Explanation:
PH3 has a lone pair(a pair of electrons that are not shared with other atoms) and has a trigonal pyramid. Therefore, PH3 is considered as a polar molecule.
How many moles of NaCl can be produced from 2.5 moles of BaCl_2.
mole = \(\frac{10}{36.5} =0.27\) moles = \(1.626*10^{23}\) molecules of HCl.
can you Explain the process of how clouds form?????
Answer: Clouds need two things to form: cool air and particles on which water vapor can condense. Clouds form as air cools. Cold air cannot hold as much water vapor, so the water vapor condenses. Water vapor condenses on small particles in the atmosphere, such as smoke, salt, and dust. As a result, clouds form.
Explanation: correct on edge
to find the density of stopper I weighted it and found its mass to 4.8g. After that I filled a graduated cylinder with 32.1mL of water. After adding the stopper, the water level rose to 39.2mL. What is the density of the stopper?
Answer:
0.68g/ml
Explanation:
The density of an object is its mass per unit volume. It is calculated using the formula
Density = mass / volume
Mass of stopper weighed = 4.8g
The volume of stopper can be got by subtracting the (volume of water) from the (volume of water+stopper) i.e.
= 39.2ml - 32.1ml
= 7.1ml
Volume of stopper = 7.1ml
Density of stopper= 4.8/7.1
Density= 0.676056
Therefore, the density of the stopper is 0.68g/ml
Homeostasis in a constantly changing environment is a process known as
Repeat these steps for a Carbon-14 nucleus. Describe the similarities and differences you see.
Explanation:
Explanation:
Nucleons can be either protons or neutrons contained in an atom, and since Carbon-14, has a mass number of 14, it is evident that it contains 14 nucleons, as the mass number of an element is the sum of the protons and neutrons of an element
A manufacturer advertises that a particular brand of lotion is “pH balanced” and that it has a pH equal to 6.25. What can you infer about the lotion based on the information in the ad?
We can infer about the given information of lotion is that pH is slightly acidic in nature.
What is pH?pH of any solution gives idea about the acidity or basicity of that solution, and it will be calculated as:
pH = -log[H⁺]
pH value in the range of 0 to 6.9 shows acidity, 7 shows the neutral nature and from 7.1 to 14 shows basicity. Given pH value of lotion i.e. 6.25 states that lotion is slightly acidic in nature.
Hence pH value of lotion informs that lotion is slightly acidic.
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. Which molecule has the largest overall dipole?
Answer:HF
Explanation:
HF has the largest dipole moment, you can tell which molecule has the largest by looking on the periodic table, they are usually the pair that are furthest from each other and it is also due to them having the biggest difference in electronegativity, usually the closer two elements are, the weaker the dipole moment.
7) How many molecules of CO2 are in 2.5 L at STP?
By using the ideal gas law and Avogadro's number, we find that there are approximately 6.72 × 10^22 molecules of CO2 in 2.5 L at STP.
To determine the number of molecules of CO2 in 2.5 L at STP (Standard Temperature and Pressure), we can use the ideal gas law and Avogadro's number.
Avogadro's number (N_A) is a fundamental constant representing the number of particles (atoms, molecules, ions) in one mole of substance. Its value is approximately 6.022 × 10^23 particles/mol.
STP conditions are defined as a temperature of 273.15 K (0 °C) and a pressure of 1 atmosphere (1 atm).
First, we need to convert the volume from liters to moles of CO2. To do this, we use the ideal gas law equation:
PV = nRT,
where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.
Since we have STP conditions, we can substitute the values:
(1 atm) × (2.5 L) = n × (0.0821 L·atm/(mol·K)) × (273.15 K).
Simplifying the equation:
2.5 = n × 22.4149.
Solving for n (the number of moles):
n = 2.5 / 22.4149 ≈ 0.1116 moles.
Next, we can calculate the number of molecules using Avogadro's number:
Number of molecules = n × N_A.
Number of molecules = 0.1116 moles × (6.022 × 10^23 particles/mol).
Number of molecules ≈ 6.72 × 10^22 molecules.
