Which forces can be classified as intramolecular?
London dispersion forces
van der Waals forces
hydrogen bonds
covalent bonds
Answer:
D) Covalent Bonds
Explanation:
Quizlet says so
Among the given options the intramolecular force is covalent bonding. Covalent bond is formed between two nonmetals by sharing of electrons. All other given forces are intermolecular.
What is covalent bonding ?A covalent bond is formed between two non-metals through sharing of valence electrons between atoms. For example carbon and oxygen are non metals forming the covalent compound CO.
The number of shared pair of electron depends on the valence of each atoms. For example in HCl, both atoms shares one electron to each other.
In a covalent compound, if the difference in electronegativity between two atoms is significant, the shared pair of electrons attracts towards the highly electronegative atom and resulting charge separation make them polar compounds.
Find more on covalent compounds:
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For a substance to change phases, the amount of internal energy must change. Water exists in three phases: liquid, solid (ice), and gas (water vapor) Which of the following lists the phases in order of increasing total energ/?
gas, liquid, solid
O solid, gas, liquid
o solid, liquid, gas
O liquid, gas, solid
Answer:
Solid, liquid, gas
Explanation:
add thermal energy to solid and it becomes liquid, add thermal energy to liquid it becomes gas
In the following reaction, which species is reduced? Au(s) + 3NO3-(aq) + 6H+(aq) → Au3+(aq) + NO(g) + 3H2O (l) H+ N+5 O2- H2O Au
Answer:
NO3-
Explanation:
Given the reaction equation;
Au(s) + 3NO3-(aq) + 6H+(aq)→Au3+(aq) + 3NO2(g) + 3H2O (l).
We can consider the oxidation states of species on the left and right hand sides of the reaction equation;
Au is in zero oxidation state on the left hand side and an oxidation state of +3 on the righthand side.
NO3- is in oxidation state of +5 on the righthand side and NO2 is in + 4 oxidation state.
H+ is in + 1 oxidation state on both the left and right hand sides of the reaction equation.
Since reduction has to do with a decrease in oxidation number, it follows that NO3- was reduced in the reaction.
A chemical compound has a molecular weight of 89.05 g/mole. 1.400 grams of this compound underwent complete combustion under constant pressure conditions in a special calorimeter. This calorimeter had a heat capacity of 2980 J °C.1 (Note that the calorimeter was made of a metal shell, a water "substitute" - a special oil, and a thermocouple). The temperature went up by 11.95 degrees.
Required:
Calculate the molar heat of combustion of the compound.
Answer:
[tex]\Delta _{comb}H=-2,265\frac{kJ}{mol}[/tex]
Explanation:
Hello!
In this case, for such calorimetry problem, we can notice that the combustion of the compound releases the heat which causes the increase of the temperature by 11.95 °C, it means that we can write:
[tex]Q _{comb}=-C_{calorimeter}\Delta T_{calorimeter}[/tex]
In such a way, we can compute the total released heat due to the combustion considering the calorimeter specific heat and the temperature raise:
[tex]Q _{comb}=-2980\frac{J}{\°C} *11.95\°C\\\\Q _{comb}=-35,611J[/tex]
Next, we compute the molar heat of combustion of the compound by dividing by the moles, considering 1.400 g were combusted:
[tex]n=1.400g*\frac{1mol}{89.05g} =0.01572mol[/tex]
Thus, we obtain:
[tex]\Delta _{comb}H=\frac{Q_{comb}}{n}=\frac{-35,611J}{0.01572mol} \\\\\Delta _{comb}H=-2,265,331\frac{J}{mol}*\frac{1kJ}{1000J} \\\\\Delta _{comb}H=-2,265\frac{kJ}{mol}[/tex]
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Which equation is balanced using the correct formulas and coefficients?
A. NaCl2 + F2 → NaF2 + Cl2
B. 2 NaCl + F2 → NaF + Cl2
C. 2 NaCl + F2 → 2 NaF + Cl2
D. O NaCl + F → NaF + CI
Answer:
answer is gonna be B
Explanation:
NaCl+F2= NaF+Cl2
In order for photosynthesis to take place
what must be present?
