Q3. Which of the following elements is a noble gas?
A Argon
B Chlorine
C Potassium
D Bromine

Answer:

4.0625

Explanation:

1 grams Oxygen to mol = 0.0625 mol

0.0625 x 65 =4.0625

Answer:

what the other guy said

Explanation:

Answer:

i just feel rlly bad that you need it now, i cant help but all i can say is you got this mate

Answer:

15.547437000000029

Explanation:

Answer:

Zinc oxide is react with sulphuric acid to give zinc sulphate and water.

zinc oxide +sulphuric acid ⇒ zinc sulphate + water

Zno    +H2So4 ⇒ZnSo4 + H2O

SULPHURIC ACID = H2SO4

ZINC SULPHATE =ZnO

Explanation:

Answer:

6

Explanation:

This question is seeking for an equivalent of one expression. The first expression says 1/3 of 12, which means 1/3 × 12 = 4. To find 2/3 of a number that will give us 4, we say

Since; 1/3 of 12 is 4

Then, 4 = 2/3 of x, where x is the number, which when multiplied by two-third (2/3) will result to 4.

4 = 2/3 × x

4 = 2x/3

Cross multiply

2x = 3 × 4

2x = 12

x = 12/2

x = 6.

This means that; 1/3 of 12 = 2/3 of 6

Answer:

C) Orion spur.

The Orion Arm is a minor spiral arm of the Milky Way Galaxy that is 3,500 light-years across and approximately 10,000 light-years in length, containing the Solar System, including Earth.

Answer:

radio waves

Explanation:

which has the longest wavelength and lowest frequency and energy. Ultraviolet light (UV) is divided into three regions: UV A, wavelength = 400 - 320 nm UV B, wavelength = 320 - 280 nm

do the yoga boi TUT yooooooooooooooooooooo9ooooooooot

Answer:

Explanation:

You can't award 20 points once you have awarded 5.

One

2K + Cl2 ==> 2KCl

It's True

There are 2 Ks and Cl2 has 2 atoms making up on the left.

On the right, 1 molecule of KCl has 1 Potassium and 1 Cl. But there are 2 molecules so between the two of them, there's 2 Potassiums and 2 Cl

Two

The reactant side is the Left side. Cl2 means there are 2 Cl atoms making Cl2. Answer B

Three

False: There are 2 but read below.

I really don't know how to answer that. It's not qualified enough. There are a total of 2 Chlorines on the right hand side when there are 2 molecules. I think you are intended to answer False, but don't be surprised if you get it wrong.

Answer:

graphite

Explanation:

graphite is also good conductor of electricity

it was produced by a plant

Answer:

Mass in an isolated system can neither be destroyed nor created.

Explanation:

In a chemical reaction, mass can neither be created nor be destroyed.

Answer:

Adding more CO2 to the atmosphere will cause surface temperatures to continue to increase. However, more energy is absorbed in the weaker bands and in the wings of the strong band, causing the surface and lower atmosphere to warm further.

Answer:

yes

Explanation:

Na2CO3 + H2SO4 --> Na2SO4 + H2O + CO2

Answer:

Many metals (such as zinc, tin, lead, aluminium, and beryllium) form amphoteric oxides or hydroxides. Amphoterism depends on the oxidation states of the oxide. Al2O3 is an example of an amphoteric oxide.

Answer:

Lead (II) oxide and zinc (II) oxide

Answer:

0.059 moles are present in 2.6 g of CO₂

Explanation:

Molar mass is the mass of one mole of a substance, which can be an element or a compound. That is, it is the amount of mass that a substance contains in one mole.

In this case, the mass of each element being:

then the molar mass of the compound is:

CO₂=  12 g/mole + 2*16 g/mole= 44 g/mole

Then you can apply the following rule of three: if by definition of molar mass 44 grams of CO₂ are present in 1 mole, 2.6 grams will be present in how many moles?

[tex]amount of moles=\frac{2.6 grams*1 mole}{44 grams}[/tex]

amount of moles= 0.059 moles

0.059 moles are present in 2.6 g of CO₂

Answer: C something that improves an organisms ability to survive

Answer:

C.

Explanation:

Answer:

C) Bromine is produced

Explanation:

When iodine chemically reacts with potassium bromide then it will lead to the formation of potassium iodide and bromine. This reaction is actually a single displacement reaction in which bromine from potassium bromide is displaced by iodine atom.

When iodine solution is added to potassium bromide solution ,bromine is produced. It is an example of displacement reaction.

Displacement reactions are chemical reactions in which one element present in a compound is replaced by another element.The reaction generally takes place between a molecule and a compound.

During the reaction, the anion of compound is replaced by the molecule and the anion of the compound is transformed into a molecule.When iodine molecule in form of solution is reacted with solution of potassium bromide solution of potassium iodide is obtained.

During this reaction anion of potassium bromide that is bromine is replaced by iodine forming solution of potassium iodide and molecule of bromine is liberated in the form of gas.

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Answer:

Cancer is a disease caused when cells divide uncontrollably and spread into surrounding tissues.

Explanation:  Cancer is caused by changes to DNA. Most cancer-causing DNA changes occur in sections of DNA called genes. These changes are also called genetic changes.

