Question

Jake collected samples of two substances while he was out walking. After taking the samples home, he ran tests and found that one substance is slippery and conducts electricity in water. These properties made Jake conclude that the substance is probably . The other substance continuously made bubbles of hydrogen gas when Jake dropped magnesium into an aqueous solution of the substance. Jake concluded that the second substance is probably .

Answer 1

Answer: The substance which is slippery and conducts electricity in water is base.

The substance which continuously made bubbles of hydrogen gas when Jake dropped magnesium into an aqueous solution of the substance is acid.

Step-by-step explanation:

1. An acid is defined as a substance which dissociates to give
`H^+` ions when dissolved in water.

They conduct electricity when dissolved in water due to the presence of ions.

Acids are sour in taste.

Acids react with metals to give hydrogen gas.

When magnesium is treated with a strong acid such as
`HCl` ,magnesium being more reactive than hydrogen displaces hydrogen from its salt solution and thus produce magnesium chloride and hydrogen gas.

`Mg+2HCl\rightarrow MgCl_2+H_2`

2. A base is defined as a substance which dissociates to give
`OH^-` when dissolved in water.

They conduct electricity when dissolved in water due to the presence of ions.

Bases are slippery in nature.

Thus we can conclude that the substance which is slippery and conducts electricity in water is base and the substance which continuously made bubbles of hydrogen gas when Jake dropped magnesium into an aqueous solution of the substance is acid.

Answer 2

The answer is: first substance is base and second is acid.

Bases, for example solution of sodium hydroxide (NaOH) feels slipery.

Sodium hydroxide dissociation in water: NaOH(aq) → Na⁺(aq) + OH⁻(aq).

Ionic compounds are good good electricity and heat conductors, because ionic compounds have mobile ions (cations and anions) that are able to transfer electrical charge.

In second reaction, magnesium is oxidized from oxidation number 0 to +2 and hydrogen is reduced from +1 to 0 (hydrogen gas).