-173.15
-0.15
-267.15
416.15
846.15
assuming k is kelvins and c is celsius
1. -173.15°c
2. -0.15°c
3. -267.15°c
4. 416.15k
5. 846.15k
how many moles of silver atoms are in 1.8X10^20 atoms of silver?
A. 3.0X10^-4
B. 3.3X10^-3
C. 3.0X10^2
D. 1.1X10^44
#19 in photo
PLEASE ADD WORK AND EXPLANATION
Answer:
3.0 x 10⁻⁴ moles
Explanation:
Given parameters:
Amount of Ag atoms = 1.8 x 10²⁰ atoms
Unknown:
Number of moles of Ag atoms
Solution:
From mole concept, we know that a mole of a substance contains Avogadros number of particles.
The Avogadro's number of particles is 6.02 x 10²³.
Now:
Number of moles
= number of particles/6.02 x 10²³
Therefore:
Number of moles= 1.8 x 10²⁰ / 6.02 x 10²³
Number of moles = 0.3 x 10⁻³ moles
= 3.0 x 10⁻⁴ moles
Taking into account the definition of avogadro's number, the correct answer is option A. 3×10⁻⁴ moles of silver are 1.8×10²⁰ atoms of silver.
Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.
Then you can apply the following rule of three: if 6.023×10²³ atoms are contained in 1 mole of silver, then 1.8×10²⁰ atoms are contained in how many moles of silver?
amount of moles of silver= (1.8×10²⁰ atoms × 1 mole)÷ 6.023×10²³ atoms
amount of moles of silver≅ 3×10⁻⁴ moles
Finally, the correct answer is option A. 3×10⁻⁴ moles of silver are 1.8×10²⁰ atoms of silver.
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Which of these is not an environmental effect of deforestation? overcrowding flooding smog soil erosion
Answer:
Soil
Explanation:
Overcrowding is not considered as environmental effect of deforestation.
Explanation:Trees provide various advantages to the living beings. It acts as shelter to animal, birds and human beings. It provides various raw materials for the industry. Apart from this it checks the flooding, prevents soil erosion and protects the environment from smog formation.
Deforestation refers to the process in which many trees are uprooted and destroyed. When trees are harmed it leads to stoppage of advantage caused by them. Overcrowding is not considered as environmental effect of deforestation as it has no relationship with deforestation.
Which of the following statements about enthalpy is true?
Enthalpy of a substance can be measured directly.
A chemical process must occur and then changes between the state of the reactants and the state of the products can be determined.
Enthalpy is the gradual decline into disorder.
Enthalpy is a measure of the change in pressure of a system.
Answer: A chemical process must occur and then changes between the state of the reactants and the state of the products can be determined
Explanation: Enthalpy represents the sum of the energy of the system with the product of the pressure and volume of that system. As a thermodynamic property, it expresses the ability to release heat from the system. In fact, enthalpy tells us how much heat and work has changed during the chemical reaction under constant pressure. When measuring, measurements of the difference in enthalpy between the two states of the system is performed, before and after the chemical reaction, since total enthalpy can not be measured. This measurement of the enthalpy change can tell us, for example, whether the heat was released from the system during the reaction, or the system absorbed the heat.
Answer:
B.
Explanation:
what are crystalline solids
Answer:
A solid material whose constituents (such as atoms, molecules, or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.
Explanation:
Solids that have a regular and three-dimensional arrangement of constituent particles such as (atoms, molecules, or ions) are known as crystalline solids. A few examples of crystalline solids include sodium chloride, quartz, diamond, etc. There are four types of crystals:
ionic , metallic , covalent network,molecularIn crystalline solids, particles are arranged in a repeating pattern. They have a regular and ordered arrangement resulting in a definite shape.
