An atom that has 13 protons and 15 neutrons is isotope of the elementa. nickel
b. silicon
c. aluminum
d. phosphorus. Why?
Answers
Atoms dont "lose" or "gain" protons, if they did, they'd be completely different elements. So basically, anything with 13 protons is a form of Aluminum.
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List and describe two powerful forces of nature caused by plate tectonics
Which of the examples represent potential energy A candy bar Wind A stretched rubber band Rowing a boat A ball rollinv down a hill A roller coaster at the top of a hill
Which sample of matter is a mixture? (1) Br2(ℓ) (3) KBr(s) (2) K(s) (4) KBr(aq)
Which of the following steps is important to critical thinking?
B. Higher
Answers
Answer:
Lower Temperature
Explanation:
The boiling point is defined as the temperature at which the vapor pressure of a given liquid becomes equal to the external pressure or atmospheric pressure. Boiling point is mainly effected by following factors:
1) Inter-Molecular Interactions:
Greater the intermolecular interactions greater will be the boiling point because more energy is required to overcome these intermolecular interactions.
Example:
Water = 100 °C
Diethyl ether = 34.5 °C
Water requires more energy because it contains hydrogen bond interactions which are considered the strongest intermolecular interactions. While, Diethyl ether lacks Hydrogen bondings.
2) External Pressure:
The boiling point also varies with changing the external pressure for the same solvent. Greater the external pressure greater will be the boiling points and vice versa.
Example:
Water:
External Pressure Boiling Point
1 atm 100 °C
0.921 atm 98 °C
0.425 atm 72 °C
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Answers
Calculate the Molar mass of H2O
now, atomic mass of H - 1
Atomic mass of O - 16
Now, molar mass = 1(2) + 16
= 2 +16
= 18 u = 18 grams (relative mass in grams)
forces would be
Answers
The answer is Y < X < Z
Answers
The name of the compound given in the question is nitrogen trifluoride.
What is a compound?
Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.
Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:
1)Molecular compounds where in atoms are joined by covalent bonds.
2) ionic compounds where atoms are joined by ionic bond.
3)Inter-metallic compounds where atoms are held by metallic bonds
4) co-ordination complexes where atoms are held by co-ordinate bonds.
They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.
Learn more about compounds ,here:
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Answer:
Nitrogen Trifluoride
Explanation:
#3. A substance that interferes with the action of a catalyst is known as a(n) _____.
A. negative inhibitor
/B. either an inhibitor or negative inhibitor /C. inhibitor /D. activated complex
#4. The reducing agent in the reaction described in Fe + 2HCl → FeCl2 + H2 is
A. Fe./B. HCl./C. FeCl2.
Answers
1) Answer is: D. both B and C.
Activated complex is collection of intermediate structures in a chemical reaction that forms while bonds are breaking and new bonds are forming.
The transition state is the configuration at the peak of the diagram while the activated complex can refer to any point near the maximum.
Activation energy is the minimum energy colliding particles must have in order to react.
2) Answer is: B. chemical equilibrium.
Balanced chemical reaction: A + B ⇄ C + D.
1) In a chemical reaction, chemical equilibrium is the state in which both reactants ( and BA) and products (C and D) are present in concentrations which have no further tendency to change with time.
2) At equilibrium, both the forward and reverse reactions are still occurring.
3) Reaction rates of the forward and backward reactions are equal and there are no changes in the concentrations of the reactants and products.
3) Answer is: C. inhibitor.
Inhibitor is a substance that decreases the rate of a chemical reaction.
Inhibitor can reduce the effectiveness of a catalyst in a catalysed reaction.
Catalysis is the increase in the rate of a chemical reaction due to the participation of an additional substance called a catalyst.
Reactions occur faster with a catalyst because they require less activation energy.
4) Answer is: A. Fe.
Balanced reaction: Fe + 2HCl → FeCl₂ + H₂.
Oxidation reaction: Fe⁰ → Fe⁺² + 2e⁻.
Reduction reaction: 2H⁺ + 2e⁻ → H₂⁰.
Reducing agent is an element or compound that loses an electron to another chemical species in a redox chemical reaction and they have been oxidized.
Iron (Fe) change oxidation number from 0 to +2 (lose electrons), iron is oxidized (reducing agent).
Answer :
1) The correct option is, (D) both B and C.
2) The correct option is, (D) both A and B
3) The correct option is, (C) inhibitor.
4) The correct option is, (A) Fe
Explanation :
For part 1 :
Activated complex or transition state : It is the state where the bonds are loosened and new lose bonds are formed between them. It is unstable state and immediately dissociates to form the stable products. The arrangement of atoms takes place at the peak of the activation energy barrier.
For part 2 :
The balanced chemical reaction is,
Chemical equilibrium : It is defined as a state where the rate of forward reaction is equal to the rate of backward reaction. That means there is no net change in the concentration of the reactants and the products.
Reversibility : It is defined as, in a reversible reaction when reactant A and B react to form products C and D and in the reverse reaction, C and D react to form A and B. That means process is reversible.
For part 3 :
Inhibitor : It is the substance that decreases the rate of the chemical reaction. It can reduce the effectiveness of the catalyst in a catalyzed reaction.
Or we can say that it is a substance that interferes with the action of a catalyst.
For part 4 :
The balanced redox reaction is :
The half oxidation-reduction reactions are:
Oxidation reaction :
Reduction reaction :
From this we conclude that the 'Fe' is the reducing agent that loses an electron to another chemical species in a redox chemical reaction and itself oxidized.
Hence, the reducing agent is, Fe
Answers
Answer: Therefore, the molar mass of the unknown substance is 68.4 g/mol.
Explanation: We can use the freezing point depression equation to solve for the molar mass of the unknown substance:
ΔT = Kf × m
where ΔT is the change in freezing point, Kf is the freezing point depression constant of the solvent (naphthalene), and m is the molality of the solution.
First, we need to calculate the molality of the solution:
molality = moles of solute / mass of solvent (in kg)
We don't know the number of moles of the unknown substance, but we can assume that the naphthalene does not contribute significantly to the total mass of the solution (since its mass is much smaller than the mass of the unknown substance). Therefore, we can use the entire mass of the solution (1000g + 12.3g = 1012.3g) as the mass of solvent.
mass of solute = 1000g
mass of solvent = 12.3g
mass of solution = 1012.3g
molality = (1000g / molar mass) / (12.3g / 1000g) = 81.3 / molar mass
Next, we need to calculate the change in freezing point:
ΔT = 1.2∘C
Finally, we can use the freezing point depression constant of naphthalene to solve for the molar mass of the unknown substance:
Kf for naphthalene = 6.8∘C/m
ΔT = Kf × m
1.2 = 6.8 × (81.3 / molar mass)
molar mass = 68.4 g/mol
Therefore, the molar mass of the unknown substance is 68.4 g/mol.