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romanna [79]
3 years ago
5

Which of the following objects would transfer heat by convection?

Chemistry
2 answers:
Shkiper50 [21]3 years ago
7 0

<em>i think the answer is b </em>

sammy [17]3 years ago
7 0

Answer:

Metal Spoon

Explanation:

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Determine the concentration of a solution made by dissolving 1.40grams NaCL in enough water to make 30.0mL of solution.
KiRa [710]

Answer: 0.8M

Explanation:

Given that,

Amount of moles of NaCl (n) = ?

Mass of NaCl in grams = 1.40 g

For molar mass of NaCl, use the molar masses:

Sodium, Na = 23g;

Chlorine, Cl = 35.5g

NaCl = (23g + 35.5g)

= 58.5g/mol

Since, amount of moles = mass in grams / molar mass

n = 1.40g / 58.5g/mol

n = 0.024 mole

Now, given that:

Amount of moles of NaCl (n) = 0.024

Volume of NaCl solution (v) = 30.0mL

[Convert 30.0mL to liters

If 1000 mL = 1L

30.0mL = 30.0/1000 = 0.03L]

Concentration of NaCl solution (c) = ?

Since concentration (c) is obtained by dividing the amount of solute dissolved by the volume of solvent, hence

c = n / v

c = 0.024 mole / 0.03 L

c = 0.8 M (0.8M means concentration is in moles per litres)

Thus, the concentration of the solution is 0.8M

3 0
3 years ago
Is this a model of an element, a compound, or a mixture? Explain your reasoning.
grandymaker [24]

Answer:

A mixture

Explanation:

Yes

6 0
3 years ago
What is the limiting reactant when 8.4 moles of lithium react with 4.6 moles of oxygen gas?
serious [3.7K]

Answer: Lithium

Explanation: The balanced chemical equation is:

4Li+O_2\rightarrow 2Li_2O

It can be seen, 4 moles of lithium combines with 1 mole of oxygen gas to produce 2 moles of lithium oxide.

Thus 8.4 moles of lithium combines with=\frac{1}{4}\times {8.4}=2.1molesof oxygen gas to produce 4.2 moles of lithium oxide.

As, Lithium limits the formation of product, it is the limiting reagent and Oxygen gas is present in excess, it is called the excess reagent. (4.6-2.1)=2.5 moles of oxygen gas are present in excess.

5 0
3 years ago
Read 2 more answers
An industrial chemist is studying a sample of an unknown metal. Describe two ways he could change the metal physically and two w
Illusion [34]

Answer:idk what they cpuld do but we can say this is the right answer :))))

Explanation:

I need PoInTs

5 0
3 years ago
I'm strong and stiff
Andreas93 [3]

Answer:

Sap?

Explanation:

6 0
2 years ago
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