1. chemistry

    Criticize the following statements. 1. In an ionic compound, the number of cations is always equal to the number of anions. [Is it ok to say 'not always'?] 2. The molecular formula for strontium bromide is SrBr(sub 2) [what's wrong wih this?] 3. The mass
  2. Physical Science

    10. The more compact a metal is, the less brittle it becomes. -True? I'm confused about this one because of what the textbook says: "the more compact the atoms become, the harder the metal becomes. While the compactness makes the metal hard, a fracture on
  3. Physical Science

    10. The more compact a metal is, the less brittle it becomes. -True? I'm confused about this one because of what the textbook says: "the more compact the atoms become, the harder the metal becomes. While the compactness makes the metal hard, a fracture on
  4. chemistry

    why is this statement false? "when an ionic compound dissolves in water an equal number of positive and negative ions is created."
  5. math,algebra

    can someone correct this for me: Translate the following statements into inequalities. Let x represent the number in each case. 2 times a number, increased by 28, is less than or equal to 6 times that number. My answer: 2x+28 <6x - the symbol that i'm
  6. Chemistry

    I need help with getting started: 1.The crystal structure of an ionic compound consists of alternating cations and anions lying next to each other in three dimensions. If the cation radius is 55.1% of the anion radius and the distance between the cation
  7. Chemistry

    I need help with getting started: 1.The crystal structure of an ionic compound consists of alternating cations and anions lying next to each other in three dimensions. If the cation radius is 55.1% of the anion radius and the distance between the cation
  8. chemistry

    Many ionic compounds have high melting points because a lot of energy is required to break the strong ionic bonds. So after breaking the ionic bonds, the ionic compound becomes a liquid. How do you explain why the ionic compound also has high boiling
  9. Chemistry

    Two rigid containers of equal volume hold hydrogen and argon gases respectively at the same temperature and pressure. Which of the following statements is(are) false ? A) The two containers hold an equal mass of gas. B) The two containers hold an equal
  10. chemistry

    When compared to compound B, compound A has lower melting and boiling points and vaporizes more readily. Is compound A an ionic compound or a molecular compound? A. Ionic B. Molecular I say B
  11. math correction

    Translate the following statements into inequalities. Let x represent the number in each case. 2 times a number, increased by 28, is less than or equal to 6 times that number.
  12. Computer Science

    After reviewing an algorithm that allowed a user to enter 3 different numerical values, if statements were used to find the smallest value. Smallest of five: The assignment is to determine which method (either nested conditions, sequential compound
  13. Math

    In number and it's our food value are equal if you subtract two from the number the new number and it's absolute value are not equal what do you know about the number what is a possible number that satisfies these conditions
  14. chemistry

    Which of the following describes the compound Mn(NO2)2? If the compound dissolved in water it would be a strong electrolyte. The compound is ionic. The compound would conduct electricity if molten. The compound is molecular. The compound would be expected
  15. chem

    how do you find the number of electrons in an ionic compound chart, if you haven't been given the charge? Would someone be able to please tell me? thanks
  16. Chemistry

    (a) The solubility of bismuth iodide (BiI3) in water is 4.891 x 10-3 M. Calculate the value of the solubility product. The dissolution products are Bi^3+ (aq) and I^- (aq). (b) Do you expect the solubility of (BiI3) in 0.1 M NaCL (aq) to be equal to,
  17. Math mrs sue

    Can you check these? 18% of 90 is what number? i got 16.2 what number is 41% of 800? i got: 1951.22 what number 5% of 522? i got : 10440 70% of 279 is what number? i got: 195.3 what number is 90% of 13? i got : 14.44 9% of 351 is what number? i got: 32 36%
  18. math percents

    Can you check these? 18% of 90 is what number? i got 16.2 what number is 41% of 800? i got: 1951.22 what number 5% of 522? i got : 10440 70% of 279 is what number? i got: 195.3 what number is 90% of 13? i got : 14.44 9% of 351 is what number? i got: 32 36%
  19. Science 11th grade

    In an ionic compound, what is the net ionic charge? and what compound does an -ide ending generally indicate?
  20. algebra 1

    a number and its absolute value are equal.if you substract 2 from the number, the new number and its absolute value are not equal. what do you know about the number? what is a possible number that satisfies these conditions? Can you help answer these 2
  21. Science

