect.:
Element
Molar Mass
Hydrogen
1
Nitrogen
14
Copper
63.5
Oxygen
16
Answers
Answer:
Explanation:
First, we need to find the limiting reactant between CuO and NH3. We can do this by calculating the moles of each reactant based on the given amount of CuO:
Moles of CuO = 14.4 mol CuO
Moles of NH3 = (2/3) x 14.4 mol CuO = 9.6 mol NH3
Since NH3 has a smaller mole value than CuO, it is the limiting reactant. Thus, we need to use the mole ratio between NH3 and N2 to find the moles of N2 produced:
Moles of N2 = (1/2) x 9.6 mol NH3 = 4.8 mol N2
Finally, we can use the molar mass of N2 to find the mass of N2 produced:
Mass of N2 = 4.8 mol N2 x 28 g/mol N2 = 134.4 g N2
Rounded to the nearest tenth, the answer is 134.4 g N2.
The balanced chemical equation tells us that 1 mole of carbon reacts with 2 moles of hydrogen to produce 1 mole of methane. Thus, we can use the mole ratio to find the moles of carbon needed:
Moles of C = 1/3 x 19.5 mol CH4 = 6.5 mol C
Finally, we can use the molar mass of carbon to find the mass of carbon needed:
Mass of C = 6.5 mol C x 12 g/mol C = 78 g C
Rounded to the nearest tenth, the answer is 78.0 g C.
We can use the molar mass of methane to convert the given mass to moles:
Moles of CH4 = 119.4 g CH4 / 16 g/mol CH4 = 7.5 mol CH4
Since the balanced chemical equation tells us that 1 mole of carbon reacts with 1 mole of methane, we need the same amount of moles of carbon:
Moles of C = 7.5 mol CH4
Rounded to the nearest tenth, the answer is 7.5 mol C.
Similar to the first question, we need to find the limiting reactant between CuO and NH3. We can do this by calculating the moles of each reactant based on the given mass of CuO:
Moles of CuO = 127.4 g CuO / 63.5 g/mol CuO = 2.0 mol CuO
Moles of NH3 = (2/3) x 2.0 mol CuO = 1.3 mol NH3
Since NH3 has a smaller mole value than CuO, it is the limiting reactant. Thus, we need to use the mole ratio between NH3 and N2 to find the moles of N2 produced:
Moles of N2 = (1/2) x 1.3 mol NH3 = 0.65 mol N2
Rounded to the nearest tenth, the answer is 0.7 mol N2.
Calculate the pH of the solution formed by adding 50.0 mL of 0.0200 M NaOH to 100.0 mL of 0.0100 M formic acid. Ka
Answers
To calculate the pH of the solution formed by adding 50.0 mL of 0.0200 M NaOH to 100.0 mL of 0.0100 M formic acid,
we first need to write the balanced equation for the reaction that occurs. The reaction between formic acid and NaOH is as follows: HCOOH + NaOH → NaCOOH + H2O,
From this equation, we can see that the acid and the base will react to form the salt NaCOOH and water. Now, we need to find the moles of formic acid and NaOH that are present in the solution.
Moles of formic acid = concentration x volume = 0.0100 M x 0.100 L = 0.00100 moles, Moles of NaOH = concentration x volume = 0.0200 M x 0.0500 L = 0.00100 moles, Since the moles of formic acid and NaOH are equal, they will react completely.
After the reaction occurs, the solution will contain the salt NaCOOH and water. Since NaCOOH is a salt of a weak acid, it will undergo hydrolysis in water, which means it will react with water to form an acidic solution. The hydrolysis reaction is as follows: NaCOOH + H2O → HCOOH + Na+ + OH-.
From this equation, we can see that the salt reacts with water to form formic acid, Na+ ions, and OH- ions. Now, we can write an expression for the equilibrium constant (Ka) for the hydrolysis reaction: Ka = [HCOOH][OH-] / [NaCOOH],
Since we know the value of Ka for formic acid (1.77 x 10^-4), we can use this equation to calculate the concentration of H+ ions in the solution,
which will give us the pH, [HCOOH] = [OH-] = x (since the solution is neutral, [H+] = [OH-]) , [NaCOOH] = 0.00100 moles / (0.100 L + 0.050 L) = 0.00667 M, Ka = [x][x] / 0.00667, 1.77 x 10^-4 = x^2 / 0.00667, x = 2.10 x 10^-4 M.
