Classify the following as a chemical or
physical property:
Sodium metal boils at
883 degrees C.
A.chemical
B.physical

Answers

Answer 1
Boiling point is a physical property. So, the answer here would be B.

Related Questions

5. What type of level detector is not affected by the liquid's viscosity, density, conductivity or color and
is very accurate?
a. Radiation
b. lonization
c. Photoelectric
d. Infrared

Answers

infrared i’m pretty sure

Vishwanath had some money. he spent 3 upon 4 part of money to buy goods for his birthday,1 upon 5 part of money give to his sister and the rest of Rs.40 to mother how much did he have at first ​

Answers

Answer:

The correct answer is - 800.

Explanation:

Given:

Total amount = ? or assume x

spend in buying birthday item = 3/4 of x

given to sister = 1/5 of x

remaining to mother = 40

solution:

the remaning amount = x- (3x/4+x/5) = 4=

=> x- 19x/20 = 40

=> x = 20*40

=> x = 800

thus, the correct answer is = 800

If aluminum has a mass of 22.3 g, how many liters of oxygen gas are required at STP?

Answers

Answer:

27.8

Explanation:

Calculate the pH of a solution with [H+] = 1.8 x 10^-5 M

Answers

Answer:

4.74

Explanation:

pH= -log[H+]

pH= -log(1.8 x 10^-5)= 4.74

7. Indicate if the following are correct or incorrect.
1s2
6s3
5f10
4d3
2d4
3p10

Answers

Answer:

1s2: correct.

6s3: incorrect because the subshell s can hold up to 2 electrons.

5f10: correct.

4d3: correct.

2d4: incorrect because the second energy level just has the s and p subshells.

3p10: incorrect because the p subshell can hold up to 6 electrons.

Explanation:

Hello there!

In this case, according to the attached file, which shows the correct orbitals and electrons, we can proceed as follows:

1s2: correct.

6s3: incorrect because the subshell s can hold up to 2 electrons.

5f10: correct.

4d3: correct.

2d4: incorrect because the second energy level just has the s and p subshells.

3p10: incorrect because the p subshell can hold up to 6 electrons.

Best regards!

the name of the acid present in milk

Answers

Answer:

lactic acid

The real acidity of milk is due to lactic acid. This is never found in milk when it is first drawn from the udder. It is produced by the action of the lactic acid organisms on the milk sugar. The so-called apparent acidity of milk is what gives fresh milk its acid reaction.

2 CO + O2 → 2 CO2, how many grams of oxygen is required to produce 1.0 mole of CO2?

Answers

Answer:

16 g

Explanation:

Step 1: Write the balanced equation

2 CO + O₂ → 2 CO₂

Step 2: Calculate the moles of O₂ required to produce 1.0 moles of CO₂

The molar ratio of O₂ to CO₂ is 1:2.

1.0 mol CO₂ × 1 mol O₂/2 mol CO₂ = 0.50 mol O₂

Step 3: Calculate the mass corresponding to 0.50 moles of O₂

The molar mass of O₂ is 32.00 g/mol.

0.50 mol × 32.00 g/mol = 16 g

For each of the following compounds, decide whether the compound's solubility in aqueous solution changes with pH. If the solubility does change, pick the pH at which you'd expect the highest solubility.

a. Ca(OH)2
b. CuBr
c. Ca3(PO4)2

Answers

Answer:

1. Ca(OH)₂ : Yes

Highest solubility  = pH of 2

2. Cu Br : Yes

Highest solubility  = pH of 4

3. Ca₃(PO₄)₂ : Yes

Highest solubility = pH of 2

Explanation:

From the common ion effect, the solubility of an ionic compound in a solution which already contains one of the ions in that compound will reduce. This is because, when an external stress is placed on a system in equilibrium,  the equilibrium position will shift to remove the effect of that stress. Therefore, when more of the same ions are added to a solution already containing that ion, equilibrium will shift towards removal of the ion, thereby reducing solubility.

1. For Ca(OH)₂:

Ca(OH)₂ is a fairly soluble ionic compound whose dissociation equation is given below:

Ca(OH)₂ (s) ----> Ca²+ (aq) + 2 OH- (aq)

Increase in pH will result in addition of more OH- ions, therefore, its solubility will decrease. On the other hand, a decrease in pH will remove OH- ions, thereby increasing solubility. The pH of highest solubility is 2.

