Answer:
<span>A 3.1 L sample of hydrogen at the same temperature and pressure contains the same number of molecules.
Explanation:
As we know ;"1 mole of any gas at STP occupies exactly 22.4 L of volume". Therefore, CO</span>₂ and H₂ gas having same number of moles (0.20 moles) will occupy exactly the same volume.
Now, converting moles into number of molecules,
# of Molecules = Moles × 6.022 × 10²³
Putting value of mole,
# of Molecules = 0.2 mol × 6.022 × 10²³ molecules.mol⁻¹
# of Molecules = 1.20 × 10²³ molecules
Hence, both gases will contain 1.20 × 10²³ molecules.
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Physical changes can be reversed and chemical changes can’t be reversed. A physical property is a characteristic which can be identified without changing the substance but to identify a chemical property, you do have to change the substance.
Answer:
(a) 6.38 × 10⁻²⁹ kg·m·s⁻¹; (b) 7.00 kg·m·s⁻¹; (c) 82.7 µm; (d) 7.53 × 10⁻³⁴ m;
(e) Δx ∝ 1/m
Explanation:
(a) Momentum of electron
p = mv = 9.11 × 10⁻³¹ kg × 70.0 m·s⁻¹ = 6.38 × 10⁻²⁹ kg·m·s⁻¹
(b) Momentum of tennis ball
p = mv = 0.1000 kg × 70.0 m·s⁻¹ = 7.00 kg·m·s⁻¹
(c) Δx for electron
Δp = 0.010p = 0.010 × 6.38 × 10⁻²⁹ kg·m·s⁻¹ = 6.38 × 10⁻³¹ kg·m·s⁻¹
(d) Δx for tennis ball
Δp = 0.010p = 0.010 × 7.00 kg·m·s⁻¹ = 0.0700 kg·m·s⁻¹
(e) Relative uncertainty
Both particles are travelling at the same speed, so,
ΔxΔp = Δx × mv = mvΔx = constant
v is constant, so
Δx ∝ 1/m
Thus, the larger the mass of an object, the smaller the uncertainty in its velocity.
Electronegativity
The tendency of an atom to pull electrons towards itself is called electronegativity.
It is the tendency of an atom to attract bonding pair of electrons towards itself. These atoms which are more electronegative are able to bear a negative charge and be stable.
Unlike electropositive elements which tend to lose electrons , electronegative elements hold on tightly to the electrons.
The electronegativity is measured using the Pauling Scale where the most electronegative element of the periodic table, Fluorine , is given a value of 4 and the rest of the elements have values lower than 4 according to the trends followed by their groups and periods.
The least electronegative element of the periodic table , Cesium has a value of 0.7 on the Pauling Scale.
Electronegativity increases when we move from left to right in the periodic table and it decreases (in general) when we move down the group.
(To know more about Electronegativity: https://brainly.in/question/5742635 )
