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3 years ago

Describe the importance of the nervous system:

2 answers:

7 0

The nervous system helps all parts of the body communicate with each other. It reacts to changes both on the outside and the inside of the body. It controls our brains, growth, and development etc.

elena-14-01-66 [18.8K]3 years ago

3 0

Answer:

So you can feel the things outside of your body

Explanation:

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What is the most important monosaccharide on Earth?

Nikolay [14]

Probably the most important monosaccharide on earth is Glucose. it is used in many bodily functions and it a key source of energy

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3 years ago

Sulfur has 16 electrons. When it combines with magnesium. It acquires A -2 charge. How many electrons does it have now?

Rainbow [258]

18 electrons. With a -2 charge, that means it gains two electrons.

8 0

2 years ago

Why boiling point is more when vanderwall force if more?

jek_recluse [69]

Answer:

It is the intermolecular forces acting between the molecules that cause attractions between them making them liquids or solids. The strength of Van der Waals forces depends primarily on the number of electrons in total in the molecule, so larger molecules will have higher boiling points.

Explanation:

6 0

2 years ago

Determine the amount of energy (heat) in joules required to raise the temperature of 20g of gold from 5°C to 37°C.

insens350 [35]

Answer:

The answer to your question is E = 83.2 J

Explanation:

Data

Element: Gold

Initial temperature = T1 = 5°C

Final temperature = T2 = 37°C

mass = 20 g

Specific heat = 130 J/kg°K

Process

1.- Convert temperature to kelvin

T1 = 273 + 5 = 278°K

T2 = 273 + 37 = 310°K

2.- Convert mass to kg

1000 g --------------- 1 kg

20 g --------------- x

x = (20 x 1)/1000

x = 0.02 kg

3.- Formula

E = mC(T2 -T1)

4.- Substitution

E = (0.02)(130)(310 - 278)

E = (0.02)(130)(32)

E = 83.2 J

3 0

3 years ago

Specific Heat Material Copper Aluminum Gold Pyrex Specific Heat (J/g °C) 0.385 0.902 0.129 0.75 Material Water Ice Olive Oil Air

zimovet [89]

Explanation:

It is known that the amount of heat necessary to raise the temperature of 1 gram of a substance by $1^{o}C$ is known as specific heat.

Since, q = $mC \Delta T$

So, larger is the specific heat of a substance less will be the change in its temperature.

Therefore, olive oil has less specific heat as compared to water. This means that olive oil would get hotter.

Similarly, the specific heat of gold is lesser than the given materials or metals. Hence, gold will requires less heat to rise its temperature.

As a result, water present in gold will heat readily.

As the relation between heat and specific heat is as follows.

q = $mC \Delta T$

Therefore, calculate the amount of heat required by the water as follows.

q = $mC \Delta T$

= $100 g \times 4.18 J/g^{o}C \times (100 - 20)^{o}C$

= 33440 J

or, = 33.44 kJ (as 1 kJ = 1000 J)

Thus, 33.44 kJ heat would it take to raise the temperature of 100.0 g of water from $20.0^{o}C$ to $100.0^{o}C$ .

3 0

3 years ago