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3 years ago

What is the most important thing you need to remember for physical change?

1 answer:

5 0

The most important thing you need to know about physical change, is that a physical change does not change the identity, or chemical make up of an object or substance. For example, if you were to have an orange, and you painted it blue, it is still an orange, whereas if you burned the orange, it is no longer an orange. It would be soot/ash.

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Consider two different ions. The anion has a valence of -2. The cation has a valence of +2. The two ions are separated by a dist

strojnjashka [21]

Answer:

Force of attraction = 35.96 $\times 10^{27}$ N

Explanation:

Given: charge on anion = -2

Charge on cation = +2

Distance = 1 nm = $10^{-9}$ m

To calculate: Force of attraction.

Solution: The force of attraction is calculated by using equation,

$F = \dfrac{k \times q_1 q_2}{ \r^2}$ ---(1)

where, q represents the charge and the subscripts 1 and 2 represents cation and anion.

k = $8.99 \times 10^9 \ Nm^{2}C^{-2}$

F = force of attraction

r = distance between ions.

Substituting all the values in the equation (1) the equation becomes

$F = \dfrac{8.99 \times 10^9 \times 2 \times 2}{ \left ( 10^-9 \right )^2 }$

Force of attraction = 35.96 $\times 10^{27}$ N

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3 years ago

"what is the concentration of positive charge and mass in rutherford's atomic model called?"

Tamiku [17]

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3 years ago

What are chemical formulaes?<br> give your own response!!

lbvjy [14]

Answer:

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Explanation:

8 0

3 years ago

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Roman55 [17]

Answer:

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Explanation:

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2 years ago

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const2013 [10]

Answer:

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Explanation:

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2 years ago