what is the atomic number of nickel

Answer:

Kidney & lungs

heart & bladder

bladder & lungs

Explanation:

HOPE THIS HELPS

gas with the smallest amount of molecular weight will effuse the quickest

Answer:

a.

N = +2

O = -2

b.

Na = +1

O = -2

N = +5

c.

O = -2

Al = +3

P = +5

d.

O = -2

Ca = +2

C = +4

e

O = -2

Mn = +7

K = +1

f.

O = -2

K = +1

Cr = +6

g.

O = -2

Cl = +7

Cr = +1

h.

O = -2

H = +1

Cr = +5

i.

O = -2

H = +1

Cr = +3

k.

O = -2

H = +1

Cr = +1

Explanation:

A. NU

Numărul de oxidare a azotului = +2

Numărul de oxidare a oxigenului = -2

b. NaNO₃

Numărul de oxidare de Na = +1

Numărul de oxidare de O = -2

Numărul de oxidare de N = +5

c. AlPO₄

Numărul de oxidare de O = -2

Numărul de oxidare al Al = +3

Numărul de oxidare al P = +5

d. carbonat de calciu

Numărul de oxidare de O = -2

Numărul de oxidare de Ca = +2

Numărul de oxidare de C = +4

e. KMnO₄

Numărul de oxidare de O = -2

Numărul de oxidare al Mn = +7

Numărul de oxidare al lui K = +1

f. K₂Cr₂O₇

Numărul de oxidare de O = -2

Numărul de oxidare al lui K = +1

Numărul de oxidare al Cr = +6

g. HClO₄

Numărul de oxidare de O = -2

Numărul de oxidare al Cl = +7

Numărul de oxidare al Cr = +1

h. HClO₃

Numărul de oxidare de O = -2

Numărul de oxidare al lui H = +1

Numărul de oxidare al Cr = +5

i. HClO₂

Numărul de oxidare de O = -2

Numărul de oxidare al lui H = +1

Numărul de oxidare al Cr = +3

k. HClO

Numărul de oxidare de O = -2

Numărul de oxidare al lui H = +1

Numărul de oxidare al Cr = +1.

Answer:

A

help u and it's A

Explanation:

Answer:

10

Explanation:

ye

Answer:

2

Explanation:

Answer:70%

Explanation:

Answer:

71%

Explanation:

71% of the earth is covered by water and oceans hold about 96 percent of the water

Answer: 318 K

Explanation:

Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.

The combined gas equation is,

[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]

where,

[tex]P_1[/tex] = initial pressure of gas = 231 kPa

[tex]P_2[/tex] = final pressure of gas = 168 kPa

[tex]V_1[/tex] = initial volume of gas = 3.25 L

[tex]V_2[/tex] = final volume of gas = 4.35 L

[tex]T_1[/tex] = initial temperature of gas = [tex]54^oC=273+54=327K[/tex]

[tex]T_2[/tex] = final temperature of gas = ?

Now put all the given values in the above equation, we get:

[tex]\frac{231\times 3.25}{327}=\frac{168\times 4.35}{T_2}[/tex]

[tex]T_2=318K[/tex]

At 318 K of temperature will the same gas take up 4.35 liters of space and have a pressure of 168 kPa

Answer:

96.1 %

Explanation:

Which teacher do you have lol

Answer: False

Explanation:

An acid is defined as the substance which looses hydrogen ion or hydronium ions when dissolved in water.

A base is defined as the substance which looses hydroxide ions when dissolved in water.

If the solution has higher hydronium ion concentration as compared to the hydroxide ion concentration, then the pH will be low and the solution will be acidic.

If the solution has low hydronium ion concentration as compared to the hydroxide ion concentration then the pH will be high and the solution will be basic.

Answer:

the transmission of heat across matter

Explanation:

Conduction is the transmission of heat across matter. Even though heat flows across matter during conduction, the matter itself does not flow.

Explanation:

I don't know how to explain

Answer:

220g of CO2

Explanation:

Step 1:

The balanced equation for the reaction.

2C5H11OH + 15O2 —> 10CO2 + 12H2O

Step 2:

Determination of the number of mole of CO2 produced by burning 1 mole of C5H11OH.

From the balanced equation above,

2 moles of C5H11OH produced 10 moles CO2.

Therefore, 1 mole of C5H11OH will produce = (1 x 10)/2 = 5 moles of CO2.

Therefore, 5 moles of CO2 is produced from the reaction.

Step 3:

Conversion of 5 moles of CO2 to grams.

Molar mass of CO2 = 12 + (2x16) = 44g/mol

Number of mole of CO2 = 5 moles

Mass of CO2 =...?

Mass = mole x molar mass

Mass of CO2 = 5 x 44

Mass of CO2 = 220g.

Therefore, 220g of CO2 were obtained from the reaction.

