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Len [333]
2 years ago
8

(Please help I will give brainliest to whoever answers)Classify each of the following as either an element, compound, mechanical

mixture, solution, colloid or suspension
a. Gold
b. Kool-aid
c. Carbon dioxide
d. Tomato juice
e. Milk
f. Salad
Chemistry
2 answers:
bonufazy [111]2 years ago
7 0

Answer:

element:a,c

compound:f

mechanical mixture

solution:b

colloid:e

suspension:d

Explanation:

elixir [45]2 years ago
3 0

Answer:

I wrote the whole table...

Explanation:

concrete ------Mixture------- Heterogeneous

sugar + pure water -------- Mixture--------- Homogeneous

iron filings (Fe)-------- Pure Substance---------- Element

limestone (CaCO3)-------- Pure Substance-------- Compound

orange juice (w/pulp)------ Mixture---------- Heterogeneous

Pacific Ocean------------- Mixture------------ Heterogeneous

air inside a balloon--------- Mixture------------- Homogeneous

aluminum (Al)---------------- Pure Substance------------ Element

magnesium (Mg)------------- Pure Substance------------- Element

acetylene (C2H2)------------ Pure Substance----------- Compound

tap water in a glass----------- Mixture-------------- Homogeneous

soil-------------- Mixture----------- Heterogeneous

pure water (H2O)---------------- Pure Substance-------------- Compound

chromium (Cr)----------- Pure Substance--------------- Element

Chex mix------------------ Mixture--------------- Heterogeneous

salt + pure water --------- Mixture----------- Homogeneous

benzene (C6H6)----------- Pure Substance----------- Compound

muddy water---------------- Mixture------------- Heterogeneous

brass -------------Mixture----------------- Homogeneous

baking soda------------ Pure Substance--------------- Compound

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Small quantites of hydrogen gas can be prepared in the laboratory by the addition of aqueous hydrochloric acid to metallic zinc.
ira [324]

<u>Answer:</u> The mass or zinc reacted is 0.624 grams.

<u>Explanation:</u>

We are given:

Total pressure = 1.032 atm

Vapor pressure of water = 32 torr = 0.042 atm    (Conversion factor:  1 atm = 760 torr)

To calculate partial pressure of hydrogen gas, we use the equation:

p_{H_2}=p_T-p_{H_2O}\\\\p_{H_2}=1.032-0.042=0.99atm

To calculate the number of moles of hydrogen gas, we use the equation given by ideal gas follows:

PV=nRT

where,

P = pressure of hydrogen gas = 0.99 atm

V = Volume of hydrogen gas = 240. mL = 0.240 L    (Conversion factor: 1 L = 1000 mL)

T = Temperature of hydrogen gas = 30^oC=[30+273]K=303K

R = Gas constant = 0.0821\text{ L. atm }mol^{-1}K^{-1}

n = number of moles of hydrogen gas = ?

Putting values in above equation, we get:

0.99atm\times 0.240L=n\times 0.0821\text{ L atm }mol^{-1}K^{-1}\times 303K\\n=\frac{0.99\times 0.240}{0.0821\times 303}=9.55\times 10^{-3}mol

The chemical equation for the reaction of zinc and hydrochloric acid follows:

Zn+2HCl\rightarrow ZnCl_2+H_2

By Stoichiometry of the reaction:

1 mole of hydrogen gas is produced from 1 mole of zinc metal

So, 9.55\times 10^{-3}mol of hydrogen gas is produced from = \frac{1}{1}\times 9.55\times 10^{-3}=9.55\times 10^{-3}mol of zinc metal

To calculate the mass of zinc metal, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}

Molar mass of zinc = 65.38 g/mol

Moles of zinc = 9.55\times 10^{-3} moles

Putting values in above equation, we get:

9.55\times 10^{-3}mol=\frac{\text{Mass of zinc}}{65.38g/mol}\\\\\text{Mass of zinc}=(9.55\times 10^{-3}mol\times 65.38g/mol)=0.624g

Hence, the mass or zinc reacted is 0.624 grams.

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Explanation:

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KonstantinChe [14]

Answer:  There are 0.5 grams of barium sulfate are present in 250 of 2.0 M BaSO_{4} solution.

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Volume of solution = 250 mL

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1 mL = 0.001 L\\250 mL = 250 mL \times \frac{0.001 L}{1 mL}\\= 0.25 L

Molarity is the number of moles of solute present in liter of solution. Hence, molarity of the given BaSO_{4} solution is as follows.

Molarity = \frac{mass}{Volume (in L)}\\2.0 M = \frac{mass}{0.25 L}\\mass = 0.5 g

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