What is the molarity of a solution with 1.43 moles of sodium chloride in 0.875 liters of solution?

Answer:

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Answer:

The vertebral column holds the body upright. Movement - muscles are attached to bones, which are jointed. When the muscles contract the bones move. Blood production - red blood cells (to carry oxygen) and white blood cells (to protect against infection) are produced in the bone marrow of some bones.

Answer:

False

Explanation:

Answer:

C.

Explanation:

Phase change is physical.  

When Nitrogen gas forms a liquid is a physical change because it was only a state change from solid to liquid. Therefore, option C is correct.

A physical change takes place when some of the features of the matter change but the identity of the material does not. Physical changes can be categorized as reversible and irreversible. For example, the melting of water is reversible since the melted ice can be refrozen.

Physical change can be described as a kind of change where only physical properties of matter such as solubility, color, odor, etc. can change. During physical changes in matter, there will be no chemical bonds are broken or formed between atoms in the molecule.

The chemical composition as well as the chemical nature of the material will remain unchanged while a physical change.  The molecules can rearrange without changing the internal chemical composition of matter.

Therefore, changing the state of nitrogen gas is a physical change.

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Answer:

False

Explanation:

It’s both living and non living

Answer:

False

Explanation:

In biospheres, there are both living and nonliving objects present! There are typically large abundances of living objects, such as animals, trees, grass, etc. There are also nonliving objects included in biospheres that are necessary for the prosperity of the living creatures! Examples of these nonliving objects include water for hydration, air for breathing, soil for growth, etc. A biosphere is where all living things are found on Earth, so the question is false since both types of things are found within them and not just nonliving things!

Answer:

0.11mol/dm³

Explanation:

The reaction expression is given as:

             HCl   +  NaOH  →  NaCl + H₂O

Volume of acid  = 25cm³  = 0.025dm³

Volume of base  = 18.4cm³ = 0.0184dm³

Concentration of base  = 0.15mol/dm³

Solution:

The concentration of hydrochloric acid = ?

 To solve this problem, let us first find the number of moles of the base;

 Number of moles  = concentration x volume

 Number of moles  = 0.15mol/dm³ x 0.0184dm³  = 0.00276mol

From the balanced reaction equation;

          1 mole of NaOH will combine with 1 mole of HCl

Therefore,  0.00276mol of the base will combine with  0.00276mol of HCl

 So;

  Concentration of acid  = [tex]\frac{number of moles }{volume}[/tex]   = [tex]\frac{ 0.00276}{0.025}[/tex]   = 0.11mol/dm³

Answer:

Solubility  = 2.142 x  [tex]10^{-4}[/tex] M

Explanation:

Solution:

Note: This question is incomplete and lacks necessary data to solve this question. But I have found similar question on the internet and fetched the necessary data to solve:

Missing Data:

Number of Moles of N2 dissolved per litre of blood = 5.357 x [tex]10^{-4}[/tex] M

As we know that, the air is approximately. 78 mol % of N2

N2 = 0.78

Partial pressure of the N2 at 100 ft:

Partial Pressure = 0.78 x (4.0)

Partial Pressure = 3.12 atm

Now, this is 4 times the pressure of nitrogen at 1 atm air pressure.

SO,

According to the Henry's Law, we have:

Solubility = k x [tex]P_{g}[/tex]

Here, k = 4 times

So,

Solubility = 4 x (5.357 x [tex]10^{-4}[/tex])

Solubility  = 2.142 x  [tex]10^{-4}[/tex] M

Answer:

I believe it is C.

Explanation:

Everything else is true.

Electromagnetic waves do not need an medium to travel though.

Answer:

C

Explanation:

EM waves need a medium mechanical waves don't

Answer: A  vacuum. Under the same conditions 16 s were required for the same number of moles of O2 to effuse. ... The molar mass of the unknown gas is 200 g/mol. calculation ... QUESTION 1 If gas-burning appliances are vented into an unlined masonry chimney, deteriorate and crumble and may · PLS HELP

Explanation:

Answer:

65

Explanation:

Atomic Number, Protons, and Neutrons are always of the same amount.

Answer:

Magnesium

Explanation:

The element that could provide one atom to make an ionic bond with oxygen is magnesium.

Generally, most group II elements will form an ionic bond with oxygen with just one atom.

An ionic bond forms by the transfer of electrons from one specie to another.

Oxygen has a charge of 2-, to use one atom to form ionic bond with this specie, a magnesium atom with 2+ charge will bond with the specie.

 This will form:

                        MgO

This is notable for other group II elements.

Answer:

The particles in dry ice overcomes the force of attraction between them to change directly to gaseous state.

Explanation:

Matter exists in three states- solid, liquid and gas. When heated, solid changes to liquid and then gas. However, upon condensation, gas changes to liquid and then to solid. Some solids when heated change directly to vapour without an intermediate liquid state, such vapour will also condense to solid without going through the liquid state. Example includes: ammonium chloride, iodine crystals and sulphur. These solids undergo SUBLIMATION.

Dry ice which is also known as solid frozen carbon dioxide can undergo sublimation when subjected to -78°C. What actually happens to the particles ( molecules) of the frozen carbon dioxide is the existence of weak intermolecular forces between the molecules. Since the molecules are very weakly attracted to each other, frozen carbon dioxide molecules very readily go from the solid state to the gas state at low temperatures.

