Answer:
emitted i think
Explanation:
To determine the type of radiation (alpha, beta or gamma), first determine the background count rate, then the source count rate with no absorber. Next, place a sheet of paper between the source and the monitor. If the counts are significantly reduced, the source emits alpha particles.
Answer:
Plasma Levels of IL-8 and TGF-β1 Predict Radiation-Induced Lung Toxicity in Non-Small Cell Lung Cancer: A Validation Study
Explanation: got it from sources
Select the molecular shape of each molecule based on the formula or Lewis structure.
Answer:
1. linear (A)
2. trigonal-planar (C)
3. tetrahedral (B)
4. linear (A)
Explanation:
Just did it on Edge 2020
The shape of a molecule can be predicted from the number of electron pairs that surround the central atom in the molecule.
The Valence Shell Electron Pair repulsion theory gives us a basis for predicting the shape of molecules. The shape of a molecule can be predicted from the number of electron pairs that surround the central atom in the molecule.
In the image shown, We can see that in HCN , carbon is the central atom and is surrounded by two atoms and no lone pairs. Since there are two electron domains around the central atom, the molecule is linear.
In the second structure, BH3 has boron as its central atom. Three electron domains surround the central atom hence the molecule is trigonal planar.
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Which of the following statements best describes how the compound sodium chloride is formed?
Select one:
a. Sodium transfers one electron to chlorine, forming a sodium ion with a positive one charge and a chloride ion with a negative one charge.
b. Sodium takes one electron from chlorine, forming a sodium ion with a negative one charge and a chloride ion with a positive one charge.
c. Sodium and chlorine share protons.
d. Sodium shares one electron with chlorine.
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Actually Welcome to the Concept of the Ionic Compounds
since the compound NaCl is a ionic compound, both should have ionic charges, hence they are shown as
Na+ Cl-
The correct option is a.)
a.) Sodium transfers one electron to chlorine, forming a sodium ion with a positive one charge and a chloride ion with a negative one charge.
The correct answer is sodium transfers one electron to chlorine, forming a sodium ion with a positive one charge and a chloride ion with a negative one charge.
How sodium chloride is formed?Sodium chloride is a chemical made up of sodium and chloride ionic bonds. When sodium atoms interact with chlorine atoms, sodium chloride is generated. Chlorine will get an electron (a negatively charged particle) from sodium. As a result, sodium becomes slightly positive and chlorine becomes slightly negative. Sodium is reduced in this process because it provides an electron, while chlorine gains an electron and is oxidized.Learn more about ionic compounds here:
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Sunlight shining through a clear window it’s Jeremy’s face while he does his homework he uses a large wooden wooden block to cover the window what do the wooden block in the clear window demonstrate
The image represents a(n)
A) ion of xenon.
B) atom of xenon.
C) molecule of xenon.
D) compound containing xenon.
Answer:
B) atom of Xenon
Explanation:
Xenon is already stable alone, because it has a complete octet, or 8 electrons. This graph is not an ion because it shows xenon is its default state, consisting of 8 electrons.
It is not a molecule because a molecule is a group of atoms, or a compound, what is shown is a singular atom.
Which of the following molecules has a trigonal planar shape?
Answer:
BF 3
Explanation:
The geometry of the BF 3 molecule is called trigonal planar The fluorine atoms are positioned at the vertices of an equilateral triangle. The F-B-F angle is 120° and all four atoms lie in the same plane.
Answer:
BF3
Explanation:
A p ex
All surfaces have texture, which means it affects how things move over it. When it takes a long time for friction to slow down an object, what is most likely true about the surface the object is moving on? The surface is dry. The surface is rough. The surface is uneven. The surface is smooth.
The question is incomplete, the complete question is;
All surfaces have texture, which means it affects how things move over it. When it takes a long time for friction to slow down and object, what is MOST LIKELY true about the surface the object is moving on? (A) The surface is dry (B) The surface is rough (C) The surface is uneven (D) The surface is smooth
Answer:
(D) The surface is smooth
Explanation:
Friction exists because of relative motion between two surfaces in contact with each other. However the magnitude of friction depends on how rough or smooth the surface is.
For smooth surfaces, there is little or no resistance to motion as objects move over the surface. Hence objects take a longer time to slow down on a smooth surface due to very little friction.
On a rough surface, objects tend to slow down relatively quickly. Hence, less resistance to motion on a smooth surface makes an object to take a longer time to slow down on a smooth surface than on a rough surface.
