According to the Periodic Table of Elements, Calcium has:

A. 20 protons and 20 electrons

B. 40.08 protons

C. 20 protons and 20.08 electrons

D. 20 protons and zero electrons

Breads and other whole grain foods are composed of very large polysaccharide molecules which contain hydrogen, oxygen, and which other element? A) carbonB) ironC) nitrogenD) water

What do elements in the first two columns of the periodic table have in common

5.21cm is the same distance as

Which of the following statements correctly distinguishes between an acidic and a basic solution? A. An acidic solution contains a high ratio of hydrogen ions to hydroxide ions and a basic solution contains a ratio that is closer to one. B.

Chromium metal is plated onto a car bumper at a current of 10.0 amperes for 100 seconds. The plating bath contains chromium in the form of CrO42 - ions. How many grams of Cr are deposited in this process? (The atomic weight of Cr is 51.996 amu.)

Water has a specific heat of 4184 J / (kgK) how much energy is needed to increase the temperature os a kilogram of water 5C?

A student noticed while doing the neutralization experiment that the calorimeter kept getting warmer. how would this error affect the final calculation for the δhneut of each reaction? would it be overestimated, underestimated or remain unaffected?

A solution contains 45 grams of nitrogen gas and 40 grams of argon. What is the mole fraction of argon in this solution?

How is an animal cell related to tissue and organs

Predict the precipitate produced by mixing an Al (NO3) 3 solution. write the net ionic equation for the reaction. include the states of matter