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2 years ago

Answer all of them free brainlest

Chemistry

2 answers:

Pavel [41]2 years ago

7 0

No ablo English sorry Mija/o

sergiy2304 [10]2 years ago

3 0

Answer:

Explanation:

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If irons temperature goes from 50c to 75c in a 20g sample, how many joules of heat were used?

Marina CMI [18]

Answer:

Option D. 230 J

Explanation:

We'll begin by calculating the temperature change of the iron. This can be obtained as follow:

Initial temperature (T₁) = 50 °C

Final temperature (T₂) = 75 °C

Change in temperature (ΔT) =?

ΔT = T₂ – T₁

ΔT = 75 – 50

ΔT = 25 °C

Thus, the temperature change of the iron is 25 °C.

Finally, we shall determine the amount of heat energy used. This can be obtained as follow:

Mass (M) = 20 g

Change in temperature (ΔT) = 25 °C

Specific heat capacity (C) = 0.46 J/gºC

Heat (Q) =?

Q = MCΔT

Q = 20 × 0.46 × 25

Q = 230 J

Thus, the amount of heat used was 230 J

3 0

3 years ago

PLEASE HELP!!! 10 POINTS

k0ka [10]

i think the answer is C

3 0

3 years ago

What is the volume of 120 mg of water? A. 1.2 dL B. 120 mL C. 120 L D. 1.2 L

mojhsa [17]

I would say B but I am not sure so sorry if it is wrong!!

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3 years ago

The radius of a vanadium atom is 130 pm. How many vanadium atoms would have to be laid side by side to span a distance of 1.30 m

monitta

Answer:

5 000 000 (5 million atoms)

Explanation:

Let us assume that a vanadium atom has a spherical shape.

diameter of a sphere = 2 x radius of the sphere

Thus,

Radius of a vanadium atom = 130 pm

= 130 x $10^{-12}$ m

The diameter of a vanadium atom = 2 x radius

= 2 x 130 x $10^{-12}$

= 260 x $10^{-12}$ m

Given a distance of 1.30 mm = 1.30 x $10^{-3}$ m,

The number of vanadium atoms required to span the distance = $\frac{1.3*10^{-3} }{260*10^{-12} }$

= 5000000

Therefore, the number of vanadium atom that would span a distance of 1.30 mm is 5 million.

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3 years ago

In the modern periodic table, elements are arranged according to increasing ____. (1 point). . a. atomic number. b. atomic mass.

ki77a [65]

I think the correct answer from the choices listed above is option A. In the modern periodic table, elements are arranged according to increasing atomic number. The atomic number represents the number of protons present for a specific atom.

5 0

3 years ago