Answer: D
Explanation: Because if the surface is smooth it causes it to be more even for it to be able to cause Friction
if you find this helpful, Your welcome, if not, sorry.
The relationship between a carnivore and an herbivore can be started as
Answer:
Herbivores
Explanation Herbivores are the animals that rely on plants for their nutrition or food. Carnivore are the animals that prey upon herbivore to survive.
Which three types of electromagnetic waves have longer wavelengths than the waves that make up visible light ?
O radio waves, gamma rays, X-rays
O gamma rays, infrared light, X-rays
microwaves, radio waves, infrared light
O infrared light, ultraviolet light, microwaves
Answer:
C
microwaves, radio waves, infrared light
Explanation:
Three types of electromagnetic waves that have longer wavelengths than the waves that make up visible light are microwaves, radio waves, and infrared light.
Electromagnetic waves
Electromagnetic waves are type of waves that do not require material medium for their propagation.
The frequency of the wave decrease with increase in the wavelength of the wave.
Also, the wavelength of the wave decreases with increase in the frequency of the wave.
Examples of electromagnetic spectrum arranged in increasing wavelength
Gamma rayX rayUltra violet rayVisible lightinfraredmicrowaveRadio wavesThus, three types of electromagnetic waves that have longer wavelengths than the waves that make up visible light are microwaves, radio waves, and infrared light.
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Observe the nature changing around your home. You can observe plants, animals, and parts of your actual home as you begin to notice changes in matter. Collect data for two examples of changes in matter. Use the Changes in Matter observation questions to determine if your examples are physical or chemical changes.
Your answer should include two examples, the types of changes observed, and evidence of how the examples were formed. You can use this format:
Example 1:
Type of Change:
Evidence:
Answer:
Example 1. One change I observed was when cooking, I needed to boil water. The water was later evaporated due to the increase of heat from the stove below the pot. Heat traveled and transferred from the stove to the pot then the water. This change is from liquid to gas.
Example 2. I was mixing sugar into my tea, the sugar dissolved into the tea. This is an example of dissolving a solid into a liquid. The tea took the properties of the sugar and turned the drink sweet.
Extra, taking a hot shower and steam leaves the shower. This change is of evaporation.
Explanation:
Hope this helps, even though it was late! <3 :)
Diffusion of Ammonia in an Aqueous Solution. An ammonia (A)-water (B) solution at 278 K and 4.0 mm thick is in contact at one surface with an organic liquid at this interface. The concentration of ammonia in the organic phase is held constant and is such that the equilibrium concentration of ammonia in the water at this surface is 2.0 wt 'Yo ammonia (density of aqueous solution is 991.7 kg/m3) and the concentration of ammonia in water at the other end of the film 4.0 mm away is 10 wt % (density of 961.7 kg/m3). Water and the organic are insoluble in each other. The diffusion coefficient ofNH3 in water is 1.24 x 10- 9 m 2/sCalculate the flux N_B. Explain.
Answer:
The Flux N_B = 0
Explanation:
So, we are given the following set of data or parameters which is going to help in solving this particular Question. So, let us take each at a time;
=> "An ammonia (A)-water (B) solution at 278 K and 4.0 mm thick is in contact at one surface with an organic liquid at this interface."
=>" 2.0 wt 'Yo ammonia (density of aqueous solution is 991.7 kg/m3) and the concentration of ammonia in water at the other end of the film 4.0 mm away is 10 wt % (density of 961.7 kg/m3). ''
With the information above, we can determine the N_A(which the question did not specify that we should calculate).
For the value of N_B, it will be equals to zero(0) because the insolubility of water in organic solvent.
Which of the following is a clue that something is pseudoscience?
A
the presence of empirical evidence
B
the use of a famous athlete for support
C
the support of a respected scientist
D
the use of the scientific method
Pseudoscience has been the belief that are proportions that look scientific but are not. The use of the celebrated athlete for sponsorship is an example of pseudoscience. Thus, option B is correct.
What is pseudoscience?Pseudoscience has been defined as the claim and beliefs that are not testable and looks scientific but actually are not. They are the findings and propositions that can be considered scientific erroneously.
It includes subjective ideas and explanations based on various ideas and beliefs that are not proven scientifically. The use of an athlete for promotional and supporting a claim is an example of pseudoscience as the claim made is not proved scientifically but rather based on some famous person's statement.
Therefore, option B. the famous athlete for support is an example of pseudoscience.
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Write the principle of separation of mixture.