Therefore, the pH of the solution is calculated as follows: pH = -log[H+] = -log(2.10 x 10^-4) = 3.68, So the pH of the solution formed by adding 50.0 mL of 0.0200 M NaOH to 100.0 mL of 0.0100 M formic acid is 3.68.
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HELP PLEASE
1. Locations where volcanoes form far from plate boundaries are called
A. islands
B. hot spots
C. divergent zones
Answers
What is called exothermic
Answers
An exothermic process is one that gives off heat.
Explanation:
This heat is transferred to the surroundings. An endothermic process is one in which heat has to be supplied to the system from the surroundings.
Carbon cycle – What are the main reservoirs
of the carbon cycle? Where do the inorganic and organic carbon
cycles interact? What are the major differences and similarities
between the inorganic and organic carbon?
Answers
The main reservoirs of the carbon cycle are the atmosphere, oceans, land (including vegetation and soils), and fossil fuels. In these reservoirs, carbon exists in both inorganic and organic forms.
The inorganic carbon cycle involves the exchange of carbon dioxide (CO2) between the atmosphere and oceans through processes like photosynthesis and respiration.
Organic carbon, on the other hand, is found in living organisms, dead organic matter, and soil organic matter. It is cycled through processes such as decomposition and consumption by organisms. The interactions between the inorganic and organic carbon cycles occur primarily in the biosphere, where photosynthesis converts inorganic carbon into organic carbon compounds. While inorganic carbon is primarily in the form of CO2, organic carbon is present in complex organic molecules. Both forms of carbon play crucial roles in energy transfer, nutrient cycling, and climate regulation.
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of the molecules pf3 and pcl3, which has bonds that are more polar?
Answers
The molecule PF3 has more polar bonds compared to PCl3 due to the higher electronegativity of fluorine compared to chlorine. This results in a larger separation of charge and a stronger dipole moment in PF3.
The electronegativity difference between atoms determines the polarity of a bond. In PF3, the phosphorus atom forms covalent bonds with three fluorine atoms.
Since fluorine is highly electronegative, it attracts electrons more strongly, resulting in a partial negative charge on fluorine and a partial positive charge on phosphorus.
In PCl3, the phosphorus atom forms covalent bonds with three chlorine atoms, which have lower electronegativity compared to fluorine. Therefore, the P-F bonds in PF3 are more polar than the P-Cl bonds in PCl3, making PF3 have more polar bonds overall.
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Describe particle movement in solid,liquid and gas
Answers
Answer:
In a solid, they're really close together and vibrate a LITTLE, in a liquid they're kinda close together but change movement because water will change shape depending on the container they're in. For gas they are spread far from each other and vibrate A LOT
Explanation:
If 33.0 grams of hydrogen gas react with 300. grams of oxygen gas, what is the percent yield if an experiment produces 250. grams of water? Use the balanced equation from question 3.
Answers
Answer:
can you show us question 3 pls
Explanation:
which feature in the 1h nmr spectrum provides information about the electronic environment of the protons in a compound?
Answers
The chemical shift is the feature in the 1H NMR spectrum that provides information about the electronic environment of the protons in a compound.
The chemical shift results from the interaction between the magnetic field generated by the NMR instrument and the electronic environment of the protons.
The chemical shift is measured in parts per million (ppm) and reflects the shielding or deshielding effect of the surrounding electron density on the proton. Electronegative atoms, such as oxygen or nitrogen, that are close to the proton will cause deshielding, resulting in a higher chemical shift.
On the other hand, atoms with electron-donating properties, such as alkyl or aryl groups, will cause shielding, resulting in a lower chemical shift. Thus, the chemical shift provides information about the electron density and electronic environment of the protons in a molecule.
