Which statements about the properties of different types of crystalline solids are correct? Select all that apply.
Particles in a molecular solid are held together by intermolecular forces.
Metallic bonding involves the delocalization of electrons.
Ionic solids adopt many different types of unit cells.
Answers
The following are the correct statements regarding the properties of different types of crystalline solids: Particles in a molecular solid are held together by intermolecular forces.
Metallic bonding involves the delocalization of electrons. Ionic solids adopt many different types of unit cells. Particles in a molecular solid are held together by intermolecular forces. A molecular solid is a type of solid that is made up of molecules held together by van der Waals forces, dipole-dipole interactions, and hydrogen bonds. Ionic solids have strong electrostatic forces of attraction between the positive and negative ions.
Therefore, they have high melting and boiling points. The opposite charges of the ions in the crystal lattice attract each other, making it hard to break apart the lattice. Ionic solids adopt many different types of unit cells.Metallic bonding involves the delocalization of electrons. Metals have a sea of electrons that are free to move throughout the lattice of positive ions. These free electrons are responsible for the electrical conductivity of metals and their high ductility and malleability.
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Related Questions
Polarities of analyte functional group increase in the order of hydrocarbon ethers < esters
Answers
The correct order of the increasing polarity of the analyte functional group isEthers < Esters.
The given statement is "Polarities of analyte functional group increase in the order of hydrocarbon ethers < esters." The order of polarities of functional groups is the order of their increasing polarity (i.e., less polar to more polar) based on their electron-donating or withdrawing ability from the rest of the molecule.Polarity of analyte: The analyte's polarity is directly proportional to the dipole moment of the functional group, which is associated with a difference in electronegativity between the atoms that make up the functional group.The electronegativity of an element is its ability to attract electrons towards itself. The greater the difference in electronegativity between two atoms, the more polar their bond, and hence the greater the polarity of the molecule.
To find the correct order of the increasing polarity of the analyte functional group, let's first compare the two groups: hydrocarbon ethers and esters. Here, esters have a carbonyl group while ethers have an oxygen atom with two alkyl or aryl groups. The carbonyl group has more electronegative oxygen, which pulls electrons away from the carbon atom, resulting in a polar molecule. On the other hand, ethers have a less polar oxygen atom with two alkyl or aryl groups, making them less polar than esters. Therefore, the correct order of the increasing polarity of the analyte functional group isEthers < Esters.
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When Earth’s axis points away from the sun, the _________ Hemisphere has the longer days of summer.
Nort
Answers
Answer: northern hemisphere
Explanation: I looked it up. Plus I took a test with this question and when the teacher went over the answer i got it right.
Which is not a reason why Newton's laws are invalid for analyzing electrons' motion?
Answers
Newton's laws are not ideal for analyzing electrons' motion due to the nature of quantum mechanics, wave-particle duality, and the Heisenberg uncertainty principle.
Newton's laws are not invalid for analyzing electrons' motion due to the following reasons:
1. Quantum mechanics: Newton's laws are based on classical mechanics, which works well for macroscopic objects. However, when dealing with microscopic particles like electrons, quantum mechanics becomes the more accurate framework for understanding their behavior.
2. Wave-particle duality: Electrons exhibit both particle-like and wave-like properties, which cannot be accurately described by Newton's laws. This duality is better explained by quantum mechanics.
3. Heisenberg uncertainty principle: According to this principle, it is impossible to precisely determine an electron's position and momentum simultaneously. Newton's laws rely on exact knowledge of these quantities, which makes them unsuitable for analyzing electron motion at the quantum level.
In conclusion, Newton's laws are not ideal for analyzing electrons' motion due to the nature of quantum mechanics, wave-particle duality, and the Heisenberg uncertainty principle.
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Bonds that are formed between oxygen and hydrogen atoms within water molecules are called:________
a. polar covalent bonds. .
b. ionic bonds.
c. hydrogen bonds.
d. nonpolar covalent bonds.
Answers
Answer:
the bond between oxygen and hydrogen is polar covalent bonds
calculate the molar solubility of ca(oh)2 in 0.10 m ca(no3)2 (ksp= 1.3x10^-6) in pure water
Answers
Ca(OH)₂⇒ Ca²⁺ + 2OH⁻
s s 2s
Ksp = [Ca²⁺][OH⁻]²
Ca(NO₃)₂ ⇒ Ca²⁺ + 2NO₃⁻
0.1 M 0.1 0.2
Input in Ksp
1.3 x 10⁻⁶ = 0.1 . 4s²
s² = 3.25 x 10⁻⁶
s = 1.8 x 10⁻³
1.8 x 10⁻³ is the molar solubility. Solubility is the amount of a substance that can be dissolved in a liquid to form a solution.
