General Questions and Answers

20 0 hat will be the final temperature of a sample of methane if 1 5 L at 98 5 kPa and 25 C is given a essure of 108 5 kPa and a volume of 1 3 L 284 48 K

Using the below chemical equation what mass in grams of magnesium oxide is produced when 0 4693 moles of oxygen gas reacts completely The molar mass of oxygen gas is 31 998 grams per mole and the molar mass of magnesium is 24 305 grams per mole Make sure to include the correct unit symbol with the answer choice 2Mg O 2MgO

A mouthwash is 44 8 ethanol by mass If each bottle contains 0 574 pints of mouthwash with a density of 0 889 grams per milliliter how many kilograms of ethanol are in 188 bottles of the mouthwash Please include the correct unit symbol with the answer Note 1 quart 946 milliliters 1 06 quarts 1 liter 1 pint 473 milliliters and 1 quart 2 pints O a 200 3 kg O b 20 3 kg O c 203 2 kg O d 32 1 kg O e 23 3 kg

In a sample of Chlorine there are two naturally occurring isotopes Isotope one is 78 42 of 35Cl with atomic mass of 34 97 amu and isotope two is 5 85 of 37Cl with atomic mass of 36 97 amu What is the atomic mass of chlorine O a 29 59 amu O b 22 19 amu O c 39 09 amu O d 49 29 amu O e 38 59 amu

Find Volume of H2O2 solution density 1 13 g ml

Using the below equation What mass in grams of oxygen gas is needed to react with 36 6034 moles of magnesium The molar mass of oxygen gas is 31 9988 grams per mole and the molar mass of magnesium is 24 3050 grams per mole Make sure to include the correct unit symbol with the answer choice 2Mg O 2MgO

What ratio is typical for a nonpolar molecules a Less than 3 carbons to 1 oxygen b Greater than 3 carbons to 1 hydrogen c Greater than 3 carbons to 1 oxygen d Less than 3 carbons to 2 oxygens

Enter your answer in the box provided A 144 0 nanogram ng sample of sodium 24 was stored in a lead lined cabinet for 2 5 d How m sodium 24 remained The half life of sodium 24 is 15 hours

3 attempts left Write the nuclear symbol for uranium 235 Click in the answer box to activate the palette

Select the single best answer Would you predict silicon 28 to be stable yes O no

Why does carbon dioxide not form a liquid or solid easily but form gases easily a The molecules don t have natural attractions due to that they have no polarity b They are asocial c They have no reason to like each other d They are too small

Why do solids form a They are dense b They have a lot of attractions to each other c They get pushed and pulled together by gravity d Things have an ability to form solids called solidibility

Select the single best answer Which type of nuclear process combines small nuclei to release energy fission O fusion O reduction oxidation

Be sure to answer all parts The isotope indium 111 is used in medical laboratories as a label for blood platelets To prepare indium 111 silver 108 is bombarded with an alpha particle forming an intermediate isotope of indium Use nuclear symbols to write a nuclear equation for the formation of this intermediate isota

A quick way to tell if a molecule is polar is a If there are no different attachments to the center atom b If there are different attachments to the center atom c If there are different attachments to any atom d If there are lone pairs on an atom

4 0 400 M nitric acid HNO3 a strong acid

The Cs 131 nuclide has a half life of 30 years After 120 years 3 7 g remain What is the original mass of the Cs 131 sample in grams

a Write an equation to describe the proton transfer that occurs when this base is added to water HSO4 HSO4 H O b Write an equation to describe the proton transfer that occurs when each of these bases is added to water CH3NH2 CH3NH2 H2O C Write an equation to describe the proton transfer that occurs when each of these bases is added to water F F H O H PO4 d Write an equation to describe the proton transfer that occurs when each of these bases is added to water

Why does water form solid and liquid so easily a The water molecules like each other b They have electrostatic attractions because of their polarity thus stick togeth c They are dense d Fach water molecule has a magnetic attraction with other water molecule

How can a reaction overcome its reaction inertia a Add a specific amount of heat energy to overcome the activation energy b Remove heat to overcome the activation energy c Add Temperature to overcome the activation energy d Remove atoms to overcome the activation energy

a Inability to move some feature like mass temperature etc b Ability to move some feature like mass temperature etc c Sleepiness d Energy

If a molecule has two connections and two lone pairs the 3D shape is a Tetrahedral b Bent c Triangular pyramid d Linear

Given the following densities at 25 C magnesium 1 700 g cm3 graphite 1 800 g cm3 iron 7 900 g cm A block of iron has a mass of 550 00g What is the mass of a block of graphite that has the same volume as the block of iron O 110 g O 2 120 g 7110 g 142 4 113 9 g

What is polarity a The ability of electrons to be shared and distributed b The distribution of electrical charge on a molecule c The magnetic distribution on a molecule polecule

Of the two Lewis electron dot structure representations which is the correct one for diphosphorous tetrachloride A CI CI P P B i CI P P CI CI

