---
title: How do I input answers in ICE charts?
description: How to use the Initial, Change, Equilibrium (ICE) charts in Stemble
---

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# How do I input answers in ICE charts?

## How to use the Initial, Change, Equilibrium (ICE) charts in Stemble

This support article applies to *legacy* ICE charts in Stemble, as shown in the image below.

ICE charts are common in chemistry to indicate the *initial*, *change in,* and *equilibrium* concentrations of species in a chemical reaction. Many tasks in Stemble utilize ICE charts as a convenient and intuitive input tool to allow students to express their work.

- Indicate **unknown** concentrations with an "**x**"
- The "x" character can be preceded by a **− sign** if necessary. It may also be preceded by a + sign, although that is *optional*.
- Numbers may be combined with the "x" sign to express symbolic algebraic expressions (see image below).
- A space left blank is **not the same** as a space that contains "0". If you intend to answer "0" for one of the spaces, you must enter it explicitly.

![ICE\_Chart\_Input](https://support.stemble.com/hs-fs/hubfs/ICE_Chart_Input.png?width=670&name=ICE_Chart_Input.png)

Note: Characters that are not accepted as inputs are not able to be typed in, including (but not limited to) spaces and other text characters.

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