Answer:
The correct answer is C (sodium chloride which is a salt human)
Explanation:
The sodium chloride whose formula is NaCl, corresponds to an ionic compound formed by a metal (Na) and a nonmetal (Cl). It corresponds to an inorganic substance, since it does not have carbon. Organic compounds are those that have carbon (example: glucose, methane, etc.)
Answer:
Plants take carbon dioxide from the air and use it to make food.
Explanation:
To get the empirical formula of this compound, we take a basis of 100 grams which means each percentage is equivalent to 1 gram. Hence there is 32.39 grams sodium, 22. 53 grams sulfur and 45.07 grams oxygen. We convert each mass to their moles by dividing by their respective molar mass. Na: 1.408, S:0.704 and O:2.82. divide each with the lowest: Na: 2: S: 1 and O:4. Hence the formula is Na2SO4.
Answer:
a: chemical change because the change cannot be reversed.
b: physical change because the action can be reversed.
c: chemical change.
d:chemical change.
any change that cannot be reversed is a chemical change and any change that can be reversed is a physical change.
