20 Infer Check the box to show which would tell you for sure if you had a sample of real gold.
Color of your sample. Yes No
What happens when you strike your sample with a hammer.
The location where your sample was found.

Answer:

1/8th = 12.5%

Explanation:

Three half lives would be   1/2 * 1/2 * 1/2 = 1/8 th of original

A substance that has a pH value of 14 is a strong base because pH 8 to 14 represents base.

The pH value 1 to 6 indicates acidic, 7 shows neutral whereas pH from 8 to 14 shows basic nature. pH 1 shows strong acid which becomes weak when it goes to 6 while on the other hand, pH 8 is a weak base which increases when it reaches to 14.

So we can conclude that a substance that has a pH value of 14 is a strong base because pH 8 to 14 represents base.

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Answer:

C. It is a strong base

Explanation:

pH 1 to 6 is acid (weaker)

pH 7 is neutral

pH 6 to 14 is base (stronger)  

Answer:

Hello there! I believe the answer you need is d= M/V. Have a good day,night or miday. Sorry if I'm wrong.

#a

#b

#c

This is reversible reaction

Radioactive decay of a nucleus is common in nuclei that are heavy

A radioactive nucleus is a nucleus that decays by spontaneous disintegration. It is common in Many nuclei that have  atomic number above 82.

Hence, radioactive decay of a nucleus is common in nuclei that are heavy and are capable of breaking apart.

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1 mole of any gas at standard temperature and pressure (273 K and 1 atm) occupies a volume of 22.4 L.

Answer:

1.94 Moles H2O

Explanation:

1 grams Water to mol = 0.05551 mol

so 35 x 0.05551 = 1.9427952271627198, which rounds to 1.94 moles

The moles of phosphorous which are present in 750 grams of phosphorous is 24.27 moles.

Relation between the mass and moles of any substance will be represented as:

Moles of phosphorous which are present in 750 grams will be calculated as:

n = 750g / 30.9g/mol = 24.27 moles

Hence the resultant moles of phosphorous is 24.27 moles.

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Answer:

Increases by 100 Pa

Explanation:

According to The Ideal Gas Equation,

35.5 g of tetrachloroethane is added if 15 grams of chlorine is used with excess [tex]C_2H_2[/tex].

A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge is  the same for both the reactants and the products.

Balanced chemical equation:

[tex]2Cl_2 (g) + C_2H_2 (g)[/tex] → [tex]C_2H_2Cl_4(l)[/tex]

In your case, 2 moles of chlorine gas are needed to produce 1 mole of tetrachloroethane, which implies that there's a 2:1 mole ratio between the two.

Calculating the mass of tetrachloroethane.

[tex]m[/tex][tex]C_2H_2Cl_4(l)[/tex] = [tex]15 g[/tex] [tex]Cl_2 (g)[/tex] X [tex]\frac{2 mol \;of \;Cl_2}{70 g \;Cl_2}[/tex] X [tex]\frac{1 mol \;of \;C_2H_2Cl_4(l)}{2 mol \;Cl_2}[/tex] X [tex]\frac{167.8 g \;C_2H_2Cl_4(l))}{1 mol \;C_2H_2Cl_4}[/tex]

[tex]C_2H_2Cl_4(l)[/tex] = [tex]17.75 g[/tex]

[tex]C_2H_2Cl_4(l)[/tex] = [tex]35.5 g[/tex]

Hence, 35.5 g of tetrachloroethane is added if 15 gram of chlorine is used with excess [tex]C_2H_2[/tex]

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When servers break state, county, or municipal alcohol laws when serving alcohol, the server could be fined and the establishment could lose its liquor license.

This is defined as governmentally issued permit for the service of alcohol in an area over a period of time.

When alcohol law is broken, there may be a fine or the revoking of the liquor license.

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#b

According to Le C ha.te llors principle of we increase concentration of reactants or products equilibrium shifts.

#c

#e

Stated in b

Answer:

its true hope this helped :)

A chemist needs 32.0 g of phenol, for an experiment. The number of moles of phenol is 0.340 mol.

The mole is a SI unit of measurement that is used to calculate the quantity of any substance.

Calculating the moles

[tex]\rm Number\;of \;moles= \dfrac{mass}{molar\;mass}\\\\\rm Number\;of \;moles= \dfrac{32.0}{94.11} = 0.340 moles[/tex]

The molar mass can be calculated by counting the molecules of the elements. Then multiply the molecules of each element with its molar mass and then add the total number, you'll get the molar mass of the compound.

Thus, the number of moles of phenol is 0.340 mol.

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Answer:

Warming it would make it come out. On a cold day the honey is frozen and atoms will not move as fast and are close toghether. When you warm it the atoms will move faster and the honey will come out of the bottle

Explanation:

Answer:

24 oral syringes

Explanation:

Explanation:

[tex]molar \: mass(mg) = 24g. {mol}^{ - 1} mass = 24.3g \\ molar \: mass(h20) = 18g. {mol}^{ - 1} mass = 12g \\ n = \frac{mass}{molar \: mass} \\ n(mg) = 1.01mol wich \: is \: substance \: a\\ n(h2o) = 0.67mol \: which \: is \: substance \: b \\ \frac{ |n|a }{ |n|b } : \frac{a}{b} \\ \frac{1.01}{0.67}: \frac{1}{2} \\ 1.51 > 0.50 \\ therefore \: substnce \: b \: which \: is \: water \: steam \: is \: limiting \: reagent [/tex]

Answer:

scientific literacy provide essential tools for surviving in the news jungle and for responsible citizenship. They also teach us to understand our own actions, to review them critically, and to take care of our rights. This is why science education is important

Explanation:

Answer:

P2=672.1 torr

Explanation:

use the formula P1V1=P2V2, plug in the numbers so your equation should look like this (763.9)x(98.8)=P2(112.3) answer should be P2=672.1 torr

The resultant pressure of the sample of gas is 510.9 torr.

Relation between the pressure and volume will be represented by the ideal gas equation PV = nRT, and for the given question required equation is:

P₁V₁ = P₂V₂, where

P₁ & V₁ are the pressure and volume of initial sample.

P₂ & V₂ are the pressure and volume of final sample.

On putting values from the question to the equation, we get

P₂ = (768.6)(93.2) / (140.2) = 510.9 torr

Hence resultant pressure is 510.9 torr.

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The specific heat of a substance if a mass of 10.0 kg increases in temperature from 10.0°C to 70.0°C when 2,520 J of heat is applied is 4.2 J/g°C.

The specific heat capacity of a substance can be calculated using the following formula:

Q = m × c × ∆T

Where;

2520 = 10 × c × (70 - 10)

2520 = 600c

c = 4.2 J/g°C

Therefore, the specific heat of a substance if a mass of 10.0 kg increases in temperature from 10.0°C to 70.0°C when 2,520 J of heat is applied is 4.2 J/g°C.

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Answer:

A

Explanation:

Answer:

because they possess the same number of electron at their outermost shell

Answer:

Because vanilla Ice cream contains vastly more milk, sugar, etc. Then vanilla extract. It only takes a very small amount in comparison to adding that flavor.

Explanation:

I hope this helps girl

Why is vanilla ice cream white instead of brown?

It is true that Vanilla beans are brown in color and it is interesting that with this brown color ingredient, Vanilla Ice Cream is still white. Well, the vast majority of vanilla flavoring comes in the form of extract. Vanilla beans are very expensive and pure Vanilla has great flavor. When Ice Cream is made, the Vanilla we put in the Ice Cream is very insignificant quantity when compared to the milk powder, sugar, and cream that goes into the Ice Cream. Due to the whipping and procedure of the making, the brown color of Vanilla is lost amongst the huge quantities of other ingredients and we get milky white yummy Vanilla Ice cream

Answer:

2 H2O(g) + O2(g)

2 O-1 → O20 + 2 e- 4.

Explanation:

Essentially elephant's toothpaste is just the decomposition of H2O2, hydrogen peroxide. It's catalyzed by KMnO4

Balanced Equation: [tex]2H_2O_2 \ -- > \ 2H_2O \ + \ O_2_[/tex]

Unbalanced Equation: [tex]H_2O_2 \ -- > \ H_2O \ + \ O_2[/tex]

Answer:

Oxygen

Explanation:

One mole of atoms of oxygen has a mass of 16 g, as 16 is the atomic weight of oxygen, and contains 6.02 X 1023 atoms of oxygen.

When 45.0 mL of a 1.90 M H₂SO₄ solution is added to 95.0 mL of 0.600 M H₂SO₄the molarity of the resulting solution is 0.95 M.

To answer the question, we need to know what molarity is.

Molarity is the number of moles per unit volume with volume in liters.

To find the molarity of the resulting solution, we need to find the number of moles in each solution.

Number of moles, n = MV where

Given that we have 45.0 mL of a 1.90 M H₂SO₄ solution.

M' = 1.90 M and V' = 45.0 mL = 0.045 L

So, n' = M'V'

= 1.90 M × 0.045 L

= 0.0855 mol

Given that we have 95.0 mL of 0.600 M H₂SO₄ solution.

M" = 0.600 M and V" = 95.0 mL = 0.095 L

So, n" = M"V"

= 0.600 M × 0.095 L

= 0.057 mol

The number of moles in the resulting solution is n'" = n' + n"

= 0.0855 mol + 0.057 mol

= 0.1425 mol

The volume of the resulting solution is V"' = V' + V"

= 45.0 mL + 95.0 mL

= 150.0 mL

= 0.15 L

The molarity of the resulting solution is M'" = n"'/V"'

= 0.1425 mol/0.15 L

= 0.95 mol/L

= 0.95 M

So, the molarity of the resulting solution is 0.95 M.

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Answer:

Answer below

Explanation:

Physical changes dont change the chemical makeup of an object. An example would be to tear a piece of paper. Tearing the paper doesnt change how the paper was made chemically

Chemical changes on the other hand do change the chemical makeup of an object. An example of a chemical change would be to bake a cake. The reason being that the chemical makeup of the cake batter is changed so that the actual cake is formed.