Mercury is a liquid at room temperature, gallium will melt if held in your hand, and aluminum is a solid that has a high melting point. All three are metals. How can you explain these observations using information about the strength of metallic bonds?

For Number 2)

THE ELEMENTS TEND TO FORM COMPOUNDS BECAUSE AOMS ARE UNSTABLE AND CAN SHARE ELECTRONS IN THIER OUTER ENERGY LEVELS .

AS WE KNOW, ATOMS OF AN ELEMENT BECOMES MORE STABLE BY LOSING , GAINING AND SHARING ELECTRONS.

Elements react with each other to complete their octet or duplet so as to become stavle in nature. For e.g. Carbon reacts with oxygen to form carbon dioxide. Carbon reacts with four molecules of hydrogen to form methane - CH4.

Answer:

lone pairs. pairs of valence electrons that are not involved in covalent bond formation, unshared pairs of electrons.

Explanation:

Answer:

CFC’s illustrate that technical advances can be a “double-edged” sword as CFC's were made for the advantages but soon or later it came as a disadvantage for environment.

CFC's was discovered with many advantages such as they are stable, non-corrosive, and replacement of harmful ammonia used in refrigerators  and air conditioning systems. But soon it is also discovered that CFC's are destroying  the upper atmosphere layer called ozone, which is a very big disadvantage for us. CFCs are major contributor  to global warming after carbon dioxide.

Hence, it proves that CFC’s shows how technological advancement can be “double-edged” sword.

Answer:

A: Add a substance to the wash that reduces the number of charges transferred.

Explanation:

The attraction between opposite charges make the clothes attract together. To reduce them Increase the temperature of the air in the dryer to weaken the electric forces. Hence, option A is correct.

An electric dryer is used to dry the clothes and hair or other substances using electric current. A substance can have both negative and positive charges. The opposite charges will attract together while the negative charges repel.

By exposing clothes to electric dryer it will gain electrons from the dryer and the positive poles of the clothes will attracts it. The electric current from the dryer will make clothes temporarily polarised.

If temperature increases, the intermolecular force of attraction decreases by making the kinetic energy of molecules raised. Therefore by increasing the temperature of air from the dryer the attraction can be reduced.

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Answer:

The reaction combines the sodium with the hydrogen and oxygen in water to form sodium hydroxide and hydrogen gas, and you get a lot of energy released as heat as well. This heat actually melts any remaining sodium that has not reacted yet, and ignites the hydrogen gas, so you get the bang and the flash.

Explanation:

Answer:

14.85L of water are produced

Explanation:

Based on Avigadro's law, the volume is directly proportional to the moles of a gas.

Based on the equation:

2C₂H₆(g) + 7O₂(g) → 4CO₂(g) + 6H₂O(g)

2 moles of ethane produce 6 moles of H₂O.

Using Avogadro's law: 2L of ethane produce 6L of H₂O.

The addition of 4.95L of ethane are:

4.95L ethane * (6L H₂O / 2L C₂H₆) =

Explanation:

The equation of the reaction is given as;

12C + 16 H2 --> 4 C3H8

a. Simplify the equation;

The coefficients are 12, 16 and 4.

4 is a common factor, so divide all through by 4.

12/4 = 3, 16/4 = 4, 4/4 = 1

The equation is given as;

3 C + 4 H2 -->  C3H8

b. If 21 moles of  C3H8 are formed, how many moles of C was needed.

From the reaction;

3 mol C atoms reacts to form 1 mol of  C3H8

x mol would react to form 21 moles of  C3H8

3 = 1

x = 21

x = 21  * 3

x = 63 moles

If all the particles in a material are made up of

several smaller particles, and every larger particle

is identical, is the material a pure substance or

not? Explain your reasoning.

A pure substance is something like a compound and element. This material made of several particles which seem to be two different particles, I believe, is a mixture. So, it is not a pure substance mixtures are made up of more than one particle while compounds (In a fixed ratio, the fusion of two or more than two atoms) and elements are made up of one molecule essentially.

The given material is not a pure substance as it is made up of several smaller particles and some larger particles that are identical.

A pure substance is defined as a substance that has fixed chemical composition throughout the substance. A pure substance are not necessarily have to be of single substance or compound.

The given material is not a pure substance because it is made up of several different small particles. The material is made up of both small particle and large particles and both the particle do not have similar composition.

A pure substance is a homogeneous mixture. These substance has similar composition throughout the substance size of the particle  does not matter.

Thus, it is not a pure substance as it is made up of several smaller particles and some larger particles that are identical.

