Explanation

When an acid reacts with a carbonate, it produces salt, water, and carbon dioxide as products.

A general reaction is:

Acid + Carbonate → Salt + Water + CO₂

Example: HCl + CaCO₃ → CaCl₂ + H₂O + CO₂

Explanation

According to the law of conservation of mass, the total mass of reactants equals the total mass of products in a chemical reaction.

Since no atoms are lost or gained, the mass of Fe₂O₃ (product) remains 320 grams, the same as the reactants.

Explanation

6CO₂ + 6H₂O → C₆H₁₂O₆ + 7O₂

The given reaction is the photosynthesis equation, where carbon dioxide and water form glucose and oxygen.

To balance oxygen atoms, the reaction requires 6 oxygen molecules (O₂), which contain 12 oxygen atoms on both sides.

Explanation

Diamond is a non-metal with a high-density.

Graphite: A non-metal but has a lower density (~2.2 g/cm³).

Hydrogen: The lightest element with very low density (~0.000089 g/cm³).

Helium: Also very low density (~0.00018 g/cm³).

Diamond: A non-metal form of carbon with high density (~3.5 g/cm³).

Iron: A metal, so not a valid choice for a non-metal category.

Explanation

Metals are opaque, meaning they do not allow light to pass through.

They are malleable (can be hammered into thin sheets) and lustrous (shiny in appearance).