Answer:
E = 0.994 J
Explanation:
Given that,
Total no of photons, [tex]n=1.5\times 10^{13}[/tex]
The wavelength of gamma radiation, [tex]\lambda=3\times 10^{-12}\ m[/tex]
We need to find the total energy in given no of photons. The formula for the energy of a photon is given by :
[tex]E=\dfrac{hc}{\lambda}[/tex]
For n photons,
[tex]E=\dfrac{nhc}{\lambda}\\\\E=\dfrac{1.5\times 10^{13}\times 6.63\times 10^{-34}\times 3\times 10^8}{3\times 10^{-12}}\\\\=0.994\ J[/tex]
So, the total energy is 0.994 J.
What does the 2 mean in the formula 5Mg3(PO4)2? There are two elements in magnesium phosphate. There are two molecules of magnesium phosphate. There are two magnesium ions in a molecule of magnesium phosphate. There are two phosphate ions in a molecule of magnesium phosphate.
Answer: In this compound, phosphorous and oxygen act together as one charged particle, which is connected to magnesium, the other charged particle.
Explanation:
Is a gummy worm increased by two inches a qualitative or quantitative
Answer:
quantitative
Explanation:
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Answer: C
Explanation:
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Why is density a property but mass and volume is not a property?
Answer:
Extensive properties, such as mass and volume, depend on the amount of matter being measured. Intensive properties, such as density and color, do not depend on the amount of the substance present. Physical properties can be measured without changing a substance's chemical identity.
Explanation:
Q.2. How does the valency of elements vary in going down a group of the periodic table?
Answer:
The valency does not change going down a group since the bonding behavior is not affected by the core electrons.
Explain why mass was lost in activity b when the reaction was done in the normal setup, but stayed the same when the reaction was done in the gas collection setup. cite evidence from activity b of the chemical changes gizmo to support your answer.
In accordance with the law of conservation of mass, in any reaction, mass cannot be gained or lost; it must instead be constant in a system. Therefore, in a closed system, mass is not lost, but in an open system, mass is lost as it gets released into the air.
Because the reaction was balanced and contained in the gas collecting arrangement, the mass remained constant, but in the conventional configuration it was not, and the gas had to be released. Due to the gas being released into the atmosphere rather than being retained inside the arrangement, mass was lost.
When the reaction was studied in a closed environment where the gas was collected after the reaction, the mass changes were noted down, which helped to prove the point of the law of conservation of mass and energy. In this case, when the reaction setup was performed in a normal way, the mass lost in the surroundings was not considered or being calculated.
One might consider a soda can as an example, where the carbonated beverage has pressurized carbon dioxide gas in it. When the container is opened, the gas bubbles dissipate into the environment, therefore the mass changes are not recorded. The mass altered would stay the same if the soda can was opened in a manner that allowed the gas evolution to be monitored.
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A car travels 300 miles in 5 hours. How long does it take for the car to travel 82 miles?
Answer:
5 hours is 300 minutes so it goes 1 mile per minute. So 82 minutes = 1 hour and 22 minutes.
Explanation:
So if the car goes 1 mile every minute to reach 82 miles you have to
1 x 82 = 82 minutes converted into hourse = 1 hour and 22 minutes :)
What is a molecular geometry
Answer:
Molecular geometry, also known as the molecular structure, is the three-dimensional structure or arrangement of atoms in a molecule. Understanding the molecular structure of a compound can help determine the polarity, reactivity, phase of matter, color, magnetism, as well as the biological activity.
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1. Examples of pure substances are
elements and _____.
O mixtures
O compounds
Answer: Examples of pure substances include iron, aluminum, silver, and gold. Mixtures: Substances that have two or more different particles are mixtures. Examples of mixture include the salt solution which is a 'mixture' of two components, salt, and water.
Explanation:
Scenario: (This is for questions 7-12)
One January day when it was 10 degrees F outside, an Uncle went to Safeway to collect a bouquet of balloons for his nieces birthday. He ordered a mix of latex balloons in various colors. He appreciated the warmth of the store. He watched the balloons get inflated and noticed they were full and taut with Helium. He took the balloons home. When he got to his nieces' house he noticed the balloons were sunk in and wrinkled and floating ½ way down to the floor of his car. He was so disappointed. He placed them in the back room until the party. The house was 74 degrees. The party began an hour later and when he went back into the room to retrieve the deflated balloons, much to his relief, they were full and taut as before. He wondered what could have caused this reversal?