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Of the following reactions, which is a fission reaction?
a. hydrogen-2 and hydrogen-3 combining to form a helium-4 atom and a neutron
b. carbon-12 and hydrogen-1 combining to form a nitrogen-13 atom
c. uranium-235 absorbing a neutron and splitting into barium-141, krypton-92, and three neutrons
d. a glucose molecule being metabolized with oxygen into carbon dioxide and water
Answer:
it's c
Explanation:
The fission reaction is uranium-235 absorbing a neutron and splitting into barium-141, krypton-92, and three neutrons. Therefore, option C is correct.
What do you mean by fission reactions ?When a neutron collides with a larger atom, it causes it to excite and split into two smaller atoms, which are known as fission products. Additional neutrons are released, which can set off a chain reaction. A tremendous amount of energy is released when each atom splits.
The splitting of uranium-235 or plutonium-239 to release a large amount of energy. A lot of energy, two smaller atoms, and three neutrons.
Thus, The fission reaction is uranium-235 absorbing a neutron and splitting into barium-141, krypton-92, and three neutrons, option C is correct.
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20 elements of the periodic table
Answer:
Explanation:
Hydrogen is a nonmetallic, colorless gas under ordinary conditions. It becomes an alkali metal under extreme pressure.
Atomic Number: 1
Symbol: H
Atomic Mass: 1.008
Electron Configuration: 1s1
Group: group 1, s-block, nonmetal
Helium is a light, colorless gas that forms a colorless liquid.
Atomic Number: 2
Symbol: He
Atomic Mass: 4.002602(2)
Electron Configuration: 1s2
Group: group 18, s-block, noble gas
Lithium is a reactive silver metal.
Atomic Number: 3
Symbol: Li
Atomic Mass: 6.94 (6.938–6.997)
Electron Configuration: [He] 2s1
Group: group 1, s-block, alkali metal
Beryllium is a shiny gray-white metal.
Atomic Number: 4
Symbol: Be
Atomic Mass: 9.0121831(5)
Electron Configuration: [He] 2s2
Group: group 2, s-block, alkaline earth metal
Boron is a gray solid with a metallic luster.
Atomic Number: 5
Symbol: B
Atomic Mass: 10.81 (10.806–10.821)
Electron Configuration: [He] 2s2 2p1
Group: group 13, p-block, metalloid
Carbon takes several forms. It's usually a gray or black solid, although diamonds may be colorless.
Atomic Number: 6
Symbol: C
Atomic Mass: 12.011 (12.0096–12.0116)
Electron Configuration: [He] 2s2 2p2
Group: group 14, p-block, usually a nonmetal although sometimes considered a metalloid
Nitrogen is a colorless gas under ordinary conditions. It cools to form a colorless liquid and solid forms.
Atomic Number: 7
Symbol: N
Atomic Mass: 14.007
Electron Configuration: [He] 2s2 2p3
Group: group 15 (pnictogens), p-block, nonmetal
Oxygen is a colorless gas. Its liquid is blue. Solid oxygen may be any of several colors, including red, black, and metallic.
Atomic Number: 8
Symbol: O
Atomic Mass: 15.999 or 16.00
Electron Configuration: [He] 2s2 2p4
Group: group 16 (chalcogens), p-block, nonmetal
Fluorine is a pale yellow gas and liquid and bright yellow solid. The solid may be either opaque or translucent.
Atomic Number: 9
Symbol: F
Atomic Mass: 18.998403163(6)
Electron Configuration: [He] 2s2 2p5
Group: group 17, p-block, halogen
Neon is a colorless gas that emits a characteristic orange-red glow when excited in an electric field.
Atomic Number: 10
Symbol: Ne
Atomic Mass: 20.1797(6)
Electron Configuration: [He] 2s2 2p6
Group: group 18, p-block, noble gas
Sodium is a soft, silvery-white metal.
Atomic Number: 11
Symbol: Na
Atomic Mass: 22.98976928(2)
Electron Configuration: [Ne] 3s1
Group: group 1, s-block, alkali metal
Magnesium is a shiny gray metal.
Atomic Number: 12
Symbol: Mg
Atomic Mass: 24.305
Electron Configuration: [Ne] 3s2
Group: group 2, s-block, alkaline earth metal
Aluminum is a soft, silver-colored, nonmagnetic metal.
