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3 years ago

Explain why the nucleus of an atom has a positive electrical charge.

Chemistry

1 answer:

xxTIMURxx [149]3 years ago

6 0

Answer: Nucleus of an atom is heavy and positively charged because nucleus is only made up of protons and neutrons.

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Which two statements describe how igneous rock is formed?

Anon25 [30]

Answer:

B and C

Explanation:

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8 0

2 years ago

A sample of 450.0 g of water is found to contain 180 mg Cd. What is this concentration in parts per million?

navik [9.2K]

Answer:

The correct answer is 399.8 ppm

Explanation:

A concentration in parts per million (ppm) is equal to:

$1 ppm = \frac{1 g solute}{10^{6}g solution}= \frac{1 mg solute}{1 kg solution}$

Solute: Cd; Mass = 180 mg x (1 g/1000 mg) = 0.18 g

Solvent: Water ; Mass= 450.0 g x (1 kg/1000 g) = 0.45 kg

We have the following total mass of solution:

Mass of solution = Mass of solute + Mass of solvent = 0.18 g + 450 g = 450.18 g = 0.45018 kg

Finally, we divide the mass of solute (in mg) into the mass of solution (in kg) to obtain the ppm (in mg/Kg):

ppm = 180 mg/0.45018 kg = 399.8 mg/Kg = 399.8 ppm

4 0

3 years ago

Which of the following statements is true?

lys-0071 [83]

Answer:

Air is a good insulator because the molecules are far apart. This reduces mobility of air molecules hence conduction is difficult.

Explanation:

For other statements :

All the suns radiations are not reflected back to space because the ozone layer of the earth's atmosphere which regulates the intensity of radiations from the sun, it is transparent and porous hence heat and light rays from sun enter earth.
Work is only done by potential energy when the body is under free fall and experiencing gravitational force, but for a body moving without influence of gravity, work is done by the force applied and the distance moved by the body. This force is called a conservative force.
Total mechanical energy is given by

= Kinetic energy + Potential energy

8 0

3 years ago

The air is less dense at higher altitudes. How does this affect climate? The climate tends to be warmer due to the intensity of

MrMuchimi

Answer: [deleted answer due to being incorrect]

8 0

3 years ago

Please answer step by step.

Digiron [165]

3 moles of NaOH reacts with 1 mole of phosphoric acid.

<h3>What is the moles ratio of the NaOH and Phosphoric acid reaction?</h3>

The moles ratio of the reaction between NaOH and Phosphoric acid is given by the equation of the reaction below:

$3\:NaOH + H_{3}PO_{4} \rightarrow Na_{3}PO_{4} + 3\:H_{2}O \\$

Based on the equation of the reaction, 3 moles of NaOH reacts with 1 mole of phosphoric acid.

Learn more about mole ratio at: brainly.com/question/19099163

#SPJ1

3 0

2 years ago