Answer:

1. 0.422 atmospheres

2. 633281.25 Pascals

3. (a) Move up

(b) 868 mmHg

4. 868 mmHg

5. 775 mmHg

6. Partial pressure of He is 0.64 atm.

Partial pressure of oxygen is 1.29 atm.

Partial pressure of N is 2.57 atm.

7. 445.72 torr.

Explanation:

1. To convert 321  torr to atmospheres

1  atmosphere = 760 torr

∴ 1 torr = 1/760 atmospheres

Hence, 321 torr = 321 × 1/760 = 321/760 atmospheres = 0.422 atmospheres

2. To convert 6.25 atmospheres to Pascals, we have;

1 atmosphere = 101325 Pascals

∴ 6.25 atmospheres = 6.25 × 101325 Pascals = 633281.25 Pascals

3. (a) Here we have, given that the value of the pressure on the bottle = 830 mmHg, when the valve is opened, the mercury in the open-end arm will move up because the pressure of the gas inside the flask is more than the pressure on the other side of the open-end arm

(b) After the mercury stops moving the difference between the two columns will be the difference between the two pressures, that is 830 mmHg - 745 mmHg = 85 mmHg

4. From the diagram, it is seen that the differenc beteen the two columns is 123 mm, therefore, the pressure in the flask is 123 mmHg more than the external pressure, hence the pressure of the as in the flask = 745 mmHg + 123 mmHg = 868 mmHg

5. Here we have that the height of the mercury in the open-end is less than the height of the mercury on the arm closer to the flask, therefore, the pressure of the gas in the flask = 825 mmHg - 50 mmHg = 775 mmHg

6. Number of moles of He = 1 mole

Number of moles of oxygen, O = 2 mole

Number of moles of nitrogen, N = 4 mole

From Dalton's law of partial pressure we have that, the total pressure of a given mass of gas is equal to the partial pressure of the individual gases

[tex]That \ is \ \chi _i = \frac{n_i}{n_{total}} \ and \ P_i = \chi_i \cdot P_{total}[/tex]

Hence;

Total number of moles = 1 + 2 + 4 = 7 moles

Mole fraction of He = 1/7

Partial pressure of He = 1/7×4.5 = 0.64 atm.

Mole fraction of oxygen, O = 2/7

Partial pressure of oxygen= 2/7×4.5 = 1.29 atm.

Mole fraction of N = 4/7

Partial pressure of N = 4/7×4.5 = 2.57 atm.

7. From Boyle's law

P₁×V₁ = P₂×V₂

Hence;

P₂ = P₁×V₁/V₂

Where:

P₁ = Initial pressure = 2.57 atm

V₁ = Initial volume =1.57 liters

V₂ = New volume = 6.88 liters

P₂ = New pressure = 2.57×1.57/6.88  = 0.59 atm.

To convert 0.59 atm. to torr, we multiply by 760 thus;

0.59 atm. = 0.59 × 760 torr = 445.72 torr.

Answer:

The combustion of 59.7 grams of methane releases 3320.81 kilojoules of energy

Explanation:

Given;

CH₄ + 2O₂ → CO₂ + 2H₂O, ΔH = -890 kJ/mol

From the combustion reaction above, it can be observed that;

1 mole of methane (CH₄) released 890 kilojoules of energy.

Now, we convert 59.7 grams of methane to moles

CH₄ = 12 + (1x4) = 16 g/mol

59.7 g of CH₄ [tex]= \frac{59.7}{16} = 3.73125 \ moles[/tex]

1 mole of methane (CH₄) released 890 kilojoules of energy

3.73125 moles of methane (CH₄) will release ?

= 3.73125 moles x  -890 kJ/mol

= -3320.81 kJ

Therefore, the combustion of 59.7 grams of methane releases 3320.81 kilojoules of energy

Answer:

The combustion will release -3,321 KJ/mol of energy

Explanation:

Answer:

The materials are opaque or crystalline from a client to the orientation and type of union between their atoms, forming two types of structures.

These two structures can be crystalline or amorphous.

In the case of being crystalline, these unions do not allow light to pass through the medium of the object or body of said compound, making it totally refract and giving the appearance of OPAQUE.

On the other hand, in those compounds that we call amorphous, the atoms are located in a different way that makes light pass through them, without absorbing or identifying any light beam, so they look transparent.

Explanation:

Example: A glass cup has an amorphous structure, while a porcelain or porcelain plate has a crystalline structure.

Answer:

D) condensing C) boiling

Answer:

Do black hole

Explanation:

Answer:

1.5 L

Explanation:

Step 1:

The balanced equation for the reaction. This is given below:

HCl + NaOH —> NaCl + H2O

From the balanced equation above, The mole ratio of the acid (nA) = 1

The mole ratio of the base (nB) = 1

Step 2:

Data obtained from the question. This includes the following:

Molarity of acid (Ma) = 0.5M

Volume of acid (Va) =..?

