ASAP, NO TROLLS 20 points!!!!

Answer:

A Front

Explanation:

A Front is a boundary between two air masses of different density, moisture, or temperature

Answer:

PET works by using a scanning device (a machine with a large hole at its center) to detect photons (subatomic particles) emitted by a radionuclide in the organ or tissue being examined.

Newer technology combines PET and CT into one scanner, known as PET/CT. PET/CT shows particular promise in the diagnosis and treatment of lung cancer, evaluating epilepsy, Alzheimer's disease and coronary artery disease.

Explanation: Most Brainliest Please

Answer:

Advantakes= it is a renewable source, you can but it anywhere with sunlight

disatvantage= it cost a lot to place/replace, it uses a lot of different materials

Answer: A = -c + r

Explanation:

Answer:

a = r-c. its that simple I guess

Answer:

Strontium chloride: Makes a red flame.

Strontium sulfate: Makes a green flame.

Copper salts (such as copper sulfate or copper chloride) and barium salts (such as barium chloride or barium nitrate) can produce a red and green flame when burned.

The colors of flames are often determined by the presence of specific chemicals or elements that emit characteristic wavelengths of light when heated. In the case of red and green flames, copper and barium salts are commonly used.

Copper salts, particularly copper sulfate or copper chloride, can produce a green flame when burned. This is due to the emission of specific wavelengths of green light by excited copper ions in the flame.

Barium salts, such as barium chloride or barium nitrate, can produce a red flame when burned. The red color is caused by the emission of specific wavelengths of red light by excited barium ions in the flame.

When these two chemicals are combined in a yule log or firework formulation, they can create a visually appealing display of red and green flames. The copper and barium ions are heated and excited by the flame, releasing their characteristic colors of light. It is important to note that the production of colored flames should be done with caution and adherence to safety guidelines to ensure proper handling and disposal of chemicals.

To learn more about chemicals, here

https://brainly.com/question/29240183

#SPJ2

Answer: 2

Explanation:

To calculate the moles :

[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]

[tex]\text{Moles of} Fe_3O_4=\frac{275g}{233.5g/mol}=1.18moles[/tex]

[tex]3Fe(s)+4H_2O(g)\rightarrow Fe_3O_4(s)+4H_2(g)[/tex]  

According to stoichiometry :

1 mole of [tex]Fe_3O_4[/tex] are produced by = 4 moles of [tex]H_2O[/tex]

Thus 1.18 moles of [tex]Fe_3O_4[/tex] will be produced by=[tex]\frac{4}{1}\times 1.18=4.72moles[/tex]  of [tex]H_2O[/tex]

Mass of [tex]H_2O=moles\times {\text {Molar mass}}=4.72moles\times 18g/mol=85.0g[/tex]

Thus 85.0  g of [tex]H_2O[/tex] will be required and 2 steps are required to get the answer.

answer

Gives brown colour gas

Answer:

A metallic bonding holds the particles of the substance together

Explanation:

The unknown substance is a metal:

Answer:

nine electrons

Explanation:

Answer:

There are 9 total electrons. There is always the same number of protons and neutrons so the charge in the atom balances out. The atomic number is the number of protons, and electrons.

Explanation:

Answer:

Please add as brainlist

Explanation:

Distillation is the process of separating the components or substances from a liquid mixture by using selective boiling and condensation. Distillation may result in essentially complete separation (nearly pure components), or it may be a partial separation that increases the concentration of selected components in the mixture. In either case, the process exploits differences in the relative volatility of the mixture's components. In industrial applications, distillation is a unit operation of practically universal importance, but it is a physical separation process, not a chemical reaction.

Answer:

Option B

Explanation:

Option (B) Particle size

Credit: https://climate.nasa.gov/causes/

The industrial activities that our modern civilization depends upon have raised atmospheric carbon dioxide levels from 280 parts per million to about 417 parts per million in the last 151 years. The panel also concluded there's a better than 95 percent probability that human-produced greenhouse gases such as carbon dioxide, methane and nitrous oxide have caused much of the observed increase in Earth's temperatures over the past 50-plus years.

The panel's full Summary for Policymakers report is online at https://www.ipcc.ch/site/assets/uploads/2018/02/ipcc_wg3_ar5_summary-for-policymakers.pdf.

Answer:

The charge of an atom is determined by the ratio of protons to electrons

Explanation:

I hope this helps!!

A relationship showing the charge on an atom can be expressed as  ;

The charge an atom posses depends on the particles/components of the atom which are protons and electrons. The protons are positively charged ions that are present in the nucleus of an atom while electrons are negatively charge ions present in the outer shell of an atom.  

To predict the charge on an atom we will determine the difference between the  number of protons and the number of electrons present in an atom.

Hence we can conclude that the relationship can be expressed as Types of particle are protons and electrons , Charge on atom = ( Number of protons - Number of electrons )

Learn more : https://brainly.com/question/5686932

Answer:

True

Explanation:

Forces, equal in magnitude and opposite in direction, and cancel each other out are called Balanced Forces.

