General Questions and Answers

An ion from a given element has 83 protons and 80 electrons. What is the charge on the ion? What is the name of the element? What is the symbol for the ion?

Calculate the number of milliliters of 0.427 M KOH required to precipitate all of the Al3+ ions in 150 mL of 0.490 M AlI3 solution as Al(OH)3. The equation for the reaction is: All3(aq) + 3KOH(aq) →→Al(OH)3(s) + 3KI(aq) mL KOH

Conservation of Mass:Question 3 A piece of coal weighing 10g is burned, producing smoke and ash. The remaining ash weighs 2g. What happened to the remaining mass? Select one: The mass was converted into chemical compounds in the smoke. The mass was destroyed by the chemical reaction. The mass was consolidated into the ash. The mass was converted into energy.

Magnesium metal is very malleable, and is able to be pounded and stretched into long, thin, narrow "ribbons" that are often used in the introductory chemistry lab as a source of the metal. If a strip of magnesium ribbon is ignited in a Bunsen burner flame, the magnesium burns brightly and produces a quantity of white magnesium oxide powder. From the information given above, indicate one chemical property of magnesium metal. Magnesium "ribbons" are often used in the introductory chemistry lab as a source of the metal. Magnesium is malleable. Magnesium is able to be pounded and stretched into long, thin, narrow "ribbons". Magnesium burns in air.

Reactions 2:Question 2 A 1.0-gram sample of solid iodine is placed in a tube and the tube is sealed after all of the air is removed. The tube and the solid iodine together weigh 27.0 grams. Iodine solid The tube is then heated until all of the iodine evaporates, filling the tube with iodine gas. After heating, the total weight will be: Select one: less than 26.0 grams. 26.0 grams. more than 28.0 grams. 27.0 grams. 28.0 grams.

4. Draw condensed, complete and expanded structural diagrams for the following alkenes: a) 2,5-dimethyl-2-hexene b) propene c) methylpropene d) 5-ethyl-4-propyl-3-octene Alkynes 5. Name the following compounds:

The fundamental SI unit of length is the meter. However, we often deal with larger or smaller lengths or distances for which multiples or fractions of the fundamental unit are more useful. For each of the following distances, choose the fraction or multiple of the meter which might be the most appropriate measurement. a. the distance between Chicago and St. Louis: b. the size of your bathroom: c. the dimensions of a DVD player:

Choose the correct answer. A flashback is a scene that occurs during the falling action of a story a scene set later in time than the rest of the action in a story a scene that occurs at the climax of action in a story a scene set in an earlier time than the rest of the action in a story

Which scenario will result in the fastest reaction between 5 grams of zinc and excess aqueous hydrochloric acid? Choose the correct answer. Use a 5-gram zinc cylinder. Carry out the reaction in an ice bath. Use 5 grams of zinc crushed into a powder. Decrease the concentration of hydrochloric acid.

Calculate the number of atoms in 54.1 amu of boron. 3.01x1024 2 5 6.02×1023 8.31*10-24

After 25.0 mL of 6.00 M HCI is diluted to 150.0 mL, 10.0 mL of this solution is then diluted a second time to 150.0 mL. Calculate the molarity after the second dilution. 1.20 M 2.67×10-² M 2.40 M 1.00 M 6.67×10-2 M

The 38th parallel is: a. an attack North Korea launched against South Korea. b. an imaginary line that divided Korea at 38 degrees north latitude. c. the location of the Soviet Union. d. the name of a mission carried out by Stalin.

We can directly measure the temperature of a cup of coffee, but we cannot directly measure its enthalpy. Which statement explains why enthalpy cannot be measured directly? Choose the correct answer. Enthalpy is a measure of heat that is lost, and this heat cannot be measured during a reaction while particles are moving. Temperature has an absolute zero, but enthalpy is a measure of energy transferred as heat, and because particles always have energy, enthalpy cannot be zero, so we can only measure the change in enthalpy. Temperature is measured by its effect on an external object with a thermometer, while enthalpy never O affects substances outside the system, so there is no way to directly measure the energy with a tool such as a thermometer. Temperature measures the total kinetic energy of the particles in the coffee, but enthalpy measures the average kinetic energy, which cannot be found directly and must be calculated.

