A 9.168 M aqueous solution of h2so4 has a density of 1.4987 g/mL at 20°. How many grams of h2so4 are in 50.0 g of this solution?

Fill in the missing mass number and atomic number for each of these particles or types of radiation.

Akimi4 [234]

Answer:

Particle / mass number atomic number

type of radiation

alpha / ⁴₂ He 4 2

beta / e⁰ 0 - 1

gamma / γ 0 0

neutron / n 1 0

Explanation:

These are the basic types of radiation: alpha (α), beta (β), gamma (γ), and neutrons (n).

The radiation is emitted by unstable nuclei when undergo radiactive decay or by nuclei that are shooted by other particles.

Alpha radiation (⁴₂ He):

They are nuclei of helium-4 atoms: 2 protons and 2 neutrons.

Hence, the atomic number, which is the number of protons, of these particles, is 2; and the mass number, which is the sum of protons and neutrons, is 2 + 2 = 4.

The symbol of this radiation is ⁴₂ He, where the superscript to the left of the chemical symbol is the mass number and the subscript to the left of the chemical symbol is the atomic number.

Beta (⁰₋ ₁ e)

These are electrons emiited from an unstable nucleus. The symbols used for this particle are either ⁰₋ ₁β or ⁰₋ ₁e.

The superscript 0 indicates that the relative mass of this particle is practically zero and the subscript -1 tells that the emission of electrons increases the atomic number of the nucleus that emits it.

Gamma (⁰₀γ)

The gamma rays are electromagnetic radiation of high (the highest) energy.

The both superscript and subscript are zero, meaning that this radiation does not change either the mass or atomic numbers of the nucleus.

Neutron (¹₀n):

Neutrons are also emiited from the nucleus and so they may be considered a radiation.

The atomic number of neutrons is 0 (since it does not have protons) and its mass number is 1.

4 0

3 years ago

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Which statement describes the moment magnitude scale?

Pavel [41]

Answer:

It shows only the strength of seismic waves that were produced.

Explanation:

6 0

3 years ago

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A reaction that is second-order in one reactant has a rate constant of 1 × 10–2 L/mol · s. If the initial concentration of the r

Harlamova29_29 [7]

Answer : It take time for the concentration to become 0.180 mol/L will be, 277.8 s

Explanation :

The integrated rate law equation for second order reaction follows:

$k=\frac{1}{t}\left (\frac{1}{[A]}-\frac{1}{[A]_o}\right)$

where,

k = rate constant = $1\times 10^{-2}mol/L.s$

t = time taken = ?

[A] = concentration of substance after time 't' = 0.180 mol/L

$[A]_o$ = Initial concentration = 0.360 mol/L

Putting values in above equation, we get:

$1\times 10^{-2}=\frac{1}{t}\left (\frac{1}{0.180}-\frac{1}{0.360}\right)$

$t=277.8s$

Hence, it take time for the concentration to become 0.180 mol/L will be, 277.8 s

7 0

3 years ago

In the reaction,

jonny [76]

Answer:

In the reaction, Fe2+ is oxidized and MnO4- is reduced (option c.)

Explanation:

MnO₄⁻ + 5Fe²⁺ + 8H⁺ ---> Mn²⁺ + 5Fe³⁺ + 4H2O

Look all, the oxidation number.

Increase the oxidation number means, oxidation.

Decrease the oxidation number means, reduction.

Fe²⁺ → Fe³⁺ is increasing, the ox. number. Fe is oxidizing.

In MnO₄⁻, the Mn acts with +7, so in Mn²⁺ has decrease the ox. number.

Mn has reducted.

5 0

3 years ago

What is a group of specialized cells called when they work together to perform a specific function?

Nadya [2.5K]

Answer: Tissue

Explanation:

group of organized cells doing specific function is tissue group of organized tissues doing a specific function is an organ a group of organized organs doing a specific function is organ system and a group of organized organ systems doing a specific function would be an organism.

3 0

3 years ago