An element is a pure substance. It can not easily be broken down into parts by physical means.

A) True

B) False

How many moles is 24 grams of carbon?

What would happen to the size of a helium balloon as it moves higher into the atmosphere (pressure decreases with altitude) ? And why you would hear air rushing out from a bottle of non-carbonated water that has been sitting out on a hot day?

Which configuration of a phospholipid would you expect to see in the presence of water?

Some kayakers coat the bottom of their kayaks with wax to make them more slippery. Kayakers wax their boats to A. reduce the work output. B. reduce the weight of the kayak. C. reduce their input force. D. reduce the speed the boat travels in water.

Which quantities are conserved in all oxidation-reduction reactions?

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