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Ymorist [56]
3 years ago
15

Joan wants to test if salt lowers the temperature at which water boils. In two or more complete sentences, describe the best way

for Joan to develop a hypothesis for this situation. Write your answer in the essay box below.
Chemistry
1 answer:
Alexeev081 [22]3 years ago
6 0
Put a thermometer in the water and wait until it boils. When it boils record the temperature and compare it to the normal water boiling point.
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A piece of copper metal is dipped into an aqueous solution of AgNO3. Which net ionic equation describes the reaction that occurs
Katyanochek1 [597]

Answer:

Cu(s)+2Ag^+(aq) \rightarrow 2Ag(s)+Cu^{2+}(aq)

Explanation:

When copper metal is dipped into an aqueous solution of AgNO_3, copper nitrate (Cu(NO_3)_2) is formed. This is type of displacement reaction because copper metal displaces silver from its salt. As only one ion is being displaced, therefore, it is a single displacement reaction.

Copper displaces silver as it is more reactive than silver. This can be confirmed by position of copper and silver in reactivity series. Elements above in the reactive series displaces elements present below from their salts.

The molecular equation is as follows:

Cu(s)+2AgNO_3(aq) \rightarrow 2Ag(s)+Cu(NO_3)_2(aq)

Now, write the ionic equation as follows:

Cu(s)+2Ag^+(aq)+2NO_3^-(aq) \rightarrow 2Ag(s)+Cu^{2+}(aq)+2(NO_3)(aq)

Cancel the common terms,

Cu(s)+2Ag^+(aq) \rightarrow 2Ag(s)+Cu^{2+}(aq)

8 0
3 years ago
Read 2 more answers
Mendel crossed tall pea plants with short pea plants. the offspring were all tall plants.
Archy [21]

Answer:

1. short allele

2.tall allele

7 0
3 years ago
WILL GIVE BRAINLIEST What effect would El Niño most likely have on organisms? CHOOSE ONLY ONE A) El Niño would cause the extinct
Harrizon [31]

Answer:

it would have caused organisms to move in search of food and better conditions.

4 0
4 years ago
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URGENT!!! How many molecules of water are produced when a molecule of C7H16 combusts
Arlecino [84]
I wish i knew im sorry
3 0
3 years ago
To determine the concentration of chloride ion (Cl-) in a 100 mL sample of ground water, a chemist adds a large enough volume of
Orlov [11]

Answer:

[Cl^-]=232.3\frac{mgCl^-}{L}

Explanation:

Hello,

In this case, we can represent the chemical reaction as:

Cl^-(aq)+AgNO_3(aq)\rightarrow AgCl(s)+NO_3^-(aq)

In such a way, since the mass of the obtained silver chloride is 93.9 mg, we can compute the chloride ions in the ground water by using the following stoichiometric procedure whereas the molar mass of chloride ions and silver chloride are 35.45 g/mol and 143.32 g/mol respectively:

m_{Cl^-}=93.3mgAgCl*\frac{1mmolAgCl}{143.32mgAgCl}*\frac{1mmolCl^-}{1mmolAgCl} *\frac{35.45mgCl^-}{1mmolCl^-} =23.23mgCl^-

Finally, for the given volume of water in liters (0.100L), we compute the required concentration:

[Cl^-]=\frac{23.2mgCl^-}{0.100L}\\

[Cl^-]=232.3\frac{mgCl^-}{L}

Best regards.

5 0
4 years ago
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