Answer:
45.165 × 10²³ molecules
Explanation:
Given data:
Number of moles of SO₂ = 7.50 mol
Number of molecules = ?
Solution:
Avogadro number:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ molecules
7.50 mol × 6.022 × 10²³ molecules
45.165 × 10²³ molecules
give the number of protons and neutrons in the nucleus of the following atoms
when an element has 238 mass number and 92 atomic number give the number of protons and neutrons in the nucleus
The number of protons and neutrons in the nucleus : 92 and 146
Further explanationGiven
Mass number = 238
Atomic number = 92
Required
Protons and neutrons
Solution
Mass number=number of protons + neutrons
Atomic number=number of protons=number of electrons
Atomic number = 92⇒number of protons=92
Number of neutrons = mass number - atomic number
Number of neutrons = 238 - 92 = 146
Chemical reactions and nuclear reactions cause matter to change in different ways. Which two statements describe how matter changes only in a nuclear reaction?
A. Some energy is transformed into mass. B. New elements are formed.
C. The total mass of the reactants is. conserved.
D. The atomic nuclei change.
Chemical reactions and nuclear reactions are the types of reactions. In a nuclear reaction, some energy is transformed into mass, and the atomic nuclei change.
What is a nuclear reaction?A nuclear reaction is a reaction that involves a change in the structure of the nucleus of the atom with a release of energy. The atomic nuclei collide to release energy and result in nuclides.
The atomic nuclei change after the collision and result in the formation of the isotope and isobars. The bombardment of the atomic nuclei releases energy in the form of mass.
Therefore, option A. energy is transformed into mass, and option D. change in atomic nuclei are the changes of the nuclear reaction.
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What are the top industries in the north east?
Answer:
Explanation:
Map of Industries by State in the Northeast
Agriculture.
Oil & Gas, and Mining.
Construction.
Manufacturing.
Wholesalers.
Retail.
Transportation.
Utilities.
1. What type of reaction is this?
H2O + H2 + O2
A. Synthesis
B. Decomposition
C. Combustion
D. Single Replacement
E. Double Replacement
I say synthesis
Answer:
B if you meant [tex]H_{2}O[/tex]->[tex]H_{2} +O_{2}[/tex]
Explanation:
A. Synthesis: reaction where two or more reactants combine to form one product. A+B->AB
B. Decomposition: reaction where a single compound reacts to form more than one product. AB-> A+B
C. Combustion: any reaction in which a substance reacts with oxygen gas. (needs [tex]O_{2}[/tex])
D. Single replacement: a type of reaction where one element replaces a similar element within a compound. Reaction is always an element and a compound.
E. Double replacement: a type of reaction where the ions of two compounds exchange places in an aqueous solution to form two new compounds. AB+CD->AD+CD
There are 25 elements found in living things. How many of these elements are found in some organisms but not all?
O1
O 6
O 19
O 25
how many carbons are present on the reactant side??
Answer:
1
Explanation:
The equation is already balanced, and on the left hand side (reactants side), we see that there's one CH4 molecule and 2 O2 molecules. We don't care about the O2 molecules in this case, so we turn our focus to the CH4 molecule. One CH4 molecule has one carbon atom and 4 H atoms, so we know that there's only one carbon atom on the reactants side.
Answer:
1
Explanation:
One carbon in CH4 is present on reactant side
During ionic bonding, there is a transfer of electrons...
O from one metallic element to a different metallic element
O from one nonmetallic element to a different nonmetallic element
O from one metallic element to a different metalloid
O from one metallic element to a different nonmetallic element
Answer:
from one metallic element to a different nonmetallic element
Explanation:
For example NaCl is ionic compound in which Na metal donate electron to Cl non metal
Which form of energy does a plant store when light is transformed during photosynthesis?
A.chemical energy
B.thermal energy
C.mechanical energy
D.electrical energy
Answer:
A. chemical energy
Explanation:
Count the atoms in this common formula for the explosive TNT
2C7H5(NO2)3
Answer:
Explanation:
7 carbon atoms, 6 hydrogen atoms,9 NO2 atoms
7+6+9=22
2(22)=44
44 atoms
PLEASE HELP THIS IS WORTH 13 POINTS
Answer:
The chemical reaction is a Double Displacement
Explanation:
Balance the reaction of KOH + AlCl3 = KCl + Al(OH)3
Where is our Solar System located?
