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3 years ago

Which of the following processes are physical changes?

Chemistry

2 answers:

lubasha [3.4K]3 years ago

8 0

C) cutting a snowflake out paper
because someone has to physically cut the paper into a snowflake

Stolb23 [73]3 years ago

7 0

C) and d) are physical changes while b) is chemical

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Identify the class of the 8 organic compound below (alcohol, carboxylic acid, halocarbon, alcohol, ketone, ester, ether). Some w

Darina [25.2K]

Answer:

See below ~

Explanation:

1) Ketone

2) Carboxylic Acid

3) Ketone

4) Ether

5) Alcohol

6) Halocarbon

7) Ester

8) Ketone

4 0

2 years ago

Name ways we use technology in inner and outer space 8th grade science btw

Anna71 [15]

Answer:

Explanation:

Many common everyday services such as weather forecasting, remote sensing, satellite navigation systems, satellite television, and some long-distance communications systems critically rely on space infrastructure. ... Of the sciences, astronomy and Earth science benefit from space technology am in 6th grade btw

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3 years ago

The reaction of nitrogen(g) with hydrogen(g) to form ammonia(g) proceeds as follows: N2(g) 3H2(g)2NH3(g) When 6.44 grams of N2(g

Semenov [28]

The enthalpy of the reaction is obtained as 4.876 kJ.

<h3>What is the enthalpy?</h3>

The enthalpy of a reaction is the heat that is absorbed or emitted in a reaction.

Given the reaction; N2(g) + 3H2(g) ⇔2NH3(g);

Number of moles of N2 = 6.44 grams/28 g/mol

= 0.23 moles

If 1 mole of N2 releases 21.2 kJ of energy

0.23 moles of N2 releases 0.23 moles * 21.2 kJ /1 mole

= 4.876 kJ

Learn more about enthalpy:brainly.com/question/13996238?

#SPJ1

3 0

2 years ago

How do you know if a reaction is exothermic?

n200080 [17]

You know if the reaction releases energy or heat.

Info:
An exothermic reaction is a chemical reaction that releases energy by light or heat. It is the opposite of an endothermic reaction. Expressed in a chemical equation: reactants → products + energy.

3 0

4 years ago

Suppose you have a large coffee can full of pennies. How can you estimate how much money the can contains without counting all t

frez [133]

You can estimate by finding the measure/weight of a single penny and then finding the measure/weight of an empty coffee cup. Once you have that, weigh the whole thing and then go from there to find the amount of pennies :)

6 0

3 years ago