2, Define the following. i. element ii. chemical bond iii. formula 3. How many atoms are present in a molecule? 4. When does a chemical reaction occur?
Answers
Answer:
Element- an element is a pure substance consisting only of atoms that all have the same numbers of protons in their nuclei.
Chemical bond- A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms.
Formula- A chemical formula is a way of presenting information about the chemical proportions of atoms that constitute a particular chemical compound or molecule, using chemical element symbols, numbers, and sometimes also other symbols, such as parentheses, dashes, brackets, commas and plus (+) and minus (−) signs.
group of two or more atoms held together by chemical bonds. So, minimum 2 atoms are required to form a molecule.
Reactions occur when two or more molecules interact and the molecules change. Bonds between atoms are broken and created to form new molecules.
these area the answer's given one by one to each of your answer dear
Answer:
- An element is a substance which cannot be spilt up into two or simpler substances by the means of chemical methods of applying heat, light or electric energy.
- A chemical bond is a formation of bond due to the electrostatic forces of attraction due to sharing of electrons or donating electrons.
- The definition of a formula is a group of mathematical symbols that express a relationship or that are used to solve a problem, or a way to make something
- Molecule: group of two or more atoms held together by chemical bonds. So, minimum 2 atoms are required to form a molecule.
- Reactions occur when two or more molecules interact and the molecules change. Bonds between atoms are broken and created to form new molecules.