Balanced Forces DO NOT cause any change in the velocity of the object, but the Object may correspond to a change in shape or size.

Example :

Blasting a balloon by compressing it tightly with both hands, roughly with an equal force, is a practical example of Balanced Forces. In this case, the balloon before the burst stays at a state of rest and same after the burst. But the burst or the compression, causes a change in the shape of the balloon.

Answer:

If it's what I think you're talking about, it's called marrow.

Explanation:

Hope this helped! :)

Answer:

No.

Explanation:

No, Pedro's observations does not suggest that replanting the garden with red flowers caused a change in the ladybird beetle population because the colour of flower has no effect on the change in the population of ladybird beetle, it must be occur due to the dominant genes present in the population of ladybird beetle. This dominant genes is responsible for the presence of more red colour on the ladybird beetles shells.

Answer:

When a ball is rolled up a hill, it has potential energy that can turned into kinetic energy. The kinetic energy would be the ball rolling down the hill.

Explanation:

Hope this helps!

Answer:

Gamma ray

Hope this helps!!!!!!!!

Answer: answwer is22.4 L

At STP that is standard temperature and pressure 22.4 liters of NO₂ are present in 80 grams.

Standard temperature and pressure are defined as a standard set of conditions required for experimental measurements which are established to allow comparison between different sets of data.

Standards which are commonly used are those International Union of pure and applied chemistry and national institute of standards and technology.These are not universally accepted standards but are the ones which are commonly used.

Standard conditions of pressure and temperature are necessary to define standard reference conditions used to express volumes of liquids and gases.

These values are important to physicists, chemists ,engineers ,pilots and navigators.

Learn more about standard temperature and standard pressure,here:

https://brainly.com/question/29129606

#SPJ6

Answer:

c

Explanation:

Answer:

the answer to your question is c

(I) [tex]N_{2} + 3H_{2} --> 2NH_{3}[/tex]

(II) [tex]P_{4} + 5O_{2} --> 2P_{2} O_{5}[/tex]

(III) [tex]2NaF + Br_{2} -->2NaBr + F_{2}[/tex]

(IV) [tex]2ZnS + 3O_{2} --> 2ZnO + 2SO_2[/tex]

(V) [tex]Pb(NO_3)_2 + 2NaCl --> 2NaNO_3 + PbCl_2[/tex]

Answer:

2.54mole of H₂

Explanation:

The reaction expression is given as:

           2H₂O  →   2H₂  +   O₂

Given;

Number of moles of H₂O  = 2.54moles

Unknown:

Number of moles of H₂ produced  = ?

Solution:

To solve this problem, we use the concept of mole comparison. Now from the reaction expression, we know that;

                  2 mole of H₂O will produce 2 mole of H₂

                 2.54 mole of H₂O will then produce 2.54mole of H₂

Answer:

Astatine is a halogen, Nitrogen is a nonmetal, Krypton is a Nobel gas, Chlorine is a halogen and Sulfur is non metal

Explanation:

i am doing this so the other person can get brainly ████████████████████████████████████████

████████████████████████████████████████

██████▀░░░░░░░░▀████████▀▀░░░░░░░▀██████

████▀░░░░░░░░░░░░▀████▀░░░░░░░░░░░░▀████

██▀░░░░░░░░░░░░░░░░▀▀░░░░░░░░░░░░░░░░▀██

██░░░░░░░░░░░░░░░░░░░▄▄░░░░░░░░░░░░░░░██

██░░░░░░░░░░░░░░░░░░█░█░░░░░░░░░░░░░░░██

██░░░░░░░░░░░░░░░░░▄▀░█░░░░░░░░░░░░░░░██

██░░░░░░░░░░████▄▄▄▀░░▀▀▀▀▄░░░░░░░░░░░██

██▄░░░░░░░░░████░░░░░░░░░░█░░░░░░░░░░▄██

████▄░░░░░░░████░░░░░░░░░░█░░░░░░░░▄████

██████▄░░░░░████▄▄▄░░░░░░░█░░░░░░▄██████

████████▄░░░▀▀▀▀░░░▀▀▀▀▀▀▀░░░░░▄████████

██████████▄░░░░░░░░░░░░░░░░░░▄██████████

████████████▄░░░░░░░░░░░░░░▄████████████

██████████████▄░░░░░░░░░░▄██████████████

████████████████▄░░░░░░▄████████████████

██████████████████▄▄▄▄██████████████████

████████████████████████████████████████

████████████████████████████████████████

Answer: lol the answer is A

Explanation:

i’m just smart like that , thought i should give y’all a clue

Answer:

The ratio of atoms in a compound is fixed.

Explanation:

its a

Answer:

Uh Joe stinky?

Explanation:

Answer:

Aluminum(2)sulfur(3)

Explanation:

Answer:

phosphorus

Explanation:

it reacts by gaining three electrons in its outermost shell to be stable