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jekas [21]
3 years ago
12

Cutting, melting, bending, or crushing are examples of what kind of change?

Chemistry
2 answers:
Ksivusya [100]3 years ago
8 0

Answer:

those are all physical changes and most physical changes can be undone like crushing a pice of metal you can flatten it back out you anwser is physical change

Explanation:

Fynjy0 [20]3 years ago
4 0

Answer:

It is a physical change because it can be reversed back and no new subtances is dormed.

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Classify the following processes as exothermic or endothermic: (d) a person running;
Sonja [21]

The process releases energy and consequently we classify it as exothermic. (d) a person running releases warmness as muscle mass paintings. therefore, the procedure is exothermic.

d) Exothermic, heat is released as a person runs and muscle groups perform work.

A chemical response or bodily exchange is exothermic if warmth is released by using the system into the environment. Because the surroundings are gaining heat from the system, the temperature of the surroundings increases. The sign of q for an exothermic procedure is -ve due to the fact the device is dropping heat.

Some other examples of exothermic reactions:

1)Snow Formation in Clouds.

2)Burning of a Candle.

3)Rusting of Iron.

4)Formation of Ion Pairs.

5)response of strong Acid and Water. etc...

Learn more about exothermic reactions here: brainly.com/question/14018816

#SPJ4

6 0
2 years ago
What is the main point of the reading? Group of answer choices Many elements combine to make a few compounds. Hawaii is made up
ivanzaharov [21]

Answer:

A few elements combine to make many compounds.

Explanation:

The heading of the reading is 'Few elements, many Compounds'. The reading has focused on the process involved in the formation of elements and compounds. In the Hawaiian Islands the elements are found in abundance. These elements combine together to form compounds. The mountains, greenery, rocks and living matter are made up of many elements and compounds. The elements present helps in forming various compounds.

5 0
3 years ago
Examples of solid mixtures in a classroom
posledela
Chalk, the air, cement
4 0
4 years ago
help me balance & find how many grams of water would be produced if 20.0 liters of O2 gas were burned at a temperature of -1
vova2212 [387]
I have finished the balanced equation part. Give me a little more time for part B.

Edit: Found a way so here it is as well.

6 0
3 years ago
The National Institute for Occupational Safety and Health (NIOSH) sets standards for CCl4 in air at 12.6 mg/m^3 of air (a time a
Licemer1 [7]

Answer:

No, it doesn't.

Explanation:

To convert ppb to mg/m³ we first need to convert to ppm, by just divide the amount by 1,000, so the concentration in the sample is 4.8 ppm.

mg/m³ = (ppm x molar mass)/molar volume

Using the molar mass in gram and the molar volume in liters, multiplying by the parts per million, we will get the concentration in mg/m³.

Molar mass of C = 12 g/mol; molar mass of Cl = 35.5 g/mol

Molar mass of CCl4 = 12 + 4x35.5 = 154 g/mol

Assuming, 25ºC and 1 atm, the molar volume of an ideal gas is 24.45 L, so:

mg/m³ = (4.8 x 154)/24.45

mg/m³ = 30.2

Which is higher than the limit of 12.6 mg/m³

6 0
3 years ago
Read 2 more answers
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