Question:
What is your hypothesis as to why the Uncle saw these changes in the balloons?
_Fe +_02 → _Fe2O3
Answer:4,3,2
Answer:
4Fe+3O2------>2fe2O3
Explanation:
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What is Atomic Radius
Answer:
Atomic Radius can be simply defined as the distance between the last shell of electrons and the nucleus of an atom.
Answer: The atomic radius of a chemical element is a measure of the size of its atoms, usually the mean or typical distance from the center of the nucleus to the boundary of the surrounding shells of electrons. Illustrated Glossary of Organic Chemistry - Atomic radius. Atomic radius: The radius of an atom. This distance between an atom's nucleus and outer electron shell. ... Atomic radius differs with the bonding state of an atom (for example a nonbonded atom of an element versus the same element within a covalent bond). Atomic radius is determined as the distance between the nuclei of two identical atoms bonded together. The atomic radius of atoms generally decreases from left to right across a period. The atomic radius of atoms generally increases from top to bottom within a group.
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Density can be described as:
a. how heavy a material is.
b. the amount of matter in a given volume of that
material.
c. the same thing as weight
Answer:
B..........................
Identify each of the reactions as synthesis (S), decomposition (D), combustion (C), single replacement (SR) or double replacement (DR).
Identifying each reaction with their correct term
Reaction A Synthesis ( S )Reaction B Double replacement ( DR )Reaction C Decomposition ( D )Reaction D Single replacement ( SR )Reaction E Double replacement ( DR )Reaction F Single replacement ( SR )Reaction G Synthesis ( S )Reaction H DecompositionReaction I Synthesis ( S )Reaction J Single replacement ( SR)What is double replacement reactionA double replacement reaction is a type of chemical reaction whereby two reactants exchanges its ions ( cations or anions ) to produce two new products. It can also known as a double displacement reaction. while a single replacement reaction leads to the substitution of one element for another in chemical compound.
Hence we can conclude that the answers to your questions are as listed above.
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You and your lab group have been asked to design an investigation to determine the effects of heat transfer between two different objects.
Which of the following investigation designs explains the heat transfer when atoms directly touch?
А
Boiling water, in a pan, sitting on a lit Bunsen burner.
B
Boiling water, in a pan, in front of a lit Bunsen burner.
С
Hands warming in front of a lit Bunsen burner.
D
Hands touching the handle of pan sitting on a lit Bunsen burner.
The investigation designs that explain the heat transfer when atoms directly touch have been the hand touching the handle of the pan sitting on the lit bunsen burner. Thus, option D is correct.
Heat has been the energy that can neither be created nor destroyed. The heat energy can be transferred from one body to another with the transfer of atomic energy.
The atoms of an object gaining energy start to vibrate and transfer the energy to another atom that is in close proximity to the vibrating atoms.
The boiling of water in a pan by sitting it onto the bunsen burner has been an example of the transfer of heat energy. The heat energy of the burner has been transferred to the atoms of the pan that resulting in the boiling of the water in the pan. It has been the transfer of energy in an object.
By touching the pan, the energy of the pan has been transferred to the body. Thus the transfer of energy takes place between two different objects.
Thus, the example of heat transfer between two different objects has been the transfer of energy from the bunsen burner to the pan, and from touching the pan by hands, the energy has been transferred to the hands, Thus, option D is correct.
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The number of grams in 2.56 x 1025 molecules of HCl are
Answer:
1569.5g
Explanation:
Given parameters:
Number of molecules = 2.56 x 10²⁵
Unknown:
Mass of HCl = ?
Solution:
To solve this problem, let us find the number of moles first;
Number of moles = [tex]\frac{number of particles}{2.56 x 10^{25} }[/tex]
So,
Number of moles = [tex]\frac{2.56 x 10^{25} }{6.02 x 10^{23} }[/tex] = 0.43 x 10² = 43mol
Now;
Mass of HCl = number of moles x molar mass
Molar mass of HCl = 1 + 35.5 = 36.5g/mol
Mass of HCl = 43 x 36.5 = 1569.5g
calculate the number of oxygen atoms in a 90.0g sample of vanadium(v) oxide v2o5. be sure your answer has a unit symbol if necessary, and round it to 3 significant digits
90.0 g of vanadium (V) oxygen sample has 1.50 x 10 24 oxygen atoms.
