The percent by mass of carbon in a molecule of CO_(2) is 27.3% What is the percent by mass of oxygen in a CO_(2) molecule? 100% 72.7% 27.3% 36.4%

Nombre: __ Asigna números de oxidación a cada una de las especies. AgNO_(3)=H_(2)O=HClO_(4)= MgCl_(2)=CaCl_(2)=H_(2)SO_(4)= LiF=KOH=FeCl_(3)= K_(2)Cr_(2)O_(7)=Ca(OH)_(2)=H_(2) Al_(2)O_(3)=KNO_(3)=H_(3)PO_(4)= Li NaHCO_(3)=O_(2) - 02

What must fuel oil be changed to before it can burn? liquid vapor plasma emulsion

8-Give two sources of potential mistakes in the Titration experiment. Explain it. (Lab: Titration) 9-Which test confirmed the presence of glucose outside the dialysis bag? (Lab:Dialysis, Solution Concentration) 10-What conclusion can be drawn if no starch is detected outside the dialysis bag after 30 minutes? (Lab: Dialysis, Solution Concentration)

How many moles of CO_(2) are in 2.50times 10^24 molecules of CO_(2)

What is the mole ratio of Li to LiBr 2:2 1:2 2:1 1:4

The pH of pure water is square . Looking through the magnifying glass it is evident that in pure water there are equal amounts of positively charged square ions and negatively charged hydroxide v ions. The double arrow in the reaction equation shown below the solution indicates that the reaction is reversible

All elements on the periodic table are neutral (no electrical charge), why?. Equal number of protons and neutrons More neutrons than electrons Same amount of protons and electrons Less amount of protons than Electrons

The conjugate base of water when a strong base is in aqueous solution is the square ion. The concentration of square ions in aqueous solution is much square in a solution of strong base in comparison to a solution of weak base. The pH of an aqueous solution of strong base is much square than the pH of a weak base. According to the digital pH meter, the pH of the weak base in the simulation is square The pH of the strong base is square

20. Groups of elements in the periodic table that are share similar properties are referred to: a. families b. periods c. solutions d. compounds

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Before you go, which type of molecule would you choose to be the anode in a lithium battery? a) The metal with the most negative potential b) It does not matter since lithium's potential is so negative c) The metal with the most positive potential d) Another lithium compound

Part I: Unit Conversions.Show all work (known and unknown, and dimensional analysis - including units! Write your answers in the boxes provided. Unit Test: Dimensional Analysis and Mole Convers 1. Find the number of minutes in 25 years, assuming that $1year=365days$ K:25 years 2. The driving distance from Spokane to Seattle is 479,000 meters. Convert this distance to miles given $1m=100cm,1in=2.54cm,12in=1ft,$ and $1mi=5280ft$ $\square $ Part II: Mole Conversions . Show all work (known and unknown, and dimensional analysis - including units! Write your answers in the boxes provided. 3. A sample contains $9.2\times 10^{22}$ atoms of beryllium (Be)How many moles is this? $\square $ 4. The formula for Aluminum Carbonate is $Al_{2}(CO_{3})_{3}$ What is the molar mass of aluminum carbonate? $\square $

The following reaction is an example of a substitution reaction. $2Na+Cl_{2}\rightarrow 2NaCl$ TRUE FALSE

Heterogeneous mixtures are observed to be uniform throughout. True False

What are some examples of foods that need an emulsifier mayonnaise chocolate ice-cream oil water various salad dressings.

27. The contents of a drum have not been identified. You notice crystalline material on top of the drum, you should treat the contents as: A. shock-sensitive waste. B. nearly empty. C. containing chlorinated solvent. D. containing caustic materials.

A weak acid is a dilute acid that is not very powerful. True False

What is a crucial aspect of chemical optimization? Adjusting team member speed Pre-treating the vehicle Using water reclamation tanks Ordering new equipment

Why is chemistry sometimes referred to as the "central science?" Because we need to know it to survive as a species. Because it is interconnected with many other STEM disciplines. Because it incorporates principles from math and physics. Because there are many subdisciplines of science that rely on chemistry.

Malia was able to make a paperclip float on the surface of water. What will most likely happen to the paperclip if a drop o dishwashing detergent is added near it? Soap is a surfactant that increases the intermolecular forces of water allowing the paperclip to continue to float. Soap makes the water less viscous making the paperclip sink. Soap is a surfactant that disrupts the intermolecular forces of water making the paperclip sink. Soap makes the water more viscous allowing the paperclip to continue to float.