2. For CuBr:

CuBr is a slightly acidic salt as it is salt of a strong acid, HBr and a weak base Cu(OH)₂. Hydrolysis of the salt will result in an acidic medium:

2 CuBr (s) + 2 H₂O (l) ----> 2 HBr (aq) + Cu(OH)₂ (aq).

Thus, an increase in pH will result in an increase in the solubility of CuBr due to the removal of H+ ions. The highest solubility will be at pH of 4.

3) For Ca₃(PO₄)₂

Calcium phosphate is a salt of slightly basic salt as it is a salt of a weak acid, H₃PO₄ and stronger base Ca(OH)₂.

Hydrolysis of the salt will result in a basic medium:

Ca₃(PO₄)₂ (s) + 6 H₂O (l) ---> 3 Ca(OH)₂ (aq) + 2 H₃PO₄ (aq)

Therefore, its solubility increases with decrease in pH due to the removal of OH- ions. The highest solubility will be at pH of 2.

Zn(s), Zn(NO3)2 (0.3 M) || Cu(s), CuCl2 (0.5 M)

(Need help solving these questions, so I can solve the rest of the questions like this in my lab. It is greatly appreciated. Thank you)

2. Write the half reactions that occur at the anode and cathode in this electrochemical cell. Annotate which half reaction occurs at the anode and the cathode.
3. Write the overall balance reaction of this electrochemical cell.
4. Calculate E°cell of this electrochemical cell. (include units)
5. Calculate the reaction quotient (Q) of this reaction.
6. Calculate the expected Ecell for this reaction

Answers

Answer:

See Explanation

Explanation:

At the anode;

Zn(s) -----> Zn^2+(aq) + 2e

At the cathode;

Cu^2+(aq) + 2e ------> Cu(s)

Overall electrochemical reaction;

Zn(s)  + Cu^2+(aq) ------>  Zn^2+(aq) + Cu(s)

E°cell = E°cathode - E°anode

E°cell = 0.34 - (-0.76)

E°cell = 1.1 V

Q = [0.3 M]/[0.5 M]

Q = 0.6

From Nernst equation;

Ecell =  E°cell - 0.0592/n log Q

Ecell = 1.1 - 0.0592/2 log (0.6)

Ecell = 1.1 - 0.0296 log (0.6)

Ecell = 1.11 V

What type of reaction is illustrated below?2H1 --> H2 + 12

Answers

Answer:

Decomposition reaction.

Explanation:

2HI —> H₂ + I₂

From the above equation, we can see clearly that HI undergoes a reaction to produce H₂ and I₂ which are the elements that make up HI.

Therefore, the equation illustrated above is a decomposition reaction because HI breaks into H₂ and I₂

NOTE: Decomposition reaction is a reaction in which a compound splits or breakdown into two or more simple elements or compound.

The pH of a solution can be calculated using which formula?

Answers

Answer:

The formula for calculating pH is pH=−log[H_3O+ ]

pH is the negative logarithm (to base 10) of hydronium ion concentration

The pH Formula can also be expressed as

PH= - log[H+ ]

2. How many chlorine atoms are in 4 moles of chlorine?

Answers

Answer:

4

Explanation:

I’m thinking it’s 4 too

Hi can someone please help me with this. I would really appreciate it. It’s kind of urgent. Thank u so much!

Answers

Answer:

a) The system is in equilibrium

b) No other force is acting on the system

Explanation:

a) The forces in a system is balanced until and unless there is equal and opposite force acting on the system. In this image the upward force is equal to the downward force on the book and the table and hence it is in equilibrium

b) An object which is in static mode, produces downward force because of weight and in response to that a normal reaction is produced in upward direction. Apart from these two forces, no other force is acting on this book and table system.

In the following reaction, if you wanted to produce more hydrochloric acid (HCl), what should you do? (2 points)
4HCl + O2 ⇄ 2H2O + Cl2

a. add more H2O
b. add more O2
c. remove H2O
d. remove Cl2

Answers

Answer:

Add more H2O

Explanation:

Took the test

If you wanted to produce more hydrochloric acid (HCl), you should add more [tex]H_2O[/tex] to 4HCl + [tex]O_2[/tex] ⇄ 2[tex]H_2O[/tex] + [tex]Cl_2[/tex]. Hence, option A is correct.

What is hydrochloric acid?

