What term represents a type of nuclear reaction

Answers

Answer 1

Answer: Natural transmutation

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Chemicals secreted by glands which regulate tissues or organs are called______

Answers

Chemicals secreted by glands which regulate tissues or organs are called hormones. Endocrine glands are responsible for regulating body activities. Endocrine glands release chemicals that are called hormones which help the body to function properly. the endocrine system regulate many internal processes.

Answer:

Hormones

hope i helped!

A solution of ammonia has a pH of 11.8. What is the concentration of OH– ions in the solution?

Answers

The concentration of $OH^-$ ions in the solution is 0.0063 M

What is pH?

pH is a quantitative measure of the acidity or basicity of aqueous or other liquid solutions.

pH or pOH is the measure of acidity or alkalinity of a solution.

pOH is calculated by taking negative logarithm of hydroxide ion concentration.

pH = -log [ $OH^-$ ]

pH + pOH = 14

11.8 + pOH = 14

pOH = 2.2

Putting in the values:

2.2 =-log [ $OH^-$ ]

[ $OH^-$ ] =0.0063 M

Hence, the concentration of $OH^-$ ions in the solution is 0.0063 M

Learn more about the pH here:

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Answer:

[OH⁻] = 6.31 × 10⁻³ M

SOlution:

Step 1: Calculate pOH as,

pH + pOH = 14

As, pH = 11.8

So,

11.8 + pOH = 14

Or,

pOH = 14 - 11.8

pOH = 2.2

Step 2: Calculate [OH⁻],

pOH is related to [OH⁻] as,

pOH = - log [OH⁻]

Putting value of pOH,

2.2 = -log [OH⁻]

Solving for [OH⁻],

[OH⁻] = 10⁻²'² ∴ 10 = Antilog

[OH⁻] = 6.31 × 10⁻³ M

Marshall determines that a gas has a gage pressure of 276 kPa. What's the absolute pressure of this gas? A. 326 kPa
B. 156 kPa
C. 376 kPa
D. 176 kPa

Answers

Answer: The absolute pressure is 376 kPa.

Explanation :

The absolute pressure of a gas is defined as the sum of gauge pressure and the atmospheric pressure.

We know that the atmospheric pressure of a gas is 101.3 kPa.

So, Absolute pressure becomes 276 kPa + 101.3 kPa = 377.3 kPa

Approximately it can be written as, 376 kPa.

So, the correct option is (C) " 376 kPa ".

Hence, this is the required solution.

C.... 376 tbh just took the test and was right

Mass of 2.88x10^-4 mol of ascorbic acid

Answers

Molar mass C₆H₈O₆ = 176.12 g/mol

1 mole ------------------ 176.12 g
2.88x10⁻⁴ mole ------- ?

mass = 2.88x10⁻⁴ * 176.12 / 1

mass ≈ 0.05072 g

hope this helps!

At STP, which of these substances is most soluble in H2O?(1) CCl4 (3) HCl
(2) CO2 (4) N2

Answers

The correct answer is option 3. Hydrochloric acid is the most soluble in water at standard temperature and pressure because it is has a polar covalent bond which makes it a polar molecule. Water is also a polar substance therefore hydrochloric acid will really be soluble in water.

Answer: Option (3) is the correct answer.

Explanation:

It is known that like dissolves like that is, a polar solvent will dissolve only polar compounds. Whereas a non-polar solvent will dissolve only non-polar compound.

Substances whose atoms have large difference in electronegativities are polar in nature. Water is a polar solvent and it is able to dissolve polar molecules.

For example, HCl is a polar or ionic compound so it is soluble in water.

On the other hand, $CCl_(4)$ , $CO_(2)$ , and $N_(2)$ are all non-polar as bond between them is formed due to sharing of electrons.

Hence, we can conclude that at STP, HCl is the substance that is most soluble in $H_(2)O$ .

The element carbon (C) is most likely to form covalent bonds with the element beryllium (Be). krypton (Kr). selenium (Se). sodium (Na).

Answers

The element that is most likely to form covalent bonds with carbon (C) is

Selenium (Se)

Explanation

Covalent bond is formed when there is sharing of electrons among two or more non metals.

Both carbon and selenium are non metals therefore they react to form a covalent bond by sharing electron.

Despite krypton been a non metal it does not form a covalent bond with carbon since krypton is inert ( non reactive).

Beryllium (Be) and sodium (Na) are metals therefore they form ionic bond with carbon instead of covalent bond.

Answer: Option (c) is the correct answer.

Explanation:

Atomic number of carbon is 6 and its electronic configuration is 2, 4. So, in order to complete its octet, it requires 4 more electrons.

Therefore, carbon form covalent bonds, that is, it shares electrons with and electron deficient atom.

Krypton is a noble gas and has completely filled octet. So, it will neither give to share its electrons with carbon atom.

Whereas beryllium and sodium does not have enough valence electrons to share. Hence, they will not form bond with carbon atom.

On the other hand, selenium being a non-metal is electron deficient and therefore, in order to complete its octet it will share its electrons with carbon atom.

Thus, we can conclude that the element carbon (C) is most likely to form covalent bonds with the element selenium (Se).

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