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lorasvet [3.4K]
3 years ago
7

8th grade science

Chemistry
2 answers:
eimsori [14]3 years ago
7 0

Answer:

B

Explanation:

morpeh [17]3 years ago
4 0

Answer:

Copper and Iron

Explanation:

Metals, like copper and iron, are good conductors of heat; that is because  metals are bounded by a 'cloud' of free electrons and these electrons can carry easily kinetic energy through the metal

On the other hand, foam and wood are isolators, that is, they are bad conductors of heat.

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For the following reaction, 22.8 grams of diphosphorus pentoxide are allowed to react with 13.5 grams of water . diphosphorus pe
gavmur [86]

Answer:

m_{H_3PO_4}=31.5gH_3PO_4

Explanation:

Hello,

In this case, the undergoing chemical reaction is:

P_2O_5(s)+3H_2O(l)\rightarrow 2H_3PO_4(aq)

Thus, since the diphosphorus pentoxide to water molar ratio is 1:3 and we are given the mass of both of them, for the calculation of the maximum mass phosphoric acid that is yielded, one could first identify the limiting reactant, for which we compute the available moles of diphosphorus pentoxide (molar mass 142 g/mol):

n_{P_2O_5}=22.8gP_2O_5*\frac{1molP_2O_5}{142gP_2O_5}=0.161molP_2O_5

And the moles of diphosphorus pentoxide that are consumed by 13.5 g of water (molar mass 18 g/mol):

n_{P_2O_5}^{consumed}=13.5gH_2O*\frac{1molH_2O}{18gH_2O}*\frac{1molP_2O_5}{3molH_2O}  =0.25molP_2O_5

Hence, since less moles of diphosphorus pentoxide are available, we sum up it is the limiting reactant, therefore, the maximum mass of phosphoric acid (molar mass 98 g/mol) is computed by considering the 1:2 molar ratio between them as follows:

m_{H_3PO_4}=0.161molP_2O_5*\frac{2molH_3PO_4}{1molP_2O_5} *\frac{98gH_3PO_4}{1molH_3PO_4} \\\\m_{H_3PO_4}=31.5gH_3PO_4

Regards.

8 0
2 years ago
Identify the anode and cathode please
Nuetrik [128]

Answer:

anode is negative. cathode is positive.

6 0
2 years ago
The basic repeating structural unit of a crystalline solid is called a _____. cell unit base unit unit cell lattice
aliina [53]
Unit Cell is the basic <span>repeating structural unit of a crystalline solid .</span>
8 0
2 years ago
Anna notices that different types of clothing stick together when they are dried in an electric dryer. When the clothes are pull
horrorfan [7]

Answer:

Dry more clothes at the same time so that there is less room for electric forces.

Explanation:

6 0
2 years ago
Read 2 more answers
which of the following substances is least able to cross the blood-brain barrier.)a. waterb. sodium ionsc glucosed. white blood
ivolga24 [154]

Answer:

d. white blood cells

Explanation:

It is the white blood cells that have the least tendency to cross the blood- brain barrier.

Blood- brain barrier is psychological barrier and restricts substances that circulate into the blood from crossing over the central nervous system.

Water, glucose as well as sodium ions can easily cross the barrier. As these are good for body supply energy to the brain.

8 0
3 years ago
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