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2 years ago

Compare the type of change that occurs when an iron bar rusts and when a substance freezes.

Chemistry

1 answer:

Ivanshal [37]2 years ago

5 0

Explanation:

when an iron bar rust is an example of a chemical change in which a new substance is formed and the change is not easily reversible.for iron to rust moisture and air must be present.while when a substance freezes,it can be easily reversed through melting and no new substance is formed.this change is termed a physical change.

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Apresentando a configuração eletrônica 1s2 2s2 2p6 3s2 3p4 um determinado elemento químico se mostra com forte tendência para:

Bess [88]

Answer:

Explanation:

To know what will happen, we need to know

the total number of electrons the element have.

This can be calculated by adding all the electrons together

That would be 2 + 2 + 6 + 2 + 4 = 16

This shows that the element is sulphur.

Now using the KLMN electronic configuration, sulphur has the shells 2,8,6 meaning there are 2 extra electrons needed for octet configuration to be achieved.

This makes option E the correct answer to the question

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3 years ago

1.What phase change is being observed when ice melts? *

OLga [1]

Answer:

1 melting

3 evaporationa

4 freezing point

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3 years ago

A brick measures 25 cm by 12 by 13 cm.what is the volume of the brick in cm^3?How many millimeters of water would this brick dis

Scilla [17]

25 cm x 12 cm x 13 cm => 3900 cm³

1 cm³ = 1 mL , therefore: 3900 x 1 => 3900 mL

hope this helps!

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3 years ago

The roots of plants are important to photosynthesis because they...

lina2011 [118]

Answer:

$\boxed {\boxed {\sf C. \ Provide \ the \ water \ needed}}$

Explanation:

Photosynthesis is an extremely important process for plants, algae, and some bacteria. It helps create their "food", which is glucose. It is turned into energy so the organism can grow, repair damages, and carry out other processes.

The equation for photosynthesis is as follows:

$H_2O+CO_2+energy \rightarrow C_6H_{12}O_6 + O_2$

Water, carbon dioxide, and light energy from the sun are converted to glucose and oxygen.

Roots are important for obtaining <u>water</u>. Since they reach into the soil, they can absorb the water. Then, capillary action draws the water up the stem into the xylem and then into the leaves, where photosynthesis occurs.

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3 years ago

The main two characteristics that describe any igneous rock are

amm1812

All igneous rocks are defined by texture and gas content. Hope this helped, my man.

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3 years ago