Therefore, there are approximately 6.72 × 10^22 molecules of CO2 in 2.5 L at STP.
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Ammonia, NH3 is a common base with Kb of 1.8 X 10-5. For a solution of 0.150 M NH3:
Write the equation for the ionization of ammonia in water.
List all species present in the solution AND determine the concentrations of each.
Determine the pH of this solution.
The concentrations : 0.15 M
pH=11.21
Further explanationThe ionization of ammonia in water :
NH₃+H₂O⇒NH₄OH
NH₃+H₂O⇒NH₄⁺ + OH⁻
The concentrations of all species present in the solution = 0.15 M
Kb=1.8 x 10⁻⁵
M=0.15
\(\tt [OH^-]=\sqrt{Kb.M}\\\\(OH^-]=\sqrt{1.8\times 10^{-5}\times 0.15}\\\\(OH^-]=\sqrt{2.7\times 10^{-6}}=1.64\times 10^{-3}\)
\(\tt pOH=-log[OH^-]\\\\pOH=3-log~1.64=2.79\\\\pH=14-2.79=11.21\)
Why is “C” incorrect? Choice D is the correct answer
Answer:
Explanation:
The question requires us to choose, among the options given, which one correctly presents the atom with higher first-ionization energy (between Cl and Ar) and the best justification.
The first-ionization energy of an atom in the gas form corresponds to the energy required to remove a first electron from its valence shell, forming a monovalent cation.
We can analyze the first ionization energy using the electron configuration of the atoms:
- Cl contains 17 electrons, thus its electron configuration is 1s2 2s2 2p6 3s2 3p5 (7 electrons in the valence shell)
- Ar contains 18 electrons, thus its electron configuration is 1s2 2s2 2p6 3s2 3p6 (8 electrons in the valence shell)
A swimming pool, 10.0 m by 4.0 m, is filled with water to a depth of 3.0 m at a temperature of 20.2°C.
If the energy needed to raise the temperature of the water to 27.3°C is obtained from the combustion of methane (CH4), what volume of methane, measured at STP,
must be burned?
AH combustion for CH4 = -891 kJ/mol
volume CH4 needed =
First, we need to determine the mass of water in the pool:
mass = density x volume
density of water = 1000 kg/m³
volume = length x width x depth
volume = 10.0 m x 4.0 m x 3.0 m = 120 m³
mass = 1000 kg/m³ x 120 m³ = 120000 kg
Next, we need to calculate the heat required to raise the temperature of the water:
q = m x c x ΔT
where q is the heat energy, m is the mass of water, c is the specific heat of water, and ΔT is the change in temperature.
c = 4.18 J/g°C (specific heat of water)
ΔT = 27.3°C - 20.2°C = 7.1°C
m = 120000 kg
q = 120000 kg x 4.18 J/g°C x 7.1°C = 35792400 J
Next, we need to convert the energy required to burn methane to heat energy:
-891 kJ/mol x (1 mol CH4/160 g CH4) x (1000 g/1 kg) = -5.569 kJ/g
We can now calculate the amount of methane needed:
energy = -5.569 kJ/g x mass CH4
mass CH4 = energy / (-5.569 kJ/g)
mass CH4 = 35792400 J / (-5569 J/g) = -6431.6 g
At STP, 1 mole of any gas occupies 22.4 L of volume. We can use this to convert the mass of methane to volume at STP:
1 mol CH4 = 16 g CH4
-6431.6 g CH4 x (1 mol CH4/16 g CH4) x (22.4 L/1 mol CH4) = -9074.4 L
Since we cannot have a negative volume, we can take the absolute value of the result:
|9074.4 L| = 9074 L
Therefore, approximately 9074 liters of methane gas at STP must be burned to raise the temperature of the water in the pool from 20.2°C to 27.3°C.
Whose work directly resulted in the development of an atomic model that has negative electrons stuck within a sea of positive material? Democritus Rutherford Thomson Dalton
Answer:
Thomson
Explanation:
Atomic models were proposed after the discovery of the atom and the sub-atomic particles. Thomson's model of the atom portrayed electrons stuck in the sea of protons. Thus, option C is correct.
