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Nuetrik [128]
3 years ago
12

Give the number of significant figures: 369,132,000 sec

Chemistry
2 answers:
Serggg [28]3 years ago
5 0

Answer : The number of significant figures in 369132000 sec are, six (6).

Explanation :

Significant figures : The figures in a number which express the value -the magnitude of a quantity to a specific degree of accuracy is known as significant digits.

Rules for significant figures are :

  • Digits from 1 to 9 are always significant and have infinite number of significant figures.
  • All non-zero numbers are always significant. For example: 654, 6.54 and 65.4 all have three significant figures.
  • All zero’s between integers are always significant. For example: 5005, 5.005 and 50.05 all have four significant figures.
  • All zero’s preceding the first integers are never significant. For example: 0.0078 has two significant figures.
  • All zero’s after the decimal point are always significant. For example: 4.500, 45.00 and 450.0 all have four significant figures.
  • All zeroes used solely for spacing the decimal point are not significant. For example : 8000 has one significant figure.

As per question,  

The given number is, 369,132,000

According to the rule, all zeroes used solely for spacing the decimal point are not significant. So, the number of significant figures in 369,132,000 are, 6.

Hence, the number of significant figures in 369132000 sec are, six (6).

Yuliya22 [10]3 years ago
3 0
The number of significant figures in 369,132,000 is 6

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<h3>Answer:</h3>

Homogeneous mixture with components of different boiling points

<h3>Explanation:</h3>
  • Distillation is a method of separating miscible mixtures which contain components that have different boiling points.
  • The mixture is heated and the component with the low boiling point evaporates first. It is then condensed in the condenser and the distillate collected using a clean beaker.
  • For example, a miscible solution of ethanol and water can be separated using distillation.
  • Ethanol and water have different boiling points of 78°C and 100°C respectively. Ethanol is distilled out first because it has a low boiling point compared to water.

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Describe the structure of atoms including locations and changes of protons,neutrons,and electrons
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Electrons are found on the electron shells, and the electron shells are found in in the outermost region of an atom. The outermost electron shell contains valence electrons. Electrons are negatively charged.

The number of protons vary depending on the atomic number of an atom. The number of neutrons vary depending on the atomic mass and atomic number of an atom. To find the neutron you must subtract the atomic mass from the atomic number. The number of electrons in a neutral atom also vary depending on the atomic number.

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2. A transformer only works with which type of current?
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A voltaic cell is constructed with a Cu/Cu²⁺ half-cell and an Ni/Ni²⁺ half-cell. The nickel electrode is negative.(a) Write bala
nalin [4]

The balanced redox reaction is

Cu + Ni²⁺ → Cu²⁺ + Ni

<h3>What is Galvanic cell? </h3>

It is a device that is used for the conversion of the chemical energy which is produce in the redox reaction into the electrical energy. It is also termed as the voltaic cell or electrochemical cell.

In the voltaic cell, at anode which is negative electrode of voltaic cell oxidation occurs and at the cathode which is positive electrode, reduction occurs

<h3>What is redox reaction? </h3>

The reaction in which both reduction and oxidation reaction takes place simultaneously is known as redox reaction.

<h3>What is oxidation reaction? </h3>

The reaction in which a substance or compound or species looses its electrons. In this reaction, oxidation state of an element increases.

<h3>What is reduction reaction? </h3>

The reaction in which a substance or compound or species accept the electrons. In this reaction, oxidation state of an element decreases.

The given two-half reactions are:

At anode:

Cu → Cu²⁺ + 2e-

At cathode:

Ni²⁺ + 2e- → Ni

Redox reaction:

Cu + Ni²⁺ → Cu²⁺ + Ni

According to the voltaic cell, the half-cell reaction (1) shows oxidation reaction therefore, it occurs at anode and the half-cell reaction (2) shows reduction reaction therefore, it occurs at cathode.

Thus, we concluded that the redox reaction is

Cu + Ni²⁺ → Cu²⁺ + Ni

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2 years ago
Bonds between carbon and oxygen (c=o) are more polar than bonds between sulfur and oxygen (s=o). nevertheless, sulfur dioxide (s
Harman [31]

Dipole moment can be defined as the product of magnitude of charge and the distance of separation between the charges. A dipole exists when two or more atoms with different electronegativities are bonded together to form a molecule. The resulting unequal sharing of electrons leads to a molecule with a net positive and a net negative end. Hence the molecule is said polar.

Bonds between carbon and oxygen (C=O) are more polar but carbon dioxide (CO2) does not exhibits a dipole moment because CO2 is a linear molecule and the charge is equally distributed amongst the entire molecule. When molecules have an even charge distribution then there is no dipole moment and the molecule is said to be non-polar. CO2 is a linear molecule, so the dipoles are symmetrical and are equal in magnitude but point in opposite directions so they cancel out each other effect and we get net dipole moment zero.

On the other hand sulfur dioxide (SO2) exhibits a dipole moment because unlike CO2 molecule SO2 is not a linear molecule because of the presence of lone pair on Sulfur (S) atom , the geometry of SO2 is bent. This bent orientation of the oxygen's with respect to the sulfur results in the uneven distribution of positive and negative charges between the sulfur atom and the two oxygen atoms in the diagonal-shaped sulfur dioxide molecule. So the dipoles are not equal in magnitude and they do not cancel out and SO2 molecule exhibit a net dipole moment.

NOTE: If the molecule is linear, the dipoles are equal and exactly opposite in direction, so like a perfectly equal tug-of-war, they cancel each other out, and there is no net dipole in the molecule.

CO2 (linear molecule) = The dipoles are equal and exactly opposite in direction. They cancel each other out, and there is no net dipole in the molecule.

SO2 ( bent shape not linear) = Their is an uneven distribution of positive and negative charges between the sulfur atom and the two oxygen atoms. Dipoles are not equal in magnitude and they do not cancel out and SO2 molecule exhibit a net dipole moment.

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3 years ago
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