Only A. Formation of a gas indicates a chemical reaction.
The other three choices are all physical changes.
The density of crystal is 2.65 g / mL
we know that
Density = Mass / Volume
So volume occupied = Mass / density
Mass of crystal = 4.46 g
So volume occupied by crystal = 4.46 / 2.65 = 1.68 mL
As the graduated cylinder contains water upto 25.0 mL
So if we immerse the crystal in that cylinder the water level will rise to 25+1.68 = 26.68mL
so the new read will be 26. 68 mL
Hydrogen atoms one outer electron so would be placed in group 1. However all group 1 elements are metals and elements in the same group have similar properties. Hydrogen is a non-metal and does not behave in the same way as the other group 1 elements, so that is why it is on its own.
Answer:
75 Newton
Explanation:
In order to find the force of the object, you must remember that the equation N = (mass x acceleration). Therefore meaning you would divide 300 kilograms, <em>the mass, </em>by 4 meters per second (squared), <em>the acceleration.</em>