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BlackZzzverrR [31]
2 years ago
5

What elements did the first periodic table stop on?

Chemistry
1 answer:
gtnhenbr [62]2 years ago
5 0

Answer:

Bismuth

Explanation:

In 1869 Mendeleev published his first Periodic System ending with Bismuth.

In 1871 he updated his system to end with Uranium.

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At which point does a planet move most slowly in its orbit , at aphelion or perihelion
SVEN [57.7K]

Answer:

aphelion

Explanation:

A planet moves with constantly changing speed as it moves about its orbit. The fastest a planet moves is at perihelion (closest) and the slowest is at aphelion (farthest).

7 0
2 years ago
1.What is the specific heat capacity of granite when 20 kg absorbs 237 000 J of heat energy, causing its temperature to increase
Natalka [10]

<u>Given</u> :

  • Amount = 20 kg
  • Heat energy absorbed = 237,000 J
  • Temperature change = 15 °C

<u>Formula applied</u> :

\boxed {Q = mc \triangle T}

  • Q = absorbed heat
  • m = mass
  • c = specific heat capacity
  • ΔT = temperature change

Let's solve for c !

⇒ 237,000 = 20 × c × 15

⇒ c = 237,000 ÷ 300

⇒ \boxed {c = 790 J kg^{-1} K^{-1}}

∴ The specific heat capacity of granite is <u>790 J kg⁻¹ K⁻¹</u>.

5 0
1 year ago
Calculate the vapor pressure at 25 ?c of hexane above the solution. the vapor pressure of pure hexane at 25 ?c is 151 torr.
Studentka2010 [4]
One of the many ways in order to solve for the vapor pressure of pure components at a given temperature is through the Antoine's equation which is written below,
                                    P = 10^(A - B/C+T)
where A, B, and C are constants and T is the temperature in °C and P is the vapor pressure in mm Hg. 
For hexane,
                             A = 7.01
                             B = 1246.33
                             C = 232.988

Substituting the known values,
                            P = 10^(7.01 - 1246.33/232.988+25)
                             <em> P = 151.199 mm Hg</em>
8 0
3 years ago
it was observed that the atoms of a substance were arranged in a closely packed structure. What is most likely the state of matt
Kryger [21]

Answer:

Solid

Explanation:

Atoms are closely packed in a "<em>Solid</em>" substance, So, the substance is  a solid.

5 0
3 years ago
Please help (i know this is a lot but it makes no sense!!!!)
stealth61 [152]
Is this math or chemistry....:
6 0
3 years ago
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