Please answer quickly

Answer: because atoms have more protons

Explanation: just took the test

Answer:

It's called the shielding effect

Explanation:

It describes the decrease in attraction between an electron and the nucleus in any atom with more than one electron shell. (I hope this helps)

The attraction pull of the nucleus on its electron weakened by the shielding of the inner shell electron is called the shielding effect.

The shielding effect is the valence electrons are shielded from the attraction toward the nucleus of an atom. The shielding effect is the resistance offered by the inner shell electrons to the attraction of the valence electrons toward the nucleus.

This effect increases down the group in the periodic table as the atomic radii also increase and remains the same in the period. This effect is generated by the electrons present in the middle of the nucleus and valence electrons act as shields that repel those outer electrons.

Therefore, the effective nuclear charge acting on the valence electrons decreases. More shielding effect causes less electronegativity of an atom. The shielding effect describes how easily the electron can be removed from the atom making it more reactive.

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Here we need to see the differences between a liquid and a gas, and how that affects the volume and effects of pressure on them.

The correct option is:

Gases are more readily compressed than liquids are because there is more space  between the particles in a gas than in a liquid.

So we have two syringes, one with air and the other with water.

The student applies the same amount of pressure to both of them, but as water is denser than air, in a given change dV of volume in the syringe, the mass of water is larger than the mass of air.

This means that for the same pressure, we should expect the change in volume to be smaller in the syringe with water.

Why this happens?

Gases are more readily compressed than liquids are because there is more space  between the particles in a gas than in a liquid.

This means that for the air is easier to be compressed (the distance between particles is larger, so the same pressure compresses more a gas than a liquid) and exit the syringe than for the water, and this translates to the change in volume per unit of pressure applied, which is larger for gases than liquids.

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Answer:

forsterite

Explanation:

A student makes two mixtures, both made of the same substances. Both mixtures can be physically separated into its components. Therefore, option C is correct.

A substance made up of two or more separate chemical compounds that are not chemically linked is referred to as a mixture. A mixture is the physical blending of two or more substances while maintaining their distinct identities. It can take the form of solutions or suspensions.

A pure substance is a single sort of matter that cannot be divided into other kinds of matter by any physical methods. A pure substance has a known and consistent composition at all times.

When two or more distinct substances physically join, a mixture is produced that can be dispersed back into its constituent parts. When two or more compounds combine to create a new substance that cannot be broken down into its constituent parts, a chemical reaction takes place.

Thus, option C is correct.

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Answer:

Yes

Explanation:

Electronegativity is the tendency for atoms to keep electrons closer to them. So, if the atoms are smaller there, there is a stronger pull on the electrons to keep them closer. So, the larger the atom get, due to electron shielding, it become less electro negative. I hope this help. You might get a better explanation from Khan Academy's video on Electronegativity

Answer:

A relationship is intuitively expected

Does electronegativity relate to atomic radius? A relationship is intuitively expected between electronegativity and radius: the size of an atom is determined by the distribution of electrons around its nucleus. The closer the electrons are to the nucleus, the more tightly they are bound, thus increasing the electronegativity of the atom.

Explanation:

Answer:

0.5 mol of nitrogen gas.

Explanation:

18g of Magnesium in mol is equal to 18g/24 gmol-1 = 0.75 mol and 7g of nitrogen in mol is equal to 7g/14 gmol-1 = 0.5 mol,

Thus, When 18g of magnesium reacts with 7g of nitrogen it implies 0.75 mol of magnesium which reacts with 0.5 mol of nitrogen. :)

The number of moles of nitrogen gas which react with 18 g of magnesium

to form magnesium nitride compound is 0.5mol.

We need to find the number of mole for magnesium and nitrogen.

Mole= mass/molar mass

Magnesium= 18g/24gmol⁻¹ = 0.75mol of Mg

Nitrogen= 7g/14gmol⁻¹ = 0.5mol of N

This implies that when 18g of magnesium reacts with 7g of nitrogen it

means 0.75 mol of magnesium which reacts with 0.5 mol of nitrogen.

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Answer:

Decompositon

Explanation:

Sodium chlorate → Sodium Chloride + Oxygen

Sodium chlorate is reactant.

Sodium chloride + Oxygen is the product.

Definition : -

Decomposition reaction is a chemical reaction in which a single reactant breaks down to simpler products.

Answer:

4) 2Na + Cl2 → 2NaCl

5) 2Mg + O2 → MgO

6) 2H2 + 2O2 → 2H2O

Explanation:

4) In order for it to be well balanced, yeah you've got to add 2 in front of Na before the reaction and after the reaction.

