General Questions and Answers

Exit Find the pH of a 0 00476M hydrochloric acid solution HCl aq H C1 aa a Is the solution acide or basie b what is the pOH What is the cresentation of OH

Given the equation A g B g 2AB g A 4 0 M B 2 0 M and AB 4 0 M at equilibrium What is the value of the equilibrium constant K O 4 0 2 0 O 3 0 O 1 0

d What is the molar mass of a particular compound if 0 070 mol weighs 6 02 g g mol

c What is the mass in grams of 5 78 x 1023 molecules of aspirin CgH8O4

b What is the mass in micro grams of the following 1 7 3 moles of KCI 2 20 3 micromol Ph

4 C 5 6 What is the molarity of a NaOH solution if 0 75 liters of the solution contains 2 0 moles of NaOH

10 True or False More fast twitch muscles are in your back to help you maintain your posture all day A True B False

4 What type of bones are used for muscle attachment A Short bones and hard bones B Long bones and flat bones C Short bones and long bones Flat bones and hard bones D

What is ASsurr When 20kJ of heat is added to the system at 100K 200 J K 0 2 J K 0 2 J K 200 J K

Which of the following is a heat of formation reaction O C graphite 1 2O gas CO gas O Cigraphite O gas CO liquid O 2C graphite O gas 2CO gas O C diamond 1 2O gas CO gas

3 Atmospheric pressure depends on the altitude or height of your location How should the air pressure change if you were in Denver Colorado which is 1 5 kilometers 1 mile above sea level

4 What does the skeletal muscle attach to A The heart B The blood vessels C The tendons and bones

A scientist claims that Fabric A is better able to resist fire than Fabric E Which option describes an experiment that will produce evidence that support or refute her claim O A Make detailed measurements of each type of fabric to deter the thickness of their fibers OB Measure how long it takes for a specific amount of Fabric A burn up completely OC Hold each type of fabric over a candle flame and time how la takes for the fabric to start to burn OD Combine Fabric A and Fabric B and measure the temperature which they start to burn

Choose the correct Lewis structure for N H A O B O C O D O E O H H N N H N N H H N N H H N N H Select one answe 6 points

Calculate the volume in mL of 0 100 M CaCl needed to produce 1 00 g of CaCO3 8 There is an excess of Na2CO3 Na CO3 aq CaCl aq 2 NaCl aq CaCO3 s Molar mass of calcium carbonate 100 09 g mol Volume of calcium chloride mL

Determine the number of sigma and pi bonds are in a molecule of N H number of o bonds number of bonds Type numbers in the boxes ab Part 1 5 points aby Part 2 5 points 10 points

Make an inference about the word in bold in this example My cousin is a maverick jazz musician He does not want to be labeled or belong to a school of ja O Normal O Rebel O Innovative

Which of these properties of water is responsible for capillary action in plants O High thermal conductivity O Highest density is at 4 C O High specific heat capacity O Surface tension

Which of the following statements is true O Exothermic reactions have a positive sign O Work done on the system is positive O Entropy is positive for a system that become more ordered Spontaneous reactions have a positive free energy

What is the pH of a solution if its proton concentration H is 765 mM millimolar Provide the answer to one decimal place Note You may need to round the numbers to get the required answer

Problem G The v v of ethanol in Everclear is 90 Ethanol has a density of 0 789 g mL and a chemical formula of C H O a Calculate the m v of ethanol for Everclear

If we have 16 9 grams of water how many moles of water will we have 16 9

The maximum number of fatty acid chains in a triglyceride molecul 01 02 03 04

Which of the following is the cor correctly Ca OH 2 balanced equation for the complete neutralization of H 3PO 4 by

9 Given a pOH 10 852 calculate the following a pH b H

A Moving to another question will save this response stion 2 What is the H 30 in a solution with OH 1 10 12 M O 1 x 10 12 M 4

The IUPAC names for carboxylic acids can be determined from their molecular structures QUESTION Write the IUPAC name for Correct TUPAC name COOH

The first resonance structure of the thioformate ion HCOS is shown H 1 0 O 0 O Determine the correct second resonance structure of thioformate ion oi 1 s c S C 0 H 0 O H O 0 S 1 0 C S H S H

2 The eccentricity of the earth s 5 points orbit changes over long periods of time Our planet is sometimes 20 30 times closer to the sun However this does not seem to match with the warming trend in our climate Why not Because right now we are not 20 30 O times closer to the sun so it shouldn t be so warm Because eccentricity does not O contribute to changes in the earth s climate O Because the climate does not change over long periods of time