To determine the number of oxygen atoms in a vanadium oxide sample, the following steps must be made.
Step 1: Convert the mass of vanadium(V) oxide to mol of vanadium(V) oxide
mol vanadium(V) oxide = mass / molar mass
mol vanadium (V) oxide = 90.0 g / 181.88 g/mol
mol vanadium (V) oxide = 0.49483 mol
Step 2: Convert mol of vanadium (V) oxide to moles of oxygen using mole ratio
mol oxygen = mol vanadium (V) oxide * mole ratio O / mol V2O5
mol oxygen = 0.49483 mol * 5 mol O / mol V2O5
mol oxygen = 2.47416 mol O
Step 3: Convert to oxygen atoms using Avogadro's number
atoms oxygen = mol oxygen * 6.02214 x 10 23 atoms O /mol O
atoms oxygen = 2.47416 mol O * 6.02214 x 10 23 atoms O/mol O
atoms oxygen = 1.48997 x 10 24 atoms or 1.50 x 10 24 atoms O
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Write a ""lifeline"" of a robin over the first year of its life. Include important events.
Explanation:
Robins are born in the spring or summer and are mature birds and ready to breed in the following spring or summer. They do not mate for life. Pairs usually remain together during an entire breeding season, which can involve two or three nestings.
Since leaving the nest (fledging), it takes another 10-15 days for babies to become good fliers and individual birds. The parents continue to feed their young throughout this time.
there are two different compounds of sulfur and fluorine. in sf6 , the mass of fluorine per gram of sulfur is 3.55 g f/g s . in the other compound, sfx , the mass of fluorine per gram of sulfur is 1.18 g f/g s .
The value of x is 2 and the formula of compound SFₓ is SF₂.
The Law Of Multiple Proportions was given by Dalton in 1803.
According to this law, when two elements can combine to form more than one compound, the masses of one element that combine with a fixed mass of the other element, are in the ratio of small whole numbers.
This law is illustrated by the following example:
Hydrogen combines with oxygen to form two compounds, water, and hydrogen peroxide.
Hydrogen + Oxygen ⇒ Water
2g 16g 18g
Hydrogen + Oxygen ⇒ Hydrogen Peroxide
2g 32g 34g
Here, the masses of oxygen (i.e., 16 g and 32 g), which combine with a fixed mass of hydrogen, bear a simple ratio, i.e., 16:32 or 1: 2.
Similarly, the ratio of the mass of fluorine per gram of sulfur in the two compounds is 1.18/3.55 ≈ 1/3
As the ratio of fluorine in the two compounds is 1:3, then according to the law of multiple proportions, the number of fluorine atoms in SFₓ should be 1/3rd of the number of fluorine atoms present in SF₆ which is 6/3=2.
Thus, the formula of compound SFₓ is SF₂.
Therefore, the value of x is 2 and the formula of compound SFₓ is SF₂.
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GUYS PLEASE HELP MEEEE!!! On a hike up a mountain Delilah sees small pieces of rock along the trail, the small pieces look like the rock that the mountain is made from. how did these small pieces of rock break off from the mountain?
1. Wind and rain interacted with the rock breaking it into small pieces
2. The small pieces of rock were formed by earthquakes, tsunamis, and other natural disasters. These disasters were strong enough to break the rock into small pieces
3. Rays from the sun shone down on the rock, and it broke into pieces
4. if anything were left out for a long time, it would break into small pieces
Answer:
2?
Explanation:
Well the rocks can be thrown around or just start breaking down. Sorry if I'm not correct
Answer:
A
Explanation:
Wind and rain interacted with the rock, breaking it into small pieces.
I need help fast!!! Fill in the coefficients
Answer:
2HCl - H2 + Cl2
Explanation:
The two hydrochloric acid molecules decompose into one hydrogen molecule (H2) and one chlorine molecule (Cl2). If there is only one type of a specific molecule present, you should not have to add a coefficient of 1 behind it.
Which is a pure substance? air nitrogen apple juice tap water
Answer:
A Pure substance cant be broken down in any way. Nitrogen cant be broken down any further
Explanation:
Air is a mixture of gasses
Juice and be reduced to sugars
Tap water can be boiled into vapor
Answer: Air nitrogen. Elements and compounds are the two types of pure substances. Examples of common elements include carbon, nitrogen and hydrogen. They consist of one type of atom and cannot break down into something else. ... Compounds such as water, salt and sugar are also pure substances.
