All categories

2 years ago

Who no this i need help i need to pass to the next grade

Chemistry

1 answer:

Hitman42 [59]2 years ago

7 0

Exothermic reactions is where energy is released. Exothermic reactions are reactions that release energy into the environment in the form of heat. Exothermic reactions feel warm or hot or may even be explosive.

You might be interested in

-brass

prohojiy [21]

Answer:

A= carbon

B= iron

C= Brass

D= water

E= soil?

F= magnesium oxide

G= Steel

H=wine

7 0

2 years ago

R-CH2-COOH in presence of X2 / red P and H2O gives ________ Name the reaction

Ksenya-84 [330]

[tex]\huge{\textbf{\textsf{{\color{pink}{An}}{\red{sw}}{\orange{er}} {\color{yellow}{:}}}}}[/tex ]

8 0

2 years ago

What is the mass of 8.90 moles of magnesium chloride, MgCl2?

Korolek [52]

No of moles of MgCl2 = weight of MgCl2 / Molecular weight of MgCl2 Weight of MgCl2 =moles of MgCl2 x molecular mass of MgCl2 = 8.90 x 95=845.5 gm

6 0

2 years ago

In the reaction H2CO3 (aq) + 2NH3 (aq) = 2NH4^+ (aq) + CO3 2- (aq), how many electrons are transferred?

aalyn [17]

The electrons are transferred when the reaction is redox reaction. It means that there must be reduction and oxidation.

The given equation is

$H_{2}CO_{3} (aq)+2NH_{3} (aq)=2NH_{4}^{+}(aq)+CO_{3}^{-2}(aq)$

The oxidation number of each element remains the same before and after the reaction.

H = +1

C: +4

O: -2

N: -3

Thus this is simple acid base reaction and not redox

There is transfer of proton from bicarbonate to ammonia

this is not a redox reaction

3 0

2 years ago

A mixture containing 21.4 g of ice (at exactly 0.00 ∘C) and 75.3 g of water (at 80.2 ∘C) is placed in an insulated container.

tatuchka [14]

Heat gained in a system can be calculated by multiplying the given mass to the specific heat capacity of the substance and the temperature difference. In a mixture it should be that heat gained is equal to the heat removed. We calculate as follows

Q1 = -Q2

21.4(T2-0.00) = -75.3(T2 - 80.2)
T2 = 62.45

4 0

2 years ago