Hallo PLEASE HALP WILL MARK THE BEST OR WHATEVER ITS CALLED (btw meh teacher made it)

Answer:

correct is A, but it isn't quite right. Only when the electronegativity values of the two atoms are the same will the bond be 100% covalent.

5 atoms 1 potassium, 1 chlorine, and 3 oxygens, in total that is five

Answer:

[tex]737.45 \times {10}^{23} [/tex]

hope this will be true...

Answer:

evaporation

Explanation:

Answer:

It is decreased to one third of its original volume

Explanation:

Answer:

2.8 x 10²³ molecules H₂O

1.4 x 10²³ molecules O₂

Explanation:

First, you will need the balanced chemical equation for the formation of water:

2H₂ + O₂ -> 2H₂O

This will help in determining the mole ratios between water and oxygen, which we will need later.

Let's first calculate the number of H₂O (water) molecules. This will require stoichiometry. We are also given the mass, so we must convert mass into moles, then moles into molecules. mass -> moles -> molecules

8.5 g H₂O x (1 mol H₂O/18.01528 g H₂O) x (6.02 x 10²³ molecules H₂O/1 mol H₂O) = 2.8404 x 10²³ molecules H₂O

Rounded to 2 significant digits: 2.8 x 10²³ molecules H₂O

Now, to find the molecules of water, we can begin with the same stoichiometric equation, but before we convert to molecules, we will have to convert moles of water to moles of oxygen. This is where we will use the mole ratio of water to oxygen we got from the balanced chemical equation earlier. 2H₂O:1O₂

8.5 g H₂O x (1 mol H₂O/18.01528 g H₂O) x (1 mol O₂/2 mol H₂O) x (6.02 x 10²³ molecules O₂/1 mol O₂) = 1.4202 x 10²³ molecules O₂

Rounded to 2 significant digits: 1.4 x 10²³ molecules O₂

Answer:

Calcium phosphide (D)

Explanation:

Hope I helped^^

Can i please get brainliest

The limiting reactant : Na₂S

Reaction

Cu(NO₃)₂ (aq) + Na₂S (aq) ⇒ 2 NaNO₃ (aq) + CuS (s)

mol Cu(NO₃)₂ :(MW 187,56 g/mol)

[tex]\tt mol=\dfrac{469}{187.56}=2.5[/tex]

mol Na₂S :(MW 78,0452 g/mol)

[tex]\tt mol=\dfrac{156}{78.0452}=2.0[/tex]

Limiting reactant(smaller ratio⇒ between mol and coefficient) :

1 mol Cu(NO₃)₂ : 1 mol Na₂S , so the limiting reactant : Na₂S( 2 < 2.5)

Answer:I believe its A. There noble gasses so there happy with there electron count!

Explanation:

Group 18 noble gases are relatively inert because their s and p orbitals are filled, meaning their outer energy level is filled. Therefore option 1 is correct.

The noble gases, which include elements like helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn), belong to Group 18 (VIII A) of the periodic table.

These elements have a full complement of electrons in their outermost energy level, also known as the valence shell. This outermost energy level is comprised of s and p orbitals.

Having a filled outer energy level makes noble gases highly stable and unreactive. The stability arises from the fact that their electron configurations are complete, meaning they have achieved a configuration similar to the noble gas that precedes them in the periodic table.

Because noble gases have no missing or unpaired electrons in their outer energy levels, they have little tendency to gain, lose, or share electrons with other atoms.

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Answer:

Earth’s tectonic plates fit together in a jigsaw puzzle of plate boundaries.

The Earth’s outer shell, the lithosphere, consisting of the crust and uppermost mantle, is divided into a patchwork of large tectonic plates that move slowly relatively to each other. There are 7-8 major plates and many minor plates. Varying between 0 to 100mm per year, the movement of a plate is driven by convection in the underlying hot and viscous mantle.

Explanation:

Answer:

IF(subscript 5)

Explanation:

covalent.

The bond present between the iodine and fluorine in iodine pentafluoride has been a nonpolar covalent bond.

The intermolecular bonds between the atoms result in the stability of the compounds. The bonds formed between the atoms with the same electrical charge and less difference in the electronegativity have been the nonpolar covalent bonds.

The iodine and fluorine have been the halogen atoms with a negative charge and less difference in electronegativity. Thus, the bond present between the iodine and fluorine in iodine pentafluoride has been a nonpolar covalent bond.

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Answer:

60

Explanation:

hope this helps :)

If a diver's tank is filled with a helium-oxygen mixture to a pressure of 170 atm and the partial pressure of helium is 110 atm, the partial pressure of the oxygen is 60 atm.

Dalton's theory of partial pressure states that total pressure of any mixture of gas is equal to the sum of the partial pressure of each gas present in that.

Given that total pressure of mixture = 170 atm

Partial pressure of helium = 110 atm

Partial pressure of oxygen = 170 - 110 = 60 atm

Hence partial pressure of oxygen gas is 60 atm.

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Answer:

the volume should be in cubic cm so I assumed that you wanted to write the same . then the answer is 5489.07 kg/m^3

Answer:

[tex]\boxed {\boxed {\sf d\approx5.49 \ g/cm^3}}[/tex]

Explanation:

Density can be found by dividing the mass by the volume.

