Answer:
The only option that has a true statement is hence only (ii) and (iv) are TRUE
Explanation:
The correct option is (ii) - Elements, such as lead, are made of tiny particles that mostly consist of open space.
for the first option (i) - Models are always wrong unless they are proved by a theory- This is not true because not all models are always wrong and they are not necessarily need to be proved by a theory to ascertain the veracity of the model, one such example is the Neil's bohr model of atom.
for the third option (iii) - The air you breathe is an example of a heterogeneous mixture. This is wrong because Air is a homogeneous mixture containing Nitrogen and Oxygen and other constituents as its composition.
for the last option (iv) - Because NH3 always contains the same relative numbers of atoms, it will always contain 4.6 g of nitrogen for every 1.0 g of hydrogen - this is also true as the amount contained is dependent on the number of atoms in the balanced equation for the production of ammonia.
No you can't because both Oxygens only have 6 valence electrons and they need 2 more valence electrons each
Answer:
C. 3
Explanation:
volume = length×width×height
3×3×3=27
The answer is D because the box b's force to the left is not being cancelled out and box d's force is trying to be cancelled out, but he has more force going up then down so he is moving up
