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Answer:

NaOH (aq) + HCl(aq) → NACL(aq) + H 2O(ℓ) ΔH = −56 kJ. We have ... Ca 2+(aq) + 2 F −(aq) → CAF 2

ANSWER:

Fluorine is most electronegative atom and Fluorine atom has 1 UNPAIRED ELECTRON and so its oxidation state is –1. Fluorine does not exhibit positive oxidation state because it cannot EXPAND its octet due to non-availability of d-orbitals.

ANSWER:

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Answer:

ionic BOND JOINS HALOGEN with metals

ANSWER:

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ANSWER:

A COMPOUND of X and Y has the empirical formula XY2 It's molecule formula is 2×XY2 = X2Y4.

Explanation:

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ANSWER:

ETHANOL is to PREPARE ETHYL CHLORIDE

Answer:

STRONTIUM

Explanation:

GROUP IIA and period 5 = Strontium

Atomic NUMBER = 38

ANSWER:

REMAINS constant

Explanation:

ANSWER:

The size of particles in a solution is usually less than 1 nm. Size of particles in a SUSPENSION is usually larger than 1000 nm. In a colloid, the particles never settle down. HENCE, the Tyndall effect is always observed in COLLOIDS.

Answer:

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Explanation:

Answer:

Forming acids and alkalis

An acidic solution can be FORMED when a non-metal oxide is dissolved in water. For example, magnesium oxide dissolves to FORM alkaline solutions. SULFUR dioxide and nitrogen dioxide however, will DISSOLVE to form acidic solutions.

Answer:

N makes three covalent bonds with three Hydrogen and coordinate with one hydrogen ion (H+)to formammonium ion which is NH4+ whichforms an IONIC bond with CHLORIDE ion to FORM NH4Cl. THUS it has all the threebonds known as coordinate COVALENTBOND.

ANSWER:

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Because the size of the LAST orbital is LARGE and less energy required to removed electron so FIRST energy potential is lower than 2nd. The second electron removed takes more energy than the first because the nucleus carries a HIGHER positive charge than its electrons.

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Answer:

Inorganic acids, which are also known as mineral acids, are the acids which are derived from one or more inorganic COMPOUNDS. All inorganic acids, when dissolved in water, produce hydrogen ions (H+) and the CONJUGATE BASE ions. They are corrosive and highly soluble in water but less soluble or insoluble in organic SOLVENTS.Inorganic acids, which are also known as mineral acids, are the acids which are derived from one or more inorganic compounds. All inorganic acids, when dissolved in water, produce hydrogen ions (H+) and the conjugate base ions. They are corrosive and highly soluble in water but less soluble or insoluble in organic solvents.

ANSWER:

lonic compount have HIGH MELTING POINT

ANSWER:

WATER cycle

Explanation:

Answer:

The COLOUR of the pH paper on dipping in SOLUTION C will change to INDIGO ( purple), because it is basic in NATURE with pH value = 12.

The colour of the pH paper on dipping in solution D will change to medium green, because it is neutral in nature with pH value = 7.

Explanation:

The more acidic the pH colour will be extending yellow to red.

The more basic the pH colour will be extending BLUE to deep violet.

ANSWER:

Solution.

Explanation:

A homogeneous mixture of two or more REACTING SUBSTANCES is called a solution .

ANSWER:

∆G = ∆H-T∆S

T∆S = ∆H-∆G

= 6.02kjmol'×13.273k

=. 79.90 = ~80.=T∆S ..

EXPLANATION:

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ANSWER:

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PbCl₂ + 2KI → PbI₂ (↓) + 2KCL (aq)

the "↓" INDICATES that the formed compound is a precipitate and "aq" MEANS that the solvent of the compound formed is water

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ANSWER:

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Explanation:

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Given:

• q= 600 J
• Initial volume= 2L
• Final Volume = 12L
• Pressure = 1atm

━━━━━━━━━━━━━━━━━━━━━━

Solution:

Change in volume:

= Vfinal- Vinitial

=12L - 2L

= 10L

━━━━━━━━━━━━━━━

We know,

w= -P × Change in volume

=>w = -1 ×10 L-atm

=> w = -10 L- atm

Now 1 L-atm =101.3 J

w = -10× 101.3J

=> w = -1013 J

━━━━━━━━━━━━━━━━━

According to first law of THERMODYNAMICS,

Change in energy = q+ w

=> Change in energy = 600 - 1013 J

=> Change in energy =

Answer:

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ANSWER:

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Answer:

Explanation:

n IRON almirah is a solid at room temperature because its MELTING POINT as well as boiling point is above room temperature. ... HENCE, iron almirah is a solid at room temperature.

Answer:

N2+H2=NH3 Now BALANCING we GET N2+3H2=2NH3. HOPE it helps please MARK my answer the brainliest and follow me.

