Answer and explanation;
-Phosphorous can be prepared from calcium phosphate by the following reaction: 2Ca3(PO4)2 + 6SiO2 + 10C -----> 6CaSi03 + P4 + 10CO
Phosphorite is a mineral that contains Ca3(PO4)2 plus other non phosphorous containing compounds.
-If the phosphorite sample is 75% Ca3(PO4)2 by mass, then;
mass of Ca3(PO4)2 is given by; 0.75 * (1000 g) = 750g
MM Ca3(PO4)2 = 310.19 g/mol
thus, Number of moles of Ca3(PO4)2;
= 750g / 310.19 g/mol
= 2.42 moles of Ca3(PO4)2 From the equation;
(2 mol Ca3(PO4)2 = 1 mol P4) Thus; moles of P4 will be;
=2.42 mol Ca3(PO4)2 * (1 mol P4 / 2 mol Ca3(PO4)2)
= 1.21 moles of P4 Mass of P4 will be;
=1.21 mol P4 * ( 4 x 30.974) g/mol
= 1.21 mol P4 * 123.896 g/mol
= 150 g P4. (2 sf)
Hence;
1.5 x10^(2) g P4 are produced from 1.0 kg Phosphorite mineral containing 75% Ca3(PO4)2.
b. A scientific law describes what occurs every time in a situation.
c. A scientific law is constantly modified.
d. A scientific law is developed without experimentation.
The correct answer is B.
scientific law which describes what occurs every time in a situation. Scientific law always applies under same condition.
Laws differs from scientific theory because they does not posit explanation of phenomena.
Different laws takes mathematical forms. Scientific law is being associated with natural science but social sciences also contains laws.
A good example of scientific law in social sciences is Zipf's law.
Answer:
B. a law is a proven fact that cannot be changed.
Explanation:
c. rearranged.
b. destroyed.
d. neutralized.
In chemical reactions, atoms are rearranged to form new substances.
In chemical reactions, atoms are rearranged.
Atoms are the fundamental building blocks of matter, and they cannot be created or destroyed in a chemical reaction. Instead, the atoms that make up the reactants rearrange themselves to form the products of the reaction.
For example, in the reaction between hydrogen gas (H2) and oxygen gas (O2) to form water (H2O), the atoms in the hydrogen and oxygen gases rearrange to form the water molecules. Thus we can correctly predict the arrangement of atoms as described above.
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b. Products are favored over reactants in the reaction.
c. Reactants are favored over products in the reaction.
d. All of the reactants have turned into products in the reaction.
If Keq equals 1, this means the reaction is at equilibrium and neither the reactants nor the products are favored. The concentrations of both remain constant over time.
When Keq = 1, it implies that the reaction is at equilibrium and neither the reactants nor the products are favored in the reaction. So, the correct answer to your question is option a: Products and reactants are equally favored in the reaction.
In this situation, the concentrations of products and reactants remain constant over time because the rate of the forward reaction equals the rate of the reverse reaction.
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For a chemical equilibrium, Keq = 1 indicates that neither reactants nor products are favored; rather, they are present in roughly equal amounts at equilibrium. So the correct answer is Option C.
If Keq = 1 for a chemical equilibrium, it means that products and reactants are equally favored in the reaction. In other words, neither the reactants nor the products are favored when the reaction reaches equilibrium. Equilibrium constants help us understand the extent to which a reaction occurs. When Keq is greater than 1, the concentration of products at equilibrium is greater than the concentration of reactants, suggesting a product-favored reaction. Conversely, when Keq is less than 1, the concentration of reactants is higher, indicating a reactant-favored reaction. When Keq is equal to 1, it implies that the concentrations of reactants and products are roughly equal at equilibrium, reflecting a state of balance in the chemical system.
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The answer is: the type of bonding among the particles.
For example, calcium oxide (CaO) has ionic bonds between calcium cations (Ca²⁺) and oxygen anions (O²⁻).
Because it has strong ionic bonds, it has high melting point (around 2600°C).
Ionic bond is the electrostatic attraction between oppositely charged ions (cations and anions).
Amount of energy required to change 1 gram of material from the solid to the liquid state at its melting point
(2) different molecular structures and different properties
(3) identical molecular structures and identical properties
(4) identical molecular structures and different properties
Answer:
different molecular structures and different properties
Explanation:
The two forms of oxygen, O2(g) and O3(g) have different molecular structures and different properties