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german
3 years ago
7

During a lab activity, students prepared two solutions separately at the same temperature. Later they mixed the solutions and th

e temperature dropped. Why?
Chemistry
1 answer:
tino4ka555 [31]3 years ago
7 0
This at be due to a chemical change. For example, when some chemical elements mix, the change causes heat. This is the same, but the opposite. Hope this helps!
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3 years ago
Which of the following will occur when a solution of Pb(NO3)2(aq) is mixed with a solution of KI(aq)?
inna [77]

When a solution of Pb(NO3)2(aq) is mixed with a solution of KI(aq), a precipitate of PbI₂ will form; K⁺ and NO₃⁻ are spectator ions.

<u>Explanation:</u>

When an aqueous solution of lead nitrate (Pb(NO₃)₂ is mixed with aqueous solution of potassium iodide (KI), then there is a precipitate formation of lead iodide (PbI₂), and the potassium  (K⁺) ion and nitrate (NO₃⁻) ion acts as spectator ions that is ions do not involved in the reaction.

The reaction can be represented as,

Pb(NO₃)₂(aq) + 2 KI (aq) → PbI₂(s) + 2KNO₃(aq)

The ionic equation can be written as,

Pb²⁺(aq) + 2 NO₃⁻(aq) + 2 K⁺(aq) + 2 I⁻(aq) →  PbI₂(s) + 2K⁺(aq) + 2NO₃⁻(aq)

On both sides of the equation, we have K⁺ and NO₃⁻ ions, which gets cancelled, and these 2 ions are called as spectator ions.

3 0
3 years ago
How do signals move through the nervous system?
pashok25 [27]

Answer:

Nervous system messages travel through neurons as electrical signals. When these signals reach the end of a neuron, they stimulate the release of chemicals called neurotransmitters. Neurotransmitters travel across synapses, spaces between neurons or between neurons and other body tissues and cells.

Explanation:

3 0
3 years ago
If a pH of water is 5.3 then 4.3 is it 1.0 less acidic 1.0 less basic
Gnom [1K]
The pH of water is 7
5.3 to 4.3 is more acidic. 1 pH is more acidic than 2 pH The base starts at 8.
4 0
3 years ago
Read 2 more answers
Which of the following is NOT a variable property for a gas?
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Volume, does air take up space? If it does then yep. Balloon example/
Density, yes it does, because it's tightly wounded up.

D
5 0
3 years ago
Read 2 more answers
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