HELPPPPPP PLEASE

1. How many elements are in the formula?
2. How many atoms are in the formula?
3. How many compounds are in the formula?
4. How many oxygen atoms are in the formula?
5. What do coefficients tell you about a chemical formula? to show the
relative amounts of each substance present.
6. What do subscripts tell you about a chemical formula? the number of
atoms of the element immediately before the subscript.
7. Draw a picture of the formula.

Answer:

Explanation:

A- nuclear fusion

Answer: a.Oxygen

Explanation:

Answer:

Temperate Deciduous Forest

Explanation:

Answer:

Condensation

Explanation:

the process of evaporation and condensation takes 7.5 times as much energy as melting or freezing.

According to the forces of attraction, condensation process  requires more energy to be released,as in the process state is changing from less orderly state to a more orderly state.

Forces of attraction  is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases  as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

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Answer:

The molecules gain kinetic energy, more farther apart, and become a gas.

Explanation:

Answer:

Explanation:

Continued heating of liquid water causes the molecules to vibrate even faster, steadily raising the temperature,    Freezing  When liquid water freezes, it releases thermal energy and turns into the solid-state, ice.

Answer:

The number of moles and mass of the sample of argon occupying 37.8L at STP​ are 1.6875 moles and 67.41 grams respectively.

Explanation:

The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.

Then you can apply the following rule of three: if by definition of STP 22.4 L are occupied by 1 mole of Ar, 37.8 L of Ar are occupied by how many moles?

[tex]amount of moles=\frac{37.8 L* 1 mole}{22.4 L}[/tex]

amount of moles= 1.6875 moles

The atomic weight of Ar is 39.948 g/mol. So the mass of the sample of argon can be calculated as:

1.6875 moles* 39.948 [tex]\frac{g}{mol}[/tex] = 67.41 grams

The number of moles and mass of the sample of argon occupying 37.8L at STP​ are 1.6875 moles and 67.41 grams respectively.

Answer:

2.059524x10^26 if im not wrong

Explanation:

avogadro's number is 6.022x10^23

Answer:

They are producers

Explanation:

Phytoplankton are producers and this is because they synthesis their own food and produce energy. They photosynthesized and convert carbondioxide and water in the presence of light energy and chlorophyll to carbohydrates and oxygen. They are producers because they produce their own food.

When an electrolyte dissolves in water, the resulting solution conducts an electric current.

Answer:

d) Combustión.

Explanation:

¡Hola!

En este caso, dado que estamos enfocados en el concepto de cambio químico, el cual se caracteriza por exhibir un cambio en la composición e identidad de las sustancias iniciales (reactivos) a otras finales (productos).

Ahora bien, como se nos dice que los productos de este cambio químico son energía, agua y dióxido de carbono, inferimos que el nombre de este proceso es d) Combustión, por ejemplo la combustion del gas natural para calentar nuestras comidas en la cocina.

¡Saludos!

Answer:

theoretical yield is 12.6f

91.3%

Explanation:

11.5 ÷ 12.6 = 91.3

Answer:

B

Explanation:

Just by looking at the amount of carbons on the straight chain which is four and whom prefix is butane we can see that B is the answers

Answer:

Internal

Explanation:

Internal energy is the sum of kinetic and potential energies of all the molecules in a system.

When naming ionic compounds, we follow the general rules:

Identify and name the cation; this is a metal element or polyatomic cation.

Identify and name the anion; this is a nonmetal element. Change the suffix to '-ide,' or use the polyatomic anion name.

*puts on sunglasses* (⌐■_■)

                                          Good luck, son.

The volume of the gas is 1.27 L at a temperature is 47°C and the pressure is 5.0 atm. Therefore, option (B) is correct.

The ideal gas equation is described as the equation of the state of a perfect gas. The ideal gas equation is the product of the pressure and volume of one-mole gas is equal to the multiplication of the absolute temperature and gas constant.

The mathematical equation for a perfect gas is as follows:

PV = nRT

where n is the moles of an ideal gas, P is the pressure of the gas,  V is the volume, and R is the universal gas constant.

