20.10:2+5-7.3
Tik nhé , mk tíc lại
K
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TN
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DM
29 tháng 1 2019
20.10. Câu nào sau đây nói về sự nở vì nhiệt của các chất khí ô-xi, hi-đrô và cac-bo-nic là đúng khi làm thí nghiệm như mô tả ở bài 20.9 với các chất khí này?
A. Hi-đrô nở vì nhiệt nhiều nhất.
B. Cac-bo-nic nở vì nhiệt ít nhất,
C. Ô-xi nở vì nhiệt ít hơn hi-đrô nhưng nhiều hơn cac-bo-nic.
D. Cả ba chất đều nở vì nhiệt như nhau.
Chọn D. Từ thí nghiệm như mô tả ở bài 20.9 về sự nở vì nhiệt của các chất khí ô- xi, hi-đrô và các-bô-níc ta thấy cả ba chất đều nở vì nhiệt như nhau.
GR
5
1 tháng 11 2016
17 k nha
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\(20.10:2+5-7.3\)
\(=200:2+5-21\)
\(=100+5-21=105-21=84\)
\(=nhae\)
20.10:2+5-7.3
=200:2+5-7.3
=100+5-7.3
=105-7.3
=98.3
=294