Answer:
For photosynthesis to take place, plants need to take in carbon dioxide (from the air), water (from the ground) and light (usually from the sun)
Explanation:
Answer:
water carbon dioxide sunlight and the plant
Explanation:
Which of the following are most reactive?
1) Describe the appearance of each of the three curves on your graph.
Answer:PROCESSING THE DATA To analyze the relationship between conductivity and volume, use this method to calculate the linear-regression statistics for your data. Then plot the linear regression curve on your graph. Note the conductivity of pure water: 0 uS/cm Conductivity Data Table Drops 1M NaCl(aq) 1M CaCl2(ag) (uS/cm) (uS/cm) 1 150 uS/cm 110 uS/cm 2 280 uS/cm 155 uS/cm 405 uS/cm 245 uS/cm 4 516 uS/cm 340 uS/cm 3 Use 1 mL = 20 drops to Plot Conductivity (in the y axis) vs. volume of each salt solution (x axis). Do a best fit straight line through these points. Make sure to use the pure water conductivity as your zero drop. On this same graph determine the slope for both the NaCl and CaCl2, make sure to use pure water as your 0 drop. Sketch your prediction of what you would expect the AlCl3 drops to look like.
Explanation:
QUICK! Which best explains how the collisions of materials in space contribute to the formation of layers in protoplanets?
A: The materials undergo decay when they collide, which results in the heating and subsequent melting and rising of materials.
B: The collisions release heat, which results in the heating and subsequent melting, sinking, and rising of materials.
C: The materials undergo decay when they collide, which results in the cooling and subsequent hardening and sinking of materials.
D: The collisions absorb heat, which results in the cooling and subsequent hardening and rising of materials.
Answer:
B. The collisions release heat, which results in the heating and subsequent melting, sinking, and rising of materials.
Explanation:
Got it correct on edge
Answer:
the answer is B: The collisions release heat, which results in the heating and subsequent melting, sinking, and rising of materials.
Explanation:
I took the test
1. Which liquid sample is a pure substance?
Table 1: Boning point of the samples
Samples Temperature Observation while heating
Liquid A
Liquid B
2. Which soăc sample is a pure substance?
Scenario 1: Meiting point of the said samples
Samples Appearance Observation while melting
Solid
Solid B
The whole Activity , poem and paragraph is missing in the question.
Answer:
(1) Liquid A
(2) Solid A
Explanation:
Using this part of the given poem
Substances and mixtures behave differently,
During boiling and melting most especially
Boiling point of substance is fixed while mixture is not
Substance melts completely but mixture does not
The boiling point of the Pure substance remain fixed after reaching its boiling point this is shown by Liquid A
Solid A is melting completely so Solid A is a pure substance.
Which of the following statements is true? Fusion breaks apart nuclei; fission puts them together. Fission breaks apart nuclei; fusion puts them together. Fission and fusion have identical reactions.
Answers:
Fission breaks apart nuclei
Fusion puts them together.
======================================================
Explanation:
The term "fission" is related to the term "fissure" which means "a cut or divide", often describing a geologic feature of the earth (eg: a crack in the rock).
Fusion is the idea of putting things together, which is the opposite of fission. The term doesn't have to apply to nuclear fusion. It could be something like the fusing of two ideas to create one new idea.
Answer:
the 2nd one
Explanation:
The average titration volume of the 0.09876 M NaOH used in back titration is 29.59
ml. Calculate the number of mmoles of HCl in the 250 ml volumetric flask.
Answer:
The number of moles of HCl in the 250 mL volumetric flask is 0.003 moles
Explanation:
Firstly, we solve for the concentration of acid using the formula
CaVa/CbVb = nₐ/nb
where Ca is the concentration of acid
Cb is the concentration of base
Va is the volume of acid
Vb is the volume of base
nₐ is the number of moles of acid (from the equation)
nb is the number of moles of base (from the equation)
Ca × 250/0.09876 × 29.59 = 1/1
Ca = 0.09876 × 29.59/250
Ca = 0.012 M
To determine the number of moles of HCl acid present in the 250 ml volumetric flask, the formula for molarity is used
Molarity = number of moles ÷ volume (in liter or dm³)
Volume needs to be converted to liter; 250 ml ⇒ 0.25 L
Molarity of the acid is 0.012 M
From the formula above, number of moles = molarity × volume (in liter)
number of moles = 0.012 × 0.25
number of moles of acid = 0.003 moles
Fove seconds without gravity would be detrimental to earth.
