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3 years ago

12

Which of the following is an example of chemical change? A.) stirring butter and sugar together B.) adding food coloring to wate

r C.) burning a candle D.) breaking a rock into smaller pieces

1 answer:

blondinia [14]3 years ago

5 0

The answer is A. Because when stirring butter and sugar together it makes a odor and odor always involves a chemical change.

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How many total phosphorus atoms are shown in the following: Al2P3? *

Wewaii [24]

Answer:

3 P atoms

Explanation:

Al₂P₃ => contains 2 Aluminum ions (2Al⁺³) and 3 Phosphide ions (3P⁻³) ... The ions (charged particles) are from atoms that have lost or gained electrons during the bonding process. So, Al₂P₃ => P⁻³ ions from 3 P atoms.

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4 years ago

What is the name of the compound PbS2 • 4H2O?

Ainat [17]

Should be :

Lead Sulfate Tetrahydrate

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3 years ago

What is the pH of [H+]=0.0000000035 and is it acidic, basic, or neutral?

natima [27]

Answer:

The pH is 8,45 and it is basic.

Explanation:

The pH is a measure that gives us an idea of the acidity or alkalinity of a solution. It is calculated as:

pH = -log (H +)= -log (0.0000000035)=8, 46

The pH scale ranges from values of 0 to 14 (less than 7.0 is acidic and greater than 7.0 is basic, a pH = 7.0 is neutral).

In this case, the solution is basic (value greater than 7.0 ).

8 0

3 years ago

GUYS I NEED HELP MY QUIZ SUBMITS IN 10 MINUTES CHEMISTRY HALF LIFE

Ivahew [28]

12.5%

Three half lives pass. 50% -> 25% -> 12.5%

3 0

3 years ago

The zinc within a copper-plated penny will dissolve in hydrochloric acid if the copper coating is filed down in several spots (s

Mrac [35]

Answer:

Mass of hydrogen gas evolved is 0.0749 grams.

Explanation:

Total pressure of the gases = p = 758 mmHg

Vapor pressure of water = 23.78 mmHg

Pressure of hydrogen gas ,P = p - 23.78 mmHg = 758 mmHg - 23.78 mmHg

P = 734.22 mmHg = $\frac{734.22}{760} atm=0.966 atm$

Temperature of of hydrogen gas ,T= 25°C =298.15 K

Volume of hydrogen gas = V = 0.949 L

Moles of hydrogen gas =n

PV = nRT (Ideal gas equation )

$n=\frac{PV}{RT}=\frac{0.966 atm\times 0.949 L}{0.0821 atm L/mol K\times 298.15 K}$

n = 0.03745 mol

Moles of hydrogen gas = 0.03745 mol

Mass of 0.03745 moles of hydrogen gas = 0.03745 mol × 2 g/mol = 0.0749 g

Mass of hydrogen gas evolved is 0.0749 grams.

3 0

4 years ago