the melting point of gallium metal is 29.76°C If a piece of gallium is sliced into three parts, the melting point will be:

A. higher than 29.76°C
B. 29.76°C
C. lower than 29.76°C

​

Answer:

4Na  +   O₂  →   2Na₂O  

6.82g

Explanation:

The combustion of sodium involves combining the element with oxygen gas:

              4Na  +   O₂  →   2Na₂O  

We have been given 5g of Na.

The balanced reaction equation is given as shown above. This reaction is also a synthesis or combination reaction.

b. Maximum amount of product that can be obtained.

Sodium is the limiting reactant and it will determine the amount of product that can be formed.

  To solve this, we find the number of moles of the given sodium.

  Mass of given sodium  = 5g

    Molar mass of Na  = 23g/mol

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

Insert the parameters and solve;

 Number of moles of Na  = [tex]\frac{5}{23}[/tex]    = 0.217moles

  From the balanced reaction equation:

         4 moles of Na will produce 2 moles of Na₂O  

      0.217 moles of Na will produce [tex]\frac{0.217 x 2}{4}[/tex]   = 0.11mole of Na₂O  

So;

 Mass of Na₂O   = number of moles x molar mass

    Molar mass of Na₂O   = 2(23) + 16  = 62g/mol

 Mass of Na₂O   = 0.11 x 62  = 6.82g

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:

The respiratory system

Explanation:

Answer:

The diaphragm belongs to the respiratory system, digestive system, and muscular system.

I'm not too sure on the muscular system, but the other two 100%

Explanation:

Hopefully, this helps. :)

Answer:

D.the metal atom use their positive charges to gain additional electrons until every atom has eight valence electrons.

The statement which best describes the metallic bonding is (B). The valence electrons between the metals become decoalized and can move freely between the metallic cations.Hence the correct option is (B).

Chemical bonds known as metallic bonds are produced by the electrostatic attraction of positively charged metal ions and conduction electrons.

A structure of positively charged ions may be thought of as sharing free electrons.

Atoms in a metallic substance are held together by a force called the metallic bond. Atoms in such a solid are packed closely together. Each metal atom's outermost electron shell typically overlaps with a significant number of its nearby neighbors.

Therefore, The statement which best describes the metallic bonding is (B). The valence electrons between the metals become decoalized and can move freely between the metallic cations.Hence the correct option is (B).

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Answer:

Indium

Explanation:

That is Indium (In) which is in same group as Al

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:

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

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 :)

0.342 mol Ca

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

13.7 g Ca

Step 2: Identify Conversions

Molar Mass of Ca - 40.08 g/mol

Step 3: Convert

Step 4: Check

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

0.341816 mol Ca ≈ 0.342 mol Ca

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:

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].

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Answer:

FLUORINE

The most reactive nonmetal is fluorine. Fluorine is a halogen, which is Group 17 on the periodic table, and the halogens are the most reactive nonmetals. This is because they all have one empty space in their valence electron shells.

Explanation:

Answer: please make the question more understandable

Explanation:

they are found on the crust

Answer:

crust

Explanation:

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:

June 20

Explanation:

Answer:

90 minutes

Explanation:

The half life of a first order reaction is;

t1/2 = ln(2) / k

To solve for t;

The integral rate expression for a first order reaction is;

ln[A] = ln[Ao] - kt

t = 60 minutes

Final Concentration = [A] = 100 - 37 = 63

Initial Concentration = [Ao] = 100

ln(63) = ln(100) - k (60)

k (60) = ln (100) - ln(63)

k = 0.4620 / 60 = 0.0077

Inserting the value of k in the half life equatin;

t1/2 = ln(2) / 0.0077 = 90 minutes

Answer:

Answer choice c  = 174

Explanation:

If you divide 30% into 580 you get 174. You can also check your work by doing 580 divided by 70%

30% divided by 580 = 174

Answer:

This one seems tricky, but the answer is B.

Explanation:

The first answer choice is wrong because it only applies to volcanic mountains.

C. would be true for folded mountains and volcanic mountains, but not fault-block mountains. Fault-block mountains have steep slopes and jagged surfaces; hence why B is correct.

D. is wrong because it applies to all three types of mountains mentioned.

Really, volcanic mountains can have gentle slopes and steep slopes, as well as jagged appearances and dome-shaped appearances. All that has to be assessed is the characteristics of fault-block mountains. This would be described in answer choice B.

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. 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."

Answer:

The difference in potential energy between the reactants and products

Explanation:

The difference in potential energy between the reactants and products reveals the enthalpy of reaction, hence option B is correct.

The change in the enthalpy of a chemical reaction that takes place at constant pressure is known as the heat of reaction also known as the enthalpy of reaction. It is a unit of measurement for thermodynamics.

In a thermodynamic system, energy is measured by enthalpy. Enthalpy is a measure of a system's overall heat content and is equal to the system's internal energy plus the sum of its volume and pressure.

The difference between  total product and total reactant molar enthalpies, computed for substances in their standard states, is the standard enthalpy of reaction for a chemical reaction.

Therefore, the difference in potential energy between the reactants and products reveals the enthalpy of reaction, hence option B is correct.

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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~

Answer:

second law

Explanation:

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