True or False: The Radium Girls who suffered Radium sickness decayed to death. Once buried the traces of radium found in their bodies when alive could no longer be found in their bones when buried. * True False

Which of the following is not a use of a resistor in a circuit? to allow the circuit to give off heat energy to allow the circuit to give off light energy to reduce the amount of current flow in the circuit to break when the current gets too high to prevent damage to the other components in the circuit

In the VSEPR model, the geometry of the regions defined by the electron pairs in the valence shell of an atom is called the electron-pair geometry. A. The electron-pair geometry around the Catom in CH4 is ___ There are ___ lone pair(s) around the central atom, so the geometry of the CH, molecule is predicted to be____ B. The electron-pair geometry around the P atom in PCI,?___ There are ___ lone pair(s) around the central atom, so the geometry of the PCL, molecule is predicted to be __

The element gallium has two stable isotopes, gallium-69 with a mass of 68.93 u and gallium-71 with a mass of 70.92 u. From the atomic mass of Ga, 69.723 u, one can conclude that: most gallium atoms have a mass of 69.723 u gallium-69 has the highest percent natural abundance both isotopes have the same percent natural abundance gallium-71 has the highest percent natural abundance

Which of the following is NOT an example of heat transfer by convection? Transfer of heat to cooler parts of the room from a radiator Cool breeze that blows from the water toward the beach during the day Heat you feel when standing close to a campfire Air moving from the Earth's equator toward the north pole

Solve: Which of the examples below is a description of an indefinite pitch? Clashing cymbals Striking a xylophone key Plucking a guitar string to let it vibrate Holding down a white key on the piano

If you decrease the temperature, what happens to the dissolving rate of NaCl in water? The dissolving rate increases because more collisions occur between solute and solvent. The dissolving rate decreases because fewer collisions occur between solute and solvent. The dissolving rate decreases because more collisions occur between solute and solvent. No collisions occur between solute and solvent, so the rate goes to zero.

A scientist obtains the number 0.045006700 on a calculator. If this number actually has four (4) significant figures, how should it be written? 0.4567 0.04500 0.04501 0.0450 0.4501

Chlorine, element number 17, is located in the third row and the next-to-the-last group of the periodic table. How many electron shells would be completely filled by a neutral atom of chlorine? How many electrons would be left over? 1 shell filled, 7 electrons left over 1 shell filled, 1 electron left over 2 shells filled, 7 electrons left over 2 shells filled, 1 electron left over

The principle of conservation of atoms is satisfied in a chemical equation when: the sum of the coefficients on the reactant side is the same as the sum of the coefficients on the product side. each atom on the product side has the same subscript that it had on the reactant side. the reactant side has the same number of each type of atom as the product side. all of the atoms involved in the equation have an oxidation number of 1*.

What formula gives the lowest whole-number ratio of moles of atoms in a mole of molecules? Molecular formula Constitutional formula Empirical formula Simplest formula Structural formula

Answer the following questions about the chemical reaction for the combustion of methane gas: CH4 +0₂→ Identify the reactants. CH4 and O₂ CH4 and CO₂ O₂ and H₂O CO₂ and H₂O

A substance made of two or more elements that cannot be separated by physical means is called a: multi-element. compound. homogeneous mixture. heterogeneous mixture.

Solution A has a pH of 6. Solution B has a pH of 8. What is true about these solutions? Solution A is basic, and solution B is acidic. Solution A has 10 times as many H* ions as Solution B. You could mix equal amounts of these solutions and obtain a neutral solution. None of the above is true.

Which two states refused to ratify the constitution until Congress agreed to add a Bill of Rights, and therefore missed a vote to elect George Washington as the first president of the United States? Georgia and Virginia Georgia and Rhode Island Georgia and North Carolina North Carolina and Rhode Island

What was the name of the proposal which sought a compromise between the Virginia Plan,and the New Jersey Plan? The Massachusetts Compromise The Pennsylvania Compromise The New England Compromise The Connecticut Compromise

After Zoe washes her hands, she needs to put on her personal protective equipment. She is going into an area requiring Transmission-Based Precautions, so she will wear a gown, a mask, and goggles in addition to her gloves. Read the steps she takes and write down anything she does incorrectly. First Zoe puts on her gown. She holds it out in front of her and shakes it open. She slips her arms into the sleeves and then ties the neck ties in a secure knot so that it will not come untied while she is working. She reaches behind her and, making sure all of her clothing is covered, ties the back ties. S

Ellen wants to raise the temperature of the water in a small child's wading pool. Which of the following would be the best way to do this, and why? Use a cup of slightly warm water, because it contains a large amount of thermal energy. Add water of any temperature, because any additional water will raise the temperature. Use a cup of boiling water, because its molecules are moving fast. Use a large bucket of hot water, because it contains a large amount of thermal energy.

