8th Grade Unit #4 Changes in matter practice

Front

What is the pH range of human blood?

Back

The pH range of human blood is between 7.38 and 7.42, indicating it is slightly basic.

Front

What defines a compound in chemistry?

Back

A compound is made up of different kinds of atoms that are chemically combined and can be broken down into simpler substances.

Front

What is a hypothesis in scientific research?

Back

A hypothesis is a proposed explanation for a phenomenon that can be tested through experiments.

Front

What is the importance of controlled experiments?

Back

Controlled experiments allow scientists to isolate variables and determine the effect of one variable on another.

Front

What does it mean if evidence fails to support a hypothesis?

Back

It means that the results of an experiment do not align with the predictions made by the hypothesis.

Front

What is the role of observations in forming a hypothesis?

Back

Observations help scientists identify patterns and make informed predictions that lead to the formulation of a hypothesis.

Front

What is the difference between qualitative and quantitative data?

Back

Qualitative data describes characteristics or qualities, while quantitative data involves numerical measurements.

Front

What is the scientific method?

Back

The scientific method is a systematic process for investigating phenomena, acquiring new knowledge, or correcting and integrating previous knowledge.

Front

What is an example of a physical change?

Back

An example of a physical change is melting ice into water, where the substance changes state but not its chemical composition.

Front

What is an example of a chemical change?

Back

An example of a chemical change is rust forming on iron, which results in a new substance.