Answer:
a) decrease
b) increase
c) decrease
Explanation:
a) The density of water <u>decreases</u> as water changes from liquid to steam.
The density of substances are higher when their molecules are very close to each other having strongest bonding forces. When water is change from liquid to steam it means water molecules are not close to each other as they are in liquid state because now water is changed into gaseous form and molecules are further apart from each other. Thus, density goes to decrease.
b) As the temperature increases, the rate of diffusion of a gas<u> increase.</u>
As temperature increases molecules gets more kinetic energy and rate of diffusion increases.
c) At constant volume, if the temperature of a gas is decreases, its pressure <u>decreases.</u>
According to Gay-Lussac Law,
The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.
Mathematical relationship:
P₁/T₁ = P₂/T₂
As temperature decreases its pressure also goes to decrease and vice versa.
Answer:
Add more batteries.
Explanation:
The more batteries there are in the electromagnet, the more steel/iron clips that the electromagnet can attract. Hence, this results in making the electromagnet stronger.
B. New atoms are formed as products.
Phosphorous has 5 valence electrons and so gaining 3 electrons will make it isoelectronic with the stable noble gas argon, and will produce the P3- ion
Answer:
95% Copper and 5% Zinc
Explanation:
Easy stuff read in the chemistry book...