    Review the information. In Compound A, Element W has an electronegativity of 2.8, and Element X has an electronegativity of 2.5. In Compound B, Element Y has an electronegativity of 2.0, and Element Z has an electronegativity of 3.8. Which statement
  22. Chemistry

    Complete the table by filling in the formula for the ionic compound formed by each pair of cations and anions, as shown for the first pair. Ion K+ NH+4 Mg2+ Fe3+ Cl- OH- CO3 2- PO3- 4 Complete the fourth row of the table.
  23. Physics

    In a step-up transformer, which of the following statements is correct? Number of turns in primary is equal to number of turns in the secondary. Number of turns in primary is more than the number of turns in the secondary. Number of turns in primary is
  24. IB Chemistry

    Which statements are correct for an endothermic reaction? I. The system absorbs heat. II. The enthalpy change is positive. III. The bond enthalpy total for the reactants is greater than for the products. A. I and II only B. I and III only C. II and III
  25. Chem

    Suppose that a stable element with atomic number 119, symbol Wr, has been discovered. (d) What would be the most likely charge of the Wr ion in stable ionic compounds? (e) Write a balanced equation that would represent the reaction of Wr with water. (f)
  26. math

    What is the lowest numberthat has a remainder of 1 when divided by 2 and a remainder of 2 when devided by 3 and a remainder of 3 when divided by 4 and a remainder of 4 when divided by 5? The answer is 59. There is a general method for solving such problms,
  27. Statistics

    a roulette wheel has 40 slots evenly divided between red (even) and green (odd) slots totaling 38 and a "0" and a "00". what is the probability of the ball landing in an: A)even number < 10 B) other than an even or odd number C) odd number > 15 D)
  28. Chemistry

    Two flasks A and B of equal capacity of volume contain SO3 and Co gas respectively under similar conditions of temperature and pressure. Then, which of the following statement is true? (1) A has twice the number of moles as that B. (2) B has twice the
  29. chemistry

    Which of the following is generally defined as a substance composed of molecules in which two or more nonmetallic elements are joined? A. Binary compound B. Ionic compound C. Molecular compound D. Ternary compound I think A
  30. Math

    Half of a number added to a fifth of three less than the number is equal to two-thirds the number. What is the number? my answer: the number is 18
  31. math

    sum of 3 number is equal 39 , the second number is half of third number ,and the first number less than third number by 1,the result must be 6 degit ?
  32. chemistry

    What is usually indicated by an -ite or -ate ending in a chemical formula? A. The compound carries a net ionic charge of zero. B. The compound contains a polyatomic ion. C. The compound is an acid. D. The compound is molecular. I think A
  33. Science urgent

    1. Explain why the melting points of ionic compounds and molecular compounds differ? 2. A.) What laboratory procedure allows you to test a compound is ionic or molecular? b.) what results would you expect? 3. A.) What do we call the smallest particle of an
  34. science

    3) Some ionic compounds contain a mixture of different charged cations. For example, some titanium oxides contain a mixture of and ions. Consider a certain oxide of titanium that is 28.31% oxygen by mass and contains a mixture of and ions. Determine the
  35. chemistry

    1)RuO2 is molecular, but why is it insulator even though Ru is metal? 2)Why is TiO ionic? I thought only group 1 and 2 would make ionic compound 3)If the the compound has metal and metalloid like GaAs, is it always semiconductor
  36. Chemistry

    I am writing out ionic compounds. The compound given is Fe(subscript)2O(subscript)3. I noticed on the periodic table iron had a charge of 3+/2+. Which should I then write down in the cation column of my ionic compound chart? Thank you.
  37. chemistry

    How do I calculate the number of atoms in a compound (not an element)? I have the mass of the amount of substance, and the molar masses. How do I do this? Is this the same as calculating the number of molecules/ formula units? Also, I know the number of
  38. Chemistry

    An ionic compound dissolved in water, separated into its ions according to the following equation: MA2 (s)--> M^+2 (aq) + 2A^- (aq). If the ground state electron configuration of the two ions are similar to those of neon. Ne, and of Kr, the two elements
  39. Chemistry-Bonding

    Classify the following bonds as ionic, covalent, or neither (O, atomic number 8; F, atomic number 9; Na, atomic number 11; Cl, atomic number 17; U, atomic number 92). a.) O with F _________ b.) Ca with Cl __________ c.) Na with Na _________ d.) U with Cl
  40. Science--Help.