Answer:
In space ( the sun and it's atmospheres )
Donde están ubicados los componentes básicos de una reacción química
Las sustancias a la izquierda de la flecha en una ecuación química se denominan reactivos. Un reactivo es una sustancia que está presente al comienzo de una reacción química. Las sustancias a la derecha de la flecha se denominan productos.
A student rubbed a plastic comb with a piece of silk cloth. She held the comb near running water and saw that the stream of
water moved toward the comb.
Why did the stream of water move toward the comb?
A Rubbing the comb caused it to get hot so it repelled the water.
O B. Rubbing the comb caused charges to build up, so it repelled the water.
C. Rubbing the comb caused it to become magnetized, so it attracted the water.
O D. Rubbing the comb caused static electricity to build up, so it attracted the water.
Answer:
c
Explanation:
c
Answer:
Rubbing the comb caused static electricity to build up, so it attracted the water.
Given the reaction: 4NH3 + 502 4NO + 6H2O
What is the total number of moles of NO produced when
1.0 mole of O2 is completely consumed?
Answer:
[tex]\frac{4}{5}[/tex] moles
Explanation:
The reaction equation is given as:
4NH₃ + 5O₂ → 4NO + 6H₂O
The number of moles of O₂ that completely reacted is given as 1 mole
To solve this problem, we are going to use a stoichiometric approach from the balanced reaction equation:
5 moles of O₂ will react completely to produce 4 moles of NO
1 mole of O₂ will therefore react to produce x mole of NO
5x = 4
x = [tex]\frac{4}{5}[/tex] moles of NO
Answer: 0.80 mole
Explanation:
Liquid waste that exits the body is _____________ and solid waste is ___________.
A. Feces, Urine
B. Urine, Feces
C. Lymph, Feces
D. Blood, Lymph
Answer:
The answer is B. Urine, Feces
Explanation:
Answer:
b.urine ,feces
.................
Why are the halogen elements so dangerous in their uncombined forms?
Answer:
Halogen elements are dangerous in their uncombined forms because they are very reactive.
Explanation:
Hope this helps you! ^^
Halogens, including such chlorine or bromine, pose an environmental and occupational risk to the lungs and other organs.
What are halogens?The halogens are a group of five or six chemically related elements in the periodic table: fluorine, chlorine, bromine, iodine (I), and astatine.
Tennessee, an artificially created element, may also be a halogen. This group is known as group 17 in modern IUPAC nomenclature.
Halogens are unique in that they have seven valence electrons, making them extremely reactive. Valence electrons are the electrons involved in chemical reactions and are contained in the outer shell.
Fluorine is one of the most reactive elements known to man. Halides are simple halogen-containing compounds. Fluorine gas is lethal. Even breathing air containing 0.1% fluorine can result in death.
Thus, the halogen elements so dangerous in their uncombined forms.
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An indicator is used to measure the ___
Answer:
Small distances and angles
Explanation:
In various contexts of science, technology, and manufacturing (such as machining, fabricating, and additive manufacturing), an indicator is any of various instruments used to accurately measure small distances and angles, and amplify them to make them more obvious.
3 common uses for salt
Answer:
Salt has long been used for flavoring and for preserving food. It has also been used in tanning, dyeing and bleaching, and the production of pottery, soap, and chlorine. Today, it is widely used in the chemical industry.
Calculate the maximum
mass of magnesium oxide
that can be made from
2.4g of magnesium and
2.4g of oxygen.
1
1
2Mg + 0, → 2Mgo
Answer:
Mass = 3 g
Explanation:
Given data:
Mass of magnesium = 2.4 g
Mass of oxygen = 2.4 g
Mass of magnesium oxide formed = ?
Solution:
Chemical equation;
2Mg + O₂ → 2MgO
Number of moles of oxygen:
Number of moles = mass / molar mass
Number of moles = 2.4 g/ 32 g/mol
Number of moles = 0.075 mol
Number of moles of magnesium:
Number of moles = mass / molar mass
Number of moles = 2.4 g/ 24 g/mol
Number of moles = 0.1 mol
now we will compare the moles of magnesium oxide with both reactant.
Mg : MgO
2 : 2
0.075 : 0.075
O₂ : MgO
1 : 2
0.1 : 2/1×0.1 = 0.2
Mass of magnesium oxide:
Mass = number of moles × molar mass
Mass = 0.075 mol × 40 g/mol
Mass = 3 g
What is the mass number of an element that has 6 protons, 8 neutrons, and 6 electrons?
