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3 years ago

4 description of meteor showers

Chemistry

1 answer:

mel-nik [20]3 years ago

5 0

Answer:

A meteor shower are defined as the celestial event in which a meteor comes from one point in the sky and visible in night sky.

Meteors are also known as Shooting stars as they glow when enters in the Earth surface as glowing streaks, where tail point to the origin in the sky and face faces the Earth surface.

Meteor showers take place when meteoroids entering Earth's atmosphere.

Meteor showers can repeat themselves because it depends on the comet orbits which can take place at the same time each year.

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Place the steps of the action potential in order.

Ierofanga [76]

Answer:

-Reversal of the resting potential due to influx of sodium ions

-Mechanism that restores the resting membrane voltage and intracellular ionic concentrations

-Period during which potassium ions are diffusing out of the neuron because of a change in membrane permeability

-A brief reversal of membrane potential that travels along the axon

Explanation:

An action potential is a situation where the membrane potential is briefly reversed from -70mV to +30 mV

There are three steps of the moving action potential, including;

1) The depolarization step, where the membrane resting potential is reversed by the rush of sodium ions into a neuron

2) The repolarization, due to the closing of the voltage-gated sodium channels and the opening of the potassium channels, which is a mechanism that restores the membrane's resting voltage and the ionic concentration in the cell

3) Hyperpolarization, where due to some open potassium channels, there is an increased potassium permeability, and excessive efflux of potassium ions take place, which results in a dip in the membrane potential

4) The above three phases describe the phase of the action potential which is the brief reversal of membrane potential that travels along the axon

7 0

3 years ago

The dosage for an antibiotic is prescribed at 8.0 mg per kilogram of body weight taken it twice daily for 2 weeks what total mas

krek1111 [17]

Answer:

18.2784 g

Explanation:

First we convert 180 lb to kg:

1 lb = 0.453 kg

180 lb * 0.453 kg / lb = 81.6 kg

Now we calculate the mass of antibiotic taken in one day:

8.0 mg/kg * 81.6 kg = 652.8 mg

Given that it is taken twice daily, in one day the person would take (652.8 * 2) 1305.6 mg. In grams that mass would be:

1305.6 mg / 1000 = 1.3056 g

Finally we multiply those 1.3056 daily grams by the 14 days in two weeks:

(1.3056 g) * 14 = 18.2784 g

7 0

3 years ago

In the environment, arsenic is found in inorganic and organic forms and in different valence or oxidation states based on geolog

Alinara [238K]

Answer:

True

Explanation:

Arsenic is an element that has similar behavior to metal, it is toxic to humans. It can be produced by some human activities but it is also available in nature in its organic or inorganic form, this last one being more toxic.

Organic arsenic can be found especially in sea-living organisms.

Inorganic arsenic can be found in the earth's crust and it can affect the acidity levels (PH) of the soil.

7 0

3 years ago

Hydrogen chloride gas and oxygen react to form water vapor and chlorine gas. What volume of water would be produced by this reac

AlladinOne [14]

Answer: 3.4 L

Explanation:

To calculate the moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given Volume}}{\text {Molar Volume}}=\frac{6.5L}{22.4L}=0.29moles$

The balanced chemical equation for reaction of Hydrogen chloride gas with oxygen to form water vapor and chlorine gas.

$4HCl(g)+O_2(g)\rightarrow 2H_2O(g)+2Cl_2(g)$

According to stoichiometry :

4 moles of $HCl$ produce = 2 moles of $H_2O$

Thus 0.29 moles of $HCl$ will produce = $\frac{2}{4}\times 0.29=0.15moles$ of $H_2O$

Volume of $H_2O=moles\times {\text {Molar Volume}}=0.15moles\times 22.4L/mol=3.4L$

Thus 3.4 L of of water would be produced by this reaction if 6.5 L of hydrogen chloride were consumed

4 0

3 years ago

Describe the structure and bonding in sodium chloride

klio [65]

Sodium chloride is made up of sodium and chlorine.
sodium chlorine would form an ionic bond, which is the transfer of electrons

because sodium is in group 1, it has 1 electron on its outermost shell
because chlorine is in group 7, it has 7 electrons on the outermost shell.

sodium and chlorine both want a full outer shell. therefore, sodium and chlorine will form an ionic bond, and sodium will transfer its one electron to chlorine so that it can lose its electron and get a full outer shell, and chlorine can gain an electron and also get a full outer shell. this can be represented using the dot and cross model. as shown in the picture.
but don't forget to add a 1- charge to chlorine with brackets and a 1+ charge to sodium, also with brackets.

hope this helped.. I know it became really long but I didn't really realise it once I was half way.. anyway, if you have any questions just ask :)

8 0

4 years ago

4 description of meteor showers​

4 description of meteor showers