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3 years ago

How to tell if an equation is exothermic or endothermic?

1 answer:

3 0

The standard enthalpy change of a reaction is positive thus endothermic.

The standard enthalpy change of a reaction is negative thus exothermic.

Hope it helped!

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Which of the following are required for plants to carry out photosynthesis?

Vika [28.1K]

Answer:

Carbon dioxide, water, and sunlight

Explanation:

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2 years ago

Power plants use carbonic acid to remove sulfur oxide gases.

likoan [24]

Is this a question or a statement?

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3 years ago

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How many moles of chlorine (Cl) atoms are in a sample of 1.72 × 1022 atoms? 0.0286 mol Cl 35.0 mol Cl 1.03 × 1023 mol Cl 1.04 ×

kogti [31]

Given information : Sample of $1.72\times 10^{22} atoms$

We need to find the moles of Chlorine in the given sample.

We can say that we need to find moles from the given atoms.

Relation between mole and atom is given by : $1 mole = 6.022\times 10^{23} atoms$

Where $6.022\times 10^{23}$ is Avogadro number.

$1.72\times 10^{22} atoms\times \frac{1 mole}{6.022\times 10^{23} atoms}$

$1.72\times 10^{22}\times \frac{1 mole}{6.022\times 10^{23}}$

On solving the above equation , atoms(unit) gets cancelled out and we get 0.0286 mol.

In the given sample the moles of Chlorine (Cl) is 0.0286 mol , so option A is correct.

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3 years ago

(ii) Describe another method for making ethanol.

Aloiza [94]

Answer:

There are essentially three methods used to produce ethanol:

Manufacture from ethene using steam (the "synthetic" route)

Production from sugars and starches by fermentation, using yeasts.

Production from biomass waste, using bacteria.

Please give brainlist if this helped

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2 years ago

How does earth atmosphere affect the motion of a meteroid

zaharov [31]

When a meteroid goes into the atmosphere the friction starts slowing it down and generating heat.

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3 years ago