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ryzh [129]
3 years ago
10

HELP ASAP PLEASE WILL GIVE 12 points

Chemistry
2 answers:
bija089 [108]3 years ago
8 0

Answer:

zinc powder + dilute nitric acid

Decrease the temperature in Exothermic reactions (Reactions that release energy, or become hot) Add a catalyst (A substance that reduces activation energy, speeding up the reaction) Increase the concentration of reactants. Increase the concentration of catalysts

Explanation:

Brainliest?

77julia77 [94]3 years ago
8 0

Explanation:

Answer:

Sana makatulong

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Enzymes increase the rate of a reaction by __________? (A) Contributing water to the reaction. (B) Contributing electrons to the
Hatshy [7]
E. Increasing the temperature of the substrates 

The reaction rate increases as the temperature is raised. The increased temperature comes from an increase in kinetic energy. Enzymes are efficient catalysts for reactions, and due to the shape of the molecules in an enzyme, they are selective as to which reactions they catalyze. 
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4 years ago
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4. Scientists are studying photosynthesis in a forest ecosystem that has plants, animals, and
Svetlanka [38]

Answer:

Plants

Explanation:

Animals and decomposers do not go through the process of photosynthesis. Animals do not make their own food like plants do, and decomposers feed on matter that is decomposing. Hope this helped :)

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3 years ago
In the laboratory you are asked to make a 0.303 m cobalt(II) sulfate solution using 275 grams of water. How many grams of cobalt
valentinak56 [21]

Answer: 12.92g of CoSO4

Explanation:

Molar Mass of CoSO4 = 59 + 32 + (16x4) = 59 + 32 +64 = 155g/mol

Molarity of CoSO4 = 0.303mol/L

Mass conc. In g/L = Molarity x molar Mass

= 0.303x155 = 46.965g/L

275 grams of water = 0.275L of water

46.965g of CoSO4 dissolves in 1L

Therefore Xg of CoSO4 will dissolve in 0.275L i.e

Xg of CoSO4 = 46.965x0.275 = 12.92g

Therefore 12.92g of CoSO4 is needed

4 0
3 years ago
3. The opening that allows light to enter the eye is the
xxMikexx [17]

Answer:

A)  Iris

Explanation:

The Iris controls the diameter of the opening in your eye, thus also controlling the amount of light let inside. It's also reponsible for the colour of you eye.

4 0
3 years ago
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Which is the best reason for choosing the beaker for heating the solution? The beaker is the only container that can withstand h
lyudmila [28]

Answer: The beaker will not tip over when placed on the hot plate


Justification:


Since beakers have flat surface bottoms (usually and this is the condition to use them for this particular application) they can be placed safely on the hot plate without the risk that the they tip over.


Beakers are wide mouth cylindrical vessels used in laboratories to store, mix and heat liquids. Most are made of glass, in which case the glass is resistant to the flame and does not break when exposed to high temperatures or when is heated by direct contact on a hot plate.


So, their safe shape (flat bottom) that makes them stable, along with their ability to withstand high temperatures, make them suitable to heat solutions in laboratories.



6 0
4 years ago
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