Hope it cleared your doubt :)
Choose the following statements that show evidence for a chemical reaction.
1 answer:
Explanation:
A chemical reaction is defined as the reaction in which bonds between the reactants either break or form which leads to the formation of a new substance.
For example,
So, when we drop a sodium metal into water then it produces a frizzing sound which shows the metal is reacting with water.
We know that when two aqueous solutions chemically react with each other then it may lead to the formation of an insoluble substance which is known as precipitate.
This means that formation of a precipitate is also a chemical reaction.
Thus, we can conclude that following are the statements which show evidence for a chemical reaction.
- Dropping sodium metal into water produces fizzing.
- Mixing two aqueous solutions produces a precipitate.
You might be interested in
Considering the definition of molar mass, the mass of 1.5 moles of CaCO₃ is 150 grams.
<h3>Definition of molar mass</h3>The molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.
The molar mass of a compound (also called Mass or Molecular Weight) is the sum of the molar mass of the elements that form it (whose value is found in the periodic table) multiplied by the number of times they appear in the compound.
<h3>Molar mass of CaCO₃</h3>In this case, you know the molar mass of the elements is:
- Ca= 40 g/mole
- C= 12 g/mole
- O= 16 g/mole
So, the molar mass of the compound CaCO₃ is calculated as:
CaCO₃= 40 g/mole + 12 g/mole + 3× 16 g/mole
Solving:
CaCO₃= 100 g/mole
<h3>Mass of 1.5 mol CaCO₃</h3>Next, you can apply the following rule of three: If by definition of molar mass 1 mole of the compound contains 100 grams, 1.5 moles of the compound contains how much mass?
<u><em>mass= 150 grams</em></u>
Finally, the mass of 1.5 moles of CaCO₃ is 150 grams.
Learn more about molar mass:
<u>brainly.com/question/5216907</u>
<u>brainly.com/question/11209783</u>
<u>brainly.com/question/7132033</u>
<u>brainly.com/question/17249726</u>
#SPJ1