Answer:
14
Explanation:
the mass number = protons number +neutrons number
so..
6+8=14
A scuba diver begins to surface carrying a tank containing 4.0 L of a
gas at 730 mm Hg. What volume will the gas occupy at 760 mm Hg?
O A. 3.8 L
OB. 4.2 L
O C. 120 mm Hg
O D. 920 mm Hg
Answer:
3.8 L
Explanation:
From Boyle's law;
P1 V1 = P2 V2
P1 = initial pressure = 730 mm Hg
P2 = final pressure = 760 mm Hg
V1= Initial volume = 4.0 L
V2 = final volume = ?
V2 = P1 V1/P2
V2 = 730 × 4/760
V2 = 3.8 L
Iodine consists of simple molecules. Which of the following is a property of simple molecules?
A - Have no overall electric charge
B - They conduct electricity
C - Have high boiling points
D - Have giant structures
Answer:
A - Have no overall electric charge
Explanation:
Ideally, atoms of elements are chemically bonded to form molecules. A molecule is said to be a SIMPLE MOLECULE if it contains only a few atoms linked strongly together by covalent bonding. Examples of simple molecules are O2, CO2, I2, Cl2 etc.
The following properties are possessed by simple molecules:
- They have no overall electric charge
- They have low melting and boiling points due to the weak intermolecular forces that are easily overcomed when temperature is applied.
- Since they have no net charge, they do not conduct electricity.
- As their name implies, they rather have simple structures.
1.
Explain what changes occur in particle motion, temperature,
and state of a pure substance when thermal energy is added
or removed.
Type your answer here
Answer:
Thermal energy is heat energy.
When it is removed, the temperature of particle decreases due to decrease in the internal energy involving that particle.
Motion of the particle decreases due to decrease in kinetic energy caused by reduction in the internal energy.
The state of the particle changes from that current state e.g liquid or gas to a solid state due to increase in the latent heat of vapourisation.
With thermodynamics we can find that by giving energy to a substance the temperature increases and after a certain value it can change from solid to liquid and vapor state
In the opposite case, as the energy of a substance decreases, the temperature decreases and goes from a gaseous state to a liquid and a solid.
Thermodynamics study the changes that substances have as their energy changes, finding macroscopic relationships such as temperature, state, pressure and volume.
The temperature of a substance is a measure of the internal energy of the particles and the thermodynamic state of a substance can be solid, liquid or gaseous depending on whether the shape and volume is maintained.
Let's analyze what happens when we increase the energy of a substance.
In this case, the particles that form has more energy, so the temperature of the substance increases, if the energy is enough to break any bonds, the substance can go from the solid state to the liquid and by continuing to increase the energy it can be break all the bonds going from the liquid to the gaseous state.
In the opposite case, when the energy of the particles decreases, it has smaller movements, therefore its temperature decreases and if some bonds are formed, the substance stops from the gaseous state to the liquid state and if the energy continues to decrease, more bonds are formed passing the liquid state to solid.
In conclusion, with the change in energy, the temperature changes in the same direction and after a certain value it can go from solid to liquid and as the temperature increases more it can go from liquid to gas.
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En un matraz, disponemos de 100 g de gas oxígeno que se encuentran a 1 at de presión y 273 K de temperatura. Calcular : a) el número de moles de gas oxígeno contenidos en el matraz ; b) el número de moléculas de oxígeno ; c) el número de átomos de oxígeno ; d) el volumen ocupado por el oxígeno. Masa atómica del oxígeno = 16.
Answer:
Explanation:
Dado que:
masa de oxígeno gaseoso = 100 g
presión = 1 atm
temperatura = 273 K
(a)
número de moles de oxígeno contenidos en el matraz = masa de oxígeno / masa molar de oxígeno
= 100 g / 16 gmol⁻¹
= 6.25 moles
(b) El número de moléculas de oxígeno es el siguiente:
Dado que 1 mol de oxígeno gaseoso contiene 6.023 * 10²³ moléculas de oxígeno.
Entonces, 6.25 moles contendrán:
= (6.25 × 6.023 * 10²³) moléculas de oxígeno.
≅ 3.764 × 10²³ moléculas de oxígeno.