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*2Al(OH), + 3H,SO, Al(SO4)2 + 6H2O
reaction type
Answers
The charge of the atom is _______ because there are ______ numbers of and______ in an atom.
Answers
Answer:
see below
Explanation:
the charge of the atom is neutral because there are equal numbers of protons and electrons in an atom.
hope this helps
please mark
7.6 The diagrams show the atoms in four different substances. Each circle represents an atom.
Answers
Answer:
A and C represent elements while B and D represent Compounds
Explanation:
chemical elements cannot be broken down into simpler substances by any chemical reaction. While A chemical compound is a chemical substance composed of many identical molecules composed of atoms from more than one element held together by chemical bonds
how many moles are in 32.3g of calcium phosphate
Answers
Answer: the formula mass of calcium phosphate [Ca3(PO4)2] is 310.177 amu, so its molar mass is 310.177 g/mol. This is the mass of calcium phosphate that contains 6.022 × 1023 formula units.
Answer: 310.177
how many significant figures are in the number 0.00208?
Answers
The number 0.00208 has three significant figures. Significant figures are the digits in a number that carry meaningful information about its precision. In the case of 0.00208, the digits 2, 0, and 8 are all significant.
Zeros that appear before the first nonzero digit (leading zeros) are not considered significant. Therefore, the leading zero in 0.00208 is not counted as a significant figure.
To summarize, the number 0.00208 has three significant figures: 2, 0, and 8.
If we write the number as 0.002080, the trailing zero after the 8 would be considered significant, indicating that there are four significant figures in the number.
If we express the number in scientific notation, such as 2.08 x 10^(-3), the digits 2, 0, and 8 remain significant, regardless of the exponent. Hence, there are still three significant figures in the number.
It's important to note that significant figures are not limited to decimal numbers. They are also relevant in whole numbers and in calculations involving measurements with uncertainties.
Understanding the concept of significant figures allows us to maintain consistency and precision in calculations and measurements. By recognizing the significant figures in a number, we can appropriately determine the number of decimal places to retain in the result of a calculation or measurement.
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Balancing Chemical Reactions Worksheet A glow stick is a popular toy and safety device. To use a glow stick, you bend a small flexible plastic tube to break a small glass capsule inside, at which point the stick begins to glow. How do you think this works
Answers
Answer:
Concept of chemi-fluorescence
Explanation:
A glow stick usually consists of two chemicals in a larger plastic tube: , a base catalyst (mostly sodium salicylate), and a suitable dye (sensitizer, or fluorophor). This creates an exergonic reaction when mixed together.
When a glow stick is bent, the flurophor which is a chemical that easily re-emits light upon excitation in smaller capsules is released into the other substance, there by causing it to emit radiation/light in the uv-visible region. The brightness and longevity of the glow stick is determined by varying the concentration of these chemicals.
I hope this explanation clarifies things.
if you were to spill a little benzoic acid as you mix it with the lauric acid will the calculated molecular weight be too high or too low? why?
Answers
If you were to spill a little benzoic acid as you mix it with the lauric acid, the calculated molecular weight would be too high.
This is because the amount of benzoic acid would be greater than the amount of lauric acid, and the molecular weight of benzoic acid is higher than the molecular weight of lauric acid.
The molecular weight of a substance is the sum of the atomic weights of the atoms that make up the substance. Benzoic acid has a molecular weight of 122.12 g/mol, while lauric acid has a molecular weight of 200.32 g/mol.
If you were to spill a little benzoic acid, the total amount of benzoic acid and lauric acid would be greater than the amount of lauric acid that would be present if no benzoic acid were spilled.
This would cause the calculated molecular weight to be higher than the actual molecular weight of lauric acid.
To avoid this, it is important to be careful when mixing benzoic acid and lauric acid. It is also important to use a balance that is accurate to at least 0.01 g to measure the amounts of benzoic acid and lauric acid.
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Each element emits its own unique wavelength of light which can be used to determine the identity of that element. The packet or light wave emitted is called a
Answers
Answer:
Photon
Explanation:
The simplest description of a photon is to consider it as a bundle of electromagnetic energy.
