Answer:
i) Protons and neutrons
ii) Mass number = 15
iii) Atomic number= 12
Explanation: i) The atom is composed of two parts: named as nucleus which contains neutrons and protons which contributes to most of the mass and there is extra nuclear part which consists of electrons which revolve around the nucleus. Thus subatomic particles are found in the nucleus of the atom are protons with positive charge and neutrons with no charge.
ii) Atomic number is equal to the number of protons or the number of electrons for a neutral atom and is specific to a particular element.
Mass number is the sum of number of protons and the number of neutrons.
Given : atomic number of oxygen = 8 = number of protons
Number of neutrons = 7
Thus mass number = number of protons + number of neutrons = 8+7= 15.
iii) Mass number = 25
Number of neutrons = 13
Mass number = number of protons + number of neutrons
25 = number of protons + 13
number of protons= 25-13 = 12
Thus atomic number = number of protons = 12
No, the solid can not be frozen water. This is because water has a melting point of 32 degrees Fahrenheit. Room temperature is well above 32 degrees, so the solid would have begun to melt. Since the solid was not melting, we can infer that it is not water.
Yes chemicals in clouds can cause rainstorms
Answer:
Explanation:
Solids are matters whose shape are usually fixed. They have a definite volume which be measured at any point. The particles of solids are usually arranged in an order manner or pattern based on their crystal lattices. Solid particles are tightly and closely packed together and are held by a very strong attractive force.
Liquids do not have a fixed shape. Liquids have a definite volume which can easily be determined. The particles of liquids are closely packed and held by a stronger attractive force than those of gases but less strong when compared solids.
Gases do not have a fixed volume or shape. They occupy any volume of space they are found in. Particle of gases are poorly packed and they are held by weak attraction forces between their particles.
Answer:
Explanation:
Boyle's law states that at constant temperature:
P
PV = constant
Where: P is the pressure of a given mass of gas, and V is its volume.
The bubble wrap has a confined volume of air at constant temperature. Since a gas is easily compressible, the volume of the gas in the wrap decreases with increasing pressure. This implies that there is an inverse proportion relation between the pressure on and volume of the air.
The bubble wrap pops when stepped onto or squeezed because the pressure is high and the volume can not be compressed further. Thus, the elastic limit of the seal is exceeded. This leads to an escape of the confined air.