# 6'Ds in inquiry

### Define by Casey.G

Define:

What is a reversible change?

Reversible change is when something can be say melted, and then be changed back to its original state. Another word for reversible change is physical change. Reversible/ Physical change doesn't produce new items/ things. The only thing it may change of the item is the shape or the feel.

Examples: Water+ cool= ice, ice+ heat= water

Salt+ water= saltwater+ sun= evaporation= salt

Wax+ heat= melted wax+ cool= solid wax

What is a non- reversible change?

Non-reversible change is like burning something because you can't change it back to its original state. So non-reversible change cant be changed so it's permenent. Other words for non-reversible change are: chemical/ physical change. Chemical/ irreversible/ non-reversible change creats new materials so it will start with one/ two materials and end up with multiple materials.

Example: egg+ heat= cooked egg

Engredients+ mix= mixed engredients+ bake= baked cake

Cement powder+ water+ time= hard cement

What are Variables in an experiment?

A variable is very important in an experiment. They are basically something in an experiment that can be changed or controlled. They can also be something that can be measured in an experiment. There are multiple types of variables in an experiment. One kind of variable is an independent variable this variable is one thing that can be changed in an experiment. For example the temperature in an experiment can be changed from hot to warm to cold. Another type of variable in an experiment is the dependent variable. This variable is the variable that you can measure. For example: measuring the temperature of the item in an experiment. The second last variable in an experiment is the controlled variable. The controlled variable is the variable that doesn’t change it stays constant. For example: the size and type of container to do an experiment. The last variable is called the extraneous variable. This last variable is extra things that happened in an experiment. As an example the outcome of your experiment you would normally write this in your lab book.

What is a hypothesis?

A hypothesis is when you take a guess about what will happen. Except this guess is not a wild guess this guess is coming from your knowledge/ what you know about something. For example: it will take 30 minutes for ice cube to melt but the ice cube may have salt on it so it will take longer to melt.

What is the structure of a scientific investigation/ report?

The scientific investigation/ report are 8 part piece of writing. This includes a title, an abstract, an introduction, a method, an results, an discussion, an reference list and a appendices. This tells you what happened, happens and may include a hypothesis.

What is the structure of a scientific investigation/ report?

The scientific investigation/ report are 8 part piece of writing. This includes a title, an abstract, an introduction, a method, an results, an discussion, an reference list and a appendices. This tells you what happened, happens and may include a hypothesis.

What is alchemy?

Alchemy is the mixing of chemicals in science. For example alchemy is used in turning led into gold. Another way to describe it is used in changing something such as mettle into gold.