Chemistry High School

How many protons does silicon have?

28
2
14
28.08

How Many Protons Does Silicon Have?2821428.08

Answers

Answer 1

Answer:

14

Explanation:

Related Questions

A gas has a volume of 275 mL and a pressure of 3 atm. What is the new volume if the pressure decreases to 1.8 atm?

Answers

Answer:

Use Boyles law.

Given:

P1=3atm

V1=275mL

P2=1.8atm

V2=?

P1V1=P2V2

3x275=1.8xV2

V2=3x275/1.8

V2=458.3mL

1. What amount of ammonia (in moles) is produced by the reaction of 4.00 mol H2 with 3.00 mol Nz?
3 H2(g) + N2(g) → 2 NH3(g)

Answers

Answer:  6 moles

Explanation:

3 H₂    +    N₂   →   2 NH₃

   ↓            ↓

4 mol       3 mol

Since the moles of N₂ is the smaller of the two reactants, then N₂ is the limiting factor (the reactant that will decide how much ammonia is produced since it has the smaller amount of moles). ∴ we have to use it in calculating the number of moles of ammonia

The mole ratio of N₂ to NH₃ based on the balanced equation is 1 to 2.

∴ the moles of NH₃ = moles of N₂ × 2

                                =  3 moles × 2

                                = 6 moles

Que relación tiene el metabolismo celular con el mantenimiento de los seres vivos

Answers

El metabolismo es un proceso por el cual los seres vivos ganan masa y energía que ofrece el medio en el que viven y sirve para el mantenimiento, crecimiento y reproducción de estos.

Si tomamos en cuenta la clasificación de los seres vivos tenemos:

- Autótrofos: Crean su propio alimento por medio del sol o la tierra y no de otros seres vivos (plantas, vegetales y algas).

- Heterótrofos: Generan su propio alimento y dependen de los autótrofos o de otros heterótrofos para su alimentación (animales y algunas bacterias).

El metabolismo se divide en dos procesos conjugados, el catabolismo y el anabolismo. Estos procesos dependen el uno del otro.

Las reacciones catabólicas liberan energía, mientras que las reacciones anabólicas, utilizan esa energía liberada para recomponer enlaces químicos y construir componentes de las células como las proteínas y los ácidos nucleicos..

De esta manera se relacionan ambos

29. Which type of orbital is shown?

Z

Y

Х

Answers

Answer:

b

Explanation:


What type of reaction is represented by the chemical equation shown
below?
2PbO2 → 2PbO + O2

decomposition
single replacement
synthesis
deouble replacement

Answers

Answer:

Decomposition reaction

Explanation:

2PbO2 → 2PbO + O2

2PbO2 is reactant.

2PbO + O2 is the product.

Definition : -

Decomposition reaction is a chemical reaction in which a single reactant breaks down to simpler products.

Using the formula velocity = distance/time, how fast does sound travel in air at 20 degrees C given a distance of 500 m and 3.92 seconds.

A- 3.92
B- 127 m/s
C- 2,941 m/s
D- 746 m/s

Answers

Answer:

B : 127m/s

Explanation:

= 500 ÷ 3.92

= 127.5

Someone pls help me I will make you brain

Answers

I think it's true look at the picture

Answer:

false, true and i dk what the other answer choices are for the 3rd questions

Explanation:

Select the correct answer.
Which is true with respect to the kinetic energy of a molecule?
ОА.
it is the lowest at low temperatures
OB.
it increases at low temperatures
Oc it is the same at all temperatures
OD. it is the lowest at high temperatures

Answers

Answer is A. It is the lowest at low temperature

how many sodium ions are designated as bound?

Answers

Answer:

3

Explanation:

3

which method is used to separate salt form salt solution

Answers

Explanation:

As we know, salt and water have different boiling points. Hence, we can use the "evaporation" technique to separate salt from salt solution. For this, one has to simply heat the salt solution till all the water boils and evaporates, and salt is left behind.

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Which pair of elements has reactivity that is similar to Fluorine, F?

Answers

Answer:

halogens group 7A on the periodic

table

.
Which of the following describes Pluto?
1. asteroid
2. moon
3. planet
4. dwarf planet

Answers

Answer:

4. dwarf planet

Explanation:

The answer is a dwarf planet.

which is the largest atom in group IV?

Answers

Answer:

A

Explanation:

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Select all the statements that are TRUE about igneous rocks:

Answers

Answer:

Intrusive rocks are formed by slow cooling lava/magma.

Igneous rocks are always formed from lava/magma.

Explanation:

Someone pls help me I will make you brain

Answers

Answer:

A

Explanation:

how would the rate of diffusion change if the po2 in the capillaries was 40 mmhg and the po2 in the muscle cell changed from 40 to 20 mmhg?

Answers

The rate of diffusion change would increase if the PO₂ in the capillaries was 40 mmHg and the PO₂ in the muscle cell changed from 40 to 20 mmHg.

Simple diffusion is the movement of molecular substances from a region of higher concentration to lower concentration. The mechanism with which the movement of O₂ travels from the blood to the body tissues takes place with the use of simple diffusion.

Now, if PO₂ changes from 40 → 20 mmHg in the muscle cells, and the PO₂ in the blood = 40mmHg. It implies that the pressure gradient(P) has increased. As such, there is an increase in the rate of diffusion of oxygen from the blood to muscle cells.

Learn more about diffusion here:

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Which substance can not be broken down by a chemical change?

