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4 years ago

10

I'm lost....can anyone explain please?

1 answer:

pashok25 [27]4 years ago

3 0

I'll do A for you. They are all double displacement reactions. So recall: AB+CD--> CB+AD . Also, knowing the charges will help and make this so easy.

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Pellets of calcium chloride are spread on a sidewalk covered in water that is 36°C. Under which circumstance will the calcium ch

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People walking on the sidewalk crushthe calcium chloride pellets.

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3 years ago

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Which non-metal or metalloid is the most reactive?

Neko [114]

C. Borin is the answer

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3 years ago

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how do i word a formal letter to a teacher saying i didn't pay attention during the science lessons and i now have no idea what

Allushta [10]

Explanation:

Hello mr/mrs (name) I unfortunately couldn't pay attention to the class due to some issues I had therefore I don't know what we are doing in class

OR

Hello mr/mrs (name) I could understand what we were doing in class I would like it if you could break it down more or explain better to me

OR just say something it had something to do with your internet such as

Hello mr/mrs (name) I didn't understand what you were saying during our class due to some of my internet issues I was have throughout the day. I hope you can explain what we did during the class.

Those may be some of my excuses I've used before

they have worked for me:)

I don't know if that helped?:/

8 0

3 years ago

When a chemical reaction takes place, the number of atoms each element in the reactants ____ the number of atoms of each element

Rzqust [24]

Answer: is equal to

Explanation: According to law of conservation of mass, the mass can neither be created nor be destroyed. Thus the mass of products must be equal to the mass of reactants.

In order to have same mass on both sides of the chemical equation, the number of atoms of each element must be same in reactants as well as products.

$2Na+Cl_2\rightarrow 2NaCl$

6 0

3 years ago

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If 16g of <img src="https://tex.z-dn.net/?f=CH_%7B4%7D" id="TexFormula1" title="CH_{4}" alt="CH_{4}" align="absmiddle" class="la

sammy [17]

43.56 grams of are produced if 16g of CH4 reacts with 64g of O2.

Explanation:

Balance equation for the reaction:

CH4 + 2O2⇒ CO2 +2H2O

Data given : mass of CH4 =16 grams atomic mass = 16.04 grams/mole

mass of water 36 gram atomic mass = 18 grams/moles

mass of CO2=? atomic mass = 44.01 grams/mole

number of moles = $\frac{mass}{atomic mass of one mole}$ equation 1

number of moles in CH4

n = $\frac{16}{16.04}$

= 0.99 moles

Since combustion is done in presence of oxygen hence it is an excess reagent and methane is limiting reagent so production of CO2 depends on it.

From the equation

1 mole of CH4 gave 1 mole of CO2

O.99 moles of CH4 will give x moles of CO2

$\frac{1}{1}$ = $\frac{x}{0.99}$

x = 0.99 moles of carbon dioxide

grams of CO2 = number of moles x atomic mass

= 0.99 x 44.01

= 43.56 grams of CO2 is produced.

4 0

3 years ago