Ionic bonds is formed between metal and nonmetal with opposite charges. Metal have (+) charge and nonmetals often have (-) charge.
Choice (a) is wrong because both charges are the same.
Choice (c) is wrong b/c same changes.
Si and O do not have charges for now. (d) is wrong.
Choice (b) is correct. Opposite charges and the ionic compound is BaCl2
Answer:
Motile bacteria have flagella, while nonmotile bacteria do not.
Explanation:
Question 1 is false, new substances are formed when a chemical change takes place. The other two you've answered are true to my knowledge. Question 5 and 7 are also true I think.
Question 2 should be a physical change and flammability is a chemical property (question 4); I can't really read the other questions too well.
Glass is not a living organism, so it is <u>abiotic</u>.