[tex]d=\frac{m}{v}[/tex]

The mass of the rock is 555 grams and the volume is 101.1 cubic centimeters.

[tex]m=555 \ g \\v= 101.1 \ cm^3[/tex]

Substitute the values into the formula.

[tex]d=\frac{555 \ g}{101.1 \ cm^3}[/tex]

Divide.

[tex]d=5.48961424 \ g/cm^3[/tex]

Let's round to the nearest hundredth to make the answer more concise.

The 9 in the thousandth place tells us to round up. In the tenth place, the 8 will become a 9.

[tex]d\approx5.49 \ g/cm^3[/tex]

The density of the rock is about 5.49 grams per cubic centimeter.

Answer:

D. A north pole and south pole attract each other

Answer:

D

Explanation:

Answer:

its looks unbalanced too me

Explanation:

Answer:that is called Evaporation!

Explanation:

Answer:

Q = 1461.6 J

Explanation:

Given data:

Mass of ice = 36 g

Initial temperature = -20°C

Final temperature = 0°C

Amount of heat absorbed = ?

Solution:

specific heat capacity of ice is 2.03 j/g.°C

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = T2 - T1

ΔT =  0°C - (-20°C)

ΔT = 20°C

Q = 36 g ×2.03 j/g.°C×20°C

Q = 1461.6 J

Answer:

E. just before it reaches the ground.

Explanation:

The "kinetic energy" refers to the energy when an object moves or is in motion. When the ball leaves the racket, it is considered to have a great amount of kinetic energy. However, this decreases as the ball reaches its maximum height, but the potential energy is at its highest. Upon falling down, its kinetic energy increases but its potential energy decreases.

Provided that there's no air resistance, the speed of falling is even faster for the ball because of gravity and nothing is slowing it down, which means it will have a maximum kinetic energy just before it reaches the ground.

Answer:

1.10 g H2

Explanation:

Answer:

In every body cell

Explanation:

Answer: in every body cell

Explanation:

Answer:

d = 0.98 g/L

Explanation:

Given data:

Density of acetylene = ?

Pressure = 0.910 atm

Temperature = 20°C (20+273 = 293 K)

Solution:

Formula:

PM = dRT

R = general gas constant = 0.0821 atm.L/mol.K

M = molecular mass = 26.04 g/mol

0.910 atm × 26.04 g/mol = d × 0.0821 atm.L/mol.K×293 K

23.7  atm.g/mol = d × 24.1 atm.L/mol

d = 23.7  atm.g/mol / 24.1 atm.L/mol

d = 0.98 g/L

Answer:D) Cl-

Explanation:

Only cations are positive (+)

Cations are positively charged ions. Negatively charged ions are called anions. Among the given ions, Cl- is not a cation. It is an anion.

Ions are charged atoms formed by loss or gain of electron by atoms. Atoms with extra electrons or electron deficient will loss or gain electrons in order to achieve octet.

When atoms loss electrons, the number of their protons become dominant and they acquire positive charge.  When atoms gain electrons the number of electrons become dominant and atoms become negative charged.

The positive charged ions are called cations and negative charged ions are called anions. For example when potassium K loss one electron, it forms K+ ion. Similarly when Cl gain an electron it forms the anion Cl-.

Therefore, the one which is not cation among the given ions is Cl-.

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Answer: The formula mass for sodium sulfate was calculated on page T-9. Referring to those numbers, the formula Na2SO4 means: two moles sodium (45.98 g), one mole is (32.06 g.

Explanation: Your welcome.

Answer:

480 million years old

Explanation:

Answer:

Copper (I) hydroxide

Explanation:

Copper (I) hydroxide is a chemical compound with the chemical formula of CuOH. One copper atom (Cu), one oxygen atom (O), and one hydrogen atom (H.)

Answer:

d

Explanation:

Answer:

The Sun radiates huge amounts of energy. Only a small portion of that energy hits the Earth, but it is enough to light our days, heat our air and land, and create weather systems over the oceans. Most of the energy you will learn about comes from the Sun. The Earth also gives off energy.

Explanation:

Answer:

"The Sun radiates huge amounts of energy. Only a small portion of that energy hits the Earth, but it is enough to light our days, heat our air and land, and create weather systems over the oceans. Most of the energy you will learn about comes from the Sun. The Earth also gives off energy."

By the way I got this off thee internet and copy  and pasted it so don't write it just look and write in your own words please. Please do not copy and paste or write what i wrote because this is someone else's explanation or answer

Hope this helps!! Also please rank thank you.

Explanation:

Answer:

C

Explanation:

The order of increasing size are electron, neutron, nucleus and atom.

The size of electron is the smallest among the given particles which followed by neutron that is bigger in size from electron but smaller than nucleus. Proton and neutron are located in the nucleus of an atom so it is bigger in size than neutron.

Atom is the largest among the given substances in which nucleus is present at the center and electrons are revolving around the nucleus in fixed orbits so we can conclude that electron is the smallest and atom is the largest particle.

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