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algol13
3 years ago
5

Tracy observes an organism that lives in a lake by her house. The organism has an internal skeleton, scales, fins, and gills. Th

e organism that Tracy observes is most likely a(n) _______. A. amphibian B. fish C. mammal D. reptile
Chemistry
2 answers:
andrey2020 [161]3 years ago
8 0
I'd say B. Its most likely a fish.
a_sh-v [17]3 years ago
5 0
The answer would be B. fish, because a fish is the only selection that has fins.
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You are given an unknown gaseous binary compound (that is, a compound consisting of two different elements). when 10.0 g of the
Luda [366]

Answer is: a possible identity for the unknown compound is C₃H₈.

m(binary compound) = 10.0 g.

m(H₂O) = 16.3 g; mass of water.

M(O₂) = 32 g/mol; molar mass of oxygen.

M(binary compound) = 1.38 · 32 g/mol.

M(binary compound) = 44.16 g/mol.

n(binary compound) = 10 g ÷ 44.16 g/mol.

n(binary compound) = 0.225 mol; amount of substance.

n(H₂O) = 16.3 g ÷ 18 g/mol.

n(H₂O) = 0.9 mol; amount of water.

m(H₂O) : n(binary compound) = 0.9 mol ÷ 0.225 mol.

m(H₂O) : n(binary compound) = 4 : 1.

Unknown cpmpound has 4 times more hydrogen than water, it has 8 hydrogen atoms.

Second element in compound is carbon:

M(X) = 44.16 g/mol - 8 · 1.01 g/mol.

M(X) = 36.08 g/mol ÷ 3.

M(C) = 12.01 g/mol.

8 0
3 years ago
Identify 3 physical changes that could occur with a sheet of paper
VladimirAG [237]

Answer:

  • 1. Dimensions: The sheet can be cut into several smaller pieces.

  • 2. Shape: the sheet can be formed into a paper ball or any other shape (using origami for example).

  • 3. Color: You can use crayons to paint the sheet and change its color.

Explanation:

<em>Physical changes</em> do not change the chemical properties. They do not transform the compounds that form the substances. They do not break and or form chemical bonds.

When you change the form, the state (solid, liquid or gas), the color, you are just changing physical properties.

Only chemical changes change the compounds that form the substance. For instance, if you burn the <em>sheet of paper</em>, then you are causing a chemical change because the organic matter in the paper will react with oxygen forming CO₂ and water, but by cutting, folding, smashing, or coloring with crayons, the compounds in the<em> sheet of paper</em> do not change.

6 0
3 years ago
Which of the following is the correct nuclei definition for an ion with 26 protons, 30 neutrons, and 23 electrons
lyudmila [28]

Answer:

30

Explanation:

<em>bobo</em>

4 0
3 years ago
if you have an isotope of the element carbon that has the mass number of 14, what other information would help you determine the
storchak [24]
Isotopes are forms of the same elements which contain equal number of protons but different number of nucleus in their nuclei, thus the differ in relative atomic mass but they have same chemical properties. The mass number is the summation of number of proton and number of neutron of an atom. If the mass number is known, then one need to know the number of proton in the atom in order to calculate for the number of neutron.
7 0
3 years ago
Im doing a science fair project and i need to find out what are the constents in my project i have to presnt tomorrow i need hel
lions [1.4K]
The constents would be anythign that stays the same in ever experiment. 

Example:  Growing sunflowers in different liquids 

The constants could be: Type of dirt used to grow each, amount of liquid used to water, and the type of sunflowers grown. 


4 0
3 years ago
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