A.True
B.False
Answer:true
Explanation:
Name the following compounds
Answer:
What are the compounds
Explanation:
Answer:
Where is the picture?
Explanation:
Suppose 215 g of NO3- flows into a swamp each day. What volume of CO2 would be produced each day at 17.0°C and 1.00 atm?
Answer:
The answer is "[tex]41.23 \ L\ N_2[/tex]"
Explanation:
[tex]2 NO_3^{-} + 10 e^{-} + 12 H^{+} \longrightarrow N_2 + 6 H_2O\\\\= \frac{( 215 \ g \ NO_3^{-})}{(62.0049 \frac{\ g NO_3^{-}}{mol})} \times \frac{(1 \ mol \ N_2}{ 2 \ mol \ NO_3^{-})}\\\\[/tex]
[tex]=3.46746789 \times 0.5\\\\= 1.733 \ mol \ N_2 \\\\\to V = \frac{nRT}{P} \\\\= (1.733 \ mol) \times (0.08205746 \frac{L\ atm}{Kmol}) \times \frac{ (17 + 273) K}{(1.00 atm)}\\\\= 41.23[/tex]
The volume of CO2 is 206.27 L
The ideal gas equation is used to determine the volume, pressure, temperature, or number of moles. It can be mathematically expressed as:
PV = nRT
From the given information:
The equation for the reaction can be expressed as:
[tex]\mathbf{2NO_3^-_{(aq)} + 5CO_{(g)} + 2H^+_{(aq)} \to N_2{(g)} + 5CO_2_{(g)} + H_2O_{(l)}}[/tex]
The mass of NO₃⁻ = 215 gThe temperature = 17.0°C = (273 + 17) = 290 KPressure = 1.00 atmThe number of moles of CO2 from the reaction is;
[tex]\mathbf{= \dfrac{215 \ g}{62.0049} \times \dfrac{5 \ mol \ of \ CO_2}{2 \ mol \ of \ NO_3^-} }[/tex]
[tex]\mathbf{= 8.669 \ moles \ of \ CO_2 }[/tex]
From ideal gas, by making the volume the subject of the, we have:
The volume of CO₂ [tex]\mathbf{V= \dfrac{nRT}{P}}[/tex]
[tex]\mathbf{V= \dfrac{8.669 \ moles \times 0.08205 L atm/ kmol \times 290\ K}{1 \ atm }}[/tex]
[tex]\mathbf{V= 206.27 \ L \ of \ CO_2 \ gas}[/tex]
Learn more about the volume of CO2 gas here 206.27 L
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Can someone please tell me the answer
Answer:
52.068 amu
Explanation:
To calculate the average atomic mass of chromium, you have to first multiply the abundance of an isotope with its mass.
49.946 × 0.0435 = 2.173
51.941 × 0.838 = 43.527
52.941 × 0.0235 = 1.244
53.939 × 0.095 = 5.124
Next, add up all of the values, and you will get the average atomic mass.
2.173 + 45.527 + 1.244 + 5.124 = 52.068 amu
The ratio of effusion ratios between He(g) and SF6(g) is
rate He = 6 x rate SF₆
Further explanationGraham's law: the rate of effusion of a gas is inversely proportional to the square root of its molar masses or
the effusion rates of two gases = the square root of the inverse of their molar masses:
[tex]\rm \dfrac{r_1}{r_2}=\sqrt{\dfrac{M_2}{M_1} }[/tex]
or
[tex]\rm M_1\times r_1^2=M_2\times r_2^2[/tex]
M He = 4 g/mol
M SF₆ = 146 g/mol
[tex]\tt \dfrac{r_{He}}{r_{SF_6}}=\sqrt{\dfrac{146}{4} }=6.04\approx 6\\\\r_{He}=6~r_{SF_6}[/tex]
Which is the average kinetic energy of the individual particles of a substance?
Answer: Temperature
Explanation: Temperature is a measure of average kinetic energy of particles in an object. The hotter the substance, higher is the average kinetic energy of its constituent particles. When we heat a substance, the particles that constitute the substance gain some energy and begin to move faster.
