The mass of a single iron atom is 9.28*10-23 grams. How many iron atoms would there be in 91.5 milligrams of iron?

Explain why scientists use models

When it is winter, the United States receives the least direct solar energy, as compared with the rest of the year. Why does this happen?

What do you call everything to the "right" of the arrow in a chemical reaction?

Estimate the volume, v, of one sodium atom (na) using its metallic radius of 186 pm. express your answer with the appropriate units.

Lana balanced an equation so that the result was 2c2h3br 5o2 → 4co2 2h2o 2hbr. which most likely represents the starting equation?

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