200ml dd HCL có nồng độ 3,5M hòa tan vừa hết 20g hỗn hợp hai oxit cho và Fe2O3. a) Viết phương trình

b) Tính khối lượng của mỗi oxit có trong hỗn hợp ban đầu.

Two atoms interact with each other as shown by the equation. complete the equation by filling in the missing parts. 1 2 3 4 5 h he li

Which statement correctly identifies the scientific question and describes why the question is scientific? question 1 refers to the supernatural.question 2 reflects a moral or social value.question 3 refers to something that can be measured.question 4 reflects a question that can’t be observed.

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.