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3 years ago

What conclusion can you make about the skeleton structure of these two organisms

Chemistry

1 answer:

Vanyuwa [196]3 years ago

5 0

They share a common ancestor, but theyre different species

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5.26 grams of Ca atoms to moles.

Evgen [1.6K]

Answer:

0.131 moles.

Explanation:

moles=mass ÷ molar mass

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3 years ago

Nature operates the same way everywhere in the universe except where we have evidence

babunello [35]

Answer:

true

Explanation:

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3 years ago

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A student would like to determine how heating a liquid changes its volume. The student hypothesizes that the liquid will increas

worty [1.4K]

Answer:

The volume of the liquid should be measured before it is heated.

Explanation:

Because During an experiment to test how a variable changes a substance, it is important to first observe and record the characteristics of the substance before the variable is introduced. In this case, the variable is heat energy.

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2 years ago

PLEASE PLEASE HELP!

valentinak56 [21]

Answer: The number of grams of $H_2$ in 1620 mL is 1.44 g

Explanation:

According to ideal gas equation:

$PV=nRT$

P = pressure of gas = 1 atm (at STP)

V = Volume of gas = 1620 ml = 1.62 L (1L=1000ml)

n = number of moles = ?

R = gas constant = $0.0821Latm/Kmol$

T =temperature = $273K$

$n=\frac{PV}{RT}$

$n=\frac{1atm\times 16.2L}{0.0821Latm/K mol\times 273K}=0.72moles$

Mass of hydrogen = $moles\times {\text {Molar mass}}=0.72mol\times 2g/mol=1.44g$

The number of grams of $H_2$ in 1620 mL is 1.44 g

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3 years ago

HELP ASAP

Ghella [55]

potassium reacts the most vigorously.

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3 years ago