A student needs to determine the density of an unknown rock sample by dropping the rock into a graduated cylinder containing water. The original volume in the graduated cylinder is 23.0 ml. The student then drops the rock sample into the graduated cylinder and determines the new volume to be 30.0 ml. If
the mass of the rock is determined to be 20.4 grams, what is the density of this sample?

Answer:

84.2 degrees

Explanation:

Olaf the snowman has an heat capacity of ice while the coffee can be

assumed to have the same heat capacity of water.

Reasons:

The heat lost by the coffee = The heat gained by Olaf...(1)

ΔQ = m₁·c₁·(T₃ - T₁) = m₂·c₂·(T₂ - T₃)

Mass of the snowman, m₁ = 38 kg

Initial temperature of the snowman, T₁ = -4.2°C

Volume of coffee, V = 15 mL = 0.000015 m³

Initial temperature of the coffee = 80.0 °C

Specific heat capacity of the snowman, c₁ = 2.097 J/(g·°C)

Specific heat capacity of the coffee, c₂ = 4.187 J/(g·°C)

Latent heat of fusion of the coffee into ice = 334 J/g

Density of the ice, ρ₂ = 997 kg/m³

Solution:

Mass of the coffee, m₂ = 0.000015 m³ × 997 kg/m³ = 0.014955 kg = 14.955 grams

Heat given to convert the coffee to ice = 334 J/g × 14.955 g = 4,994.97 J

Heat given to cool the coffee to 0°C = 14.955×4.187×80.0 = 5009.3268

Heat given to cool the coffee to 0°C = 5,009.3268 J

Heat given to reduce the temperature of the coffee turned to ice is

presented as follows;

Heat to cool frozen coffee = 14.955 × 2.108 × T₃ = 31.52514·T₃

Heat gained by Olaf = m₁·c₁·(T₃ - T₁) = 38,000× 2.097 × (T₃ - (-4.2))

Which from equation (1) gives

4,994.97 + 5009.3268 + 31.52514·T₃ = 38,000× 2.097 × (T₃ - (-4.2))

Solving with a graphing calculator, gives;

T₃ ≈ -4.08 °C

The final temperature of Olaf, T₃ ≈ -4.08 °C

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Answer:

Group 2 is the correct answer.

Explanation:

Chlorine has a charge -1. It means that X is +2 so that the formula is XCl2.

Atomic weight of metal : 24

Proust states the Comparative Law that compounds are formed from elements with the same Mass Comparison so that compounds have a fixed composition of elements

Divalent metal oxide=XO

MW O = 16

MW XO₂ =  X+16

[tex]\tt \%mass=\dfrac{Ar~X}{X+16}\times 100\%\\\\0.6=\dfrac{X}{X+16}\\\\0.6(X+16)=X\\\\0.6X+9.6=X\\\\0.4X=9.6\rightarrow X=24[/tex]

Answer:

2.7g/cm³

Explanation:

Given parameters:

Dimension of the aluminum  = 10.5cm x 10.5cm x 0.1cm

Mass of the aluminum  = 29.8g

Unknown:

Density  = ?

Solution:

Density of a substance is its mass per unit volume;

  Mathematically;

       Density  = [tex]\frac{mass}{volume}[/tex]

Volume of the aluminum  = 10.5cm x 10.5cm x 0.1cm = 11.025cm³

  So, insert the parameters and solve;

  Density  = [tex]\frac{29.8}{11.025}[/tex]   = 2.7g/cm³

Answer:

moles H = 2 x 0.0649=0.130

ions = 0.130 x 6.02 x 10^23=7.81 x 10^22

Explanation:

Answer:

A. a rotten potato gives all of bad smell

Explanation:

B,C,D are all physical changes because we can reverse them back.we can cool the water back to make ice. if the wind passes again we can randomly get the same cloud shape in c. and in d we can make that statue again. but in A can we reverse the rotting process ? ( the enzyme reaction) no we cant because it is a chemical reaction it gives a bad smell because of the chemical changes occuring in it.

hope this helps

Answer:

The mass number of the atom is equal to the sum of the number of protons and neutrons in the nucleus

Explanation:

Each proton and each neutron weigh one amu( atomic mass unit), adding together the neutrons and protons and multiplying by 1 amu you get the mass of an atom

Answer:

chemichal potential

Explanation:

Answer:

Gravitational Potential

Answer:

There are many ways to figuring this out: you could use a ruler, a calculator or scrap paper.

Explanation:

This is not an actual flat out answer, but it’s helpful methods to getting the answer the next time you are stuck. Hope you are having a nice day. Bless your heart and soul.

Answer:

5

Explanation:

Hey there!

Molar mass of O3 = 47.9982 g/mol

therefore:

1 mole O₃ ---------------------  47.9982 g

moles O₃ ---------------------- 24 g

moles O₃ = 24 x 1 /  47.9982

moles O₃ = 24 / 47.9982

moles O₃ = 0.500 moles

Hope this helps!