What is solubility?Solubility is the amount of a substance that can be dissolved in a liquid to form a solution; it is typically represented as grammes of solute every litre of liquid. One fluid's (liquid or gas) solubility in another can be entire (e.g., methanol and water are completely miscible) or partial (e.g., oil and water barely mix). Generally speaking, "like dissolves like" (for instance, the aromatic hydrocarbons dissolves in one another but not in water).
A material's solubility in two solvents is measured by the distribution coefficient, which is used in some separation techniques (such as absorption and extraction). In general, as temperature rises, so do the dissolution rates of solids in liquids, while they fall as temperature rises and rise with pressure for gases.
Ca(OH)₂⇒ Ca²⁺ + 2OH⁻
s s 2s
Ksp = [Ca²⁺][OH⁻]²
Ca(NO₃)₂ ⇒ Ca²⁺ + 2NO₃⁻
0.1 M 0.1 0.2
1.3 x 10⁻⁶ = 0.1 . 4s²
s² = 3.25 x 10⁻⁶
s = 1.8 x 10⁻³
Therefore, 1.8 x 10⁻³ is the molar solubility.
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URGENT! Please help! Hi, I have to do a titration lab report using the Royal Society of Chemistry online titration lab. Please help me answer the following questions using the observation table I think?
Answers
Answer:
I'm sorry, but I cannot see the observations or the data table you mentioned in your question. However, I can still provide you with some general guidance on how to approach the calculations and answer the questions based on the given information.
4. To calculate the concentration of the NaOH solution, you need to know the mass of NaOH used and the volume of the solution. The formula to calculate concentration is:
Concentration (in mol/L) = (Mass of NaOH (in grams) / molar mass of NaOH) / Volume of solution (in L)
Make sure to convert the mass of NaOH to moles by dividing it by the molar mass of NaOH. The molar mass of NaOH is the sum of the atomic masses of sodium (Na), oxygen (O), and hydrogen (H).
5. The balanced equation for the neutralization reaction between NaOH and HCl is:
NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l)
(aq) represents an aqueous solution, and (l) represents a liquid.
6a. To calculate the average concentration of HCl in the sample from site B, you need to know the volumes and concentrations of the NaOH and HCl solutions used in the titration. Use the formula:
Concentration of HCl (in mol/L) = (Volume of NaOH solution (in L) * Concentration of NaOH (in mol/L)) / Volume of HCl solution (in L)
Multiply the volume of NaOH solution used by its concentration to find the amount of NaOH used. Then, divide this amount by the volume of HCl solution used to find the concentration of HCl.
6b. To determine the pH of the water at site B, you need to know the concentration of HCl from the previous calculation. The pH can be calculated using the formula:
pH = -log10[H+]
Since HCl is a strong acid, it dissociates completely into H+ ions. Therefore, the concentration of H+ ions is equal to the concentration of HCl. Take the negative logarithm (base 10) of the H+ concentration to find the pH.
To check if the water is safe, compare the calculated pH value to the range provided (pH 4.5-7.5). If the pH falls within this range, the water is considered safe for plant and animal reproduction in an aquatic environment.
6c. Use a similar calculation as in 6a to determine the average concentration of HCl in the sample from site C.
6d. Use the concentration of HCl from 6c to calculate the pH using the formula in 6b. Follow the same procedure to check if the water is safe based on the pH range.
7. To find the most current pH value for the Grand River, you can search for the latest data from reliable sources such as environmental agencies, research institutions, or government websites. Compare this pH value to the pH values obtained in the experiment to assess the difference between them.
Remember, without the specific data and observations, the calculations and comparisons provided here are only general guidelines. It's important to use the actual data from your experiment to obtain accurate results and conclusions.
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What are the reactants shown in this picture???
Answers
Answer:
CH3C OOH + NaHCO3
&
NaHCO3 + H2O
Explanation:
The reactants of a chemical equatuon are always on the left side, whilst the right side is the products of the equation.
where are the reproductive parts of plants located?leaves,flower,roots, stem
Answers
The reproductive part of plants is located in flowers.
The flowers are the reproductive part of a plant.
Stamens are the male reproductive part.
The pistil is the female reproductive part.
Process of reproduction in a plant:
Pollen is transferred from one flower to another by insects or the wind. Pollination is the name given to this procedure.When pollen enters a fresh flower, it moves to the ovary where it fuses the ovules, the egg cells that become seeds, to produce seeds.Animals or the wind can disperse the seeds.To know more about reproduction in a plant refer to:
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A set of solubility data is given below.
