"1. Atoms of different elements differ in which of the following ways? (1 point)

1 answer:

3 0

1) A. the have different protons.

The number of protons is the atomic number and this is how the products are ordered in the periodic table. Every element has different atomic number.

2) A. 8 p, 8 e and 8 n

The atomic number of O is 8, which means it has 8 protons. The number of protons must equal the number of electrons.

3) C. atoms bond with one another in a molecule.

That is what a molecule is: a group ot atoms bonded.

4) D. the bond results from the attractive forces of two opposite charges.

Ionic bonds are formed between ions, a positive ion (cation) and a negative ion (anion).

5) A. the physical and chemical properties of HCl are different from those of H2 and Cl2

You can check physical properties (density for example) and chemical properties (how they react with other elements) in some tables o textbooks.

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( pls help me) brainlest answer too

bonufazy [111]

4.) Heat is transferred through a piece of metal by _____.
conduction

Conduction happens when both items are in close contact. In a piece of metal. In this case, the heat transfers gradually into the other ends of the object. This makes the transfer rate is slow on a long object with a low surface area.

5.) Heat from the sun travels to earth by _____.
radiation

Sun energy comes from a reaction that will produce a light and heat and it is transferred to the earth by radiation. While conduction and convection need contact with the object, radiation doesn't. Radiation can travels a very long distance, that is why the heat could be delivered to the earth.


6.) Energy in a vacuum travels by ___.
radiation

One of the examples for energy travels in a vacuum would be sunlight. Sun and earth are separated by vacuum space which means there is no direct contact between earth and sun. That means conduction and convection are not possible.


7.) In a convection current _____.
C.)cool fluid is more dense, and therefore, sinks

Cool fluid have lower volume, thus become denser than warm fluid. Since its density higher than the warm fluid, it will sinks and moves toward the earth. The warm fluid also rises to replace the cool fluid.

8.) Nuclear reactions occurring in the Sun _____. Select all that apply.
generate light
generate heat
fuse atoms of hydrogen to make helium atoms

Sun is bright and hot, which means it produces light and heat. The reaction should be producing energy, not absorbing energy. The reaction that produces that energy would be the fusion reaction of hydrogen into helium.

9.) Which of the following statements is true?
C.)The sun's energy comes from the nuclear reactions of changing hydrogen into helium.
The sun reaction is right, it is forming helium using hydrogens.
Transfer of heat in liquid mostly happens because convection which need direct contact. But the heat can transfer by radiation too, so its a bit ambiguous.
Temperature represents the average kinetic energy of the molecule and it is different with heat/thermal energy.

3 0

3 years ago

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Consider the unbalanced chemical equation hf + al -> alf3 + h2. when coefficients are added to balance the equation, which tw

Mama L [17]

Answer:

Explanation:

because you need to add 2 to to hf to make it equal to h2

5 0

3 years ago

HELP ME PLSSSS USATP

melamori03 [73]