Answer:

Explanation:

Ca(OH)₂ is the correct chemical  formula unit of an ionic compound.

Chemical  formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols  of elements. It also makes use of brackets and subscripts.

Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form  is called empirical formula.

It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.

There are four types of chemical formula:

1)empirical formula

2) structural formula

3)condensed formula

4)molecular formula

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Answer:

i think the forces are the same and size and in opposite directions

Explanation:

Answer:

I think it should be

The forces are the same size and in opposite directions

Explanation:

because newtons third law is applied equal force but opposite

Answer:

nonmetel

Explanation:

Answer:

Its a non-metal

Explanation:

Elements that tend to gain electrons to form anions during chemical reactions are called non-metals. These are electronegative elements. They are non-lustrous, brittle and poor conductors of heat and electricity (except graphite). Non-metals can be gaseous, liquids or solids.

N2 + 3 H2 = 2 NH3

Reaction type: synthesis

Answer:

What mass of silver will raise the level of the water in the graduated cylinder 1.50 mL? (Ans) 28.95 g / 1.50 mL = 19.3 g/mL (The gold's density)

19.3 gm/ml³ is the density of gold  .

Density, mass of a unit volume of a material substance. Density of a substance tells how close the particles of a substance are packed.

The formula for density is D = M/V, where d is density, M is mass, and V is volume.

Density is commonly expressed in units of grams per cubic centimeter.

The SI unit of density is kilogram per cubic meter (kg/m3).

It is also represented  in the c g s unit of grams per cubic centimeter (g/cm3).

To calculate density of gold (here):

Given,

Mass of gold=28.95 gm

Volume of water=1.50 mL

Density=?

Density =Mass/Volume

Density=28.95/1.50

Density=19.3 gm/ml³

Hence, 19.3 gm/ml³ is the density of gold .

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The words that complete the blanks are;

1) transverse waves

2) the ground

3) medium

We know that a wave is simply the kind of disturbance that moves along a medium and in the process there is a transfer of energy from one point to another. There are various kinds of waves and the classification of the waves is based on the amount of energy that is transferred in each case.

1) We know that in the case of the light waves, the direction of the wave is perpendicular to the motion of the particle that causes the wave as such we can all it a transverse wave.

2) We know that a wave must always involve an energy that is travelling and in this case, the energy is travelling through the land and this is the ground.

3) We know that the mechanical waves must have to move through a medium of propagation. As such, mechanical waves must move through a medium.

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Answer:

10000000

Explanation:

Use wave equation: c=frequency * wavelength

c=3.00*10^8 m/s

Thus,

[tex]\frac{3.00*10^{8} }{30}[/tex]=10000000

Answer:

4.3043x10^24

Explanation:

Atoms(H) = (3.575 mol H2S/1)(2 mol H/1mol H2S)(6.02x10^23/1molH)

Simple stoicheometry problem. Sorry for taking so long, took Chem sophomore year, its been a while

Answer:

ΔT = 0.843 °C

Explanation:

Given data:

Heat added = 0.484 J

Mass of water = 0.1372 g

Temperature increase = ΔT = ?

Solution:

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

Specific heat capacity of water is 4.184 j/g.°C

Now we will put the values in formula.

0.484 j = 0.1372 g × 4.184 j/g.°C× ΔT

0.484 j = 0.574j/°C× ΔT

ΔT = 0.484 j / 0.574j/°C

ΔT = 0.843 °C

Answer:

B

Explanation:

Answer:

The anser is c

Roman numerals are used to indicate oxidation states. Hence, option C is correct.

An oxidation state is a number given to the atom of an element when participating in a chemical reaction.

Roman numerals are used to indicate oxidation states of transition metals.

The names for transition metal compounds often have roman numerals in them, because the roman numerals indicate the charge on the transition metal. But the oxidation state of Cu in CuO is +2, and the oxidation state of Cu in [tex]Cu_2O[/tex] is +1. Name metal first and charge and transition metal with a roman numeral.

The transition metals may form more than one ion, thus it is needed to be specified which particular ion we are talking about. This is indicated by assigning a Roman numeral after the metal. The Roman numeral denotes the charge and the oxidation state of the transition metal ion.

[tex]Fe^{2+}[/tex] would be named iron (II) and [tex]Fe^{3+}[/tex] would be named iron (III).

Hence, option C is correct.

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Ok thanks for the valuble info.

Answer:

A. They are nonreactive gases

Answer:

The balanced equation is given below:

4Fe + 3O2 —> 2Fe2O3

Explanation:

Fe + O2 —> Fe2O3

The above equation can be balance by doing the following:

Fe + O2 —> Fe2O3

There are 2 atoms of O on the left side and 3 atoms on the right side. It can be balance by putting 3 in front of O2 and 2 in front of Fe2O3 as shown below:

Fe + 3O2 —> 2Fe2O3

There are 4 atoms of Fe on the right side and 1 atom on the left side. It can be balance by putting 4 in front of Fe as follow:

4Fe + 3O2 —> 2Fe2O3

Thus, the equation is balanced