Areas of the earth with lots of direct sunlight have warm air.explain why warm air rises and leaves pockets of low pressure behind ?

The daughter isotope (a decay product)of O-15 = N-15(Nitrogen 15)

Radioactivity is the process of unstable isotopes to stable isotopes by decay, by emitting certain particles,  

O-15 emits positron particles ₁e⁰, so the atomic number decreases by 1, the mass number is the same

Reaction

 [tex]\tt _8^{15}O\Rightarrow _7^{15}N+_1^0e[/tex]

The mass number of the daughter isotope = 15, atomic number = 7

If we look at the periodic system, the element with atomic number 7 is Nitrogen (N)

The new temperature : 11.56 °C

Boyle's law and Gay Lussac's law  

[tex]\tt \dfrac{P_1.V_1}{T_1}=\dfrac{P_2.V_2}{T_2}[/tex]

P1 = initial gas pressure (N/m² or Pa)  

V1 = initial gas volume (m³)  

P2 = final gas pressure  

V2 = final gas volume

T1 = initial gas temperature (K)  

T2 = final gas temperature  

V₁=4.39 L

T₁=44+273=317 K

P₁ = 729 torr = 0,959211 atm

V₂=3.78 L

P₂= 1 atm

[tex]\tt \dfrac{0.959211\times 4.39}{317}=\dfrac{1\times 3.78}{T_2}\\\\T_2=\dfrac{1\times 3.78\times 317}{0.959211\times 4.39}\\\\T_2=284.559~K=11.56~C[/tex]

Answer:

1- water is ice

2- ice is water

Explanation:

1- the water is just froze

2- the ice is just solid water

Answer:

25.89  × 10²³ molecules

Explanation:

Given data:

Mass of CoCl₂ = 560 g

Number of molecules present = ?

Solution:

Number of moles of CoCl₂:

Number of moles = mass/molar mass

Number of moles = 560 g/ 129.84 g/mol

Number of moles = 4.3 mol

Avogadro number:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ molecules

4.3 mol ×  6.022 × 10²³ molecules /1 mol

25.89  × 10²³ molecules

A nucleus is an organelle found in the eukaryotic cells. Inside it's fully enclosed nuclear membrane, it contains the minority of the cell's genetic material. This material would be called DNA molecules.

Hope this helps! If not I'm so sorry. Have a lovely day

Answer:

206 kj of heat is required to boil 78.5 kg of water at its boiling point

The pH of this solution : 0.699

pH is the degree of acidity of a solution that depends on the concentration of H⁺ ions. The greater the value the more acidic the solution and the smaller the pH.  

pH = - log [H⁺]  

So that the two quantities between pH and [H⁺] are inversely proportional because they are associated with negative values.  

A solution whose value is different by n has a difference in the concentration of H⁺ ion of 10ⁿ.  

A solution has a [H+] of 0.20 M, so [H⁺]=0.2

[tex]\tt pH=-log[H^+]\\\\pH=-log[0.2]\\\\pH=1-log~2\\\\pH=0.699[/tex]

Answer:

No it's not make device work

Explanation:

I think soo

Answer:

The energy of atomic orbitals increases as the principal quantum number, n, increases. In any atom with two or more electrons, the repulsion between the electrons makes energies of subshells with different values of l differ so that the energy of the orbitals increases within a shell in the order s < p < d < f.

Explanation:

Answer:

SI unit: kg/m³

but g/cm³ is commonly used

Explanation:

Answer:

The atomic mass number is the number of protons and neutrons in an atom.

Answer:

this showed that the cathode rays traveled in straight line

Answer: The strange liquid would float to the top of a cup of water.

Explanation:

Density = Mass/Volume

Strange Liquid Density = 70g/84mL

Strange Liquid Density = 0.833g/mL

Density of water in g/mL = 1 g/mL

Strange Liquid Density < Water Density

A substance with a lower density would be suspended above a substance with a higher density.

Since the density of the strange liquid is less than that of water, it would float to the top of a cup of water.

Answer:

2726.85 °C

Explanation:

Given data:

Initial pressure = 565 torr

Initial temperature = 27°C

Final temperature = ?

Final pressure = 5650 torr

Solution:

Initial temperature = 27°C (27+273 = 300 K)

According to Gay-Lussac Law,

The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.

