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3 years ago

Name two reactions which are endothermic in nature..

Chemistry

2 answers:

Snezhnost [94]3 years ago

7 0

Melting ice cubes. Melting solid salts. Evaporating liquid water

DerKrebs [107]3 years ago

4 0

Answer:

ham nahi jante hai be happy

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Why factory waste should be neutralized before disposing it into the water bodies?

Fudgin [204]

Explanation:

Factory wastes are usually acidic and they pose serious environmental challenges.

If an untreated acidic waste is discharged into the river, the acidity of the river increases and this is toxic to life in the water.

On land, the acid can enter into the soil and prevent plant growth.

Acid discharge can enter the groundwater system and render it unfit for use.

Bases and a couple of additives are used to remove acidity from factory wastes before they are discharged.

Learn more:

Neutralization brainly.com/question/4455839

#learnwithBrainly

6 0

3 years ago

What is the pOH of 0.50 molar H3BO3?

Crazy boy [7]

Answer:

A. 10.25

Explanation:

Pkb =4.77

So pka = 14 - pka = 9.23

$Ka =10^{-pka}$

$H_3 BO_3 (aq)+ H_2 O(l) H_2 BO_3^- (aq)+H_3 O^+ (aq)$

Initial 0.50M 0 0

Change -x +x +x

Equilibrium 0.50M-x +x +x

$Ka =\frac {((x)(x))}{(0.50M-x)}$

$5.88\times10^{-10}= \frac {x^2}{(0.50M-x)}$

(-x is neglected) so we get

$5.88\times10^{-10}\times0.50=x^2\\\\x^2=2.94\times10^{-10}$

$x=\sqrt{x^2}=1.72\times10^{-5} M=H^3 O^{+}$

$pH=-log[H^3 O^+]\\\\pH=-log[1.72\times10^{-5}]\\\\pH=4.76$

pOH = 14 - pH

= 14 - 4.76

pOH = 9.24 is the answer

Option A - 10.25 is the answer which is close to 9.24

4 0

3 years ago

Carbon dioxide is returned to the atmosphere primarily by the

Mandarinka [93]

Answer:c or d

Explanation:

4 0

3 years ago

Read 2 more answers

If you wanted to make 0.800 Liters of a 0.531 M solution of Nickel(II) chloride, NiCl2, how many grams of NiCIZ

kotegsom [21]

Answer:

54.8g

Explanation:

1. Calculate the number of moles of NiCl₂

a) Identify the known variables

V =0.800 liters
M = 0.531M
n = ?

b) Formula

$M=\dfrac{n}{V}$

c) Clear n

$n=M\times V$

g) Substitute and compute

$n=0.531M/times 0.800liters=0.4248mol$

2. Convert moles to grams

a) molar mass of NiCl₂

129g/mol (shown in the problem)

b) Unit canceling method

Use the factors in order to cancel the units to obtain grams

$0.4248mol\times 129\dfrac{g}{mol}=54.7992g$

Note that the mol unit appears on the numerator and denominator, so it cancels leaving just g (grams).

c) Round to 3 signficant figures

$54.8g$

6 0

4 years ago

A rectangular block of copper metal weighs 1896 g. The dimensions of the block are 8.4 cm by 5.5 cm by 4.6 cm. From this data, w

Fed [463]

Answer:

Density = 8.92 g/cm³

Explanation:

Density shows the relation of the mass and volume of a determined object. We have this deffinition:

Density = mass / volume

First of all, we calcualte the volume of the block of copper metal, with the data given:

8.4 cm . 5.5 cm . 4.6 cm = 212.52 cm³

Now we replace at the density formula:

Density = 1896 g /212.52 cm³ = 8.92 g/cm³

7 0

3 years ago

Name two reactions which are endothermic in nature..​

Name two reactions which are endothermic in nature..