Need the ionic formula

Answer:

4x+8x=30

12x=300

x=300/12

x=25

Answer:

It is the number one source of oxygen in the atmosphere. It contributes to the carbon cycle between the earth, the oceans, plants and animals. It contributes to the symbiotic relationship between plants, humans and animals. It directly or indirectly affects most life on Earth

Answer:

three importance are

it helps in fixing and balancing the amount of carbon dioxide and oxygen in the atmosphere

it provides the nutrition to the plant

it helps the. plant in its growth

Answer:

C) [He]

Explanation:

Answer:

B) Ne

Explanation:

took the test

Answer:

Surely you must have a Periodic Table beside you....?

a=38

Explanation:

You gots Z=18, the atomic number, where Z is the number of nuclear protons. The number of protons defines the element....and thus we got calcium....

....and with 20 neutrons we got the 38Ca isotope....the which is rather short-lived...

Answer:

lost 2 electrons

Explanation:

A cation by definition is a positively charged ion. They are formed when a metal loses its electrons. A cation has more protons than electrons, giving it a net positive charge. So, it had to have lost 2 electrons to give it a positive charge of 2⁺.

Answer:A

Explanation:

Answer:

A.160mgs

Explanation:

First you convert the lbs to kgs, 141lbs=63.957kgs

then you divide 63.957kgs by 2.5 which is 159.89

round up to 160, 160mgs is the correct dosage.

The dose that will the nurse administers for a 141 lb patient is 160mgs. The correct option is A.

A virus is an entity that is only become alive when it gets a living host. It takes survives in its host and affects the body of the host. They are microorganisms that can not be seen by direct eyes. Viruses are harmful microorganisms. They are very deadly and they transmit through breath.

Medication, contain treatment that includes drugs and therapies to recover the patient from the disease.  It is a proper process that includes timely procedures.

First, you convert the lbs to kgs, 141lbs = 63.957kgs

Then you divide 63.957 kgs by 2.5 which is 159.89 round up to 160, 160mgs is the correct dosage.

Thus, the correct option is A. 160 mg.

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Answer:

B. 214.02

Explanation:

1 mol of water weighs 18.015 gm and contains 6.023 × 10²³ molecules

From question, We have 7.15 × 10²⁴ molecules

Dividing we get (7.15 × 10 ²⁴) ÷ ( 6.023 × 10²³) = 11.871 molecules

Now, Weight of water = 11.871 × 18.015 = 213.85 which is nearer to option B

Answer:

[tex]\boxed {\boxed {\sf B. \ 214 \ g }}[/tex]

Explanation:

We are asked to find the mass of a given number of water (H₂O) molecules.

First, we convert molecules to moles. We will use Avogadro's Number or 6.022 × 10²³. This is the number of particles (atoms, molecules, formula units, etc.) in 1 mole of a substance. In this case, the particles are molecules of water. Therefore, there are 6.022 ×10²³ molecules of water in 1 mole of water.

We will convert using dimensional analysis, so we must set up a ratio using the underlined information.

[tex]\frac {6.022 \times 10^{23} \ molecules \ H_2O}{1 \ mol \ H_2O}[/tex]

We are converting 7.15 × 10²⁴ molecules of water to moles, so we multiply the ratio by that value.

[tex]7.15 \times 10^{24} \ molecules \ H_2O*\frac {6.022 \times 10^{23} \ molecules \ H_2O}{1 \ mol \ H_2O}[/tex]

Flip the ratio so the units of molecules of water cancel each other out.

[tex]7.15 \times 10^{24} \ molecules \ H_2O*\frac {1 \ mol \ H_2O} {6.022 \times 10^{23} \ molecules \ H_2O}[/tex]

[tex]7.15 \times 10^{24} *\frac {1 \ mol \ H_2O} {6.022 \times 10^{23} }[/tex]

[tex]\frac {7.15 \times 10^{24}} {6.022 \times 10^{23} } \ mol \ H_2O[/tex]

[tex]11.87313185\ mol \ H_2O[/tex]

Next, we convert moles to grams. We will use the molar mass. This is the mass of 1 mole of a substance. These values are found on the Periodic Table. They are equivalent to the atomic masses, but the units are grams per mole instead of atomic mass units.

Look up the molar masses of the individual elements in water: hydrogen and oxygen.

There is a subscript of 2 after H, so there 2 moles of hydrogen in 1 mole of water. Multiply the molar mass by 2 before adding oxygen's molar mass.

We convert using dimensional analysis again and set up another ratio.

[tex]\frac {18.015 \ g \ H_2O}{ 1 \ mol \ H_2O}[/tex]

Multiply by the number of moles we just calculated.

[tex]11.87313185 \ mol \ H_2O *\frac {18.015 \ g \ H_2O}{ 1 \ mol \ H_2O}[/tex]

The units of moles of water cancel.

[tex]11.87313185 *\frac {18.015 \ g \ H_2O}{ 1 }[/tex]

[tex]213.8944703 \ g \ H_2O[/tex]

The original measurement of molecules has 3 significant figures, so our answer must have the same. For the number we found, that is the one place. The 8 in the tenths place tells us to round the 3 up to a 4.

