Answer:
a chemical change is usually an irreversible chemical reaction. an example of this is rusting.
a physical change is usually visible while a chemical change isn't. also, a chemical change is irreversible while a physical change is.
Explanation:
Mass of the bullet (m) = 8.13 g = 0.00813 kg
velocity of the bullet (v) = 1337 miles/hr
The de Broglie wavelength (∧) of an object of mass (m) travelling at a velocity (v) is given as:
∧ = h/m*v
where h = Planck's constant = 6.626 *10^-34 kgm2/s
Convert velocity from miles/hr to m/s
1 mile/hr = 0.447 m/s
1337 miles/hr = 0.447*1337 = 597.64 m/s
∧ = 6.626*10^-34 m2.Kg.s-1/0.00813 kg * 597.64 ms-1
∧ = 1.363*10^-34 m
Answer:
THOSE RESOURCES THAT ARE FOUND IN NATURE ARE CALLED NATURAL RESOUCES
Answer:
32.57g
Explanation:
mass = mole x molar mass
mass of LiBr = 0.375 x 86.85
mass = 32.57g
This is the complete question with grammar corrections:
A glass vessel calibrated to contain 9.76 mL at 4° C was found to weigh 22.624 g when empty and dry. Filled with a soduim chloride (NaCl) solution at the same temperature , it was found to weigh 32.770 g. Calculate the solution's density.
Answer:
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Explanation:
<em>Density</em> is the physical property that expresses the amount of matter (mass) per voumetric unit of solution:
In this problem, you can first calculate the mass, by difference. After that, you just have to divide the mass by the volume of the glass vessel (9.76 ml as per the calibration).
This is the two steps procedure.
<u>1. Mass of the solution:</u>
- Mass of solution = mass of the vessel filled with the solution - mass of the vessel, empty and dry
Mass of solution = 32.770 g - 22.624 g = 10.146 g
<u>2. </u><em><u>Solution's density</u></em><u>:</u>
- density = mass / volume = 10.146 g / 9.76 ml = 1.0395 g / ml ≈ 1.04 g/ml
The density is rounded to 3 significant digits because the volume, which is dividing the mass, was reported with 3 significant digits.