What is the mass of the dry solute
recovered?
Sample
2
Temperature
(°C)
30.1
Boat Mass
(8)
0.730
Boat +
Solution (g)
0.929
Boat + Dry
(g)
0.816
Answers
Answer:
0.086
Explanation:
got it on acellus
The mass of the dry solute recovered from the given data is 0.086 g. Option C
To determine the mass of the dry solute recovered, we need to subtract the mass of the boat from the mass of the boat with the dry solute.
Given the data provided:
Boat Mass: 0.730 g
Boat + Solution: 0.929 g
Boat + Dry: 0.816 g
To find the mass of the dry solute, we subtract the boat mass from the boat + dry mass:
Mass of Dry Solute = (Boat + Dry) - (Boat Mass)
Mass of Dry Solute = 0.816 g - 0.730 g
Mass of Dry Solute = 0.086 g
Therefore, the correct answer is c) 0.086 g.
The mass of the dry solute recovered from the given data is 0.086 g. It is important to note that the mass of the dry solute is obtained by subtracting the mass of the boat from the mass of the boat with the dry solute, as the boat mass represents the weight of the empty boat or container used in the experiment.
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Help me please!!
Two gas samples are stored in a container with a solid barrier separating the gases. Gas A is at 125 °C, and Gas B is at 80 °C.
What will occur when the solid barrier is removed?
The molecules of Gas A will collide and mix with Gas B molecules. Gas A and Gas B molecules will all speed up. The final temperature will be greater than 125 °C.
The molecules of Gas A will collide and mix with Gas B molecules. Gas A molecules will slow down, and Gas B molecules will speed up. The final temperature will be between 80 °C and 125 °C.
The molecules of Gas A will collide but not mix with Gas B molecules. There will be no changes in the temperature of either side of the container.
The molecules of Gas A will collide and mix with Gas B molecules. Gas A molecules will speed up, and Gas B molecules will slow down. The final temperature will be less than 80 °C.
Answers
4. Mendeleev created the first periodic table by arranging elements in order of
A. Decreasing atomic mass.
B. Increasing atomic mass.
C. increasing atomic number.
D. Increasing melting points and densities.
pls help
Answers
Answer:
c
Explanation:
C is the answer for increasing Atomic number
Question.04: (3mrks) A Manometer is a device to measure the pressure of an enclosed d gas sample. A common simple manometer consists of a U shaped tube of glass filled with some liquid. Typically, the liquid is mercury because of its high density. Incandescent light bulbs "burn out" because their tungsten filament evaporates, weakening the thin wire until it breaks. Argon gas is added inside the bulbs to reduce the rate of evaporation. (Argon is chosen because, as a nobi gas, it will not react with the components of the bulb, and because it is easy to obtain in significant quantities. It is the third most abundant element in air.) What is the pressure in atmospheres of 3.4 x 10-³ moles of argon gas in a 75mL incandescent light bulb at 20 °C?
Answers
The pressure of atmospheres of the argon gas in the given incandescent light bulb is 1. 1 .
How to find the pressure of atmospheres ?The pressure of atmospheres can be found by the formula :
= ( Number of moles x Universal gas constant x Temperature in Kelvin ) / Volume of gas
Number of moles = 3.4 x 10 ⁻³
Universal gas constant = 0. 082
Temperature in Kelvin = 20 + 273. 15 = 293. 15 K
Volume of gas : 75 x 10 ⁻³
The pressure of atmospheres of the argon gas is:
= ( 3.4 x 10 ⁻³ x 0. 082 x 293. 15 ) / 75 x 10 ⁻³
= 1. 1 atm
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a molecule made of carbon and oxygen atoms
Answers
Answer:
Carbon monoxide
Explanation:
The molecule has the carbon and oxygen atoms in equal amounts.
What mass of H2 forms when
35.25 g of Al reacts with excess
hydrochloric acid?
2AI+ 6HCI→ 2AlCl3 + 3H₂
Al: 26.98 g/mol
H₂: 2.02 g/mol
[?] g H₂
Answers
35.25/26.98 (mass reacted/molar mass of Al)
2) Find number of moles of H2 produced:
Number of mol. of Al x 3/2 (based on stoichiometry)
3) Find mass of H2 formed:
Number of mol. of H2 x molar mass of H2 = 3.9588mol = 4 mol (estimated value)
The its motion______ energy of an object is related to both the object's position and it's motion.
O A) kinetic
OB) potential
C) mechanical
Answers
Answer:
mechanical
Explanation:
cause mechanical energy is the sum of potential and kinetic enery
a.
