What color are the stars on the diagram with the highest surface temperatures?

Answer:

It would be a physical change, because the atoms are rerranging to form new molecules!

Explanation:

Answer:

The energy of photon is 33.28×10⁻¹⁴  J

Explanation:

Given data:

Frequency of photon = 5.02×10²⁰ Hz

Energy of photon = ?

Solution:

E = h.f

h = planc'ks constant = 6.63×10⁻³⁴ Js

by putting values,

E =  6.63×10⁻³⁴ Js × 5.02×10²⁰ Hz

        Hz = s⁻¹

E = 33.28×10⁻¹⁴  J

The energy of photon is 33.28×10⁻¹⁴  J.

Answer:

maybe greece

Explanation:

by henry cavendish in 1766

Answer:

(It doesn't need to be m/s, but it's the most common unit. It's basically any unit of length divided by any unit of time)

hope this helps and good luck

Answer/Explanation:

Speed is a force and is solved by using acceleration.

You can use the problem to solve for force:

F= MA or Force equals mass times acceleration.

Answer:

1. A mathematical equation that predicts how a physical phenomenon will behave - Scientific law

2. A predicted experimental outcome based on prior knowledge and experience - Hypothesis

3. The variable that is changed on purpose by the scientist - Independent variable

4. The variables that must be kept constant so as not to bias or influence the results - Control variable

5. Data that is descriptive rather than numerical -Qualitative data

6. Data that is numerical - Quantitative data

7. A well tested explanation for why a physical phenomenon occurs - Scientific theory

Explanation:

In the method of science in understanding and explaining phenomena in the universe, observations are made, explanations are put forward, experimented and tested, before conclusions are made. Explanations of some common terms in the scientific process is given below:

1. A scientific law is a mathematical equation that predicts how a physical phenomenon will behave.

2. A hypothesis is a predicted experimental outcome based on prior knowledge and experience.

3. A independent variable is the variable that is changed on purpose by the scientist.

4. A control variable is the variable that must be kept constant so as not to bias or influence the results.

5. Qualitative data is data that is descriptive rather than numerical.

6. Quantitative data is data that is numerical

7. A scientific theory is a well tested explanation for why a physical phenomenon occurs.

Answer:

See the answer below

Explanation:

The total distance Jimmy traveled would be the sum of the distance covered from his house to the store and then from the store to his friend's house. The total distance covered can be determined if the average speed of Jimmy and the time he took to cover the distance are known.

    Average speed = total distance traveled/total time taken

Hence,

total distance traveled = average speed x total time.

Answer:

The density of the unknown substance is 0.75 g/mL.

Explanation:

We are given the volume and mass of a substance and are asked to find the density.

Density is determined with the formula [tex]d=\frac{m}{v}[/tex], where d is the density, m is the mass of the substance, and v is the volume the substance occupies.

Therefore, the density can be found by dividing the mass and volume.

We are given and can determine that:

Now, let's set up the math required.

[tex]d = \frac{90 \ \text{grams}}{120 \ \text{mL}}\\\\d = \frac{3 \ \text{grams}}{4 \ \text{mL}}\\\\d = \frac{3}{4} \ \text{grams per mL}\\\\d = \frac{3}{4} \ \text{g/mL}\\\\ \bold{d = 0.75 \ \bold{g/mL}}[/tex]

Therefore, the density of the substance is 0.75 g/mL.

Answer:

HCl[tex]O_{4}[/tex](aq) + NaOH → NaCl[tex]O_{4}[/tex](aq) + [tex]H_{2} O[/tex](l)

Explanation:

water is a liquid if you can't see

Answer:

In the human body, potential energy is stored in the bonds between atoms and molecules. Chemical energy is the form of potential energy in which energy is stored in chemical bonds. When those bonds are formed, chemical energy is invested, and when they break, chemical energy is released. Notice that chemical energy, like all energy, is neither created nor destroyed; rather, it is converted from one form to another. When you eat an energy bar before heading out the door for a hike, the honey, nuts, and other foods the bar contains are broken down and rearranged by your body into molecules that your muscle cells convert to kinetic energy.

