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3 years ago

Which factors may contribute to the extinction of a species? Check all that apply.

Chemistry

2 answers:

Genrish500 [490]3 years ago

8 0

Answer:

Explanation:

Dovator [93]3 years ago

8 0

Answer:

_more individuals fighting over the same resources

_the loss of the environment in which an organism’s needs are met

_the introduction of new predators into an area

Explanation:

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CH3CH2OH is an organic compound that is soluble in water. What type of compound is this?

shepuryov [24]

Answer:

Ethanol

Explanation:

CH3CH2OH is Ethanol

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2 years ago

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A pH scale has how many sections on it?

leva [86]

Answer:

0-14

Explanation:

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2 years ago

A certain substance X has a normal freezing point of -6.4 C and a molal freezing point depression constant Kf= 3.96 degrees C.kg

Brut [27]

Answer: $1.0\times 10^2g$

Explanation:

Depression in freezing point is given by:

$\Delta T_f=i\times K_f\times m$

$\Delta T_f=T_f^0-T_f=(-6.4-(13.6))^0C=7.2^0C$ = Depression in freezing point

i= vant hoff factor = 1 (for non electrolyte like urea)

$K_f$ = freezing point constant = $3.96^0C/m$

m= molality

$\Delta T_f=i\times K_f\times \frac{\text{mass of solute}}{\text{molar mass of solute}}\times \text{weight of solvent in kg}}$

Weight of solvent (X)= 950 g = 0.95 kg

Molar mass of non electrolyte (urea) = 60.06 g/mol

Mass of non electrolyte (urea) added = ?

$7.2=1\times 3.96\times \frac{xg}{60.06 g/mol\times 0.95kg}$

$x=1.0\times 10^2g$

Thus $1.0\times 10^2g$ urea was dissolved.

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3 years ago

A solution in a dish contains 4.0 grams of salt dissolved in 100 grams of water. If 50 grams of the water evaporates, this is ev

MaRussiya [10]

D. A mixture

If the water is evaporating while the salt remains, it means the two are not chemically bonded and therefore are not a compound.

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3 years ago

How many is too many

Rufina [12.5K]

Answer:

to manyneh nrjwsj

Explanation:

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2 years ago