Mathematical relationship:

P₁/T₁ = P₂/T₂

Now we will put the values in formula:

T₂  = P₂T₁ /P₁

T₂  = 5650 torr × 300 K / 565 torr

T₂  = 1695000 torr. K /565 torr

T₂ = 3000 K

Kelvin to degree Celsius:

3000 K - 273.15 = 2726.85 °C

Answer:

circulatory system, lymphatic system

Explanation:

I just did the assigment and got it right.

Answer:

The wick burning

Explanation:

a=b=33400 J

c=4180 J

Further explanation

Heat can be calculated using the formula:  

Q = mc∆T  

Q = heat, J  

m = mass, g  

c = specific heat, joules / g ° C  

∆T = temperature difference, ° C / K  

The heat to change the phase can be formulated :

Q = mLf (melting/freezing)

Q = mLv (vaporization/condensation)

Lf=latent heat of fusion

Lv=latent heat of vaporization

The heat of fusion for water at 0 °C : 334 J/g and the heat of vaporization at 100 °C : 2,230J/g

a. melting

[tex]\tt Q=100.334=33400~J[/tex]

b. freezing

[tex]\tt Q=100.334=33400~J[/tex]

c.raise the temperature(c water = 4.18 J/g C)

[tex]\tt Q=100\times 4.18\times (20-10)=4180~J[/tex]

The element Ar classified as noble gas in the periodic table. Therefore, the correct option is option A.

The noble gases are a group of chemical elements that share several characteristics. They are all monatomic, odourless, and colourless gases with relatively little chemical reactivity under normal conditions. Oganesson (Og) is a highly radioactive element created synthetically.

Although the IUPAC has included oganesson since "group 18" and "noble gas" have been used interchangeably, oganesson may not be appreciably chemically noble and therefore is projected to deviate from the norm and just be reactive owing to relativistic effects. Its chemistry is still being studied due to the exceptionally short 0.7 ms ½ of its sole known isotope. The element Ar classified as noble gas in the periodic table.

Therefore, the correct option is option A.

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Answer:

2 8 18 8 those are the ones I believe.

Answer:

Lol

Explanation:

lol

nah

Answer:

5.89× 10²³ atoms of Ca

Explanation:

Given data:

Mass of Ca = 39.2 g

Number of atoms = ?

Solution:

Number of moles of Ca:

Number of moles = mass/molar mass

Number of moles = 39.2 g/40.078 g/mol

Number of moles = 0.978 mol

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ atoms

0.978 mol ×  6.022 × 10²³ atoms / 1 mol

5.89× 10²³ atoms of Ca

Answer:

methyl ethyl ketone

Explanation:

(MEK)

Answer:0.86

Explanation:

?

We can use the equation:

volume = weight / density

volume = [tex](7.5425 g) / (8.8 g/cm3) = 0.8585 cm3[/tex]

The volume of the sample is 0.8585 [tex]cm^{2}[/tex], with three significant figures.

Volume is a measure of the amount of space that an object occupies, or the capacity of a container. It is typically measured in units of length cubed, such as cubic meters (m3), cubic centimeters (cm3), or cubic inches (in3).

Volume is an important concept in physics and engineering, as it is used to describe the size and capacity of objects and containers. It is also used in many everyday applications, such as measuring the volume of a liquid in a bottle or the volume of a box or suitcase.

The volume of an object or container can be calculated by multiplying its length, width, and height (if it has a regular shape) or by using more complex mathematical formulas if it has an irregular shape. The volume of a solid object is often expressed in terms of its density, which is the mass of the object per unit of volume.

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The rate of disappearance of chlorine gas : 0.2 mol/dm³

The reaction rate (v) shows the change in the concentration of the substance (changes in addition to concentrations for reaction products or changes in concentration reduction for reactants) per unit time.

