General Questions and Answers

stion 16 What will be the new volume if 2 L of gas at sea level where the pressure is 1 0 atm is brought to a pressure of 1 atm the temperature remaining constant Input your answer in liters rounded to two significant figures do not include units

What is the mass in grams of one molecule of NH3 Report your answer in grams to two significant figures do not include units on your answer

If 4 9 moles of an element have a mass of 120 grams what is its molar mass Enter your answer in g mol rounded to two significant figures do not include units A

Which of the following atoms is the smallest Oa All are the same size Ob Br O C K Od Kr O e Ca

The energy level containing the valence electrons in a main group element is given by O a its isotope number O b its period number O c its atomic number Od None are correct O e its group number

What is the total number of hydrogen atoms in NH4 2SO4 Oa None of these Ob 8 O c 12 O d 2 O e 4

Which of the following best describes a covalent bond O a Nonmetals only transfer of electrons b Metal and nonmetal sharing of electrons Oc All of the above d Metal and nonmetal transfer of electrons e Nonmetals only sharing of electrons

Predict the products for the following double displacement reaction Na2SO4 AIF 3 Note you do not need to check the solubility of the products and you do not need to balance the resulting equation just predict the products and type them in to the space provided As an example when entering subscripts H O would be entered as H20 If there are to more products separate each of the products by a plus sign

A compound containing C and H is decomposed in the laboratory and produces 2 89 grams of C and 0 606 g of H What is the empirical formula of the compound Input your answer as the subscripts in the chemical formula CxHy X y

14 Board How many moles of chlorine gas 35g 45 mol are present in a sphere container that has a radius of 5 000 cm stored at 60F and at 700N pressure 1 Point 15 631 moles Cl O 156 31 moles Cl 156 311 moles Cl 15 631 moles Cl

The answer to the correct number of significant figures for the problem 8 5 9 158 is O a None of these O b 18 O c 17 658 O d 17 7 Oe 17 66

Identify the literary device figurative language from the following statement Dea with him according to your wisdom but do not let his grey head go down to the grave in peace O Metaphor Hyperbole Euphemism

1 Nitrogen dioxide and water react to produce nitric acid HNO3 and nitrogen oxide 3NO H O 2HNO3 NO How many grams of H O are required to react with 28 0 g of NO b How many grams of NO are produced from 15 8 g of H O How many grams of HNO3 are produced from 8 25 g of NO 2 When solid lead II sulfide reacts with oxygen gas the products are solid lead II oxide and sulfur dioxide gas a Write a balanced chemical equation for the reaction How many grams of oxygen are required to react with 29 9 g of lead II sulfide

Describing Gases Draw a solid liquid gas and describe using the terms volume and shape definite or indefinite S L Pressure what are the common units of pressure and conversions for pressure STP What does STP mean G Temperature define temperature and describe what unit of temp gas laws are calculated in and how to get to that desired unit I

Which is not true of a neutralization reaction The ingestion of a substance to relieve excess stomach acid is an example An acid and a base react An ionic compound always results The pH of the reactants remain the same

Hydrogen cyanide HCN e is a pale blue highly volatile liquid It exists as gas abov 26 C It reacts with water to form H3O aq and CN aq Which of the following pairs are conjugate acid base pairs of the reaction of hydrogen cyanide HCN e with water O CN aq and H3O aq HCN aq and H3O aq HCN aq and H O e HCN aq and CN aq

GAS LAWS state the equation for each and tell what is help constant what the gra looks like and what type of relationship the variables have Boyle s Law Charles s law

After World War II the USSR extended its sphere of influence into Yugoslavia and Albania by O stationing troops there for many years O appointing the head of state in each nation Ogiving Soviet leaders local government jobs Osupporting the governments already in place

On which two plates would you expect to see only bacterial cells that have been genetically transformed Chose both from the options below O PGLO LB PGLO LB amp PGLO LB amp ara CLOUD

A 1 0 L sample of a gas at 0 8 atm of pressure is expanded until its volume is 1 4 L What will be the pressure in atm of the expanded gas sample Round your answer to 2 digits after the decimal place Your Answer

d OOC CH CH COO FAD OOC CH CH COO FADH

15 9g of CO2 gas are contained in 9 55L at 318K What is the pressure on this container by the gas R 0 0821Latm molek

Chemistry What mass g of Br2 is contained in 22 0L at 212K if the pressure is 2 1atm R 0 0821Latm molek then convert to g solve for moles 1st

