An atom has a mass number of 9 and 5 neutrons. What is its atomic number?

The mass of an object is 100 g and its volume is 500 cm^3. What is the object's density in units of kg / m^3

All molecules are always made of

What is the specific heat of an object that weighs 15 G in changes temperature from 30 degrees Celsius to 37 degrees C when 50 joules of heat is added

Aluminum Oxide is formed when aluminum combines with oxygen in the air. How many grams of Al2O3 are formed when 23.6g of Al reacts completely with oxygen? 4 Al + 3 O2 - > 2 Al2O3 A. 44.6 grams B. 35.6 grams C. 87.6 grams D. 21.6 grams

If the atomic number of an element remains the same but the number of neutrons has been increased, which factor has been changed in that element? the number of electrons the chemical symbol the number of protons the mass number

Which pair of nitrogen bases will form a bond in a DNA molecule? a. cytosine and adenine b. adenine and thymine c. guanine and thymine d. thymine and cytosine

Most meteors that fall into the earths atmosphere burn up before reaching the ground. Why is this?

Imagine a chemist is in the lab and trying to make some chemical reactions happen. In one reaction she reacts chemicals in an exothermic reaction and there is an increase in entropy.

Which of the following requires an oxidizing agent? Al yields Al3+ 2 O yields O2 Cl2 yields 2 Cl- Ag + yields Ag

Type of ion formed by group 2A elements