Zn (s) + HCl (aq)
→ ZnCl2 (aq)
+ H2(g)
b. 2H20 (1)→ H2(g) + O2(g)
c. ALC3 (s) + H20 (1) → CH4 (g) + Al(OH)3 (s)
d. CH4 (g) + 2O2(g) → CO2 (g) + 2H20 (3)
Which chemical equation supports the law of conservation of mass
Answers
Answer:
CH₄ + 20₂ → CO₂ + 2H₂O
Explanation:
The reaction equation that supports the law of conservation of mass is the one in which the number of atoms on both sides of the expression are found to be the same.
The law of conservation of mass states that "in a chemical reaction, matter is neither created nor destroyed".
The reaction expressions are given as:
Zn + HCl → ZnCl₂ + H₂
2H₂O → H₂ + O₂
AlCl₃ + H₂O → CH₄ + Al(OH)₃
CH₄ + 20₂ → CO₂ + 2H₂O
In the highlighted reaction above:
Number of atoms
Reactants Products
C 1 1
H 4 4
O 4 4
While the composition of oxygen and nitrogen in air does not change with altitude, the decreasing temperature at high altitude does change the percent of air that is composed of H2O. Assuming constant relative humidity, which of the following can be asserted about the total grams of H2O in a given volume of air at 3000 m above sea level versus at sea level?
A. Assuming constant relative humidity means that air has roughly the same mass of H2O per unit volume at 3000 m above sea level.
B. Whether air at very high altitude has more or less mass of H2O per unit volume than it does at sea level depends on the temperature at high altitude.
C. Air has significantly more mass of H2O per unit volume at 3000 m above sea level.
D. Air has significantly less mass of H2O per unit volume at 3000 m above sea level.
Answers
The correct assertion is that whether air at very high altitude has more or less mass of H2O per unit volume than it does at sea level depends on the temperature at high altitude and the correct option is option B.
As the altitude increases, the temperature decreases. The amount of water vapor that air can hold is dependent on its temperature, with colder air being able to hold less moisture.
Therefore, at higher altitudes with lower temperatures, the air has a reduced capacity to hold water vapor. This means that the amount of water vapor in a given volume of air at high altitude will be less than at sea level, assuming constant relative humidity.
Thus, the ideal selection is option B.
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Which type of energy is supplied by fats
Answers
Answer:
A gram of fat supplies the body with about 9 calories, more than twice that supplied by proteins or carbohydrates. Because fats are such an efficient form of energy, the body stores any excess energy as fat.
Explanation:
I hope this helps!
how is pressure affected by force
Answers
How do big mountain ranges form?
Answers
Answer:
Large mountain ranges form when tectonic plates hit each other in a short process called plate tectonics, and then fasten, like the hood of a car.
Magnesium (Mg) has nine electrons. Which of the following shows the correct electron configuration for an atom of Mg?
2, 2, 5
7, 2
1, 8
2, 7
brailyist please help me
Answers
Answer:
2,7
Explanation:
Two in the first shell and 7 in the outer and last shell.
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EZ POINTS!!
Which of the following is not a mixture? lemonade fruit salad pure water cereal and milk
Answers
Answer:
pure water that's easy hope that helps
Calculate q, the heat released in each reaction.
Use the equation q = cmAT.
(Use c = 4.18 J/g °C and the total mass, m.)
Record to 2 significant figures.
Reaction 1: blank J
Reaction 2: blank J
Answers
The heat released in each reaction is:
Reaction 1: 3700J
Reaction 2: 3200J
What is heat?
Heat is a transfer of kinetic energy from one medium or object to another or from an energy source to a medium or object. A similar energy transfer can be done in three ways: radiation, conduction, and convection.The standard unit of heat in the International System of Units( SI) is the calorie( cal), which is the quantum of energy transferred needed to raise the temperature of one gram of pure liquid water by one degree Celsius, assuming that the temperature of the water is advanced. advanced than the freezing point and lower than the boiling pointTo know more about heat, click the link given below:
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How do you dissolve the solute in a supersaturated solution and keep the same concentration?
Question 1 options:
A-putting more solute
B-putting more solvent
C-heating the substance
D-letting it evaporate
Answers
A solution is a homogenous mixture of two or more pure substances whose composition can vary within certain limits. A solution generally consists of two components, they are called solute and solvent. The correct option is A.
A solution is called the supersaturated one which contains more dissolved solute than required for preparing the saturated solution and it is generally prepared by heating the saturated solution, adding more solute and then cooling it gently.