When 100.0 mL of 1.000 M HCl is reacted with 100.0 mL of 1.000 M NH4OH, the solution’s temperature increases 7.01 °C. Calculate LaTeX: \DeltaΔHreaction in units of kJ/mol. The specific heat of the salt solution is 4.184 J/g-°C and the density is 1.010 g/mL.
Do not use units or labels in answer. Make sure answer has the correct sig figs.
Answer:
Explanation:
volume of solution = 100 + 100 = 200 mL
mass of reaction mixture = 200 x 1.010 = 202 g
specific heat of solution mixture = 4.184 J/g-°C
heat evolved = mass x specific heat x rise in temperature
= 202 x 4.184 x 7.01
= 5924.63 J
100 mL of 1 M HCl
= .1 L of 1M HCl will contain .1 mole of HCl
.1 mole reacts with .1 mole of NH₄OH to make 5924.63 J of heat
1 mole reacts with 1 mole of NH₄OH to make 59246.3 J of heat
heat of reaction = 59246.3 J / mol
= 59.246 kJ / mol
= 59.3 kJ / mol .
1)
Radioactive materials have unstable
A)
nuclei
B)
electrons.
Delectron clouds.
D)
area of atom outside of nucleus.
In a car engine gasoline is burning to create mechanical energy which of the following statements is true? A. Some energy is lost as heat B. the total amount of energy in the system increases C. the total amount of energy in the system degrees D. the nuclear energy is transformed into mechanical energy
Answer:
Some energy is lost as heat
Explanation:
It is correct to say that as the gasoline is converted to mechanical energy in the automobile engine, some of the energy is lost as heat.
Heat energy is on of the ways energy is lost in any system. The movement of mechanical parts and even the combustion of the gasoline produces heat energy.
These energy are usually lost to the environment.
i need help with this
Answer: B
Explanation: Most of the time they form over oceans which bring cool and moist weather.
Reactant A illustrates an example of which of the following?
Answer: molecules of an element
The diagram shown in the A section shows molecules of an element because they all look the same, and they are in circular shape.
- Best of Luck!
Roger has a car that accelerates at 5 m/s2. If the car has a mass 0f 1000 kg, how much force does the car produce?
Answer:
The answer is 5000 NExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × acceleration
From the question we have
force = 1000 × 5
We have the final answer as
5000 NHope this helps you
Answer:
5OOON
Explanation:
IM SMARTTT
What process that occurred in the Midwestern United States in the 1930s is now occurring in the Sahel region of Africa, south of the Sahara Desert?
Industrial pollution
Radioactive soil
Over fertilization of streams
Dust storms and desertification
Answer:
dust storms and desertification
Explanation:
Answer:
Dust storms and desertification
Explanation:
Electrons _______ around the nucleus of an atom.
Options:
- valence electrons
- atomic number
- atomic mass
- amu - atomic mass unit
- ionization energy
- electronegativity
- ionic bond
- covalent bond
- metallic bond
Answer:
Orbit/Orbital
Explanation:
Elections orbit around the nucleus of an atom.
Consider the atom with the chemical symbol Ru.
What would be the mass number for an atom of Ru which has
52 neutrons?
Answer:
96.
Explanation:
equation for the oxidation of octane.
Answer:
I think its 2 C8H18 + 25 O2 = 18 H2O + 16 CO2
Im not sure!
Explanation:
Other than a base and a sugar unit, which of the following is a component of a nucleotide?
A. sulfate group
B. nitrate group
C. phosphate group
D. carbonate group
Answer:
C. phosphate group
Explanation:
took quiz on edg
Answer:
C
Explanation:
EDGE 2022
A sample of 18.0 g of O2 has a temperature of 350 K, and pressure of 0.720 atm. What is the volume of the sample?
Answer:
V = 22.36 L
Explanation:
Given data:
Mass of oxygen = 18.0 g
Temperature = 350 K
Pressure = 0.720 atm
Volume of gas = ?
Solution:
Number of moles of oxygen :
Number of moles = mass/molar mass
Number of moles = 18.0 g/ 32 g/mol
Number of moles = 0.56 mol
Volume of oxygen:
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
0.720 atm × V = 0.56 mol × 0.0821 atm.L/ mol.K × 350 K
V = 16.1 atm.L /0.720 atm
V = 22.36 L