For reaction :

[tex]\tt aA+bB\rightarrow cC+dD[/tex]

The rate reaction :

[tex]\tt -\dfrac{1}{a}\dfrac{d[-A]}{dt}= -\dfrac{1}{b}\dfrac{d[-B]}{dt}=\dfrac{1}{c}\dfrac{d[C]}{dt}=\dfrac{1}{d}\dfrac{d[D]}{dt}[/tex]

Reaction for formation CCl₄ :

CH₄+4Cl₂⇒CCl₄+4HCl

From equation, rate of reaction = rate of formation CCl₄ = 0.05 mol/dm³

Rate of formation of  CCl₄  = reaction rate x coefficient of  CCCl₄

0.05 mol/dm³ = reaction rate x 1⇒reaction rate = 0.05 mol/dm³

The rate of disappearance of chlorine gas (Cl₂) :

Rate of disappearance of  Cl₂  = reaction rate x coefficient of  Cl₂

Rate of disappearance of  Cl₂ = 0.05 x 4 = 0.2 mol/dm³

Answer: The molecular formula will be [tex]C_6H_6O_6[/tex]

Explanation:

Mass of [tex]CO_2[/tex] = 17.95 g

Mass of [tex]H_2O[/tex]= 4.87 g

Molar mass of carbon dioxide = 44 g/mol

Molar mass of water = 18 g/mol

For calculating the mass of carbon:

In 44g of carbon dioxide, 12 g of carbon is contained.

So, in 17.95 g of carbon dioxide, =[tex]\frac{12}{44}\times 17.95=4.89g[/tex] of carbon will be contained.

For calculating the mass of hydrogen:

In 18g of water, 2 g of hydrogen is contained.

So, in 4.87 g of water, =[tex]\frac{2}{18}\times 4.87=0.541g[/tex] of hydrogen will be contained.

Mass of oxygen in the compound = (12.00) - (4.89+0.541) = 6.57 g

Mass of C = 4.89 g

Mass of H =  0.541 g

Mass of O = 6.57 g

Step 1 : convert given masses into moles.

Moles of C =[tex] \frac{\text{ given mass of C}}{\text{ molar mass of C}}= \frac{4.89g}{12g/mole}=0.407moles[/tex]

Moles of H=[tex]\frac{\text{ given mass of H}}{\text{ molar mass of H}}= \frac{0.541g}{1g/mole}=0.541moles[/tex]

Moles of O=[tex]\frac{\text{ given mass of O}}{\text{ molar mass of O}}= \frac{6.57g}{16g/mole}=0.410moles[/tex]

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For C =[tex]\frac{0.407}{0.407}=1[/tex]

For H =[tex]\frac{0.541}{0.407}=1[/tex]

For O = [tex]\frac{0.410}{0.407}=1[/tex]

The ratio of C : H : O = 1: 1  : 1

Hence the empirical formula is [tex]CHO[/tex].

Hence the empirical formula is [tex]CHO[/tex]

The empirical weight of [tex]CHO[/tex] = 1(12)+1(1)+1(16)= 29 g.

If 0.25 moles has mass of 44.0 g

Thus 1 mole has mass of = [tex]\frac{44.0}{0.25}\times 1=176g[/tex]

Thus molecular mass is 176 g

Now we have to calculate the molecular formula.

[tex]n=\frac{\text{Molecular weight }}{\text{Equivalent weight}}=\frac{176g}{29g}=6[/tex]

The molecular formula will be=[tex]6\times CHO=C_6H_6O_6[/tex]

Explanation:

The reaction forms calcium hydroxide, Ca(OH)2 and hydrogen gas (H2). The calcium metal sinks in water and after an hour or so bubbles of hydrogen are evident, stuck to the surface of the metal.

Answer: B) calcium hydride + water -> calcium hydroxide + hydrogen

Explanation: B) on EDG

Moles of Nitrogen(N₂) gas would be produced : 1.09

The reaction coefficient in a chemical equation shows the mole ratio of the components of the reactants and products

If one mole of the reactant or product is known, then we can determine the moles of the other compounds involved in the reaction

Reaction

2NH₃(g) + 3CuO (s) ⇒ 3Cu(s) + N₂(g) + 3 H₂O(g)​

Copper(II) oxide was reacted with excess Ammonia, so CuO as a limiting reactant and moles of the product is based on moles of CuO

moles of CuO = 3.27

From the equation, the mol ratio of CuO : mol N₂ = 3 : 1, so mol  N₂ :

[tex]\tt \dfrac{1}{3}\times 3.27=1.09[/tex]