What 4 elements did people originally think made up everything?

When light is reflected by a mirror, the angel of incidence is always

A chemical reaction release 55.2 kcal. How many kilojoules does this correspond to?

The density of benzene at 15 °c is 0.8787 g/ml. Calculate the mass of 0.1500 l of benzene at this temperature. Enter your answer in terms of grams

How do you find the atoms of nitrogen in this substance (NH4) 2CO3?

Function C gives the cost, in dollars, of buying n apples. 6. Which statement best represents the meaning of C (10) = 9? a. the cost of buying 9 apples b. the cost of 9 apples is $10 c. the cost of 10 apples d. ten apples cost $9

Give 2 examples of force pairs that occur when you clean your room?

Which branch of musicology might study the reasons as to why you like rock music and your friend like country music?

Consider the statement, In the following process, the number of particles increases, so ΔS for this process must be positive. MgS (s) ⇄ Mg2 + (aq) + S2 - (aq) Is this statement true?

How do you read a data table?

In the manufacturing process of sulfuric acid, sulfur dioxide is reacted with oxygen to produce sulfur trioxide.