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3 years ago

Which best describes heat?

Chemistry

2 answers:

lapo4ka [179]3 years ago

7 0

The correct answer is D. Energy that flows from a hot mug of tea to a cold hand

Explanation:

Heat refers to a type of energy that is the result of the motion of atoms in the matter; additionally, heat differs from other types of energy because this flows between objects or surfaces, usually as energy or heat flow from a hot surface to a colder one. Besides this, heat transference can occur due to conduction that involves direct contact of surfaces, radiation that involves electromagnetic waves or convection that involves movement of particles in liquids or gases. Thus, the statement that describes heat is " Energy that flows from a hot mug of tea to a cold hand" because this shows the flow of heat or energy from a hot surface to a colder one.

adelina 88 [10]3 years ago

3 0

The last option, "Energy that flows from a hot mug of tea to a cold hand." Hope this helps!

(This is because heat is the transfer of energy that you can well, feel. In simple terms. For this question and other like it you can do process of elimination because the only one that involves heat, is the last option.)

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Can u guys help on 22. It will only take a min.

Anni [7]

Answer:

Alpha > beta>gamma

Explanation:

Comparing only the three common types of ionizing radiation, alpha particles have the greatest mass. Alpha particles have approximately four times the mass of a proton or neutron and approximately 8,000 times the mass of a beta particle.

Gamma radiation, unlike alpha or beta, does not consist of any particles, instead consisting of a photon of energy being emitted from an unstable nucleus. Having no mass or charge, gamma radiation can travel much farther through air than alpha or beta, losing (on average) half its energy for every 500 feet.

7 0

3 years ago

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artcher [175]

Answer:

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Explanation:

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3 years ago

Write the molecular, ionic, and net ionic equations for the reaction of a: hcl with koh, b: hcho2 with lioh and c: n2h4 with hcl

igor_vitrenko [27]

Answer:

Here's what I get.

Explanation:

a. HCl + KOH

$\rm Molecular: KOH(aq)+ HCl(aq) \longrightarrow \, KCl(aq) + H_{2}O(l)\\\rm Ionic: K^{+}(aq) + OH^{-}(aq)+ H^{+}(aq) + Cl^{-}(aq) \longrightarrow \, K^{+}(aq)+ Cl^{-}(aq) + H_{2}O(l)\\\rm Net ionic: OH^{-}(aq)+ H^{+}(aq) \longrightarrow \, H_{2}O(l)\\$

b. HCHO₂ + LiOH

Only the first H in HCHO₂ is acidic

$\rm Molecular: HCHO_{2}(aq)+ LiOH(aq) \longrightarrow \, LiCHO_{2}(aq) + H_{2}O(l)\\\rm Ionic: HCHO_{2}(aq) + Li^{+}(aq) + OH^{-}(aq) \longrightarrow \, Li^{+}(aq)+ CHO_{2}^{-}(aq) + H_{2}O(l)\\\rm Net ionic: HCHO_{2}(aq) + OH^{-}(aq) \longrightarrow \, CHO_{2}^{-}(aq) + H_{2}O(l)\\$

c. N₂H₄ + HCl

Both N atoms in N₂H₄ are basic, so the compound reacts with 2 mol of HCl.

$\rm Molecular: N_{2}H_{4}(aq)+ 2HCl(aq) \longrightarrow \, N_{2}H_{6}Cl_{2}(aq) \\\rm Ionic: \qquad N_{2}H_{4} (aq) + 2H^{+}(aq) + 2Cl^{-}(aq) \longrightarrow \, N_{2}H_{6}^{+}(aq) + 2Cl^{-}(aq)\\\rm Net ionic: \ N_{2}H_{4} (aq) + 2H^{+}(aq) \longrightarrow \, N_{2}H_{6}^{+}(aq)\\$

6 0

4 years ago

PLZ HELP ASAP!!!

True [87]

Answer:

342.3 g/mol for sugar, 58.44 g/mol of salt, and 84.007 g/mol for baking soda.

Explanation:

This is so because of the formula of molar mass: Molar mass is the mass of a given substance divided by the amount of that substance, measured in g/mol.

Hope this helps :)

5 0

4 years ago

How many moles of ammonium ions are in 1.3 grams of ammonium carbonate?

Eva8 [605]

Molecular weight of (NH4)2 CO3 = 96 gm. 96 gm (NH4)2CO3 = 1 mol of (NH4)2CO3 = 2 moles of NH4. Therefore 1.3 gm of (NH4)2CO3 = 1.3x2/ 96 = 0.027 moles.

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4 years ago