Answer:

Instructions on balancing chemical equations:

ENTER an equation of a chemical reaction and click 'Balance'. The answer will appear below

Always use the upper case for the FIRST character in the element name and the lower case for the second character. Examples: Fe, Au, Co, Br, C, O, N, F. Compare: Co - cobalt and CO - carbon monoxide

To enter an electron into a chemical equation use {-} or e

To enter an ion specify charge after the compound in curly brackets: {+3} or {3+} or {3}.

Example: Fe{3+} + I{-} = Fe{2+} + I2

Substitute immutable groups in chemical compounds to avoid ambiguity.

For instance equation C6H5C2H5 + O2 = C6H5OH + CO2 + H2O will not be BALANCED,

but PhC2H5 + O2 = PhOH + CO2 + H2O will

Compound states [like (s) (aq) or (g)] are not required.

If you do not know what products are enter REAGENTS only and click 'Balance'. In many cases a complete equation will be suggested.

Reaction stoichiometry could be computed for a balanced equation. Enter either the number of moles or weight for one of the compounds to compute the rest.

Limiting reagent can be computed for a balanced equation by entering the number of moles or weight for all reagents.

Answer:

Atomic mass of C = 12 u

Atomic mass of H = 1 u

Atomic mass of Cl = 35.5 u

Therefore, MOLECULAR mass of CHCL3 can be calculated as follows:

(1 × 12) + (1 × 1) + (3 ×35.5) = 119.5

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Answer:

REACTION of magnesium with nitrogen is a COMBINATION reaction as these two reactants ( Mg and N

2

) combine together to form a single product as magnesium nitride (Mg

3

N

2

). The equation can be written as:

3Mg(s)+N

2

(g)→Mg

3

N

2

(s)

EXPLANATION:

: In the atmosphere, the magnesium ribbon is burnt in the nitrogen gas in ORDER to form magnesium nitride which is in the solid state. On BALANCING the equation, three moles of Magnesium ribbon is treated with one mole of nitrogen to form the balanced magnesium nitride.

Explanation:

The third SHELL consists of all ORBITALS with principal quantum number n=3 . A 3s orbital has two spherical nodal surfaces, but it has no nodal planes. Each of the THREE 3P orbitals has a nodal plane perpendicular to its main AXIS. Four of the 3d orbitals have two nodal planes each.

ANSWER:

B) NON METAL to non metal

Explanation:

It has 1 lone PAIR and therefore 2 lone electrons around the CENTRAL sulphur ATOM. It's shape is a seesaw and its bond angles are 87 and 102 Login.

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Answer:

Since both POTASSIUM and magnesium LIE above hydrogen in the activity series, these and also X are more REACTIVE than hydrogen, therefore,

(a) X will react with water forming its hydroxide displacing hydrogen.

(B) X will react with hydrochloric acid liberating hydrogen and forming the CHLORIDE of X in solution.

Answer:

• Benzene is an organic chemical COMPOUND with the molecular formula C₆H₆. The benzene molecule is composed of six carbon atoms JOINED in a planar RING with one hydrogen ATOM attached to each. As it CONTAINS only carbon and hydrogen atoms, benzene is classed as a hydrocarbon.

Explanation:

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Answer:

R is RADIUS of the ORBIT. The TOTAL energy is given by - (k/2)Ze^2/r…………………….. (2). From equations (1) and (2), the ratio of kinetic energy to total energy is -1.

Explanation:

Chemistry is the study of matter, its properties, how and why substances combine or separate to form other substances, and how substances interact with ENERGY. ... Chemistry is part of everything in our lives. Every MATERIAL in EXISTENCE is made up of matter — even our own bodies.

CLASS 11 Chemistry: Chapter 1 (Some Basic Concepts of Chemistry

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ANSWER:

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Answer:

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Explanation:

Answer:

The smaller the ion , the greater is its covalent character. As Mg< Ca, [GOING down in the group atomic SIZE INCREASES ]

so , MgCl2 is more covalent

ANSWER:

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EXPLANATION:

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ANSWER:

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Explanation:

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EXPLANATION:

ANSWER is -3.4ev............

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ANSWER:

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Option A - IRON wire will become red HOT and GLOW.

_____________________________

ANSWER:

The comparisons and differences between physical and chemical changes are given below along with their examples.

...

DIFFERENCE Between Physical and Chemical Change.

Physical Change Chemical Change

A Physical change affects only physical properties i.e. SHAPE, size, etc. Chemical change both physical and chemical properties of the substance including its composition

Explanation:

INTENSIVE properties, such as density and color, do not depend on the amount of the substance present. Physical properties can be measured without changing a substance's chemical IDENTITY. Chemical properties can be measured only by changing a substance's chemical identity. MARK ME AS BRAINLIEST