CHEMISTRY COLLEGE

Which of the following best support the function of electrical signals in the nervous system?Each nerve cell is connected to the brain by electrical signals.
Nerve cells communicate with the brain by sending out electrical signals
Electrical signals keep nerve cells alive.
Electrical signals are used to get rid of waste produced in the nervous system.

Answers

Answer 1

Answer:

Answer:

Each nerve cell is connected to the brain by electrical signals

Explanation:

Answer 2

Answer:

Answer:

they said it above me

Explanation:

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Carbon and oxygen combine to form the molecular compound CO2, while silicon and oxygen combine to form a covalent network solid with the formula unit SiO2. Explain the difference in bonding between the two group 4A elements and oxygen. g
Classify each substance based on the intermolecular forces present in that substance.A. Hydrogen bonding, dipole dipole, and dispersionB. Dipole dipole and dispersion onlyC. Dispersion only 1. H2O 2. CH43. CO 4. CH2Cl

Construction crews sometimes use this reaction for welding underwater structures:Fe2O3 + 2Al → Al2O3 + 2Fe

How many moles of iron (Fe) would be produced if 2.50 mol Fe2O3 react? Make sure to use the correct number of significant figures in your answer.

2.50 mol Fe2O3 =

Answers

Answer:

5 moles of iron formed

Explanation:

Given data:

Moles of iron formed = ?

Moles of iron oxide react = 2.50 mol

Solution:

Chemical equation:

Fe₂O₃ + 2Al → Al₂O₃ + 2Fe

Now we will compare the moles of iron with iron oxide.

Fe₂O₃ : Fe

1 ; 2

2.50 : 2×2.50 = 5 mol

How many moles of oxygen are in 8.24 moles Mg(NO3)2

Answers

Answer:

49.4 mol Oxygen

Explanation:

Mg(NO3)2 ----- 6 O

1 mol 6 mol

8.24 mol x mol

x = 8.24*6/1 = 49.44 mol ≈ 49.4 mol Oxygen

Inside a calorimeter, two solutions are mixed and result in an endothermic reaction. Which of the following best illustrates how this reaction affects the water in the calorimeter? (2 points)Select one:
a. The reaction has no effect on the water. The kinetic energy of the water molecules remains the same.
b. The reaction causes the temperature of the water to increase. The kinetic energy of the water molecules increases.
c. The reaction causes the temperature of the water to decrease. The kinetic energy of the water molecules decreases.
d. The reaction causes the temperature of the water to decrease. Then, the water gains heat from the surroundings and the kinetic energy of the water molecules increases.

Answers

The correct option is C. A calorimeter is an isolated system. In isolated systems there is no exchange whatsoever with the surrounding. In an isolated system, an endothermic reaction results in a decrease in the temperature of the system. This is in contrast to the effect of an endothermic reaction in an open system. The heat of reaction remains a positive quantity.

When a polar bond is formed between 2 atoms which atom receives a partial positive charge

Answers

Answer:

The less electronegative atom

Explanation:

Water contains polar bonds. Water is made up of oxygen and hydrogen. Oxygen is more electronegative then hydrogen so it is partial negative (because electron spend more time around oxygen in the polar bond), whereas, hydrogen has a partial positive charge as it is less electronegative (electrons spend less time around hydrogen in this polar bond).

How many iron atoms are in 0.32 mol of Fe2031? 3.9x 1023 jron atoms O 3.9 iron atoms O 6.02 x 1023 iron atoms 1.9 x 1023 iron atoms O 11x 10-24 iron atoms

Answers

Answer: $3.9* 10^(23)$ iron atoms

Explanation:

According to avogadro's law, 1 mole of every substance weighs equal to the molecular mass and contains avogadro's number $6.023* 10^(23)$ of particles.

$1 molecule of [tex]Fe_2O_3$ contains= 2 atoms of iron

$1 mole of [tex]Fe_2O_3$ contains= $2* 6.023* 10^(23)=12.05* 10^(23)$ atoms of iron

thus 0.32 moles of $Fe_2O_3$ contains= $(12.05* 10^(23))/(1)* 0.32=3.9* 10^(23)$ atoms of iron

Thus the sample would have $3.9* 10^(23)$ iron atoms.

What is chemical energy? (2 points)a
Energy that is stored or released during a chemical reaction

b
Energy that is destroyed during a physical change

c
Energy that is released during a phase change

d
Energy that is created when a substance is being burned

Answers

Final answer:

Chemical energy is the energy that is stored or released during a chemical reaction. It exists within the chemical bonds of molecules and can be converted into other forms of energy.

Explanation:

Chemical energy refers to the energy that is stored or released during a chemical reaction. It is a form of potential energy that exists within the chemical bonds of molecules. When a chemical reaction takes place, these bonds are broken or formed, resulting in the release or absorption of energy.

For example, when a fuel such as gasoline is burned, the chemical energy stored in the hydrocarbon molecules is converted into heat and light energy. Similarly, during photosynthesis, plants convert sunlight into chemical energy in the form of glucose.

Learn more about chemical energy here:

brainly.com/question/35887816

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Explanation:

Chemical energy

Chemical energy is energy stored in the bonds of chemical compounds, like atoms and molecules. This energy is released when a chemical reaction takes place.

Usually, once chemical energy has been released from a substance, that substance is transformed into a completely new substance.

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Complete combustion of 4.20 g of a hydrocarbon produced 12.9 g of CO2 and 6.15 g of H2O. What is the empirical formula for the hydrocarbon?

What factors govern the position of an IR absorption peak? Select one or more correct answers.(A) strength of the bond(B) effect of a magnetic field on nucleus spin(C) masses of the atoms involved in the bond(D) the type of vibration being observed

Order the materials from causing the greatest refraction to causing the least refraction.A water, air, oilB air, water, oilC oil, water, airD none of the above