2 points Using the given electronegativity values identify the most polar bond that can be formed if one of the listed atoms is bonded to another one of th listed atoms in any combination Element H C NPS H N H C H S H H H P Electronegativity 2 1 2 5 3 1 2 2 2 4

If you left equal masses of iron and water out in the sun on a hot day which one would be hotter after 15 minutes Why 5 If the same amount of heat is added to 25 0 g sample of each of the metals in the chart below which metal will experience the smallest temperature change Metal Calcium Iron Silver Gold Specific Heat J g C 0 647 0 449 0 235 0 129

Write the full electron configuration for a Ca ion electron configuration Write the full electron configuration for an N ion electron configuration

A certain shade of blue has a frequency of 7 25 x 10 4 Hz What is the energy of exactly one photon of this light Planck s constant is h 6 626 x 10 34 J S E

6 Review How much water mL would be produced by melting 3500 m 3 of ice 1 Point 1 750 mL 7 000 mL 3 360 mL

What element does sulfur have the same number of bonds and lone pairs a Oxygen b Carbon c Fluorine d Nitrogen

Mrs Carrolowitz has the following prescription for pain Tylenol 500 mg PO every 4 hours for pain What is the maximum dose in milligrams that the patient can receive in a 24 hour period of time in mg i Report answers with appropriate decimal places for professionals to dispense

OH CH CHCH3 select Identify the functional groups in each compound Some compounds contain more than one functional group 1 select 2 select 1 2 CH CH H NCH CH CH CH NH 1 select Cl 2 attempts left Check my work H Sol Guided

How does polarity cause oil to separate from water O Oil is nonpolar and water is polar so the polar water molecules are more attracted to each other than the oil Oil is polar and water is nonpolar so the polar oil molecules are more attracted to each other than the water O The dispersion force in the water molecule repel the nonpolar oil molecules so they will separate O Oil is more dense than the water so it will sink to the bottom Submit Question

What is the fourth step in determining the bonding structure a Counting the number valence electrons b Filling the holes c Drawing skeletal structure d Counting dots

If an organism has 40 chromosomes in its somatic cells how many chromosomes will be in its gametes Only type the number in the answer box below Do not type in any words or else it will n

11 2 points Based on the periodic trend arrange the following element in order of decreasing electronegativity Highest Electronegativity 1 2 the energy of the bond and the location of the electron pair in the bond 3 4 O F S Sh

What is the first step in determining the bonding structure a Counting the number valence electrons b Filling the holes c Replacing shared dots with dashes d Counting dots

Which of the following is a potential function of carbohydrates Select all that apply support plant structure O provide energy function as signal transmittor molecules store genetic information

3CaCl2 aq 2Na3 PO4 aq Ca3 PO4 2 s 6NaCl aq Suppose 163 9 g of Na3 PO4 in solution mixed with sufficient CaCl2 in solution yields 116 g of Ca3 PO4 2 s What is the percent yield of Ca3 PO4 2 s A 141 B 74 8 C 105 7 D 50 0

1 Solar irradiance means the amount of sun energy we het on earth Based on the graph below which statement is most accurate Total Solar Irradiance W m 2 Temperature vs Solar Activity 1363 1362 1361 1360 1880 Solar Irradiance O 1900 1920 Temperature 1940 11 year average Yearly Year 1960 T source GISTEMP 3 1 TSI source SATIRE T2 PMOD 1980 2000 5 points Temperature and solar irradiance O always move together in the same direction 2020 1 0C 0 8C climate nasa gov 0 6C 0 4C 0 2C 0 2C 0 0C 0 40 0 6C 0 8C 10C Something other than solar irradiance Omight be causing an increase in temperatures over the last 50 years Temperatures have been decreasing over the last 50 years Degrees Celsius C

19 2 points Which element below includes five electrons in its Lewis symbol 2408 Ni Na As Se

8 Iodine 131 which is used to treat thyroid cancer has a half life of 8 04 days How much time is required for 76 of the isotope to decay

6 Based on the best Lewis structure from formal charge considerations how many resonance structures if any can be drawn for the 4 3 2 1 no resonance 1 point Gand O which atom carries the partial negative charge

7 Review What is the Molarity M of 1500 grams of solute Calcium Chloride CaCl2 when added to 5000 mL of solution water 1 Point 01 M 01 M 3 94 M O 2 7 M

How many bonding arrangements does carbon have a 1 b 4 C 2 d 3