Which of the following statements are TRUE for the process of dissolving NaCl in water? NaCl remains bonded together. Na and Cl become free ions. The attractive forces between water and NaCl are weaker than the forces holding NaCl together. All of the above

Question 83 (1 point) In which of the following situations does water undergo a change in physical properties? The bathroom fills with steam when you take a hot shower. The neighbor's pond freezes over in winter. Water is broken down to yield H₂ and 0₂. (a) and (b) only.

List the phases of water in order, from the phase with the slowest molecular movement to the phase with the fastest molecular movement. Liquid-Solid-Gas Gas-Solid-Liquid Solid-Liquid-Gas Gas-Liquid-Solid

Question 88 (1 point) A chemical formula for a compound tells a lot of information about that compound. Which of the following is NOT true of a chemical formula The chemical formula allows you to calculate the formula mass of a compound. The chemical formula lets you know if polyatomic ions are present in the compound. The element with the negative oxidation number is usually listed first. The chemical symbols for each element in the compound are given. Review Answers Question 88 of 88 | Page 88 of Rack

What did James Madison and Alexander Hamilton propose was the best course of action at the Constitutional Convention concerning the Articles of Confederation? To revise the Articles of Confederation. To discontinue the Articles of Confederation and form a new government. To appeal to Britain for help in creating a new government. To keep the Articles of Confederation, as it was.

A group of science students take a class trip to a coastal area to learn more about heat energy and heat transfer concepts. Choose the primary type of heat transfer that occurs in the situations that follow. A student burned his finger on a hot charcoal grill. a Conduction b Convection c Radiation d No heat transfer took place.

When you put ice in a drink to cool it off, coldness is transferred from the ice to the warmer drink. the ice cracks and releases cold air molecules which cool off the drink. heat from the ice is lost to the warmer liquid around it. heat is transferred from the warmer drink to the cooler ice.

Children's vitamins are usually chewable. Why is it a good idea to make vitamins chewable? Children might get a stomach ache from a whole tablet. Chewing allows the vitamins to be absorbed through the bloodstream in the mouth. Chewing increases the surface area, which increases the dissolving rate of the tablet. Chewing activates the chemicals in vitamins to make them more powerful.

Question 84 (1 point) Heat can be defined as the: a amount of thermal energy an object contains. b flow of thermal energy from one object to another object. c average kinetic energy of the molecules of an object. d average temperature of a substance.

Hydroxide ions: are contributed to a solution by an acid. are represented as OH". usually increase the pH value when added to a solution. (b) and (c) only.

What were the Federalist Papers? The platform of the Federalists Party The speeches given in the Constitutional Convention that were the basis for the document A series of 85 articles or essays advocating ratification of the U.S. Constitution All of the Important early documents such as the Declaration of Independence and Constitution

Which of the following statements about suspensions is TRUE? a A suspension cannot be filtered. b A suspension contains particles smaller than those of a solution. c A suspension is a true solution. d The large particles in a suspension eventually settle to the bottom of the container.

Question 57 (1 point) Which of the following statements about colloids is FALSE? a A colloid contains particles smaller than those in a suspension but larger than those in a solution. b A mixture of sand and water is an example of a colloid. c A colloid is not a true solution. d A colloid does not settle out, because the particles are constantly tossed about by the movement of the liquid particles.

Question 3 (1 point) If you hold a paper cup containing hot chocolate in your hand, thermal energy: does not flow. flows from the hot chocolate to your hand. flows from your hand to the hot chocolate. flows from the air to the hot chocolate.

Based on the sign of the standard cell potential, Ecell, classify these reactions as spontaneous or nonspontaneous as written. Assume standard conditions. Refer to the list of standard reduction potentials. Spontaneous as written Nonspontaneous as written

A sample of gas has a volume of 2.0 liters at a pressure of 1.0 atmosphere. When the volume increases to 4.0 liters at constant temperature, what will be the resulting pressure of the sample, to the nearest tenth of an atm?

Which of these details best communicates the story's theme? Ted is very upset and disappointed he didn't make the team. Ted is very happy that he didn't make the team, because he hates football. Ted's dad surprises him by being kind and understanding. Ted and his dad decide to toss a football around in the yard.

What is a phrase in music? Shorter parts of a melody with similar pitch and rhythm The cadence at the end of the melody The tempo Indicating the speed at which the music should be played The harmony that accompanies the melody

What was one of the consequences of the weaknesses in the Articles of Confederation? The States built strong economies. The States could declare war. The States worked very hard at cooperation and unity. The States bickered constantly among themselves,