Which of the following best describes the bonding found within Al2O3?

Answer:

Explanation:

Mole measure the number of elementary entities of a given substance that are present in a given sample. 1 mole of ZnI[tex]_2[/tex] will result by the reaction of 1 mole of Zn with 1 mole of I[tex]_2[/tex].

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number. The stoichiometry represents the number of moles.

The balanced equation is

[tex]Zn+ I_2\rightarrow ZnI2[/tex]

To see the mole of zinc iodide we need to have the knowledge of stoichiometry chemistry. So, the mole ratio among Zn, I[tex]_2[/tex] and [tex]ZnI_2[/tex] are 1:1:1 that means to produce 1 mole of ZnI[tex]_2[/tex], one of each Zn and I[tex]_2[/tex] are required.

Therefore 1 mole of ZnI[tex]_2[/tex] will result by the reaction of 1 mole of Zn with 1 mole of I[tex]_2[/tex].

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Answer:

D. Element.

Explanation:

Atoms form elements. Elements form molecules. Molecules form compounds.

Answer:

1.2353 mol

Explanation:

Answer:

180 mmHg

Explanation:

Total volume of gases = 20% + 80%= 100%

Total pressure of gases = 900 mm Hg

Note that partial pressure of a gas = mole fraction × total pressure

Mole fraction of oxygen = 20/100

Hence partial pressure of oxygen= 20/100 × 900 mm Hg

partial pressure of oxygen= 180 mmHg

Answer:

6.2 days

Explanation:

initial activity = 40,000 cpm

one half-life = 20,000 cpm

two half-lives = 10,000 cpm

three half-lives= 5,000 cpm

four half-lives = 2500 cpm

24.8 days/4 half-lives = 6.2 days/ half-life

Explanation:

The ozone layer is a natural layer of gas in the upper atmosphere that protects humans and other living things from harmful ultraviolet (UV) radiation from the sun. ... The ozone layer filters out most of the sun's harmful UV radiation and is therefore crucial to life on Earth.

Answer:

Indirect (B)

Explanation:

When one facter increases the other decreases.

Answer:

INDIRECT- when one factor increases, the other decreases

Answer:

This is an abbreviation for "parts per million" and it also can be expressed as milligrams per liter (mg/L). This measurement is the mass of a chemical or contaminate per unit volume of water. Seeing ppm or mg/L on a lab report means the same thing.

Answer:

Because of the tilt of Earth on its axis, Earth's surface and atmosphere are unevenly heated by the Sun. Convection currents form in the atmosphere as warmer air rises and cooler air sinks.

Uneven hearing of earth cause convention currents to form because the Earth's surface and atmosphere are unevenly heated by the Sun

Answer:

Explanation:

Let us look closely at the compound, Count the number atoms in the following compound Al(OH)3;

We shall considered the number of each atom present in this compound.

There is one atom of aluminum present

There are three atoms of oxygen present

There are three atoms of hydrogen present

Hence, there are a total of seven atoms of different elements in the compound.

Answer:

D. The potential energy of the products is greater than the potential energy of the reactants.

UwU

Answer:

A. The Coriolis Effect bends them

Explanation:

The Coriolis Effect is a force that causes objects and other things that are not attached to the ground and which are moving over a large distance around the Earth such as the trade winds or air planes, to take an apparent curved path in their motion rather than moving in a straight line, due mainly to the rotation of the Earth

The Coriolis Effect is named after French mathematical physicist Gaspard-Gustave de Coriolis

Answer:

ionic

Explanation:

because when in molten or dissolved in water  ions are free to move and carry  a charge however when in solid the ions are fixed in position so can't carry a charge.

Answer:

pv=nrt solution re solve it

Answer:

4.12 moles

Explanation:

We can solve this problem with the Ideal Gases Law.

P . V = n . R . T

In our first case we have:

P = 2.3 atm

V = 32.8 L

n = 2.98 moles

T → 35°C + 273 =  308K

Let's replace data for the second case:

2.3 atm . 45.3L = n . 0.082 . 308K

n = (2.3 atm . 45.3L) / (0.082 L.atm/mol.K . 308K)

n = 4.12 moles

Answer:

4.11 moles of H₂ are in a 45.3 L container under the same conditions.

Explanation:

Avogadro's law establishes the relationship between the amount of gas and its volume when the temperature and pressure are held constant.

This law says that the volume of a gas under conditions of constant temperature and pressure is directly proportional to the number of moles of gas. That is, if the amount of gas is increased, the volume will increase; whereas if the amount of gas is decreased, the volume decreases.

Avogadro's law is expressed mathematically as the quotient between the volume and the amount of gas equal to a constant:

[tex]\frac{V}{n} =k[/tex]

Being 1 the initial conditions and 2 the final conditions, the following is satisfied:

[tex]\frac{V1}{n1} =\frac{V2}{n2}[/tex]

In this case:

Replacing:

[tex]\frac{32.8 L}{2.98 moles} =\frac{45.3 L}{n2}[/tex]

Solving:

[tex]n2*\frac{32.8 L}{2.98 moles} =45.3 L[/tex]

[tex]n2=45.3 L*\frac{2.98 moles}{32.8 L}[/tex]

n2= 4.11 moles

4.11 moles of H₂ are in a 45.3 L container under the same conditions.

Answer:

A. neutron

Explanation:

Neutrons cannot be accelerated in an electric or magnetic field because they are neutral in charge.

Answer:

A saturated solution is that which is dissolved as much solute as it is capable of dissolving. By heating the solution a saturated solution can be changed into an unsaturated solution. Without adding any solvent it can be changed into an unsaturated solution. :]

Answer:

compounds are substance which can be formed by chemically combining two or more elements.

mixtures are substance that are formed by physically mixing two or more substances

Answer:

ATP

Explanation:

Answer:

chemical energy

Explanation:

Answer: Outer electrons because they revolve around the nucleus and can be multiple more than one

Explanation:

Hope it helps you you

Answer:

the volume decreases and the pressure increases.

Answer:

When you first set the water balloon on top of the jar, the air pressure outside the jar and the air pressure inside the jar are the same. ... So now there is less air, less stuff, in the jar

Answer:

True- Mirror causes van to appear closer

Explanation:

Objects in the rear view mirror appear closer than they really are.

Vision and area are limited by the mirrors.

Answer:

Explanation:

Water is blue because water absorbs colors in the red part of the light spectrum. Like a filter, this leaves behind colors in the blue part of the light spectrum for us to see.

Answer:

B. A Brønsted-Lowry acid donates a proton and has a matching conjugate base.

Explanation:

Here's HA is bronsted acid and its conjugate base pair is A-.

Answer:

Explanation:

The actual answer is B. The equation has an acid on one side and a base on the other. The acid donates a proton. Donates means gives up the equivalent of a proton.

Answer:

Ethanol (boiling point 78°C) and methanol (boiling point 65°C) are two miscible liquids. There is only a small difference in their boiling points. These two liquids are separated from their mixture by fractional ths distillation.

When vapours of the mixture pass through the fractionating column, repeated liquefaction and vapourisation take place. Subsequently, the vapours of low boiling methanol enter the condenser from the fractionating column, condense to liquid and get collected in the round bottomed flask first. Similarly, ethanol with higher boiling point can be collected later in another round bottomed flask.