Atomic Number: 13
Symbol: Al
Atomic Mass: 26.9815385(7)
Electron Configuration: [Ne] 3s2 3p1
Group: group 13, p-block, considered a post-transition metal or sometimes a metalloid
Silicon is a hard, blue-gray crystalline solid that has a metallic luster.
Atomic Number: 14
Symbol: Si
Atomic Mass: 28.085
Electron Configuration: [Ne] 3s2 3p2
Group: group 14 (carbon group), p-block, metalloid
Phosphorus is a solid under ordinary conditions, but it takes several forms. The most common are white phosphorus and red phosphorus.
Atomic Number: 15
Symbol: P
Atomic Mass: 30.973761998(5)
Electron Configuration: [Ne] 3s2 3p3
Group: group 15 (pnictogens), p-block, usually considered a nonmetal, but sometimes a metalloid
Sulfur is a yellow solid.
Atomic Number: 16
Symbol: S
Atomic Mass: 32.06
Electron Configuration: [Ne] 3s2 3p4
Group: group 16 (chalcogens), p-block, nonmetal
Chlorine is a pale yellow-green gas under ordinary conditions. Its liquid form is bright yellow.
Atomic Number: 17
Symbol: Cl
Atomic Mass: 35.45
Electron Configuration: [Ne] 3s2 3p5
Group: group 17, p-block, halogen
Argon is a colorless gas, liquid, and solid. It emits a bright lilac-purple glow when excited in an electric field.
Atomic Number: 18
Symbol: Ar
Atomic Mass: 39.948(1)
Electron Configuration: [Ne] 3s2 3p6
Group: group 18, p-block, noble gas
Potassium is a reactive, silvery metal.
Atomic Number: 19
Symbol: K
Atomic Mass: 39.0983(1)
Electron Configuration: [Ar] 4s1
Group: group 1, s-block, alkali metal
Calcium is a dull silver metal with a faint yellowish cast.
Atomic Number: 20
Symbol: Ca
Atomic Mass: 40.078(4)
Electron Configuration: [Ar] 4s2
Group: group 2, s-block, alkaline earth metal
Hope That Helps!
Brainliest?
(the other person copied it from Google).
What is the mass of 3.2 moles of h2O ?
Answer:
[tex]\boxed{\text{57.7 g} }[/tex]
Explanation:
The first step is to calculate the molar mass of H₂O:
[tex]\begin{array}{rcr}\text{2 H} & = & 2.02\\\text{1 O} & = & 16.00\\\text{TOTAL} & = & \mathbf{18.02}\\\end{array}[/tex]
So, 1 mol has a mass of 18.02 g.
Next you calculate the mass of 3.2 mol of H₂O
[tex]\begin{array}{rcl}m & = & \text{3.2 mol H$_{2}$O} \times \dfrac{\text{18.02 g H$_{2}$O}}{\text{1 mol H$_{2}$O}}\\ & = &\boxed{\textbf{57.7 g H$_{2}$O}} \\\end{array}[/tex]
The mass of 3.2 moles of H₂O is calculated by multiplying the number of moles by the molar mass of water, which is 18.015 g/mol, giving a total mass of 57.648 grams.
Explanation:The mass of 3.2 moles of H₂O can be calculated using its molar mass. The molar mass of water (H₂O) is 18.015 g/mol, calculated by summing the molar masses of each atom in the molecule: (1.0079 + 1.0079 + 15.999).
To find the mass, simply multiply the number of moles by the molar mass:
Mass = Moles × Molar Mass
Mass = 3.2 moles × 18.015 g/mol = 57.648 g
This result gives you the mass of water for the given moles.
Carbon-14 has a radioactive half-life of 5700 years. If an organism has 11.24 g of carbon-14 in its body at the time of its death, how much carbon 14 will remain after 6350 years?
Answer:
= 5.193 g
Explanation:
Half life is the time taken by a radioactive element to decay by half its original amount. Therefore, since half life of carbon-14 is 5700 years, then it would take 5700 years for a sample of carbon-14 to decay by half of its original amount.
