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3 years ago

What is the correct formula for Na+ and (SO4)2- ?

Physics

2 answers:

juin [17]3 years ago

4 0

Answer:

A)Na2SO4

Explanation:

When reaction between NaOH and H2SO4 take place then Na2SO4 comes out as a product.

Na2SO4 is a salt .We know that when base and acid react then salt will produce as a product.

Na2SO4 is called sodium sulfate.

Two sodium ions and one sulfuric ions make sodium sulfate.

$2Na^+ + SO_4^{-2}\rightarrow Na_2SO_4$

So option A is correct.

Scrat [10]3 years ago

3 0

I think it is a) Na2SO4

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viktelen [127]

Answer:

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2) 3.31 seconds

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Explanation:

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s = Displacement

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Acceleration of the cheetah is 8.68 m/s²

$v=u+at\\\Rightarrow t=\frac{v-u}{a}\\\Rightarrow t=\frac{28.7-0}{8.68}\\\Rightarrow t=3.31\ s$

It takes a cheetah 3.31 seconds to reach its top speed.

$v^2-u^2=2as\\\Rightarrow s=\frac{v^2-u^2}{2a}\\\Rightarrow s=\frac{28.7^2-0^2}{2\times 8.68}\\\Rightarrow s=47.5\ m$

It travels 47.5 m in that time

4) When s = 120 m

$s=ut+\frac{1}{2}at^2\\\Rightarrow 120=0\times t+\frac{1}{2}\times 8.68\times t^2\\\Rightarrow t=\sqrt{\frac{120\times 2}{8.68}}\\\Rightarrow t=5.26\ s$

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