Explanation:

Answer:

b. Their shells

Explanation:

The electronic shell of atoms represents the energy levels in a particular atom.

To understand the way atoms absorb energy, we must know that the wavelength absorbed is commensurate with the energy of the atom. This available energy allows for specific amount of energy to be absorbed.

Therefore, the electronic shell in an atom determines the absorption wavelength of the atom.

Answer:

D=Wavelength A=Amplitude C=Crest F=At rest point

Explanation:

Forgive me if I am wrong!

Answer:

Kinetic energy and potential energy

Explanation:

kinetic energy is when the energy is active and potential energy is when it is about to be active

Answer:

120g

Explanation:

Based on the reaction, when 1 mole of propane and 5 moles of oxygen react, 3 moles of CO2 and 4 moles of H2O are produced. The ratio of production is 3 moles of CO2 per 4 moles of H2O.

Thus, we need to convert mass of water to moles using its molar mass:

Moles H2O (Molar mass: 18g/mol):

63g H2O * (1mol / 18g) = 3.5 moles H2O

Converting to moles of CO2:

3.5 moles H2O * (3 moles CO2 / 4 moles H2O) = 2.625 moles CO2

Mass CO2 (Molar mass: 44g/mol):

2.625 moles CO2 * (44g / mol) = 115.5g of CO2 are released

moles Cu produced : 0.002

Concentration of copper sulfate (CuSO₄) : 0.319 g/dm³

MW CuSO₄ :

[tex]\tt =63.5+32+4\times 16=159.5~g/mol[/tex]

mol CuSO₄ /dm³ :

[tex]\tt \dfrac{0.319}{159.5}=0.002[/tex]

CuSO₄⇒Cu²⁺ + SO₄²⁻

mol Cu : mol CuSO₄ = 1 : 1 , so mol Cu²⁺=0.002

Answer:

Answer

Change in temperature

It is an example of an endothermic reaction. It is absorbing heat.

Answer:

What type of math are you taking.:)

Answer:

CaO

Explanation:

becoz

Ca O

2 2

you must crossing over the eqn

and get CaO

Explanation:

Sodium sulfate

   Na₂SO₄

 The sulfate ion is SO₄²⁻

Sodium sulfite

    Na₂SO₃

 The sulfite ion is SO₃⁻

Sodium sulfide

   Na₂S

 The sulfide ion is S²⁻

Sodium phosphate

 Na₂PO₄

 Phosphate ion is PO₄²⁻

Sodium phosphite

Na₃PO₃

  The phosphite is PO₃³⁻

Sodium phosphide

 Na₃P

  The phosphide ion is P³⁻

Answer:

Alpha particles, Beta particles, Gamma rays

Alpha Is the least harmful

Beta is second most harmful

Gamma is most dangerous

Explanation:

Answer: Nitrogen

Explanation:

Answer:

Arsenic atoms have 33 electrons and the shell structure is 2.8. The ground state electron configuration of ground state gaseous neutral arsenic is [Ar]. 3d10. 4s2.

Explanation:

Answer:

To answer the question, we correctly fill the attached screenshot as follows;

[tex]100.0 g \ H_2 \times \dfrac{1 \ mol \ H_2}{2 \ g \ H_2} \times \dfrac{2 \ mol \ NH_3}{3 \ mol \ H_2} = 33.\bar 3 \ mol \ NH_3[/tex]

The molar mass of N₂ = 28 g/mol

[tex]100.0 g \ N_2 \times \dfrac{1 \ mol \ N_2}{28 \ g \ N_2} \times \dfrac{2 \ mol \ NH_3}{1 \ mol \ N_2} \approx 7.143 \ mol \ NH_3[/tex]

A. Therefore, the excess reactant is hydrogen gas H₂ because it makes the most amount of ammonia, NH₃ (33.[tex]\bar 3[/tex] moles of NH₃)

B. The limiting reactant in nitrogen, N₂, because it is the reactant that makes the least amount of the ammonia, NH₃ (approximately 7.143 mol NH₃)

C. The theoretical yield of ammonia, is the maximum amount of ammonium that can be produced from the reaction between the 100 g of hydrogen gas, H₂, and 100 g of nitrogen gas, N₂ which is given by the amount of ammonia produced by the limiting reactant which is approximately 7.143 mole of NH₃

Explanation:

Answer:

Explanation:

Did u ever get answer

Answer:

What??? I don't understand.

