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Svetradugi [14.3K]
3 years ago
8

Does seeing a gas produced always mean a chemical reaction is occurring? Explain.

Chemistry
2 answers:
chubhunter [2.5K]3 years ago
4 0
Seeing signs of a chemical reaction does not always mean that a reaction is happening. For example, a gas (water vapor) is given off when water boils. ... You can tell that it is a physical change because water vapor can condense to form liquid water. In a chemical change, a new substance must be produced.
Alex17521 [72]3 years ago
4 0

Answer:

Explanation:

yes

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Which best describes the importance of the microscope to the development of cell theory? Microscopes color different parts of ce
aliya0001 [1]
Cells are too small to see with the naked eye. 

It's pretty straight forward, use the cross-out method. 

1) Microscopes MAGNIFY images, they don't color the cells. In fact, scientists have to use these chemicals to "stain" or color the cells to see them more easily through microscopes. 

2) If the lenses of a microscope reduced the image of an organism to the size of a cell, you'd be seeing a very tiny human through your microscope, instead of actual cells. 

3) Microscopes don't "trap" anything. In fact, scientists use plates or slides under microscopes to contain what they're studying. 

8 0
3 years ago
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You have dissolved 10 g sodium oxide in 200 ml water.calculate. the concentration of the solution​
mash [69]

0.05M is the concentration of the solution​.

The amount of a chemical substance in a mixture is expressed by the substance's concentration. Concentration can be expressed in numerous ways. In chemistry, the terms "solvent" and "solute" are used to denote the substance of interest and the medium in which it is dissolved, respectively

Subtract the solute's mass from the total volume of the solution. Using m as the solute's mass and V as the total volume of the solution, write out the equation C = m/V. To get the concentration of your solution, divide the mass and volume figures you discovered and plug them in.

C = m / V

C = 10 / 200

C = 0.05M.

Learn more about concentration here:

brainly.com/question/10725862

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6 0
2 years ago
Why is the equation 4Al+302>2Al203 balanced
cestrela7 [59]

Answer:

It's coefficient to the front of each element that requires it.

Explanation:

It is coefficient to the front of each element or compound that requires it. Essentially you are multiplying the amount of atoms or compounds on one side to match the amount on the other side.

8 0
3 years ago
What type of claim must be supported by scientifically valid evidence for it to be approved for use on a food label? A. Health c
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Option A. Health claim

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This is also a food guide to all consumers the food content implied by manufacturers to their products.
8 0
4 years ago
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Number of moles in 145.7 g of squaric acid
Nesterboy [21]
To find moles : moles= Mass (C₄H₂O₄) / RFM (C₄H₂O₄)

so moles = 147.7 / 114 = <span>1.2956mol

hope that helps </span>
3 0
3 years ago
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