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1 year ago

Write the value represented by 4.5x10-6 g

Chemistry

1 answer:

monitta1 year ago

6 0

the value represented by 4.5x10-6 g is 0.0000045 g it is a representation in standard notation

To express enormous figures which are in standard notation like 1,300,000 or exceedingly minuscule quantities like 0.0000000000045, scientists use scientific notation. Scientific notation, also referred to as exponential form, is one of the earliest mathematical techniques. It is well regarded by practitioners. People use scientific notation to handle situations where numbers are too large or too small to be calculated easily. Scientists, engineers, and mathematicians all use this technique. where as standard notation is way writing numbers in normal decimal form. The scientific method id most convenient denoting numbers as the numbers will be either too big or too small.

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Which of the following does NOT involve a change of state? a. pouring water into a vacuum-insulated bottle b. sublimation of dry

Elena L [17]

<h2> The correct option is (a).</h2>

Explanation:

There is no change of state in pouring water into a vacuum insulated bottle as the vacuum created inside the bottle only reduces the time limit for the transfer of heat by conduction and convection.
It helps the content filled in the bottle to be hot and cool for a longer time.

Hence, option (a) is correct.

Rest of the options (b), (c), (d), (e) is not correct because of the following reasons:

In the sublimation of dry ice, the dry ice (solid-state) is changed to the vapour form.
In the freezing of water, the liquid state is changed to solid-state.
During the vaporization of alcohol, the liquid state is changed to the vapour form.
During the melting of ice, the solid-state is changed to the liquid state.

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4 years ago

A scientist wants to know: "If salt is added to water, would the

bezimeni [28]

Answer:

no, the sollution will boil at a higher temperature because the density of the sollution will increase when salt is added to it

3 0

3 years ago

Read 2 more answers

At the most basic level, in order to produce oxygen and a carbohydrate (comprised of carbon, hydrogen, and oxygen), carbon dioxi

Kaylis [27]

At the most basic level, in order to produce oxygen and a carbohydrate (comprised of carbon, hydrogen, and oxygen), carbon dioxide must react with water as a source of hydrogen.

In order to construct carbohydrate molecules (often glucose) and release oxygen into the atmosphere, photosynthesis utilises carbon dioxide and water. Photosynthesis occurs in organelles called chloroplasts found in eukaryotic autotrophs like plants and algae.

Commonly used notation for photosynthesis is:

6CO $_{2}$ + 6H $_{2}$ O C $_{6}$ H $_{12}$ O $_{6}$ + 6O $_{2}$

This indicates that the reactants, six carbon dioxide molecules and six water molecules, are transformed into a sugar molecule and six oxygen molecules, the products, by light energy being absorbed by chlorophyll.

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8 0

2 years ago

What would be the molarity of a solution in which 0.56 mole of NaCl is dissolved in enough water to make 2.7 L of solution?

yan [13]

Answer:

Molarity = 0.21 M

Explanation:

Moles solute (mol) = Volume solution (L) x Molarity solution (M)

0.56 mol NaCl = 2.7 L x M

M = 0.2074074074

5 0

2 years ago

How many significant digits are in the number 125,001?

Yuri [45]

The number of significant digits in the number 125,001 are: 6.

Significant digits are always:
1. non-zero
2. Any zeros between two significant digits are significant (for example 5 and 1)
3. A final zero or trailing zeros in the decimal portion only are significant.

Hope I helped!

5 0

3 years ago