<span>d.2HNO3 (aq) + Sr(OH)2 (aq) → 2H2O (l) + Sr(NO3)2(aq)
4H </span>4H
8O 8O
2N 2N
1Sr 1Sr<span>
</span>
Answer:
Mass is the amount of matter in an object and does not change with location.
Explanation:
Water boils at 100 Degrees Celsius or 212 degrees Fahrenheit
If we laid each atom end-to-end, they would reach about 20 times the distance from Earth to the Moon.
<em>Assum</em>e that sand has a density of 2 g/cm³ and consists of units of SiO₂.
<em>V</em> = 1 mm³ × (1cm/10 mm)³ = 1 × 10⁻³ cm³
Mass = 1 × 10⁻³ cm³ × (2 g/1 cm³) = 2 × 10⁻³ g
Moles of SiO₂ = 2 × 10⁻³ g × (1 mol SiO₂/60.08 g SiO₂) = 3 × 10⁻⁵ mol SiO₂
Units of SiO₂ = 3 × 10⁻⁵ mol SiO₂ × (6.022 × 10²³ units SiO₂/1 mol SiO₂)
= 2 × 10¹⁹ units SiO₂
Atoms = 2 × 10⁻¹⁹ units SiO₂ × (3 atoms/1 unit SiO₂) = 6 × 10¹⁹ atoms
<em>Assume</em> that each atom has a diameter of 140 pm. If we laid them end to end, they would stretch for
6 × 10¹⁹ atoms × (140 × 10⁻¹² m/1 atom) = 8 × 10⁹ m = 8 × 10⁶ km
That’s 20 times the distance from Earth to he Moon.
It's -Bohr's Model- becuase Dalton I dont think did a model. Thomson's was the "Plum Pudding Model." Ernest Rutherford drew one out(I dont know i dont have a model down though) so it the only one left is Dalton's Model which is it. (Hopefuly)