🎓 Zapisz cząsteczkowo, jonowo i sposobem skróconym reakcje: a. zasada barowa + kwas azotowy(V) b. azotan(V) żelaza(III) + siarczek sodu c. chlorek cynku + zasada sodowa d. zasada wapniowa + kwas bromowodorowy - Odrabiamy.pl

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Zapisz cząsteczkowo, jonowo i sposobem skróconym reakcje:
a. zasada barowa + kwas azotowy(V)
b. azotan(V) żelaza(III) + siarczek sodu
c. chlorek


Polub to zadanie


a) zasada barowa + kwas azotowy(V)

Język angielski

Przeczytaj tekst, który został podzielony na trzy części (A–C), oraz pytania go dotyczące
(4.1.–4.4.). Do każdego pytania dopasuj właściwą część tekstu. Wpisz rozwiązania
do tabeli.
Uwaga: jedna część tekstu pasuje do dwóch pytań.

In which paragraph does the author mention 
4.1. the overall duration of the unusual phenomenon? 
4.2. risky behaviour motivated by curiosity? 
4.3. what caused the Niagara Falls to dry up? 
4.4. the negative impact of the small amount of water in the river? 


A. In 1848, the Niagara Falls were already a tourist attraction, and villages had grown up on
both the U.S. and Canadian sides of the river to accommodate the crowds of sightseers.
But on March 29th, shortly before midnight, a farmer who had gone out for a stroll noticed
that something was wrong. When he went to the edge of the Niagara River, he saw hardly
any water. At dawn on March 30th, people awoke to an unusual silence. The mighty Niagara
was just a trickle. Fish were dying. Turtles and other creatures living in the river were
clumsily working their way through the mud. People walked on the exposed river bed, eager
to discover what had been hidden below the water surface, ignoring the fact they might be
swept away if the water suddenly started flowing. They picked up old daggers and
tomahawks as souvenirs.

B. No one knew why the falls had stopped flowing. The telegraph was still a new invention.
Railroads already served towns on both sides of the river, but the tracks were unreliable,
and Buffalo, the nearest big city, was three hours away even when the trains ran on time.
Yet it was from Buffalo that the first news about the problem eventually arrived. It turned out
that strong southwest winds had pushed huge chunks of ice to the north-eastern tip of Lake
Erie which blocked the water flow and created an ice dam.

C. When water stopped flowing on March 29th, people started coming from nearby cities and
towns to see what had happened. No water flowed over the falls all day on March 30th and
throughout the daylight hours of March 31st. But that night, a distant low-pitched noise came
from upriver. It got nearer and louder. Suddenly, a wall of water came down the upper
Niagara River and over the falls with a giant thunder. The river was running again.
adapted from www.niagarafrontier.com

5 minut temu
Język angielski

Usłyszysz dwukrotnie wywiad z naukowcem. Z podanych odpowiedzi wybierz właściwą,
zgodną z treścią nagrania. Zakreśl jedną z liter: A, B, C albo D.

3.1. Why does Professor Cantrell teach his students to scuba dive?
A. to help them link his teaching to real life experience
B. to pursue his passion for exploring coral reefs
C. to prove that biology can be taught anywhere
D. to check their knowledge of marine life

3.2. Why did Professor Cantrell decide to carry out the project?
A. to motivate primary school children to get interested in science
B. to analyse students’ attitudes towards threats to the oceans
C. to encourage school trips to the Florida Undersea Lodge
D. to make young people interested in science again

3.3. While carrying out the project, Professor Cantrell
A. recorded classes to be shown later.
B. cooperated with other marine life specialists.
C. drew inspiration from similar underwater broadcasts.
D. allowed students to stay in the Florida Undersea Lodge overnight.

3.4. When asked about coral reefs, Professor Cantrell says that
A. diving and sailing interfere with their restoration.
B. the process of growing coral takes too much time.
C. excessive paperwork is delaying their restoration.
D. scientists are discouraged from growing coral for transplant.

3.5. When answering the last question, Professor Cantrell
A. points to an unexpected turn his career has taken following the project.
B. explains why underwater research projects are necessary.
C. discusses the potential for similar projects worldwide.
D. gives evidence for the success of the project.

30 minut temu
29 marca 2019

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około 2 godziny temu
27 marca 2019
29 marca 2019