1 year ago

True or false: In a combustion reaction, matter is destroyed.

2 answers:

7 0

FALSE.

EXPLANATION: According to law of conservation of mass (which states that mass is never created nor destroyed in chemical reactions), matter can't be destroyed in these reactions.

sp2606 [1]1 year ago

6 0

Matter is never destroyed, nor created. So, this is false.

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valentina_108 [34]

Answer:

$1.2*10^{-2} g$

Explanation:

$1 mol - 6*10^{23} particles$

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$44\frac{g}{mol} *0.00026578 mol =0.012 = 1.2*10^{-2} g$

8 0

2 years ago

A cylinder container can hold 2.45 L of water. It’s radius is 4.00 cm. What is the volume of it in cubic centimeters?

tatuchka [14]

Answer:

2450 cm3

Explanation:

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7 0

2 years ago

Scientists determine that the wooden beams of a sunken ship have 67 % of the concentration of Carbon-14 that is found in the lea

DerKrebs [107]

Answer:

The age of ship is 1900 years.

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The half life period of carbon - 14 is 5730 years

Ship have 67 % of the concentration of Carbon-14

And the ship lost (100- 67 = 33%) 33% of carbon - 14.

Therefore,

The age of ship = lost percentage X half life period of carbon -14

$= 33 \times 5730 yrs = 1890.9yrs\equiv 1900\,years$

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3 0

2 years ago

The density of gold is 19.32. Give two reasons why this statement is incomplete

DerKrebs [107]

A: there is no unit. b: it doesn't present the temperature and pressure

3 0

2 years ago

Read 2 more answers

A gem has a mass of 4.50 g. When the gem is placed in a graduated cylinder 12.00 mL of water, the water level rises to 13.45 mL.

Mandarinka [93]

Displaced volume :

Final volume - Initial volume

13.45 mL - 12.00 mL => 1.45 mL

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Therefore:

density = mass / volume

D = 4.50 / 1.45

D = 3.103 g/mL

6 0

1 year ago