Which of these plecas of evidence did not help in the development of the theory of plate tectonics

Chemistry

1 answer:

Afina-wow [57]3 years ago

3 0

No mountains in the world are increasing in size

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Which of the following atoms has the same number of neutrons as 19F? (2 points)

Lelu [443]

I dont know the answer choices but if isotopes is there then go with Isotopes

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2 years ago

Which statement is a hypothesis?

mel-nik [20]

A. is a hypothesis because hypotheses are usually in the form of if-then statements.

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3 years ago

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You need to prepare 100.0 mL of a pH 4.00 buffer solution using 0.100 M benzoic acid (p K a = 4.20 ) and 0.200 M sodium benzoate

bekas [8.4K]

Answer : The volume of sodium benzoate and benzoic acid solution mixed to prepare this buffer should be, 29.0 mL and 71 mL respectively.

Explanation :

Let the volume of sodium benzoate (salt) be, x

So, the volume of benzoic acid (acid) will be, (100 - x)

Using Henderson Hesselbach equation :

$pH=pK_a+\log \frac{[Salt]}{[Acid]}$

Now put all the given values in this expression, we get:

$4.00=4.20+\log \left(\frac{(\frac{0.200x}{100})}{(\frac{0.100(100-x)}{100})}\right)$

x = 29.0

The volume of sodium benzoate = x = 29.0 mL

The volume of benzoic acid (acid) = (100 - x) = (100 - 29.0) = 71 mL

Thus, the volume of sodium benzoate and benzoic acid solution mixed to prepare this buffer should be, 29.0 mL and 71 mL respectively.

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2 years ago

In which type of chemical bonding are electrons shared between adjacent atoms?

Vikki [24]

In covalent bonding electrons are shared betweed adjacent atoms.

This kind of bonding means that none of the atoms are detached from its electrons.

A molecule of compound is formed when two or more atoms are bonded through covalent bonds. The electrons shared are considered part of the valence electrons (outer energy level) of both atoms forming the covalent bonding.

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3 years ago

A 6.1-kg solid sphere, made of metal whose density is 2600 kg/m3, is suspended by a cord. When the sphere is immersed in a liqui

timama [110]

Answer:

Density of the liquid = 1470.43 kg/m³

Explanation:

Given:

Mass of solid sphere(m) = 6.1 kg

Density of the metal = 2600 kg/m³

Thus volume of the liquid :

$Volume(V)=\frac{Mass(m)}{Density (\rho)}$