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4 years ago

Eggs with tough protective shells developed to

Chemistry

2 answers:

pychu [463]4 years ago

8 0

The correct answer is option C.

Eggs with tough protective shells developed to prevent the embryo from drying out.

The hard shell of the egg is made of calcium carbonate and it protects the embryo from predators and from drying out. The egg shell is porous which allows air and moisture to pass through its pores.

White raven [17]4 years ago

6 0

Answer: The correct answer is -C) Prevent the embryo from drying out.

The amniotic egg of birds and reptiles is surrounded by an outer, tough, and protective shell, which protects the egg from any damage, predators, pathogens, and drying out.

The tough shell and extra embryonic membranes create a safe environment where an embryo can develop into a whole organism (with different organs like eyes ,ears, brain, kidney, heart).

Thus, option C) is the right answer.

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Now liters at the same temperature and pressure: liters of H2 + liters of O2 → liters of H2O

iragen [17]

The answer is 2H2 + O2----> 2H2O

5 0

3 years ago

What is the acceleration of an object that goes from 3 m/s to 5 m/s in 8 s?

nikdorinn [45]

Answer: 0.25m/s2

Explanation:

Acceleration is change in velocity with time

V = final velocity = 5m/s

U =Initial velocity = 3m/s

t = time = 8s

a = Acceleration =?

a = V — U / t

a = (5 — 3) / 8

a = 2/8

a = 0.25m/s2

8 0

4 years ago

Read 2 more answers

Problem: If you push an object with a constant force of 100 N over a 10-meter distance. How much energy transfer occurs on the o

Sveta_85 [38]

The energy transferred on the object is 1000 Joules.

Given:

An object on which a constant force of 100 N was applied to displace it over a distance of 10 meters.

To find:

The energy transfer occurs on the object.

Solution

The force applied on the object = F = 100 N

The displacement of the object = d = 10 m

The energy transferred on the object or work done is given by:

$W = F\times d\\W=100 N\times 10 m = 1,000 J$

The energy transferred on the object is 1000 Joules.

Learn more about work done here:

brainly.com/question/8119756?referrer=searchResults

brainly.com/question/3951672?referrer=searchResults

8 0

3 years ago

Instead of using ratios for back titrations we can also use molarities, if our solutions are standardized. A 0.196 g sample of a

kvv77 [185]

Answer:

The mass percent of Al(OH)₃ is 15.3%

Explanation:

The reaction is:

Al(OH)₃ + 3HCl = AlCl₃ + 3H₂O

The excess acid is neutralized with a solution of sodium hidroxide, in the reaction:

NaOH + HCl = NaCl + H₂O

The total moles of HCl is:

$n_{HCl,total} =M_{HCl} *V_{HCl} =0.111*0.025=2.78x10^{-3} moles$

From the second titration, the moles of excess of HCl is:

$n_{HCl,excess} =n_{NaOH} =M_{NaOH} *V_{NaOH} =0.132*0.01105=1.46x10^{-3} moles$

The difference between the total and excess of HCl, it can be know the moles that reacts with the aluminum hydroxide, is:

$n_{HCl,reacts} =n_{HCl,total}-n_{HCl,excess} =2.78x10^{-3} moles-1.46x10^{-3} moles=1.32x10^{-3} moles$

The ratio between HCl and Al(OH)₃ is 3:1. The MW for aluminum hydroxide is 78 g/mol, thus:

$m_{Al(OH)3} =1.32x10^{-3} molesHCl*\frac{1molAl(OH)3}{3molesHCl} *\frac{78gAl(OH)3}{1molAl(OH)3} =0.03g$

The percentage of Al(OH)₃ is:

$Percentage-Al(OH)3=\frac{m_{Al(OH)3} }{m_{antiacid} } *100=\frac{0.03}{0.196} =15.3$ %

3 0

3 years ago

Which part of a plant must be fertilized in order for a fruit or vegetable to grow?

vredina [299]

Answer:

I think its not A Or B So then its gonna be c or d and my guess is C

Explanation:

3 0

3 years ago