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Allushta [10]
3 years ago
15

How to tell if a reaction is exothermic or endothermic from an equation?

Chemistry
1 answer:
mart [117]3 years ago
7 0
Hope this table might help!

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Please help last assignment of the day
Andrej [43]

In this qn, you use the mole formula,

amount (mol) = mass (g) ÷ molar mass

(molar mass is the mass number of an element, which u can find by referring to the periodic table)

so by subbing in the values given to you, you can find the answer

5. amount of Cu = 55.9 ÷ 63.5 = 0.880mol (3sf)

6. amount of N2 = 340 ÷ 2(14.0) = 12.1mol (3sf)

(note: you multiply the molar mass of N by 2 as there are 2 N atoms)

for qn 7 and 8, youre finding the mass and not the amount. By bringing the molar mass over to the other side of the formula, you get

mass = amount (mol) × molar mass

thus,

7. mass of Fe = 0.063 × 55.8 = 3.52g (3sf)

8. mass of H2 = 94.7 × 2(1.0) = 47.4g (3sf)

extra things to take note of:

- likewise, you can also find the molar mass of an element by using

molar mass = mass(g) ÷ amount(mol)

^^ this is commonly only needed when you need to find the molar mass of an isotope. the question will give you the amount and mass of the element, and you just need to factor them in to find your answer.

- typically, you use 3 sf in your final answer and 5sf in your working. remember to write (3sf) at the end of your number statement when necessary.

- when you get an answer of (eg.) 0.6mol, you still need to write it in 3sf, so your answer would be 0.600mol

3 0
3 years ago
Escribe dos ejemplos para cada tipo de mezcla entre: ● Sólido-sólido:
saul85 [17]

Answer:

1) arena y azucar

2) agua fangosa

3) agua en el aire

4) oxígeno en nitrógeno

5 0
3 years ago
What is a solution?
Mama L [17]
The correct answer is a solute and a solvent

A solution is any homogenous mixture of two or more substances. It does not necessarily have to be liquid or gaseous. 
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3 years ago
Tell whether each is mass, volume, or density. Some may be used more than once
mash [69]
Search up the answer on safari it will be easy
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2 years ago
Which statement is true? (2 points) Select one: a. Geothermal power plants use the renewable resource of heat from within the Ea
love history [14]

The correct answer is A, since it is the only sensible answer.

5 0
3 years ago
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