Answer:
D 4,3,2
Explanation:
4 Co + 3 O2 ----> 2 Co2O3
Answer:
Explanation:
solid would be a wall e.g
liquid would be water e.g
gas would be oxygen e.g
Answer:
boron
Explanation:
boron has 5 protons and carbon has 6, so if carbon lost a proton, it would become boron since each element has a unique number of protons.
Answer:
2.640
Explanation:
Rounding to the nearest whole number would be 3 if that is needed.
Yasir wanted to study the relationship between sleep and room color. So he has done all the background study required on the topic and arrived at a hypothesis that people fall asleep more rapidly in a room painted in blue color than in a room painted yellow. Yasir inquired several people which color they like better -yellow or blue- and used their feedback to decide whether his hypothesis was correct. There was no experiment conducted to observe the effect of a room color on sleep and the variables to be tested in the experiment were not properly identified.
Therefore, the correct answer would be,
An experiment that directly tests the hypothesis
Variables to be tested by an experiment
