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    If you enjoy fall activities, the state of Virginia is the place to be. There are many festivals to choose from. Here are four I believe will be great fun.

Henry Street Heritage Festival

    It will last from Saturday September 21st 2014, 11:00a.m,until 10:00 p.m .The festival is held by the Harrison Museum of African American Culture. This public festival takes place in Elmwood Park in downtown Roanoke. It is a celebration of the culture, history, and arts of African Americans and there is always a lot of entertainment, which includes local and national talent.  Last year entrance was $10.00

    Mountain magic crafts festival

    This festival takes place on Saturday October 5th, 2014, at 19753 Main Street, in Buchanan, Va. The time is 10:00a.m. until 5:00p.m .This will be a celebration of the region's heritage(遗产), through history, crafts and music. There will be free, live music throughout the day, and plenty of arts and crafts plus delicious food.

    Massanutten fall festival

    The time and location is Saturday October 12th,2014, 11:00a.m. until 5:00 p.m. at the Massanutten Ski Area. This Fall Festival will feature more than 60 arts and crafts vendors(小贩), food vendors, live music, wine tasting, children's activities, and more. Tickets are $5 in advance, and $10 at gate. Children under age 8 are admitted free. Rides will run between the hours of 11:00am to 3:00 pm. Be in line with your ticket; no later than 2:30 pm.

    Children's Arboretum(植物园) Festival

    The fun takes place, on Saturday October 19th, 2014 from 1:00 pm until 5:00 pm at the Edith J. Carrier Arboretum. There will be musical instrument shows and performances, singers, crafts, dance exhibitions and lessons. There will also be seed collecting trail activities, trail tours, story time, and snacks. This fall festival is a free event

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工业上在合成塔中采用下列反应合成甲醇:CO(g)+2H2(g)⇌CH3OH(g)△H=QkJ/mol

(1)判断该可逆反应达到平衡状态的标志是(填字母序号)____ 

a、生成CH3OH的速率与消耗CO的速率相等

b、混合气体的密度不变

c、混合气体的平均相对分子质量不变

d、CH3OH、CO、H2的浓度都不再发生变化

(2)如表所列数据是该可逆反应在不同温度下的化学平衡常数(K)

温度

250℃

300℃

350℃

K

2.041

0.270

0.012

①由表中数据判断Q____ 0(填“>”、“<”或“=”)

②某温度下,将2mol CO和6mol H2充入2L的密闭容器中,充分反应后,达到平衡测得c(CO)=0.2mol•L﹣1,此时对应的温度为____ ;CO的转化率为____ 

(3)请在图中画出压强不同,平衡时甲醇的体积分数(φ)随温度(T)变化的两条曲线(在曲线上标出P1、P2、,且p1<P2____ 

(4)要提高CO的转化率,可以采取的措施是____ (填字母序号).

a、升温  b、加入催化剂  c、增加CO的浓度  d、通入H2加压账   e、通人惰性气体加压   f、电离出甲醇

(5)已知一定条件下,CO与H2在催化剂的作用下生成5mol CH3OH时,能量的变化为454kJ.在该条件下,向容积相同的3个密闭容器中,按照甲、乙、丙三种不同的投料方式加人反应物,测得反应达到平衡时的有关数据如下:

容器

反应物投入量

1molCO、2molH2

1mol CH3OH

2mol CH3OH

平衡时数据

CH3OH的浓度(mol•L﹣1

c1

C2

C3

反应吸收或放出的能量(KJ)

a

b

c

体系压强(Pa)

P1

P2

P3

反应物转化率

α1

α2

α3

下列说法正确的是____ (填字母序号).

A、2c1>c3    B、a+b<90.8     C、2P2<P3      D、α13<1.