5) Add 2 in front of Mg bcuz of the same reason in number 4 but you don't have to add 2 in front of the others bcuz it's alrd well balanced.

6) Tbh for this one, it got me staring at my cat until he freaks out but like yeahh, I tried :')

Answer:

Alkali metals are highly reactive metals. These metals are that much reactive that they can even explode in the air as well. When alkali metals and water react with each other, there is a formation of metal hydroxide and the evolution of hydrogen gas.

The general representation of metal is A. so, the general equation for the reaction of an alkali metal with water is given below.

2A(solid)+2H2O(liquid) -------> 2AOH(aqeous)+H2(gas)

C. Point 3

Explanation:

Because it is increasing dramatically

Answer:

• Oxygen is an element

Answer:

We can call it an element.

Answer:

VELOCITY

Explanation:

VELOCITY IS THE SPEED AND DIRECTION OF MOVEMENT

Explanation:

velocity

reason: The velocity of an object is the rate of change of its position with respect to a frame of reference, and is a function of time. Velocity is equivalent to a specification of an object's speed and direction of motion (e.g. 60 km/h to the north).

Answer:

The answer is 375.54 g of AgBr

Explanation:

Mass (g) = Concentration (mol/L) x volume (L) x Molecular Weight of AgBr (g/mol)

Mass = 2M x 1L x 187.77 g/mol

Mass = 375.54g

it's an ionic bond

btw i love your profile picture never understand is one of my favorites

x21 +ANSWER

(i) Ne-22

(ii)1s2s22p6

(iii)21.3

An element X exists in three forms A, B and C in the ratio 1:2:3. If C has 10 protons and the number of neutrons in A, B and C are 10, 11 and 12 respectively,Give the following:(i) Representation of form C of the element X(ii) Electronic configuration of form B of the element(iii) Calculate the average atomic mass.

(i)C  has 10 protons and 12 neutrons so a mass of 10 +12 =22

element 10 is Neon (Ne) so this isotope is Ne-22

(ii) they all have the sane atomic number so the same number of electrons

with an electronic structure of 1s2s22p6

(iii) A weighs 20, B weighs 21, C weighs 22

the ratio is 1:2:3

weighted average weight is therefor

(1X20 +2X21 +3X22)/6 =21.3

Explanation:

A balanced equation demonstrates the conservation of mass by having the same number of each type of atom on both sides of the arrow. enjoy

Answer:

It show that no atoms have been gained or lost during reaction

Explanation:

Answer:

Ionic compounds are electrically neutral because the charges of the cations and anions that make up the compound cancel each other out. In the case of salt for example, sodium has a charge of positive one, and chloride has a charge of negative one. Together, they neutralize the compound.

Explanation:

Answer:

A. W and X

Explanation:

Because W have just one valence electron, and X have 7, so it means that W will give its electron to X and that's the definition of an ionic bond

Answer:

A ) 1, 2 and 3

Explanation:

1 ) is correct because,

K donates 1 electron

F gain 1 electron from K.

If donating and gaining of electrons takes place between two electron, then type of compound formed is ionic.

2 ) is correct because,

K + F -----> KF

3 ) is correct because,

KF is soluble in cold water; very soluble in hot water.

Answer:

Map scale refers to the relationship (or ratio) between distance on a map and the corresponding distance on the ground.

Explanation:

For example, on a 1:100000 scale map, 1cm on the map equals 1km on the ground.

Answer:

The grater the difference in electronegativity, the more ionic the bond

Answer:

I think it is

1. energy

2. respiration

Answer:

The mixture has no fixed composition.

To form a mixture energy is neither produced nor evolved.

The mixture has no fixed melting points and boiling points.

the Mixture retains the properties of its components.

Components of mixtures can be separated by simple physical methods.

Bromine needs to gain one more electron to have a noble gas configuration or 8 valence electrons, & potassium needs to lose one so they make a transference of electrons in an ionic bond.

Ionic bonding is a type of chemical bonding that involves the electrostatic attraction between oppositely charged ions, or between two atoms with sharply different electronegativities, and is the primary interaction occurring in ionic compounds.

Ionic bonding results in compounds known as ionic, or electrovalent, compounds, which are best exemplified by the compounds formed between nonmetals and the alkali and alkaline-earth metals.

The charge of a cation or anion is denoted as a superscript after the formula of the ion. A + sign denotes a positive charge resulting from loss of electrons. A - sign denotes a negative charge resulting from gain of electrons.

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Answer:

a. Azane

b. sulphur hexachloride

c.carbon tetrachloride

d. Carbon disulfide

e.Umbelliferone

f.Disilicon hexabromide

g. Dinitrogen trifluoride

h.