Using the formula;
New mass = Original mass × (1/2)^n, where n is the number of half lives.
n = Period taken/Half life = 6350 years/5700 years =1.114
Therefore;
New mass = 11.24 × (1/2)^1.114
= 5.193 g
Hence, a mass of 5.193 g of Carbon-14 would remain after 6350 years.
After one half-life of 5700 years, half of the initial amount carbon-14 in the organism would remain, which is 5.62g. The time period of 6350 years is more than one half-life so we know the amount of carbon-14 left will be less than 5.62g.
Explanation:The question requires us to calculate how much carbon-14 will remain in an organism after 6350 years, given that it had 11.24g at the time of its death and the half-life of carbon-14 is 5700 years. This is a question of radioactive decay and can be solved using the concept of half-lives. Knowing the half-life of a radioactive isotope means knowing how long it typically takes for half of that isotope to decay.
After one half-life (5700 years), half of the initial carbon-14 in the organism would remain, so after that time, the organism would have 11.24g / 2 = 5.62g of carbon-14 left. The requested time period of 6350 years is more than one half-life but less than two. As radioactive decay is a random process, we can't say exactly how much will remain at this time, but we know it will be less than 5.62g and more than half of that again.
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4NO(g) → 2N2(g) + 2O2(g) endothermic or exothermic
I need help with this anyone help me and I will made you barinlest
Search it up pppppp pp pp
The reaction 4NO(g) → 2N2(g) + 2O2(g) is exothermic because the reverse process consumes energy.
Explanation:The chemical reaction 4NO(g) → 2N2(g) + 2O2(g) is being asked if it is endothermic or exothermic. Based on the information provided, we can infer that the reverse process, forming 2NO(g) from N2(g) and O2(g), requires the input of 181 kJ of energy. Therefore, the reaction where 4NO(g) decomposes into 2N2(g) and 2O2(g) would release that energy, indicating that the reaction is exothermic.
This is supported by similar reactions listed, such as N2(g) + O2(g) + 45 kcal → 2NO(g) and N2O2(g) → 2 NO2(g), which are both endothermic requiring heat; hence their reverse reactions would be exothermic as they release heat
what is the volume of 12.0 grams of oxygen gas at STP
Atomic mass:O = 15.99 grams/moles
Answer:
16.82 L.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm (P = 1.0 atm, STP conditions).
V is the volume of the gas in L (V = ??? L).
n is the no. of moles of the gas in mol (n = mass/molar mass = (12.0 g)/(15.99 g/mol) = 0.7505 mol).
R is the general gas constant (R = 0.0821 L.atm/mol.K),
T is the temperature of the gas in K (T = 0.0°C + 273 = 273.0 K, STP conditions).
∴ V = nRT/P = (0.7505 mol)(0.0821 L.atm/mol.K)(273.0 K)/(1.0 atm) = 16.82 L.
Why does every chemical reaction require a certain amount of activation energy?
A. Energy is released when the reactants begin to react.
B. Energy lost to the environment during the reaction must be replaced.
C. Forming the activated complex requires energy,
D.The products have more potential energy than the activated complex.
E. The reactants have less potential energy than the products,
E is the correct answer because both endothermic and exothermic reactions require activation energy. the reactants have less potential energy than do the products. Energy must be input in order to raise the particles up to the higher energy level.
Answer:
C. Forming the activated complex requires energy,
Explanation:
For any reaction (whether exothermic or endothermic) the reactant molecules need some minimum amount of energy known as Threshold energy.
Reactant molecules have some internal energy and they require some extra amount of energy to reach the threshold energy which is known as activation energy.
This activation energy is required to from an activated complex.
The activated complex is formed where reactant molecules come closer to each other and undergo effective collision. This causes the formation of products.
