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
SVEN [57.7K]
3 years ago
11

Helpppppppppppppppppppppppppppppppppp

Chemistry
1 answer:
EastWind [94]3 years ago
4 0
These could all go either way, hardness and other special properties are what I'm guessing would be the most accurate in determining the kind of material.
luster, cleavage, streak, and color can all be affected by other factors. but I guess cleavage would also be accurate. so I guess hardness special properties and cleavage would be the most reliable.
You might be interested in
Which energy source uses a fuel that produces a large amount of energy from a small amount of fuel
Vitek1552 [10]
That would be either, nuclear power or wind power, depending on what the teacher is looking for...
8 0
3 years ago
The enthalpy of solution (dissolving) of sodium hydroxide is given below. Determine the change in temperature of a coffee cup ca
geniusboy [140]

Answer:

The change in temperature of a coffee cup calorimeter is 8.87°C.

Explanation:

Volume of the water = V = 150 g

Density of the water , d =1.0 g/mL

Mass of the water = M

M=d\times V=1.00 g/mL\times 150 ml =150.0 g

Mass of solution = m = M = 150.0 g

NaOH(s)\rightarrow NaOH(aq),\Delta H =-44.51 kJ/mol

Moles of NaOH = \frac{5.00 g}{40 g/mol}=0.125 mol

Energy released when 0.125 moles of NaOH added in water = Q

Q=0.125 moles\times (-44.51 kJ/mol)=-5.5638 kJ=-5,563.8 J

1 kJ = 1000 J

Heat gained by water = Q' = -Q ( conservation of energy)

Q'= 5,563.8 J

Specific heat of solution = c = 4.184 J/g°C

Change in temperature of the solution = \Delta T

Q'=mc\times \Delta T

5,563.8 J=150.0 g\times 4.184 J/g^oC\times \Delta T

\Delta T=\frac{5,563.8 J}{150.0 g\times 4.184 J/g^oC}=8.87^oC

The change in temperature of a coffee cup calorimeter is 8.87°C.

7 0
3 years ago
carbon dioxide at 25 degrees celsius and 101.3 kpa has a density of 1.799 kg/m^3 determine gas constant
dusya [7]

Answer:

Explanation:

Temperature of gas in absolute scale T = 25 + 273 = 298 .

pressure of gas P = 1.013 x 10⁵ N / m²

density D = 1.799 kg / m³

= 1799 g / m³

From gas formula

PV / T = n R Where P is pressure , V is volume and T is absolute temperature , n is no of moles

P / T = n R / V

P / T = m R /M V where m is mass of gas and M is molecular weight .

m / V = D ( density )

P / T = DR/ M  

PM / DT = R

Putting the values

1.013 x 10⁵ x 44  /  (1799 x 298)

R = 8.314.09 J / K mole

5 0
3 years ago
What is a chemical formula, and what does it tell you?
katrin2010 [14]

Explanation:

chemical formula tells you the specific elements included in the compound and the number of atoms of each. The letters in a chemical formula are the symbols for the specific elements. So for example, H means hydrogen.

7 0
2 years ago
Read 2 more answers
The following is a carbohydrates,lipid,protein or nucleic acid:Wax
Rasek [7]
A wax is a type of lipid. Waxes are nonpolar, so they are not soluble in water.
3 0
3 years ago
Other questions:
  • When the pH decreases from 6 to 3, the hydrogen ion, H+, increases by what?
    11·1 answer
  • Describe one advantage and one disadvantage of replacing standard bulbs with led lighting
    9·1 answer
  • There are two different compounds of sulfur and fluorine.
    14·1 answer
  • En que se equvoco adrew
    11·1 answer
  • How many particles can be stored in a 4.0 L container at room temperature (23 C) and standard atmospheric pressure
    15·1 answer
  • Why is it important for us to study outer space?
    15·1 answer
  • As the [H+] in a solution decreases, what happens to the [OH–]? A. It increases and the pH increases. B. It increases and the pH
    13·2 answers
  • Which is NOT a reason why organisms communicate with one another?
    11·2 answers
  • Determine the electron configuration of nitrogen numerically.
    10·2 answers
  • Platinum-189<br> What is the atomic number
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!