What is Thomson's atomic model?J. J. Thomson proposed the model for atoms and their sub-atomic particles called electrons and protons. It was an important model that depicted the presence of the sub-atomic particles in the atom.
According to him, the electron had been known to carry a negative charge that was stuck in the soup or the sea of the positively charged protons. It resembled a plum cake that has electrons stuck in them as the cherries or the plum.
Therefore, the atomic model of the electron stuck in the sea of protons was given by J. J. Thomson.
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How are physical changes related to state of matter changes?
Answer:
Changes of state are physical changes. They occur when matter absorbs or loses energy. Processes in which matter changes between liquid and solid states are freezing and melting. Processes in which matter changes between liquid and gaseous states are vaporization, evaporation, and condensation.
hope this helped
Write the name or formula of these bases:
a. LiOH
b. Pb(OH)2
c. Manganese (III) hydroxide
The name or formula of the following bases are:
a. lithium oxide (LiOH)
b. lead hydroxide (Pb(OH)2)
c. manganese(III) hydroxide (Mg(OH)2)
What material makes up base?A base is a substance that interacts with an acid during an acid-base reaction.Throughout history, people have disagreed over how bases function. A base often either takes on a proton, releases a hydroxide anion when dissolved in water, or gives up an electron. Hydroxides and soap are a couple of examples of bases.How to write name or formula of bases?The names of bases are the same as those of other ionic substances. After the cation's name comes that of the anion.The formula for the hydroxide ion should be written after the symbol for the metal cation when writing the formulas for bases. Just like you would for any other ionic compound, balance the ionic charges.What kinds of bases are there?The three definitions of "base" used in chemistry are Arrhenius base, Bronsted base, and Lewis base. The fact that bases react with acids is acknowledged by all base definitions.To learn more about bases visit:
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I need a lil help here plzzzzzzzz
Answer:
The southern hemisphere is currently experiencing "Summer"
Explanation:
The Southern hemisphere is experiencing summer because it is closer to the sun than the Northern Hemisphere and also, direct light is more hotter than indirect light.
So, first, let's try an EXPERIMENT!
Take a VERY bright flashlight or a very small laser that can't harm you or just burn a paper in 1 second.
Then, take a piece of paper, or maybe just your skin, (like your hand) and place it under the light or laser, (for the laser, you should probably take the paper), and place the light source right above your skin, then, after some time, when it gets hot, measure the temperature. (around like 30 seconds later),
Note down the temperature...
Now, do the same thing, accept, do it in a very weird angle, face it towards your paper or hand, but, do it in an angle. More than like 30 degrees. Then, after some time, note down the temperature.
You probably, noticed, that the direct light (the one with the straight light facing your paper or skin, was hotter). Look at the image below, and you can understand better.
So, the same thing applies to the earth. The southern hemisphere in this picture is facing more directly to the sun than the northern hemisphere. That is why your answer is
SUMMERThank you! Please mark me Brianliest!
Remember to have fun, and a nice day!
Answer: summer
Explanation:
how does the earth compare in the orbital speed to the other planets?
1) Identify two different mineral nutrients present in the fertilizer
that helped the plant recover. Then, describe how each nutrient
benefits the plant.
The two different mineral elements that a fertilizer can contain are:
Phosphorus - build up of nucleic acid and ATPNitrogen- synthesis of proteinsWhat are fertilizers?Fertilizers are chemical substances added to the soil in order to improve crop growth and development.
Fertilizers are artificially made to contain mineral elements that are needed by the plants. Some of the mineral elements are as follows:
PhosphorusNitrogenPottasiumPhosphorus helps in the build up of nucleic acids and ATP for energy. Nitrogen is useful in the synthesis of proteins.Learn more about minerals at: https://brainly.com/question/18078524
Answer:
is the answer above right? im literally struggling rn
Explanation:
Question 11
Hydrogen peroxide (H₂O₂) and water (H₂O) both contain the elements Hydrogen and
Oxygen. Why are they different compounds?
