What is the proper value for D in the above table.
A. 65
B. 35
C. 30
D. 63

Answer: Positive

Explanation: Just a guess

Answer:

Positive

Explanation:

Solution :

Given :

length of silver cube = 2.28 cm

length of gold cube = 2.75 cm

Initial temperature = 82.8°C

Volume of silver cube is

Volume [tex]$=(\text{edge length})^3$[/tex]

               =    [tex]$(2.28)^3$[/tex]

                [tex]$= 11.8 \ cm^3$[/tex]

mass of silver cube

Mass, [tex]$m_s = \text{density} \times \text{volume} $[/tex]

                = 10.5 x 11.8

                = 123.9 g

Similarly, the volume of gold cube is

Volume [tex]$=(\text{edge length})^3$[/tex]

               =    [tex]$(2.75)^3$[/tex]

                [tex]$= 20.79 \ cm^3$[/tex]

mass of gold cube

Mass, [tex]$m_g = \text{density} \times \text{volume}$[/tex]

                = 19.3 x 20.79

                = 401.247 g

Now

heat lost by silver and gold cube = heat gained by water

∴[tex]$m_g .c_g \Delta T + m_s .c_s \Delta T = m_w.c_w \Delta T$[/tex]

[tex]$m_g .c_g (82.8- T) + m_s .c_s (82.8- T) = m_w.c_w (T - 20.2)$[/tex]

[tex]$401.247 \times 0.1264 (82.8- T) + 123.9 \times 0.2386 (82.8- T) = 111.5 \times 4.184 (T - 20.2)$[/tex]

Now solving the equation

[tex]$50.71 (82.8- T) + 29.56 (82.8- T) = 466.51 (T - 20.2)$[/tex]

Final temperature, T = 31.27°C

Science affected our lives at the beginning of this pandemic.

Explanation:

Although scientists did study the virus to see how deadly it is the pandemic kept spreading. The spreading of the virus was not the scientist's fault it was the citizens' fault. They now found a vaccine that took hard work and a short amount of time.

Answer: Inorganic chemistry

Explanation:

Inorganic chemistry can be defined as the branch of chemistry which studies the behavior of the inorganic compounds. Inorganic compounds are those compounds which lack carbon hydrogen bonding. The carbon monoxide, carbon dioxide, sodium chloride and water are the examples of inorganic compounds. This branch also studies the effect of these chemical compounds on the living things. The water and salts are chemicals which regulate the chemical and physiological reactions in the body.

Answer: With power and energy, power is units of energy divided by time. The same difference as distance and velocity. The units of power are watts, the units of energy are joules.

Explanation:

abcdefghijklmnopqrstuvwxyzExplanation:abcdefghijklmnopqrstuvwxyz

Answer:

0.105 mol/dm³

Explanation:

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

Mass of MgCl₂ = 10 g

Volume of solution = 1 dm³

Concentration of MgCl₂ =?

Next, we shall determine the number of mole present in 10 g of MgCl₂. This can be obtained as follow:

Mass of MgCl₂ = 10 g

Molar mass of MgCl₂ = 24 + (2 ×35.5)

= 24 + 71

= 95 g/mol

Mole of MgCl₂ =?

Mole = mass /Molar mass

Mole of MgCl₂ = 10 / 95

Mole of MgCl₂ = 0.105 mole

Finally, we shall determine the concentration of MgCl₂. This can be obtained as follow:

Mole of MgCl₂ = 0.105 mole

Volume of solution = 1 dm³

Concentration of MgCl₂ =?

Concentration = mole / Volume

Concentration of MgCl₂ = 0.105 / 1

Concentration of MgCl₂ = 0.105 mol/dm³

Concentration is [tex]0.105\ mol/dm^{3}[/tex]

Given:-

Mass of MgCl₂ = 10 g

Volume of solution = [tex]1\ dm^{3}[/tex]

Concentration of MgCl₂ =?

[tex]Molar mass of MgCl_2 = 24 + (2\times35.5)\\= 24 + 71\\= 95 g/mol[/tex]

 Mole of MgCl₂ =?

The number of moles is calculated by the equation as follows:-

[tex]Mole = mass /Molar massMole of MgCl_2= 10 / 95Mole of MgCl_2 = 0.105 mole[/tex]  

Determine the concentration of [tex]MgCl_2[/tex] as follows:-

Mole of MgCl₂ = 0.105 mole

Volume of solution = 1 dm³

Concentration of MgCl₂ =?

[tex]Concentration = mole / Volume\\Concentration\ of\ MgCl_2 = 0.105 / 1\\Concentration \ of\ MgCl_2= 0.105 mol/dm^{3}[/tex]

Hence the concentration of 10g of magnesium chloride is [tex]0.105 mol/dm^{3}[/tex].

To know more about:-

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Answer:

I think A does because there are so many letters in their so a

Answer:

second law

Explanation:

Answer:

C

Explanation:

A p orbital has the approximate shape of a pair of lobes on opposite sides of the nucleus.

Explanation:

A p orbital would have a du-bbell shape.

Options A and B show a spherical shape, which are for s orbitals.

Option D shows a double du-bbell / clover leaf shape, which is for d orbitals.

The answer is Option C.

P.S. The word is censored apparently, so be forgiving! Thanks~

x CO₂  = 0.236

x H₂  = 0.764

Given

P CO₂ = 217 mmHg

P H₂ = 703 mmHg

Required

The mole fraction

Solution

Dalton's law :

The total pressure of a mixture of gases is equal to the sum of the partial pressures of the component gases  

Can be formulated:  

P tot = P1 + P2 + P3 ....  

