Anything which changes the composition of starting material is a chemical property or chemical change. For example: you bake cake or cook food the heat changes composition of these. So cooking is a chemical change.
But evaporation of water is a physical change because even after evaporating it is still water molecules not changed to something else.
Combustion of any substance is burning of any substance in air. Combustion is actually the burning of a substance with oxygen in air. So, when a substance undergoes combustion it changes in it’s composition.
COMBUSTION IS A CHEMICAL CHANGE
Answer:
The formula mass of any compound is described in units of amu.
Explanation:
Molecular formula is the actual number of atoms of each element in the compound.
The mass of one molecule of the compound is known as formula mass. Thus, the unit of formula mass is amu.
For example, sodium chloride has a molecular formula of NaCl. The formula mass of NaCl is 58.44 amu.
<u>Thus, the formula mass of any compound is described in units of amu.</u>
Answer:
Electrostatic attraction between oppositely charged ions
Explanation:
involve the formation of an octet of electrons in their valence shells, except for hydrogen which needs a duet of electrons
Answer:
C.) Alpha, beta, and gamma particles
Explanation:
A dense shield of aluminium can protect Cole from all the listed types of radiation produced from the radioactive particles.
A radioactive protector has very unique and specie ability to contain and prevent the movement of radiations of any types from going into the body.
The strongest and most penetrating radiations are the gamma rays. Any material that can prevent the movement of these rays can halt alpha and beta particles too.
An aluminium shield is made up of multiple layers of aluminium stacked together and it provides enough resistance.
