Hi i have 3 questions I need help with please.
Electrons are found
A) in the nucleus of an atom.
B) only in complex molecules.
C) in a shell that surrounds the atom’s nucleus.
D) in both the nucleus and inner shell of an atom.
I think it's D.
Individual water molecules are pulled toward each other by _______ bonds.
A) covalent
B) hydrogen
C) peptide
D) ionic
I'm like 95% sure it's Covalent, but i know water molecules have hydrogen in them so I don't know if it's B then.
When you place a piece of red meat on a hot barbeque, it slowly changes from soft to firm. Meat is primarily made of proteins. Which of the following might account for the change in meat texture during cooking?
A) The heat causes the cells in the meat to produce more protein.
B) The heat causes the chemical bonds to form between the proteins and nucleic acids in the meat.
C) The heat from the barbeque converts proteins into lipids.
D) The addition of heat causes proteins to lose their three-dimensional shape and link together.
This one I'm leaning towards D, but then again I really don't know. Thank you.
Ok can someone else help me please, I've looked at many of those links already and I need to know if my answers are correct. Not trying to be rude but I really need to know if i got these right. Thank you.
Let's go through each question one by one and I'll explain how to arrive at the correct answers.
1. Electrons are found in an atom's:
A) nucleus
B) only in complex molecules
C) shell surrounding the nucleus
D) both the nucleus and inner shell
To determine the correct answer, we need to recall the basic structure of an atom. An atom consists of a nucleus at its center, which contains protons and neutrons, and electrons that orbit around the nucleus in energy levels or shells. Based on this, we can eliminate options A and D because electrons are not found in the nucleus. We can also eliminate option B because electrons are not limited to complex molecules. Therefore, the correct answer is C - electrons are found in a shell that surrounds the atom's nucleus.
2. Individual water molecules are pulled toward each other by _______ bonds:
A) covalent
B) hydrogen
C) peptide
D) ionic
To determine the appropriate bond between water molecules, we need to consider the nature of water and the interactions between its atoms. Water molecules are formed by covalent bonds between the oxygen atom and two hydrogen atoms. However, the intermolecular forces that hold water molecules together are hydrogen bonds. Hydrogen bonding is a specialized type of dipole-dipole attraction, in which the slightly positive hydrogen atom of one water molecule is attracted to the slightly negative oxygen atom of another water molecule. Therefore, the correct answer is B - water molecules are pulled toward each other by hydrogen bonds.
3. When red meat is cooked on a hot barbeque, it changes from soft to firm. Which of the following might account for this change in texture?
A) Heat causes the cells in the meat to produce more protein.
B) Heat causes the chemical bonds to form between proteins and nucleic acids in the meat.
C) Heat from the barbeque converts proteins into lipids.
D) Addition of heat causes proteins to lose their three-dimensional shape and link together.
To determine the correct answer, we need to think about the effect of heat on protein structures. Proteins are complex molecules composed of amino acids, and their three-dimensional shape is vital for their function. When proteins are subjected to heat, they can undergo a process called denaturation, where they lose their three-dimensional shape due to disruption of intra and intermolecular forces. This can result in the proteins linking together, leading to a firmer texture. Therefore, the correct answer is D - the addition of heat causes proteins to lose their three-dimensional shape and link together.
To summarize:
1. Electrons are found in a shell that surrounds the atom's nucleus (option C).
2. Individual water molecules are pulled toward each other by hydrogen bonds (option B).
3. The addition of heat causes proteins to lose their three-dimensional shape and link together (option D).
I hope this explanation helps! Let me know if you have any further questions.