Please help! This is due in 10 minutes!

Answer:

40

Explanation:

8 + 8 + 8 + 16

Answer:

Ion

Explanation:

I'm pretty sure yhi

Answer:

4. O^2-

Explanation:

O^2 has 16 electrons, while Ne has 18 electron. O^2- is a molecule that has one electrons added to each atom, meaning that there are two extra electrons. Which makes O^2 the same electron configuration as an atom of neon.

The ions having same electronic configuration as neon are Calcium, oxygen, and chlorine ion. Thus, options 1, 2, and 4 are correct.

The electronic configuration has been defined as the electron address in a atom. The electronic configuration has been based on the quantum rule for the filling of the electrons.

The number of electrons present in Neon has been 18. Thus, the ion with the presence of 18 electrons has same electronic configuration as Neon.

The number of electrons in the following ions are:

[tex]\rm Ca^{2+}=18\\Cl^-=18\\Li^+=4\\O_2^{-}=18[/tex]

The number of electrons of calcium ion and chlorine ion are similar to the number of electrons of Ne. Thus the ions having same electronic configuration as neon are Calcium, oxygen and chlorine ion. Thus, options 1, 2, and 4 are correct.

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Answer:

yes the schools should be poghers for once only:)

Om sister

6 C

7 A

8 C

9 D

10 B

Answer:

Pressure

Explanation:

Apply the definition of pressure to this problem.

Answer:

energy or pressure

Explanation:

Answer:

The differences between compound and mixtures in a tabular form are as follow:

Both are written differently. Plz do write by making table at once.

Hope it help you

Answer:

You can get calcium from foods and it helps to build strong bones. You can also get iron from food and it helps with blood health. Vitamin C and D3 are also common and help with immune health and D3 and biotin helps with the growth of hair, nails and skin health.

Explanation:

Answer:

4.4045358859215327e-17 nm

Explanation:

Hope this helped!

Answer:

But its motion is not changing. This is because the forces acting on it from opposite sides are exactly the same size. An unbalanced force can change an object's motion. ... An unbalanced force acting on a moving object could make the object change direction, change speed, or stop moving.

The unbalanced forces are unequal in magnitude. They change the state of motion of the object. The pushing or pulling of an object can generate unbalanced forces and cause change in the direction, and position of an object.

The two forces of unequal magnitudes and they act on an object simultaneously such that the net force is not zero are defined as the unbalanced forces. The body acted upon by the unbalanced forces changes its state of motion.

The unbalanced forces are the opposite of a balanced force. An unbalanced force causes a change in motion, speed, direction, or movements. Because of unequal force or strength which is applied to one side of an object.

In the case of unbalanced forces, one side has more energy than the other. Opposite sides have forces acting against them.

Thus the unbalanced forces are out of balance and are not equal, it causes body's position to change.

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Sucrose solution is an example of sugar solution. Details about a solution can be found below.

A solution is a mixture, which may be liquid, gas or solid, formed by dissolving one or more substances.

A solution is formed when a solute substance dissolved in a solvent.

For example; sucrose is a solute molecule that dissolves in water to form a sucrose solution.

It is important to note that sucrose solution is hypertonic to water i.e. it is a more concentrated solution. There is a net movement of water molecules, by osmosis from the water outside to the sucrose solution.

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Answer:

B. Light

Explanation:

Light is converted into energy during photosynthesis

Answer:

160.32 grams of Ca or 160 if rounded

Explanation:

Multiply moles of Ca by the conversion factor (molar mass of calcium) 40.08 g Ca/ 1 mol Ca, which then allows the cancelation of moles, leaving grams of Ca.

4 mol*40.08g/mol = 160.32 grams of Ca

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Answer:

[tex]\boxed {\boxed {\sf 160.32 \ g, \ 160 \ g, \ or \ 200 \ g }}[/tex]

Explanation:

To convert from grams to moles, we must use calcium's molar mass, which can be found on the Periodic Table of Elements.

Now, we can use the molar mass as a ratio or fraction.

[tex]\frac{40.08 \ g \ Ca}{1 \ mol \ Ca}[/tex]

This fraction can be multiplied by the number of moles, which is 4.

[tex]4 \ mol \ Ca * \frac{40.08 \ g \ Ca}{1 \ mol \ Ca}[/tex]

When we multiply, the moles of calcium will cancel each other out.

[tex]4* \frac{40.08 \ g \ Ca}{1}[/tex]

Since the fraction is over 1, we can just remove the denominator and write a simply multiplication equation.

[tex]4* 40.08 \ g \ Ca[/tex]

[tex]160.32 \ g \ Ca[/tex]

Depending on the teacher's instructions, the answer can be left as is or rounded.

If we round to the technically correct number of significant figures, it would be 1, because the original measurement of 4 moles has 1 sig fig. This would 200 grams, but that's a large amount to round.

