As early as 400 B.C., Greek philosophers proposed that matter was made up of particles. During...
Use the law of conservation of mass to answer the questions. Consider a hypothetical reaction in which A and B are reactants and C and D are products. If 13 g of A completely reacts with 21 g of B to produce 18 g of C, how many grams of D will be produced? A 3.6 g sample of sodium hydrogen carbonate is added to a solution of acetic acid weighing 10.1 g. The two substances react, releasing carbon dioxide...
HI CAN SOMEONE HELP ME WITH THIS 2 QUESHTIONS PLEASE ITS URGENTLY I DONT UNDER STAND THEM.!!!!!!! my school school closed and I need help rapidly 1.The discovery of the electron contradicted which statement in DaltonÕs atomic theory? A. All matter consists of small indivisible particles called atoms. B. Atoms of different elements have different masses. C. Chemical reactions involve the rearrangement of atoms. D. Atoms are neither created nor destroyed in chemical reactions. 2.Compared to the properties of their...
atom question significant thank you atomic theory of matter Chemistry | early atomic theory I general chemistry | isotope POINTS: DIFFICULTY: Easy REFERENCES: 2.5 QUESTION TYPE: Multiple Choice HAS VARIABLES: False KEYWORDS: OTHER: Conceptual DATE CREATED: 3/4/2016 4:31 PM DATE MODIFIED: 2/17/2017 1:56 AM 28. An isotope, X, of a particular element has an atomic number of 8 and a mass number of 18. Therefore: a. X is an isotope of oxygen. b. X has 10 neutrons per atom. c....
Exam Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) 1) One mole of any substance contains Avogadro's number of particles of that substance. What is the numerical value of Avogadro's number? A) 12.01 23 Avagrans t Male aton 6022 x1o atums B) 6.022 x 1023 C) 6.022 x 10-23 D) 1.661 x10-24 E) 1.00 x10-14 2) What is the mass of 4.00 moles of helium, the gas commonly used to fill...