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Sergio039 [100]
3 years ago
7

Using Hooke's law, F s p r i n g = k Δ x , find the distance a spring with an elastic constant of 4 N/cm will stretch if a 2 new

ton force is applied to it.
1/2cm


2 cm


4 cm


8 cm
Chemistry
2 answers:
irakobra [83]3 years ago
6 0

1/2cm

just took the test and this is the right answer

ki77a [65]3 years ago
3 0
I think it is the first option 1/2 cm.
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Given the equation for a system at equilibrium:
zlopas [31]

Answer: 1. NH_3 increases.

Explanation:

Any change in the equilibrium is studied on the basis of Le-Chatelier's principle.This principle states that if there is any change in the variables of the reaction, the equilibrium will shift in the direction to minimize the effect.

For the given equation:

N_2(g)+3H_2(g)\rightleftharpoons 2NH_3(g)+energy

If the concentration of N_2 is increased , according to the Le-Chatlier's principle, the reaction has to shift to right or forward direction. In order to do that  the concentration of products has to increase.

Thus the concentration of NH_3 increases.

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N which block of the periodic table is uranium (U) found?
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Found in the D block
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3 years ago
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The ionic compounds NaClNaCl and MgSMgS are represented by the diagrams above. Which statement correctly identifies diagram 1 an
Oksana_A [137]

Answer:check explanation

Explanation:

No diagram is given above but to determine the value of melting point we need to understand the fact that NaCl has a lower melting point than MgS.

Reasons are; (1) sodium ion (+1) in the first group of the periodic table is characterized by its softness and low melting point and, (2). Is that it has a lower melting point than MgS because the COULUMBIC ATTRACTIONS between its singly charged sodium ions(+1) and the chlorine ions(-1) are weaker than those between the ions in MgS.

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3 years ago
Calculate the hydrogen ion concentration in a 3.4 x 10-3 M<br> solution of KOH.
notsponge [240]

Explanation:

KOH→K {}^{ + }  + OH {}^{ - }  \\ [OH {}^{ - } ] = 3.4 \times  {10}^{ - 3}  \\ k _{w} = [OH {}^{ - } ] [H {}^{  + } ]  \\ 1 \times  {10}^{ - 14}  = 3.4 \times  {10}^{ - 3}  \times [H {}^{  +  } ]  \\ [H {}^{  +  } ]  = 2.94 \times  {10}^{ - 12}  \: M

7 0
2 years ago
Some major contributions to the development of atomic theory are listed. Identify the scientist associated with each contributio
gogolik [260]

Answer:

He discovered the electron - J.J Thompson

He discovered periodic changes in properties of elements when they are listed in order of their atomic weights - Dimitri Mendeleev

He experimented with the deflection of cathode rays by a magnetic field - J.J Thompson

He carried out experiments that measured the scattering of alpha particles by heavy atoms - Ernest Rutherford

His model of the hydrogen atom led to an accurate calculation of the wavelengths of light emitted by an excited hydrogen atom - Neil Bohr

He proposed the planetary model of the atom with most of the mass of the atom concentrated in a very small nucleus -  Ernest Rutherford

He modified the planetary model of the atom by suggesting electrons could travel about the nucleus in only a few discrete stable orbits - Neil Bohr

Explanation:

J.J Thompson discovered the electrons. He initially called them cathode rays and he also studied how they are deflected in magnetic fields and by so doing established that they are negatively charged particles.

Ernest Rutherford is renowned for his experiment using the thin gold foil and alpha particles to determine that atoms have a positively charged massive core called the nucleus. This led to the proposition of the planetary model of the atom.

Dimitri Mendeleev discovered periodic changes in properties of elements when they are listed in order of their atomic weights. This led to the discovery of the Mendeleev  periodic table.

Neil Bohr model of the atom gave accurate explanation of the emission spectra of the hydrogen atom. His atomic model suggested that electrons could travel about the nucleus in only a few discrete stable orbits.

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3 years ago
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