Answer the following question given this paragraph: The ion concentration of neutral, pure water gives water a pH of 7 and sets the standard for defining acids and bases. Acids have a pH lower than 7, and bases have a pH higher than 7. Q: What is the ph level of neutral, pure water? Choices: - six and a half - five - six - seven A:
seven
Answer the following question given this paragraph: Prokaryotic cells are cells that lack a nucleus. The DNA in prokaryotic cells is in the cytoplasm, rather than enclosed within a nuclear membrane. All the organisms in the Bacteria and Archaea Domains have prokaryotic cells. No other organisms have this type of cell. Organisms with prokaryotic cells are called prokaryotes . They are all single-celled organisms. They were the first type of organisms to evolve. They are still the most numerous organisms today. Q: What significant part of the cell do prokaryotic cells lack? Choices: - a cell wall - a ribosome - mitochondrial dna - a nucleus A:
a nucleus
Q: Answer the following question given this paragraph: Water is a compound that consists of the elements hydrogen (H) and oxygen (O). Like other compounds, the smallest particles of water are called molecules. Each molecule of water (H 2 O) contains two atoms of hydrogen and one atom of oxygen. Q: What are the smallest particles of water called? Choices: - hydrogen - atoms - ions - molecules A:
A: molecules
Question: Answer the following question given this paragraph: A change of state occurs whenever matter changes from one state to another. Changes of state are physical changes in matter. They are reversible changes that do not change matter's chemical makeup or chemical properties. Q: What do you call reversible changes that do not change matter's chemical makeup or chemical properties? Choices: - potential changes - element changes - chemical changes - physical changes A:
Answer: physical changes
*Question*
Answer the following question given this paragraph: Different types of bacteria stain a different color when Gram stain is applied to them. This makes them easy to identify. Some stain purple and some stain red, as you can see in Figure below . The two types differ in their outer layers. This explains why they stain differently. Q: What is a gram stain used to identify ? Choices: - radioactivity - acids or bases - different types of liquids - different types of bacteria A:
**Answer**
different types of bacteria
*Question*
Answer the following question given this paragraph: A: Electric charges flow when they have electric potential energy. Potential energy is stored energy that an object has due to its position or shape. Q: What is the term for stored energy that an object has due to its position or shape? Choices: - kinetic energy - mechanical energy - vertical energy - potential energy A:
**Answer**
potential energy