Questions by Jeff Wright

Questions by Jeff Wright

Which of the following is correct? A) 23Na, 11 protons, 11 neutrons, 12 electrons B)40Ar, 18 protons, 22 neutrons, 18 electrons C)238U, 238 protons, 238 neutrons, 238 electrons D)55Fe, 26 protons, 29 neutrons,

asked Jul 24, 2019

1 answer

2 votes

58.9k views

1. In Linnaeus's time, all living things were grouped into two kingdoms. Later, there were five kingdomes, and now we have six kingdoms. What is the main reason for this increase in the number of kingdoms?

asked Jun 7, 2019

1 answer

3 votes

565 views

Part 1: A sample of silver (Ag) has a mass of 31.78 g. a. What is the molar mass of silver? b. How many moles of silver are in this particular 31.78 g sample? c. How many atoms of silver are in this same

asked Apr 15, 2019

1 answer

1 vote

146k views

Which ratio correctly compares 5 m to 100 cm, when the lengths are written using the same units? Note: 100 cm = 1 m 20:1 1:20 5:1 1:5

asked Jul 11, 2018

2 answers

4 votes

214k views

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