1.47 × 10²¹ molecules OF₂

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

0.132 g OF₂

Step 2: Identify Conversions

Avogadro's Number

Molar Mass of O - 16.00 g/mol

Molar Mass of F - 19.00 g/mol

Molar Mass of OF₂ - 16.00 + 2(19.00) = 54.00 g/mol

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 3 sig figs.

1.47204 × 10²¹ molecules OF₂ ≈ 1.47 × 10²¹ molecules OF₂

Answer:

0°C

Explanation:

The melting point of water - the temperature at which solid water begins to melt - is 0°C at a pressure of 1 atm. In the heating curve of water, below 0°C we have solid water. Then, at 0°C the solid water starts to melt by forming liquid water. Above 0°C, when the total amount of water is in the liquid state, the liquid water begins to heat (it increases its temperature).

Answer:

the answer is 0 degrees C.

Explanation:

Answer:

254.35 g of NaCl.

Explanation:

We'll begin by writing the balanced equation for the reaction between sodium (Na) and chlorine (Cl₂) to produce sodium chloride (NaCl). This is illustrated below:

2Na + Cl₂ —> 2NaCl

Next, we shall determine the mass of Na that reacted and the mass of NaCl produced from the balanced equation. This can be obtained as follow:

Molar mass of Na = 23 g/mol

Mass of Na from the balanced equation = 2 × 23 = 46 d

Molar mass of NaCl = 23 + 35.5

= 58.5 g/mol

Mass of NaCl from the balanced equation = 2 × 58.5 = 117 g

SUMMARY:

From the balanced equation above,

46 g of Na reacted to produce 117 g of NaCl.

Finally, we shall determine the mass of NaCl produced by the reaction of 100 g of Na. This can be obtained as follow:

From the balanced equation above,

46 g of Na reacted to produce 117 g of NaCl.

Therefore, 100 g of Na will react to produce = (100 × 117)/46 = 254.35 g of NaCl.

Thus, 254.35 g of NaCl were obtained from the reaction.

Answer:

3

Explanation:

you must multiply everything out till everything is equal on both sides

Answer:

F=500×3 = 1500 N

W = 1500×10 =15000 Nm

Explanation:

A. lithium hydroxide =LiOH

B. sodium cyanide =NaCN

C. Magnesium nitrate = Mg(NO3)2

D. Barium sulfate = BaSO4

E. Aluminum nitride = AlN

F. Potassium phosphate = KH2PO4

G. Ammonium bromide = NH4Br

H.Calcium carbonate = CaCO3

Answer:

0.6 Ω

Explanation:

From the question given above, the following data were obtained:

Voltage (V) = 12 V

Current (I) = 20 A

Resistance (R) =?

From Ohm's law,

V = IR

Where:

V => is the voltage

I => is the current

R => R is the resistance

With the above formula, we can obtain the resistance as follow:

Voltage (V) = 12 V

Current (I) = 20 A

Resistance (R) =?

V = IR

12 = 20 × R

Divide both side by 20

R = 12 / 20

R = 0.6 Ω

Thus the resistance is 0.6 Ω

Explanation:

Elements are pure substances made up of only atoms that all have the same number of protons in their nuclei. Compounds are molecules held together by covalent bonds. Ionic compounds are held together by ionic bonds. Intermetallic compounds are held together by metallic bonds. Certain complexes are held together by coordinate covalent bonds. A mixture is a combination of two or more elements or compounds which haven't bonded yet, so each mixture is it's own.

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Answer:

A 3 meters

Explanation:

A crest of the wave is the highest peak in the wave that shows the maximum displacement value. The intersection of the 3-meter and 2-meter waves results in amplitude of 1 meter. Thus, option D is correct.

The amplitude of the wave is the measurement of the wave from the still position towards the crest or the trough of the wave. It is estimated in meters.

The elevation of the wave is at 3, and the depression is at 2 meters when intersected, which results in an amplitude causing destructive interference. As 3 m is above the baseline and 2 m is below the baseline the resulting amplitude will be, 3 - 2 = 1 m.

Therefore, the resulting amplitude is 1 meter.

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Answer:Radio waves move through the air at the same speed as visible light, Sound waves are mechanical waves all sound waves regardless of there spee or frequency.

Explanation: I got my answer from stemscopes.

Answer:

A

Explanation:

more particles means things are heating up

Ex: Water. More bubbles form once water reaches it boiling point

Answer:

Indeed, most ionic compounds contain polyatomic ions. Well-known examples are sodium hydroxide (NaOH) with OH- as the polyatomic anion, calcium carbonate (CaCO3), and ammonium nitrate (NH4NO3), which contains two polyatomic ions: NH+ and NO3-.

Explanation:

hope it helps

The Answer is e. ClO₅⁻

explanation:

a.   Sr⁺²   is mono ionic with positif charge

b.  CH₃COOH is a neutral molecule, not an ion

c.   LiBr is a neutral molecule, not an ion

d.  O₃ is a neutral molecule, not an ion

e.   ClO₃⁻  is a polyatomic ion

* Polyatomic ion is ion that performed from more that one atom

answer:

The mass of 4×10²¹ atoms Pt is ≈ 1 g Pt.

explanation:

Answer:Waves.sry if this is wrong.

Explanation: