The density of aluminum is 2.7 g/cm3. A metal sample has a mass of 52.0 grams and a volume of 17.1 cubic centimeters. Could the sample be aluminum? EXPLAIN your answer.

Explanation:

Answer:

True

Explanation:

A homogeneous mixture is simply any mixture that is uniform in composition throughout. As long as each substance is mixed in enough to be indistinguishable from the others, it is a homogeneous mixture.

Answer:

B. 8

Explanation:

Answer:

T = 50.83°C

Explanation:

Let the final temperature be T .

heat lost = mass x specific heat x fall in temperature

heat lost by iron = 20 x .444 x ( 55.6 - T )

heat gained  by gold  = 10 x .129 x ( T- 18 )

heat lost = heat gained

20 x .444 x ( 55.6 - T ) = 10 x .129 x ( T- 18 )

493.73 - 8.88 T = 1.29 T - 23.22

10.17 T = 516.95

T = 50.83°C

The final temperature of the combined metals (gold and iron) is 50.83°C.

Given the following data:

To find the final temperature of the combined metals (gold and iron):

Heat lost by the iron = Heat gained by the gold.

[tex]Q_{lost} = Q_{gained}\\\\mc\theta = mc\theta\\\\20(0.444)(55.6 - T_f) = 10(0.129)(T_f - 18)\\\\8.88(55.6 - T_f) = 1.29(T_f - 18)\\\\493.728 - 8.88T_f = 1.29T_f - 23.22\\\\8.88T_f + 1.29T_f = 493.728 + 23.22\\\\10.17T_f = 516.948\\\\T_f = \frac{516.948}{10.17}[/tex]

Final temperature = 50.83°C

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Answer:

Human activities are at the root of this phenomenon.

Explanation:

Answer:

bubbled

Explanation:

its simple they bubbled

signs of chemical reactions are change of

odor

bubbles

solid turns liquid

liquid turns solid

change of color

Answer:

Describe electrons.

Location: electron cloud

Charge: negative

Mass: one-two thousands amu

Explanation:

Answer:

Cobalt (II) Carbonate

Explanation:

Answer:B

Explanation:

Answer:

Argon

Explanation:

The element that would most likely be a good substitute for neon is "argon".

These two elements belong to the noble gases in Group 18(8A) of the Periodic Table. They are inert gases - they do not react chemically with other substances.

Argon, as an inert gas is often used whenever an inert atmosphere is needed. Argon is used in incandescent light bulbs. It is used to stop oxygen from corroding the filament. It is also used by welders to protect weld area.

Argon is a good substitute for neon in this context because they possess some physical properties which are similar.

Answer:

[tex]Cl^-[/tex]

Explanation:

Hello.

In this case, when chlorine gets ionized by gaining one electron it goes:

[tex]Cl^-[/tex]

Whose electron configuration is the same as argon:

[tex]Cl^-=Ar:1s^2,2s^2,2p^2,3s^2,3p^6[/tex]

Since the both of them have 18 electrons, they become isoelectric with the same neutral charge.

Best regards.

Answer:

~26 atoms of sulfur

Explanation:

When working problems involving equations I find it helpful to works through moles because it relates to the coefficients of balanced equation by linear ratio. In other words, convert data to moles, solve by ratio and convert results to desired dimensions. In this case Atoms of Sulfur.

Given: 52 atoms K = 52 atoms/6.02 x 10²³atoms K/mole K = 9.64 x 10⁻²³ mole K atoms.

Using ratios in given equation 4K + 2S => 2K₂S

Says

       4           moles K reacts with 2 moles Sulfur, then

 8.64 x 10⁻²³ mole K reacts with X moles Sulfur

Set up ratio:

(4 moles K) / (8.64 x 10⁻²³ moles K) = (2 moles S) / X

Solve for X => X = (2 moles S x 8.64 x 10⁻²³ mole K) /  4 mole K = 4.32 x 10⁻²³ mole S used

Converting moles S to atoms S, multiply by Avogadro's Number ...

Atoms S used = 4.32 x 10⁻²³ mole S used x 6.02 x 10²³ Atoms S / mole S

=> 26.0064 Atoms S  ≈ 26 Atoms Sulfur used.