While skateboarding at 19 km/h, Alana throws a tennis ball at 11 km/h to her friend Oliver. If Alana is the reference frame,
the speed of the tennis ball is
km/h
Answer:
11 km/hr
Explanation:
Taking Alana as the reference frame, we consider the speed with which the ball gets away from her. Therefore the speed given will be with respect to Alana. In this case we disregard the 19 km/hr as it is common to both Alana and the ball.
Answer:
Speed, v = 30 km/h
Explanation:
It is given that,
Speed while skateboarding, v₁ = 19 km/h
Speed with which tennis ball is thrown, v₂ = 11 km/h
We have to find the speed of the tennis ball from the Alana's frame of reference.
v = v₁ +v₂
v = 19 km/h + 11 km/h
v = 30 km/h
Hence, this is the required solution.
How many molecules in 13.5 moles of potassium chloride
13.5 Moles Kcl x 6.022 x 10^23 /1
= 8.12 x 10^24
whenever you need to find molecules just multiply moles by avogadro number
The amount of heat involved in the synthesis of 1 mole of a compound from its elements, with all substances in their standard states at 25°C, is called _____.
A) standard heat of formation
B) heat of solidification
C) enthalpy
D) heat of reaction
Answer:
A
Explanation:
Answer:
A) standard heat of formation
Explanation:
how much ammonium chloride is needed to saturate 100 grams of water at 60 degrees Celsius
Answer:
55.3 g / 100.0 g of water.
Explanation:
From the solubility curve determine the solubility of ammonium chloride in g/100 g of water at 60°C.The theoretical value is 55.3 g.
Since the moon is so small in size in relation to the earth, only a small area of planet earth will see a:
lunar eclipse
corona
solar eclipse
Answer:
Solar eclipse
Explanation:
1. What is the specific heat of a substance that absorbs 2500 joules of heat when a sample of 100
g of the substance increases in temperature from 10 °C to 70°C?
Answer:
0.4167 J/°C.g.
Explanation:
To solve this problem, we can use the relation:Q = m.c.ΔT,
where, Q is the amount of heat absorbed by substance (Q = 2500 J).
m is the mass of the substance (m = 100 g).
c is the specific heat of the substance (c = ??? J/°C.g).
ΔT is the difference between the initial and final temperature (ΔT = final T - initial T = 70°C - 10°C = 60°C).
∵ Q = m.c.ΔT
∴ c = Q/(m.ΔT) = (2500 J)/(100 g)(60°C) = 0.4167 J/°C.g.
The study of the chemical and bond is called chemistry. According to the law of thermodynamics, the heat transfer from the high temperature to the low temperature.
The correct answer to the question is 0.4167.
What is specific heat?The specific heat capacity of a substance is the heat capacity of a sample of the substance divided by the mass of the sample. Specific heat is also sometimes referred to as mass heat capacity.
To solve this problem, we can use the relation:
Q = m.c.ΔT,
where,
Q is the amount of heat absorbed by a substance (Q = 2500 J).M is the mass of the substance (m = 100 g).C is the specific heat of the substance (c = ??? J/°C.g).ΔT is the difference between the initial and final temperature (ΔT = final T - initial T = 70°C - 10°C = 60°C).Q = m.c.T
After the equation, we can get.
c = [tex]\frac{Q}{(m.T)} = \frac{(2500 J)}{(100 g)(60C)}\\ \\ = 0.4167[/tex]
Hence, the correct answer is 0.4167.
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Finding the pH for [H+] = 9.4 * 10-3 M?
Answer:
pH = 2.0
Explanation:
To find the pH of a solution, take the -log[H+]. In this case, the -log(9.4 x 10^-3) equals 2.02687 which makes 2.0 when accounting for significant figures.
A light year is approximately ____.
A) 9.5 trillion kilometers
B) 95 trillion kilometers
C) 150 million kilometers
D) 150 billion kilometers
Answer : A light year is approximately 9.5 trillion kilometers - A)
Answer:
the answer is A) 9.5 trillion kilometers
Explanation:i got you ny g m
Hey sample of helium occupies 235 mL at 788 tour and 25°C. If the sample is condensed into a 0.115 L flask what will be the new pressure assuming constant temperature?