Hydrochloric acid [[tex]H^+[/tex]](aq) [tex]Cl^-[/tex](aq) or [tex]H_3O^+ Cl^-[/tex]], also known as muriatic acid, is an aqueous solution of hydrogen chloride.

For instance, adding a strong acid such as HCl to water results in the reaction HCl + [tex]H_2O[/tex] → [tex]H_3O^+[/tex] + [tex]Cl^-[/tex].

In other words, the proton ([tex]H^+[/tex]) from the acid binds to neutral water molecules to form [tex]H_3O^+[/tex] raising the concentration of [tex]H^+[/tex].

Hence, option A is correct.

Learn more about hydrochloric acid here:

https://brainly.com/question/4902679

#SPJ2

more reactive material can help to stop iron rusting true or false​​

Answers

Answer: Galvanising is a method of rust prevention. The iron or steel object is coated in a thin layer of zinc. This stops oxygen and water from reaching the metal underneath - but the zinc also acts as a sacrificial metal . Zinc is more reactive than iron, so it oxidises in preference to the iron object.

Explanation:

What are the 4 different materials that come together to make up a bone?

Answers

Answer:

calcium, mineral hydroxyapatite, protein collagen and the tough fibrous component of tendons and ligaments

Explanation:

hope this helps :)

What causes a blue block to appear blue in the sunlight?

Group of answer choices

the blue block reflects all blue light and absorbs all other light

the blue block absorbs blue light and reflects all other light

only blue light is refracted and all other light is absorbed into the block

only blue light transmits through the block and all other light is reflected

Answers

Answer:

sadgsddagd

Explanation:

how are you doing?

Which product is often derived from the natural environment?

Answers

Answer:

coal, cotton, chinese tradictional medicine

Hey can someone pls help me answer these questions? It should be easy maybe. It’s just science. The question just won’t to know where you would put the arrow above to show the motion of the plates. Where would I put it?

Answers

Hehehehwgwgw. Be the hardest thing ever for a long day and I have a windows

what do you understand by atomic theory​

Answers

Answer:

Explanation:

All material substances are composed of minute particles or atoms of a comparatively small number of kinds and all the atoms of the same kind are uniform in size, weight, and other properties.

Hope this helped!!

Answer:

Atomic theory states that matter is composed of particles called atoms.

Explanation:

According to the theory, all types of matter can be divided into smaller parts, to the point it's indivisible.

An atom can be defined as the basic particle that composes a chemical element.

John Dalton's Atomic Theory:

All matter is made of atoms, which are indivisible.All atoms of a given element are identical in mass and properties.Compounds are combinations of two or more different types of atoms. A chemical reaction is a rearrangement of atoms.

Dalton's theory was further modified by the discovery of sub-atomic particles, like the electrons, neutrons and protons.

how can CN carry negative charge​

Answers

Answer:

Cyanide contains two atoms having carbon and nitrogen. Which are bonded through two two pi and one sigma bond by sharing of the electron . As a result one lonepair of electron remains in Cyanide. Hence Cyanide have a negative charge.

Explanation:

#sasha

The half-cell is a chamber in the voltaic cell where one half-cell is the site of the oxidation reaction and the other half-cell is the site of the reduction reaction. Type the half-cell reaction that takes place at the anode for the cobalt-silver voltaic cell. Indicate the physical states using the abbreviation (s), (l), or (g) for solid, liquid, or gas, respectively. Use (aq) for an aqueous solution. Do not forget to add electrons in your reaction.

Answers

Answer: Anode : [tex]Co(s)\rightarrrow Co^{2+}(aq)+2e^-[/tex]

Cathode :  [tex]Ag^+(aq)+e^-\rightarrrow Ag(s)[/tex]

Explanation:

Electrochemical cell is a device which is used for the conversion of the chemical energy produces in a redox reaction into the electrical energy.

The standard reduction potential for cobalt and silver are as follows:

[tex]E^0_{Ag^+/Ag}=+0.80V[/tex]

[tex]E^0_{Co^{2+}/Co}=-0.277V[/tex]

Reduction takes place easily if the standard reduction potential is higher (positive) and oxidation takes place easily if the standard reduction potential is less (more negative).

Here Co undergoes oxidation by loss of electrons, thus act as anode. Silver undergoes reduction by gain of electrons and thus act as cathode.

