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3 years ago

What is chemical reaction!?

Chemistry

2 answers:

Butoxors [25]3 years ago

6 0

Answer:

A chemical reaction is a process that leads to the chemical transformation of one set of chemical substances to another.

Zinaida [17]3 years ago

3 0

Answer:

a process that involves rearrangement of the molecular or ionic structure of a substance, as distinct from a change in physical form or a nuclear reaction.

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The following procedure was used to determine the volume of a flask. The flask was weighed dry and then filled with water. If th

navik [9.2K]

Answer:

31.345 cm³

Explanation:

Given:

Mass of the empty flask, m = 56.12 g

Mass of the flask filled with water, M = 87.39 g

Density of the water, ρ = 0.9976 g/cm³

now,

the mass of water filled in the flask, Mw = M - m = 87.39 - 56.12 = 31.27 g

also,

Density = mass / volume

thus, for water

0.9976 = 31.27 / volume

volume of water = 31.345 cm³

hence, the volume of flask is the volume of water filled = 31.345 cm³

4 0

3 years ago

If 4.5 mol of C6H8O7 react, how many moles of CO2 and Na3C6H5O7 will be produced?

Salsk061 [2.6K]

Answer:

A. 13.5 moles of CO2

B. 4.5 moles of Na3C6H5O7

Explanation:

We'll begin by writing the balanced equation for the reaction. This is given below:

3NaHCO3(aq) + C6H8O7(aq) → 3CO2(g) + 3H2O(s) + Na3C6H5O7(aq)

A. Determination of the number of mole CO2 produced from the reaction. This is illustrated below:

From the balanced equation above,

1 mole of C6H8O7 reacted to produce 3 moles of CO2.

Therefore, 4.5 moles of C6H8O7 will react to produce = 4.5 x 3 = 13.5 moles of CO2.

From the above calculation, 13.5 moles of CO2 is produced

B. Determination of the number of mole of Na3C6H5O7 produced by the reaction. This is illustrated below:

From the balanced equation above,

1 mole of C6H8O7 produced 1 mole of Na3C6H5O7.

Therefore, 4.5 moles of C6H8O7 will also produce 4.5 moles of Na3C6H5O7.

Therefore, 4.5 moles of Na3C6H5O7 is produced from the reaction.

5 0

3 years ago

During vaporization, a substance changes from a liquid to a(n) blank. (fill in the blank)

Alexxandr [17]

Either a gas or a vapor

3 0

4 years ago

What experimental evidence led Rutherford to conclude the following: (a) The nucleus of the atom contains most of the atomic mas

____ [38]

Answer:

See Explanation

Explanation:

The experiment of Ernest Rutherford involved the bombardment of a thin gold foil with alpha particles from a radioactive source. A zinc sulphide screen was used to follow the movement of the alpha particles.

It was discovered that most of the alpha particles followed a straight path through the gold foil. Some of them were scattered through large angles and few were even scattered in the backward direction.

Since alpha particles were heavier than electrons, they must have been deflected by very strong forces.

These experimental evidences led to the conclusions stated in the question.

6 0

3 years ago

The equilibrium reaction below has the Kc = 0.254 at 25°C. If the temperature of the system at equilibrium is decreased to 0°C,

tia_tia [17]

Answer:

The equilibrium shifts towards reagents

Explanation:

Is known $Kc=\frac{[products]}{[reagents]}$ rised to the power of their number of moles in the balanced reaction. When you have a system at equilibrium with Kc < 1, it means [products] < [reagents] and the system needs energy to react, so if you decrease tempeture the equilibrium shifts towards reagents and less products will be created.

This efect can be discribed with Van´t Hoff equation: $ln(\frac{K1}{K2}) =-\frac{dH}{R} (\frac{1}{T1} -\frac{1}{T2} )$ where we can see that if we decrease temperature (this is T2<T1) in consecuense K2<K1 and reaction doesn´t happen.

7 0

3 years ago

What is chemical reaction!?​

What is chemical reaction!?