Explanation:
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A sample of a gas occupies 1600 milliliters at 20.0°C and 600 torr. What volume will it occupy at the same temperature and 800 torr? (Use Boyle’s equation)
Select one:
a. 2.02 ×10^3 ml
b. 1.00 ×10^3 mL
c. 1.45 ×10^3 mL
d. 1.20 ×10^3 mL
Answer:
d. 1.20 ×10^3 mL
Explanation:
That is the answer have a wonderful day!!
Answer:
im ocean nice to meet u mariam
Explanation:
SCIENCE Match Term Definition Chromosphere A) The central and hottest section of the sun Convective zone B) Layer of the sun where energy is transferred by convection Core C) Layer of the sun that is known for its red color and can only be seen during eclipses Radiative zon D) Layer of the sun where energy is transferred by thermal conduction
The correct match of each term with its definition is as follows:
Core: The central and hottest section of the sunConvection zone: The layer of the sun where energy is transferred by convectionChromosphere: The layer of the sun that is known for its red color and can only be seen during eclipses Radiative zone: The layer of the sun where energy is transferred by thermal conductionWhat are the parts of the sun?The sun is a star that the Earth revolves around and from which it receives light and warmth. The parts in the sun are as follows:
The core is the center and the hottest region where the nuclear fusion reactions that power the Sun occur.The convection zone is the layer of the sun which energy travels by convection from the radiative zone to the photosphereThe radiative zone is the layer of the sun which energy is transferred away from the core by radiation.Chromosphere is the reddish extension of the sun's atmospheric envelope between the corona and the photosphere.Learn more about sun at: https://brainly.com/question/17376727
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Answer:
Chromosphere = C) Layer of the sun that is known for its red color and can only be seen during eclipses.
Convective zone = B) Layer of the sun where energy is transferred by convection.
Core = A) The central and hottest section of the sun.
Radiative zon = D) Layer of the sun where energy is transferred by thermal conduction.
Explanation:
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How many moles of O2 are required
if 12 moles of CuFeS are consumed?
Answer:
24 moles of oxygen are required.
Explanation:
Given data:
Number of moles of CuFeS = 12 mol
Number of moles of O₂ react = ?
Solution:
Chemical equation:
2CuFeS + 4O₂ → Cu₂S + 3SO₂ + 2FeO
now we will compare the moles of O₂ and CuFeS.
CuFeS : O₂
2 : 4
12 : 4/2×12 = 24 mol
How many moles are there in 3.04 X 10^23 molecules of hydrogen, H2, gas?
Answer:
1 mole=6.023×10^23 molecules
3.04×10^23 molecules× value of 1 mole
Explanation:
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According to the concept of Avogadro's number, there are 0.504 moles in 3.04×10²³ molecules of hydrogen.
What is Avogadro's number?Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.
It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .
According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.
Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number.As 1 mole has 6.023×10²³ molecules , thus, 3.04×10²³ molecules of hydrogen will have 3.04×10²³ /6.023×10²³=0.504 moles.
Thus, there are 0.504 moles in 3.04×10²³ molecules of hydrogen.
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(20 POINTS) I NEED IT TODAY!
Base your answer on the information below and on your knowledge of chemistry.
Two very stable compounds, Freon-12 and Freon-14, are used as liquid refrigerants. A Freon-12 molecule consists of one carbon atom, two chlorine atoms, and two fluorine atoms. A Freon-14 molecule consists of one carbon atom and four fluorine atoms.
To which class of organic compounds do Freon-12 and Freon-14 belong?
What gas is this?
Formula: CO
Molar mass: 28.01 g/mol
Boiling point: -312.7°F (-191.5°C)
Density: 1.14 kg/m³
Answer:
Carbon Monoxide
Explanation:
Everything you listen matches everything of Carbon Monoxide
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If you add a light bulb to the circuit, the filament in the bulb will resist the flow of electrons and convert energy into_____ and ______.
Question 2 options:
light and heat
energy and matter
electrons and neutrons
electrons and protons
Answer:
Light and heat
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Answer:
Light and Heat
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Explanation:
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How much volume in liters would 223.5 grams c6h6 has occupy?
Answer:
166.4
Explanation:
This is due to the act 1 mol of gas takes up 22.4 liters of space. so 223.5/30.5
(30.5 is molecular weight of the gas) =7.4mols x 22.4 L = 166.4