In the context of wave - particle duality, light is considered sometimes as a particle. Each bundle of the particles of light wave is called a photon of light.
The wavelength of a photon of light emitted by an element can be used as a tool to identify that particular element.
Which are different structures of the eye? Select four options.
please help !!!!!!!!
pupil
cochlea
cornea
auricle
retina
lens
Answers
Answer:
Pupil, Cornea, Retina, and Lens
Explanation:
HURRY PLEASEE! I WILL MARK YOU BRAINLEST
ANSWER THE FOLLOWING QUESTIONS
Explain what is a solar eclipse and why they are so rare IN YOUR OWN WORDS
Explain what is a lunar eclipse and why the moon turns red, and why it's more common IN YOUR OWN WORDS
Answers
Answer:
This is true: Lunar eclipses happen more often. I think it's just a question of how big the shadows are: There is a lunar eclipse when the Earth blocks the Moon's light from the Sun. 7000 km away from the Moon, the Earth's shadow is about two lunar diameters wide. Much wider than a pancake. The reason that the moon turns red, is due to Earth's atmosphere. It bends red rays of sunlight into our planet's shadow and scatters out blue rays of light.
When the Moon casts a shadow on the Earth, it is called a solar eclipse. The Moon is a lot smaller now, and its shadow is also a lot smaller than it was before. Around 200 or 300 km across is how big the Moon's shadow is when it's far from the Earth.
Fun Facts:
- The 21st century has 224 solar eclipses and 230 lunar eclipses (all varieties of each combined)
The table below lists the naturally occurring isotopes of element X. Calculate the average atomic mass.
Mass of isotope Relative abundance
15.33 amu 28.60%
17.26 amu 13.30%
18.11 amu 58.10%
A) 17.65 amu
B) 17.11 amu
C) 16.90 amu
D) 17.20 amu
Answers
Answer:
D
Explanation:
I think it is D
Which chemical out of the following 4 is the most dangerous? Glucose, benzene,acetone, ether
Answers
Answer:
B.
Explanation: hope this helps
Benzene
100 cm³ of a gas at 27°C is cooled to 20°C at constant pressure .Calculate the volume of gas at 20°C.
Answers
According to Charle's law, the volume of the given mass of a gas is directly proportional to its absolute temperature provided that the pressure is constant. Mathemically;
\(\begin{gathered} V\alpha T \\ V=kT \\ k=\frac{V}{T} \\ k=\frac{V_1}{T_1}=\frac{V_2}{T_2} \end{gathered}\)where;
V1 and V2 are the initial and final volume of the gas
T1 and T2 are the initial and final temperatures of the gas (in Kelvin)
Given the following parameters:
\(\begin{gathered} V_1=100\operatorname{cm}^3 \\ T_1=27^0C=27+273=300K \\ T_2=20^0C=20+273=293K \\ V_2=\text{?} \end{gathered}\)Substitute the given parameters into the formula;
\(\begin{gathered} V_2=\frac{V_1T_2}{T_1}^{} \\ V_2=\frac{100\times293}{300} \\ V_2=\frac{29300}{300} \\ V_2=\frac{293}{3} \\ V_2=97.67\operatorname{cm}^3 \end{gathered}\)Therefore the volume of the gas at 20°C is approximately 97.67cm³
Write the chemical equation for water
Answers
Answer:
H2O
Explanation:
He(Neon) , Group and period
Answers
Answer:
Ne(Neon)
Group => 18
Period => 2nd
He(helium )
Group => 18
Period => 1st
what is rusting of iron?
Answers
Answer:
Rusting is an oxidation reaction. The iron reacts with water and oxygen to form hydrated iron(III) oxide, which we see as rust. Unlike rust, which can flake off the surface of iron and steel objects, the layer of aluminium oxide does not flake off.
Explanation:
Iron = reacts with oxygen and water to form hydrated iron oxide, we then start to see rust.
This prevents the metal from coming in any contact with air. Hope this helps :)