|
Chemistry kategorisi hakkında
|
|
0
|
166
|
Ekim 16, 2022
|
|
Reaksiyon tamamlama
|
|
1
|
379
|
Kasım 23, 2023
|
|
Calculate the potential difference if 20j of energy are transferred by 8c of charge
|
|
1
|
1389
|
Ekim 2, 2023
|
|
There are two main isotopes of chlorine. 75% of chlorine atoms have a mass number of 35, while 25% have a mass number of 37. use this information to work out the relative atomic mass of chlorine
|
|
1
|
141
|
Ekim 2, 2023
|
|
Mercury metal is poured into a graduated cylinder that holds exactly 22.5 ml. the mercury used to fill the cylinder weighs 306.0 g. from this information, calculate the density of mercury
|
|
1
|
183
|
Eylül 21, 2023
|
|
What does a coefficient represent in a chemical formula?
|
|
1
|
174
|
Eylül 21, 2023
|
|
How to find the area of a polygon
|
|
1
|
140
|
Eylül 13, 2023
|
|
How can you calculate the number of neutrons in an atom
|
|
1
|
163
|
Eylül 13, 2023
|
|
A ph of 6 is how many times more acidic than a ph of 9?
|
|
1
|
173
|
Eylül 12, 2023
|
|
Marie discovers boxes of elements in a storage room. the boxes do not say which elements they contain, but they do have information about their locations on the periodic table
|
|
1
|
305
|
Eylül 12, 2023
|
|
Students want to determine the impact of soil erosion from the development of new housing. they plan to measure the density of a species of algae growing along the bottom of a river that flows through their town. the town is built
|
|
1
|
422
|
Eylül 11, 2023
|
|
How do we determine the number of electrons an element has
|
|
1
|
151
|
Eylül 11, 2023
|
|
Copper has an isotope with an atomic mass of 62.93 and an abundance of 69.17%. a second isotope has an atomic mass of 64.93 and an abundance of 30.83%. what is the average atomic mass for copper?
|
|
1
|
127
|
Eylül 8, 2023
|
|
Antimony has two naturally occuring isotopes, sb121 and sb123 . sb121 has an atomic mass of 120.9038 u , and sb123 has an atomic mass of 122.9042 u
|
|
1
|
120
|
Eylül 8, 2023
|
|
What is the molar mass of an unknown gas with a density of 2.00 g/l at 1.00 atm and 25.0 °c?
|
|
1
|
495
|
Eylül 8, 2023
|
|
What is the formula used to calculate density?
|
|
3
|
135
|
Eylül 8, 2023
|
|
What is another name for a condensation reaction?
|
|
1
|
133
|
Eylül 6, 2023
|
|
Which part of an amino acid is always acidic?
|
|
1
|
123
|
Eylül 5, 2023
|
|
Which of the following properties of carbon distinguishes it from all other elements?
|
|
1
|
117
|
Eylül 5, 2023
|
|
What information does not need to be included on a chemical waste label?
|
|
1
|
172
|
Eylül 4, 2023
|
|
Which of the following is not produced through chemical bonding?
|
|
1
|
141
|
Eylül 2, 2023
|
|
An ionic bond involves _____
|
|
1
|
257
|
Eylül 2, 2023
|
|
What is the vapor pressure of a solution made from 23.5 g of glycerin in 130 g of methanol at 50 °c? the vapor pressure of pure methanol at 50 °c is 400 torr. report your answer in torr and round to the first decimal place
|
|
1
|
284
|
Ağustos 31, 2023
|
|
Which process is the total of all the chemical reactions in an organism?
|
|
1
|
212
|
Ağustos 29, 2023
|
|
What determines the types of chemical reactions that an atom participates in?
|
|
1
|
272
|
Ağustos 28, 2023
|
|
Which of these refers to atoms with the same atomic number but different atomic masses?
|
|
1
|
136
|
Ağustos 28, 2023
|
|
A block of aluminum occupies a volume of 15.0 ml and weighs 40.5 g. what is its density?
|
|
1
|
207
|
Ağustos 28, 2023
|
|
How many valence electrons does carbon have?
|
|
1
|
215
|
Ağustos 22, 2023
|
|
İf an atom has 35 protons in the nucleus how many electrons will it have orbiting the nucleus
|
|
1
|
148
|
Ağustos 22, 2023
|
|
Most chemicals can be cleaned up with a general spill kit, but a few chemicals require specialized spill procedures
|
|
1
|
403
|
Ağustos 22, 2023
|