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3 years ago

Which of the following is a monatomic anion? a) NH4+ b) Fr+ c) SO42– d) F-

Chemistry

2 answers:

Y_Kistochka [10]3 years ago

8 0

I think that it's d) F- but I'm not sure.

spin [16.1K]3 years ago

4 0

Answer:

d) F⁻

Explanation:

An anion is an ion that has a net negative charge. Ions such as OH⁻, NO₃⁻ or Cl⁻ are anions.

Monatomic means that it is made of only one atom. Mono=one. Ions such as H⁺, Na⁺ or S²⁻ are monoatomic, whereas ions such as OH⁻, NH₄⁺ or CN⁻ are polyatomic.

With this information in mind, the option that is both monatomic and an anion is d), F⁻.

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sucrose is composed of carbon hydrogen and oxygen which of the following is not needed in order to determine the precent by mass

Dimas [21]

Explanation:

It is often desirable to determine the mass percent of elements in a given compound.

To determine the mass percent of elements:

Evaluate the formula mass of the compound. This is done by summing the atomic masses of the atoms in the compound together.
The mass percentage is determined by pacing the mass contribution of each element or group to the formula mass of the compound and multiply by 100.

Learn more:

Percent by mass brainly.com/question/5544078

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3 0

3 years ago

We make a basic solution by mixing 50. mL of 0.10 M NaOH and 50. mL of 0.10 M Ca(OH)2. It requires 250 mL of an HCl solution to

andreyandreev [35.5K]

Answer: The correct answer is Option 5.

Explanation:

To calculate the molarity of the solution after mixing 2 solutions, we use the equation:

$M=\frac{n_1M_1V_1+n_2M_2V_2}{V_1+V_2}$

where,

$n_1,M_1\text{ and }V_1$ are the n-factor, molarity and volume of the NaOH.

$n_2,M_2\text{ and }V_2$ are the n-factor, molarity and volume of the $Ca(OH)_2$

We are given:

$n_1=1\\M_1=0.10M\\V_1=50mL\\n_2=2\\M_2=0.1\\V_2=50mL$

Putting all the values in above equation, we get:

$M=\frac{(1\times 0.1\times 50)+(2\times 0.1\times 50)}{50+50}\\\\M=0.15M$

To calculate the molarity of acid, we use the equation given by neutralization reaction:

$n_1M_1V_1=n_2M_2V_2$

where,

$n_1,M_1\text{ and }V_1$ are the n-factor, molarity and volume of acid which is $HCl$

$n_2,M_2\text{ and }V_2$ are the n-factor, molarity and volume of base.

We are given:

$n_1=1\\M_1=?M\\V_1=250mL\\n_2=1\\M_2=0.15M\\V_2=100mL$

Putting values in above equation, we get:

$1\times M_1\times 250=1\times 0.15\times 100\\\\M_1=0.06M$

Hence, the correct answer is Option 5.

7 0

3 years ago

Write the Keq for the dissolving of salt: NaCl → Na+ + Cl-.

Phantasy [73]

Keq=[Na+][Cl-]/[NaCl]

7 0

3 years ago

A piece of fossilized wood has a carbon-14 radioactivity that is 1/4 that of new wood. the half-life of carbon-14 is 5730 years.

Marizza181 [45]

Answer:

1.146 x 10⁴ year.

Explanation:

The decay of carbon-14 is a first order reaction.

The rate constant of the reaction (k) in a first order reaction = ln (2)/half-life = 0.693/(5730 year) = 1.21 x 10⁻⁴ year⁻¹.

The integration law of a first order reaction is:

kt = ln [A₀]/[A]

k is the rate constant = 1.21 x 10⁻⁴ year⁻¹.

t is the time = ??? years.

[A₀] is the initial percentage of carbon-14 = 100.0 %.

[A] is the remaining percentage of carbon-14 = 1/4[A₀] = 25.0 %.

∵ kt = ln [Ao]/[A]

∴ (1.21 x 10⁻⁴ year⁻¹)(t) = ln (100.0%)/[25.0 %]

(1.21 x 10⁻⁴ year⁻¹)(t) = 1.386.

∴ t = 1.386/ (1.21 x 10⁻⁴ year⁻¹) = 1.146 x 10⁴ year.

3 0

3 years ago

Describe the region in model 1 where the highest concentration of hydrogen ion (h+) is located.

Jobisdone [24]

The highest concentration of hydrogen ion (H+) is located in the intermembrane space. The intermembrane space is the space between inner membrane and the outer membrane of the mitochondrion or chloroplast. THe main function of intermembrane is oxidative phosphorylation.

8 0

3 years ago