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2 years ago

Which statement most completely defines a wave? *

Chemistry

1 answer:

Svetllana [295]2 years ago

4 0

Answer:

A wave transfers energy through a medium or empty space without transporting matter.

Explanation:

A wave is a transmission of a disturbance from one point known as the source to another.
Waves may transfer energy through a material medium or a vacuum without transporting matter.
Waves that transfer energy from one point to another through a material medium are known as mechanical waves.
Electromagnetic waves, on the other hand, are those that do not require a material medium for transmission, the transfer of energy is through a vacuum.
Waves can also be either transverse or longitudinal waves based on the vibration of particles relative to the direction of wave motion.

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A 360. g iron rod is placed into 750.0 g of water at 22.5°C. The water temperature rises to 46.7°C. What was the initial tempera

Grace [21]

Answer: The initial temperature of the iron was $515^0C$

Explanation:

$heat_{absorbed}=heat_{released}$

As we know that,

$Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})$

$m_1\times c_1\times (T_{final}-T_1)=-[m_2\times c_2\times (T_{final}-T_2)]$ .................(1)

where,

q = heat absorbed or released

$m_1$ = mass of iron = 360 g

$m_2$ = mass of water = 750 g

$T_{final}$ = final temperature = $46.7^0C$

$T_1$ = temperature of iron = ?

$T_2$ = temperature of water = $22.5^oC$

$c_1$ = specific heat of iron = $0.450J/g^0C$

$c_2$ = specific heat of water= $4.184J/g^0C$

Now put all the given values in equation (1), we get

$-360\times 0.450\times (46.7-x)=[750\times 4.184\times (46.7-22.5)]$

$T_i=515^0C$

Therefore, the initial temperature of the iron was $515^0C$

4 0

3 years ago

What is Wesley Harris, the writer of this account, trying to escape

4vir4ik [10]

Answer:

Slavery.

Explanation:

6 0

3 years ago

Read 2 more answers

What is the periodic trend for atomic size from top and bottom in a group? From left to right in a period ?

BigorU [14]

Answer:

Explanation: Electron affinity generally increases from left to right and from bottom to top. Explanation: Periodic trends indicate that atomic radius increases up a group and from left to right across a period. Therefore, oxygen has a smaller atomic radius sulfur.

7 0

3 years ago

Read 2 more answers

Delta S will be positive for the reaction ________. a. 2Hg (l) + O2(g) ----------> 2HgO (s) b. 2NO2 (g) -------> N2O4(g) c

nordsb [41]

Answer:

BaF2(s) ------> Ba2 (aq) + 2F- (aq)

Explanation:

Entropy refers to the degree of disorderliness in a system. Processes that lead to greater disorderliness in a system are said to increase the entropy of the system or lead to a positive value of ΔS.

If we consider the process, BaF2(s) ------> Ba2 (aq) + 2F- (aq), we will notice that ions were produced in solution thereby increasing the disorderliness of the system.

8 0

2 years ago

There are 4 molecules racing to get across a typical cell membrane. Contestants: a.C6H12O6, b.CO2, c.Cl- and d.CH3CH2CH2COOH (a

dmitriy555 [2]

Answer:

b.CO2

d.CH3CH2CH2COOH (a fatty acid)

c.Cl-

a.C6H12O6

Explanation:

The cell membrane is permeable to gases and fatty acids, as they are non polar and small molecules. Those goes throught the cell membrane with no need of a canal or carrier.

The polar and big molecules needs a canal (as Cl-) or carrier (as C6H12O6) to get the cytoplasma.

3 0

3 years ago