The substance hydrogen has the following properties: normal melting point: 14.0 k normal boiling point: 20.3 k triple point: 7.1×10-2 atm, 13.9 k critical point: 12.8 atm, 33.2 k at temperatures above 33.2 k and pressures above 12.8 atm, h2 is a . h2 does not exist as a liquid at pressures below atm. h2 is a at 4.84 atm and -0.2 k. h2 is a at 1.00 atm and 15.6 k. h2 is a at 7.10×10-2 atm and 34.4 k. which of the following are true?

choose all that apply

the final state of the substance is a gas.

the sample is initially a solid.

the gas initially present will solidify.

the final state of the substance is a solid.

no phase change will occur

supercritical fluid, 0.071, solid, liquid, gas.

The sample is initially a solid.

The final state of the substance is a solid.

No phase change will occur.

Explanation:

Let's refer to the attached phase diagram for H₂ (not to scale).

At temperatures above 33.2 K and pressures above 12.8 atm, H₂ is a supercritical fluid.

H₂ does not exist as a liquid at pressures below 0.071 atm.

H₂ is a solid at 4.84 atm and 0.2 K.

H₂ is a liquid at 1.00 atm and 15.6 K.

H₂ is a gas at 7.10×10-2 atm and 34.4 K.

I think the missing question is this:

A sample of hydrogen is initially at a pressure of 19.1 atm and a temperature of 0.6 K. The pressure on the sample is reduced to 7.10×10⁻² atm at a constant temperature of 0.6 K. Which of the following are true?

Choose all that apply

The final state of the substance is a gas.  NO. At 7.10×10⁻² atm and 0.6 K, hydrogen is a solid.

The sample is initially a solid. YES.

The gas initially present will solidify. NO. Initially, it is solid.

The final state of the substance is a solid.  YES.

No phase change will occur. YES.

answer: e.   sour taste

explanation: acids are those substances which dissociates in water to give ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. acids are sour in taste. example: hcl

bases are those substances which dissociates in water to give ions or accepts ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. bases are bitter in taste. bases are slippery in nature.