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3 years ago

According to Newton’s first law of motion, when will an object at rest begin to move?

Chemistry

2 answers:

Maurinko [17]3 years ago

8 0

When it is acted upon by an outside force

Reika [66]3 years ago

6 0

An object at rest begin to move when it is forced by another object or a outside force.

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From the Henderson-Hasselbalch equation, explain how the ratio [Al/[HA] changes with changing pH

Kryger [21]

Answer:

The ratio [A-]/[HA] increase when the pH increase and the ratio decrease when the pH decrease.

Explanation:

Every weak acid or base is at equilibrium with its conjugate base or acid respectively when it is dissolved in water.

$HA + H_{2}O$ ⇄ $A^{-} + H_{3}O^{+}$

This equilibrium depends on the molecule and it acidic constant (Ka). The Henderson-Hasselbalch equation,

$pH = pKa + Log \frac{[A^{-}]}{[HA]}$

shows the dependency between the pH of the solution, the pKa and the concentration of the species. If the pH decreases the concentration of protons will increase and the ratio between A- and AH will decrease. Instead, if the pH increases the concentration of protons will decreases and the ratio between A- and AH will increase.

5 0

3 years ago

What element has the same number of valence electrons as sulfur?

FinnZ [79.3K]

Oxygen. Is the correct answer

Oxygen has the same number of valence electrons as sulfur. An ion can be an element that gained or lost an electron.

6 0

2 years ago

A molecule of alkene has the chemical formula C3H4. How many carbon-carbon double bonds are present in the molecule?Choices:123

alexdok [17]

2 Carbon double bonds

4 0

3 years ago

Science fair ideas? please help

egoroff_w [7]

You can Maybe do a volcano?

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3 years ago

Read 2 more answers

Picture this in your mind as you read it: You weigh an empty, clean, dry beaker on the balance (scale). It weighs 32.15 grams. Y

AleksAgata [21]

Answer:

2.25 g

Explanation:

The mass of the solid X must be the total mass (beaker + solid X) less than the mass of the beaker. Then:

mass of the solid X = 34.40 - 32.15

mass of the solid X = 2.25 g

The difference of 0.25 g must occur for several problems: an incorrect weight in the balance, the configuration of the balance, the solid can be hydrophilic and absorbs water, and others.

6 0

3 years ago