All categories

3 years ago

A chemical change involves the formation or the breaking of bonds. true or false

Chemistry

2 answers:

dusya [7]3 years ago

5 0

The answer would be true.

aleksandrvk [35]3 years ago

4 0

Answer: The given statement is true.

Explanation:

A chemical change is a change that causes change in chemical composition of a substance.

This change is due to the exchange of electrons that lead to the formation or breaking of bonds.

For example, sodium atom on donating an electron to chlorine atom forms an ionic bond due to transfer of electron.

This formation of ionic bond leads to the formation of a new compound named as sodium chloride.

Therefore, we can conclude that the statement a chemical change involves the formation or the breaking of bonds, is true.

You might be interested in

An empty Erlenmeyer flask weighs 241.3 g. When filled with water (d = 1.00 g/cm³), the flask and its contents weigh 489.1 g. (a)

miskamm [114]

The answer is- Volume of flask = 247.8 $cm^3$ or 247.8 mL.

Density (d) is defined as mass of substance divided by its volume. Thus, if mass and density are known, then Volume can be determined.

What is the formula of volume in terms of density?

Let mass of substance be 'm' and volume be 'V'. Thus, as per the definition of density, it is expressed as-

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

Thus, volume can be expressed as-

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

Now, mass of empty flask = 241.3 g and the mass of (flask + Water) = 489.1 g.

Thus, mass of water = $489.1\ g- 241.3\ g = 247.8\ g$ .

Thus, mass of water = 247.8 g and density of water = $1.00\ g/cm^3$ . Its volume is calculated as-

$V = \frac{247.8\ g}{1.00\ g/cm^3}=247.8\ cm^3$

Hence, volume of flask = 247.8 $cm^3$ or 247.8 mL.

To learn more about Density and Volume, visit:

brainly.com/question/952755

#SPJ4

8 0

2 years ago

When H2(g) reacts with O2(g) to form H2O(g) , 242 kJ of energy are evolved for each mole of H2(g) that reacts. Write a balanced

algol [13]

Answer:

2H2(g) + O2(g) --------> 2H2O(g). ∆H= -242KJmol-1

Explanation:

A thermochemical equation is a balanced chemical reaction equation that includes the physical states of all reactants and products and the energy change.

As shown above, hydrogen reacted with oxygen in the gas phase to form water, an energy of 242KJ was evolved and we are required to put this in a thermochemical equation using the least coefficients.

Hydrogen reacts with oxygen to form water in the gas phase in a least ratio of 2:1 as shown in the answer.

The term 'energy evolved' in the question means that the reaction is exothermic and energy is evolved. Hence ∆H is negative as shown.

6 0

3 years ago

PLS HELPPP ASAP

Delvig [45]

The answer is beryllium

8 0

3 years ago

The burning of gasoline in an automobile engine is an example of a(n) _____.

inysia [295]

It is an exothermic reaction because the heat is released.