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Gala2k [10]
3 years ago
14

Campare and Conteast Physical and chemical properties.

Chemistry
1 answer:
I am Lyosha [343]3 years ago
3 0

Answer:

Physical properties are changes in color, weight, mass, density, volume, whether it is freezing, tarnishing, boiling, etc. while chemical properties are changes in the compound of the object such as whether an object is/isn't flammable, affected by acid, it dissolves, ferments, rots, ignites in water, etc.

Explanation:

Physical property examples: a piece of steel is cut in half, a sugar cube is ground up into a powder, ice melts into water, clouds form in the sky, you mow the lawn, the water turned purple when you dropped red and blue dye in it, leaves grow in the spring, ethyl alcohol boils at 79° C, you cut apples up

Chemical property examples: pancakes cook on the griddle, fireworks explode in th sky, Alka-Seltzer gives off carbon dioxide when added to water, roasting a marshmellow, milk sours when left on the counter, burning wood in a bonfire, salt dissolves in water, food is digested in the stomach

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HELP ME IS IMPORTANT I WILL GIVE REWARDS OR ANYTHING U WANT​
Alexus [3.1K]
The answer to A is hydrogen I think
5 0
2 years ago
What is the charge of an electron<br> A. -1<br> B. 0<br> C. +1<br> D. +2
Gelneren [198K]

Answer:

A

Explanation:

I believe it is negative 1.

6 0
3 years ago
Hydrogen gas and oxygen gas combine to form water. How many grams of oxygen are needed to react with 45.7 grams of hydrogen ?
Julli [10]
The balanced equation:
         2 H₂   +   O₂   →   2 H₂O

moles of Hydrogen  = mass of hydrogen ÷ molar mass of hydrogen
                                  =  45.7 g ÷ 2 g/mol
                                  = 22.85 mol

Now, the mole ratio of O₂  :  H₂  is  1  :  2 
    which means that there are two times as much moles of H₂ as O₂ taking
    part in the reaction

Thus since moles of H₂  =  22.85 mol
then moles of O₂  =  22.85 ÷ 2 = 11.425 mol

Mass of O₂  = moles of O₂  × molar mass of O₂

                    = 11.425 mol  ×  32 g/mol

                    =  365.6 g

∴  <span>grams of oxygen are needed to react with 45.7 grams of hydrogen is 365.6g</span>
8 0
3 years ago
Determine the theoretical yield of P2O5, when 3.07 g of P reacts with 6.09 g of oxygen in the following chemical equation
saveliy_v [14]

Answer: 14.2 grams

Explanation:-

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number 6.023\times 10^{23} of particles.

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}

given mass of phosphorous (P) = 3.07 g

Molar mass of phosphorous (P) =  31 g/mol

Putting in the values we get:

\text{Number of moles of phosphorous}=\frac{3.07g}{31g/mol}=0.1moles

given mass of oxygen O_2 = 6.09 g

Molar mass of oxygen O_2 =  32 g/mol

Putting in the values we get:

\text{Number of moles of oxygen}=\frac{6.09g}{32g/mol}=0.2moles

According to stoichiometry:

4P+5O_2\rightarrow 2P_2O_5

4 moles of phosphorous combine with 5 moles of oxygen

Thus 0.1 moles of phosphorous combine with =\frac{5}{4}\times 0.1=0.125 moles of oxygen

Thus phosphorous acts as limiting reagent as it limits the formation of product and oxygen is the excess reagent.

4 moles of phosphorous gives=  2 moles of P_2O_5

Thus 0.1 moles of phosphorous gives =\frac{2}{4}\times 0.1=0.05 moles of P_2O_5

mass of P_2O_5=moles\times {\text {Molar mass}}=0.05\times 284=14.2g

Thus the theoretical yield of P_2O_5 is 14.2 grams.

5 0
3 years ago
___ molecules form ___ bonds between two or more nonmetal atoms by sharing electrons.
Evgesh-ka [11]
B, sharing electrons is a characteristic of covenant bonds.
4 0
3 years ago
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