Table of Contents
Does a given compound always has the same?
A compound always has the same elements in the same proportions. For example, carbon dioxide always has two atoms of oxygen for each atom of carbon, and water always has two atoms of hydrogen for each atom of oxygen. A compound always has the same composition throughout.
Can a compound be made of the same element?
The molecule can consist of atoms of the same element, or atoms of different elements. Compounds are (in the chemical sense of the term) made of two or more elements. This means a lot of molecules (like H2O) are considered compounds (though H2 is not).
Which law states that a compound is always composed of the same elements in the same proportion by mass?
law of definite proportions, statement that every chemical compound contains fixed and constant proportions (by mass) of its constituent elements.
What is a compound always made up of?
Compounds and Molecules. A compound is a unique substance that consists of two or more elements combined in fixed proportions. This means that the composition of a compound is always the same.
What is the most important compound in the human body?
Carbon is contained in all organic compounds, which is why carbon is the second most abundant element in the body, accounting for about 18% of body mass. Carbon is found in proteins, carbohydrates, lipids, and nucleic acids….Elements in the Human Body.
| Element | Percent by Mass |
|---|---|
| Oxygen | 65 |
| Carbon | 18 |
| Hydrogen | 10 |
| Nitrogen | 3 |
What is the basic form of matter that Cannot be broken down?
Elements are the simplest form of matter; cannot be broken down further by either physical or chemical means. Atoms are the smallest particles of matter that can enter into chemical reactions. Elements are composed of atoms.
Is 2 of the same element a compound?
When two or more atoms of different elements join together, we call it a compound. That is because a molecule can be made up of two atoms of the same kind, as when two oxygen atoms bind together to make an oxygen molecule. However, all compounds are made up of two or more different types of atoms.
Can a compound be separated by physical means?
A compound is a pure substance composed of two or more different atoms chemically bonded to one another. That means that it can not be separated into its constituents by mechanical or physical means and only can be destroyed by chemical means.
What is law of constant proportion Class 9?
Law of constant proportion states that a chemical compound always contains exactly the same proportion of elements by mass. If we take some mass of water, 8/9 of its mass will be oxygen and 1/9 will be hydrogen.
What are the 10 examples of compound?
Compounds Examples
- Water – Formula: H2O = Hydrogen2 + Oxygen.
- Hydrogen Peroxide – Formula: H2O2 = Hydrogen2 + Oxygen2
- Salt – Formula: NaCl = Sodium + Chlorine.
- Baking Soda – Formula: NaHCO3 = Sodium + Hydrogen + Carbon + Oxygen3
- Octane – Formula: C8H18 = Carbon8 + Hydrogen18
What is the heaviest element in the human body?
Iodine
Iodine is the heaviest element required by the human body. Copper is a component of many enzymes.