(c) El número de átomos de oxígeno es:
= 2 × 3.764 × 10²³
= 7.528 × 10²³ átomos de oxígeno
(d) Usando la ecuación de gas ideal
PV = nRT
El volumen ocupado por el oxígeno = [tex]\dfrac{nRT}{P}[/tex]
Volumen ocupado por oxígeno = [tex]\dfrac{ 6.25 * 8.314 *273}{1}[/tex]
Volumen ocupado por oxígeno= 14185.76 m³
950 J of energy is used to heat an unknown mass of copper from 20.0° C to 95.0° C. The specific heat of copper = 0.39 J/(g·°C).
What is the mass of the copper?
Answer:
32g
Explanation:
I just took the test and got it right
The mass of the copper is approximately 32.5 grams.
To find the mass of the copper, we can use the formula for heat:
Q = m * c * ΔT
where Q is the heat energy, m is the mass, c is the specific heat, and ΔT is the change in temperature.
In this case, we are given:
Q = 950 J (heat energy)
c = 0.39 J/(g·°C) (specific heat)
ΔT = 95.0°C - 20.0°C
= 75.0°C (change in temperature)
Substituting these values into the formula, we can solve for the mass (m):
950 J = m * 0.39 J/(g·°C) * 75.0°C
Dividing both sides of the equation by (0.39 J/(g·°C) * 75.0°C), we get:
m = 950 J / (0.39 J/(g·°C) * 75.0°C)
m ≈ 32.5 g
Therefore, the mass of the copper is approximately 32.5 grams.
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urgent plzz help meeee thx
Answer:
8
Explanation:
From the question given above, the following data were obtained:
t–butyl ion = (CH₃)₃C⁺
Number of valence electron =?
The valence electron(s) talks about the combining power of an element or compound as the case may be.
Considering the t–butyl ion, (CH₃)₃C⁺ we can see that it has a charge of +1 indicating that it has given out 1 electron to attain the stable octet configuration which has a valence electrons of 8. Thus, the valence electron of t–butyl ion, (CH₃)₃C⁺ is 8
Help for the last two please
Answer: gamma& the firt one
Explanation:
Answer:
Gamma waves travel faster than radio waves; microwaves have a higher frequency and less energy.
Explanation:
Although radio waves have a longer wavelength, gamma waves come in more frequently making them faster.
Microwaves tend to have a state of a non-ionizing material which happens to have a higher frequency but to the point that microwaves produce heat to vibrate strongly, it creates less energy than radio waves.
Can someone help?? This is really hard.
Answer:
See Explanation
Explanation:
Let us consider the first two reactions, the initial concentration of CO was held constant and the concentration of Hbn was doubled.
2.68 * 10^-3/1.34 * 10^-3 = 6.24 * 10^-4/3.12 * 10^-4
2^1 = 2^1
The rate of reaction is first order with respect to Hbn
Let us consider the third and fourth reactions. The concentration of Hbn is held constant and that of CO was tripled.
1.5 * 10^-3/5 * 10^-4 = 1.872 * 10^-3/6.24 * 10^-4
3^1 = 3^1
The reaction is also first order with respect to CO
b) The overall order of reaction is 1 + 1=2
c) The rate equation is;
Rate = k [CO] [Hbn]
d) 3.12 * 10^-4 = k [5 * 10^-4] [1.34 * 10^-3]
k = 3.12 * 10^-4 /[5 * 10^-4] [1.34 * 10^-3]
k = 3.12 * 10^-4/6.7 * 10^-7
k = 4.7 * 10^2 mmol-1 L s-1
e) The reaction occurs in one step because;
1) The rate law agrees with the experimental data.
2) The sum of the order of reaction of each specie in the rate law gives the overall order of reaction.
What is the bio-nuclear basis of a carbonated nuclei?
A. NST
B. NS
C. BS
D. AOTA
Answer:
IM GONNA SAY THE ANSWER IS D. All of the above!
Explanation:
NST - NO SUCH THING
NS - NONSENSE
BS - BULL SHHHHHH
AOTA - ALL OF THE ABOVE
LOL
explain why the properties of a reactant can be different from the properties off the products of the reaction
Answer:
The reactants and products in a chemical reaction contain the same atoms, but they are rearranged during the reaction. As a result, the atoms end up in different combinations in the products. This makes the products new substances that are chemically different from the reactants.
Explanation: