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3 years ago

PLZ HELP IM GIVING BRAINLEST TO WHOEVER HELPS ME AND GETS THE RIGHT ANSWER.

Chemistry

2 answers:

Nana76 [90]3 years ago

5 0

Answer:

From hot tea to the ice cube

From the warm coffee to my cold hands

From the hot sand to my feet

Explanation:

Heat always travels from a hot object to a colder object, until equilibrium is reached and the objects are at the same temperature.

maxonik [38]3 years ago

3 0

Answer:

Numbers 1, 4, and 6 show the correct direction of energy flow...

#1. From hot tea to the ice cube

#4. From the warm coffee to my cold hands

#6. From the hot sand to my feet

Please give me brainliest!! I need 3 more brainliest to become an Expert!! Please help me!!

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Calcium carbonate breaks down into calcium oxide and liberates carbon dioxide. The whole reaction is driven by heat. What type o

fredd [130]

Answer: Thermal decomposition

Explanation:

Decomposition is a type of chemical reaction in which one reactant forms two or more than two products.

Decomposition reactions require breaking of bonds which require energy and thus all of the decomposition reactions are endothermic reactions. They require energy in the form of heat, electricity or sunlight and thus called as thermal, electrolytic and photolytic decomposition respectively.

The decomposition reaction for calcium carbonate breaks down into calcium oxide and liberates carbon dioxide is :

$CaCO_3\rightarrow CaO+CO_2$

5 0

3 years ago

Imagine you had HCl with a concentration of exactly 0.10 mol/dm3. If 0.023 dm3 of a sodium hydroxide solution, NaOH (aq), could

polet [3.4K]

Answer:

Explanation:

Step 1: Calculate the amount of sodium hydroxide in moles

Volume of sodium hydroxide solution = 25.0 ÷ 1,000 = 0.0250 dm3

Rearrange:

Concentration in mol/dm3 =

Amount of solutein mol = concentration in mol/dm3 × volume in dm3

Amount of sodium hydroxide = 0.100 × 0.0250

= 0.00250 mol

Step 2: Find the amount of hydrochloric acid in moles

The balanced equation is: NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l)

So the mole ratio NaOH:HCl is 1:1

Therefore 0.00250 mol of NaOH reacts with 0.00250 mol of HCl

Step 3: Calculate the concentration of hydrochloric acid in mol/dm3

Volume of hydrochloric acid = 20.00 ÷ 1000 = 0.0200 dm3

Concentration in mol/dm3 =

= 0.125 mol/dm3

Step 4: Calculate the concentration of hydrochloric acid in g/dm3

Relative formula mass of HCl = 1 + 35.5 = 36.5

Mass = relative formula mass × amount

Mass of HCl = 36.5 × 0.125

= 4.56 g

So concentration = 4.56 g/dm3

8 0

3 years ago

Is a dissolved oxygen level of 15 suitable for fish

Dvinal [7]

Yes, because if its higher than their will be more aquatic life able to live their.

4 0

3 years ago

How many moles are equal to 4.15x10^23 molecules of carbon monoxide?

Rudiy27

To be able to determine the number of moles that a certain number of molecules comprises, we simply divide the number of molecules by the Avogadro's number which is equal to 6.022 x 10^23.

n = M/A

where n is the number of moles, M is the number of molecules, and A is Avogadro's number. Substituting the known values,

n = (4.15 x 10^23 molecules)/(6.022 x 10^23 molecules/mol)

Simplifying,

n = 0.689 moles

<em>Answer: 0.689 moles</em>

7 0

3 years ago

Read 2 more answers

If I use the dropper to add 10 mL of drink mix to 50 mL of water, what is the

Yuliya22 [10]

Answer:

16.7%

Explanation:

From the question given above, the following data were obtained:

Volume of drink mix = 10 mL

Volume of water = 50 mL

Percentage of drink mix =?

Next, we shall determine the total volume of the solution. This can be obtained as follow:

Volume of drink mix = 10 mL

Volume of water = 50 mL

Total volume of solution =?

Total volume of solution = (Volume of drink mix) + (Volume of water)

Total volume of solution = 10 + 50

Total volume of solution = 60 mL

Finally, we shall determine the percentage of the drink mix in the solution. This can be obtained as follow:

Volume of drink mix = 10 mL

Total volume of solution = 60 mL

Percentage of drink mix =?

Percentage of drink mix = Vol. of drink mix / total volume × 100

Percentage of drink mix = 10/60 × 100

Percentage of drink mix = 16.7%

4 0

3 years ago