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A way of writing a number as $A\times10^n$ , where $1\leq A<10$ and is an integer.

A way of writing a number as a value between 1 and 10 multiplied by a power of ten, such as $1 \times 10^{-10}\,\text{m}$ .

To communicate their size, chemists use very small metric units, standard form and . These allow us to compare atomic dimensions with familiar objects even when the scales differ enormously.

Write the final answer in standard form as $A\times10^n$ , where $1\leq A<10$ .

A way of writing very large or very small numbers in the form $a\times10^n$ , where $1\leq a<10$ .

A way of expressing a number as a value between 1 and 10 multiplied by a power of ten.

Writing a number in the form $a \times 10^n$ , where $1 \leq a < 10$ and $n$ is an integer; this makes its significant figures unambiguous.

A value written as $a\times10^n$ , where $1\leq a<10$ and $n$ is an integer.

A way of writing a number as $A \times 10^n$ , where $1 \leq A < 10$ and is an integer.

A way of writing a number as $a \times 10^n$ , where $1 \leq a < 10$ and $n$ is an integer.

Standard form can make the comparison quicker.

A way of writing a number as a value from 1 up to, but not including, 10 multiplied by a power of 10; it can show significant figures unambiguously.

In standard form, check that the coefficient is at least 1 but less than 10. For example, write $24\times10^{-9}$ as $2.4\times10^{-8}$ .

When multiplying numbers in standard form, multiply the numbers at the front and add the powers of ten. Rewrite the answer if the front number is 10 or more.

A way of writing a number as a value from 1 up to, but not including, 10 multiplied by a power of ten.

A number written as $a\times10^n$ , where $1\leq a<10$ and $n$ is an integer.

Standard form

Definition

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Edexcel GCSE Chemistry · 1CH0

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OCR GCSE Chemistry A · J248

OCR GCSE Chemistry B · J258