The new pressure of helium gas assuming constant temperature is equal to 1610.26 Torr.
Given the following data:
Initial volume = 235 mLFinal volume = 0.115 LInitial pressure = 788 TorrTemperature = 25°C.Conversion:
Initial volume = 235 mL to L = [tex]\frac{235}{1000} = 0.235\;L[/tex]
To determine the new pressure assuming constant temperature, we would apply Boyle's law:
Mathematically, Boyle's law is given by the formula;
[tex]PV = k\\\\P_1V_1 = P_2V_2[/tex]
Where;
[tex]P_1[/tex] is the original (initial) pressure.[tex]P_2[/tex] is the final pressure.[tex]V_1[/tex] is the original (initial) volume.[tex]V_2[/tex] is the final volume.Substituting the given parameters into the formula, we have;
[tex]788\times 0.235 = P_2 \times 0.115\\\\185.18 = 0.115P_2\\\\P_2 = \frac{185.18}{0.115} \\\\P_2 =1610.26\; Torr[/tex]
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The new pressure assuming constant temperature would be 1610.43 torr.
Given values:
Initial volume (V₁) = 235 mL = 0.235 L ( converted to liters)Initial pressure (P₁) = 788 torrInitial temperature (T₁) = 25°C = 298 K (converted to Kelvin)Final volume (V₂) = 0.115 LTemperature remains constant (T₂ = T₁ = 298 K)Goal: Find the new pressure (P₂) in torr.
Ideal Gas Law:
We can use the ideal gas law, which states: P₁V₁ = P₂V₂Since the temperature remains constant, we can simplify the equation to: P₁V₁ = P₂V₂Rearrange to solve for P₂: P₂ = P₁V₁ / V₂Plug in the values: P₂ = (788 torr) × (0.235 L) / (0.115 L)Calculate P₂: P₂ ≈ 1610.43 torrTherefore, the new pressure assuming constant temperature would be 1610.43 torr.
Given the chemical formula, how is this substance MOST LIKELY classified? A) atom B) compound C) both atom and compound D) neither atom nor compound
Answer:
B) compound
A chemical formula is a compound of different chemicals.
Final answer:
A substance with a chemical formula is typically a compound since it is made up of two or more elements in a fixed ratio. An organic compound, in the case of containing covalently-bonded carbon and hydrogen, differs from an atom which is the simplest indivisible chemical substance.
Explanation:
Given a chemical formula, a substance is most likely classified as a compound. Compounds are substances that result from the combination of two or more elements in a fixed ratio. For example, water (H₂O) is a compound composed of two elements, hydrogen and oxygen, combined in a constant ratio. Here is a step-by-step approach to classifying a substance:
Identify the molecule by the provided chemical formula.
Write the molecular formula.
Determine if the molecule is a covalent, ionic or metallic substance based on the types of bonds present.
In the body, any substance that contains covalently-bonded carbon and hydrogen is classified as an organic compound. The term 'atom' applies to the simplest chemical substances that cannot be broken down chemically into a simpler substance. Therefore, the correct answer to the question is that based on the chemical formula, the substance is most likely a compound.
Isotopes are separated by
A. crystallisation
B. sublimation
C. distillation
D. filtration
In an atomic explosion, enormous energy is released which is due to
A. conversion of chemical energy into heat energy
B. conversion of mechanical energy into nuclear energy
C. conversion of mass into energy
D. conversion of neutrons into protons
Which among the following is a positively charged particle emitted by a radioactive element?
A. Beta ray
B. Alpha ray
C. Cathode ray
D. Gamma ray
Answer:
1. C. distillation
2. B. conversion of mechanical energy into nuclear energy
3. B. Alpha ray
Explanation:
name this compound Ch3ch2ch2cooh
Answer:
Butanoic acid
Explanation:
cooh-carboxyl functuonal group
In 'Ch3ch2ch2cooh' there are 4 carbons.
