-
Anonymous users2024-02-09It is often said that spinach is rich in iron, and the "iron" mentioned here does not exist in the form of elemental, molecular, atomic, ionic, etc., and the "iron in the crack" referred to here is an element that emphasizes the existence and has nothing to do with the specific form
Therefore, c
-
Anonymous users2024-02-08Spinach is rich in iron, and the "iron" here refers to the element, and it is present in the compound of the substance, not in the form of elemental substances, so a, c, d are wrong, and b is correct
Therefore, choose B
-
Anonymous users2024-02-07Answer B analysis: "Iron" in food, medicine, nutrition, mineral water and other substances does not exist in the form of elemental, molecule, atomic, etc., but refers to elements, which are usually described by elements and their mass (mass fraction).
Answer: The "iron" in spinach with code leak does not exist in the form of elemental, molecular, atomic, etc., and the "iron" referred to here is an element that emphasizes its existence, and has nothing to do with the specific form
Therefore, choose B Comment: This question is not very difficult, and the main test model answers the difference between elements and microscopic particles and substances, and deepening the understanding of the concept of elements is the key to correctly answering such questions
-
Anonymous users2024-02-06C test question analysis: matter is composed of elements, spinach contains rich iron, in the form of compounds in spinach, not in the form of elemental, molecule, atomic, refers to elements. Therefore, c
Comments: Understanding the relationship between molecules, atoms, ions, elements and matter, understanding the composition of matter and the knowledge of the composition of matter is the key to answering this question.
-
Anonymous users2024-02-05Spinach is rich in iron, and "iron" here refers to the element, while it is found in the compounds of the substance, not in the form of elemental substances
Therefore, c
-
Anonymous users2024-02-04Spinach is rich in iron, and "iron" here refers to the element, while it is found in the compounds of the substance, not in the form of elemental substances
Therefore, c
-
Anonymous users2024-02-03Spinach is rich in iron, and "iron" here refers to the element, while it is present in the compounds of the substance, not in the form of elemental substances
Therefore, choose D
-
Anonymous users2024-02-02Spinach is rich in iron, and "iron" here refers to the element, while it is found in the compounds of the substance, not in the form of elemental substances
Therefore, choose D
Online dating also has true feelings, and online dating also has true love!
Bonsai is eaten well with eggs.
In geography, water resources are usually freshwater resources that can be used directly by human beings.
Spinach and shrimp soup.
Ingredients. 360 grams of shrimp, 70 grams of spinach, appropriate amount of cooking wine, appropriate amount of salt, appropriate amount of monosodium glutamate. >>>More
Summary. Bathing and changing clothes frequently can effectively eliminate the static electricity accumulated on the surface of the human body. In people's daily life, sometimes due to clothing, climate, friction and other reasons, often cause the body to accumulate static electricity, and when suddenly touching metal, it will incur the pain of electric shock, and it can even cause some psychological pressure when it often occurs at a certain stage. >>>More