What is meant by controlled variable in chemistry

Which series of atomic numbers represents the ordering of consecutive elements within the periodic table? 10, 20, 30, 40 ... 2, 4, 8, 16 ... 1, 3, 5, 7 ... 1, 2, 3, 4 ...

What does pressure measure? O Am The number of molecules present O B. The temperature of a substance O. C. The force of colliding particles O D. The volume occupied by particles

If you burn 50.4 g of hydrogen and produce 4.50 * 102 g of water, how much oxygen reacted?

Determine the concentration of a solution made by dissolving 1.40grams NaCL in enough water to make 30.0mL of solution.

The formation of water from oxygen and hydrogen can be described in the following word equation: oxygen gas + hydrogen gas - liquid water In this reaction, liquid water is the Select one: •only compounds •product •waste •reactant

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