KnowledgeJunction
Home
Search
Register
Login
Search
Chemistry
Chemistry
High School
Calcular el porcentaje de cada elemento en los compuestos qumicos dados.1. KNO3 (Nitrato de potasio: fertilizante): %K=? , %N=? , %O=?
Chemistry
High School
Scientists use carbon dating to determine the age of fossils. 14C is a rare isotope of carbon that has a half life of 5730 years and decays into 14N. By measuring the amount of 14C remaining in a fossil, scientists can estimate when the organism died out to about 60,000 years. The atomic number of C is 6, and of N is 7. 14C and 14N have the same: Group of answer choices
Chemistry
High School
Which of the following answer describes 1-pentyne? O structure should have 5 carbon with double bond beginning on the 1st carbon atomO structure should have 6 carbon with triple bond beginning on the 1st carbon atomO structure should have 6 carbon with double bond beginning on the 1st carbon atomO structure should have 5 carbon with triple bond beginning on the 1st carbon atom
Chemistry
College
A sample of O2 gas is put into a bottle at STP. If the volume of the bottle is 0.52 L, how many moles of O2 will the bottle contain?please help!!
Chemistry
High School
What is the percent yield of a reaction that has a theoretical yield of 50.0 grams of product but after an experiment you only collect 40 grams of product?
Chemistry
High School
I will mark you as brianliest if you answer this questionwhat is difference between pipette and flask?
Chemistry
High School
help me balence: ___ H2 + ___ O2----> _____ H20
Chemistry
College
Please help out thanks
Chemistry
High School
A mixture of He, Ne, and N2 gases has a pressure of 1.943 atm. If the pressures of He and Ne are 0.137 atm and 0.566 atm, respectively, what is the partial pressure of N2 in the mixture? A. 0.703 atm B. 1.24 atm C. 0.151 atm D. 1.943 atm
Chemistry
High School
what is the ideal gas constant?A.it is a constant that applies only at STPB.it is a specific constant for a specific gas C.it is constant that depends on the conditions D.it is a universal constant for all glasses
Chemistry
High School
What do electrons Do in ionic bond? Do they transfer from metals to no metals or nonmetal to metals?
Chemistry
High School
How much heat does it take to turn water from -30 degreesC to 120 degreesC? If you actually know the answer please tell me! ASAP!!!
Chemistry
High School
Which rock among the given rocks is most likely to erode away the fastest?Please give 1 answer.A.MarbleB.Granitec.SandstoneD.Basalt
Chemistry
Middle School
please answer this in a hurry will give 10 ptsdue tommorow
Chemistry
High School
Hippos spend most of their time in rivers, but they come out of the water to eat grass. Right now, it's the middle of the night. The sun is not shining, and the hippos are not eating. What is happening to the carbon in the air around the hippos and the grass nearby?
Chemistry
High School
increases/decreases from left to right across a period.WHY do we observe this periodic trend?
Chemistry
High School
If 0.500 moles of silver nitrate were consumed, how many moles of calcium nitrate would be produced?(make sure to balance the chemical equation first)AgNO3 + CaCl2 Ca(NO3)2 + AgCl
Chemistry
High School
The temperature of evaporation is much higher for water than for alcohol. Without knowing more about the chemistry of alcohol, which of the following is the most logical chemical explanation for this phenomenon? Group of answer choices Ionic bonds form between alcohol molecules. These are the weakest type of bond and are easier to break than the hydrogen bonds between water molecules. Fewer hydrogen bonds form between alcohol molecules. As a result, less heat is needed for alcohol molecules to break away from solution and enter the air. Alcohol has a higher surface tension than water. This means that alcohol molecules can easily break away from other alcohol molecules and evaporate at a lower temperature. Alcohol molecules are more cohesive than water molecules. This means that as alcohol molecules evaporate, they pull other alcohol molecules into the air along with them.
Chemistry
College
A student dissolved a 40-gram block of a salt in 100 grams of warm water at 45C. The solution was allowed to cool down to 24C. The student noticed that some of the salt came out of the solution and settled to the bottom of the beaker. It is later determined that 12 grams of the salt came out of the solution. How many grams of the salt were dissolved in the solution at 24c 100 grams of warm water , PLEASE HELP ME FAST I ONLY HAVE A COUPLE MIN LEFT TOFINISH I WILL GIVE YU BRAINLIEST!
Chemistry
High School
Write a balanced nuclear equation for the alpha decay of titanium-45.
Chemistry
High School
what is the volume of 72g of copper has a density of 9/cm 3
Chemistry
College
A solution contains Al3 and Co2 . The addition of 0.3868 L of 1.707 M NaOH results in the complete precipitation of the ions as Al(OH)3 and Co(OH)2 . The total mass of the precipitate is 23.36 g . Find the masses of Al3 and Co2 in the solution.
Chemistry
High School
A baseball player hits a ball. Which is the best description of the energy of the ball as it flies over the pitcher's head?O chemicalO kineticO nuclearO thermal
Chemistry
College
What is the molarity of 20.2 g of potassium nitrate, KNO3, in enough water to make 250.0 mL of solution
« Previous
Page 1
Next »