本课程是MEL Chemistry VR的一部分。 Learn more →
atoms, mat-ter, state of mat-ter, gas,?tem-per-a-ture
- Gas-es are not mat-ter be-cause we can't see them or feel their?mass.
- Learn that atoms in gas-es are much fur-ther away from each oth-er than in?solids
- Find out that atoms in gas-es are fly-ing?freely
- See that when the tem-per-a-ture in-creas-es atoms in gas start to move faster and when the tem-per-a-ture de-creas-es they slow?down
- Be able to com-pare the den-si-ty of gaseous ob-jects to sol-id?ones
The goal is to demon-strate how much denser liq-uid and sol-id ob-jects are com-pared to gas-es. Ask stu-dents to de-ter-mine (make mea-sure-ments with a set of weights and then count) how many he-li-um bal-loons a stu-dent needs to lift him/her up in the?air.
Equip-ment: bal-loons filled with he-li-um, set of?weights.
The goal is to show stu-dents how pow-er-ful gas par-ti-cle mo-tion is. Ask stu-dents to pull out a sy-ringe plunger and keep it in place with their fin-gers. Let them see how easy they can do it. Then ask them to close the hole with their fin-ger and pull out the plunger again. Let them feel that it be-comes much hard-er to hold the plunger so that they can see how rig-or-ous-ly gas par-ti-cles move and hit ev-ery-thing?around.
His-to-ry and sources of?knowl-edge
- The an-cient Greek the-o-ry that air was one of the ba-sic?el-e-ments.
- Dis-cov-ery of dif-fer-ent gas-es in the?air.
- Our knowl-edge about air as a mix-ture of?gas-es.
- Par-ti-cle mo-tion in gas-es: un-der a mi-cro-scope, we can see the Brown-ian mo-tion of tiny smoke par-ti-cles in the air. It proves that air con-sists of tiny par-ti-cles mov-ing?chaot-i-cal-ly.
- How do we know that there are gas par-ti-cles around us if we can't see?them?
- The speed of gas?par-ti-cles.
- How much denser are solids than?gas-es?
- Bil-lions of gas par-ti-cles are hit-ting us, why don't we feel?it?
- If you stretch out the palm of your hand, you ac-tu-al-ly hold about 100 kg of?air.
- The heav-i-est gas is sul-phur hex-aflu-o-ride. If you pour this gas in the tank 锡纸船将漂浮在其顶部.
- Air is rough-ly 1,000 times less dense than wa-ter. 1 cu-bic me-ter of wa-ter weighs 1 ton or 1,000 kg, while 1 cu-bic me-ter of air weighs ap-prox-i-mate-ly 1.3?kg.
- Why can gas-es change their shape and solids?can't?
- Why can gas-es change their vol-ume and solids?can't?
- What is denser gas or sol-id and?why?
In Chi-na, one of the world’s fastest trains can reach a speed of 430 km/h (ap-prox-i-mate-ly 0.2 km/s). In the air, oxy-gen par-ti-cles trav-el at around 500 m/s. Which is faster oxy-gen par-ti-cles or the?train?