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jonny [76]
3 years ago
14

When do scientists use models i will mark best one brainlest

Chemistry
2 answers:
Nuetrik [128]3 years ago
4 0
They use models when they are trying to find stuff in the ground like fossils so they match them up so they can find if it’s the same or not please mark brainliest must appreciated !
aliina [53]3 years ago
3 0
Scientists use models when doing research to lay out their data. They can also use them to explore phenomena that are too vast complex or to dangerous to study first hand. They use it to investigate objects or processes that happen too slowly to quickly or on to small of a scale to observe directly
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the atomic number of four elements p,q,r,s are 6,8,10 and 12 respectively. the two elements which can bond ionically are:
denis-greek [22]

Answer:

The atomic numbers of four elements A, B, C, and D are 6,8,10, and 12 respectively. The two elements which can react to form ionic bonds (or ionic compounds) are B (8= 2,6) and D (12 =2,8,2). So D donates its two electrons to B to fulfill their octet.

Explanation:

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2 years ago
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Combustion analysis of 0.300 g of an unknown compound containing carbon, hydrogen, and oxygen produced 0.5213 g of co2 and 0.283
Lyrx [107]
First, we have to get how many grams of C & H & O in the compound:
- the mass of C on CO2 = mass of CO2*molar mass of C /molar mass of CO2
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- the mass of H atom on H2O = mass of H2O*molar mass of H / molar mass of H2O
                                                 =0.2835 * 2 / 18 = 0.0315 g
- the mass of O = the total mass - the mass of C atom - the mass of H atom
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Convert the mass to mole by divided by molar mass
C(0.142/12) H(0.0315/2) O(0.1265/16) 
C(0.0118) H(0.01575) O(0.0079) by dividing by the smallest value 0.0079
C1.504 H3.99 O1 by rounding to the nearst fraction
C3/2 H4/1 )1/1 multiply by 2 
∴ the emprical formula C3H8O2
           



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3 years ago
Why is it important for the pH of blood to remain constant?
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3 years ago
hich quantity describes how spread out a set of data is? O A. Standard deviation O B. Percent error O C. Line of best fit D. Mea
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The answer to this is B.

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3 years ago
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