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iragen [17]
2 years ago
5

PLEASE HELP ASAP!!! I REALLY NEED HELP ON THIS TEST!!!

Chemistry
1 answer:
Oksana_A [137]2 years ago
5 0

Answer:

1. Hyphothesis 2.Theory 3. law

Explanation:

not sure, but law is observation, theory is based on knowledge things before.

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A 17.98-g piece of iron absorbs 2056.5 joules of heat energy, and its temperature changes from 25°C to 200°C. Calculate the spec
V125BC [204]

Answer: 0.65\ J/g.^{\circ}C

Explanation:

Given

Mass of iron piece is m=17.98\ g

Heat absorbed Q=2056.5\ J

Temperature changes from 25^{\circ}C\ to\ 200^{\circ}C i.e.

\Delta T=200-25=175^{\circ}C

Heat absorbed is given by Q=mc\Delta T\quad [c=\text{specific heat of material}]

Insert the values

\Rightarrow 2056.5=17.98\times c\times 175\\\\\Rightarrow c=\dfrac{2056.5}{3146.5}\\\\\Rightarrow c=0.65\ J/g.^{\circ}C

Thus, the specific heat of iron is 0.65\ J/g.^{\circ}C

7 0
3 years ago
Match each of the following descriptions to thecorrect element listed
Slav-nsk [51]

Answer: Please see explanation for answer

Explanation:Matching the  descriptions to the correct element listed gives

Element Group Name Group No Metal/ Nonmetal/ Metalloid Description

Neon    Noble gases       18           Non metal Colorless, tasteless, and        odorless gas, unreactive, nonconductive.

Bromine      Halogens   17          Non metal Not found as a free element (uncombined) in nature, reddish-brown liquid that vaporizes readily at room temperature to a red gas with a strong disagreeable odor.

Beryllium       Alklaline earth metal  2    Metal  Silvery-white, ductile, malleable, conductive solid with a high melting point for this type of element

Platinum     Platimum group metals  10   Metal      Silvery white, relatively soft, low density, conductive solid that is not found as a free element in nature but commonly found combined in alloys with copper or nickel

Potassium   Alkali Metals   1   Metal  Soft, easily cut with a knife to expose a silvery surface that rapidly oxidizes in air; never found uncombined in nature

Silicon    Carbon family     1`4  Metalloid   Metallic luster and grayish solid, very common in rocks and gemstones such as amethyst and opal, semiconductor

Sulfur   Calcogens      16  Non metal  Pale yellow, odorless, brittle solid at room temperature, nonconductor

4 0
2 years ago
What is the main difference between active transport and passive transport? *
svp [43]

Answer:

There are two major ways that molecules can be moved across a membrane, and the distinction has to do with whether or not cell energy is used. Passive mechanisms like diffusion use no energy, while active transport requires energy to get done.

Explanation:

4 0
2 years ago
Which accurately completes the statement? Conduction involves the transfer of ___________ due to the movement of particles. Grou
Jlenok [28]

Explanation:

conduction involves the transfer of molecules due to the movement of particles

5 0
3 years ago
exactly 1mol of n2o4 is placed in an empty 1 l container. if at equilibrium n2o4 is dissociated 20%, what is the value of equili
egoroff_w [7]

Answer:

K = 0.2

Explanation:

Based on the chemical dissociation of N₂O₄:

N₂O₄ ⇄ 2NO₂

The equilibrium constant, K, of the reaction is:

K = [NO₂]² / [N₂O₄]

Now, if 20% of N₂O₄ is dissociated, 80% remains as N₂O₄ = 0.8mol/L = 0.8M

as 20% is dissociated, 0.2moles of N₂O₄ were dissociated and 0.2*2 = 0.4mol/L of NO₂ are produced.

Replacing in K:

K = [0.4M]² / [0.8M]

<h3>K = 0.2</h3>
5 0
3 years ago
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