We could also round to the nearest whole number. The 3 in the tenth place tells us to leave the whole number as it is. This would be 160 grams.

The answer could be 160.32 grams, 160 grams, or 200 grams, depending on rounding and significant figures.

Answer:

d.

Explanation:

because its right :)

The statement among the following which best describes a decomposition reaction is a Single complex substance breaks down in to two or more simpler substances.Hence, Option (D) is correct.

Chemical decomposition, or chemical breakdown, is the process or effect of simplifying a single chemical entity into two or more fragments.

Chemical decomposition is usually regarded and defined as the exact opposite of chemical synthesis.

Therefore, The statement among the following which best describes a decomposition reaction is a Single complex substance breaks down in to two or more simpler substances.Hence, Option (D) is correct.

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Answer:

C = 9460 Kj

Explanation:

Given data:

Mass of copper = 2kg

Latent heat of vaporization = 4730 Kj/Kg

Energy required to vaporize 2kg copper = ?

Solution:

Equation

Q= mLvap

by putting values,

Q= 2kg ×  4730 Kj/Kg

Q = 9460 Kj

Answer:

Q = 9460 Kj

Explanation:

Given data:

Mass of copper = 2kg

Latent heat of vaporization = 4730 Kj/Kg

Energy required to vaporize 2kg copper = ?

Solution:

Equation

Q= mLvap

It is given that heat required to vaporize the one kilogram copper is 4730 Kj thus, for 2 kg

by putting values,

Q= 2kg ×  4730 Kj/Kg

Q = 9460 Kj

Answer:

The exposure between the fuel rods and a neutron-absorbing material is increased.

Explanation:

The exposure between the fuel rods and a neutron-absorbing material is increased.

A nuclear reactor produces energy via a fission reaction. A fission reaction is a self sustaining reaction.

The nuclear fuel is bombarded with neutrons. The process produces more neutrons which continues the reaction.

In order to decrease the rate of reaction, control rods are inserted. These control rods are neutron-absorbing materials.

At night when demand for electricity decreases, the exposure between the fuel rods and a neutron-absorbing material is increased so that more neutrons are absorbed in order to decrease the rate of nuclear reaction.

Answer:

The charge carried by each ion (oxidation state of each atom)

Explanation:

If we have an ionic compound and we want to write its formula, we must first know the magnitude of charge on each ion (shown as oxidation state of the atoms involved) because the magnitude of charge on each ion is eventually crisscrossed and gives the subscript (number of atoms) for each atom in the formula.

For instance, let us write the formula of calcium bromide. Ca has a charge of +2 while Br has a charge of -1. If we exchange the charges and ignore the signs such that the crisscrossed charges form subscripts we can now write; [tex]CaBr_{2}[/tex].

Answer: i need a pic of it plz

Explanation:

plx

Answer:

Compound

Explanation:

Sodium chloride, commonly known as salt, is an ionic compound with the chemical formula NaCl, representing a 1:1 ratio of sodium and chloride ions. With molar masses of 22.99 and 35.45 g/mol respectively, 100 g of NaCl contains 39.34 g Na and 60.66 g Cl

Answer:

Since a 1W appliance will use 1 joule of energy every second, a 1500W appliance will use 1500 joules of energy every second. Hence, it will use 90000 joules of energy per minute, 540000 joules per 6 minutes (per day), and 1620000 joules of energy across all 3 days.

TL;DR 1620000 joules of energy would be used.

Explanation:

Hope this helped!

Answer:

D

Explanation:

The correct answer that gives a good example of how the same chemical used to help people can harm the environment would be when excess fertilizers run off into rivers and create a dead zone.

Fertilizers are usually applied to crops as an agricultural practice by farmers to enhance the yield of the crops and boost food or raw materials production. However, excess fertilizer gets washed into nearby water bodies and ends up creating a low-oxygen zone that is incapable of supporting lives within the water body - also known as dead zones.

The correct option is, therefore, D.

Answer:

15.1  × 10²³ atoms

Explanation:

Given data:

Number of moles of manganese = 2.5 mol

Number of atoms = ?

Solution:

Avogadro number:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ atoms

2.5 mol × 6.022 × 10²³ atoms / 1 mol

15.1  × 10²³ atoms

Answer:

check explaination

Explanation:

Q. 4:

a) 7 ml

b) 9 ml

c) volume of rock = volume of column (with rock in it) - volume of column (without rock)

= 9-7

= 2 ml

d) density = mass ÷ volume

therefore, mass = volume × density

= 2 × 3 => 6 g

Q. 5:

1st has the highest density

this is because, density = mass ÷ volume

as volume is constant , density is directly proportional to mass

as image 1 has more number of molecules, it's mass will be maximum.

therefore, 1st image will have maximum density