9. A 50.0 mathrm(~g) sample of tungsten loses 5,687 mathrm(~J) of energy tends up with a temperature of 145.0^circ mathrm(C) . What was its initial temperature?

What mass of AgBr is formed when 35.5 mL of 0.184 M AgNO_(3) is treated with an excess of aqueous hydrobromic acid? 53.69 1.239 1.44 g 34.5g

5. Balance the following equations by adding the correct coefficients. a. Na+Cl_(2)arrow NaCl b. Mg+N_(2)arrow Mg_(3)N_(2)

What do we need to help us indicate the charge of a cation? Valence Electron Roman Numeral

How many moles of oxygen atoms are there in 2 moles of Al_(2)(CO_(3))_(3) Please answer to the nearest integer. You do not need to include units in your answer. Answer: square

1. Explain How can you express the rate of a chemical reaction? 2. Identify List the four factors that can influ- ence the rate of a chemical reaction. 3. Describe A thin, 0.2-mol sheet of zinc is com- pletely converted to zinc oxide (ZnO) in one month. How would you express the rate of conversion of the zinc? 4. Summarize Does every collision between react- ing particles lead to products? Explain.

18. A solution is prepared by dissolving 32 .0 g of NiSO_(4) in water. What current would be needed to deposit all of the nickel in 5.0 hours? A. 1.1 A B. 2.2 A C. 3.3 A D. 4.4 A E. 5.5 A

2. What is the main Intermolecular force present in each of the following compounds? a. C_(5)H_(12) b. C_(2)H_(4)OH c. HCI d. F_(2) e. CO f. H_(2)O

9. (6 points)Using two or more of the following reactions. N2(g)+3/2O2(g)arrow N2O3(g)Delta H=+83.7kJ N2(g)+O2(g)arrow 2NO(g)Delta H=+180.4kJ 1/2N2(g)+O2(g)arrow NO2(g)Delta H=+33.2kJ Determine the Delta H^circ of the following reaction: NO(g)+NO2(g)arrow N2O3(g)Delta H=?

4x Josh decided to mix some vinegar with baking soda. He knew that a reaction occurred because he made careful observations. He noted that the mixture started to foam up and bubble and was white in color. How did Josh know that a chemical reaction occurred? He was sure a reaction occurred because of A the formation of a gas B the color of the mixture. C the smell of the vinegar. D D the volume of the mixture.

Hot Questions

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.