2 Which statement is true a Reduction is gaining electrons and an increase in charge b Reduction is losing electrons and an increase in charge c Reduction is losing electrons and a decrease in charge d Reduction is gaining electrons and decrease in charge 3 Which of the following shows a balanced oxidation half reaction a Li 1 e1 Li Li b Lio e c Li 1 Li e 1 d LioLi e

5 Given the following reaction 2Na MgCl2 2NaCl Mg a Assign oxidation numbers to all species in the reaction write the oxidation number in the boxes above the element b What element is losing electrons c What element is gaining electrons d What element is being oxidized e What element is being reduced f What ions are spectator ions if any g Write the balanced oxidation half reaction h Write the balanced reduction half reaction i Write the complete net ionic equation 2 points

5 In a Chemistry lab the directions might say pipette 1 10 of the 250 ml ion into another beaker Show the expression needed to calculate how much solution to transfer to the second beaker 6 Use cross multiplication to determine if the two fractions are equal 72 15 34 170

A quantity of molecular oxygen occupies a volume of 17 7 L at STP How many moles 2 are present

Which of the following statements regarding intermolecular forces is incorrect O An intermolecular force is an attractive force that operates between molecules O Bonding forces are much stronger than intermolecular forces O London dispersion forces occur in all atoms and molecules O London dispersion forces are the result of permanent dipoles in atoms or molecules O Molecules which have hydrogen bonded to F O or N can undergo hydrogen bonding

D 1 CH4 g O g CO g H O g II C H5OH C H5OH g III NaOH s Na aq OH aq OI II and III Oland II only Ol and Ill only OII and III only Ol only Question 14 Consider the following specific heats of metals Metal Specific Heat J g C 0 377 0 656 copper calcium aluminum 0 895 0 448 0 129 If the same amount of heat is added to 25 0 g of each of these metals all at the same initial temperature which metal will have the highest final tempe iron lead O copper O calcium O aluminum

A Sulfur dioxide 50 Nitric oxide NO Sulfuric acid H SO Nitric acid HNO3 Acid precipitation Use the illustration to answer these questions 1 What is represented by the arrow labeled A and what is its source 2 Which letter represents primary pollutants 3 What is one of the effects of the processes shown in this diagram Please answer in complete sentences 2 points for Arrow and and its source 1 point for primary pollutants 2 points for an effect of the processes shown in this diagram with an explanation

ng may change during a chemical reaction except O the total number of atoms in the system O the temperature of the system O the color of the system O the total number of molecules in the system O the physical state of the system Question 8 Which of the following solution best conducts electricity O ammonia NH3 O sodium chloride NaCl O acetic acid CH3COOH O sucrose C12H22011 methanol CH OH

Question 21 Given the equation 2X 3Y Z S if 2 5 moles of X reacts with 4 moles of Y which of the following is a limiting reactant in this reaction OX OY OZ OS O need more information

has a high melting point What type of solid is it metallic ionic O molecular Onetwork Oliquid crystal crystalline solid is very hard does not conduct electricity when solid or when melted Question 10 Which of the following processes is exothermic O boiling water to make tea O cooking an egg heating food in a microwave oven O an acid and base reacting together and causing the solution to become warm 3

Here s How the Coronavirus Pandemic Has Changed Our Lives in Some Positive Ways To say that the novel Coronavirus COVID 19 pandemic has changed the world would be an understatement Most of the media and news organizations highlighted the often devastating negative effects of the pandemic like chronic disease anxiety depression and other mental health issues and of course death The pandemic has changed how we work learn and interact as social distancing guidelines have led to a more virtual existence both personally and professional But a new survey commissioned by Parade Magazine and Cleveland Clinic reveals that the pandemic has also changed how Americans approach their health and health care in ways both positive and negative Conducted by Ipsos the survey was given to a nationally representative sample of 1000 American adults 18 years of age and older living in the U S Here are some of the positive effects Eating and exercise are new areas of focus for the survey respondents Many of them said that they will keep up their habits even after the pandemic subsides Also many respondents who increased their exercise frequency during the pandemic embracing the new advantages of working out at home Throughout the pandemic we ve seen both benefits and drawbacks of being cooped up with family for long periods of time Some reported positive experiences with their families in such close quarters they experienced a closer connection with family members and a more even share in housework chores Even those who had a difficult time social distancing themselves are now claiming that they have a newly found appreciation of their connections to people through friendships family relations and work relationships And some young people now claim that the long duration of the pandemic helped them re evaluate their life goals and changed their career plans especially regarding their education So despite the universally devastating of the COVID 19 virus many people were able to not only cope with the pandemic but were able to turn it into an often life enhancing experience Parade Magazine September 25 2020 Writing Directions Read the passage above and write an essay responding to the ideas it presents In your essay be sure to summarize the passage in your own words stating the author s most important ideas Develop your essay by identifying one idea in the passage that you feel is especially significant and explain its significance Support your claims with evidence or examples drawn from what you have read learned in school and or personally experienced Remember to review your essay and make any changes or corrections that will help your reader follow your thinking You will have 90 minutes to complete your essay

