Step 4: Measuring the Volume of Air Near 0°C
°C
Temperature of gas:
Height of the column of gas.
cm DONE
Temperature of gas

Answer:

E = 8.84×10⁻¹⁷ J

Explanation:

Given data:

Wavelength of wave = 2.25 nm (2.25×10⁻⁹ m)

Energy of wave = ?

Solution:

Formula:

E = hc/λ

c = 3×10⁸m/s

h =6.63 ×10⁻³⁴ Js

now we will put the values,

E = 6.63 ×10⁻³⁴ Js ×  3×10⁸m/s / 2.25×10⁻⁹ m

E = 19.89×10⁻²⁶ Jm / 2.25×10⁻⁹ m

E = 8.84×10⁻¹⁷ J

Answer:

(A) A-(S) ; B-(R) ; C-(Q) ; D-(P).

Explanation:

(A)-S_ The male part of a flower.

(B)-R _The stalk of an anther.

(C)-Q_ The female structure of a flower.

(D)-P _The portion of the pistil recieving the pollen.

Answer:

metallic bond

Explanation:

Metallic bonds are the attraction between a positive metal ion and the electrons surrounding them.

This bond is found in metals and their alloys. They are interatomic forces.

Answer:

Winter would be warmer, and summers would be cooler.

Answer:

winter would be cooler and summers would be warmer

Explanation: i am hella late but......

Answer:

Diabetes is a disease that occurs when your blood glucose, also called blood sugar, is too high. Blood glucose is your main source of energy and comes from the food you eat. Insulin, a hormone made by the pancreas, helps glucose from food get into your cells to be used for energy. Sometimes your body doesn’t make enough—or any—insulin or doesn’t use insulin well. Glucose then stays in your blood and doesn’t reach your cells.

Over time, having too much glucose in your blood can cause health problems. Although diabetes has no cure, you can take steps to manage your diabetes and stay healthy.

Answer:

Diabetes is the condition in which the body does not properly process food for use as energy. Most of the food we eat is turned into glucose, or sugar, for our bodies to use for energy. The pancreas, an organ that lies near the stomach, makes a hormone called insulin to help glucose get into the cells of our bodies.

- CDC

Answer:

Cloud condensation nuclei or CCNs are small particles typically 0.2 µm, or 1/100 the size of a cloud droplet on which water vapor condenses. Water requires a non-gaseous surface to make the transition from a vapour to a liquid; this process is called condensation.

Answer:

adding 3 tbsp. of salt should be about enough to make the egg float.

Explanation:

The density of the average egg will be slightly greater than that of water, so it will sink. To make the egg float, we have to make the water more dense by adding salt. For 1 cup of water.

Answer:

Please mark me brainliest. the answer is

Explanation:

The problem is that the desalination of water requires a lot of energy. Salt dissolves very easily in water, forming strong chemical bonds, and those bonds are difficult to break. Energy and the technology to desalinate water are both expensive, and this means that desalinating water can be pretty costly.

Fractional distillation not used to produce drinking water from sea water Because single step distillation process is enough to purify sea water.

The separation of a liquid mixture into fractions differing in boiling point (and hence chemical composition) by means of distillation, typically using a fractionating column.

We don’t need fractional distillation but single step distillation to purify seawater.

Fractional distillation is most commonly used to separate various volatile organics out of crude oil as the fractions of the crude have different uses.

Removing water from a solution is a single step process we can easily do at home.

Hence,Fractional distillation not used to produce drinking water from sea water Because single step distillation process is enough to purify sea water.

Learn more about Distillation here ;

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Answer:

B.

Explanation:

1 orbital is 4 half of 4 is 2.

Answer:

B. Rabbits

For photosynthesis you need chlorophyll but rabbits don't have it.

Answer:

d.) sound energy

That is the correct answer :)

Answer:

The correct answer is - option b. We have discovered that atoms are made up of smaller particles, called subatomic particles.

Explanation:

Dalton made various postulates related to the atom which is an atomic theory that was first try to describe all properties of atoms. The major part of this atomic theory is that the atoms are unit that makes all the matter which is indivisible.

This postulate of the atomic theory is incorrect and changed as atoms are not indivisible and can divide into subatomic particles (proton, neutron and electron) however atoms are the unit that involves in reaction.

The way in which the atomic theory changed since John Dalton wrote his postulates is that: B. We have discovered that atoms are made up of smaller particles, called subatomic particles.

An atom can be defined as the smallest, indivisible, fundamental unit of matter that forms all chemical elements.  Thus, it is the fundamental (basic) building blocks of matter.

The first model of an atom was proposed by a notable English chemist called John Dalton. In the early 1800s, John Dalton adopted Democritus' theory to formulate the first model of an atom.

Dalton's atomic theory postulated that the atom of a chemical element as an impenetrable, indivisible, very small (tiny) but movable hard sphere i.e it cannot be divided into subatomic particles.

