Answer: The statement is true
Explanation:
The half-life of a radioactive isotope is the time taken for half of the total number of atoms in a given sample of the isotope to decay.
For instance
The half-life of radium is 1622 years. This means that if we have 1000 radium atoms at the beginning, then at the end of 1622 years, 500 atoms would have disintegrated, leaving 500 undecayed radium atoms
Thus, the statement is true
Answer:
Phenolphthalein is a chemical compound with the formula C20H14O4 and is often written as "HIn" or "phph" in shorthand notation. Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colorless in acidic solutions and pink in basic solutions.
Physical properties of a substance include, solubility, boiling point, etc.
The correct matching of the physical properties with definition is as follows;
- Solubility - the ability of a substance to dissolve in another
- Boiling point - the temperature at which a liquid becomes a gas
- Density - the amount of mass in a given volume
- Buoyant force - the upward force on an object in a fluid
- Conductivity - the ability of a substance to transfer heat or electricity
Above, all the physical properties have been properly matched with the corresponding definitions.
Learn more: brainly.com/question/81085
Density is mass over volume
Density = 106g/23cm³ = 4.6g/cm³