[tex]214 \ g \ H_2O[/tex]

There are approximately 214 grams of water and choice B is correct.

The acceleration of the hamster is 5 m/s².

Acceleration is the rate of change of velocity per unit of time.

Given:

We can calculate the acceleration of the hamster using the following expression:

[tex]a = \frac{v-v_0}{t} =\frac{10m/s-0m/s}{2s} = 5 m/s^{2}[/tex]

The acceleration of the hamster is 5 m/s².

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Answer:

HOPE THIS ANSWER WILL HELP YOU

Answer:

Hi Lovelys!!

Answers down below!!

Explanation:

There are two answer my me: Matter and Volume

Matter is anything that has mass and takes up space. Mass gives an object the property of weight and inertia (resistance to change in the motion of an object).

Volume simply refers to the space an object takes up. Depending on the physical state of an object, there are a couple ways to measure volume. If we are trying to measure the volume of a box, for instance, we would multiply the length of the box by its height and by its width.

Hope this helps!! =3

Have a wonderful day, evening, or night!! <3

Answer:

an element

Explanation:

that is the answer yep

it represent an element

Answer:

Jupiter.

Explanation:

Jupiter has the fastest axial rotation time (day) in the list of answers, based on the fact that its day is only 10 hours long.

A nuclear scientist because they are more focused on extracting the nuclear energy of atoms.

The evidence that might be used to conclude that I have isolated a new element is the number of protons in the nucleus.

Chemical elements are different materials that have been found in nature that are characterized by having chemical characteristics different from other elements.

One way to know if I have found and isolated a new element is by showing that it does not have the same number of protons in the nucleus because this is what defines the characteristics of each element and each one has a different number of protons in the nucleus.

Therefore, the first thing I must do when I think I have found a new element is to isolate one of its atoms and check that it does not have the same number of protons in the nucleus as another element.

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Answer:

A. The relationship between the Sun,Moon,and Earth

Explanation:

Explanation:

A displacement reaction is the one wherein the atom or a set of atoms is displaced by another atom in a molecule. For instance, when iron is added to a copper sulphate solution, it displaces the copper metal. A + B-C → A-C + B.

Answer:

MedlinePlus Drugs Information

Explanation:

Promethazine is in a class of medication called phenothiazines

Explanation:

The things that are changing in an experiment called variables. A variables is any factor , trail , or condition that can exist in differing amounts or types. The independent variables is the one that is changed by the scientist. Why just one? well, if you changed more than one variables it would be hard to fight out which be hard to fight out which change is causing what you observe . For example, what if our scientists question was:" how does the size of a dag affect how much ismts eats?" then, during your feeding experiment you changed both the size of the dog and the time of day the dags were fed.

Answer:

Each of these organelles performs a specific function critical to the cell's survival. For example, biochemical reactions in a cell's mitochondria transfer energy from fatty acids and pyruvate molecules into an energy-rich molecule called adenosine triphosphate (ATP).

Explanation:

Answer:

d

Explanation:

it just makes alot of sense and you got this

Oxygen is a gas that belongs to the chalcogen family and is a reactive non-metal. It is an element, molecule, or pure substance. Thus, option A is correct.

A pure substance is defined as a substance that cannot be physically separated into its constituent particles. They are known to have a definite and constant chemical composition. It can be a molecule, element, or compound.

An element is atomic species that cannot be broken into simple sub-particles by chemical processes. On the other hand, if an atomic element bonds to the same or different atom it forms a molecule.

Oxygen gas is an element composed of two atoms of oxygen and is a molecule as the two atoms are linked chemically. It is also a pure substance as it contains the same element.

Therefore, option A. oxygen gas is a pure substance, an element, and a molecule.

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Explanation:

Coal is formed when dead plantand animals matter decays into peat and is converted into coal by the heat and pressure of deep burial over millions of years.

Answer:

no

Explanation:

make use of this formula to find the mass of each sample.

m=density*volume

Answer:

Since KCl is an ionic compound, there is transfer of electrons from K to Cl. Thus right answer should be (B)

KCl is a chemical called potassium chloride that has been known to be an ionic compound. The valence electrons ion KCl gets transferred from K to Cl ion. Thus, option B is correct.

An ionic bond is said to be a type of chemical bond that involves the gain and loss of the electron in the valence shell of the atom species. It involves the bond formation between the ions.

The ions with opposite charges, carrying a positive and negative are said to bond by accepting and donating their electrons to achieve the noble-gas (electronic) configuration.

In KCl, potassium has more electrons and can donate it to chlorine species as the latter lacks electrons. Chlorine accepts electrons and in the process acquires a negative charge, whereas potassium gains a positive charge.

Therefore, option B. the KCl involves ionic bonds by transferring electrons.

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Answer:

solubility- the degree to which a material will dissolve in another substance

mixture- different materials placed together but keeping their own properties

solution- a mixture in which substances are spread out evenly and will not settle