4. The difference between an atom and and element is
a. an element is made of atoms
b. atoms are made of elements
c. atoms are held together by covalent bonds
d. none of the above
C?
6. Which of the following is NOT an organic compound?
a. ATP molecule
b. saturated fatty acid
c. monosaccharide
d. ammonia
not sure...
7. Carbohydrates and lipids have many carbon-hydrogen bonds; therefore they both
a. store energy in these bonds
b. are easily dissolved in water
c. dissolve only in vinegar
d. exist only in cells of plants
A?
8. All organic compounds contain the element
a. carbon
b. nitrogen
c. calcium
d. sodium
A?
Thanks
-MC
4. atoms are the basic structure of an element.
6. Organic molecules contain carbon.
7. correct
8. Duh
Thank you so much!
Just want to make sure, 4 is A?
Thanks
-MC
yes, 4a
4. The difference between an atom and an element is that an element is made up of atoms. So, the correct answer is a. An element is made of atoms.
To understand this, we need to know that atoms are the basic building blocks of matter. They are the smallest unit of an element that retains the chemical properties of that element. An element, on the other hand, is a substance made up of only one type of atom.
6. To determine which of the options is NOT an organic compound, we need to understand what organic compounds are. Organic compounds are compounds that contain carbon atoms bonded to other elements such as hydrogen, oxygen, and nitrogen. They are commonly found in living organisms.
Looking at the options:
a. ATP molecule: ATP (adenosine triphosphate) is an organic compound as it contains carbon, hydrogen, oxygen, nitrogen, and phosphorous atoms. It is a molecule involved in energy transfer within cells.
b. Saturated fatty acid: Fatty acids are organic compounds that consist of a chain of carbon atoms bonded to hydrogen atoms. Saturated fatty acids only have single bonds between carbon atoms and are commonly found in animal fats and some plant oils. It is an organic compound.
c. Monosaccharide: Monosaccharides are simple sugars and are also organic compounds. They are the building blocks of carbohydrates.
d. Ammonia: Ammonia (NH3) is not an organic compound. It consists of nitrogen and hydrogen atoms, but it does not contain carbon. Therefore, the correct answer is d. Ammonia.
7. Carbohydrates and lipids are both organic compounds that have many carbon-hydrogen bonds. These bonds are a source of energy. Therefore, the correct answer is a. Both carbohydrates and lipids store energy in these bonds.
Carbohydrates, such as sugars and starches, are important sources of energy in living organisms. They contain carbon, hydrogen, and oxygen, and many of their chemical bonds store energy.
Lipids, such as fats and oils, also contain carbon, hydrogen, and oxygen, but they have a higher proportion of carbon and hydrogen compared to oxygen. Lipids are a concentrated source of energy and are used for energy storage in the body.
Neither carbohydrates nor lipids dissolve only in vinegar (option c) or exist only in cells of plants (option d), so options b and c are incorrect.
8. To determine which element is present in all organic compounds, we need to know the definition of organic compounds. Organic compounds contain carbon atoms bonded to other elements such as hydrogen, oxygen, and nitrogen.
Among the given options:
a. Carbon: Carbon is indeed the element that is present in all organic compounds. This is because carbon has unique bonding properties that allow it to form stable covalent bonds with other carbon atoms and a variety of other elements.
b. Nitrogen, c. Calcium, and d. Sodium: While nitrogen is often found in organic compounds, not all organic compounds contain nitrogen. Calcium and sodium, on the other hand, are not typically found in organic compounds. Therefore, the correct answer is a. carbon.
So, the correct answers are:
4. a. an element is made of atoms
6. d. ammonia
7. a. store energy in these bonds
8. a. carbon