I'm gonna go ahead and guess, and say its B.
Answer:
Solar power take less energy compare to other and its charge by sun According to me solar energy is best way to save energy in future
Answer:
The energy that is required for the process is:
6230.7 J + 42957 J + 9715.2 J = <u>58902.9 joules</u>
Explanation:
This is a calorimetry problem:
Q = m . C . ΔT
Q = heat; m = mas; C is the specific heat and
ΔT = Final T° - Initial T°
Q = C lat . m
Q = Heat
m = mass
C lar = Latent heat of fusion
First of all we calculate the heat for ice, before it takes the melting point. (from -23°C to 0°C)
Q = 129 g . 2.10 J/g°C . (0°C - (-23°C)
Q = 129 g . 2.10 J/g°C . 23°C → 6230.7 joules
Then, the ice has melted. To be melted and change the state it required:
Q = C lat . m
Q = 333 J/°C . 129 g → 42957 joules
And in the end, we have water that changed its T° from O°C to 18°C
Q = 129 g . 4.184 J/g °C . (18°C - 0°C)
Q = 9715.2 Joules
The energy that is required for the process is:
6230.7 J + 42957 J + 9715.2 J = 58902.9 joules
Sand dunes would be created due to the mixture falling on each other
x
Answer:
Barium has the same number of valence electrons as calcium
Explanation:
Valence electrons is the number of electrons of an atom on the outer shell.
Those valence electrons can participate in the formation of a chemical bond (if the outer shell is not closed); in a single covalent bond, both atoms in the bond contribute one valence electron in order to form a shared pair.
<u>Calcium</u> is an atom, part of group 2, called the alkaline earth metals. The alkaline earth metals have 2 valence electrons.
<u>Sulfur </u>is part of a group 16, called the chalcogens or oxygen family. Those atoms have 6 valence electrons. They can form a bound with atoms of group 2 such as calcium, but do not have the same number of valence electrons.
<u>Potassium</u> is part of group 1, called the alkali metals or lithium family. Those atoms have 1 valence electrons. That means Potassium do not have the same number of valence electrons like calcium.
<u>Neon</u> is part of group 18, the noble gasses. Those are stable atoms, which means they have 8 valence electrons. They do not have the same number of valence electrons like Calcium.
<u>Barium</u> an atom, part of group 2, called the alkaline earth metals. The alkaline earth metals have 2 valence electrons. Calcium is also part of this group.
This means barium has the same number of valence electrons as Calcium.
