Các hiệu ứng điện tử trong hóa hữu cơ sẽ làm ảnh hướng đến A. Tính chất hóa học B. Khả năng phản ứng, cơ chế, chiều hướng phản ứng C. Tất cả đều đúng D. Tính acid - base

Which statement describes evidence of a chemical reaction? a) ice melting eliminate b) water boiling c) lighting a match d) grape juice freezing

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? a. the balloons both rise. the cold balloon is larger than the warm balloon. b. the balloons rise at the same rate. both balloons are the same size. c. the warm balloon expands and rises. the cold balloon shrinks and sinks. d. the cold balloon expands and rises. the warm balloon shrinks and sinks.

In what environment would mineral formation caused by high pressures and high temperatures most likely occur?