Quartz is a substance because the material has uniform properties throughout and is held together via chemical bonds.
Answer is: this is synthesis reaction.<span>
</span>Chemical reaction: Ba + F₂ → BaF₂.
Synthesis reaction<span> is a type of reaction in which multiple reactants combine to form a single product.
</span>In barium fluoride, barium has oxidation number +2 and fluorine has oxidation number -1, so compound has neutral charge.
Formula for density is mass / volume.
100 ml is volume. 76.5g of cooking oil is
the mass.
Therefore
76.5/100 = .765g/ml
Answer:
The ages of dinosaur fossils are determined by the layer of rock in which they are ... you can see the complete geologic column, how do scientists know it exists? ... laid down over 542 million years, for an average of 49,272 years per foot of rock. .... dinosaurs lived in shallow water because it would help support their weight
Explanation:
