What was the normal perception of a scientist up until the seventeenth century

Some medications slow a person's nervous system. These drugs are often labeled "may cause drowsiness". Explain why a person needs to know about this side effect.

In a chemical reaction how does the mass of the reactants compare with the mass of the products?

In most elements the valence shell holds a maximum of how many electrons

Determine the number of molecules present in 4.56 moles of nitrogen (n2).

Natalie accelerates her skateboard along a straight path from 4 m/s to 0 m/s in 25.0 s. Find the acceleration. -6.25 m/s2 -0.16 m/s2 0.16 m/s2 6.25 m/s2

Define "Homoglycan" and "Heteroglycan" and give an example of each

If you have 200 grams of iodine how many atoms do you have?

Sea salt is formed by natural evaporation of ocean water and contains 98% sodium chloride. The remaining 2% are natural minerals such as iron and sulfur. Consider a 84.7-g sample of sea salt.

Which element in group 15 is the strongest metallic character?

Can neptune sustain life?