I believe the answer is 3 - He hypothesized that all substances can be broken down into a smallest part called the atom.
Answer:
Covalent Bonds are formed when two non-metals share electrons
Hope this helps
Answer:
Explanation:
lung air ways the mucus will clog it up causing asthma hope this helped :P
Answer : The mass of sample is, 267.5 grams.
Explanation :
Density : It is defined as the mass of a substance contained per unit volume.
Formula used :

Given:
Volume of Pb = 
Density of Pb = 
Now put all the given values in the above formula, we get the mass of Pb.


Therefore, the mass of sample is, 267.5 grams.
Molality is one way of expressing concentration for solutions. It has units of moles of solute per kg of solvent. From the given values, we easily calculate for the moles of solute by multiplying the mass of solvent to the molality. We do as follows:
moles solute = 0.3 (10) = 3 mol solute