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Phoenix [80]
3 years ago
14

SOMEONE PLEASE HELP ME!

Chemistry
1 answer:
vazorg [7]3 years ago
4 0

Answer:

Both, the comb and the hair are comprised of atoms, which are, on their part, comprised of electrons ( negatively charged particles). When Sandra combs her hair, friction between comb and hair occurs. Since the electrons in hair are more loosely connected to each other than the ones in comb, during this friction some electrons from the hair will be transferred to the comb. Since electrons are negatively charged and the comb now has excess electrons that means that the comb becomes negative and the hair becomes positive ( because it loses negative charge). This friction is responsible for charging the hair and the comb. Finally, when the comb is placed near the hair, hair will move toward the comb since the opposite charges attract.

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Wrong answers only!<br><br><br> What color is an orange?
Anastaziya [24]

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Blue

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Solid lead acetate is slowly added to 75.0 mL of a 0.0492 M sodium sulfate solution. What is the concentration of lead ion requi
Firdavs [7]

Answer:

The concentration of lead ion required to just initiate precipitation is -2.37\times10^-^5 M

Explanation:

Lets calculate -:

Solubility equilibrium -: PbI_2(s) ⇄ Pb^2^+ (aq) + 2I^- (aq)

Solubility product of PbI_2 ,Q=[Pb^2^+]_i_n_i_t_i_a_l [I^-]^2_i_n_i_t_i_a_l =9.8\times10^-^9

Concentration of I^-=[KI]=0.0492M

When the ionic product exceeds the solubility product , precipitation of salt takes place .

                                   Q_s_p\geq K_s_p

        [Pb^2^+]_i_n_i_t_i_a_l [I^-]^2_i_n_i_t_i_a_l \geq 9.8\times10^-^9

      [Pb^2^+]_i_n_i_t_i_a_l  [0.0492]^2 \geq 9.8\times10^-^9

                       [Pb^2^+]_i_n_i_t_i_a_l \geq \frac{9.8\times10^-^9}{[0.0492]^2}

                        [Pb^2^+]_i_n_i_t_i_a_l \geq \frac{9.8\times10^-^9}{2.42\times10^-^3}

                        [Pb^2^+]_i_n_i_t_i_a_l \geq 2.37\times10^-^5 M

Thus , PbI_2 will start precipitating when [Pb^2^+]_i_n_i_t_i_a_l   \geq 2.37\times10^-^5 M.    

3 0
3 years ago
Two mineral samples have the same size. The heavier one has a higher _____________. *
Simora [160]

Answer:

Density

Explanation:

D= m/v

5 0
3 years ago
PLZZZ HELP ME ASAP
Vesna [10]

de Broglie's wave equation describes that particles have wave properties. The equation is  

   λ = h/mv

Where λ  is the wave length of the particle (m), h is the Planck's constant (6.62607 x 10⁻³⁴J s), m is the mass of a particle (kg) and v is the velocity (m/s).

λ = ?

h =  6.62607 x 10⁻³⁴ J s

m =200 g = 0.2 kg

v = 20 m/s

By substitution,

   λ  = 6.62607 x 10⁻³⁴ J s / (0.2 kg x 20 m/s)

   λ  = 1.66 x 10⁻³⁴ m

Hence, the wavelength of the 200 g ball 1.66 x 10⁻³⁴ m.

7 0
3 years ago
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