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
mezya [45]
3 years ago
15

Is a pencil a compound or an element and is a pencil heterogeneous or homogeneous

Chemistry
2 answers:
masya89 [10]3 years ago
6 0

Answer:

Pencil is an element and a heterogeneous mixture

Explanation:

miskamm [114]3 years ago
6 0

Answer:

Pencil is an element and a heterogeneous mixture

Explanation:

You might be interested in
Sometimes the oxidation state of an analyte must be adjusted before it can be titrated.
alexdok [17]

Answer:

Explanation:

True

5 0
3 years ago
sample with masses 0.12g,1.8g, and 0.562g are mixed together the combind mass of the three samples expressed to the correct numb
allsm [11]

Answer:

2.5 g

Explanation:

Given data:

Masses of sample = 0.12 g, 1.8 g, 0.562 g

Combine mass of samples = ?

Solution:

When we add or subtract the values the number of significant figures after decimal in result must be equal to the given measurement having less number of decimal places.

0.12 g + 1.8 g + 0.562 g

2.482 g

In given three measurements 1.8 has less number of significant figure after decimal point which is only one digit. Thus the final value must contain one digit after decimal.

we will round of 2.482 g.

2.5 g

because the next digit after 4 is 8 that's why we will round 4 to 5.

3 0
3 years ago
If the only thing we are interested in studying is how the number of particles affects pressure, what variables do we have to be
andre [41]
I’m sorryvvvgccxxggcfg
6 0
3 years ago
At 650 K, the reaction MgCO3(s)⇌MgO(s)+CO2(g)MgCO3(s)⇌MgO(s)+CO2(g) has Kp=0.026Kp=0.026. A 10.0-L container at 650 K has 1.0 g
Ray Of Light [21]

Answer:

0.4076 g

Explanation:

Kp is the equilibrium constant based on pressure and depends only on gas substances. For a generic reaction

aA + bB ⇄ cC + dD

Kp = \frac{(pC)^c*(pD)^d}{(pA)^a*(pB)^b}, where pX is the pressure of X in equilibrium.

For the reaction Kp = pCO₂

pCO₂ = 0.026 atm

The system is in equilibrium at the beginning. The compression occurs at a constant temperature, so using Boyle's law

P1V1 = P2V2

0.026*10 = P2*0.1

P2 = 2.6 atm

The reaction will reach again the equilibrium, and pCO₂ = 0.026 atm, then the rest will form MgCO₃, which will be 2.6 - 0.026 = 2.574 atm.

By the ideal gas law:

PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant (0.082 atm*L/mol*K), and T is the temperature.

2.574*0.1 = n*0.082*650

53.3n = 0.2574

n = 4.83x10⁻³ mol

The stoichiometry of the reaction is 1 mol of MgCO₃ for 1 mol of CO₂, so it will form 4.83x10⁻³ mol of MgCO₃  .

The molar mass is:

MgCO₃: 24 g/mol of Mg + 12 g/mol of C + 3*16 g/mol of O = 84 g/mol

The mass formed is the molar mass multiplied by the number of moles:

m = 84x4.83x10⁻³

m = 0.4076 g

3 0
3 years ago
PLS HELP ASAP. *IF* THE ANSWER IS CORRECT I'LL MARK YOU AS BRAINIEST:
dybincka [34]

Answer: C: limestone cave formations

6 0
3 years ago
Other questions:
  • What quantity, in grams, of methanol, CH3OH, is required to prepare a 0.244 m solution in 400. g of water?
    7·2 answers
  • Im teaching myself chemistry and need a guide. anyone game?
    15·1 answer
  • All molecules are made up of: <br> A)hydrogen <br> B)minerals <br> C)atoms <br> D)gas
    15·2 answers
  • I put 40 points on this!!! PLEASE HELP!! I NEED AN A OR MY MOM IS GONNA KILL ME!
    11·1 answer
  • Is sodium benzoate soluble in NaOH, NaHCO3
    11·2 answers
  • Calculate average kinetic energy of one mole of gas at 517K
    14·1 answer
  • PLEASE HELP! How does one determine how much of a molecule is produced in a reaction?
    7·1 answer
  • Use what you know about the orbits of Earth and the moon to sort the phrases into the correct Category.
    15·1 answer
  • Calculate the molecules in 9.78 moles of oxygen gas
    13·1 answer
  • 2.8 dm3 of gas X at STP has equal mass with 11.2 dm3 of C2H6 at STP. What is
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!