Explanation:
Mixtures can be separated using a variety of techniques. Chromatography involves solvent separation on a solid medium. Distillation takes advantage of differences in boiling points. Evaporation removes a liquid from a solution to leave a solid material.
What information does not need to be included a chemical waste label? Select one: Relative amounts of chemical compounds in the container. The date the waste container was filled completely. A description of the experiment the chemicals were used for. Names of the chemical compounds present in the container.
Answer:
A description of the experiment the chemicals were used for.
Explanation:
A chemical waste label is required to provide information about any hazardous waste present in the container. Some details are mandatory to mention of the chemical waste label to prevent any accident while doing the experiment, that includes:
Chemical compound's name present in the container.Composition and physical state of the waste.Hazardous properties of the waste.The date of manufacturing.Amount of chemical compounds filled in the container.A chemical waste label does not mention or describe the experiment for which the chemicals were used for, scientists, teacher or students should have knowledge of the chemical composition by reading their names and evaluate themselves on which chemical should be used for which experiment.
Hence, the correct answer is "A description of the experiment the chemicals were used for."
The correct answer is A description of the experiment the chemicals were used for.
A chemical waste label must contain all the information about any hazardous waste present in the container. It should clearly indicate the composition of the waste, the date of manufacturing and the amount of chemical compounds filled in the container. A chemical waste label does not need to mention the experiment for which the chemicals were used.
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84. Predict how many electrons each element will most likely
gain or lose.
(a) I
(b) Ba
(c) Cs
(d) Se
Answer:
I will gain 1 electron
Ba will lose 2 electrons
Cs will lose 1 electron
Se will lose 2 electrons
Explanation:
oxidation is a example of ?the answer choices are are here
A.a financial property,B.a chemical property,C.cool science stuff,D.a physical property
Answer:
B. a chemical property
Explanation:
Oxidation requires a chemical reaction to occur, therefore it is a chemical property.
Use the following Information to answer question 10.
DDT is a pesticide that farmers used to spray on their crops to ward off insects.
Unfortunately, once DDT is released into the environment, it does not break
down. Because of this, DDT can spread as shown in the example below,
Crop
Insect
Bird->
Falcon
10. In this example, as the DDT passes along up the food chain, the concentration of
DDT would:
a gradually decrease
b. gradually increase
c. remain the same
d. decrease then increase
Answer:
c. remain the same
Explanation:
Since DDT is persistent and does not break down when release into the environment, it is expected that its concentration as passes along the food chain will likewise persist.
If a substance is non-biodegradable, when it enters the body system or any living tissue, it passes on as waste. Such matter is not broken down or transformed into another type. Over many years, it will remain as it is. We can picture this problem by using non-biodegradable plastics. They remains just the same in the environment.14. How do you describe an atom in which the number of protons is equal
to the number of electrons?
what is the covalent bond for Hydrogen + Chlorine (HCI)
Answer:
HCl, also known as hydrochloric acid, has a covalent bond. The hydrogen (H) atom shares an electron with the chlorine (Cl) to form the bond.
Explanation:
Consequently, the bonding electrons in hydrogen chloride are shared unequally in a polar covalent bond. The molecule is represented by the conventional Lewis structure, even though the shared electron pair is associated to a larger extent with chlorine than with hydrogen.
A gas of 3.4 moles occupies of a volume of 25 Liters. How many moles will occupy 50 Liters?
Answer:
n₂ = 6.8 mol
Explanation:
Given data:
Initial number of moles = 3.4 mol
Initial volume = 25 L
Number of moles = ?
Final volume = 50 L
Solution:
According to Avogadro law,
V₁/n₁ = V₂/n₂
Now we will put the values in formula.
25 L/3.4 mol = 50 L/ n₂
n₂ = 50 L× 3.4 mol/25 L
n₂ = 170 L.mol/25 L
n₂ = 6.8 mol
When a liquid freezes it’s particles get what?
When a liquid is cooled, the average energy of the molecules decreases. At some point, the amount of heat removed is great enough that the attractive forces between molecules draw the molecules close together, and the liquid freezes to a solid.
Its particles no longer have enough energy to overcome the force of attraction between them.hope this help!
Which table best summarizes the subatomic particles and their electrical charge?
H
F proton
negative
positive
no charge
neutron
electron
positive
no charge
negative
proton
neutron
electron
G proton
neutron
electron
positive
negative
no charge
proton
neutron
electron
no charge
positive
negative
Answer:
Proton - Positive charge
Neutron - No charge
Electron - negative charge
Explanation:
An atom is the smallest particle of matter that takes part in a chemical reaction.
