CAN SOMEONE PLEASE HELP ME WITH THIS

Answer:

E = 21.22 ×10⁻³⁶ J

Explanation:

Given data:

Energy of photon = ?

Frequency of photon = 3.2×10⁻² Hz

Solution:

Formula:

E = hf

h = 6.63×10⁻³⁴ Js

Now we will put the values in formula.

E = 6.63×10⁻³⁴ Js × 3.2×10⁻² Hz

E = 21.22 ×10⁻³⁶ J    (Hz= s⁻¹)

Answer:

The number "1.25" is already at a number that shouldn't be determined using scientific notation. Do you want 1.25ml----> liters ? If so, here

Explanation:

1.25 × [tex]10^{-3}[/tex]

is the amount of liters

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Answer:

taste receptor

Explanation:

Good luck :)

Do you go to Millbrook? 23.9kPa

Answer: a full s and a full p sublevel

Explanation: "noble gases. They are an especially important group of the periodic table because they are almost completely unreactive, due to their completely filled outermost s and p sublevels."

Answer: Determination of Equilibrium Constant, Determination of Solubility Products, Determination of pH, Determination of Activity Coefficients,

Explanation:

Answer:

u didnt attach an image or anything so this is quite confusing.

Explanation:

??

Answer:

Okay

Explanation:

Answer:

I'm Pretty Sure It Would Be C

Answer:

C it is yeah...°∆°

Explanation:

......

Answer:

1 : any of more than 100 substances that cannot by ordinary chemical means be separated into different substances Gold and carbon are elements. 2 : one of the parts of which something is made up There is an element of risk in surfing. 3 : the simplest principles of a subject of study the elements of arithmetic.

Explanation:

Answer:

The error of an experiment is the difference between the experimental and accepted values. If the experimental value is less than the accepted value, the error is negative. If the experimental value is larger than the accepted value, the error is positive.

Explanation:

I hope that helped if it did mark me brainlest! i really need it :(

Answer: Crocodile is a reptile whereas sheep and gorilla are the mammals.

Explanation:

Crocodile, sheep, and gorilla have alimentary canal in their digestive system. The urea is the common excretory waste.

Mouth is typically large in case of crocodile and comparatively small in sheep and gorilla.

In crocodile more sharp teeth are present as compared to sheep and gorilla for mastication of food and capturing the prey like fish or large animals like zebra.

The crocodile palate is more stronger than sheep and gorilla because it enable it to chew the bones of the prey.

Answer:

Protons and neutrons

Explanation:

The particles to forms the nucleus of an atom are the protons and neutrons of the atoms.

These materials are located in the tiny nucleus and contributes the most mass of the atom.

Answer:

cnidarians, mollusks, annelids, arthropods,

Explanation:

Living organisms have been grouped using a system of classification that runs from Kingdom to Species. One of those kingdoms is KINGDOM ANIMALIA, which consists of animal species i.e. organisms that are strictly heterotrophic and eukaryotic.

The next taxa after kingdom is PHYLA. According to this question, the phyla which consists of only animals are cnidarians, mollusks, annelids, arthropods. Other options contain ferns, mosses, and flowering plants which belong to Kingdom Plantae.

Answer:

on edge its C

Explanation:

Answer:

Experiment Question, Independent & Dependent Variable, Null & Alternate Hypothesis

Explanation:

Experiment Question : Whether fine cloth coverage over chicken jars effect flies & their eggs in ambience ?

Independent Variable : The causal variable, ie cloth cover existence on the chicken jar

Dependent Variable : The resultant variable, ie presence of flies & their eggs near jar, meat

Null Hypothesis [H0] : Cloth cover on chicken jar doesn't effects flies' & eggs' presence around jar, chicken.

Alternate Hypothesis [H1] : Cloth cover on chicken jar effects flies' & eggs' presence around jar, chicken.

Answer:

c

Explanation:

Sunlight heating the sand on the beach on a hot summer day is an example of radiation which is electromagnetic radiation.

The electromagnetic radiation consists of waves made up of electromagnetic field which are capable of propogating through space and carry the radiant electromagnetic energy.

The radiation are composed of electromagnetic waves which are synchronized oscillations of electric and magnetic fields . They are created due to change which is periodic in electric as well as magnetic fields.

