What proof did you see in the experiment that a chemical reaction took place?
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Answer:
Yes; new substances formed, as evidenced by the color changes and bubbles. Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color chage, formation of a precipitate, formation of a gas, odor change, temperature change
Related Questions
1. In part 1, you collected data about how the amount of sugar affects the amount of gas produced. Analyze those data and draw a conclusion. (16 points) a. What gas inflated the balloons? (2 points)
Calculate the mass percent composition of sulfur in Al2(SO4)3.
What is a chemical reaction that absorbs heat called?
10) which of the following compounds is a saturated hydrocarbon? A) CH3CH2OH B) CH CH C) ethyne CO CH3CHO 1) which compound is an unsaturated hydrocarbon? CA hexane B) hexanoic acid henne D) ethane. D) CH CH
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The right answer is D. all of the above.
The restoration and rehabilitation of wetlands are today major challenges to maintain a fabric of natural spaces with high heritage value. The ecological engineering that has developed over many years, inspired by methods of renaturation of coastal, alluvial, grassland and forest natural areas has specificities that it is necessary to share to allow access to the greatest number. This knowledge is built on the basis of feedback and scientific knowledge, which is itself constantly evolving. They constitute a base for conducting sustainable operations that are consistent with the maintenance of ecological trajectories as close as possible to the natural model in balance with human activities.
all the option have positive outcomes; benefit the economy by providing jobs, specifically it contributes welfare to the society. Improve wildlife populations, when you say improvement there is an additional change that makes something better or valuable. Reduce soil erosion and flooding in coastal areas; we cannot avoid it but we can prevent the destructive effect of this in our lives. Being prepared from those sudden change can restore wetlands and forests not just along the coast as well as to other areas.
Hardness is indicative of the strength of chemical bonds between elements.
Hardness is determined through a complicated process that requires expensive instruments.
Friedrich Mohs developed the standard hardness scale.
Diamond can scratch quartz.
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Hardness is a physical property
Friedrich Mohs developed the standard hardness scale.
Diamond can scratch quartz.
Answer:The properties of the Hardness are:
- Hardness is a physical property
- Hardness is indicative of the strength of chemical bonds between elements.
- Diamond can scratch quartzExplanation:
Hardness is defined as resistance offered by a material when subjected to any kind of mechanical effort.It is a physical property
Hardness of a materiel indicates its strength that strength of its chemical bond between the atoms and their arrangement in space.
Mohs scale is a scale which measures the hardness of the materiel from 1 to 10. Materiel with higher Mohs scale number will able to scratch materiel with lower Mohs scale score.
The properties of the Hardness are:
Hardness is a physical property
Hardness is indicative of the strength of chemical bonds between elements.
Diamond can scratch quartz.
(2) CO2 (4) N2
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Answer: Option (3) is the correct answer.
Explanation:
It is known that like dissolves like that is, a polar solvent will dissolve only polar compounds. Whereas a non-polar solvent will dissolve only non-polar compound.
Substances whose atoms have large difference in electronegativities are polar in nature. Water is a polar solvent and it is able to dissolve polar molecules.
For example, HCl is a polar or ionic compound so it is soluble in water.
On the other hand, ,
, and
are all non-polar as bond between them is formed due to sharing of electrons.
Hence, we can conclude that at STP, HCl is the substance that is most soluble in .
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Answer:
d
Explanation:
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Enzymes for the breakdown of protein are present in the stomach.
What are the enzymes involved in the digestion of proteins in our body?
Pepsin
- In the presence of an acid, the stomach secretes pepsins, which are proteolytic enzymes.
- About 10–15% of the digestion of proteins is done by the pepsins.
Trypsin
- It is secreted in an inactive form, trypsinogen, by the pancreas.
- Trypsinogen is then activated in the small intestine by the enzyme enterokinase and further helps in protein digestion.
Chymotrypsin and elastase
- These are also secreted by the pancreas.
- Chymotrypsin and elastase are activated by trypsin.
- Responsible for initiating the hydrolysis of protein chains into peptides.
Carboxypeptidases
- The enzymatic action of carboxypeptidases, which are also released by the pancreas, causes the subsequent breakdown of the peptides into smaller molecules and then to individual amino acids.
Learn more about protein digestion here:
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The answer to your questions is C. Stomach
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1 mole ----------> 99.424 g
mole ----------> 0.9876 g
mole = 0.9876 / 99.424
= 0.00993 moles of Zn(OH)2
1 mole ------------> 6.02x10²³
0.00993 ----------> units
units = 0.00993 * 6.02x10²³
= 5.977x10^21 formula units.
hope this helps!.