Answer: Because
Explanation:
As you move down a group the electronegativity of an element will
Select all the statements that correctly describe the formation of sp hybrid orbitals. Check all that apply. The formation of sp hybrid orbitals leaves one unhybridized p orbital. An sp hybrid orbital is identical to an sp hybrid orbital in shape and energy. Three sp² hybrid orbitals are formed by the hybridization of one s and one p orbital. A group of sp hybrid orbitals assumes a trigonal planar geometry
a group of sp^2 hybrid orbitals assumes a trigonal planar geometry.the formation of sp^2 hybrid orbitals leaves one unhybridized valence p orbital.
How are sp hybrid orbitals made?1 s one and p atomic mix to produce sp hybridization, two s and two p atom orbitals mix to produce sp2 hybridization, and three s and 3 p atomic orbitals mix to produce sp3 hybridization.
What is the proper terminology for sp hybridization?One s orbital one and p orbital combine to generate two sp orbital angular momentum, each of which has 50% s character & 50% p character. This process is known as sp hybridization.Every time an atom is accompanied by 2 groups of electrons, this kind of hybridization is necessary.
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The concentration of an unknown protein sample was determined as 8.3 mg/ml. Calculate the concentration of the unknown protein in mM (millimolar) if: Average molecular mass of an amino acid = 118 g/mol The protein is 64 amino acids in length.
Based on the molar mass of the protein, the concentration of the unknown protein is 0.0011 mM (millimolar).
What is concentration?Concentration is the amount of a solute present in a given volume of substance.
Concentration = moles/volumeMoles of protein = mass/molar mass
molar mass of protein = 118 × 64 = 7552 g/mol
Moles of protein in 8.3 g = 8.3/7552 = 0.0011 moles
Concentration = 0.0011 mole/mL = 0.0011 mM.
Therefore, the concentration of the unknown protein is 0.0011 mM (millimolar).
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make a prediction about the boiling point of 1-pentanol, an alcohol with a molecular weight of 88 u. explain.
The boiling point of 1-pentanol (C5H11OH) is estimated to be around 138-140°C.
The alcohol molecules' intermolecular hydrogen bonds, which strengthen the forces keeping the molecules in a liquid state, are to blame for this.
The kinetic energy needed to rupture the intermolecular bonds and change the state of the material from liquid to gas is influenced by the molecular weight of 88 u, which also affects the boiling point. In addition, other elements like pressure and sample purity affect the boiling point.
The hydrogen bonds and molecular weight of 1-pentanol contribute to its boiling point. The forces that keep molecules in a liquid form are strengthened by hydrogen bonds, and the energy required to change a molecule from a liquid to a gas depends on its molecular weight.
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Calculate the amount of heat absorbed or released by the following substances: 90.23g of iron,
T = 86°C
Iron released 2.495 joules of heat.
To calculate the amount of heat absorbed or released by 90.23g of iron, we need to use the specific heat of iron and the change in temperature.
Iron has a specific heat capacity of 0.45 J/g °C, which means that it takes 0.45 Joules of energy to raise the temperature of 1 gram of iron by 1 degree Celsius.
First, we need to convert the mass of iron from grams to kilograms.
Iron mass = 90.23 g = 0.09023 kg
Now we need to calculate the temperature change. The initial temperature of the iron is T = 86°C, but the final temperature is unknown. Assuming that the iron undergoes a process that neither loses nor gains heat through the environment, the following equation can be used.
heat absorbed = heat released
This means that the amount of heat absorbed by iron is equal to the amount of heat given off by the environment. So you can use the following formula:
Heat absorption = mass x specific heat capacity x temperature change
Since there is no heat loss or gain to the environment, we can assume that the temperature of the environment is constant at 25°C. So the temperature change is:
temperature change = final temperature - initial temperature
Temperature change = 25°C - 86°C
Temperature change = -61°C
Note that the temperature change is negative because iron loses heat.
Now you can insert the value.
Heat absorbed = 0.09023 kg × 0.45 J/g °C × (-61 °C)
heat absorbed = -2.495 J
Since the value is negative, this indicates that the iron lost heat to the environment and the environment gained heat.