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Answer:

give it your all but know your limits

Explanation:

Answer:

Explanation:

The term change of phase means the same thing as the term change of state. ... i.e. during phase change, the energy supplied is used only to separate the molecules ; no part of it is used to increase the kinetic energy of the molecules. So its temperature will not rise, since kinetic energy of molecules remains the same.

Answer:

Explanation:

Magnetic fields can be measured in various ways. If this device, called a dip meter, is first aligned in the direction of the magnetic meridian as defined by a compass, the needle lines up with the total field vector and measures the inclination angle I

Answer 1- 233.07

Answer 2- 491.07

Answer 3 - 6.05

Answer 4 - 28.02

V₂=0.894 L

Given

V₁=1.55 L

T₁=27 + 273 = 300 K

P₁=1 atm

T₂=-100+273 = 173 K

Required

The final volume(V₂)

Solution

Charles's Law  

When the gas pressure is kept constant, the gas volume is proportional to the temperature  

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

Input the value :

V₂=V₁T₂/T₁

V₂=1.55 x 173/300

V₂=0.894 L

Answer:

Explanation:

It is balaned

Left side

1 Na

1 C

3 Os

1 H

=========

Right side

1 Na

1 H

1 C

3 Os

Answer:

CO2 + NaOH = NaHCO3 and the reaction type is synthesis ( this was already balanced)

Explanation:

I took out the  <> to get CO2 + NaOH = NaHCO3

CO2- molar mass= 44.0095

NaOH- molar mass= 39.99710928

NaHCO3- molar mass= 84.00660928

Answer:

B -1 and +7

Explanation:

Iodine shows oxidation states of −1, +1, +3, +5, or +7.

Answer:

Genetics is the scientific study of inherited variation. Human genetics, then, is the scientific study of inherited human variation.

Why study human genetics? One reason is simply an interest in better understanding ourselves. As a branch of genetics, human genetics concerns itself with what most of us consider to be the most interesting species on earth

Answer:

D. 1

Explanation:

Just took it :)

The element that would be found in Group 13 is

D. 1

The electron dot structure has three valence electrons.

Group-13 is also known as the Boron family. This group belongs to p-block elements. The elements of this group will have three electrons in their outermost shell i.e. 3 valence electrons.

Example: Boron has atomic number 5.

Electronic configuration of Boron: [tex]1s^2 2s^2 2p^1[/tex]

Thus, the electron dot structure for group-13 is option D i.e. 1.

Find more information about Group-13 elements here:

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Answer:

Explanation:

1 mol of any chemical is 6.02 * 10^23

x mol of any chemical is 6.31 * 10^24

You should look at this before you put it in  your calculator. You should think roughly 10.

Now you can set it up as a proportion

1/x = 6.02 * 10^23/6.31 * 10^24        Cross multiply

6.02 * 10^23 x = 1 * 6.31 * 10^24      Divide by 6.02 * 10^23

x = 6.31 * 10^24 / 6.02 * 10^23

x = 10.48 mols.

Answer:

m = 1 gram

Explanation:

Given that,

Heat, Q = 84 J

The temperature increases from 10°C to 30°C.

We need to find maximum number of grams of liquid water. We know that the heat required is given by :

[tex]Q=mc\Delta T[/tex]

c is specific heat of water, c = 4,200 J/kg°C

Use the above formula to find m. So,

[tex]m=\dfrac{Q}{c\Delta T}\\\\m=\dfrac{84}{4,200\times (30-10)}\\\\m=0.001\ kg[/tex]

or

m = 1 gram

So, the required mass is 1 gram.

Answer:

a. 10⁻² > 10⁻³

b. 10⁻¹⁴ < 10¹

c. 10⁻⁷ = 0.0000001

d. 100 > 10¹

Explanation:

We can rewrite those numbers as 0.01 and 0.001. That way the answer becomes clearer.

Any positive number with a negative exponent will be less than 1.

In the decimal, the 1 is exactly 6 zeros away from the dot, meaning the 1 is in the seventh place.

10¹ is equal to 10.

Answer:

You will more than likely fall or get pushed back a little

Explanation:

Answer

Depends on if you're good on a skateboard or not.

Explanation:

If you're good: Then you wont fall

If you're bad: Then you might fall

Can't tell if this is an actual school question or not, lol

But I hope it helps, :)

Answer:

The electromagnetic spectrum

Explanation:

ranges from gamma (γ) radiation, which has the shortest wavelength, highest frequency, and greatest energy