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3 years ago

Which is NOT represented in a chemical change demonstrated chemical reactions?

Chemistry

1 answer:

Vikentia [17]3 years ago

8 0

Answer:

Option C

Explanation:

A) A chemical equation is simply the symbolic representation of a chemical reaction using the form of symbols and formulae. Thus, option A is not the answer.

B) A product is the substance that shows at the end of a chemical reaction. Thus, option B is not the answer.

C) Law of conservation of mass in chemistry states that even in chemical reactions or physical transformations, that mass cannot be created nor destroyed. Which means that mass is conserved. This has nothing to do with chemical change demonstrated chemical reactions. Thus, option C is correct.

D) reaction rate is the speed that a chemical reaction occurs. Thus, options D is not correct.

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Which of the three objects has the greatest density? Why? (GOLD BARS/GOLD COINS/GOLD CHAIN)

Rama09 [41]

Answer:

They all have the same density

Explanation:

Density is an intensive physical property, meaning that as long as the chemical formula is the same, that specific intensive physical property will be the same. For example. One kilogram of feathers has the same mass as one kilogram of bricks. Why? They both have a mass of one kilogram.

It's the same thing here. Since all the objects are (assumed to be) made up of 100% gold, they would all have the same density regardless of the mass. For extra points, say the density of each object is $19 \frac{g}{cm^3}$ .

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3 years ago

1.Which of the following are outputs of Cellular Respiration? Choose all that apply *

svlad2 [7]

Oxygen

Photosynthesis

ATP (chemical energy)

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4 years ago

How do matter cycles demonstrate the conservation of matter in a system?

damaskus [11]

Answer:

These systems are defined both by the types of energy and matter they contain and by how that matter and energy move through and between systems. In natural systems, both energy and matter are conserved within a system. This means that energy and matter can change forms but cannot be created or destroyed.

Explanation:

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3 years ago

Find the empirical formula of the following compounds:<br> (c) A hydrocarbon with 79.9 mass % carbon

rodikova [14]

The compound is 82.76% C and 17.24% H

In chemistry, the empirical formula of a chemical compound is the simplest whole number ratio of atoms present in a compound.

<h3>Describe the empirical formula.</h3>

The simplest whole number ratio of atoms in a compound is the empirical formula of a chemical compound in chemistry. Sulfur monoxide's empirical formula, SO, and disulfur dioxide's empirical formula, S2O2, are two straightforward examples of this idea.

The simplest whole number ratio of each type of atom in a compound is its empirical formula. It can be determined from data on the mass of each component in a compound or from the composition's proportion.

To learn more about chemical reaction visit:

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8 0

2 years ago

How many grams of H2 would be formed if 34 grams of carbon reacted with an unlimited amount of H2O? The reaction is:

Readme [11.4K]

Answer:

There is 5.72 grams of H2 formed

1) C+ H2O → CO + H2

2) We start with 34 grams of carbon that will react with an excess of H2O

3) 5.72 grams of H2

Explanation:

Step 1: Data given

Mass of carbon = 34.00 grams

H2O is in excess

Molar mass of C = 12 g/mol

Molar mass of H2O = 18.02 g/mol

Step 2: The balanced equation

C+ H2O → CO + H2

Step 3: What is the starting substance

We start with 34 grams of carbon that will react with an excess of H2O

Step 4: Calculate moles carbon

Moles C = mass C / molar mass C

Moles C = 34.00 grams / 12.00 g/mol

Moles C = 2.833 moles

Step 5: Calculate moles H2

Carbon is the limiting reactant.

For 1 mol Carbon we need 1 mol H20 to produce 1 mol CO and 1 mol H2

For 2.833 moles C we'll have 2.833 moles H2

Step 6: Calculate mass of H2

Mass H2 = moles H2 * molar mass H2

Mass H2 = 2.833 moles * 2.02 g/mol

Mass H2 = 5.72 grams of H2

8 0

4 years ago

Which is NOT represented in a chemical change demonstrated chemical reactions?​

Which is NOT represented in a chemical change demonstrated chemical reactions?