The correct answer is answer choice C, three. In the formula Ca3 (P O4)2, there are 3 atoms of calcium (Ca), 2 atoms of phosphorus (P), and 8 atoms of oxygen (O). You can tell this by looking at the subscripts (or numbers, in this case, since you can't type subscripts). The subscript applies to the number directly beside it. Furthermore, if you have parentheses with a number beside it, just distribute. In this problem, we have (P O4)2.
(P O4) 2 Given
P2 O8 Distribute
We now have 2 atoms of phosphorus and 8 atoms of oxygen.
This problem has decided to be nice and just ask for calcium, so we don't have to distribute. All you have to do for this problem is look at the subscript beside Ca, which is 3. Therefore, the correct answer is C.
Answer:
Newton's third law
Explanation:
A fish swimming uses its fins to push the water backward making it swim forward is obeying Newton's third law of motion.
<em>Newton's third law of motion states that "action and reaction are equal and opposite". </em>
When the fish uses its fin to push the water backward, it reacts by being propelled in the opposite direction which is in the forward sense.
The third law is clear indicator that forces are always in pairs. As the fish swims, a net force between the oppositely directed forces do not cancel out.
<span>The earths plates move by 'Ridge-Push' and 'Slab Pull'. At constructive plates margins, lava is extruded and new crust forms as the convection pushes the hot magma though and the slab pull is where the dense subducted plate pulls the rest of the plate along. That is the very basics of what happens.
Lamp A - Off - The lava is cold, and therefore does not flow or convect.
Lamp B - On - The lava at the bottom by the light is being heated, as it heats, it gets less dense and rises to the top. When at the top,it cools down, and gets more dense and then falls back to the bottom again. Convection.
The heat source of the lava lamp is the light giving heat energy. The heat source in the earth is the core, and the radioactive processes (Mainly radioactive decay) that occurs within it.
The lava in the lamp represents the earths mantle. The floating pieces are trying to be the earths crustal plates, and they would move over the lava (earths mantle) due to the convection.</span>