Which of the following are mixtures?
salt water
water (H2O)
salt (NaCl)
air (mostly N2 and O2)
Which of the following are mixtures? salt water water (H2O) salt (NaCl) air (mostly N2 and...
Which of the following are mixtures? water (HO) salt water salt (NaCl) air (mostly N, and O2) O Classify each substance as an element, a compound, a homogeneous mixture, or a heterogeneous mixture. Element Compound Homogeneous mixture Heterogeneous mixture Answer Bank Classify the phrases pertaining to pure substances and mixtures as either true or false. True False Answer Bank Components of a homogeneous mixture are visibly distinct The components of homogeneous and heterogeneous mixtures cannot be separated Homogeneous mixtures have...
Which has the highest entropy? (1 point ) * C(s) CH4(g) H2O(l) H2O(s) Which has lowest entropy? (1 point ) * H2O(l) NaCl(s) O2(g) sugar (aq) Which has largest entropy? (1 point ) * .01 L H2O 0.5L N2 at STP 1 L Ar(g) at 4 K 1L O2 at STP Which has lowest entropy? (1 point ) * air ice cubes liquid water space
Determine the air to fuel ratio for a stoichiometric mix of of Ethane (C2H6) and Air (O2+3.76N2). The products are CO2 and H2O and N2. (Molecular Weight of C2H6=30, O2=32, N2=28, CO2=44, H2O=18).
which of the following is an example of a molecule? A. carbon dioxide CO2 B. water H2O C. oxygen in the atmosphere O2 D. sodium chloride: table salt NaCl E. all of these
1. Consider the dissolution of an ionic salt in water. Which of the following statements best explains why this process is considered a physical change? (A) The ionic salt can be recovered by evaporation of the water. (B) The ionic salt can be recovered by solidification of the water. (C) Dissolution of an ionic salt is mostly a physical change, and all physical changes are reversible. (D) Dissolution of an ionic salt is mostly a chemical change, and all chemical...
2. The data below have been obtained for the liquid-vapor equilibrium compositions of mixtures of nitrogen (N2) and oxygen (O2) at 100 kPa. When a liquid contains 21% O2 and 79% N2, answer the following question (a) Which one is more volatile? N2 or O2? (b) When the liquid with 21% O2 was heated at 100 kPa, at what temperature the first bubble formed? What is the concentration of O2 in the first bubble? (c) As the last drop of...
People commonly dissolve table salt (NaCL) into water that they are heating up. a) If you had a pot with 4 quarts of water (before heating) and add 1 teaspoon of salt, which is equivalent to 6.20g, what is the boiling point of the water? How much of an effect will that have on cooking pasta? (You can assume that NaCl fully dissociates. 1quart=0.946 L and Kb=0.51oCkg/mol for water) b) Would the cooking of pasta (based on boiling point) be...
PEIT A What mass of salt (NaCl) should you add to 1.90 L of water in an ice cream maker to make a solution that freezes at-11.4 C ? Assume complete dissociation of the NaCl and density of 1.00 g/mL for water. VAE ? m(NaCl) Request Answer Submit PEIT A What mass of salt (NaCl) should you add to 1.90 L of water in an ice cream maker to make a solution that freezes at-11.4 C ? Assume complete dissociation...
Using the a portion of the H2O–NaCl phase diagram to answer problem a. At what temperature is salt no longer useful in causing ice to melt? b. Determine the solubility limit of salt in water at 0 oC c. Specify the number of degrees of freedom for 10 wt% NaCl – 90 wt% H2O at -5 oC, -17 oC, and -27 oC 10 10 20 30 L NaCl H20 100 Liquid rine Ice Liquid (brine) Ice Salt 10 20 90...
Identify the type of bonding that is present in: N2, O2, HCl, H2O, NH3, SO2, BeCl2, BF3NH3, B2H6, NaCl, CaCl2, KBr, and Ca3(PO4)2 Please put the answer in a complete sentence and if there is more than one of bonding present, all types of bonding must be identified. 2. Identify the type of bonding that is present in The instructors will choose one of the compounds in this list: N2, O2, HCI, H2O, NH3, SO2, BeCl2, BF3NH3, B2H6, NaCl, CaCl2,...