Answer:
If you increase the concentration of a reactant, there will be more of the chemical present. More reactant particles moving together allow more collisions to happen and so the reaction rate is increased. The higher the concentration of reactants, the faster the rate of a reaction will be.
The answer is
• AI +O2 = AI2O3 :)
Polar covalent, it is what happens when there is unequal bond between two atoms, where one has a slightly negative charge and one has a slightly positive charge.
Answer:

Explanation:
Mass and weight are quite different terms .
Weight is defined as the amount of force exerted on the earth due to our mass and gravity of acceleration.

Given that the mass is 90 kg and gravity of acceleration of earth is 9.82 m/s^2.
So weight will be

So this is the weight of the 90kg man standing on earth.
the answer is A.) the moon is orbiting the earth once per month
its the only logical answer, the others are either impossible or illogical