Note: This is a reasonable answer in that the balanced equation given indicates that half the number moles S reacts with K. So, one can conclude that half the number of potassium atoms would indicate the number of sulfur atoms needed. test => ¹/₂(52) = 26 atoms S.

Answer:

D

Explanation:

Because a metal must reactive and able to conduct

Answer:

B.Conductivity and ductility

Explanation.

Some metals are conductive and are ductile

Conductivity is the ability to have an electric flow

Ductility is the ability to bend

Answer:

C. Heredity

Explanation:

Homeostasis means that an organism can control its own body temperature. This is important because if we couldn't control our temperature, then our cells would have trouble working properly from being to hot or cold.

Cell organization means that our body and cells can organize themselves into groups that work together. For example, cells form groups and tissue for different organs while other cells form nerves.

Heredity is the passing of genes from parent to offspring

Answer:

1 molecule = 40.00 grams

1.52 molecules = 1.52*40.00

                         = 60.8 grams

Answer:

The purpose of the Parados is to add an explanation of events that happened before the play begins. In the first section the mood is triumphant because of the recent battle win. Then it jumps back to the beginning of the battle and the mood is scared. Before the army lead by the brother of the king could attack they are forced to retreat and the army counterattacks. Unfortunately, the brothers kill each other during the battle. The people of Ancient Greece believed that Zeus and Ares were on their side and used the gods as the excuse for winning a battle. The story ends victorious but sad tone because the two brothers have slain each other.

Explanation: Gets you 100%

Answer:

Sediment increases the cost of treating drinking water and can result in odor and taste problems. Sediment can clog fish gills, reducing resistence to disease, lowering growth rates, and affecting fish egg and larvae development.

Explanation:

Answer:

"Sediment increases the cost of treating drinking water and can result in odor and taste problems. Sediment can clog fish gills, reducing resistance to disease, lowering growth rates, and affecting fish egg and larvae development".

Explanation:

Answer:

which statements

Explanation:

Answer:

The positive charge of the protons in the nucleus equals the negative charge in the electron cloud.

Explanation:

I just took the assignment.

Answer:

The corresponding wavelength is 2.4×10⁻³⁴ m.

Explanation:

Given data:

Mass of ball = 45.9 g  (45.9/1000 = 0.0459 kg)

Speed of ball = 61.0 m/s

Wavelength = ?

Solution:

Formula:

λ = h/mv

λ = wavelength

h = Planck's constant

m = mass

v = velocity

Now we will put the values in formula.

λ = 6.63×10⁻³⁴ kg.m².s⁻¹ / 0.0459 kg ×61.0 m/s

λ = 6.63×10⁻³⁴kg.m².s⁻¹ /2.8 Kg.m/s

λ = 2.4×10⁻³⁴ m

The corresponding wavelength is 2.4×10⁻³⁴ m.

Answer:

See explanation

Explanation:

Carboxylic acids are all soluble in solutions of NaOH, Na2CO3 and NaHCO3 due to the formation of a sodium salt of the acid.

In all these cases, the sodium salt of cyclohexanecarboxylicacid formed is more soluble in water than the parent acid.

When the acid is dissolved in sodium bicarbonate or sodium carbonate, carbon dioxide gas is also evolved.

Answer:

Explanation:

Answer:

143 N

Explanation:

Answer:

Explanation:

The density of a substance can be found by using the formula

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

From the question

mass = 10 g

volume = 2 mL

We have

[tex]density = \frac{10}{2} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

5.0 g/mL

Explanation:

Answer:

112.5

Explanation:

I think so because in one unit has 4 oxygen atoms.

Answer:

1.8×10²² atom of Rn contain 0.03 moles of Rn.

Explanation:

Given data:

Number of atoms of Rn = 1.8×10²² atoms

Number of moles = ?

Solution:

we will solve this problem through Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

For example,

1 mole of Rn = 6.022 × 10²³ atoms of Rn

1.8×10²² atoms of Rn × 1mol /  6.022 × 10²³ atoms of Rn

0.3×10⁻¹ moles of Rn

0.03 moles of Rn