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3 years ago

What does the electronegativity of an atom indicate?

Chemistry

2 answers:

mezya [45]3 years ago

8 0

What does the electronegativity of an atom indicate?

D. The energy required to gain or lose an electron.

svp [43]3 years ago

4 0

Answer:

A. The tendency of the atom to pull on electrons

Explanation:

Took the quiz for A⃣ p⃣ e⃣ x⃣ , its A

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Determine the empirical formula of an oxide of iron, which has 69.9% iron and 30.1% dioxygen by mass.

Zina [86]

Answer:

again same questions

i think its from 1st chapter

4 0

3 years ago

What information does the atomic number provide about an atom?

rjkz [21]

Identifies the number of protons a single atom of the element contains.

The atomic number helps people identify elements according to the number of protons one atom of the element has. It essentially defines the element

6 0

3 years ago

A chemistry student weighs out of lactic acid into a volumetric flask and dilutes to the mark with distilled water. He plans to

34kurt

Answer:

28.0mL of the 0.0500M NaOH solution

Explanation:

0.126g of lactic acid diluted to 250mL. Titrated with 0.0500M NaOH solution.

The reaction of lactic acid, H₃C-CH(OH)-COOH (Molar mass: 90.08g/mol) with NaOH is:

H₃C-CH(OH)-COOH + NaOH → H₃C-CH(OH)-COO⁻ + Na⁺ + H₂O

Where 1 mole of the acid reacts per mole of the base.

You must know the student will reach equivalence point when moles of lactic acid = moles NaOH.

the student will titrate the 0.126g of H₃C-CH(OH)-COOH. In moles (Using molar mass) are:

0.126g ₓ (1mol / 90.08g) = 1.40x10⁻³ moles of H₃C-CH(OH)-COOH

To reach equivalence point, the student must add 1.40x10⁻³ moles of NaOH. These moles comes from:

1.40x10⁻³ moles of NaOH ₓ (1L / 0.0500moles NaOH) = 0.0280L of the 0.0500M NaOH =

<h3>28.0mL of the 0.0500M NaOH solution</h3>

8 0

3 years ago

Based on the recipe for the Dextrose Calcium Carbonate (DCC) medium, what is the percent concentration (%weight/volume) of dextr

yanalaym [24]

Answer: The percent concentration ( % m/v) of dextrose in the solution is 2 %

Explanation:

We are given:

Mass of Yeast Extract = 5.0 grams

Mass of $K_2HPO_4$ = 1.0 grams

Mass of $MgSO_4$ = 0.5 grams

Mass of Dextrose = 20.0 grams

Mass of $CaCO_3$ = 10. grams

Mass of Agar = 18.0 grams

Volume of solution = 1 L = 1000 mL (Conversion factor: 1 L = 1000 mL)

% (m/v) is defined as the concentration, which is mass of solute present in 100 mL of solution

To calculate the mass of solute, we apply unitary method:

In 1000 mL of solution, the mass of dextrose present is 20.0 grams

So, in 100 mL of solution, the mass of dextrose present will be = $\frac{20.0}{1000}\times 100=2g$

Calculating the % (m/v) of dextrose, we get:

$\% \text{(m/v) of dextrose}=\frac{\text{Mass of dextrose}}{\text{Volume of solution}}\times 100\\\\\% \text{(m/v) of dextrose}=\frac{2g}{100mL}\times 100=2\%$

Hence, the percent concentration ( % m/v) of dextrose in the solution is 2 %

4 0

4 years ago

Based on periodic trends which atom has a larger ionization energy then calcium Ca?

jonny [76]

Answer:

Gallium, Germanium, Arsenic, Selenium, Bromine and Krypton

Explanation:

Based on periodic trends, the atom that has a larger ionization energy than calcium are Gallium, Germanium, Arsenic, Selenium, Bromine and Krypton.

Across the period, the ionization energy increases from left to right.

Ionization energy is the energy required to remove the most loosely held electron within an atom.
As you go from left to right, the ionization energy increases rapidly.
The elements to the right of Ca will have a higher ionization energy compared to Ca.

8 0

3 years ago