Which of the following single displacement reactions will not occur if the indicated reactants are mixed C Increasing activity K Ba St Ca Na 225828 82822242 Mn Zn Cr React with cold water to give H React with steam to give H React with acids to give H Do not react to give Hy m O Ni s 2 AgNO3 aq Ni NO3 2 aq 2 Ag s O Fe s Pb NO3 2 aq Fe NO3 2 aq Pb s O Zn s MgCl aq ZnCl aq Mg s 63 Mole 2 AICHL 2 MOCH 1 20Kel

Which of these atoms has the same electron configuration as the sulfide ion 2 O silicon Si argon Ar Ophosphorus P Ochlorine Cl

2 CzHo g 7Oz g 4 CO2 g 6 H O g O combination O decomposition O combustion single displacement O double displacement Question 6 Which of the following ionic compounds would be expected to be insoluble in water O KCI O PbCl O NH4NO3

following except Omass O melting point O vapor pressure boiling point O viscosity Question 2 by the strength of intermolecular forces include all of the Would an aqueous solution of CH3OH contain ions If so indicate the formulas of the ions in the solution O No this substance would not form ions in solution O yes CH3 aq OH aq O yes CH3 aq OH aq 3 pts

Use the following to answer questions 5 8 C3H8 50 4 H O 3 CO 5 32 grams of propane C3HB is burned in excess oxygen gas to produce how many grams of water Molar mass C3H 44 10g H O 18 00g 6 How many grams of oxygen gas is needed to make 30 grams of carbon dioxide Molar mass O 32 00 CO 44 01g 7 If 0 45 grams of water is formed during the combustion of propane how many grams of carbon dioxide is formed Molar mass H O 18 00g CO 44 01g How many grams of propane C3H8 are needed to make 140 grams of water

2 NaCl MgCl 1 If 24 grams of sodium chloride reacts with an excess amount of magnesium oxide how many grams of sodium oxide will be produced MgO Na O Molar mass NaCl 58 44g Na O 61 98g 10 2 If 53 grams of magnesium oxide reacts with an excess amount of sodium chlorido

2 NaCl Na O MgCl 1 If 24 grams of sodium chloride reacts with an excess amount of magnesium oxide how many grams of sodium oxide will be produced MgO Molar mass NaCl 58 44g Na O 61 98g 2 If 53 grams of magnesium oxide reacts with an excess amount of sodium chloride how many

Which of these groups of elements would be expected to have similar chemical properties OF Cl Br OC Ge Pb OP S Ar OPL Au Hg

Mg3N 3 K O 3 MgO 2 K N 3 If 14 moles of potassium oxide reacts with an excess amount of magnesium nitride how many grams of potassium nitride will be made Molar mass K N 131 30g 4 How many grams of magnesium nitride is needed to react with an excess amount of potassium oxide to produce 11 6 grams of magnesium oxide

21 An alternate way to state Avogadro s law is All other things being equal the number of molecules in a gas directly proportional to the volume of the gas a What is the meaning of the term directly proportional b What are the other things that must be equal

Use the following to answer question 9 2 KCIO3 2 KCl 30 9 If 80 0 grams of O was produced how many moles of KCIO3 decomposed Molar mass KCIO3 122 55g O 32 00g

Use the following to answer question 10 CaCO3 s 2HCl aq CaCl s CO g H O l 10 If a chemist uses 40 gram of HCI how many grams of calcium chloride can be produced Molar mass HCI 36 46g CaCl 110 98g

8 Sometimes leaving a bicycle in the sun on a hot day will cause a blowout Why

Station 3 Local water testing and treatment Common Connecticut Water Treatments

Global Wastewater Treatment US Wastewater Treatment Wastewater Treatment Comparisons of Global US and CT CT Wastewater Treatment

2 Why is it necessary to use a nonvolatile liquid in a barometer or manometer