why is earth often referd as a blue planet ?

A-When viewed from space, the biosphere always looks blue.

B-Most people like blue.

C-The sky is blue.

D-The hydrosphere looks blue and covers three-fourths of the Earth’s surface.

NEED ANSWER ASAP

Answer:

Compact fluorescent lamps, or CFLs, use 75 percent less energy than a traditional incandescent bulb, but they never quite caught on for home use.Feb

Answer:

A

Explanation:

it is round up to 20

Answer:

20 is the answer (A)

Explanation:

Neon/Atomic mass

20.1797 u

this is approximately 20 so 20 is the answer (A)

hope this helps!

Answer:carbin dioxide co^2

Explanation:

Answer:

C) Covalent bonds come about because of a sharing of electrons; ionic bonds do not.

Explanation:

There are two main types of chemical bonds- covalent and ionic/electrovalent bonds.

Ionic bond: Ionic or electrovalent bonds are characterized by the transfer of electrons from electropositive atoms (metals) to electronegative atoms (non-metals). The metal atoms after donating their electrons become positively charged ions (cations) while the non-metal atoms after accepting electrons become negatively charged ions (anions). Strong electrostatic forces of attraction constitutes ionic bonds.

Covalent bond: Covalent bonds are formed by the sharing of electrons by the atoms involved in the bond; usually between atoms of comparable electronegativities or atoms of the same element. The shared electrons are contributed by each of the atoms involved in the bonding or may be contributed by only one of the atoms. In covalent bonding, molecules rather than ions are formed.

Answer:

The corresponding wavelength is 2.4×10⁻³⁴ m.

Explanation:

Given data:

Mass of ball = 45.9 g  (45.9/1000 = 0.0459 kg)

Speed of ball = 61.0 m/s

Wavelength = ?

Solution:

Formula:

λ = h/mv

λ = wavelength

h = Planck's constant

m = mass

v = velocity

Now we will put the values in formula.

λ = 6.63×10⁻³⁴ kg.m².s⁻¹ / 0.0459 kg ×61.0 m/s

λ = 6.63×10⁻³⁴kg.m².s⁻¹ /2.8 Kg.m/s

λ = 2.4×10⁻³⁴ m

The corresponding wavelength is 2.4×10⁻³⁴ m.

Answer:

Nitric acid is a strong acid meaning it completely dissociates in water. Therefore, you can say that the concentration of H+ ions in solution is the same as the concentration of the acid (molar concentration). So once you have that, you can use the pH formula to find the pH of the acid.

pH = -log[H+]

So if you have .15 M HNO3 the pH is 0.82.

But, if you have a different concentration, the pH will change.

Explanation:

Answer:

true

Explanation:

Answer:

B

Explanation:

The rock cycle is a series of processes that create and transform the types of rocks in Earth’s crust. A different type of rock is broken down or changes in some way. The correct option is B.

Sedimentary, igneous, and metamorphic rocks are the three main categories of rocks. Each of these rocks is the result of physical processes that are a part of the rock cycle, such as melting, cooling, eroding, compacting, or deforming.

Rock fragments from other types of existing rocks or organic material are used to create sedimentary rocks. Clastic, organic (biological), and chemical sedimentary rocks are the three different types of sedimentary rocks.

Rocks that have undergone extreme heat or pressure and changed from their initial state are known as metamorphic rocks. When molten, heated material cools and solidifies, igneous rocks are created (their name is derived from the Latin word for fire).

Thus the correct option is B.

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Answer:

HOPE THIS HELPED :) good luck! ❤️

Explanation:

A reactant is a substance that is present at the start of a chemical reaction. The substance to the right of the arrow are called products . A product is a substance that is present at the end of a chemical reaction.

Answer:

Reactants are the starting substances and products are the ending substances in a chemical reaction.  The atoms in reactants are arranged one way and are rearranged in a different way to form the products (in other words, reactants are chemically different from products). The properties of reactants differ from the properties of products.

Explanation:

Sample response on Edge 2021

Answer:

its Radiation

Explanation:

Because it transfers heat from a object to a less hot object in this case from a hot curling iron to your hair.

Answer:

112.5

Explanation:

I think so because in one unit has 4 oxygen atoms.

Answer:

D. 18

Explanation:

group 18 elements are called noble gases.

They have complete octet in their valance shell. Therefore, they are least likely to form bonds with other elements.

Answer:

From 22.9 g of HF 0.575  moles of tin(II) fluoride are produced.

Explanation:

Given data:

Moles of tin(II) fluoride produced = ?

Mass of hydrogen fluoride react = 22.9 g

Solution:

Chemical equation:

SnO + 2HF    →    SnF₂ + H₂O

Number of moles of HF:

Number of moles = mass/ molar mass

Number of moles = 22.9 g/ 20 g/mol

Number of moles = 1.15 mol

Now we will compare the moles of SnF₂ with HF.

              HF           :             SnF₂

               2             :               1

            1.15            :             1/2×1.15 = 0.575 mol

Thus, from 22.9 g of HF 0.575  moles of tin(II) fluoride are produced.

Answer:

The cube

Explanation:

When the cube is put on the triple beam balance it gives the mass of 429.3

Answer:

b

Explanation:

jus bc

Fluorine F₂ is the correct formula for two atoms in sharing of electrons as they have covalent bond among them. Therefore, option (A) is correct.

