A solar eclipse occurs during the day and can occur only during what phase of the moon?

New moon

Full moon

Answer:

crust .......

.........

Answer:Full moon

Hope this helps :)

A lunar eclipse can occur only at full moon.

Explanation:

During a lunar eclipse, Earth comes between the Sun and the Moon, blocking the sunlight falling on the Moon. A total lunar eclipse occurs when the Moon and Sun are on opposite sides of Earth. A partial lunar eclipse happens when only part of Earth's shadow covers the Moon.

Answer:

"Full moon"

A full moon would be needed due to the fact that the sun would need to entirely block it, resulting in a solar eclipse. Hence, the answer is "Full moon".

Answer:

30 protons

Explanation: Each zinc isotope contains 30 protons, 30 massive, positively charged nuclear particles

30 protons, 34 neutrons, and 30 electrons.

Answer:

162.4 cm

Explanation:

please give brainliest award

Answer:

the people injected with the drug are the variable group while the people injected with the harmless solution are the control group

Answer:

1409725 m^3

Explanation:

volume = length * width * height

volume = (1.07e2) * (31) * (4.25e2)

volume = 1409725 m^3

Answer:

i think it might be 3.8 milligrams but to be honest i dont know im just trying to help

Explanation:

Using value of 1.1×10−10 for the Ksp, 1.0 milligrams of Ag₂CrO₄ will dissolve in 11.5 mL of H₂O.

Mass is defined as the quantity of material that makes up a thing, whereas weight is the force that an object produces. A particle's or an object's mass is a dimensionless number that indicates how much matter is present. Gravity and inertia, which are the two main forces influencing how objects move in space, make mass crucial.

Ag2CrO4 dissociates to form Ag2CrO4 (s). aq 2Ag+ + crO4 (aq)

Ksp = [2Ag+] is an expression for the solubility product constant.

[Ag+] = 2x & [CrO4-] = x 1.1 10 10 = 2[CrO4-] (2x)

2(x) = 4x3 / x = [(1.1×10−10)/4]

1/3 = 3.02 x 10-4 M

Determine the number of CrO4- moles dissolved in 10 ml of water.

Molarity of CrO4- is equal to the number of moles of CrO4- divided by the volume in liters (3.02 x 10-4 M) (10 x 10-3 L)

Number of CrO4- moles equals (3.02 x 10-4)(10 x 10-3) = 3.02 x 10-6 mole.

Number of CrO4- = Number of Ag2CrO4 moles

                             = 3.02 x 10-6 mole

Ag2CrO4's molar mass = 331.73 g/mole.

3.02 x 10-6 mole of dissolved Ag2CrO4 in water

= 0.0010 g,

= 1.0 milligram.

Thus, using value of 1.1×10−10 for the Ksp, 1.0 milligrams of Ag₂CrO₄ will dissolve in 11.5 mL of H₂O.

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Answer:

13798.18 J

Explanation:

3301 cal * 4.18 J/1 cal = 13798.18

Recall that (1 cal = 4.18 J)

The mass of Hydrogen gas produced when 10.0 g of sodium reacts with excess water is 0.44 g.

From the question,

We are to determine the mass of Hydrogen gas produced when 10.0g of sodium reacts with excess water.

From the balanced chemical equation for the reaction

2Na + 2H₂O → 2NaOH + H₂

This means

2 moles of sodium reacts with 2 moles of water to produce 2 moles of sodium hydroxide (NaOH) and 1 mole of Hydrogen gas.

Now, we will determine the number of moles of sodium present

Mass of sodium = 10.0 g

Atomic mass of sodium = 22.99 g/mol

From the formula

[tex]Number\ of\ moles\ = \frac{Mass}{Molar\ mass}[/tex]

∴ Number of moles of sodium present = [tex]\frac{10.0}{22.99}[/tex]

Number of moles of sodium present = 0.43497 mole

From the balanced chemical equation

2 moles of sodium reacts with 2 moles of water to produce 1 mole of Hydrogen gas.

Then,

0.43497 mole of sodium will react with 0.43497 mole of water to produce [tex]\frac{0.43497}{2}[/tex] mole of Hydrogen gas

[tex]\frac{0.43497}{2} = 0.217485[/tex]

∴ 0.217485 mole of Hydrogen gas was produced during the reaction

Now, for the mass of Hydrogen gas produced

Using the formula

Mass = Number of moles × Molar mass

Molar mass of H₂ = 2.016 g/mol

∴ Mass of Hydrogen gas produced = 0.217485 × 2.016

Mass of Hydrogen gas produced = 0.43845 g

Mass of Hydrogen gas produced ≅ 0.44 g

Hence, the mass of Hydrogen gas produced when 10.0 g of sodium reacts with excess water is 0.44 g.

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Answer:

Explanation:

A) The magnitude of the charges on CI and O atoms are : +0.16e and -0.16e  respectively

B)  Atom O will have a partial negative charge on the CIO molecule

C) Attached below

D) The formal charge on Cl is +3

A) Determine magnitude of charges on CI and O

Magnitude of charge = dipole moment / bond length --- ( 1 )

where : dipole moment = 1.24 D * [tex](\frac{3.34*10^{-30} C m}{1 D} )[/tex]

             Bond length = 1.60 A° * [tex]( \frac{10^{-10} m}{A^{0} } )[/tex]  

∴  Magnitude of charge = 2.56 * 10⁻²⁰ C

Note : Charge of an electron = 1.602 * 10⁻¹⁹ C

Therefore the magnitude of charges on CI and O atoms is

2.56 * 10⁻²⁰ C * [tex]\frac{1e}{1.602*10^{-19} }[/tex]  = 0.16 e

Therefore

charge on CI = +0.16e

charge on O = -0.16e

Hence we can conclude that A) The magnitude of the charges on CI and O atoms are : +0.16e and -0.16e  respectively and Atom O will have a partial negative charge on the CIO molecule also The formal charge on Cl is +3

