1. A theory and a hypothesis are different in that:
A. you must have a theory before you can form a hypothesis.
B. a theory is developed as a result of broad agreement among scientists and a hypothesis is a much less substantiated idea.
C. a theory is much easier to disprove than a hypothesis.
D. a theory can never be disproved while a hypothesis can.
is it A
2. A covalent bond is:
A. the attraction that one atom has for another atom.
B. the attraction between two atoms, formed by the sharing of electrons.
C. formed between the positive charge of a hydrogen atom in one molecule and the negative charge of a nitrogen atom in another nearby molecule.
D. the attraction between a positive ion and a negative ion.
is it A
1. Correct.
2. Wrong.
1. The correct answer is B. A theory is developed as a result of broad agreement among scientists, and it is a well-substantiated explanation based on evidence and observations. On the other hand, a hypothesis is a proposed explanation for a phenomenon or a prediction about the outcome of an experiment. It is a tentative idea that requires further testing and evidence to support or refute it. Therefore, it is not necessary to have a theory before forming a hypothesis.
To arrive at this answer, you can eliminate option A because it incorrectly suggests that a theory must come before a hypothesis. Option C is also incorrect because it incorrectly states that a theory is easier to disprove than a hypothesis. Option D is incorrect because both a theory and a hypothesis can be disproved. This leaves option B as the correct choice, as it accurately describes the difference between a theory and a hypothesis.
2. The correct answer is B. A covalent bond is the attraction between two atoms that is formed by the sharing of electrons. In a covalent bond, atoms share one or more pairs of electrons in their outermost energy levels, resulting in a stable configuration. This type of bond is commonly found in molecules where two nonmetal atoms share electrons to achieve a full outer electron shell.
To determine this answer, you can eliminate option A because it incorrectly defines the attraction between atoms as an atom's attraction for another atom. Option C can be eliminated because it describes a specific type of bond (Hydrogen bonding) and not covalent bonding in general. Option D can also be eliminated because it describes an ionic bond, which involves the attraction between positive and negative ions, not the sharing of electrons between atoms. This leaves option B as the correct choice.