Answers

Answer:

Among the given substances, the one that cannot be broken down by a chemical change is arsenic.

Explanation:

Rawr

Answer:

the substances that cannot be broken down by a chemical change is arsenic.

CAN SOMEONE HELP IT WOULD MEAN THE MOST??!!!

Answers

Where’s the question bro??

what happens when chocolate get heated?

Answers

well the chocolate will be melt

hope it helps

In which biome would you most likely find largemouth bass, rainbow trout, and
salmon?
A Tundra
B Deciduous forest
C Freshwater
D Marine

Answers

Answer:

C

Explanation:

Fresh water fish need freshwater.

How many moles of Oz would be required to generate 13.0 mol of NO2
in the reaction below assuming the reaction has only 74.1% yield?
2 NO (g) + O2 (g) → 2 NO2 (g)

Answers

Answer:32

Explanation:

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What makes a charged object attract an uncharged object?

The charge in both objects move around.

The charged object is positively charged.

The charges move in the uncharged object.

The uncharged object becomes negatively charged.

Answers

Answer:

its c I think C)

 

The reason for this is due to the phenomenon called "Charging by Induction". What that means is that when something with a charge, for example a negative charge, is brought near an uncharged one, it induces the opposite charge onto it (positive in this case) and therefore since opposites attract, it attracts it.

The reason for this is that since, just like a positive magnet rejects and pushed away like charges, the electrons hold a negative charge, they push away any electrons that may be in the neutrally charged item causing only protons to be left, thus creating an oppositely charged object. Or vice versa.

So whatever charge the object has, it induces the opposite charge into the uncharged object, causing the charges to move only in the uncharged one.

Explanation:

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Answers

Answer:

sup brö how is it back home?

Explanation:

just curious you know

a change in the composition of matter _____________ occurs during a chemical reaction.

Answers

Answer: During a chemical change, the composition of matter always changes

Explanation:

What would cause a liquid to turn into a solid?

Answers

Answer:

Freezing the liquid

Explanation:

Freezing a liquid causes a liquid to become a soild.

Answer:

changing the temperature of the liquid

Explanation:

Ex. Cooking brownie batter(liquid), turns it into an edible brownie(solid). Ex. Putting water into a freezer freezes it, turning it into a solid.

only_________are involved in forming chemical bonds betwen two atoms
a. s orbital electrons
b. p orbital electrons
c. valence electrons
d. innermost electrons

Answers

Answer:

c. valence electrons

Explanation:

write a general equation for the reaction of an alkali metal with water.

Answers

Answer:

Alkali metals are highly reactive metals. These metals are that much reactive that they can even explode in the air as well. When alkali metals and water react with each other, there is a formation of metal hydroxide and the evolution of hydrogen gas.

The general representation of metal is A. so, the general equation for the reaction of an alkali metal with water is given below.

2A(solid)+2H2O(liquid) -------> 2AOH(aqeous)+H2(gas)

what is the main precaution to take if a gas cylinder sign is present in the lab?

Answers

Answer:

This symbol indicates that hazardous products with this pictogram are gases that are contained in a receptacle under pressure, or which are liquefied or liquefied and refrigerated. The hazards presented by these products are related to the high pressure or cold temperatures.

Hazardous products with this pictogram can be safely worked with if proper storage and handling practices are followed.

Credited to https://www.ccohs.ca/oshanswers/chemicals/howto/gas_cylinder.html#:~:text=The%20symbol%20within%20the%20pictogram%20is%20a%20gas,related%20to%20the%20high%20pressure%20or%20cold%20temperatures.

HAve a great day!

The main precaution to take if a gas cylinder sign is present in the lab is Check sure the gas cylinder remains constrained visually, but remain a good distance from it.

What is gas cylinder?

A gas cylinder is indeed a pressure vessel used to store and confine gases at pressures higher than atmospheric pressure. Bottles are another name for high-pressure gas cylinders.

Based on the physical properties of the contents, the held contents may be compressed gas, vapour over liquid, working fluid, as well as dissolved in a substratum inside the cylinder.  The main precaution to take if a gas cylinder sign is present in the lab is Check sure the gas cylinder remains constrained visually, but remain a good distance from it.

Therefore, the precaution is to Check sure the gas cylinder remains constrained visually, but remain a good distance from it.

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?C6H6+O2 coefficient​

Answers

Answer:

2C6H6

Explanation:

C6H6 + O2 = CO2 + H2

2C6H6 + 15O2 → 12CO2 + 6H2O

what is the empirical formula of a compound that consists of 0.039 moles of iron atoms combined with 0.052 moles of oxygen atoms?

Answers

Answer:

Fe3O4

Hope this helps :))

The empirical formula of a compound that consists of 0.039 moles of iron atoms combined with 0.052 moles of oxygen atoms is FeO[tex]\rmFeO_{2}[/tex].

What is  empirical formula?

The simplest whole number ratio of atoms in a compound is the empirical formula of a chemical compound in chemistry. Sulfur monoxide's empirical formula, SO, and disulfur dioxide's empirical formula are two straightforward examples of this idea.

The simplest whole number ratio of each type of atom in a compound is its empirical formula. It can be determined from data on the mass of each component in a compound or from the composition's proportion.

calculation:

Fe = 56/0.039 = 150

O = 16/0.052 = 300

in simplest term ratio is 1:2

Thus, empirical formula is FeO[tex]\rmFeO_{2}[/tex].

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