-Hope this helped

Answer:

18.88 grams of Al2O3

Explanation:

Here's my work

10g Al    l    1 mol Al    l    1 mol Al2O3  l   102g Al2O3

             l    27g Al       l   2 mol Al         l    1 mol Al2O3

Balanced equation: 2Al +Fe2O3  --> Al2O3 + 2Fe

So pretend it's in a chart,  you fill it out starting from the top left corner and then moving diagonally down and then straight up and then diagonally down and the straight up, etc.  You start with 10 grams of Al, so the first thing you want to do is convert it into moles.   So you find the mass of Al(which is 27) and then you have 1 mol of Al on top.  So the next thing you have to do is to change it to Al2O3 since that is what the question is asking for.  This is where it's important you balanced the equation correctly because you're going to compare the mol ratios.  To do this, you have to look at the coefficients in front of Al, which is a 2.  so you write 2 mol Al on the second bottom section.  and then on top you look at the balanced equation again and look at the coefficient in front of Al2O3, which there is none so it's a 1.   Then all you have to do is convert back to grams because the question wants it in grams.  so you put 1 mol on the bottom and then you look at your periodic table to figure out the mass of Al2O3.    Al= 27,  O= 16.   (27x 2) +  (16 x 3)  = 102.     Finally you just multiply all the numbers on the top row and then multiple all the numbers on the bottom row and then divide what you get on the top by the bottom.  

Answer:

Percent mass of oreo = 35.11%

Explanation:

Given:

Mass of oreo =  17.1

Mass of 1st cookie = 16.2

Mass of 3rd cookie = 15.4

Find:

Percent mass of oreo

Computation:

Total mass = Mass of oreo + Mass of 1st cookie + Mass of 3rd cookie

Total mass = 17.1 + 16.2 + 15.4

Total mass = 48.7

Percent mass of oreo = [Mass of oreo/Total mass]100

Percent mass of oreo = [17.1 / 48.7]100

Percent mass of oreo = 35.11%

Answer:

50.6g Al would be needed

Explanation:

Based on the reaction:

4Al + 3O₂ → 2Al₂O₃

4 moles of aluminium react with 3 moles of oxygen to produce 2 moles of Al₂O₃

To solve this question we need to find the moles of 45g of O₂. Then using the chemical equation find the moles of Al and its mass:

Moles O₂ -Molar mass: 32g/mol-:

45g O₂ * (1mol / 32g) = 1.41 moles O₂

Moles Al:

1.41 moles O₂ * (4mol Al / 3mol O₂) = 1.875 moles Al

Mass Al -Molar mass: 26.98g/mol-:

1.875 moles Al * (26.98g / mol) =

50.6g Al would be needed

The amount of aluminum that would be required to completely react with 45 grams of O2 would be 50.59 grams.

From the balanced equation of the reaction:

[tex]4 Al + 3 O_2 ---> 2 Al_2O_3[/tex]

The mole ratio of Al to O2 is 4:3.

Mole of 45 grams of O2 = mass/molar mass

                                     = 45/32

                                           = 1.4063 moles

Equivalent mole of Al: 4 x 1.4063/3

                                    = 1.875 moles

mass of Al = mole x molar mass

                 = 1.875 x 26.98

                  = 50.59 grams

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Answer:

Aquatic plants have aur filled tissues to make them easy to float.....

Explanation:

It provides buoyancy

Answer:

(C3H4O3) x 2 = C6H8O6, the molecular formula for Vitamin C.

The best way for helping the earth water supply that should be last for future generations should be considered option b. where it decrease the residential water usage.

The average American family should be used for more than 300 gallons of the water per day at home. Approximately 70% of the use should arise indoors,

Moreover, outdoor water should be accounted for 30% of household that should be high in drier parts for the country and it should be more water intensive landscape.

Therefore, the option b is correct.

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Explanation:

Given chemical equation

Zn + HCL ➡ ZnCl2 + H2

Now balancing

Zn + 2HCL ➡ ZnCl2 + H2

Hope it will help :)❤

The coefficient placed before HCl which makes the equation to be balanced is 2.

To know which coefficient will be placed before HCl to balance the equation, we shall simply balance the equation given from the question.

Zn + HCl —> ZnCl₂ + H₂

The above equation can be balance as illustrated below:

There are 2 atoms of H on the right side and 1 atom on the left side. It can be balance by writing 2 before HCl as shown below:

Zn + 2HCl —> ZnCl₂ + H₂

Now, the equation is balanced.

From the balanced equation above, the coefficient written before HCl which makes the equation to be balance is 2.

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Answer:

i believe its blue

Explanation:

Answer:

Very toxic materials are substances that may cause significant harm or even death to an individual if even very small amounts enter the body.There are a number of very toxic materials that may be used in workplaces. Some examples include carbon monoxide, hydrogen sulfide, chlorine and sodium cyanide

Explanation:

here are generally four types of toxic entities; chemical, biological, physical and radiation: Chemical toxicants include inorganic substances such as, lead, mercury, hydrofluoric acid, and chlorine gas, and organic compounds such as methyl alcohol, most medications, and toxins.

The highly toxic chemical compounds can be changed to less toxic one by suitable substitution reactions where, a functional group which less hazardous but having the same biochemical properties are substituted for the new product.

Toxicity of a chemical is its ability to cause serious health risks which can strike a single cell. Exposure to toxic chemicals may even lead to death. The dose of toxicity depends on the structure and reactivity of the chemicals.

Also the adverse effect of each toxic chemicals depends on the way of exposure, and the amount of exposed chemical. There are some methods to detoxify a living body if any toxic is intaken. Suitable antidotes are given for them.

The toxicity generated in a chemical might be originated from a certain structure or group. Thus, by altering  that group for instance substituting a ring or removing them ir substituting a functional group that is responsible for the toxicity will make the chemical  less toxic.

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