Description : One atom of an element x weigh `6.643 xx 10^(-23)` g. Number of moles of atom in 20 kg is :-
Last Answer : One atom of an element x weigh `6.643 xx 10^(-23)` g. Number of moles of atom in 20 kg is :- A. 4 B. 40 C. 100 D. 500
Description : If a sample of pure sodium has a mass of 8.2 grams and sodium has an average atomic mass of 22.99 gmol how many sodium atoms are there in the sample?
Last Answer : Need answer
Description : Silver (atomic weight `108 g mol^(-1))` has a density of `10.5 g cm^(-3)`. The number of silver atoms on a surfaces of area `10^(-12) m^(2)` can be ex
Last Answer : Silver (atomic weight `108 g mol^(-1))` has a density of `10.5 g cm^(-3)`. The number of silver atoms on a ... `Y xx 10^(-x)`, The value of `x` is .
Description : How many neutrons does element x have if its atomic number is 22 and its mass number is 84?
Description : Atoms of the same element having same atomic number and different mass number are known as?
Last Answer : Isotopes
Description : At radioactive equilibrium, the ratio between two atoms of radioactive elements `A` and `B` is `3.1 xx 10^(9) : 1`. If the half-life period of `A` is
Last Answer : At radioactive equilibrium, the ratio between two atoms of radioactive elements `A` and `B` is `3.1 xx 10^(9) ... B. 3 yrs C. 3.3 yrs D. None of these
Last Answer : At radioactive equilibrium, the ratio between two atoms of radioactive elements `A` and `B` is `3.1 xx 10^(9) : ... . 4.65 yrs C. 5.46 yrs D. 5.64 yrs
Description : A reaction develop nuclear energy at the rate of `3 xx 10^(4) kW`. How many atoms of `.^(215)U` undergo fission per second? How much `.^(235)U` is bur
Last Answer : A reaction develop nuclear energy at the rate of `3 xx 10^(4) kW`. How many atoms of `.^(215)U` ... constant is `6.023 xx 10^(26)` per kg mole)
Description : Dentification: Atoms of the same element but with various atomic weight?
Last Answer : Isotope
Description : The sum of the mass numbers of the atoms in a molecule equals the ______, which is measured in units called _______. a. Atomic Number; Milligrams b. Mass Weight; Micrograms c. Chemical Weight; Moles d. Molecular Weight; Daltons
Last Answer : d. Molecular Weight; Daltons
Description : The total number of protons in 10 g of calcium carbonate is `(N_(0) = 6.023 xx 10^(23))` :-
Last Answer : The total number of protons in 10 g of calcium carbonate is `(N_(0) = 6.023 xx 10^(23))` :- A. `1.5057 ... 3.0115 xx 10^(24)` D. `4.0956 xx 10^(24)`
Description : Estimate the mass of the sun, assuming the orbit of Earth around the sun to be a circle. The distance between the sun and the Earth is `1.49 xx 10^(11
Last Answer : Estimate the mass of the sun, assuming the orbit of Earth around the sun to be a circle. The distance between the sun ... xx 10^(-11) Nm^(2) kg^(-2)`.
Description : A particular hydrogen like atom with radiation of frequency `2.467 xx 10^(15)Hz` when it makes transition from `n = 3 to n = 1` ,What will be the freq
Last Answer : A particular hydrogen like atom with radiation of frequency `2.467 xx 10^(15)Hz` when it makes transition from ... a transition from `n = 3 to n= 1`?
Description : Isotopes of an element have the same (A) Number of neutrons (B) Mass number (C) Electronic configuration (D) Atomic weight
Last Answer : (C) Electronic configuration
Description : What atoms of the same element but with various atomic weights?
Last Answer : These are the isotopes.
Description : All atoms with the same number of ______ in the atomic nucleus are the same element?
Last Answer : progdk
Description : Which one is different for the neutral atoms of the isotopes of an element? (A) Atomic weights (B) Atomic numbers (C) Number of protons (D) Number of electrons
Last Answer : (A) Atomic weights
Description : Which one of the following best defines the word allotropes ? A Different structural forms of an element B A pair of substances that differ by H+ C Elements that possess properties intermediate between ... a specific number of neutrons E The different phases (solid, liquid or gas) of a substance
Last Answer : A Different structural forms of an element
Description : What is 0.011 x 100?
Last Answer : 1.1
Description : Where is Country code 011?
Last Answer : Most countries with the Country Code 011 are in theCaribbean.
Description : 'Kyoto Protocol', an agreerne; signed by various =Indies, is associated with - (1) Clean Environment and Climate Change (2) Building common food stock to save human beings from any natural disaster (3) International Trade (4) Deep Sea 011 and Mineral Exploration
Last Answer : (1) Clean Environment and Climate Change Explanation: Kyoto Protocol (1997) is associated with the reduction of greenhouse gases.
Description : The porosity of sediments in sewer pipes, is usually taken as A. 0.010 B. 0.011 C. 0.012 D. 0.013
Last Answer : ANS: D
Description : A 3-input neuron is trained to output a zero when the input is 110 and a one when the input is 111. After generalization, the output will be zero when and only when the input is? a) 000 or 110 or 011 or 101 b) 010 or 100 or 110 or 101 c) 000 or 010 or 110 or 100
Last Answer : c) 000 or 010 or 110 or 100
Description : An octal number 237 is equal to the binary number 1) 010 011 111 2) 010 111 011 3) 011 101 101 4) 011 000 001
Last Answer : 3) 011 101 101
Description : The kinematic viscosity of an oil (in stokes) whose specific gravity is 0.95 and viscosity 0.011 poise, is (A) 0.0116 stoke (B) 0.116 stoke (C) 0.0611 stoke (D) 0.611 stoke
Last Answer : Answer: Option A
Description : A 3-input neuron is trained to output a zero when the input is 110 and a one when the input is 111. After generalization, the output will be zero when and only when the input is: a) 000 or 110 or 011 or 101 b) 010 or 100 or 110 or 101 c) 000 or 010 or 110 or 100 d) 100 or 111 or 101 or 001
Description : Number of atoms of He in 100 amu of He is : (Atomic mass of He is 4) :-
Last Answer : Number of atoms of He in 100 amu of He is : (Atomic mass of He is 4) :- A. 25 B. 100 C. 50 D. `100 xx 6 xx 10^(-23)`
Description : Atomic mass is an atoms number of what?
Last Answer : it depends because isotopes have different nucleon numbers but their atomic number stays the same.
Description : What is the number of atoms constituting a molecule known as - (1) Atomic number (2) Isotopes (3) Atomic mass (4) Atomicity
Last Answer : (4) Atomicity Explanation: Atomicity is the total number of atoms present in one molecule of an element.
Description : When the difference between mass number and atomic number of atoms of two or more elements are same, the atoms are termed as (A) Isomers (B) Isotopes (C) Isobars (D) Isotones
Last Answer : (D) Isotones
Description : The simplest formular of a compound containing 50% of element X (atomic mass 10) and 50% pf element Y (atomic mass 20) is :-
Last Answer : The simplest formular of a compound containing 50% of element X (atomic mass 10) and 50% pf element Y (atomic mass 20) ... C. `XY_(3)` D. `X_(2)Y_(3)`
Description : The isotope atoms differ in - (1) number of neutrons (2) atomic number (3) number of electrons (4) atomic weight
Last Answer : (1) number of neutrons Explanation: Important to note that isotope atoms have same atomic number.
Description : The number of atoms present in 21.6 gram of silver (atomic weight = 108) are same as the molecules in?
Last Answer : 12 moles of KMn0O4
Description : Estimate the number of atoms comprising a silicon chip that is 0.2 millimeters by 0.2 millimeters by 0.1 millimeters, given that the density of silicon is 2.34 grams per cubic centimeter, the number of atoms in a gram-weight is approximately 6 x 1023 atoms, and the atomic weight of silicon is 28:
Last Answer : ANSWER: 2 x 1017
Description : How many litres of `Cl_(2)` at STP will be liberated by the oxidation of `NaCl` with `10 g KMnO_(4)` in acidic medium: (Atomic weight: `Mn=55 and K=39
Last Answer : How many litres of `Cl_(2)` at STP will be liberated by the oxidation of `NaCl` with `10 g KMnO_(4)` in ... 3.54 B. 7.08 C. 1.77 D. None of these
Description : Calculate the number of atoms present in one drop of water having mass 1.8 g .
Last Answer : Calculate the number of atoms present in one drop of water having mass 1.8 g . A. `0.3N_(A)` B. `0.2N_(A)` C. `0.1N_(A)` D. `0.01N_(A)`
Description : How many C atoms are present in the sample of C3H8 with mass 5.31 g?
Description : A homogeneous reactor is the one, in which the (A) Fissile atoms are evenly distributed throughout the mass of nuclear reactor (B) Same substance (e.g. heavy water) is used as moderator & coolant (C) The fuel and the moderator is mixed to form a homogeneous material (D) All (A), (B) and (C)
Last Answer : (C) The fuel and the moderator is mixed to form a homogeneous material
Description : What are the steps needed to convert the mass of an element to the number of atoms in the element?
Description : Atoms of same element having different mass numbers are Called _______. (1) Isobars (2) Isotopes (3) (3)Isotones (4) (4) Isomers
Last Answer : (2) Isotopes Explanation: Atoms that have the same atomic number but different atomic masses are called isotopes. The difference in mass arises due to the atoms containing a different number of neutrons ... -14 are three isotopes of the element carbon with mass numbers 12, 13 and 14 respectively.
Description : It is important to balance the chemical equations to satisfy the law of conservation of mass. Which of the following statements of the law is incorrect? (a) The total mass of the elements present in ... the reaction (d) Mass can neither be created nor can it be destroyed in a chemical Reaction.
Last Answer : Answer : (c) The chemical composition of the reactants is the same before and after the reaction
Description : Atoms of same element having different mass numbers are called__________ (1) Isobars (2) Isotopes (3) Isotones (4) Isomers
Description : What would a object with a 22.6 density and 15.1 volume be in mass?
Last Answer : It would be 341.26 units of mass.
Description : How many moles are there in 140 g of Si (atomic mass of silicon is 28)?
Last Answer : 5
Description : An element X has a mass number 4 and atomic number 2. Write the valency of this element? -Science
Last Answer : Mass number = 4 Atomic number = 2 X is Helium. It has 0 valency and it will not react with any other atom because it has its outer shell filled.
Description : For an element , if atomic number (Z) and mass number (A) are 29 and 63 respectively . Then the number of protons , neutrons and electrons respectivel
Last Answer : For an element , if atomic number (Z) and mass number (A) are 29 and 63 respectively . Then the number of protons ... C. 29 , 34 ,29 D. 29 , 29 , 29
Description : A radioactive element A on disintegration gives two elements B and C. If B is helium and C is the element of atomic number 90 and atomic mass 234, the
Last Answer : A radioactive element A on disintegration gives two elements B and C. If B is helium and C is the element of atomic ... )^(234)Th` D. `._(91)^(234)Pa`