I have nothing to say hear look at picture sorry

Answer:

10

Explanation:

Atomic number = No. of protons

Therefore, the number of protons of an element with an atomic number of 10, is also 10.

Answer:

Microwaves are best suited because

they have a higher frequency and small wavelength

Satellite communication and Earth observation from space benefit from microwaves that can pass through haze, light rain, snow, clouds, and smoke. Because they can penetrate the atmosphere, microwaves are used. Small wavelength and high frequency is employed for this.

Microwaves are radio waves with short wavelengths and frequencies in the gigahertz (GHz) range. They can send signals over great distances without any data loss thanks to their high frequency. Without producing signal overlap or interference, they may carry a wide range of frequencies.

Electromagnetic radiations include radio waves and microwaves. In communication, both are utilized. Television and radio programs are transmitted by radio waves, but mobile phones and Wi-Fi use microwaves. Radio waves are one of the several alternatives for satellite communication.

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Answer:

di ko maintindihan anggulo ng isinulat

Answer:

They both contain chemical energy, which people and cars convert into mechanical energy.

Explanation:

Answer:

B)They both contain chemical energy, which people and cars convert into electrical energy.

Explanation:

The number of units of aluminum chloride (AlCl₃) that can be produced from 30 atoms of aluminum (Al) is 30 units

The balanced equation for the reaction is given below:

2Al + 3Cl₂ — > 2AlCl₃

From the balanced equation above,

2 atoms of Al reacted to produce 2 units of AlCl₃.

With the above information, we can determine the number of units of AlCl₃ that can be produced by the reaction of 30 atoms of Al. This can be obtained as follow:

From the balanced equation above,

2 atoms of Al reacted to produce 2 units of AlCl₃.

Therefore,

30 atoms of Al will also react to produce 30 units of AlCl₃.

Thus, 30 units of AlCl₃ were obtained from the reaction.

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Answer:

It would contain 10.

Explanation:

The atomic number: the number of protons.

It is appropriate to form double or triple bonds in a Lewis structure when four or six electrons are shared.

A Lewis structure is a representation of a molecule using dots to show the valence electrons in the molecule. This dots are shown around the symbols of the elements.

However, in instances where four or six electrons are shared between bonding atoms, a double or triple bond is used. A double bond means that four electrons are shared. A triple bond means that six electrons are shared.

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Explanation:

The nomenclature of ionic compounds is given by:

1. Positive is written first.  And if the metal atom has various oxidation states then its oxidation state is to be mentioned in brackets with help of roman numbers

2. The negative ion is written next and a suffix is added at the end of the negative ion. The suffix written is '-ide'.

1.)  : Calcium chloride  (Correct)

In the given compound, calcium has oxidation state of +2 and chlorine has oxidation state of -1.The name is correct.

2.)  : Copper (II) oxide   (Incorrect)

In the given compound,copper has the oxidation state of +1 and oxygen has oxidation state of -2.So ,the correct name will be Copper (I) oxide.

3.)  : Lead (II) sulfide   (Incorrect)

In the given compound, lead has the oxidation state of +4 and sulfur has oxidation state of -2. So ,the correct name will be Lead (IV) sulfide.

Answer: Matter cannot be created or destroyed in chemical reactions.

Explanation: This is the law of conservation of mass. In every chemical reaction, the same mass of matter must end up in the products as started in the reactants. Balanced chemical equations show that mass is conserved in chemical reactions.

Answer:

I believe it is B

Explanation:

I am on this lesson too :)

Answer:

III  Electropositivity increases down the group

Explanation:

Answer:

A

Explanation:

Answer:

Iron is magnetic and Salt is non magnetic

So Salt dissolves in water and Iron doesn't

Answer:

Your answer should be B.) C, Si, Ge, Sn! I hope this helps you! :)

Answer:

Water :H2O

Carbon dioxide :CO2

Oxygen :O2

Glocuse :C6H12O6

Answer:

water = H20

carbon dioxide = CO2

oxygen = 02

glucose= C6H1206

Explanation:

Answer:

the law of multiple proportions, law of definite proportions, and law of conservation of mass.

Explanation:

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Answer:

Elements in the same group has different physical properties such as boiling and melting points. However there are trends of their physical properties down the group.

Explanation:

You should look at the perdoic table to for extra help

The boiling points and melting points of the given elements does not support the claim that elements of the same group have similar physical properties.

The boiling point of a substance is the temperature at which it changes from liquid state to gaseous state. Melting point is the temperature at which the substance changes from solid to liquid state.

Elements in the same group shows similar physical and chemical properties. But from the boiling and melting point we cant say that they are in the same group.

Elements in a group shows a trend in boiling point and melting point but cannot be distinguished with this from other groups.

Hence, boiling point and melting point of the elements do no support for the similar properties in a group.

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Your question is incomplete, but most probably your full question was,

Do the boiling points and melting points of these elements support the claim that elements of the same group have similar physical characteristics? (image uploaded)

Answer:

ano pong topik po yan

Answer:

A) Refraction , this is the correct answer.

Hope it helps!!

Answer:

A refraction. I'm an electrician building aspects they put circular cones through the building and where they bend they have refractors and so you can have a completely closed off building and the light will come through from the rooftops through these tubes and the light been through refractors to make it look like you have a moonroof

Answer:

Group 0

Explanation:

A cheerful teen willing to help,

stay salty,

stay positive...

The group zero of the periodic table is composed of inert gases.They are very unreactive So, they don't form molecules easily and are found as single atoms.

"Noble metals, such as gold, platinum, silver, and a few rare metals. Members of this class have little or no tendency to unite with oxygen in the free state and do not change composition when placed in water at a red heat.

Noble gas atoms already have complete outer shells and have no tendency to lose, gain, or share electrons. As a result, noble gases are inert and do not participate in chemical reactions.

Because their outermost shells are completely filled, zero group elements are inert. They have no tendency to lose, gain, or share electrons with other elements.

Thus, The group zero of the periodic table is composed of inert gases because they are unreactive.

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The molarity of an HCl solution if 50.0 ml is neutralized in a titration by 40.0 ml of 0.400M NaOH is 0.320 M.

HOW TO CALCULATE MOLARITY:

M1V1 = M2V2

Where;

According to this question,

M1 × 50 = 0.400 × 40

50M1 = 16

M1 = 16 ÷ 50

M1 = 0.32M

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Answer:

anyone you just have to know how

Explanation:

Taking into account the definition of calorimetry, the correct answer is the third option:  The heat exchanged is 10,450 J.

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).

The amount of heat (Q) necessary to vary the temperature of a mass (m) of a substance is proportional to the change in its temperature (∆T) and to that mass. So, the equation that allows calculating heat exchanges is:

Q = c× m× ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case, you know:

Replacing in the expresion for calorimetry:

Q = 4.18[tex]\frac{J}{gC}[/tex]× 100 g× 25 C

Solving:

Q= 10,450 J

Finally, the correct answer is the third option:  The heat exchanged is 10,450 J.

Learn more:

Answer:

second one is better

Explanation:

system is very much hot in first state..so wait for cooling down the system..but these depend on the organic compounds and products you are using. sometimes we need to carryout further steps in hot state..then you can't wail it to cool down

Answer:

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