Given, the initial volume of the gas, V₁ = 2.0 L

The initial temperature of the gas, T₁ =  27° C = 300.15 K

The initial pressure of the gas, P₁ = 3.0 atm

The final temperature of the gas, T₂ =  47° C = 320.15 K

The initial pressure of the gas, P₂ = 5.0 atm

We know that for an ideal gas:

[tex]\frac{P_1V_1}{T_1} =\frac{P_2V_2}{T_2}[/tex]

[tex]V_2=\frac{P_1V_1T_2}{T_1P_2}[/tex]

[tex]V_2= \frac{3.0\times2.0\times320.15}{5.0\times 300.15}[/tex]

[tex]V_2= 1.27 L[/tex]

Therefore, the volume of the gas in its final state is equal to 1.27 L when the gas is heated to 47ºC and compressed to 5.0 atm.

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Answer:

Explanation:

Plants get energy from sunlight to produce carbohydrates. When a consumer such as herbivore consume plants, he gets energy and when a canivore or omnivore consume the primary consumer, energy is also transfered to them and this is called food chain.

Matter from the environment which include fallen leaves or trees will decompose after a while in the ground when decomposers begin to act on it and it will eventually give them energy. Decomposer help break down organic matter such as leaves,dead animals and get little amount of of energy in the energy flow pyramid

Answer:

where is the answer??

Please do not just take the points without answering the question.

Answer: °32= 0 °C.

Explanation:

Answer:

Explanation:

Please add the temperature readings from all three trials for both thermometers. Will do the calculation with readings.

Answer: A biome is part of the biosphere. Biomes can influence each other. terrestrial biomes

Explanation:

Answer:

2.5M

Explanation:

Molarity is the measure of the molar concentration of a solution. It is calculated using the formula below:

Molarity = n/V

Where;

n = number of moles (mol)

V = volume (L)

According to the information about Calcium chloride (CaCl2) provided in this question;

n = 0.5moles

M = 0.20M

Molarity = 0.5/0.2

Molarity = 2.5M

Answer:D

Explanation:i did the usa test prep

Answer:answer is D

Explanation:

Answer:

See Explanation

Explanation:

The formula of sodium sulphate is Na2SO4. The component atoms in the compound are; sodium, sulphur and oxygen.

The compound is ionic. it is composed of sodium ions and sulphate ions.

The molar mass of sodium sulphate = 142 g/mol

percentage by mass of sodium =  2* 23/142 * 100 = 32.39 %

percentage by mass of sulphur = 32/142 * 100 = 22.5%

percentage by mass of oxygen = 4 * 16/142 * 100 = 45.1 %

I'm pretty sure the answer is A.

Answer:

where is the answer??

Please do not just take the points without awnsering the question.

Answer:

lowering the control rods

Explanation:

Answer:

Nope.

Explanation:

No, I do not believe that NASA invented thunderstorms to cover up the sound of space battles. For example, Benjamin Franklin is noted to have experimented with lightning in the 1700s, well before NASA or NACA existed. Therefore, NASA did not invent the concept of thunderstorms.

if you expect the unexpected is it still unexpected??

Answer:

Chlorine gas is produced

Explanation:

One of the methods of laboratory preparation of chlorine gas is to heat manganese dioxide with concentrated hydrochloric acid. The acid is oxidized by the manganese dioxide to liberate chlorine gas as follows;

MnO2(s) + 4HCl(aq) -------> MnCl2(aq) + 2H2O(l) + Cl2(g)

Hence, When manganese dioxide is heated with concentrated hydrochloric

acid, chlorine gas is liberated.

Answer:

Visible light

Explanation:

As mentioned in the first section of Lesson 2, our eyes are sensitive to a very narrow band of frequencies within the enormous range of frequencies of the electromagnetic spectrum. This narrow band of frequencies is referred to as the visible light spectrum. Visible light - that which is detectable by the human eye - consists of wavelengths ranging from approximately 780 nanometer (7.80 x 10-7 m) down to 390 nanometer (3.90 x 10-7 m). Specific wavelengths within the spectrum correspond to a specific color based upon how humans typically perceive light of that wavelength. The long wavelength end of the spectrum corresponds to light that is perceived by humans to be red and the short wavelength end of the spectrum corresponds to light that is perceived to be violet. Other colors within the spectrum include orange, yellow, green and blue.