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
AnnZ [28]
3 years ago
15

Which of the following must be the same for two isotopes of an element? A. The number of neutrons B. The atomic number C. The ma

ss D. The charge
Answer is The atomic number
Chemistry
2 answers:
ASHA 777 [7]3 years ago
8 0
B. The atomic number. This is because the atomic number is the same as the number of protons an element has, and the number of protons defines an element.
Lana71 [14]3 years ago
7 0

Answer: B. The atomic number

Explanation:

You might be interested in
(pls help !!) question is in image
Anastaziya [24]

Answer:

the second option is correct

Explanation:

maybe I think b is correct

6 0
2 years ago
Describe the number and type of each component of the molecule methane
Tasya [4]

Answer:

Methane is a chemical compound with the molecular formula CH4. It is the main component in natural gas. Methane is considered the simplest of alkanes, compounds that consist only of hydrogen (H) and carbon (C) elements. Methane is an odorless, colorless, tasteless gas that is lighter than air.

Explanation:

4 0
3 years ago
The following reactions can be used to prepare samples of metals. Determine the enthalpy change under standard state conditions
mamaluj [8]

Answer:

a) 62.1 kJ/mol

b) 2.82 kJ/mol

c) 270.91 kJ/mol

d) -851.5 kJ/mol

Explanation:

The enthalpy change for a reaction in standard conditions (ΔH°rxn) can be calculated by:

ΔH°rxn = ∑n*ΔH°f, products - ∑n*ΔH°f, reagents

Where n is the number of moles in the stoichiometry reaction, and ΔH°f is the enthalpy of formation at standard conditions. ΔH°f = 0 for substances formed by only a single element. The values can be found in thermodynamics tables.

a) 2Ag₂O(s) → 4Ag(s) + O₂(g)

ΔH°f, Ag₂O(s) = -31.05 kJ/mol

ΔH°rxn = 0 - (2*(-31.05)) = 62.1 kJ/mol

b) SnO(s) + CO(g) → Sn(s) + CO₂(g)

ΔH°f,SnO(s) = -285.8 kJ/mol

ΔH°f,CO(g) = -110.53 kJ/mol

ΔH°f,CO₂(g) = -393.51 kJ/mol

ΔH°rxn = [-393.51] - [-110.53 - 285.8] = 2.82 kJ/mol

c) Cr₂O₃(s) + 3H₂(g) → 2Cr(s) + 3H₂O(l)

ΔH°f,Cr₂O₃(s) = -1128.4 kJ/mol

ΔH°f,H₂O(l) = -285.83 kJ/mol

ΔH°rxn = [3*(-285.83)] - [( -1128.4)] = 270.91 kJ/mol

d) 2Al(s) + Fe₂O₃(s) → Al₂O₃(s) + 2Fe(s)

ΔH°f,Fe₂O₃(s) = -824.2 kJ/mol

ΔH°f,Al₂O₃(s) = -1675.7 kJ/mol

ΔH°rxn = [-1675.7] - [-824.2] = -851.5 kJ/mol

3 0
3 years ago
What’s the difference between sucrose, fructose and glucose?
Sergeeva-Olga [200]

Answer:

Explanation:

Sucrose Is Made up of Glucose and Fructose

Glucose is a simple sugar or monosaccharide.

Fructose, or “fruit sugar,” is a monosaccharide like glucose

5 0
3 years ago
Sam toured India with his class. He saw many buildings that reminded him of buildings he saw in Saudi Arabia and in London.
melomori [17]
A) cultural diffusion
4 0
3 years ago
Read 2 more answers
Other questions:
  • To determine the concentration of a sample of calcium hydroxide, 1.45M HCl is added drop-wise using a burst. Write the balanced
    10·1 answer
  • Define the term specific heat.​
    15·2 answers
  • Which of the following is the most acidic?
    14·1 answer
  • The mass number of an atom is found by adding
    12·1 answer
  • If 20 ml of gas is subjected to a tempature change from 10 Celsius to 100 Celsius and a pressure change from 1 atm to 10 atm, th
    9·1 answer
  • Aluminum has a density of 2.70 g/cm^3. How Many moles of aluminum are in a 13.2 cm^3 block of the metal substance? Fill in the t
    6·1 answer
  • 24 CO2 (g) + 26 H2O (i ) + 15,026 kJ - 2 C12H26 (i ) + 37 O2 (g) ?<br><br> Endothermic or exothermic
    14·1 answer
  • Helppppp meeeeeeeeeeeeeeeeeeeeeeeeeeeee ill mark brainlist
    7·2 answers
  • Which type of energy is the tree changing the light energy into?
    13·2 answers
  • In a voltaic (galvanic) cell, oxidation occurs at the _____ and is where _____ in the salt bridge moves toward.
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!