    Which of the following is NOT one of the eight most common elements in Earth’s continental crust? carbon silicon oxygen aluminum The most abundant element in Earth’s continental crust (by weight) is _____. 2. oxygen silicon calcium iron 3. The central
  41. Math

    John is thinking of a number in the hundred thousands the first digit is equal to the number of digits in the number. the number has twenty tens and twice as many thousands. the number of ones is an odd number that is less than five and greater than the
  42. Statistics

    Let Y be a random number between 0 and 1 generated by an idealized random number generator. Find the following probabilities: A. P (0 less than equal to Y less than equal to .6) =? B. P (.3 less than equal to Y less than equal to .5) =? C. P ( Y less than
  43. Math

    A number and its absolute value are equal. If you subtract 2 from the number, the new number and its absolute value are not equal. What do you know about this number? What is a possible number that satisfies these conditions?
  44. Math

    a number and its absolute value are equal. if you subtract 2 from the number, the new number and its absolute value are not equal. what do you know about the number? what is a possible number that satisfies these conditions?
  45. Math

    A number and its absolute value are equal. if you subtract 2 from the number, the new number and its absolute value are not equal.What do you do about the number?What is possible number that satisfies these conditions?
  46. chem- ion

    naming chemical compounds. I don't really get how you get the symbol from the word or the other way around for polyotomic ions so.. here are some examples that a website gave me: this is wut the site said to do:(Its confusing to me) The name of the
  47. Math

    The sum of three numbers equal 92. The second number is 8 more than the first number. The third number is 2 times the second number. What is the first number?
  48. General Chemistry

    The formula of a compound of lead (Pb) and sulfur (S) was determined using the method in this module. A sample of Pb was weighed into a crucible and covered with finely powdered S. The crucible was covered and heated to allow the Pb and S to react.
  49. Math

    ) Form a conjunction from the following two statements and determine if the conjunction is true or false. Explain. Two is an even number. Two is a prime number. A) Two is an even number or two is a prime number.; False B) Two is an even number and two is a
  50. Algebra

    You spin a spinner that has eight equal-sized sections numbered one to eight. Which event is least likely to occur? • The number is even. • The number is less than three. • The number is greater than three. • The number is a multiple of five.
  51. algebra

    Please help me find the domain for the following functions. If I understand this correctly I can use any number as long as the denominator does not equal zero 1) y = 7/(1 +x) can be any number except -1 2) y = -2/(6- x) can be any number except -6 3) y =
  52. math-calculus

    which of following statements is false 1. The absolute value of a real number is the principal square root of the square of the number. 2. The absolute value of a real number is the distance of the number from zero on a number line. 3. The absolute value
  53. GEN MATH

    Solve the ff. problems. Present a complete and systematic solution. 1.) A number added to twice its reciprocal is equal to 11/3. WHat is the number? 2.) The ratio of ten more than three times a number to the square of the same number is equal to 1. What is
  54. Chemistry

    10. Avogadro's number can be used to find the number of atoms in an element.- T 12. A photon is a quantum of light energy.- T 17. The atomic mass unit is determined by Oxygen-16.- F 18. The number of particles in a mole is a constant.- T 19. The number of
  55. math

    The difference of the digits of a two-digit number is 5. The number is equal to five less than the number of tens. Find the number.
  56. math

    Consider the given statements. 1. Every prime number is odd. 2. There are 8 prime numbers between 10 and 40. 3. There are 11 composite numbers between 0 and 20. 4. The number 4 is the smallest even composite number. Which two given statements are
  57. Math

    Which of the sentences below could represent 4 ÷ p = 2? A. Four divided by two is equal to a number. B. Four divided by a number is equal to two. C. A number divided by four is equal to two. D. Four times a number is equal to two.
  58. math help

    1. a number increased by 21 is 28. find the number 2. a number decreased by 12 is equal to 30. find the number. 3. 8 less than a number is 15. fid the number
  59. algebra

    1. a number increased by 21 is 28. find the number 2. a number decreased by 12 is equal to 30. find the number. 3. 8 less than a number is 15. fid the number
  60. Science to: DrBob222

    1. Explain why the melting points of ionic compounds and molecular compounds differ? 2. A.) What laboratory procedure allows you to test a compound is ionic or molecular? b.) what results would you expect? 3. A.) What do we call the smallest particle of an
  61. ap stats

    Continuous Random Variable, I Let X be a random number between 0 and 1 produced by the idealized uniform random number generator described. Find the following probabilities: a.P(0less than or equal to X less than or equal to 0.4) b.P(0.4 less than or equal
  62. stats

    Continuous Random Variable, I Let X be a random number between 0 and 1 produced by the idealized uniform random number generator described. Find the following probabilities: a.P(0less than or equal to X less than or equal to 0.4) b.P(0.4 less than or equal
  63. Chemistry

    Answer these questions about NaCl also known as table salt: 1. What is the name of the compound? 2.Are there any other names that it is known by? If yes, then please list them. 3.What is the chemical formula of the compound? Is it an ionic or covalent
  64. Chemistry

    1. Regarding solutions and solids, which statement is true? A. If the solvent is water, the crystal lattice energy of a solid is absorbed. B. Hydration energy is related to the attractions between solute particles. (My Answer) C. If the solvent is water,
  65. Science

    A compound is made up of two elementsA and B,has A=70%,B=30%.The relative number of moles of Aand B in the compound are 1.25 and 1.88 respectivily.If the molecular mass of the compound is 160g.Find the molecular formula of the compound?
  66. Math

    Directions : write the equation or an inequality 1.The difference of a number C and 17 is more than 33 ? 2.The product of 3 and number X is at most 21 ? 3.The sum of 14 and twice a number Y is equal to 78 ? 4.The difference of 22 and the quotient of a
  67. Math

    Carl's hands trembled as he stood in front of the safe and unfolded the crumpled piece of paper holding the combination that would open the safe. "Rats!' he moaned. The combination was written in the form of a riddle. The last number was described in the
  68. algebra

    for number 2, i thought it was y = 5x because if you multiply 5 by any of the numbers in the x colum, it equal y Also for number 3, could you further explan, are you saying the answer is zero? As for number one, is the answer 1/x-3 where x does not equal
  69. Discrete math

    TRUE OR FALSE ? Justify your answer. a. There exist real numbers a and b such (a+b)^2 = a^2 + b^2. b. For any real number x, there exists a unique number -x such that x + (-x) = 0. c. Any integer n is either odd or even. d. Any real number x can be written
  70. Math

    Hi everyone, my name is Emerson. I was wondering if anybody could help me on a test. I'm stuck on some, but I think I know some others. Thank you! 1. Translate the phrase "nine more than two times a number" in to an algebraic expression. A. 9x + 2 B. 2x +
  71. Chemistry

    Of the compounds below,_____ has the smallest ionic separation and why? A.RbF B.K2S C.SrBr2 D.KF E.RbCl --> How does one determine if a compound has a high or low ionic separation, and what is ionic separation?
  72. Chemistry

    Of the compounds below,_____ has the smallest ionic separation and why? A.RbF B.K2S C.SrBr2 D.KF E.RbCl --> How does one determine if a compound has a high or low ionic separation, and what is ionic separation?
  73. can any smart person in c++ can answer this?

    A “magic” number is an integer in which the number is equal to the sum of the cubes of its digits. Write a program to determine whether a three digit number entered by the user is a magic number.
  74. math trivia!

    Take any number ending in 5. (for example 35). Multpily the first part of the number (3) by the next higher number (4) and then add 25 to the end. (to give you 1225) That's what 35 to the power of two is equal to. This works for any number that ends in
  75. Math

    Write the equation and solve the following problems 1. Seven more then three times a number is 22. What is the number? 2. One half a number diminished by six is 14. What is the number? 3. The sum of two consecutive numbers is 131. What are the numbers. 4.
  76. Algebra 2

    The sum of 3 numbers is 42 The sum of the first number and the third number +2 = the second number The third number multiplied by 2 is equal to the sum of the first and third number Can someone help me solve this? Questions like these make my brain hurt, I
  77. math

    write the verbal sentence as an equation.then solve the equation Three less than 11 times a number is equal to 9 plus 5 times the number. twelve less than -9 times a number is equal to 8 minus 4 times the number
  78. math

    I am a two digits number.my first number is equal to 7 and than 13. The second digit is number between 1 and 9 .what is the number
  79. Chemistry

