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inessss [21]
3 years ago
15

An atom with 32 protons and 28 neutrons is

Chemistry
1 answer:
Leno4ka [110]3 years ago
4 0
It's atom number is 32 and atomic mass number is 60
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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

6 0
4 years ago
What kind of intermolecular force is MgCl2 and why?
Viefleur [7K]

Answer:

(a) MgCl2 consists of Mg2+ and Cl- ions held together by ionic bonding forces;; PCl3 consists of polar molecules, so intermolecular dipole- dipole forces are present..

Explanation:

Well.. Hope it helps you..

Y-your welcome in advance..

(;ŏ﹏ŏ)(ㆁωㆁ)

5 0
3 years ago
The oxidation of alcohol gives what?
Kipish [7]

Answer:

primary alcohol form aldheydes and carboxylic acids and secondary alcohol forms ketones

6 0
3 years ago
To find the density of an object you would use a graduated cylinder to find what characteristic of the object?
ehidna [41]
The answer for this is B
3 0
3 years ago
When bases dissolve in water they release what type of negative ion?
Leto [7]
A base generally releases a hydroxide ion (OH-) when dissolved in water. 

There are exceptions, such as ammonia NH3, which acts as a base but does not produce OH- ions. There are three definitions of acids and bases (Arrhenius, Bronsted-Lowry, and Lewis) and each one looks at acid/base characteristics differently. OH- donation is the Arrhenius definition.
4 0
4 years ago
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