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3 years ago

What can be used to measure the ph of a substance

1 answer:

3 0

The pH value can be measured using electrochemical measuring systems, litmus paper, or indicators and colorimeters. The easiest way to take a pH measurement is to use litmus paper or a colorimeter. The advantage of this type of pH measurement is that the pH range is well known and they are easy to apply.

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A balanced chemical equation is a direct presentation of the ___________.

Lisa [10]

Answer:

The chemical equation needs to be balanced so that it follows the law of conservation of mass. A balanced chemical equation occurs when the number of the different atoms of elements in the reactants side is equal to that of the products side.

Explanation:

How do you balance equations?

In general, however, you should follow these steps:

1. Count each type of atom in reactants and products.

2. Place coefficients, as needed, in front of the symbols or formulas to increase the number of atoms or molecules of the substances.

3. Repeat steps 1 and 2 until the equation is balanced.

5 0

3 years ago

You decide to make a salad for dinner. You have lettuce, tomatoes, olives, onions, cheese, and of course your favorite salad dre

Brums [2.3K]

Homogeneous mixture. (all of the different components of the salad are shown)

4 0

3 years ago

Read 2 more answers

Use de Broglie's hypothesis to determine the speed of the electron in a hydrogen atom when in the n = 5 orbit, whose radius is 1

andriy [413]

Answer:

Velocity = 4.41×10⁵ m/s

Explanation:

The force of attraction between the nucleus and the electron is equal to the centrifugal force acting on the outermost electron due to circular rotation. It can be mathematically written as:

$\frac {K\times q^2}{r^2}=\frac {m\times v^2}{r}$

Where,

K is the Coulomb's constant having value 9×10⁹ N. m²/C²

q is the charge on the electron or the proton which is 1.6×10⁻¹⁹ C

r is the radius of the atom

m is the mass of the electron having value 9.1×10⁻³¹ Kg

v is the velocity of the electron.

The equation can be written to calculate the velocity as:

$v=\sqrt {\frac {K\times q^2}{m\times r}}$

Given that:

r = 1.3×10⁻⁹ m

So,

$v=\sqrt {\frac {9\times 10^9\times (1.6\times 10^{-19})^2}{9.1\times 10^{-31}\times 1.3\times 10^{-9}}}$

<u>Velocity = 4.41×10⁵ m/s</u>

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3 years ago

What Element is named for the inventor of dynamite

timama [110]

Nobelium discovered in Berkeley California

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3 years ago

Which of the following was a major force of atmospheric oxygen?

ad-work [718]

The answer is B photosynthesis

7 0

3 years ago