21 Lily investigates the containers of water shown below. Lily places container 1 in the middle of container 2 and measures the temperature of the
water in each container after 30 minutes.
Before
After 30 minutes
container 1: 30°C
container 2: 70°C
Which are the most likely temperatures after 30 minutes?
A. water in container 1: 70°C
water in container 2: 30°C
B. water in container 1: 50°C
water in container 2: 50°C
C. water in container 1: 40°C
water in container 2: 100°C
D. water in container 1: 22°C
water in container 2: 20°C

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.  

geosphere and hydrosphere.

this is because the geosphere has to do with geological events, while the hydrosphere controls all water on earth.

weight of any object is given by

w = m*g

where m is mass of the object and g is the acceleration due to gravity.

for earth the value of g is 9.8 m/s^2 so

w=117.6 n m=12 g=?

117.6=12g => g=9.8 m/s^2

which is the force of gravity on earth.

the answers are

c and c