Volume of base (Vb) = 1L

Molarity of base (Mb) = 0.75M

Step 3:

Determination of the volume of the acid needed for the reaction.

Using the formula:

MaVa/MbVb = nA/nB

The volume of the acid needed for the reaction can be obtained as follow:

0.5 x Va / 0.75 x 1 = 1

Cross multiply

0.5 x Va = 0.75 x 1

Divide both side by 0.5

Va = 0.75 /0.5

Va = 1.5 L

Therefore, the volume of the acid, HCl needed for the reaction is 1.5L

Answer:

The correct answer is 6.32 ml

Explanation:

We have the following data:

Mass : m = 9.37 g

Density : d= 1.483 g/mL

The density a substance is equal to the mass of the substance divided into its volume. So, we calculate the volume (V) of chloroform from the mass and density as follows:

[tex]d=\frac{m}{V}[/tex]   ⇒  [tex]V = \frac{m}{d} = \frac{9.37 g}{1.483 g/ml} = 6.32 ml[/tex]

Answer:

A. Corn has changed over time due to selective breeding.

Hope this helps :)

Answer:

ok i see it

Explanation:

Answer: the planets, gravity, the galaxies

Explanation:

Write anything you want about it .

For example, there are 8 planets and their names

Answer:

Matter is anything that is made up of atoms. Whether its a computer, a drink, a suitcase, a telephone, whatever.

If it has mass, if it occupies space, and if it has volume, then it is matter.

Also, matter comes in the form of solids, liquids, and gasses.

In this case, the telephone is a solid.

plzzz mark me brainliest if this helped :)

I need 3 more brainliests to become an expert

Answer:

Matter is anything that is made up of atoms.

Explanation:

If it has mass, occupies space, and has volume, then it is matter. Also, matter comes in the form of solids, liquids, and gasses. The telephone is a solid.

Answer:

in w

Explanation:

first blood enter renal artery which enter glomerous( where blood is filtrated) and then to Bowman carpusle(take the filtrated blood)

and then to proximal tubular(absorbed salt) and then to loop of hanle (y)(absorb water) and then to distal tubule then to ureter (z) and then to renal vein(x)(to go to urinary bladder)

Answer:

It a comet

Explanation:

that why they are also called dirty snowballs

Answer:

A comment

Explanation:

Because I took the test and that 100 and because comets are icy and sometimes lead tale of water droplets behind them

Answer:1.08

Explanation:

Answer:

1.08kg/cm^2

Explanation:

Edge2021

Answer:

V = 127.57 mL

Explanation:

In this case, we are having an acid base titration, and this, according to the overall reaction:

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

This reaction was neutralized, so, it's a neutralization reaction, therefore, we can use the following expression for neutralization reactions:

n₁ = n₂  (1)

This is because, in the equivalence point, both moles of the reagents are the same. Now we need to do a relation between this and the actual moles that we have according to the overall reaction.

In this case, we have 2 moles of acid reacting with 3 moles of base, so, the equation (1) is re-written like this:

2n₁ = 3n₂   (2)

Knowing this, and that we have values of concentrations and volume, we can write the expression of moles in terms of molarity and volume:

n = M * V    replacing in (2):

2M₁V₁ = 3M₂V₂   From here, we can solve for V₂ which is the volume of the base:

V₂ = 2M₁V₁ / 3M₂   (3)

Now, all we have to do is replace the given values to obtain the volume of the base:

V₂ = 2 * 1.6 * 59.8 / 3 * 0.5

Answer:

[tex]V_{Ca(OH)_2}=0.287L=287mL[/tex]

Explanation:

Hello,

In this case, given the reaction:

[tex]2 H_3PO_4 + 3 Ca(OH)_2 \rightarrow Ca_3(PO_4)_2 + 6 H_2O[/tex]

We first compute the moles of phosphoric acid that are actually reacting given the volume (must be in litres) and the molarity:

[tex]n_{H_3PO_4 }=1.60\frac{mol}{L}*59.8mL*\frac{1L}{1000mL} =0.0957molH_3PO_4[/tex]

Next, we compute the moles of calcium hydroxide that are reacting by using the 3:2 molar ratio with phosphoric acid:

[tex]n_{Ca(OH)_2}=0.0957molH_3PO_4*\frac{3molCa(OH)_2}{2molH_3PO_4} =0.144molCa(OH)_2[/tex]

Finally, by knowing the 0.500 M of the calcium hydroxide solution we compute the required volume:

[tex]V_{Ca(OH)_2}=\frac{n_{Ca(OH)_2}}{M_{Ca(OH)_2}}=\frac{0.144mol}{0.500\frac{mol}{L} } \\ \\V_{Ca(OH)_2}=0.287L=287mL[/tex]

Best regards.

Answer:

Newton's third law

Explanation:

every action has an equal and opposite reaction.