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4 years ago

Which of the following is a ectothermic vertebrate a. butterfly b. lizard c. eagle d. dog

Chemistry

2 answers:

prohojiy [21]4 years ago

8 0

Lizard. Any cold-blooded species is ectothermic.

azamat4 years ago

5 0

Lizards because anything cold blooded is a ectothermic vertibrate

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You buy butter $3.31 a pound one portion of onion compote requires 1.7 oz of butter how much does the butter for one portion cos

Lorico [155]

Answer:

The butter for one portion cost is $0.35.

Explanation:

5 0

3 years ago

A fossilized bone contains about 65% of its original carbon-14. to the nearest hundred years, how old is the bone

Assoli18 [71]

3600 years.
Since 65% of the carbon-14 is remaining, we need to get the logarithm to base 2 of 0.65 to determine how many half lives have expired. So: log(0.65)/log(2) = -0.187086643/0.301029996 = -0.621488377
So we know that 0.621488377 half-lives has gone by to the bone sample. Now we just need to multiply by the half-life of carbon-14 which is 5730 years. So: 0.621488377 * 5730 = 3561.128399 years.  Rounding to the nearest 100 years gives us 3600 years.

7 0

3 years ago

A helium balloon contains 0.40 g of helium. given the molecular weight of helium is 4.0 g/mol, how many moles of helium does it

Rasek [7]

Answer is 0.10 mol.

Explanation;

n = m/M

Where n is number of moles (mol), m is the mass of substance (g) and M is the molar mass of the substance (g/mol).

n = ?

m = 0.40 g

M = 4.0 g/mol

From substitution,

n = 0.40 g /4.0 g/mol

n = 0.10 mol

Hence, the balloon has 0.10 mol of He.

8 0

3 years ago

An unknown acid was titrated two times with 0.10 M NaOH. The first titration was done using an indicator to determine the equiva

Anit [1.1K]

Answer:

hello your question is incomplete attached below is the complete question

a) 0.12 M

b) Ka = 3.0 * 10^-7

c) Alizarin Yellow R

Explanation:

A) Determine the concentration of the unknown acid

The PH of the unknown acid before addition of NaOH is ; 3.72 ( weak acid )

First determine the moles of of NaOH

= molarity * volume

= 0.10 M * 30.0 ML = 0.0030 mol

at equivalence point

moles of NaOH = moles of unknown acid = 0.0030 mol

volume of unknown acid = 25.0 mL

Next calculate the concentration of the Acid ( HA )

= moles / volume

= 0.0030 mol / 25.0 mL

= 0.12 M

b) Determine the Ka of the unknown acid

attached below is the detailed solution

Ka = 3.0 * 10^-7

c) The indicator that would be a good choice to use in the titration of this acid with NaOH is ; Alizarin Yellow R . this is because the titration is between a strong base and a weak acid.

7 0

3 years ago

The particles that make up matter do not change during a ?

Bogdan [553]

Matter can only me transformed, but not created or destroyed.

8 0

4 years ago

Read 2 more answers