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2 years ago

Based on the fossil records, what is true

Chemistry

1 answer:

soldier1979 [14.2K]2 years ago

8 0

Answer:

Explanation:

The reason why is beacause most of the dino's and other spices that were here before humanity are exctinct. Some are still alive and have evovled into something greater such as a crocidile, and many other repitlians

Hope this helps!

Pls mark brainlest!

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How many sulfur atoms are there in 21.0 g of al2s3?

ValentinkaMS [17]

Given the mass of aluminum sulfide $Al_{2}S_{3}$ = 21.0 g

Molar mass of $Al_{2}S_{3}$ = $2 * Molar mass of Al + 3 *molar mass of S = 2(27g/mol)+3(32.g/mol)=150.g/mol$

Calculating the moles of $Al_{2}S_{3}$ :

$21.0 g *\frac{1 mol}{150 g} = 0.14 mol Al_{2}S_{3}$

Each mole $Al_{2}S_{3}$ has 3 mol S.

Each mole S constitutes $6.022*10^{23} atoms of S$

Calculating atoms of S in 0.14 mol $Al_{2}S_{3}$ :

$0.14 mol Al_{2}S_{3} *\frac{3mol S}{1 mol Al_{2}S_{3} }*\frac{6.022*10^{23}atoms S }{1 mol S}$

= $2.53 * 10^{23} atoms of S$

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3 years ago

Using what you have learned about magnetic forces, potential and kinetic energy. Describe the changes

weeeeeb [17]

Answer:

reversible reaction or covalent bonds

7 0

2 years ago

Who made the first periodic table

ale4655 [162]

The other dude is rude wrong

The correct answer is Dmitri Mendeleev

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2 years ago

Hii!! need help with this last answer for chem. would appreciate the help. (question 3)

avanturin [10]

Answer:

1.023 J / g°C

Explanation:

Mass, m = 37.9 g

Temperature increase (change) = 25.0°C

Heat = 969 J

Specific heat capacity , c= ?

The relationship between these quantities is given by the equation;

H = mcΔT

c = H / mΔT

c = 969 / (37.9 * 25)

c = 969 / 947.5 = 1.023 J / g°C

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3 years ago

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Inessa05 [86]

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2 years ago