Washing soda is a hydrate of sodium carbonate. Its formula is Na2CO3. x H2O. A 2.714 g Sample of washing soda is heated until a constant mass of 1.006 g of Na2CO3 is reached. What is x?

Krypton-79 has a half-life of 35 hours. how many half-lives have passed after 105 hours?

How would your calculated %P2O5 value be affected if you had not used this blank solution

If 30g of HCl is dissolved and 10g of NaCl is produced, what is the theoretical yield of the experiment?

A laboratory procedure calls for making 410.0mL of a 1.2M NaNO3 solution. What mass of NaNO3 (in g) is needed?

Identify the products and reactants involved and the type of chemical reaction shown below. SO3 (g) + H2O (l) → H2SO4 (aq)

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