A covalent bond is created through sharing of electrons between different or the same kinds is known as a covalent Bond.

A covalent bond has equal sharing of electrons among bonded atoms. The pair of electrons which is shared between atoms is known as shared pair.

Sharing of electrons will help atoms to attain stability in their valence shell as noble gases. Atoms share their electrons with the other atoms in a way so that both atoms can gain octet configuration in their valence shell.

The bond between two fluorine atoms is a covalent bond formed by sharing of electrons. The Bond between sodium and chlorine in NaCl, KBr, and CaCl₂ is an ionic bond formed by the complete transfer of electrons.

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Answer:

[tex]0.000056[/tex]

Explanation:

If [tex]pH[/tex] is given then hydronium ion concentration is equal to [tex]-log[H_3O^+][/tex]

The hydronium ion concentration can be found from the pH using the following formula:

Hydronium ion concentration = [tex]10^{-pH}[/tex]

As the pH of a HClO4 solution was measured as 4.251,

put [tex]pH=4.251[/tex]

So,

Concentration of HClO4 in the solution = [tex]10^{-4.251}=0.000056[/tex]

Answer:

C02+2CL2 = O2+CCL4​

Explanation:

the co2 gave its carbon atom to the CL2 + CCL4​

Answer:

Explanation:

Thank you ☺️☺️

Answer:

Approximately [tex]1.04\; \rm L[/tex] of the [tex]12.0\; \rm M[/tex] [tex]\rm NaOH[/tex] solution is needed. Approximately another [tex]3.96\; \rm L[/tex] of water will also be required.

Assumption: the volume of these [tex]\rm NaOH[/tex] solutions does not depend on the quantity of [tex]\rm NaOH\![/tex] (the solute) that each of them contain.

Explanation:

Calculate the number of moles of [tex]\rm NaOH[/tex] formula units in that [tex]5.00\; \rm L[/tex] of [tex]2.50\; \rm M[/tex] [tex]\rm NaOH\![/tex] solution:

[tex]n(\mathrm{NaOH}) = c\cdot V = 5.00\; \rm L \times 2.50\; \rm mol \cdot L^{-1} = 12.5\; \rm mol[/tex].

Calculate the volume of a [tex]12.0\; \rm M[/tex] [tex]\rm NaOH[/tex] with that many [tex]\rm NaOH\![/tex] formula units:

[tex]\displaystyle V = \frac{n}{c} = \frac{12.5\;\rm mol}{12.0\; \rm mol \cdot L^{-1}}\approx 1.04\;\rm L[/tex].

That should be the volume of the [tex]12.0\; \rm M[/tex] [tex]\rm NaOH[/tex] solution needed to prepare that [tex]5.00\; \rm L[/tex] of [tex]2.50\; \rm M[/tex] [tex]\rm NaOH\![/tex] solution. However, [tex]1.04\; \rm L[/tex] corresponds to only about one-fifth the volume of a [tex]5.00\; \rm L\![/tex] solution. The difference in volume should be filled with pure water:

[tex]\begin{aligned}V(\text{water}) &\approx 5.00\; \rm L - 1.04\; \rm L = 3.96\; \rm L\end{aligned}[/tex].

Answer:

Yes

Explanation:

As the number of animals that eat plants increase, the number of plants decrease. This is because the animals are eating a larger and larger number of plants and reducing the population.

When the number of plants gets too low, the animals will not be able to survive, and they will start to decrease in numbers. In turn, the plants will increase again. Eventually, they will reach an equilibrium.

Answer:

Aluminium

Explanation:

From the question given above, the following data were obtained:

Diameter (d) = 1.25 cm

Height (h) = 6.48 cm

Volume (V) of cylindrical=.?

Mass (m) of cylindrical object = 21.535 g

Density of the cylindrical object =..?

Next, we shall determine the radius of the cylindrical object. This is illustrated below:

Diameter (d) = 1.25 cm

Radius (r) =?

r = d/2

r = 1.25/2

Radius (r) = 0.625 cm

Next, we shall determine the volume of the cylindrical object. This can be obtained as follow:

Height (h) = 6.48 cm

Radius (r) = 0.625 cm

Pi (π) = 3.14

Volume (V) of cylindrical=.?

V = πr²h

V = 3.14 × 0.625² × 6.48

V = 7.948 cm³

Recall:

1 cm³ = 1 mL

Therefore

7.948 cm³ = 7.948 mL

Thus, the volume of the cylindrical object is 7.948 mL

Finally, we shall determine the metal in which the cylindrical object is made up of by calculating the density of the cylindrical object. This can be obtained as follow:

Mass (m) of cylindrical object = 21.535 g

Volume of the cylindrical object = 7.948 mL

Density of cylindrical object =?

Density = mass /volume

Density = 21.535 / 7.948

Density of cylindrical object = 2.7 g/mL

Comparing the density of the cylindrical object (i.e 2.7 g/mL) with those given in the table in the question, the cylindrical object is made of aluminium since they have the same density.

Answer:

I need to se the options

Answer:

False

Explanation:

Answer:

coochie man? lol it's probably D or B :D

Answer:

it means a hamburger has less calories bc its referring to steak that has been grounded and the highlight would be calories

Answer:

b.) 100 meters c.) 6 seconds d.) 16.6 e.) 16.6m/s

Explanation: