Answer:
True
Explanation:
Elemental gold is a pure substance (if it is 24 carat). Gold used in jewelry is a mixture with such other metals as copper and nickel. Pure gold is rather soft, so it is mixed (alloyed) with other metals.
I believe the answer you ar elooking for is that the noble gases are in the rightmost column of the periodic table
Each element has one more outer electron than the element before it.
Answer:
A. Inflation pressure of the tyres
Explanation:
In an experiment, the independent variable is the variable that the experimenter changes or manipulates in order to induce a response in another variable called Dependent variable.
In this case in which an experiment was conducted on how inflation pressure of tyre affects a vehicle's maximum speed. The tyres of three different vans were used. The tyre of the first van were set at normal pressure of 35psi, the other van tyres were set at 40psi (overinflated) and 30psi (underinflated) respectively. This means that the INFLATION PRESSURES OF THE TYRES were the variable being changed, hence, is the INDEPENDENT VARIABLE.