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Answer:

1) Convert percent (m/V) to molarity

percent (m/V)=1.15 grams/100ml=1.15 g/0.1L=11.5g/L

molarity of KBr=mol/L=g/L *(1mol/molecular weight of KBr)=(11.5g/L) * (1mol/119.0g/mol)=0.0966 mol/L=0.0966M

2) calculation of osmol from mol

In solution, KBr dissociates into two ions K+ and Br- so there are 2 osmol of KBr per mol

3) calculation of osmolarity=molarity*2=0.0966*2=0.193 Osm or Osmolar

Explanation:

brainliest would be appreciated.

Answer:

1

Explanation:

x + 3 =4

subtract 3 from 4

You are left with one.

Plug in the answer

1+3=4

Answer:

A

Explanation:

it is correctly right????

Answer:

B.

The chocolate bars weigh more than 35 grams.

A. The mass (in grams) of Ce(NO₃)₄ that will be required to make the solution is 24.16 g

B. The concentration of the nitrate ions in the solution is 1.66 M

C. The new concentration of the Ce(NO₃)₄ solution is 0.178 M

We'll begin by calculating the number of mole of Ce(NO₃)₄ in the solution.

Molarity = 0.415 M

Volume = 150 mL = 150 /1000 = 0.15 L

Mole = Molarity × Volume

Mole of Ce(NO₃)₄ = 0.415 × 0.15

A. Determination of the mass of Ce(NO₃)₄ required to make the solution.

Mole of Ce(NO₃)₄ = 0.06225 mole

Molar of Ce(NO₃)₄ = 140.12 + 4[14 + (16×3)]

= 140.12 + 4[14 + 48]

= 140.12 + 4[62]

= 140.12 + 248

= 388.12 g/mol

Mass = mole × molar mass

Mass of Ce(NO₃)₄ = 0.06225 × 388.12

Therefore, 24.16 g of Ce(NO₃)₄ is required to make the solution.

B. Determination of the concentration of the nitrate ion, NO₃¯ in the solution.

In solution, Ce(NO₃)₄ will dissociate as follow:

Ce(NO₃)₄ (aq) —> Ce⁴⁺(aq) + 4NO₃¯(aq)

From the balanced equation above,

1 mole of Ce(NO₃)₄ contains 4 moles of NO₃¯

Therefore,

0.415 M solution of Ce(NO₃)₄ will contain = 0.415 × 4 = 1.66 M NO₃¯

Thus, 1.66 M of the nitrate ion, NO₃¯, is present in the solution.

C. Determination of the new concentration of the Ce(NO₃)₄ solution.

Volume of stock solution (V₁) = 150 mL

Molarity of stock solution (M₁) = 0.415 M

Volume of diluted solution (V₂) = 350 mL

Molarity of diluted solution (M₂) =?

0.415 × 150 = M₂ × 350

62.25 = M₂ × 350

Divide both side by 350

M₂ = 62.25 / 350

Therefore, the new concentration of the Ce(NO₃)₄ solution is 0.178 M

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Answer:

c

Explanation:

because your separating the atoms in the water

The appropriate model for nuclear fission is disturbing a drop of water such that it breaks into smaller droplets.

Nuclear fission refers to the disintegration of a large nucleus when it is bombarded with a small particle.

Usually, the protons in the nucleus repel each other strongly. Hence, as the atomic number of atoms continues to increase, this repulsion exceeds the nuclear attractive force causing the atom to disintegrate into smaller fragments called daughter nuclei when disturbed just as a drop of water such that it breaks into smaller droplets  when disturbed.

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Answer:

Only C. is wrong else every option is correct.

Explanation:

Hope this helps you. If you want explanation then ask in comments. Good luck!

Answer:

C. A Spring Scale

Explanation:

Using process of elimination, we can quickly decide that a stopwatch and a ruler will not be useful in measuring the force. This leaves us with either the spring scale or a balance scale. A balance scale is used to compare two weights, so this is eliminated. That leaves us with a spring scale. This is because we can attached the spring scale to the car and when we let it go, we can record the force. I hope this helps!

Answer:

hot to cold matter

The characteristics of the ocean ridges allow finding the results to complete the statements are:

The oceanic ridges are mountain ranges or chains of volcanic mountains at the bottom of the ocean, in these the magma that rises cools and forms young rocks, in they are pushed by the other rocks that emerge, in general they are located on the edges of the tectonic plates .

Therefore, the oceanic ridges are the point where the earth's crust is separating, therefore it has the youngest rocks and in the furthest points it has the oldest.

Let's find the correct words for each phrase to be correct:

As a consequence of the characteristics of the ocean ridges, we can find the results to complete the statements  are:  

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Answer:

A

Explanation:

Another way to say Density is Density

Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property. The  density is mass divided by volume. the correct option is option A.

Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water. Density is mass divided by volume.

Mathematically, density can be written as : Density = Mass of the substance÷ volume marked on the graduated cylinder. Density is directly proportional to mass and inversely proportional to volume. Density of water is 1 gram per cubic centimeter.

Therefore, density is mass divided by volume. the correct option is option A.

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Answer:

2 electrons

Explanation:

Oxygen has 6 valence electrons and to be stable it needs 8. That means it needs 2 more electrons to have a full octet.

Answer:

A a chemical change

Explanation:

because a chemical change is when you mix tow substance together and they creat a new substance

Answer:

1200 milligrams