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4 years ago

Which theory states that Earth's lithosphere is divided into moving pieces?

Chemistry

2 answers:

Lubov Fominskaja [6]4 years ago

5 0

Answer:

plate tectonics

Explanation:

meriva4 years ago

4 0

Answer:

B. Plate tectonics

Explanation:

I took the test here is my proof that this is correct(I hope I helped):

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An enzyme is discovered that catalyzes the chemical reaction:SAD -------->HAPPY

jekas [21]

Answer: Km = 10μM

Explanation: Michaelis-Menten constant (Km) measures the affinity a enzyme has to its substrate, so it can be known how well an enzyme is suited to the substrate being used. To determine Km another value associated to an eznyme is important: Turnover number (Kcat), which is the number of time an enzyme site converts substrate into product per unit time.

Enzyme veolcity is calculated as:

$V_{0} = \frac{E_{t}.K_{cat}.[substrate]}{K_{m}+[substrate]}$

where Et is concentration of enzyme catalitic sites and has to have the same unit as velocity of enzyme, so Et = 20nM = 0.02μM;

To calculate Km:

$V_{0}*K_{m} + V_{0}*[substrate] = E_{t}.K_{cat}.[substrate]$

$K_{m} = \frac{E_{t}.K_{cat}.[substrate]-V_{0}*[substrate]}{V_{0}}$

$K_{m} = \frac{0.02*600*40-9.6*40}{9.6}$

Km = 10μM

The Michaelis-Menten for the substrate SAD is 10μM.

3 0

3 years ago

What is the volume of 0.80 grams of O2 gas at stp?

sergey [27]

Answer: The volume occupied by $O_2$ at STP is 0.56 L.

Explanation:

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

We are given:

Given mass of oxygen = 0.80 g

Molar mass of oxygen = 32 g/mol

Putting values in above equation, we get:

$\text{Moles of oxygen}=\frac{0.80g}{32g/mol}=0.025mol$

At STP:

1 mole of a gas occupies 22.4 L of volume.

So, 0.025 moles of oxygen gas will occupy = $22.4\times 0.025=0.56L$ of volume.

Hence, the volume occupied by $O_2$ at STP is 0.56 L.

4 0

4 years ago

Read 2 more answers

What is the molarity of a solution that contains 1 mol CaCl2 dissolved in 2 L of solution?

SVETLANKA909090 [29]

Answer:

molarity= 0.5M

Explanation:

n=CV

n= 1mol, C= ?, V= 2L

1= C×2

C= 0.5M

5 0

3 years ago

Look at the potential energy diagram for a chemical reaction.

vladimir1956 [14]

Answer: The activation energy is 10 kJ and the reaction is exothermic.

Explanation: Exothermic reactions are those in which heat is released and thus the energy of products is less than the energy of reactants.

Endothermic reactions are those in which heat is absorbed and thus the energy of products is more than the energy of reactants.

Activation energy is the extra amount of energy required by the reactants to cross the energy barrier to convert to products.

Given : Energy of reactants = 40kJ

Energy of activation: (50-40)=10 kJ

Energy of products = 50 kJ

Energy of products = 15 kJ

Thus Energy of products (15kJ) < Energy of reactants(40kJ), the reaction is exothermic as energy has been lost to surroundings in the form of heat.

8 0

4 years ago

Rank the compounds CH3OH CH3CH2OH CH3CH2CH2OH in terms of increasing evaporation rate. 1. CH3CH2CH2OH < CH3CH2OH < CH3OH 2

Artemon [7]

Answer: Option (5) is the correct answer.

Explanation:

It is known that more is the number of carbon atoms linearly present in a compound more will be its boiling point. This is because then more number of intermolecular forces are present within the atoms of a compound.

Hence, lesser is the number of carbon atoms present less will be the intermolecular forces present in it. Therefore, more readily the compound will evaporate into the atmosphere.

Thus, we can conclude that given compounds are ranked in increasing rate of evaporation as follows.

$CH_{3}CH_{2}CH_{2}OH$ < CH_{3}CH_{2}OH[/tex] < $CH_{3}OH$

5 0

3 years ago