Answer:
Explanation:
1. Change object motion - unbalanced force
2. Push or pull - Balanced forces do not cause a change in motion. When balanced forces act on an object at rest, the object will not move. If you push against a wall, the wall pushes back with an equal but opposite force. Neither you nor the wall will move. Forces that cause a change in the motion of an object are unbalanced forces. So if object move it is unbalanced.
3. Have direction - unbalanced force
4. Do not change objects motion - balanced force
5. Net force does not =0 - unbalanced force
6.net force =0 - balanced force
Answer:
-2,438 J energy is released
Heat energy is released
Explanation:
The formula for energy absorbed or released is Q = mT(Cp)
Get temperature in degrees T = 21 - 63 = -42°C
Mass of the cooling cooper m = 150g
Specific heat of copper Cp = 0.387J/g-°C
Put all the above parameters into the formula for energy absorbed or released
Q = mT(Cp)
= 150 x -42(0.387)
= -2438J same as -2.438 KJ
-2438J energy is released
Lewis structure cannot show the numbers of valences
Answer:
The electron configuration of magnesium is [Ne] 3s 2. It is an s block element, and it occurs as a solid at standard temperature and pressure. It is a shiny grey metal. The melting point and boiling points are 650 °C and 1091 °C respectively. The most common and stable oxidation state is +2, but it can form +1 oxidation state as well. In writing the electron configuration for Magnesium the first two electrons will go in the 1s orbital. Since 1s can only hold two electrons the next 2 electrons for magnesium go in the 2s orbital. The nex six electrons will go in the 2p orbital. The p orbital can hold up to six electrons. We'll put six in the 2p orbital and then put the remaining two electrons in the 3s. Therefore the Magnesium electron configuration will be 1s22s22p63s2.
Explanation: