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VikaD [51]
3 years ago
11

A chemical reaction can start when enough activation energy is added to the reactants. Do you think the activation energy for ch

emical reactions in living things is high or low/ Explain your answer
Chemistry
2 answers:
pav-90 [236]3 years ago
8 0
I think the best answer would be high. A chemical reaction can start when enough activation energy is added to the reactants. In living things the activation energy for chemical reactions is high. Because enzymes are present in cells in order to speed up reactions and give an alternative way for the reaction to occur.
e-lub [12.9K]3 years ago
7 0
High, the enzymes in cells function or speed up reactions by lowering the activation energy.
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Pure substance definition is?
Vaselesa [24]

Answer:

It is a sample of matter with both constant and definite composition

Explanation:

8 0
3 years ago
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The naturally occurring radioactive decay series that begins with 23592U stops with formation of the stable 20782Pb nucleus. The
dsp73

Answer: There are 7 alpha-particle emissions and 4 beta-particle emissions involved in this series

Explanation:

Alpha Decay: In this process, a heavier nuclei decays into lighter nuclei by releasing alpha particle. The mass number is reduced by 4 units and atomic number is reduced by 2 units.

Beta Decay : It is a type of decay process, in which a proton gets converted to neutron and an electron. This is also known as -decay. In this the mass number remains same but the atomic number is increased by 1.

In radioactive decay the sum of atomic number or mass number of reactants must be equal to the sum of atomic number or mass number of products .

_{92}^{235}\textrm{U}\rightarrow _{82}^{207}\textrm{Pb}+X_2^4\alpha+Y_{-1}^0e

Thus for mass number : 235 = 207+4X

4X= 28

X = 7

Thus for atomic number : 92 = 82+2X-Y

2X- Y = 10

2(7) - Y= 10

14-10 = Y

Y= 4

_{92}^{235}\textrm{U}\rightarrow _{82}^{207}\textrm{Pb}+7_2^4\alpha+4_{-1}^0e

Thus there are 7 alpha-particle emissions and 4 beta-particle emissions involved in this series

3 0
3 years ago
Name the type of equation shown here: 2NaBr+Ca(OH)2 —>CaBr2+2NaOH
sergeinik [125]
A) Double replacement
Because the reactants switch when they become products
6 0
2 years ago
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The ksp value for lead(ii chloride is 2.4 × 10?4. what is the molar solubility of lead(ii chloride?
charle [14.2K]
Molar solubility is number of moles of the solute that can be dissolved per liter of solution before the solution becomes saturated. 

The molar solubility of lead(ii) chloride with ksp value of 2.4 × 10e4 can be solve as: 

Ksp = s2 = 2.4 × 10e4
s2 = 2.4 × 10e4
s = √(2.4 × 10e4)
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6 0
3 years ago
PLEASE HELP ME !!!!!!
Leviafan [203]

Answer: b

Explanation:

By adding heat you are adding more energy

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3 years ago
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