1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Gekata [30.6K]
2 years ago
12

Help would be majorly appreciated

Chemistry
1 answer:
Sophie [7]2 years ago
6 0

Answer:

a) the atomic number is 15

b) the mass number is 15+16 = 31

c) element is phosphorus

d)Group 15 period 3

You might be interested in
Brainiest plsss helpp
djyliett [7]

Answer:

b 13kg/m³ is the answer to this question

8 0
3 years ago
Read 2 more answers
Need help on this question asap pleasee I would really appreciate it
Elza [17]

Answer:

See Explanation

Explanation:

An endothermic reaction is one in which energy is absorbed and the change in enthalpy for the reaction is positive.

If we look at the reaction 2HgO + 45kcal ----> 2Hg + O2; we will notice that

i) 45kcal of energy was taken in (absorbed) for the reaction to occur

ii) The value of the reaction enthalpy is positive

For these two reasons, the reaction is an endothermic reaction as written.

6 0
3 years ago
What is the molality of a solution of water and KCl if the freezing point of the solution is –3°C? (Kf = 1.86°C/m; molar mass of
Elina [12.6K]
Some of the solutions exhibit colligative properties. These properties depend on the amount of solute dissolved in a solvent. These properties include freezing point depression, boiling point elevation, osmotic pressure and vapor pressure lowering. Calculations are as follows:

<span> ΔT(freezing point)  = (Kf)mi
3  = 1.86 °C kg / mol (m)(2)
3 =3.72m
m = 0.81 mol/kg</span>

4 0
3 years ago
Read 2 more answers
What is the most important monosaccharide on Earth?
Lelechka [254]

Answer:

the answer is A Glucose

hope it helps!

6 0
3 years ago
What is the identity of the element, and how many neutrons does it have? An elements most stable ion forms an ionic compound wit
Pani-rosa [81]

Answer:

B. CA, 14

Explanation:

Atoms of elements contain small particles known as electrons, neutrons, and protons. The nucleus of an atom is made up of neutrons and protons which are at the center of the atom. Electrons on the other hand surrounds the nucleus. Electron has negative charge while proton has a positive charge. The number of neutrons is equivalent to the number of protons . In addition, the number of protons is equal to mass number minus the number of electrons.

For the compound XCl_{2}, it can be broken down into X^{2+} and 2Cl^{-}. Its ion has a mass of 34 and 18 electrons which means it has already lost 2 electrons.

Therefore:

For the given element, the number of electrons is 18+2 = 20 electrons.

The number of protons = 34 - 20 = 14.

And the number of neutrons is 14.

Only option B has the correct answer.

6 0
3 years ago
Other questions:
  • HELPPPPPP PLZZZZZ! FILE ATTACHED BELOW! ASAP PLZZZ!
    14·1 answer
  • A sample of air with a volume of 2.20m3 at a pressure of 105 KPa and a temperature of 30c is cooled to 10c and the pressure is r
    10·2 answers
  • How does the carbon chain length affect the polarity of an alcohol? What effect does this have on the solubility of the alcohol
    5·1 answer
  • PH + pOH = 14. What is the hydroxide concentration of a solution with pH of 8?
    13·1 answer
  • Which three elements seem to make up so much of the world around us?​
    7·1 answer
  • A
    9·1 answer
  • When does the composition of a substance does not change?
    12·1 answer
  • Write the equation of the chemical reaction of burning glucose (C6H12O6)​
    15·2 answers
  • Name 3 parts of an atom
    12·1 answer
  • The weights of all elements are always compared to oxygen.<br> True <br> False
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!