It is made up of three fundamental subatomic particles.
Protons are the positively charged particles in an atom. Neutrons do not carry any charges and are neutralElectrons are negatively chargedBoth the protons and neutrons occupy a tiny center where the mass of the atom is concentrated. The region is called the nucleus.
What compound/element is this?
(Easy)
Answer:
C₃H₆ propene
Explanation:
Find the chemical formula by adding all the carbon and then all the hydrogen together.
of the following which element is the heaviest? helium argon lithium aluminum
Answer:
Lithium
Explanation:
it is the only metal listed.
How many significant figures does this measurement contain? 0.0000508800 Gm
Answer:
There are 6 significant figures
Answer:
6 significant figures
Explanation:
When counting significant figures, start on the left with the first non-zero number. Count all numbers that fall between non-zero numbers. Count all zeros after a 1-9 and after the decimal.
Describe how gasoline, as a fuel, can undergo a chemical change.
Answer with Explanation:
A "chemical change" occurs when the structure of the molecules change. If there's no change in structure, it is called a "physical change." This also means that a chemical reaction has to occur for something to be considered a chemical change.
Gasoline when used as a fuel is being transformed into other forms of energy. It undergoes a process called "combustion."
When used as a fuel for cars, the gasoline is being burned to produce heat energy. This energy is then converted into mechanical energy that allows the car to move. Clearly, the gasoline has undergone a chemical change.
Orbital diagram for an iron atom
A 475 cm3 sample of gas at standard temperature (273 K) and pressure
(1 atm) is allowed to expand until it occupies a volume of 600. cm3. What
temperature would be needed to return the gas to standard pressure (1 atm)?
(n = constant
Answer:
T₂ = 344.8 K
Explanation:
Given data:
Initial volume of gas = 475 cm³
Initial temperature = 273 K
Final volume = 600 cm³
Final temperature = ?
Solution:
The given problem will be solve through the Charles Law.
According to this law, The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure.
Mathematical expression:
V₁/T₁ = V₂/T₂
V₁ = Initial volume
T₁ = Initial temperature
V₂ = Final volume
T₂ = Final temperature
Now we will put the values in formula.
V₁/T₁ = V₂/T₂
T₂ = T₁V₂/V₁
T₂ = 273 K × 600 cm³ / 475 cm³
T₂ = 163800K . cm³ / 475 cm³
T₂ = 344.8 K
Plz help! The best answer will be marked as brainliest!
Make a funny sentence for the beneficial or great uses of magnesium
Here is an example for Mercury, it HAS to for Magnesium
¨I have a long history of use in fluorescent lighting so I can light up any room ¨
I heard Magnesium and Oxygen were going out.
So I was like, "OMg!"
there about 5000 elements, which combine to form the vast number of diffrent substances in the world around us
Answer: false 100
Explanation:
if this is the true or false test here
Matter is anything that takes up space and can be described by physical and chemical properties. Which statement
BEST differentiates chemical properties from physical properties?
A)
Physical properties are properties that can be physically seen or touched,
while chemical properties can only be found when matter is mixed with
specific chemicals.
B)
Physical properties are measured when matter changes its physical state,
while chemical properties can only be measured if matter remains in one
state for an extended time.
C)
Physical properties are difficult to measure because they require special
tools to detect, and chemical properties are easy to measure and require
not special tools to detect.
D)
Physical properties can be measured/observed without changing matter
into something else, while chemical properties describe matter's ability to
react/combine with other matter.
Answer:
D)
Physical properties can be measured/observed without changing matter
into something else, while chemical properties describe matter's ability to
react/combine with other matter.
Explanation:
Physical Change
The changes that occur only due to change in shape or physical properties but their chemical or internal composition remain unchanged.
1 = These changes were reversible.
2= They have same chemical property.
3= These changes can be observed with naked eye.
Example :
Water converting to Ice
Water converting to gas
In this water molecule remain the same only they rearrange themselves that change its state of mater not composition
Chemical change:
The changes, that occur due to change in the composition of a substance and result in a different compound is known as chemical change.
1 = These changes are irreversible
2 = These changes occur due to chemical reactions
3 = These may not be observed with naked eye
Example:
Combustion of fuel or wood: that oil or wood convert into energy, CO₂ and ash in case of wood
Boiling of egg: that change the chemical composition of protein in the egg .
The reaction of Hydrogen and oxygen:
H₂ (g) + O₂ (g) → 2H₂O (l)