A supersaturated solution is unstable. Adding a small amount of the solute, a seed crystal will cause excess solute to rapidly precipitate or crystallize.
Thus the correct option is A.
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5. What is the overall charge of the electron cloud of the atom?Explain
Answers
The answer is: The overall charge of the electron cloud is negative,
Electron: Electron is a sub-atomic particle which is found outside the nucleus of an atom. The charge carried by an electron is negative.
What is the electron cloud and who suggest this idea?
Erwin Schrödinger developed electron cloud model.He suggested that atoms have a central nucleus made up of protons and neutrons. Around it is the "probability region" where electrons are most likely to be found. The higher the density, the more likely the electron will be found in this region. This dense probability region is called an electron cloud.As this region carries only negatively charged electrons, thus the overall charge of the electron cloud is negative.To learn more about electrons and electron cloud, visit:
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what are the reactants in the following equation: hcl(aq) nahco₃(aq)→ co₂(g) h₂o(l) nacl(aq)
Answers
Hydrogen chloride (HCl) and sodium bicarbonate (NaHCO3) are the reactants. The substances produced as a result of this reaction are CO2(g), H2O(l), and NaCl(aq).
The reactants in the following equation:
HCl (a q) + NaHCO3(a q) → CO2(g) + H2O(l) + Na C l (aq) are hydrogen chloride (HC l) and sodium bicarbonate (NaHCO3).
Explanation:
A reactant is a substance that undergoes change during a chemical reaction. A reaction equation includes the symbols and formulas of reactants and products, along with the physical states of the substances, as they appear before and after the reaction.
The chemical reaction in this question is: HC l(a q) + NaHCO3(a q) → CO2(g) + H2O(l) + Na Cl (a q)In this equation, the reactants are H Cl (a q) and NaHCO3(a q), which are in an aqueous state.
Therefore, hydrogen chloride (H Cl) and sodium bicarbonate (NaHCO3) are the reactants. The substances produced as a result of this reaction are CO2(g), H2O(l), and Na Cl (a q).
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definition of compounds
Answers
In the diagram below, what will allow more solute to be dissolved in the
solvent?
Answers
Answer:
missin a diagram buddy
Explanation:
Which of the following solutions has an osmolarity of 4.0?
Select one:
a. 3.0 M NaCl
O b. 2.0 M KBr
O C.
O d.
e.
1.0 M Fe₂O3
1.0 M MgCl₂
1.5 M AICI 3
Answers
The following solutions has an osmolarity of 4.0 is given as: 2.0 M KBr .
osmolarity = molarity × n ( number of dissociate particles)
a) 0.3 M NaCl
NaCl -----> Na + Cl
osmolarity = 0.3 × 2
= 0.2 osmol
b) 2.0 M KBr
KBr ---> K + Br
osmolarity = 2 × 2
= 4 osmol
c) 1.0 M Fe₂O₃
Fe₂O₃ -----> 2Fe³⁺ + 3O²⁻
osmolarity = 1 × 5
= 5 osmol
d) 1 M MgCl₂
MgCl₂ -----> Mg²⁺ + 2Cl⁻
osmolarity = 1 × 3
= 3 osmol
e) 1.5 M AlCl₃
AlCl₃ ----> Al³⁺ + 3Cl⁻
osmolarity = 1.5 × 4
= 6
Thus, The following solutions has an osmolarity of 4.0 is as: 2.0 M KBr .
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The density of air under ordinary conditions at 25°C is 1.19 g/L. How many kilograms of air is in a room that measures 11.0 ft x 12.0 ft and has a(n) 10.0 ft ceiling? 1 in =2.54 cm (exactly); 1 L = 10^3 cm^3?A. 45 x 10^4B. 0.1145C. 3.99D. 44.5E. 0.166
Answers
First, we define density as:
Density = mass/volume;
We focus first on the volume of air in the room.
Volume:
We have the measurements of where the air is.
We calculate the volume with these measurements, but first, we change the units to L:
1 inch = 2.54 cm
1 L = 10^3 cm^3
1 ft = 12 inch
Now,
11.0 ft x (12 in/1 ft) x (2.54 cm/1 in) = 335.28 cm
12.0 ft = 365.76 cm
10.0 ft = 304.8 cm
Therefore, the volume of the room = 335.28 cm x 365.76 cm x 304.8 cm
Volume = 37378237.5 cm^3 x (1 L/10^3cm^3) = 374 x 10^2 L
From the Density equation, we clear the mass:
Density x volume = mass (g)
1.19 g/L x 374x10^2 L = 445x10^2 g x (1 kg/1000 g) = 44.5 kg
Answer: 44.5 kg