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
Anton [14]
3 years ago
5

A(n) ____________ is a substance in which all the exact combinations of elements are always the same.

Chemistry
1 answer:
sveta [45]3 years ago
3 0
B. compound
source is Glencoe Science book grade 7.
Also I just happening to be learning about this at school
You might be interested in
Which two factors affect the amount of thermal energy an object has?
Neporo4naja [7]

Answer:

Explanation:

What would the answer be?

6 0
3 years ago
The monomer of poly(vinyl chloride) has the formula C2H3Cl. If there are 1,565 repeat units in a single chain of the polymer, wh
monitta

Answer:

\large \boxed{9.780 \times 10^{4}\text{ u}}

Explanation:

The molecular mass of a monomer unit is:

C₂H₃Cl = 2×12.01 + 3×1.008 + 35.45 = 24.02 + 3.024 + 35.45 = 62.494 u

For 1565 units,

\text{Molecular mass} = \text{1565 units} \times \dfrac{\text{62.494 u}}{\text{1 unit }} = \mathbf{9.780 \times 10^{4}}\textbf{ u}\\\\\text{The molecular mass of the chain is $\large \boxed{\mathbf{9.780 \times 10^{4}}\textbf{ u}}$}

8 0
3 years ago
Determine if the equation is endothermic or exothermic examples
Fittoniya [83]
There are a couple of ways todetermine if a reaction is exothermic or endothermic. Endothermic meaning that heat is added to the reaction to make the reactants interact and exothermic meaning heat is released during the reaction between the two reactants.


In endothermic reactions you can find a triangle above the arrow.
6 0
3 years ago
Which of the following is not a correct chemical equation for a double displacement reaction?
Step2247 [10]

Answer:

B. CaCl + LiCO3 yields CaCO3 + LiCl is not correct

It should be CaCl2 + Li2CO3  → 2LiCl + CaCO3

Explanation:

For a reaction to be double displacement reaction there are two things we need to look for

1) There must be an interchange of the group of ions

2) The reactants must dissolve in water to release ions

A. 2RbNO3 + BeF2 yields Be(NO3)2 + 2RbF

2Rb+ + NO3- + Be^2+ + 2F- → Be(NO₃)₂ + 2RbF

This is correct

B. CaCl + LiCO3 yields CaCO3 + LiCl

This is not correct

The correct equation is:

CaCl2 + Li2CO3  → Ca2+ + 2Cl- + 2Li+ + CO3^2-  → 2LiCl + CaCO3

C. Na3PO4 + 3KOH yields 3NaOH + K3PO4

3Na+ + PO4^3- + 3K+ + 3OH- → 3NaOH + K3PO4

This is correct

D. 2MgI2 + Mn(SO3)2 yields 2MgSO3 + MnI4

2Mg^2+ + 4I- + Mn^4+ + 2SO3^2- → 2 MgSO3 + MnI4

This is correct

8 0
3 years ago
Working with one sample at a time, add water to the glass one tablespoon at a time. Water should soak the sample from the bottom
Vedmedyk [2.9K]

Answer:

This is confusing

but if you still need help, you can search it online

Explanation:

7 0
2 years ago
Read 2 more answers
Other questions:
  • Which carbonyl compounds do not undergo an aldol reaction when treated with −oh in h2o? select all that apply?
    12·1 answer
  • For the IMAGINARY molecular compound fluorine tri nitride having the formula: FN3
    5·1 answer
  • how many moles of hydrogen are evolved when an excess of sodium metal is added to one mole of citric acid?
    7·1 answer
  • The reaction A + B ⟶ C + D rate = k [ A ] [ B ] 2 A+B⟶C+Drate=k[A][B]2 has an initial rate of 0.0640 M / s. 0.0640 M/s. What wil
    9·1 answer
  • Which is the equation of a circle with its center at (-4,2) and a radius of 4?
    15·1 answer
  • Which of the following is not a good safety practice in the kitchen?
    7·2 answers
  • 7/3 Lithium. Protons,<br> NEUTRONS &amp; Electrons
    11·1 answer
  • 100POINTS!!!!<br><br> Label each reaction to either homogeneous OR heterogeneous
    11·1 answer
  • Art a the ph of a 0. 25 m aqueous solution of hydrofluoric acid, hf, at 25. 0 °c is 2. 3. What is the value of ka for hf
    15·1 answer
  • Under which conditions of temperature and pressure, the real gas behave ideally?​
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!