Explanation:

A) structural formula

On edge

Answer:

A

Explanation:

Answer:

2

Explanation:

Answer:

in details

Explanation:

what are the properties of iconic compounds?

Ionic compounds exist in the form of ionic groupings in certain forms called (crystalline forms), and we find in these shapes an organized crystal arrangement of ions so that every ion with a specific charge is attracted to a group of ions with the opposite charge, meaning that one ion is bound by several ionic bonds. At the same time, this explains the presence of ionic compounds usually in the solid state (high density). This situation also explains the high melting and boiling points of these compounds.

One of the most important characteristics of ionic compounds is their inability to conduct electrical conductivity in the solid state due to the ions binding and their inability to move while they become conductive of electricity when they are melted or dissolved in water (ions are free to move in the melt and in the aqueous solution).

And among its most important characteristics:

1- It dissolves in water and does not dissolve with benzene, for example (salt) because water is a polar solvent that can separate ions from each other.

2- It has a high melting point due to the force of electrostatic attraction between the positive and negative ions.

3- Its state is solid under normal conditions, due to the force of the electrostatic attraction between the positive and negative ions.

4- Solid ionic compounds do not conduct electricity, but their solutions with water conduct electricity, because when the compound is solid, the ions are connected to each other, but when the compound is a solution, the ions are free to move and conduct the electromagnetic current.

what are the properties of covalent compounds?

In covalent compounds (unlike ionic compounds), we can talk about independent molecules, as covalent compounds are composed of independent molecules linked together by different bonds (van derval, hydrogen) of varying strength. So there are covalent compounds in all three cases according to the strength of these bonds. There are covalent compounds in a gaseous state (weak bonds between molecules), covalent compounds in a liquid state, and also there are covalent compounds in a solid state (strong bonds between molecules). The same is true for melting and boiling points, so covalent compounds Their boiling and melting points vary according to the quality and strength of the bonds between the molecules.  

As for the electrical conductivity, in the pure state, the covalent compounds are mostly non-conductive because they are not originally charged or because they are electrically neutral in the presence of charges, but the charged ones may have what is known as the electric torque and will come.

Likewise, in their smelters, the molten solid covalent compound (such as molten sugar) is not conductive of electricity. As for the solution, it may be non-conductive as in the case of a sugar solution or be conductive as is the case in a solution of hydrogen chloride (hydrochloric acid) and the reason for conducting or not in the solution is due to The covalent compound ionization (conversion into separate ions by the action of a solvent) or its de-ionization.

Sugar does not ionize when dissolved in water. Rather, its molecules only separate from each other, while hydrogen chloride does ionize to the hydrogen ion and the chlorine ion.

which type of compound is sugar?

The chemical or molecular formula for sucrose is C 12 H 22 O 11, which means that each sugar molecule contains 12 carbon atoms, 22 hydrogen atoms, and 11 oxygen atoms. A type of sugar called sucrose is also known as sucrose. It is a sucrase made in many different plants.

The properties of the compounds are the following:

a. The properties of the ionic compounds are they are hard, form crystals, have high melting and boiling point, good insulators.

b. The properties of the covalent compound are they are soft, do not form the crystal, have low melting and boiling point, bad insulators.

c. Sugar is a covalent compound.

Covalent compounds are attracted by covalent bonds. They make bonds by sharing one or more pairs of valence electrons.

These compounds are ions or charged particles. They make bonds when an atom or more atoms lose or gain electrons.

Thus, the properties are a. The properties of the ionic compounds are they are hard, form crystals, have high melting and boiling point, good insulators.

b. The properties of the covalent compound are they are soft, do not form the crystal, have low melting and boiling point, bad insulators.

c. Sugar is a covalent compound.

Learn more about covalent compounds

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