Which situation describes a chemical change?
a. baking soda added to vinegar gives off carbon dioxide gas.
b. rubbing pencil lead onto paper changes the color of the paper.
c. chocolate changes from a solid to a liquid when heated.
d. clay pressed into a mold takes on the shape of the mold.
Answers: 1
Chemistry, 22.06.2019 03:30
The atomic radius of sodium is 186 pm and of chlorine is 100 pm. the ionic radius for na+ is 102 pm and for cl– is 181 pm. in going from na to cl in period 3, why does the atomic radius decrease while the ionic radius increases? a. the inner electrons in the sodium cation shield its valence electrons more effectively than the inner electrons in the chloride anion do. b. the inner electrons shield the valence electrons more effectively in the chlorine atom than in the chloride anion. c. the outermost electrons in chloride experience a smaller effective nuclear charge than those in the sodium cation do. d. the outermost electrons in chloride experience a larger effective nuclear charge than those in the sodium cation do. e. monatomic ions are bigger than the atoms from which they are formed.
Answers: 2
Chemistry, 22.06.2019 10:30
Apiece of metal with a length of 1.42 cm was measured using four different instruments. which of the following measurements is the most accurate?
Answers: 3
Chemistry, 22.06.2019 14:50
Which of the following is most likely true about water in chemical systems? a) water dissolves nonpolar ionic compounds. b) water dissociates ionic compounds. c) water dissociates covalent molecules. d) water dissolves nonpolar covalent substances.
Answers: 1
Chemistry, 22.06.2019 20:00
Nitrogen dioxide decomposes according to the reaction 2 no2(g) ⇌ 2 no(g) + o2(g) where kp = 4.48 × 10−13 at a certain temperature. if 0.70 atm of no2 is added to a container and allowed to come to equilibrium, what are the equilibrium partial pressures of no(g) and o2(g)
Answers: 2
Which situation describes a chemical change?
a. baking soda added to vinegar gives off carbon dioxi...
History, 16.03.2020 01:07
English, 16.03.2020 01:07
Chemistry, 16.03.2020 01:07
Mathematics, 16.03.2020 01:07
Business, 16.03.2020 01:08
Mathematics, 16.03.2020 01:08
English, 16.03.2020 01:08
Mathematics, 16.03.2020 01:08
Mathematics, 16.03.2020 01:09
Mathematics, 16.03.2020 01:09
Mathematics, 16.03.2020 01:09