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3 years ago

7

Which of these changes would be classified as producing a chemical change a. freezing water b. mixing salt and water to make a s

olution c. heating cooking oil d. mixing a acid and a base to make a salt

1 answer:

trasher [3.6K]3 years ago

4 0

Answer:

Option B , Option C and Option D

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Why do A and T (and G and C) pair in a DNA double helix?

Usimov [2.4K]

I just took a quiz on this! It's D!

3 0

3 years ago

The standard cell potential (Eºcell) for the reaction below is +0.63 V. The cell potential

Likurg_2 [28]

Answer:

63.5 w isvthebanswerok is th answer

3 0

2 years ago

sladkih [1.3K]

Answer:

A = 65.46 u

Explanation:

Given that,

The composition of zinc is as follows :

Zn-64 = 48.63%

Zn-66 = 27.90%

Zn-67 = 4.10%

Zn-68 = 18.75%

Zn-70 = .62%

We need to find the average atomic mass of the given element. It can be solved as follows :

$A=\dfrac{48.63\times 64+27.90\times 66+4.1\times 67+18.75\times 68+0.62\times 70}{100}\\A=65.46\ u$

So, the average atomic mass of zinc is 65.46 u.

6 0

3 years ago

Large crystals are formed when _____. igneous rocks cool very quickly metamorphic rocks change into igneous rock sedimentary roc

vivado [14]

igneous rocks cool very slowly

Explanation:

Large crystals are formed when rocks cool very slowly. This gives time for crystallization nuclei to form and other crystals aggregates round it.

Large crystals in rocks are typical of intrusive igneous rocks.
These rocks are formed beneath the earth surface and they usually have big crystals.
This because they cool slowly and have time for crystal formation.
Rocks that cools rapidly are extrusive igneous rocks.
They are usually fine grained and glassy in nature.

learn more:

Volcanic eruptions brainly.com/question/5055821

#learnwithBrainly

3 0

3 years ago

Read 2 more answers

A tanker truck carrying 6.05×103 kg of concentrated sulfuric acid solution tips over and spills its load. The sulfuric acid solu

irinina [24]

Answer:

6,216.684 kilograms of sodium carbonate must be added to neutralize $6.05\times 10^3 kg$ of sulfuric acid solution.

Explanation:

Mass of sulfuric acid solution = $6.05\times 10^3 kg=6.05\times 10^6 g$

$1 kg = 10^3 g$

Percentage mass of sulfuric acid = 95.0%

Mass of sulfuric acid = $\frac{95.0}{100}\times 6.05\times 10^6 g$

$=5,747,500 g$

Moles of sulfuric acid = $\frac{5,747,500 g}{98 g/mol}=58,647.96 mol$

$H_2SO_4+Na_2CO_3\rightarrow Na_2SO_4+CO_2+H_2O$

According to reaction , 1 mole of sulfuric acid is neutralized by 1 mole of sodium carbonate.

Then 58,647.96 moles of sulfuric acisd will be neutralized by :

$\frac{1}{1}\times 58,647.96 mol=58,647.96 mol$ of sodium carbonate

Mass of 58,647.96 moles of sodium carbonate :

$106 g/mol\times 58,647.96 mol=6,216,683.76 g$

6,216,683.76 g = 6,216,683.76 × 0.001 kg = 6,216.684 kg

6,216.684 kilograms of sodium carbonate must be added to neutralize $6.05\times 10^3 kg$ of sulfuric acid solution.

3 0

3 years ago