Answer:
This is a physical change because it's not permanent and no chemical reaction occurs. Mixtures - Mixing together materials where one is not soluble in the other is a physical change. Note the properties of a mixture may be different from its components.
Explanation:
The difference between a physical reaction and a chemical reaction is composition. In a chemical reaction, there is a change in the composition of the substances in question; in a physical change there is a difference in the appearance, smell, or simple display of a sample of matter without a change in composition.
In a physical change, the molecules are rearranged while their actual composition remains same. In a chemical change, the molecular composition of a substance completely changes and a new substance is formed. Some example of physical change are freezing of water, melting of wax, boiling of water....
I think its C i don't know if i am right
They are weak, short-range electrostatic attractive forces between uncharged molecules, arising from the interaction of permanent or transient electric dipole moments.
Answer:
0.00446 grams of hydrogen are produced.
Explanation:
Atmospheric pressure at which hydrogen gas was collected = p= 742.1 mmHg
Vapor pressure of the hydrogen gas = p' = 22.4 mmHg
Pressure of the hydrogen gas = P
P = p - p' = 742.1 mmhg - 22.4 mmhg = 719.7 mmHg
719.7 mmHg =
1 atm = 760 mmHg
Volume of the hydrogen gas ,V = 57.48 mL = 0.05748 L
1 mL =0.001 L
Temperature of the hydrogen gas = T = 24°C=24+ 273 K = 297 K
Moles of hydrogen gas = n
( Ideal gas equation)
n = 0.00223 mol
Mass of 0.00223 moles of hydrogen gas:
0.00223 mol × 2 g/mol = 0.00446 g
0.00446 grams of hydrogen are produced.
Remains the same because temperature can't change energy