Explain the alignment of Earth, Sun and Moon during a lunar and solar eclipse.

Which atom can bond with each other to form chains, rings or networks? (1) carbon atoms (2) hydrogen atoms (3) oxygen atoms (4) nitrogen atoms

Which of the following would float in water at 25 ºC? a. None of the other answers are applicable. b. A substance with a density of greater than 1.00 g/mL. c. A substance with a density of just greater than 1.00 g/mL. d.

A carbon dioxide fire extinguisher is the best choice if an electric clothes dryer is on fire. Why would a water extinguisher not be stable for the clothes dryer fire?

The ___ number is a postive or negative number assigned to an atom according to a set of abituary rules

A compound is analyzed and found to contain 22.10%Al, 25.40%P, and 52.50%O. What is the empirical formula of the compound?

Which terms are used to identify pure substances? (1) an element and a mixture (2) an element and a compound (3) a solution and a mixture (4) a solution and a compound

Which of the following polyatomic ions will form an ionic compound with two sodium ions? CO32- HCO31- NO21- NO31-

What is hybridisation

2. Seorang ibu perlu menyediakan satu hidangan kari daging dengan cepat untuk anaknya yang lapar. Langkah manakah yang berikut dapat membantu dia mencapai tujuan ini? (CL01, C2) A. Menggunakan periuk yang lebih besar B. Menambah banyak serbuk kari C.

Which of the following statements is not true? Question 4 options: When atoms have similar electronegativities, electrons are shared equally When electrons are shared equally, the molecule is called a nonpolar molecule.