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TOP 10 mẫu Tóm tắt Tự học – một thú vui bổ ích 2023 hay, ngắn gọn
Tháng Chín 24, 2023
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30 câu Trắc nghiệm Amino axit có đáp án 2023 – Hóa học lớp 12
Tháng Mười 7, 2023
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The more time you spend on social media,________ you feel.
Tháng Chín 20, 2023
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Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.A large number of inventions require years of arduous research and development before they are perfected. For instance, Thomas Edison had to make more than 1,000 attempts to invent the incandescent light bulb before he finally succeeded. History is replete with numerous other examples of people trying, yet failing to make inventions before they eventually succeeded. Yet some inventions have come about not through hard work but simply by accident.In most cases, when someone unintentionally invented something, the inventor was attempting to create something else. For example, in the 1930s, chemist Roy Plunkett was attempting to make a new substance that could be used to refract items. He mixed some chemicals together. Then, he put them into a pressurized container and cooled the mixture. By the time his experiment was complete, he had a new invention. It was not a new substance that could be used for refrigeration though. Instead, he had invented Teflon, which is today most commonly used to make nonstick pots and pans. similar, decades earlier, John Pemberton was a pharmacist in Atlanta, Georgia. He was attempting to create a tonic that people could use whenever they had headaches. While he was not successful in that endeavor, he managed to invent Coca-Cola, the world – famous carbonated soft drink. Scientists have also made crucial discoveries by accident when they were conducting experiments. In 1928, Alexander Fleming discovered penicillin, an antibiotic, in this manner. He discovered some mold growing in a dish with some bacteria. He noticed that the bacteria seemed to be avoiding the mold. When he evaluated further, he determined some of the many useful properties of penicillin, which has saved millions of lives over the past few decades. Likewise, in 1946, scientist Percy Spencer was conducting an experiment with microwaves. He had a candy bar in his pocket, and he noticed that it suddenly melted. He evaluated and learned the reason why that had happened. Soon, he built a device that could utilize microwaves to heat food. the microwave oven.What does the author imply about penicillin?
Tháng Bảy 22, 2023
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400 câu Trắc nghiệm Tổng hợp Hóa học lớp 10 cực hay
Tháng Mười 4, 2023
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[Năm 2022] Bộ 12 Đề thi Giữa kì 1 Tiếng Anh lớp 4 có đáp án
Tháng Mười Một 4, 2023
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