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fgiga [73]
3 years ago
5

Time zones were adopted to fix what problem

Chemistry
2 answers:
morpeh [17]3 years ago
8 0

Time Zones were adopted to fix the time. Without the time zone, you will never know what time it is

SCORPION-xisa [38]3 years ago
5 0

To know when the sun goes up and down

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13.How many grams of phosphorus (P4) are needed to completely consume 79.2 L of chlorine gas according to the following reaction
BabaBlast [244]

Answer:

73.2g

Explanation:

The reaction expression is given as:

              P₄   +   6Cl₂   →  4PCl₃

Given parameters:

Volume of chlorine gas  = 79.2L

Unknown:

Mass of Phosphorus needed  =  ?

Solution:

To solve this problem, let us find the number of moles of the chlorine gas.

Since the condition of the reaction is at STP;

           22.4L of gas is contained in 1 mole

          79.2L of chlorine gas will contain \frac{79.2}{22.4}   = 3.54mole

From the reaction expression;

           6 moles of chlorine gas will react with 1 mole of P₄  

 3.54 mole of chlorine gas will completely react with \frac{3.54}{6}   = 0.59mole of P₄

Mass of P₄  = number of moles x molar mass

   Molar mass of P₄  = 4 x 31  = 124g/mol

Mass of P₄  = 0.59 x 124  = 73.2g

8 0
3 years ago
Que tipo de mistura tem a agua mineral?
QveST [7]

Answer:

mezcla homogénea

El agua en sí es un ejemplo de mezcla homogénea. Todo el agua, excepto la más pura, contiene minerales y gases disueltos. Estos se disuelven en todo el agua, por lo que la mezcla se presenta en la misma fase y es homogénea.

6 0
2 years ago
) Experimental evidence indicates that the nucleus of an atom
geniusboy [140]

Answer:

A (contains most of the mass of the atom)

Evidence has it that a proton is about 2000 times as massive as an electron.

And there is usually multiple protons and neutrons in the nucleus

From what I just said, you can say that B is wrong

C however is also wrong because protons have a +charge and neutrons are neutrle which means you always have a charge > (greater than) 0

And D is wrong because electrons (which are not in the nucleus) have a neg charge. and protons have a + charge and are in the nucleus

So your answer is A

Hope it helped

Spiky Bob

5 0
3 years ago
Complete and balance the molecular equation, including phases, for the reaction of aqueous sodium sulfate, Na2SO4, and aqueous b
expeople1 [14]
The complete chemical reaction of aqueous Sodium sulfate and aqueous Barium nitrate is

Na_{2}  SO_{4} (aq) + Ba(NO_3)_2(aq) -\ \textgreater \  BaSO_4(s) + 2NaNO_3(aq)

The right side and the left side of the reaction have equal number of elements, therefore it is balanced.

5 0
3 years ago
Read 2 more answers
______ is the type of heat that roasts the marshmallows.
disa [49]

Answer:

I think B

tell me if I'm wrong

5 0
3 years ago
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