Answer:
1. Density can be used to identify a substance
2. Density can be used to ascertain whether a substance will float in water.
Explanation:
The calculation of the density of a substance can be used to identify the substance. If the density of a substance is calculated accurately, and compared with a table of standard densities, then we can identify that substance.
Also, density determines whether an object will float or sink in water. If an object is less dense than water then it will float in water. If it is denser than water, then it will sink in water.
Answer:
The correct answer is 1.89130 × 10⁻² g per ml.
Explanation:
Based on the given information, the volume of the water sample is 46 ml, the temperature given is 21 degree C. Weight of the compound mineral X is 0.87 grams obtained post evaporating, washing, and drying of the sample. Yes, on the basis of the given information, one can find the solubility of compound X in water at 21 degree C.
As 46 ml of water comprise 0.87 grams of the mineral compound X. Therefore, 1 ml of the water sample will comprise,
= 0.87/46 g of X
= 1.89130 × 10⁻² grams
Hence, the solubility of the compound X in the sample of water is 1.89130 × 10⁻² gram per ml.
Thomson's plum pudding model dictated that the atom contains negative charges surrounded by positive charges in close vicinity. Rutherford's experiment determined that the particles are not this close and the atom consists mainly of empty space and that it is the negative charge that surrounds the positive charge, not the other way around.
Proton mass = 1.00728 amu
neutron mass = 1.0086 amu
electron mass = 0.000549 amu
so the mass is :
(7 * 1.00728) - (7 * 1.0086) - (7 * 0.000549) - 14.003074
= 0.11235 amu
Two molecules of HBr collide and then form H2 and Br2. During the collision, the bonds in the HBr molecules are <span>(3) formed as energy is absorbed.</span>