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3 years ago

What must models and theories do in order to remain valid? Provide 2 facts.

Chemistry

2 answers:

Sunny_sXe [5.5K]3 years ago

8 0

Answer:

1. Models and theories should explain known fact.

2. Models and theories should enable scientists to make accurate deductions and predictions.

Explanation:

A model involves the use of a physical, conceptual, or mathematical representation to describe a real phenomenon that could not be understood by mere direct observation. It could be in the form of a diagram or picture, aircraft model kit etc.

A theory is a well tested and confirmed phenomenon through repeated observations and experiments. It is a stronger assertion that explains the facts about a phenomenon. Such are not guesses or mere saying, but reliable accounts of some phenomenon in the real world.

Therefore for models and theories to be valid, they must explain known facts and enable scientists to make accurate predictions.

Andrews [41]3 years ago

6 0

Do what they was made to do

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3 years ago

Read 2 more answers

8.310x10^2 – 7.210x10^1<br><br>[?]x10^[?]

alisha [4.7K]

Answer:

$7.589\times 10^{2}$

Explanation:

The expression can be solved mathematically as follows:

1) $8.310\times 10^{2}-7.210\times 10^{1}$ Given

2) $8.310\times 10^{1+1} - 7.210\times 10^{1}$ Definition of sum

3) $(8.310\times 10^{1})\times 10^{1}-7.210\times 10^{1}$ $a^{m+n} = a^{m}\cdot a^{n}$ /Associative property

4) $(8.310\times 10^{1}-7.210)\times 10^{1}$ Distributive property

5) $(83.100-7.210)\times 10^{1}$ Multiplication

6) $75.89\times 10^{1}$ Subtraction.

7) $(7.589\times 10^{1})\times 10^{1}$ Multiplication/Associative property

8) $7.589\times (10^{1}\times 10^{1})$ Associative property

9) $7.589\times 10^{2}$ $a^{m+n} = a^{m}\cdot a^{n}$ /Result

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3 years ago

2. How much heat is released when 432g of water cools down from 710C to 180C?

nadya68 [22]

The heat released by the water when it cools down by a temperature difference AT

is Q = mC,AT

where

m=432 g is the mass of the water

C, = 4.18J/gºC

is the specific heat capacity of water

AT = 71°C -18°C = 530

is the decrease of temperature of the water

Plugging the numbers into the equation, we find

Q = (4329)(4.18J/9°C)(53°C) = 9.57. 104J

and this is the amount of heat released by the water.

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3 years ago

Which type of wave does not require a medium to travel through?

nlexa [21]

Hello,

I'm not very sure but I think the correct answer is D) Water Wave

I really hope this helps!!!! Happy Holidays!!!! (:

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3 years ago