A bullet of mass 10 g is fired from a gun of mass 490 g. The bullet leaves the gun with a speed of 120 ms-1. Find the speed of recoil of the gun.

A. 2.4 ms-1 B. 4.8 ms-1

C. 6.4 ms-1 D. 7.4 ms-1

True or false the nucleus of an atom is made of protons and neutrons

Water (h2o) and hydrogen peroxide (h2o2) both consist of hydrogen and oxygen atoms. Explain why they have different chemical and physical properties

Which group of elements contains a metalloid? (1) Group 8 (3) Group 16 (2) Group 2 (4) Group 18

Why are you more likely to see a lunar eclipse than a solar eclipse? When does a lunar eclipse occur?

What happens to substances during a chemical change

After pyruvate oxidation, the chemical energy of how many carbons of the original glucose molecule is converted to chemical energy in the form of atp in the remaining steps of cellular respiration?

What do you call all elements that are clearly not metals? ? nonmetals ? metalloids

Which of the slightly soluble salts below will be more soluble in acidic solution than in pure water? a. Mg (OH) 2 b. CaCO3 c. AgCl Mg (OH) 2 d. only Mg (OH) 2, e. CaCO3, and f. AgCl g. CaCO3 only h. both Mg (OH) 2 and CaCO3

What type of chemical bond is formed between two atoms of bromine 1. Metallic 2. hydrogen 3. Ionic 4. covalent

Before oceanography was recognized as its own branch of science it was part of A. Physics B. Chemistry C. Geometry D. Natural science