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3 years ago

State the number of sig figs in each value:

Chemistry

1 answer:

Rasek [7]3 years ago

8 0

Answer:

Explanation:

Significant figure implies number of digits that are to be considered. Some rules are required to be considered when writing a given expression to an expected significant figures.

So that:

1) 0.00004050 is 4 significant figures

2) 54.7000 is 6 significant figures

3) 1,000.09 is 6 significant figures

4) 0.039 is 2 significant figures

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An ultraviolet ray of light has a wavelength of 1.5x10^-8 m. What is the ray's frequency?

frutty [35]

Answer:

2 E16 Hz or 2 * 10^16 Hz

Explanation:

The formula to determine frequency is f = c / λ.

f = frequency

c = speed of light

λ = wavelength

f = 3E8 / 1.5E-8

f = 2E16

This makes sense because UV light exists roughly

between 8E14 Hz and 3E16 Hz ----- 2E16 Hz falls in that range

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3 years ago

What is determined by calculating the slope of the position versus time graph distance

Ymorist [56]

Answer:

Determining the Slope on a p-t Graph. It was learned earlier in Lesson 3 that the slope of the line on a position versus time graph is equal to the velocity of the object. ... If the object has a velocity of 0 m/s, then the slope of the line will be 0 m/s. The slope of the line on a position versus time graph tells it all.

Explanation:

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3 years ago

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A solution at ph 10 contains __________ than the same amount of solution at ph 8.

Sindrei [870]

100 times less H+

A solution at ph 10 contains 100 times less H+ than the same amount of solution at ph 8.

<h3>The pH scale: How does it function?</h3>

The pH scale determines how acidic or basic water is.
The range is 0 to 14, with 7 representing neutrality.
Acidity is indicated by pH values below 7, whereas baseness is shown by pH values above 7.
In reality, pH is a measurement of the proportion of free hydrogen and hydroxyl ions in water.

<h3>How does the pH change when two acids are combined?</h3>

An acid's strength increases with the quantity of hydrogen ions it releases.
The pH of the strong acids is between 1 and 2.
We may observe that there is no response when two acids of the same strength are combined.
It's because the end product will be neutral and the pH won't change.

<h3>How is pH value determined?</h3>

There are two ways to measure pH:

colorimetrically with indicator fluids or sheets
electrochemically with electrodes and a millivoltmeter for greater accuracy (pH meter).

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2 years ago

What are some differences between Boiling & Evaporation?

Angelina_Jolie [31]

Boiling happens much faster! Boiling also takes place at the bottom of the fluid whereas evaporation takes place at the top.

Hope this helps!

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3 years ago

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Select the correct answer. When an atom in a reactant loses electrons, what happens to its oxidation number? A. Its oxidation nu

vfiekz [6]

Answer:

C. Its oxidation number increases.

Explanation:

Oxidation is defined as the loss of electrons by an atom while reduction is the gain of electrons by an atom.
Atoms of elements have an oxidation number of Zero in their elemental state.
When an atom looses electrons it undergoes oxidation and its oxidation number increases.
For example, an atom of sodium (Na) at its elemental state has an oxidation number of 0. When the sodium atom looses an electrons it becomes a cation, Na+, with an oxidation number of +1 , the loss of electron shows an increase in oxidation number from 0 to +1.

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3 years ago

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