In vacuum ,all the electromagnetic waves travel at the same speed that is with the speed of air.The position of an electromagnetic wave in an electromagnetic spectrum is characterized by it's frequency or wavelength.They are emitted by electrically charged particles which undergo acceleration and subsequently interact with other charged particles.

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Answer:Nonmetals and rubber

Explanation: hope this helps

Answer:

phosphorus

Explanation:

non-metals are poor conductors

Answer: Hydrogen fluoride

Explanation:

90 grams. When the state of an object changes, the mass doesn’t change.

*edited*

Explanation:

The dangers of ballooning were apparent to aeronauts and the general public. From the early 1800s, attempts to fly over water too often ended in disaster or a narrow escape. Some of the best known aeronauts on both sides of the Atlantic set off across a large body of water never to be seen again.

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\ [/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

[tex]n = \frac{3.612 \times {10}^{24} }{6.02 \times {10}^{23} } \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

a) The balloon filled with helium will float higher because helium is less dense than gas X

Explanation:

Since gases are known to not have fixed density, they take up the density of their containers, let us find the density of the gas in first balloon.

 Density is the mass per unit volume;

         Density  = [tex]\frac{mass}{volume}[/tex]  

Insert the parameters and solve;

    mass of gas  = 7.52g

     volume of the gas  = 27.8L

          Density  = [tex]\frac{7.52}{27.8}[/tex]   = 0.271g/L

Let us compare the two densities;

 Density of gas  = 0.271g/L

 Density of helium  = 0.179g/L

We see that the density of the gas is higher than that of helium, so, it not float as high as the balloon with helium. The balloon with helium is lighter.

Answer: A

Explanation: Potassium is a metal.

Answer:

Dana filtered the sample and larger granules of the sample were left behind.

Explanation:

If a substance is pure, it will have a uniform composition throughout. It will not separate into particles of various sizes.

One of the characteristics of pure substances is that they are homogeneous. A mixture is definitely made up of particles of various sizes.

Since the particles was filtered and larger granules were left behind, the sample has been separated by a physical method (filtration). Only a mixture can be separated by physical methods. It is not a pure substance.

Answer:

i am not sure but

Explanation:

b and c should be correct

Answer:b and D

Explanation:

um this is kinda weird I am take a guest SIF4

The formula that represents a tetrahedral molecule is SiF₄. The correct option is the fourth option - SIF4

From the question,

We are to determine which of the given formulae represents a tetrahedral molecule

In order to determine the molecule that represents a tetrahedral molecule, we will determine which of the molecules has a tetrahedral molecular geometry.

A tetrahedral molecular geometry has a central atom located at the center with four substituents that located at the corners of a tetrahedron

Among the given options, the molecule that has four substituents is SiF₄. Si is the central atom and the F atoms are the substituents.

Hence, the formula that represents a tetrahedral molecule is SiF₄. The correct option is the fourth option - SIF4

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Answer:

Volume

Explanation:

yo brother these are so easy, just study bro. I helped you answer 3 already lol

whatever.

Hope I helped :)

Explanation:

molecular formula

....

Formaldehyde, CH20, and acetic acid, C2H4O2, have the same empirical formula but different molecular formulas. Therefore, option D is correct.

A chemical formula lists the elements that comprise the compound as well as the number of atoms of each element in the compound's smallest unit, whether a molecule or a formula unit. Knowing the elements' names and a few basic rules allows us to name simple compounds given a chemical formula.

Chemical formulas are classified into three types: empirical, molecular, and structural.

Empirical formulas depict the simplest whole-number ratio of atoms in a compound, whereas molecular formulas depict the number of each type of atom in a molecule and structural formulas depict how the atoms in a molecule are bonded to each other.

Thus, Formaldehyde, CH20, and acetic acid, C2H4O2, have the same empirical formula but different molecular formulas, option D is correct.

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Answer:

Mixtures can be physically separated by using methods that use differences in physical properties to separate the components of the mixture, such as evaporation, distillation, filtration and chromatography.

Answer: Acceleration

Explanation:

Acceleration.  The rate of change of an objects velocity is essentially the derivative of the velocity which is acceleration