Biology A Unit 1: Lessons 1-5 questionsa nd answers 2023/24

Biology A Unit 1: Lessons 1-5 questionsa nd answers 2023/24 Lesson 1: - Lesson 1: Which of the following statements describes a proton of an atom? - has a positive charge and is located in the nucleus Study the model. This model shows an atom with two neutrons, one proton, and one electron. Which option shows the correct electrical charges? - 2 blank red circles 1 yellow circle with P+ 1 blue circle with E- How is a carbon atom represented? - Circle with a "C" on it This element is an essential atom in the structure of proteins. Without this element, the body would be unable to make the proteins it needs to function properly. What element is this? - nitrogen What element has the symbol N? - nitrogen What is an atom? - the smallest unit of matter that has the chemical properties of an element What is a neutron? - a neutral particle that is in the nucleus of an atom Which describes electrons? - Electrons move at very fast speeds around the nucleus of an atom. Study the image What does this model represent? - an oxygen atom What are some functions of calcium? Select all that apply. - helping with muscle function making teeth strong What is the symbol for the element potassium? - K How is a hydrogen atom represented? - Circle with an "H" in it Study the atomic model. What is the correct labeling for the atom? - A—nucleus, B—proton, C—neutron D—electron This element can form a wide variety of substances, including long chains. The different substances it forms are central to the molecules found in living things. What element is this? - carbon Lesson 2: - Lesson 2: The chemical formula for calcium carbonate is CaCO3. How many different elements does a molecule of calcium carbonate have? - three Water molecules have two atoms attached to a third central atom, forming an angle. Which ball-and-stick model correctly shows this molecule? - Red middle ball with 2 smaller white balls attached to both sides Which statements are true about ions? Select all that apply. - Anions have more electrons than protons, giving them a negative charge. Cations have more protons than electrons, giving them a positive charge. The attraction between atoms with opposite electrical charges forms what type of bond? - ionic bond Which of the following are atomic ions? Select all that apply. - Cl-