    Colligative Properties The freezing point of distilled water was determined by recording a thermogram: -0.176. The freezing point of a 0.200 m (molality) solution containing an unknown, ionic compound was determined by recording a second thermogram. a.
  80. algebra

    Twice the first number is eleven more than the sum of the other two numbers. The sum of twice the first number and three times the third number is one more than the second number. The second number is equal to the sum of the first number and the third
  81. Chemistry

    Ok I think I figured this out but im not sure if its right please help. Thanks(= Determine the oxidation number for nitrogen in each of the following a)NH3 = -3 b)NO2-1 = 2 c)N2= 2 d)NO2Cl= 2 e)N2H4= 2 The first one is right. All must add to zero for a
  82. chemistry

    1 _____is defined as one-half of the distance between the nuclei of two adjacent metal atoms in the close packed crystal lattice ionic radius metallic radius covalent radius atomic radius 2 Except for rubidium and caesium, all common cations are smaller
  83. Algebriac Expressions

    2 less than 7 times a number = 2) Sarah's age decreased by 2 = 3) One third as many books = 4) Earns $13 per hour = 5) 4 years younger than Marcus 6) 2 times a number, decreased by 4 7) 9 less than the product of 15 and a number 8) The quotient of a number
  84. Intermediate Algebra

    Translate phrases from words to symbols for the following statements: The sum of twenty and five is greater than or equal to four times three and a number.
  85. mathematics

    Key: logx= log base x 1. Prove that: (logx64 +logx4 -logx8)/(logx1024) =1/2 2.factorize by grouping r^2s^2+3t^2+r^2t^2+3s^2 3.factorize the following expression 49p^2-1/25 4.simplify i.(ax+bx+ay+by)/(cx+cy+dx+dy) ii.(3/4+1/2) / (1/3+1/2) 5.two thirds of a
  86. algebra

    the number of cats that are homeless can be modeled by the equation N= 2.1t squared - 82t + 95 where N is the number of cats that are homeless and t=0 set as the current year.Use the quadratic model to find the number of years from now until the number of
  87. MATH

    the square of a number is equal to the sum of 21 and 4 times the number. find the number WHATS THE EQUATION (AM CONFUSED ?)
  88. MATHS

    The+sum+of+two+numbers+is+30+six+less+than+twice+the+smaller+number+is+equal+to+the+number+x+find+the+larger+number Please give me the answer
  89. chemistry

    In order to determine the number of atoms in a compound, you must know the number of atoms in a representative particle of the compound. True False i think false
  90. math problem

    a number is a common multiple of 7 and 11. It is the least such number with a sum of digits equal to 11. find the number
  91. algebra

    If four times a certain number increased by 6 is equal to 94, what is the number? If x represents the number, then which of the following equations could be used to solve the problem? 4x + 6 = 94 or 4(x + 6) = 94
  92. algebra

    a certain positive number is equal to nine-tenths of the sum of the number and its reciprocal. find the number
  93. math

    i am a number between 20 and 30. put me into 6 equal groups.ther is a even number in each group and one is left over. what number am i?
  94. 2nd grade

    i am a number between 20 and 30, when you put me into 6 equal groups, there is an even number in each group and 1 is left over, what number am I.
  95. algebra homework help

    Let y be the unknown number. The difference between a number and 11 is equal to the number times 8. Is this correct y-11=y(8)
  96. Math

    I am a number between 20 and 30. When you put me into 7 equal groups, there is an odd number in each group and 2 are left over. What number am I
  97. math

    four times the difference of a number decresed by 3 is equal to 8 more than the product of 3 and the number.find the number.
  98. chemistry

    When 1.24g of an organic compound with the formula CxHyOz is burned in excess oxygen, 1.76g of carbon dioxide and 1.08g of water vapor are obtained. What is the empirical formula of the compound? Determine the moles of CO2 in 1.76grams, that will give you
  99. Math

    How would you solve for these word problems in one variable inequality form? 1. A number, n, decreased by 6 is less than or equal to 4. 2.One half of a number, increased by 9 is less than 33. 3.Six less than or equal to the sum of 4 and -2x.
  100. help 1

    This number represents the equal number of parts that equal a whole in a fraction. A. Numerator B. Denominator C. Variable D. Expression i got b