That means the name of the compound will start with But
There is also a COOH, which means that the compound is a carboxylic acid. So the compound will end in anoic acid.
Add these two together and you get: Butanoic acid
(But + anoic acid = Butanoic acid)
---------------------------------------------
Answer
Butanoic acid
The molecular weight of vitamin C , C6H8O6 is 176.12 grams over mol
What is the mass in grams of 0.000142 mole of vitamin C Express the answer using three significant figures
Answer:
0.0250 g.
Explanation:
∵ no. of moles (n) = mass / molar mass.
∴ mass of Vitamine C = (n)(molar mass) = (0.000142 mol)(176.12 g/mol) = 0.02501 g = 0.0250 g. "three significant figures"
Which is a property of covalent compounds?
Answer:
Explanation:
The properties of covalent bonds are:
1. Low boiling points and melting points.
2. Various colors.
3. Poor conductors of heat and electricity.
4. Brittle solids.
Covalent compounds form through the combination of two non-metals that share electrons. These compounds have low melting and boiling points and do not conduct electricity due to lack of free ions.
Explanation:A property of covalent compounds is that they are typically formed when two non-metals combine, resulting in the sharing of electrons between atoms. This shared electron pair is known as a covalent bond. Another important property is that covalent compounds have low melting and boiling points compared to ionic compounds because they do not have charged ions, so the forces between molecules are weaker. Covalent compounds also don't conduct electricity as there aren't many free ions to carry charge.
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the number of protons and neutrons in an atom is known as the
A.) isotope. B.) atomic number. C.) mass number. D.) energy level.
Answer:
Its B. Just look at google.
Answer:
The number of protons and neutrons in an atom is known as the mass number. C.)
17.
What do you know about a chemical compound by looking at its chemical formula
Answer:
The number and the kinds of atoms in the compound
Explanation:
A chemical formula of a compound contains symbols o the atoms of the elements present in the compound as well as the number of atoms of each element in the form of subscripts.Therefore it helps us to know the elements in a compound and the number of atoms in the compounds.Which of the following is not present in an atom?
Electron
Element
Neutron
Proton
Answer:
Element
Explanation:
since electron,neutron,and proton are inside of an atom, the answer would be elements, since elements are made up of atoms, but not present in the atom itself.
Answer:
b
Explanation:
Science has determined with some certainty where the ______ are within the nucleus of an atom.
A: electrons
B: protons
C: protons and neutrons
D: protons and electrons
Answer:
C. Protons and neutrons. They are located in the nucleus f an atom while the electrons orbit the nucleus.
Plz Help! If 0.0025 mol NaNO3 forms during the reaction, what is the concentration of NaNO3 in the final solution?
Please give a step-by-step solution to this problem.
Answer:
Hi! I hope this will help
you with your question, whether this is an assignment or not. The answer that I
get is 0.033 concentration.
If 0.0025 mol NaNo3 forms
during the reaction, the concentration of NaNO3 in the final solution should be
0.033.
The concentration of NaNO₃ in the final solution, considering the sum of the given volumes, is approximately 0.276 M.
To find the concentration of NaNO₃ in the final solution, we need to know the volume of the solution. However, since it's not provided in the question or the additional information, we'll assume that the final volume of the solution is the sum of the volumes given in the reference information (0.2L from Na+ and 50mL + 40mL for NO₃).
Step 1: Convert mL to Liters for NO₃ since the concentrations are in Molarity (moles/liter). Therefore, the total volume in liters is 0.2L + 0.05L + 0.04L = 0.29L.
Step 2: We know from the information given that 0.08 mol of NaNO3 is produced. Since this is less than the stated 0.0025 mol, we will use 0.08 mol as the correct value.
Step 3: Calculate the concentration in moles/Liter (Molarity) using the formula C = n/V, where 'C' is concentration, 'n' is the number of moles, and 'V' is the volume in liters. This gives us C = 0.08 mol / 0.29 L = approx 0.276 M NaNO₃.
The concentration of NaNO₃ in the final solution is approximately 0.276 M.