A campfire is a chemical reaction involving wood and oxygen from the air. In light of the law of conservation of mass, explain what happens to the mass of the wood during the reaction. How is mass conserved if the wood disappears?

Instructions:  Make sure to make your explanations precise and show your complete solutions.  Analyze situational problem/s involving chemical reactions and apply the Law of Mass Conservation.   Jan Baptista van Helmont (1579–1644) recorded the mass of a young willow tree and the soil in which the tree was planted. Five years later he found that the mass of soil had decreased by only 0.057 kg, while that of the tree had increased by 75 kg. During that period, he had added only water to the bucket in which the tree was planted. Helmont concluded that essentially all the mass gained by the tree had come from the water. Was this a valid conclusion? Explain. ______________________________________________________________________________________________   ______________________________________________________________________________________________   ______________________________________________________________________________________________

8. A mixture of sand and NH,Cl can be separated by method. 9. Define latent heat of fusion. Give its value for ice. 10. What is meant by atomicity of an element? Give some examples of polyatomic elements. 11. “All pure substances are homogenous. But all homogenous substances are not pure." Justify. 12. Distinguish between filtration and centrifugation. 13. Silver is a substance which expands on melting; so, its melting point when pressure is raised. 14. Give an example each for solid-liquid and solid- solid types of a homogenous mixture. 15. The atomicity of the element phosphorus is

It would be really hard to measure the mass of the foam explosion. How does knowing the amount of liquid they started with help predict how much foam there is? (a) The mass of the foam should be twice as much as the liquid they started with (b) the mass of the foam should be equal to the mass of the individual elements that were formed (c) the mass of the foam should be half the mass of the liquid they started with (d) the mass of the foam should be the same as the mass of the liquid they started with

The nature of the elemental matter depends on which factor in the atom and what factors are added to the elements because of the difference of that factor?

How many oxygen atoms are there in 6.31 kg of methane magnesium nitrate, Mg(NO3)2? Use the following atomic weights: Mg = 24.3 g/mol, N = 14.0 g/mol, O = 16.0 g/mol. Express your answer in two decimal places. Write the answer in scientific notation in the following manner: 1.00e25 (if the no. of atoms is 1.00 x 1025). Spaces are not allowed.

A sample of C, H, has 4.64 x 1024 H atoms. How many carbon atoms does the sample contain? number of carbon atoms: What is the total mass of the sample? mass: 21 Catoms g C₂H₂

Composition C-4 is a plastic explosive having a density of 1.05 g/cm3. Calculate the mass of a brick of C-4 measuring 82 mm x 100.0 mm x 165.0 mm.

When a chemical reaction occurs, atoms rearrange to form now compounds, but no new atoms are created nor are any destroyed This concept is called conservation of mass. Mass conservation can be seen in a balanced chemical equation where the numbers of each kind of atom are the same on both sides of the reaction arrow. The figure (Figure 1) shows the reaction of element A (lavender spheres) with element B (tan spheres). Write the balanced chemical equation for this reaction in terms of A and B. Express your answer as a chemical equation. When balancing chemical equations with polyatomic ions, it may help to balance the ion as a whole. For example, the ion PO_4^3 can be treated as a unit and balanced in both the reactants and the product, or you can break it down and balance each atom separately. Phosphoric acid reacts with magnesium hydroxide to produce magnesium phosphate and water via the following reaction: Balance the equation, then enter the coefficients, in order, in the answer…

What is the mass in grams of 1.37 × 1016 chromium atoms? Put your answer in box in scientific notation with one past the decimal in this format x.x*10^_X