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what classifies materials as a pure substance or a mixture
Answer:
A pure substance is a form of matter that has a constant composition and properties that are constant throughout the sample. Mixtures are physical combinations of two or more elements and/or compounds.
PLEASE HELP!!!!!!!!!!!!!!!!!! Oxygen is in the 16th period, and should therefore have a 2- charge. peroxide also has a charge of 2-. Are they supposed to have the same charge? If so in nomenclature, how do I choose which one to use?
Each oxygen atom in peroxide compounds like hydrogen peroxide (H2O2) has an additional electron that it shares with the other oxygen atom in the compound, giving the oxygen a charge of -1.
What is a compound?Any substance comprised of two or more elements that are chemically linked together is known as a compound. A compound's constituent parts are always present in a specific ratio. As an illustration, the substance water (H2O) consists of two hydrogen atoms that are chemically bound to one oxygen atom.
Actually, oxygen belongs to the second period of the periodic table. It can create two covalent bonds with other elements to complete its octet and has six valence electrons.
Each oxygen atom in peroxide molecules like hydrogen peroxide (H2O2) has a charge of -1. This is due to the fact that each oxygen atom in the molecule has an additional electron that it shares with another oxygen atom.
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A student examines the effect of the number of D batteries in a closed circuit on the brightness of a light bulb. In the experiment, four circuits were built with 1, 2, 3, and 4 batteries respectively. For each trial, the brightness of the light bulb was measured using a light meter. Which variable should the student keep constant?
Answer: The type of batteries
Explanation: Your testing the brightness of the bulb nothing has anything to do with the batteries
An atomic cation with a charge of +1 has the following electron configuration:
1s 2s 2p 3s 3p 3d ¹4s¹
What is the chemical symbol for the ion?
How many electrons does the ion have?
How many 3p electrons are in the ion?
A) The chemical symbol for the ion is Fe+
B) It has 20 electrons in total, and there are 6 3p electrons in the ion.
C) There are 6 electrons present in the 3p orbital.
The atomic cation with the given electron configuration is represented by the chemical symbol Fe+.
To determine the number of electrons in the ion, we need to count the electrons present in the electron configuration. In the given configuration, we can see that the 1s orbital has 2 electrons, the 2s orbital has 2 electrons, the 2p orbital has 6 electrons, the 3s orbital has 2 electrons, the 3p orbital has 6 electrons, the 3d orbital has 1 electron, and the 4s orbital has 1 electron. Adding up these numbers, we have:
2 + 2 + 6 + 2 + 6 + 1 + 1 = 20
Therefore, the ion has 20 electrons.
To determine the number of 3p electrons in the ion, we look at the 3p orbital. In this case, there are 6 electrons present in the 3p orbital.
In summary, the chemical symbol for the ion is Fe+, it has 20 electrons in total, and there are 6 3p electrons in the ion.
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How do robots help scientists to perform experiments?
A.Robots go places humans are unable to go.
B.Robots are smarter than humans.
C.Robots increase the risk of an experiment.
D.Robots slow down data acquisition.
Answer:
A. Robots go places humans are unable to go.
3. Lily is studying the core of Earth. Which sphere is she examining?
biosphere
atmosphere
hydrosphere
lithosphere
Answer:
D: lithosphere
H3PO4(aq)+KOH(aq)→
Express your answer as a chemical equation. Identify all of the phases in your answer.
Answer:
H3PO4(aq) +3KOH(aq) --> K3PO4 (aq) + 3H2O (l)
Explanation:
KOH + \(H_{3} PO_{4}\)→ \(K_{3} PO_{4}\) + \(H_{2}O\) We have a double replacement reaction for this reaction.
What is meant by double displacement reaction?In a double displacement reaction, two chemicals react and the positive (cation) and negative (anion) ions of the two reactants swap positions, creating two new compounds or products.
Thus, KOH + \(H_{3} PO_{4}\)→ \(K_{3} PO_{4}\) + \(H_{2}O\) We have a double replacement reaction for this reaction.
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