CHEMISTRY HIGH SCHOOL

In the chemical reaction in which sucrose is heated and decomposes to form carbon dioxide and water, which of the following is a reactant?a. sucrose
c. water
b. carbon dioxide
d. heat

Answers

Answer 1
Answer:

A reaction in which the reactants splits to produce two or more products is called a decomposition reaction.

It can be represented as:

XY ------> X + Y

The correct answer is:

Option A. Sucrose

This can be explained as:

  • The reaction for the decomposition of sucrose is given as:

C₁₂H₂₂O₁₁ (Sucrose)  + 12 O₂ -----> 12 CO₂ (Carbon dioxide)  +  11 H₂O (water)

  • The reactant of a reaction is written generally on the left side of the reaction.

  • The reactant is a substance that reacts and undergoes chemical changes to form products.

Therefore, sucrose is the reactant.

To learn more about decomposition reaction, reactants and products follow the link:

brainly.com/question/2348108
Answer 2
Answer: in the chemical reaction in which sucrose is heated and decomposes to form carbon dioxide  and water a. sucrose is a reactant

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Stars are formed from interstellar clouds because ofthe Law of Entropy
the Law of Universal Gravitation
the Law of Stellar Evolution
the Law of Propulsion

Answers

The answer is D. Stars are formed from interstellar clouds because of the Law of Universal Gravitation. The interstellar clouds are termed as nebula. When other stars dies a supernova occurs then the gravity from this pushes matter into the clouds until it cannot overcome the gravitational pull and it collapses which heats matter up forming a star.

Mercury is a liquid meteal but it is not hard? how can we say it is a metal

Answers

What's the problem ? Hardness is not the definition of a metal. You need to expand your thinking. EVERY element is solid, liquid, and gas, over different ranges of temperature ... including all of the metals. There are only TWO elements that are liquid AT ROOM TEMPERATURE, and mercury is one of them. But on a mild day at the south pole, mercury is solid too.

While out on a hike, you find an unknown mineral. how would test the mineral to find out what it is?

Answers

You can find out what mineral it is when you bring it with you after you hike. You can bring it to a laboratory that specializes on mineral rocks for testing. They know what they should do to find out what it is. Hope this helps. Have a nice day. 

How many atoms are present in a sample of Calcium (Ca) weighing 127.38g?

Answers

Answer:

1.9139 × 10²⁴ atoms Ca

General Formulas and Concepts:

Chemistry - Atomic Structure

  • Reading a Periodic Table
  • Using Dimensional Analysis
  • Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

Explanation:

Step 1: Define

127.38 g Ca

Step 2: Identify Conversions

Avogadro's Number

Molar Mass of Ca - 40.08 g/mol

Step 3: Convert

127.38 \ g \ Ca((1 \ mol \ Ca)/(40.08 \ g \ Ca) )((6.022 \cdot 10^(23) atoms \ Ca)/(1 \ mol \ Ca) ) = 1.91388 × 10²⁴ atoms Ca

Step 4: Check

We are given 5 sig figs. Follow sig fig rules and round.

1.91388 × 10²⁴ atoms Ca ≈ 1.9139 × 10²⁴ atoms Ca

How many moles are in 1.23 X 1050 atoms of calcium carbonate, CaCO3?

Answers

Answer:

Explanation:1 mole is equal to 1 moles CaCO3, or 100.0869 grams.

How many grams of CuSO4 are there in 100.0 g of hydrate? How many moles?

Answers

the hydrate form of CuSO4 has 5 water molecules (CuSO4-5H20) copper (II) Sulfate pentahydrate or commonly known as blue vitriol. 

To solve, the following molar masses are to be known. 
CuSO4.5H2O (hydrate)  - 249.7g/mole
CuSO4 (anhydrous) -159.6g/mole
Also there molar ratio of the hydrate and CuSO4 is 1. 

the mass of the hydrate is to be divided by the molar mass of the hydrate then multiplied by the ratio (1) to get the moles of hydrate and multiplied by the molar mass of the anhydrous to get the mass in grams. 

moles = (100g/249.7)*1 =  0.4 moles hydrate
grams = 0.4*159.6 =  64.9 grames hydrate
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