To measure the mass of a given powdered substance do the following:
1. Zero the weighing balance, that is, put the weigh balance at zero mark.
2. Put an empty weighing paper on the balance and take its reading. Record it as X1.
3. Use spatula to put the powder you want to measure on the weighing paper on the balance. Take your reading and record it as X2.
The mass of the powered is X2 - X1.
Answer:
Any element placed in a flame will change its color. Atoms are made of positively charged nuclei, about which negatively charged electrons move according to the laws of quantum mechanics. Quantum mechanics constrains them to appear in various distinct patterns, called orbitals. (Orbitals are a lot like planetary orbits, but blurrier, so that you're never quite sure just where the electrons are.)
Left on their own, the electrons of an atom tend to relax into orbitals that leave the atom with the lowest possible energy--its ground state. Putting atoms into a flame, though, adds energy to the looser electrons farthest from the nucleus and pushes them into other orbitals. Eventually, these excited electrons drop back to where they ought to be, and in so doing, they release the energy they stored up as particles of light, called photons.
Explanation:
Answer:
1. right 2. left 3. left 4. left 5. left
Explanation:
1. N2 is a reactant, so adding more will push the reaction away from N2 which will be right, towards the products
2. treat heat as a product, so by increasing temp you increase heat and you push the reaction away from heat which will be left, towards the reactants
3. Adding NH3 will push the reaction away from it, so it'll move left, towards reactants
4. When you decrease pressure, the reaction will move to the side with more moles, since the left side has 4 moles and the right only has 2, it'll move left
5. by removing H2, the equillibrium will shift left in order to restore balance.