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3 years ago

What is acid, base, salt?

Chemistry

1 answer:

netineya [11]3 years ago

7 0

Answer:Acid ,Base ,Salt

Explanation: An acid is defined as a substance whose water solution tastes sour, turns blue litmus red and neutralizes bases

A substance is called base if its aqueous solution tastes bitter, turns red litmus blue or neutralizes acids.

Salt is a neutral substance whose aqueous solution does not affect litmus.

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The energy of motion is called

timama [110]

Answer:I think it’s mechanical energy

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3 years ago

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Be sure to answer all parts. Acetone is one of the most important solvents in organic chemistry. It is used to dissolve everythi

Kazeer [188]

Answer:

Half life = 79.67 sec

Explanation:

Given that:

k = $8.7\times 10^{-3}\ s^{-1}$

The expression for half life is shown below as:-

$t_{1/2}=\frac{\ln2}{k}$

Where, k is rate constant

So,

$t_{1/2}=\frac{\ln2}{8.7\times 10^{-3}\ s^{-1}}$

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Half life = 79.67 sec

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3 years ago

When a substance such as ice melts, its temperature increases. Describe what happens to the arrangement of the water molecules a

gogolik [260]

Answer:

The molecules absorb heat and acquire more kinetic energy.

Explanation:

In a solid, the solids only vibrate about their mean positions but do not translate. When energy is supplied to the molecule in the form of heat, the molecules vibrate faster. Eventually, they acquire sufficient energy to leave their mean positions and translate. Hence the solid crystal collapses.

When ice is heated, water molecules acquire sufficient kinetic energy to translate. The intermolecular bonds are gradually broken in the solid framework as heat is absorbed. The heat required for this is known as the latent heat of fusion.

The temperature remains constant until phase transition is over, then temperature rise resumes.

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4 years ago

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If an olivine liquid containing 50 weight % forsterite (Fig. 8.9) were cooled slowly until it was 50% crystallized, and then all

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Answer:

0.35 weight fraction is liquid Forsterite and 0.65 weight fraction is liquid Fayolite

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The lever rule is typically used to calculate the weight fractions of phases in a binary equilibrium phase diagram. It is also used in the estimation of the fraction of solid and liquid phases for a specific binary composition and temperature condition existing between the solid and liquid lines. Therefore, using the Figure. 8.9 and the use of lever rule, the composition of the remaining liquid would be 0.35 weight fraction of liquid Forsterite and 0.65 weight fraction of liquid Fayolite.

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3 years ago

Which of the reactions are exothermic?

Nutka1998 [239]

Answer:

Reaction A, B, E and F are exothermic reactions.

Explanation:

Exothermic reactions are defined as the reactions in which energy of reactants is more than the energy of the products. In these reactions, energy is released by the system.

The total enthalpy of the reaction $(\Delta H)$ comes out to be negative.

Endothermic reactions are defined as the reactions in which energy of products is more than the energy of the reactants. In these reactions, energy is absorbed by the system.

The total enthalpy of the reaction $(\Delta H)$ comes out to be positive.

So, from the given option reaction which are exothermic are with negative value $(\Delta H)$ that enthalpy of reaction and those are:

1) $2Mg(s) + O_2( g )\rightarrow 2MgO (s)$ ,ΔH = -1203 kJ/mol

2) $NH_3 (g) + HCl (g)\rightarrow NH_4Cl (s)$ ,ΔH =-176 kJ/mol

3) $C(graphite) + O_2 (g)\rightarrow CO_2 (g)$ ,ΔH = -393.5 kJ/mol

4) $CH_4 (g) + 2O2 (g)\rightarrow CO_2 (g) + 2H_2O (l)$ ,ΔH =-891 kJ/mol

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4 years ago

What is acid, base, salt?​

What is acid, base, salt?