1. One of the substances in a new alkaline battery is composed of 63.0% manganese and 37.0% oxygen by mass. Determine the empirical formula of the compound in the battery.

Which statement describes a chemical change?. 1 alcohol evaporates. 2. water vapor forms snowflakes. 3. table salt is crushed into powder. 4. glucose (C6H12O6) and oxygen produce CO2 and H20.

A reaction has an equilibrium constant of 7.9*10³ at 298 K. At 713 K, the equilibrium constant is 0.77. Do you predict that the enthalpy of the reaction is positive or negative? Why? a.

Krypton gas is 21 times denser than helium gas at the same temperature and pressure. which gas is predicted to effuse faster

To measure temperature scientists used?

If 4 miles of sodium react, how many moles of chlorine gas will react? 2Na + Cl2 - - - > 2NaCl

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.

Write the isotope symbol for two isotopes of the same element. What makes the isotopes different? How are they similar?

According to the periodic table, which element has an atomic number of 40? a. u b. ca c. zr d. np

3. Which word best fits with the Earth's day and night cycle a. Revolution b. Rotation C Orbit d. Axis