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SC
1
5 tháng 8 2016
ta có công thức R2H6
PTK=NO=14+16=30
=> phân tử khối R =\(\frac{30-6}{2}\)=12
=> R là Cacbon ( C)
tên gọi là etan
%R trong hợp chất : \(\frac{12.2}{30}.100=80\%\)
VK
4 tháng 10 2019
15 câu hỏi liên quan đến sức khỏe bằng tiếng anh trả lời bằng tiếng anh
1. How are you? Very well, thank you. And you?
2. How are you today? Very well, thank you. And you?
3. How do you do? I’m fine, thanks. How are you?
4. How do you doing? Fine. Thank you
5. How have you been doing? I’m good, thanks. How about you?
6.How have you been? I’m good, thanks. How about you?
7. Everything OK? You look so tired ? Not too bad
8.. How are things? I’m doing great, thank you
9.How’s things? I’m doing great, thank you
10. How’s it going? Okay
11. How are you getting on? I’m feeling good now. Thanks for asking
12. What have you been up to? I'm still very strong
13. I hope everthing’s okay? I'm okay
14. Are you not feeling well? I'm ok
15. What’s wrong with you? Nothing happened to me
nhũng điều cần thiết cho sức khỏe bằng tiếng anh
1. Health is not only about physical matters, physical status but pure biological meaning, including mental health, life skills to adapt to social community and nature.
2. Take care of your health right from the womb to the age of birth, your child, prepare for the leap from adolescence to adolescence, through middle-aged work most effectively to the age of tri destiny to have a happy and healthy elderly life. Each of these stages has its own biological characteriss that need to be kept in full care, absolutely not underestimated at any age.
3. Conscious self-training to create a basic health foundation, a stable and dynamic mental state, suitable for age and nature, without relying on physical comfort and conditions. activities, nutrition, use of functional foods medicine.
4. Prevention is better than cure. When you are healthy, you must anipate and prevent the risk of proactive disease avoidance is the most effective economic problem.
5. Everyone must have health insurance, in addition to the subjects under the policy, need to buy voluntary insurance to be assured when paying hospital fees. People with middle income and above should consider buying additional life insurance.
6. Take advantage of online information and advice to have a basic understanding, consider appropriate options for illness and other conditions, avoid overcrowding at central level hospitals, bring about hospitalization conditions Best for sick and close relatives to take care of.
7. Irrespective of medical examination and treatment establishments and administrative services according to the classification of administrative properties, only according to the sole criterion is where the best quality of medical examination and treatment and support services come.
8. Respect every physician regardless of specialty, function of each stage of medical examination and treatment. The old mistake is to only value dissectors, while anesthetists, resuscitators, post-operative care watchers, or physicians who only provide counseling and sanitation for epidemic prevention are often overlooked. This is a disadvantage for patients because a right advice to avoid unnecessary surgery will benefit many patients and their relatives.
9. Appreciate and spend appropriately on family meals. Eating at a restaurant or bar is just a means of communication or a context of time conditions, especially in the difficult time on food hygiene and safety.
10. When sick, accident is the time to be alert to clear all the problems in the story of work money ... to regain peace, love to help each other overcome the tribulation.
mình nha mình mãi mới trả lời xong đó ≥^.^≤
5 tháng 8 2016
gọi công thức : R2O3
ta có PTK=PTK của 5S=5.32=160
=> 2R+O.3=160
=>2.R=160-3.16=112
=> R=56
=> R là Fe
là một loại liên kết hóa học bao gồm lực hút tĩnh điện giữa các ion tích điện trái dấu hoặc giữa hai nguyên tử có độ âm điện khác nhau rõ rệt.