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gladu [14]
3 years ago
9

The eastern coast of South America and the western coast of Africa are separated by the Atlantic Ocean. If scientists find the s

ame types of plant fossils on the eastern coast of South America and the western coast of Africa, which of these would be the best conclusion?
A.
The oceans were formed after dinosaurs went extinct.
B.
The climate in each continent has changed.
C.
Dinosaurs once lived in both of these regions.
D.
At one time, the two continents were one landmass.
Chemistry
1 answer:
sergey [27]3 years ago
7 0

Answer:

At one time the two continents were one landmass

Explanation:

If scientists find the same types of plant fossils on the eastern coast of South America and the western coast of Africa, this suggests that at one time, the two continents were one landmass. When the continents separated, the communities of plants were split, resulting in identical fossils on each coast millions of years later.

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A scientist made careful measurements of the pressure and temperature of many different gases. Based on these measurements, he c
alex41 [277]

Answer:

c. law

Explanation:

Law -

It is type of statement , which helps to explain certain observations , in the form of mathematical relationship or verbal statements , is referred as a law .

Law is a widely accepted information , which can get altered by some new inventions or exception.

A law is stated in words as well as in the form of some mathematical relationships or equations.

Hence , from the given information of the question,

The correct option is c. law .

4 0
3 years ago
By what quantity must the heat capacity be divided to obtain the specific heat of that material
masha68 [24]
<span>Heat capacity of an object, is the amount of heat energy or thermal energy (unit: Joule) needed to raise the temperature of the object by 1 degree celsius. Unit of heat capacity is J/°C 

Larger object will surely need larger amount of thermal energy to raise its temperature. If you compare 1 litre of water with 0.5 litre of water, the 1L water will have two times the heat capacity. 

It will be more useful to compare specific heat capacity, because then it is the amount of heat energy or thermal energy (unit: Joule) needed to raise the temperature of 1 unit mass of the object by 1 degree celsius. You can then compare between 1 unit mass of water and 1 unit mass of iron. 
Water has higher specific heat capacity than iron, meaning that you need more energy to heat up 1kg of water, then to heat up 1kg of iron. 

The unit will then be J/(kg °C) or J/(g °C).
</span>
6 0
3 years ago
Gaseous methane ch4 will react with gaseous oxygen o2 to produce gaseous carbon dioxide co2 and gaseous water h2o . suppose 1.44
Usimov [2.4K]
The balanced equation for the above reaction is;
CH₄ + 2O₂ ---> CO₂ + 2H₂O
Stoichiometry of CH₄ to O₂ is 1:2
The number of methane moles present - 1.44 g/ 16 g/mol = 0.090 mol
Number of oxygen moles present - 9.5 g/ 32 g/mol = 0.30 mol
If methane is the limiting reagent,
0.090 moles of methane react with 0.090x 2 = 0.180 mol 
only 0.180 mol of O₂ is required but 0.30 mol of O₂ has been provided therefore O₂ is in excess and CH₄ is the limiting reactant.
Number of moles of water that can be produced - 0.180 mol
Therefore mass of water produced - 0.180 x 18 g/mol = 3.24 g 
Therefore mass of 3.24 g of water can be produced 
6 0
3 years ago
Read 2 more answers
The smallest unit of an organism is
jek_recluse [69]

Answer:

Explanation:

cell is the basic smallest,functional  and structural unit of an organism

4 0
3 years ago
Which of the following compounds will make an electrolytic solution?
Novosadov [1.4K]

Answer: KBr will make an electrolytic solution

Explanation:

Electrolyte is a substance which dissociates into ions when dissolved in water and thus is able to conduct electric current through them.

Compounds in solid form does not conduct electricity due to the absence of free ions.

a) SO_2 is a covalent compound and thus not an electrolyte.

b) C_2H_5OH  is a covalent compound and thus do not dissolve in water and thus is not an electrolyte.

c) KBr  is an ionic compound and thus dissolve in water and give ions which help to conduct electricity.

KBr\rightarrrow K^++Br^-

d) CCl_4  is a covalent compound and thus do not dissolve in water and thus is not an electrolyte.

7 0
3 years ago
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