However, it has been established by other atomic model that an atom comprises three subatomic particles such as:

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Answer: C.)

Sugar can be grown and produced in a relatively short time period.

Answer:

Travelling hygiene

Drink only bottled water.

Don't use tap water to clean your teeth.

When you wash your hands, make sure they are totally dry before you touch any food.

Don't wash fruit or vegetables in unsafe water.

Answer:

C

The particles in solid are closely packed which prevent it from changing its shape

The phrase that best describes the particles in a solid is closely packed.

SOLIDS:

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Answer:You can view more details on each measurement unit: molecular weight of BaCl2 or grams This compound is also known as Barium Chloride. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles BaCl2, or 208.233 grams.

Explanation:

Answer:

respiration

Explanation:

respiration means break down of food for production of energy

photosynthesis is the process by which plants produce there own food

Answer:

yes

Explanation:

i don't have the periodic table in front of me right now but you will need it. for the first coloumn, look at the elemnt symbol and write it down. for example hydrogen H. the atomic mass will be written on the bottom of the entry. the atomic number is on the top. the number of protons is the atomic number. the neutrons is atomic mass-atomic number and the electrons you have to count the numbers in the upper right corner. depends what element you look at, there might be a couple rows of the electrons which are the shells. hope i helped :)

Answer:

CO2 + 2H2O

Explanation:

left side of the equation is the products side, right side is the reactant side

Answer:

Carbon Dioxide(CO2) and Water (H2O)

Explanation:

Whatever is on the right side of the equation is the products, the left side is the reactants.

Answer:

bacic

Explanation:

it is very soluble in water

Answer: Amount of ethyl butyrate formed = 11.3 g

Explanation: The reaction between butanoic acid (C3H7COOH) and excess ethanol (C2H5OH) is:

Since ethanol is the excess reagent, the formation of the product i.e. ethyl butyrate is influenced by the amount of butanoic acid present

Based on the reaction stoichiometry:

1 mole of butanoic acid produces 1 mole of ethyl butyrate

Mass of butanoic acid = 8.50 g

Molar mass of butanoic acid = 88 g/mol

Moles of ethyl butyrate = 0.097

Molar mass of ethyl butyrate= 116 g/mol

brainless, please

Grams of ethyl butyrate produced : 11.27 g

A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.

The reaction between Butanoic acid-C₄H₈O₂ and an excess Ethanol-C₂H₅OH to produce ethyl butyrate-C₆H₁₂O₂ :

C₄H₈O₂+C₂H₅OH⇒C₆H₁₂O₂+H₂O

mass Butanoic acid- C₄H₈O₂= 8.55 g, so mol C₄H₈O₂ (MW=88,11 g/mol) :

[tex]\tt \dfrac{8.55}{88.11}=0.097[/tex]

[tex]\tt \%yield=\dfrac{actual}{theoretical}\times 100\%[/tex]

For 100% yield ⇒ actual=theoretical

Because Ethanol as an excess, so Butanoic acid as a limiting reactant and mol Ethyl butyrate based on mol Butanoic acid

From equation, mol ratio of mol C₆H₁₂O₂ : mol C₄H₈O₂ = 1 : 1, so : mol C₆H₁₂O₂=mol C₄H₈O₂= 0.097

mass C₆H₁₂O₂(MW=116.16 g/mol)

[tex]\tt 0.097\times 116,16 g/mol=11.27~g[/tex]

Answer:

Explanation:

Electron configurations and the periodic table. Elements are placed in order on the periodic table based on their atomic number, how many protons they have. In a neutral atom, the number of electrons will equal the number of protons, so we can easily determine electron number from atomic number.

The Molarity of volumetric flask 1 : 1.26 M

The Molarity of volumetric flask 2 : 0.06 M

Dilution is a process of decreasing the concentration of a solution by adding a number of solvents

Can be formulated

M₁V₁=M₂V₂

M₁ = Initial Molarity

V₁ = Initial volume

M₂ = Final Molarity (after dilution)

V₂ = Final volume (after dilution)

Volume of volumetric flask = 500 ml

[tex]\tt M_1.V_1=M_2V_2\\\\9\times 0.07=M_2.0.5\rightarrow M_2=1.26[/tex]

[tex]\tt M_1.V_1=M_2V_2\\\\1.26\times 0.023=M_2\times 0.5\rightarrow M_2=0.06[/tex]

Answer:

I can only see b

Explanation:

Answer:

Carbon- 11 has 6 protons in its nucleus and boron- 11 has 5 protons in its nucleus.

Explanation:

note: Carbon has an atomic number of 6

and Boron has an atomic number of 5.

Answer:

B.

Explanation:

Glucose and oxygen.

Answer:

Ionic Bonds - A bond between metal and nonmetal elements. Involves transferring electrons. Covalent Bonds - Also known as molecular bonds. A bond between two nonmetals

Answer:

ionic bonds

Explanation:

A bond between metal and nonmetal elements. Involves transferring electrons.