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3 years ago

Identify whether longhand notation or noble-gas notation was used in each case below.

Chemistry

1 answer:

n200080 [17]3 years ago

6 0

Answer:

The given electronic configuration is long hand notation.

Explanation:

Long-hand notation of representing electronic configuration is defined as the arrangement of total number of electrons that are present in an element.

Noble-gas notation of representing electronic configuration is defined as the arrangement of valence electrons in the element. The core electrons are represented as the previous noble gas of the element that is considered.

The given electronic configuration of potassium (K):

The above configuration has all the electrons that are contained in the nucleus of an element. Thus, this configuration is a long-hand notation.

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Brainliest for best answer

LekaFEV [45]

Answer:

Temperature, the average kinetic energy of particles, tells you how warm something is. Thermal energy, the total kinetic energy of the particles, tells you the extent to which a substance or object can transfer heat or make something else warmer. If an object's temperature increases, its thermal energy increases also.

Difference Between Temperature and Thermal Energy

a. Definition

Temperature: The average kinetic energy of the structural elements of a system (atoms, molecules, charged particles) is called temperature.

Thermal energy: The total kinetic energy of the structural elements of a system is called thermal energy.

b. Values

Temperature: The temperature can be positive and negative.

Thermal energy: The thermal energy always has positive values.

c. Units of measurement

Temperature: The temperature is measured in Celsius, Kelvin, and Fahrenheit.

Thermal energy: The thermal energy is measured in Joule and Calorie.

d. Quantitative dependence

Temperature: The temperature does not depend on the quantity of the substance – it is related to the average kinetic energy of the particles.

Thermal energy: The thermal energy depends on the quantity of the substance – it is related to the total kinetic energy of the particles.

2. The temperature on the Kelvin scale is bigger because the number 273 is always added to the Celcius temperature

3. There’s no really direct connection, however:

The thermal energy of the object is the kinetic energy of the individual molecules that make it up. The more fast-moving molecules inside it, the hotter it is.

When a moving object collides with something, some of the kinetic energy of the object turns into thermal energy. Warming something by rubbing it is an example of this.

4. For a thermometer that is liquid confined in a tube, as the temperature increases, the molecules of the liquid move faster, and the liquid expands. The amount of expansion is related to the increase in temperature.

hope it helps you , thank you

5 0

3 years ago

Why is the melting point of a network solid so high? How is this related to what a network solid is?

Alexxandr [17]

I believe that the answer to the question provided above is that molecules in solid are compact and are connected. It requires huge energy to move it, thus requires high temperature.
Hope my answer would be a great help for you. If you have more questions feel free to ask here at Brainly.

4 0

3 years ago

Determine the percent yield for the reaction

kkurt [141]

Answer:

The percent yield for Br₂ in the reaction = 96.15%

Explanation:

The balanced stoichiometric equation for the reaction is given as

2 NaBr + 1 Cl₂ → 2 NaCl + 1 Br₂

Percent yield

= 100% × (Actual yield)/(Theoretical yield)

To find the theoretical yield,

5.29 g of NaBr reacts with excess chlorine

gas; this means that NaBr is the limiting reagent because it is used up in the process of the reaction, hence, it determines the amount of products to be found.

So, we convert the 5.29 g of NaBr into number of moles.

Number of moles = (Mass)/(Molar mass)

Molar Mass of NaBr = 102.894 g/mol

Number of moles = (5.29/102.894) = 0.0514121329 = 0.05141 mole

From the stoichiometric balance of the reaction,

2 moles of NaBr give 1 mole of Br₂

0.05141 mole of NaBr will give (0.05141×1/2) mole of Br₂; that is, 0.0257 mole of Br₂

Theoretical yield = Mass of Br₂ expected from the reaction

= (Number of moles) × (Molar mass)

Molar mass of Br₂ = 159.808 g/mol

Theoretical yield of Br₂ = 0.0257 × 159.808 = 4.108 g

Percent yield

= 100% × (Actual yield)/(Theoretical yield)

Actual yield = 3.95 g

Theoretical yield = 4.108 g

Percent yield = 100% × (3.95/4.108) = 96.15%

Hope this Helps!!!

5 0

4 years ago

How many moles are in 1.806 x 1024 molecules of bromine?

Pepsi [2]

<h3>Answer:</h3>

2.999 mol Br

<h3>General Formulas and Concepts:</h3>

<u>Math</u>

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

<u>Chemistry</u>

<u>Atomic Structure</u>

Using Dimensional Analysis
Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

<h3>Explanation:</h3>

<u>Step 1: Define</u>

1.806 × 10²⁴ molecules Br

<u>Step 2: Identify Conversions</u>

Avogadro's Number

<u>Step 3: Convert</u>

<u /> $\displaystyle 1.806 \cdot 10^{24} \ molecules \ Br(\frac{1 \ mol \ Br}{6.022 \cdot 10^{23} \ molecules \ Br} )$ = 2.999 mol Br

<u>Step 4: Check</u>

<em>We are given 4 sig figs. Follow sig fig rules and round.</em>

Our final answer is already in 4 sig figs, so there is no need to round.

7 0

3 years ago

Read 2 more answers

I know that the answer is C. 8, but can you explain step by step how to get that answer?

Leya [2.2K]

Answer:

Explanation:

Oxidation:

$Fe^{2+} -->Fe^{3+}+e^{-}$

Reduction:

$Cr_{2}O_{7}^{2-}+6e^{-} -->2Cr^{3+}$

We have to equalise the number of moles of electrons gained and lost in a redox reaction in order to get a balanced reaction.

Hence we have to multiply the oxidation reaction throughout by 6.

and adding the two half-reactions we obtain:

$6Fe^{2+}+Cr_{2}O_{7}^{2-} -->6Fe^{3+}+2Cr^{3+}$

Still the total charge and number of oxygen is not balanced.

Since the reaction takes place in acidic conditions, we will add required number of H+ to the appropriate side to balance the charge and add half the amount of H2O to balance the hydrogen atoms.

We add 14 H+ on LHS and 7H2O on RHS to obtain:

$6Fe^{2+}+Cr_{2}O_{7}^{2-}+14H^{+} -->6Fe^{3+}+2Cr^{3+}+7H_{2}O$

Sum of coefficients of product cations = 6+2 = 8

4 0

3 years ago