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3 years ago

Which scientist invented the first simple Microscope ?

Chemistry

1 answer:

Vinvika [58]3 years ago

6 0

Answer:

D. Leeuwenhoek

Explanation:

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The first black man to be elected to the united state senate

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Hiram Revels was the first black man to be elected to the US senate

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3 years ago

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3 years ago

15. Within a voltaic cell,___

kobusy [5.1K]

Answer:

B. oxidation; reduction

Explanation:

A voltaic cell is electro-chemical cell in which chemical energy is converted into electrical energy.

1. This cell utilizes chemical reaction to generate electric.\

2. there two electrode anode and cathode

3. At Anode oxidation occurs

4. At cathode reduction occurs

5. chemical is present in the cell which is electrolyte which completes the circuit of the voltaic cell.

oxidation is the process in which there is loss of electrons
Reduction is the process in which there is gain of electrons

___________________________________________________

Based on above discussion

At anode oxidation takes place

At cathode reduction takes place.

Hence, correct option is B. oxidation; reduction

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3 years ago

if the Gulf Stream is warm and the air in Europe is cold, what kind of energy transfer will happen between the water and the air

Kryger [21]

Answer:

If it weren't for the warm water of the Gulf Stream, England would have a much colder climate

Explanation:

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3 years ago

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A silver block, initially at 59.4 °C, is submerged into 100.0 g of water at 24.8 °C, in an insulated container. The final temper

Tatiana [17]

Answer:

The mass of silver block = 73.95 g

Explanation:

Given,

For water:

Mass = 100.0 g

Initial temperature = 24.8 °C

Final temperature = 26.2 °C

Specific heat of water = 4.184 J/g°C

For silver:

Mass = x g

Initial temperature = 59.4 °C

Final temperature = 26.2 °C

Specific heat of water = 0.2386 J/g°C

Heat gain by water = Heat lost by silver

Thus,

$m_{water}\times C_{water}\times (T_f-T_i)=-m_{silver}\times C_{silver}\times (T_f-T_i)$

Where, negative sign signifies heat loss

Or,

$m_{water}\times C_{water}\times (T_f-T_i)=m_{silver}\times C_{silver}\times (T_i-T_f)$

So, $100.0\times 4.184\times (26.2-24.8)=x\times 0.2386\times (59.4-26.2)$

$x\times \:0.2386\left(59.4-26.2\right)=100\times \:4.184\left(26.2-24.8\right)$

$x\times \:0.2386\left(59.4-26.2\right)=585.76$

$x=\frac{585.76}{7.92152}$

$x=73.95$

Hence, the mass of silver block = 73.95 g

4 0

4 years ago