Podcast
Questions and Answers
What is the first step in the scientific method?
What is the first step in the scientific method?
- Design and perform experiments to test the hypothesis
- Form a hypothesis
- Make an observation (correct)
- Accept or modify the hypothesis based on the experimental results
Why are about 25 elements essential to life?
Why are about 25 elements essential to life?
- Because these elements are highly reactive
- Because they are used to form compounds necessary for living organisms (correct)
- Because they are the most abundant elements in the universe
- Because these elements are found in large quantities in nature
What is the structure of an atom?
What is the structure of an atom?
- Protons, electrons, and isotopes
- Molecules, ions, and isotopes
- Protons, neutrons, and electrons (correct)
- Neutrons, ions, and atomic mass
Which type of bond is a substance consisting of two or more different elements in a fixed ratio?
Which type of bond is a substance consisting of two or more different elements in a fixed ratio?
What makes up about 96% of the weight of most living organisms?
What makes up about 96% of the weight of most living organisms?
What is the last step in the scientific method?
What is the last step in the scientific method?
What type of bond is formed when electrons are transferred between two atoms?
What type of bond is formed when electrons are transferred between two atoms?
Which type of bond results in electrons being shared equally between two atoms?
Which type of bond results in electrons being shared equally between two atoms?
What is the role of hydrogen bonds in water's behavior?
What is the role of hydrogen bonds in water's behavior?
In which type of solution is water the solvent?
In which type of solution is water the solvent?
What is the pH range of the pH scale?
What is the pH range of the pH scale?
What do buffers do in relation to pH?
What do buffers do in relation to pH?
What is an element in chemistry?
What is an element in chemistry?
What do isotopes of an element have in common?
What do isotopes of an element have in common?
What type of bond results from a partial positive charge on hydrogen?
What type of bond results from a partial positive charge on hydrogen?