Anode : [tex]Co(s)\rightarrrow Co^{2+}(aq)+2e^-[/tex]

Cathode :  [tex]Ag^+(aq)+e^-\rightarrrow Ag(s)[/tex]

Overall reaction : [tex]Co(s)+2Ag^+(aq)\rightarrrow Co^{2+}(aq)+2Ag(s)[/tex]

A que se denomina función química

Answers

En química, el grupo de algunas sustancias compuestas que poseen propiedades químicas semejantes, denominadas propiedades funcionales, recibe el nombre de función química. ... Además están divididas en ácidos, bases, sales y óxidos; y funciones orgánicas que son las relativas a los compuestos orgánicos.

BRAINLIST

what conditions are needed to prevent iron from rusting?​

Answers

9 Ways to Prevent Rust
Use an Alloy. Many outdoor structures, like this bridge, are made from COR-TEN steel to reduce the effects of rust. ...
Apply Oil. ...
Apply a Dry Coating. ...
Paint the Metal. ...
Store Properly. ...
Galvanize. ...
Blueing. ...
Powder Coating.

A solution is prepared by dissolving 0.23 mol of hypochlorous acid and 0.27 mol of sodium hypochlorite in water sufficient to yield 1.00 L of solution. The addition of 0.05 mol of HCl to this buffer solution causes the pH to drop slightly. The pH does not decrease drastically because the HCl reacts with the ________ present in the buffer solution. The Ka of hypochlorous acid is 1.36 × 10-3.

Answers

Answer:

hypochlorite ion

Explanation:

The hypochlorous acid, HClO, is a weak acid with Ka = 1.36x10⁻³, when this acid is in solution with its conjugate base, ClO⁻ (From sodium hypochlorite, NaClO) a buffer is produced. When a strong acid as HCl is added, the reaction that occurs is:

HCl + ClO⁻ → HClO + Cl⁻.

Where more hypochlorous acid is produced.

That means, the HCl reacts with the hypochlorite ion present in solution

Which is a correct comparison between the modern quantum model and John Dalton’s model of the atom?

Answers

Answer:

No comparison => John Dalton did NOT postulate an atomic structure.

Explanation:

Dalton's postulates are based upon generalizations of observable phenomena. Micro structure was not proposed.  The atomic structure that's accepted in the scientific community evolved from conclusions of ...

Thompson's raisen pudding model => electrons suspended in a positive matrix

Rutherford's shell model => dense positive nucleus surrounded by an electron cloud. (No fine structure postulated)

Bohr Concentric Ring Model => electrons orbiting a positive nucleus in discrete  energy levels much like planets orbiting the sun.

Schrodinger - Dirac Quantum Models => electrons occupying specific orbital energy levels as based upon statistical wave mechanics.

   

Many tall trees grow in a forest. Only a few small plants grow underneath the trees. Why is this so?

Answers

Answer:

Because as more and more trees are tall, they end up blocking the sun to the smaller vegetation and so many plants end up dying or they evolve to grow taller and taller as a way to stay alive.

Explanation:

Think about a single cell and its parts; for example, think about a cell inside the human body. Now, select an everyday object that could be used as a model for a cell and its parts. In words and/or pictures, describe your model and how it is like the cell.

Answers

Answer:

Mitochondria

Hydraulic Dams

Ribosomes

Small Shops

Nucleus

Town Hall

Endoplasmic Reticulum

Railroad Tracks

Golgi Bodies

Post Office

Cytoplasm

Clean Air and Water

Protein

Widget

Cell Membrane

Fence

Lysosomes

Scrap Yard

Nucleolus

Carpenter's Union

Vacoule

Warehouse

here is some ideas

Fish need about 5 ppm oxygen dissolved in water to survive. Will water with 5 mg oxygen per
liter sustain the fish?

Answers

5mg in liter is 5 ppm

Explanation: 1 ppm is one part per million.

1 ppm is 1 mg is one part of million from 1 kg = 1000 000 mg

1 litre water is 1. Kg.

what are super fuels? Describe both types with examples. In your view, what makes super fuels? ​

Answers

[tex]\bcancel{\huge\pink{\fbox{\tt{࿐αɴѕωєя࿐}}}}[/tex]

Super fuel or high performance fuel is petrol with a higher octane rating. Most standard brands of fuel have a 95 octane rating. But super fuel typically has a higher rating - around 98 - which can make the engine work more efficiently and improve performance.
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