Chemistry Questions

What is the purpose of the written conclusion in an experiment?
2 Answers
Calculate the number of ATOMS in 1.0 mole of O2.
2 Answers
An ionic solid is placed in a beaker of water. Which of the following occurs when there is a strong attraction between the solute and the solvent?A. The solute melts.B. The solute dissolves.C. The solute remains intact.D. The solute reacts to form a precipitate.
2 Answers
What is the volume of 0.200 mol of an ideal gas at 200 kPa and 400 K?A. 0.83 LB. 3.33 LC. 5.60 LD. 20.8 L
1 Answers
Which radioisotope emits alpha particles?(1) Fe-53 (3) Au-198(2) Sr-90 (4) Pu-239
2 Answers
A sample contains 6.25 percent parent isotope and 93.75 percent daughter isotopes. If the half-life of the parent isotope is 58 years, how old is the sample?
2 Answers
The wavelength of a given region of the electromagnetic spectrum ranges from 1 x 10-11 - 1 x 10-8 meters. Which waves are found in this region?
1 Answers
Which statement correctly describes a chemical equilibrium? it must take place in an open system the mass of the reactants and the mass of the products are no equal it is affected by the addition of a catalyst it does not involve a reversible reaction the concentrations of reactants and products are equal
2 Answers
What are the phase change processes taking place when a substance is in equilibrium between liquid and gas phases? A. Melting and boiling B. Expanding and contracting C. Evaporating and condensing D. Freezing and thawing
2 Answers
Using the atomic masses and relative abundance of the isotopes of nitrogen given below, determine the average atomic mass of nitrogen. N-14: 14.003 amu; 99.63% N-15: 15.000 amu; 0.37%
1 Answers
Which is denser, isopropyll alcohol( rubbing alchohol) or water?
2 Answers
If the nucleus was the size of a tennis ball the atom would be the size of....?
2 Answers
What are some examples of upthrust force?
2 Answers
Is this statement true or false?Living things are classified by the characteristics they have in common.
2 Answers
MATCH THE FOLLOWING!!!(match each instrument with its description)1. weather maps/satellite 2. Doppler radar 3. radiosonde 4. wind vane 5. psychrometer __________________________________________________________________________A. uses two thermometers; a dry and wet bulb B. points in the direction winds are coming from C. uses frequency waves to track particle movement D. used to help track air masses and fronts E. carried with a weather balloon
2 Answers
Which characteristics both generally decrease when the elements in Period 3 on the Periodic Table are considered in order from left to right?(1) nonmetallic properties and atomic radius(2) nonmetallic properties and ionization energy(3) metallic properties and atomic radius(4) metallic properties and ionization energy
2 Answers
What is the empirical formula for a compoundwith the molecular formula C6H12Cl2O2?(1) CHClO (3) C3H6ClO(2) CH2ClO (4) C6H12Cl2O2
2 Answers
Which statement describes one characteristic of an operating electrolytic cell?(1) It produces electrical energy.(2) It requires an external energy source.(3) It uses radioactive nuclides.(4) It undergoes a spontaneous redox reaction.
1 Answers