P tot for the mixture :

= 217 mmHg + 703 mmHg

= 920 mmHg

Mole fraction of each gas :

x CO₂ = 217 mmHg/920 mmHg = 0.236

x H₂ = 703 mmHg/920 mmHg = 0.764

Answer:

0.81mole

Explanation:

Given:

Volume of carbon monoxide  = 18dm³

Unknown

Number of moles of carbon monoxide  = ?

Solution:

To solve this problem;

           1 mole of any gas at rtp occupies a volume of 22.4dm³  

So;

           x mole of carbon monoxide will occupy a volume of 18dm³ at rtp

        22.4x  = 18

                x  = [tex]\frac{18}{22.4}[/tex]   = 0.81mole

Answer:

 2Li   +   F₂    →    2LiF

Explanation:

The reaction expression is given as:

          Li   +   F₂    →     LiF

We are to balance the expression. In that case, the number of atoms on both sides of the expression must be the same.

 Let use a mathematical approach to solve this problem;

  Assign variables a,b and c as the coefficients that will balance the expression:

             aLi   +  bF₂    →     cLiF

Conserving Li: a  = c

                   F:  2b  = c

          let a = 1, c  = 1 and b  = [tex]\frac{1}{2}[/tex]  

  Multiply through by 2;

        a  = 2, b = 1 and c  = 2

               2Li   +   F₂    →    2LiF

Answer:

1.989 × 10^30 kg

Explanation:

Hope this helps! :3

☁️ Answer ☁️

A solar mass is the mass of the sun. Or, more precisely, it's 1.989 x 10^30 kilograms — about 333,000 Earths. Astronomers use a solar mass as a basic unit of mass.

Dear fool, you will always be a fool.

Happy April Fools Day.

Hope it helps.

Have a nice day noona/hyung

Answer:

D, last one.

Explanation:

In order to use solar energy, we need solar panels.  Which we need sun for it to heat up, and once there is the sun.  The heat can hit the water, and cause the water to burn/boil

Answer:

This strong current of warm water influences the climate of the east coast of Florida, keeping temperatures there warmer in the winter and cooler in the summer than the other southeastern states. Since the Gulf Stream also extends toward Europe, it warms western European countries as well.

Answer:

warm climates in northern Europe

Explanation:

I took the test in K12 and this was the answer :)

Answer:

2.24dm³

Explanation:

Given parameters:

Mass of He = 40g

Unknown:

Volume of Helium  = ?

Solution:

To solve this problem, we convert the given mass to number of moles.

   Number of moles  = [tex]\frac{mass}{molar mass}[/tex]  

   molar mass of He  = 4g/mol

  Number of moles  = [tex]\frac{4}{40}[/tex]   = 0.1mole

So;

                  1 mole of gas at rtp occupies a volume of 22.4dm³

                0.1 mole of He will occupy a volume of 0.1 x 22.4 = 2.24dm³

Answer:

D. All of the above

Explanation:

Elements are being grouped in the "Periodic Table" in order to associate them with other elements that have similar properties. These elements also have the same number of "valence electrons" or electrons located in the outer shell. The groups are then classified into their "family names." For example, Group 1 is named "Alkali metals" because the elements within it are very reactive and have high conductive property. The valance electron of the elements in this group is "1."

boiling waterAnswer:

Explanation:

its called thermal energy

Answer:Actinide Group

Explanation:Plutonium is a member of the actinide group in the periodic table. Plutonium atoms have 94 electrons and 94 protons with 2 valence electrons in the outer shell. There are 150 neutrons in the most abundant isotope.

Answer:

when sodium reacts with chlorine atoms, sodium will give an electron which is negative charged to chlorine.it makes sodium(+) and chlorine (-)..then sodium will attract chlorine to form sodium chloride(NaCl)

Answer: A. AB+C->CB+A

Explanation:

The chemical reaction includes the reactant and products. The single replacement reaction can be given as AB + C → CB + A. Thus option a is correct.

A single replacement reaction is the exchange reaction that involves the substitution of a single element of the reactant with another element of the reactant species.

The reaction between zinc and copper chloride is a single replacement reaction as copper is replaced by zinc in the copper chloride compound to produce zinc chloride and copper.

Therefore, option A. AB + C → CB + A is the single replacement reaction.

Learn more about single replacement reaction here:

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A scientist exploring evidence from other fields of science to support findings is an example of a scientist using creativity.

Creativity is a mental cognitive ability that involves the creation and/or discovery of a hidden process.

In science, creativity refers to the application of mental skills to create new experimental designs and extrapolate findings.

In conclusion, a scientist exploring evidence from other fields of science to support findings is an example of a scientist using creativity.

Learn more about creativity here:

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Answer:

bronze medal i guess

i hope its correct.

Explanation:

Answer:

silver spoon

Explanation:

i had this for castle learning and guessed this and it was right

Answer:

It makes chemicals hot or cold which makes chemicals react differently

Explanation:

mark me brainliest

Answer:

2KOH + 3co2 ------->2ксоз + 2Н20

(NH₄)₂S

%N=  41.18%

%H =11.76%

%S=47.06%

Mg(NO₃)₂

%Mg=32.43%

%N=18.92%

%O=(64.86%

Given

(NH₄)₂S

Mg(NO₃)₂

Required

The percent composition

Solution

(NH₄)₂S MW=68 g/mol

%N=2. Ar N  / MW (NH₄)₂S x 100%

%N= (2.14/68) x 100% = 41.18%

%H =(8.1/68) x 100%=11.76%

%S=(32/68)x 100%=47.06%

Mg(NO₃)₂ MW=148 g/mol

%Mg=(2.24/148)x100%=32.43%

%N=(2.14/148)x100%=18.92%

%O=(6.16/148)x100%=64.86%