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4 years ago

Which of the following processes is spontaneous?

Chemistry

2 answers:

Vikki [24]4 years ago

8 0

C

It is the only answer that does not require outside energy.

Greeley [361]4 years ago

3 0

The correct answer for above statement is:

C). drops of dye dispersing in a clear solution

Explanation:

A spontaneous manner is the time-evolution of a system in which it liberates free energy and it influences to a lower, more thermodynamically steady energy state. The symbol convention for free energy follows the usual convention for thermodynamic measurements, in which a statement of free energy from the system compares to an adverse change in the free energy of the system and a positive change in the free power of the surroundings.

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Give two reasons why a luminous flame is not used for heating purposes. (2mks) a

Natali [406]

Answer:

The Two reasons are :-

1. Combustion efficiency

2. Standardization of test conditions as non-luminous flame.

Explanation:

A luminous flame isn't suitable for heating as it gives out soot (A black powdery or flaky substance consisting largely of amorphous carbon, produced by the incomplete burning of organic matter)

8 0

3 years ago

Gold has density of 19.3 g/cm3; how many grams of gold are in a 16.0 cm3 gold bar?

Andre45 [30]

To determine the mass of gold, we simply multiply the density and volume. Density is a value for mass, such as kg, divided by a value for volume, such as m3. Density is a physical property of a substance that represents the mass of that substance per unit volume. We do as follows:

mass = density x volume
mass = 19.3 g/cm^3 ( 16.0 cm^3 )
mass = 308.8 g

6 0

3 years ago

How do you convert 134kj to Calories?

Sonja [21]

1 kilo joule = 0.239006 calories
134 kilo joule = 134 x 0.239006
= 32.026804 calories

5 0

3 years ago

A substance that increases the rate of a chemical reaction is called a(n) _____. answer

rodikova [14]

Catalyst increases the rate of a chemical reaction

3 0

3 years ago

Read 2 more answers

Chloroform is a liquid once used for anesthetic. What is the volume of 5.0 g of chloroform? The density of chloroform 1.49 g/mL

mario62 [17]

Answer:

3.3557047 mL

Explanation:

The density can be found using the following formula:

$d=\frac{m}{v}$

Let's rearrange the formula to find the volume, $v$ .

$d*v=\frac{m}{v}*v$

$d*v=m$

$\frac{d*v}{d} =\frac{m}{d}$

$v=\frac{m}{d}$

The volume can be found by dividing the mass by the density. The mass of the chloroform is 5 grams and the density is 1.49 grams per milliliter. Therefore,

$m= 5g \\d= 1.49 g/mL$

Substitute the values into the formula.

$v=\frac{5g}{1.49 g/mL}$

Divide. When we divide, the grams, or g, in the numerator and denominator will cancel out.

$v= \frac{5}{1.49}mL$

$v=3.3557047 mL$

The volume of 5 grams of chloroform is 3.3557047 milliliters

4 0

3 years ago