What is the chemistry term that measures reaction inertia a Heat b Activation Energy c Enthalpy

All chemical reactions have a An energy of action b Trouble getting started c Start without any trouble d Need of a match

What is similar about all combustion reactions a They release heat b They absorb heat c They are easily balanced d Nothing

How many protons and neutrons are contained in each of the three isotopes of hydrogen Be sure to answer all parts 1 a H 1 b H 1 c H Number of protons Number of protons Number of protons 1 1 1 Number of neutrons Number of neutrons Number of neutrons

What forces cause water molecules to stick together a London dipersion forces b Magnetic forces c Electroconnectivity d Electrostatic attractions

As of now what do chemical equations show us a The atoms and molecules involved in the reaction b The amount of energy used or absorbed in the reaction c The number of coefficients that belong to each mixture d Everything we need to know

What kind of system are we a Closed b Isolated c Open d Whole

Reaction Predict relative spontaneity without doing calculations Type C5H12 g 802 g 5CO2 g 6H O g heat Na s H O 1 NaOH aq H g heat 2NO2 g heat 2NO g O2 g C2H4 g H2 g C2H6 g heat 6CO2 g 6H2O g light 602 g C6H12O6 s 2KCIO3 s heat 2KCI s 302 g N2 g 3H2 g 2NH3 g heat H g ZnCl aq heat 2HCl aq Zn s Enthalpy Entropy AH AS Types of reactions review S D SR DR C A B acid base TD spontaneity is temperature dependent because of opposite signs Spont AG Yes No or Maybe TD

What are the views for 3D Three dimensions a Side front top b Side front c Front side Sida down

U pts Extra credit question 2 points it shows as 0 points in this exam so that Canvas will not count it in the denominator I will manually add up to 2 points as appropriate when grading so that it will show as extra credit Numerous researchers around the world worked to develop vaccines to SARS CoV 2 the novel coronavirus causing the current pandemic that is impacting all of our lives Although there are different approaches taken the basic idea is for the vaccine to get the adaptive immune system to produce antibodies note there is more to the story but we won t worry about that for now Imagine an individual is given the vaccine responds well and produces antibodies How would these antibodies protect that individual from getting sick from the novel coronavirus I e what is the core simple function or property of antibodies that allows them to be protective

What happens when gasoline combusts in your car engine besides emitting carbon dioxide and water a Energy is absorbed to get car moving b Energy is released to get car moving c Gasoline turns into heat d Oxygen and gasoline form methane

What is temperature inertia a The inability of a material to change its temperature when heated b The ability of a material to change its temperature when heated c The inability of a material to move d The inability of a material to get heated

Can we measure Heat directly a No b Yes c Depends d With a thermometer

Classify each of the following substances BC13 Fe3 HS F CH4 Clear All Lewis Acid Lewis Base Can act as either a Lewis Acid or Lewis Base Neither a Lewis Acid or Lewis Base

In an endothermic reaction energy graph the reaction arrow goes a Up b Down c Depends d Left

What does exothermic mea a Heat is absorbed in the reaction b Heat is added to the reaction c Heat is released in the reaction d Thermometer goes up

For carbon based combustion reactions there is a recommended order a rule in which the atoms should be balanced initially Put the atoms in the correct order for balancing according to this rule should be balanced first should be balanced second should be balanced last Choose Choose sodium nitrogen carbon calcium helium oxygen

When reaction absorbs heat where do we put the word heat in the chemical equation a On the reactant side b Over the arrow c We leave it out d On the product side

Determine the volume L of nitrogen monoxide gas that is created at STP when 32 2 g of solid copper reacts with excess nitric acid 3Cu s 8HNO3 aq Answer Select Select 3Cu NO3 aq 4H O l 2NO g Select select a value unit and substance

The electron distribution among the atomic orbitals for an oxygen atom in its lowest energy state the ground state is 1s 2s 2p A 111 B NNNN C NN1 D N N N11 E NN NNT OA OB OC OD

1970 Question 14 Calculate the molar concentration of the following solution DATKIPRON FIOR 1924 EUR 10000 Misturlan FRENCH SPREJE BORAC HOME 146 8 mL of a solution containing 29 7 g potassium iodide in H O GENER STELLE

Predict the reactants of this chemical reaction That is fill in the left side of the chemical equation Be sure the equation you submit is balanced You can edit both sides of the equation to balance it if you need to Note you are writing the molecular and not the net ionic equation BaF aq H O 4 8 0 0

Calculate the mass weight 3 33 mol calcium chloride

4 Considering only the equilibrium Mo CO 1 3 5 C H Me 2 1 3 5 C H Me Mo CO 3 CO which method of preparation of 1 3 5 C H Me Mo CO 3 would give the higher yield a as performed i the experiment or b in a sealed bomb reactor Explain your choice

Use When the following molecular equation is balanced using the smallest possible integer coefficients the values of these coefficients are iron s iron III chloride chlorine g