CHEMISTRY HIGH SCHOOL

What is one difference between a galvanometer and an electric motor?

Answers

Answer 1
Answer:

An electric motor is a machine that is responsible for conversion of electricalenergy to mechanical energy. On the other hand a galvanometer is an electrical tool that is used to measures small values of current.

What is a galvanometer?

A galvanometer actually works by deflecting a pointer in an electric current response which is flowing through a coil under a constant magnetic field.

While an electric motor  performs its operation through the interaction between the magneticfield of motor and electriccurrent in a wire winding which generate a force in the form of torque.

Thus, this was the difference between a galvanometer and an electricmotor.

For more details regarding galvanometer, visit:

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Answer 2
Answer: Electric motor is a machine that converts electrical energy to mechanical energy while a Galvanometer is an electrical instrument that measures small values of current.

hope it helps :)

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2. When lithium reacts with bromine to form the compound LiBr,each lithium atom1) gains one electron and becomes a negatively charged ion2) gains three electrons and becomes a negatively charged ion3) loses one electron and becomes a positively charged ion4) loses three electrons and becomes a positively charged ion

Answers

3) Each lithium atom will lose one electron and become positively charged.

This is an example of ionic bonding wherein an electron is transferred from one atom to another. As each atom wants to have complete outer shells (with lithium's having one electron and bromine's having seven) the electron will move from the Lithium to the Bromine. Lithium will become positive as electrons are negatively charged and it has one less electron than it originally had. 

Calculate the atmospheric pressure if the boiling point of water is 81 degrees Celsius.

Answers

Answer : The atmospheric pressure of water if boiling at 81 °C will be 369 mmHg.


Explanation : The vapor pressure of boiling water can be calculated using the Antoine Equation:


log P = A - [(B)/( C + T) ],


where P is the pressure in mmHg,

A = 8.07131,

B = 1730.63

C = 233.426

and T = temperature in °C (81°C)


Substituting the given values, we get,

Log P = 8.07131− [(1730.63)/(233.426 + 81)]

Therefore, Log P =8.07131 − 5.5041 = 2.567.


Now, P = (10^(2.567) ) =369 mmHg.


Hence, the atmospheric pressure will be 369 mmHg.
To calculate the atmospheric pressure at a specific boiling point of water, we use the steam table or the Antoine equation. From steam table via interpolation, at 81 C, the pressure where saturation occurs is the atmospheric pressure. The atmospheric pressure is 369.7 mm Hg or 0.4864 atm.

The temperature of a sample of water changes from 10°C to 20°C when the water absorbs 100 calories of heat. What is the mass of the sample?

Answers

Answer:

10 g

Explanation:

Right from the start, just by inspecting the values given, you can say that the answer will be  

10 g

.

Now, here's what that is the case.

As you know, a substance's specific heat tells you how much heat is needed to increase the temperature of  

1 g

of that substance by  

1

∘

C

.

Water has a specific heat of approximately  

4.18

J

g

∘

C

. This tells you that in order to increase the temperature of  

1 g

of water by  

1

∘

C

, you need to provide  

4.18 J

of heat.

Now, how much heat would be required to increase the temperature of  

1 g

of water by  

10

∘

C

?

Well, you'd need  

4.18 J

to increase it by  

1

∘

C

, another  

4.18 J

to increase it by another  

1

∘

C

, and so on. This means that you'd need

4.18 J

×

10

=

41.8 J

to increase the temperature of  

1 g

of water by  

10

∘

C

.

Now look at the value given to you. If you need  

41.8 J

to increase the temperature of  

1 g

of water by  

10

∘

C

, what mass of water would require  

10

times as much heat to increase its temperature by  

10

∘

C

?

1 g

×

10

=

10 g

And that's your answer.

Mathematically, you can calculate this by using the equation

q

=

m

⋅

c

⋅

Δ

T

 

, where

q

- heat absorbed/lost

m

- the mass of the sample

c

- the specific heat of the substance

Δ

T

- the change in temperature, defined as final temperature minus initial temperature

Plug in your values to get

418

J

=

m

⋅

4.18

J

g

∘

C

⋅

(

20

−

10

)

∘

C

m

=

418

4.18

⋅

10

=

10 g

Within a particular compound, an atom gives up two electrons. This atom is A. part of a covalent compound.
B. positively charged.
C. negatively charged.
D. not part of an electrolyte.

Answers

Answer:

The correct answer is option B. positively charged.

Explanation:

A positively charged ion is an atom that readily loses its one or more electrons in a compound. Positively charged ion generally has same number of electrons and protons which means they are neutral charge atom. These atoms are generally attracted to negatively charged ion that lack electron in outer shell.

Thus, the correct answer is option. B. positively charged.
It is a positively charges because when an atom gives up electrons it becomes positively charges. Think of it like this.....its being generous so it deserves to be a positive person. ;D. 
It cant be A. because a covalent bond only shares and doesn't give up electrons. Our answer must be an ion.
Its not negatively charged because it didn't gain any.

So our answer is B. positively charged

When boiling water begins to turn to steam, which of the following remains the same in both the liquid and the vapor?A. phase
B. density
C. volume
D. temperature

Answers

Temperature remains the same.

Which statement describes how the bond between two oxygen atoms is formed?

Answers

The bond that exist between two oxygen atoms is called a double covalent bond. This bond involves the sharing of four electrons to obtain a more stable structure. This type of bond is much stronger than the single covalent bond.

Atoms bond by sharing valence electrons.
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