Answer:
A chemical change occurred, so even if Cash heats it, the white solid will remain.
Explanation:
- A physical change occurred, so if Cash heats it, the white solid will dissolve to form the original mixture of clear liquids.
- A physical change occurred, so even if Cash heats it, the white solid will remain.
- A chemical change occurred, so if Cash heats it, the white solid will dissolve to form the original mixture of clear liquids.
- A chemical change occurred, so even if Cash heats it, the white solid will remain.
<em>The correct answer would be that a chemical change occurred, so even if Cash heats it, the white solid will remain.</em>
Chemical changes occur when atoms in a substance or mixture of substances are rearranged, leading to the formation of new substances.
<u>In this case, the mixture of the two clear liquids led to the formation of gas in form of bubbles and a white solid forms that settle at the bottom. The formation of these 2 substances from the mixture of the two clear liquid is an indication of chemical reaction/changes. Hence, even if cash heats the resulting mixture, the white solids will likely remain.</u>
Answer: C.It provides an alternative energy pathway for the reaction to proceed.
Explanation:
Activation energy is the extra energy that must be supplied to reactants in order to cross the energy barrier and thus convert to products.
A catalyst is a substance which increases the rate of a reaction by taking the reaction through a different path which involves lower activation energy and thus more molecules can cross the energy barrier and more molecules convert to products.
Thus catalyst speeds up the reaction and does not increase the total amount of product formed.
The catalyst itself does not take part in the chemical reaction and is regenerated as such at the end.
Answer:
0.025 moles of NO₂ will produced
Explanation:
Given data:
Moles of NO₂ formed = ?
Volume of HNO₃ = 25.0 mL
Molarity of HNO₃ = 2 M
Solution:
Chemical equation:
Cu + 4HNO₃ → Cu(NO₃)₂ + 2NO₂ + 2H₂O
Number of moles of HNO₃:
Molarity = number of moles / volume in L
2M = number of moles / 0.025 L
Number of moles = 2 M × 0.025 L
Number of moles = 0.05 mol
Now we will compare the moles of HNO₃ with NO₂ from balance chemical equation.
HNO₃ : NO₂
4 : 2
0.05 : 2/4×0.05 =0.025
0.025 moles of NO₂ will produced.
Answer:
Explanation:
They are the molecules that are formed when four atoms chemically bond together.
