All categories

3 years ago

I NEED HELP PLEASE, THANKS!

Chemistry

2 answers:

laila [671]3 years ago

6 0

Answer:

See explanation

Explanation:

An endothermic reaction is one that requires energy in the form of heat, which you observe from the outside as the chemical getting cold (like in a cold pack). An exothermic reaction is the opposite, generating heat on its own through the reaction (like in a hot pack).

Hope this helps!

Viefleur [7K]3 years ago

3 0

Answer:

endothermic reaction is cooler than surroundings and exothermic reaction is hotter than surroundings

Explanation:

They are chemical reactions that absorb and release heat.

Hope this helps :)

You might be interested in

How many total atoms of each element are presented in the following formula

Scorpion4ik [409]

Answer:

Aluminium (Al): (3*2)+(5*2)=16

Sulphor (S): (3*1)=3

Oxygen (O): (4*3)+(3*1)=15

7 0

3 years ago

Explain how creativity can play a role in the construction of scientific questions and hypotheses.

sweet-ann [11.9K]

Scientific questions and hypotheses come up frequently while one is engaged in investigating a scientific phenomenon such as natural geological phenomena as may occur in geological mapping in the field. For example, there may be a question does this canyon or deeply incised valley which is quite straight follow a weakness in the earth's crust like a major fault or the direction of bedding in well bedded sedimentary rocks. In a particular topographic area, some hypotheses which may be developed is that valleys follow geological structure whereas ridges follow resistant rocks like quartzites or quartz sandstones or in the ocean, points or capes may represent resistant quartz sandstones and bays may represent weak soft shales recessively weathering

4 0

3 years ago

You have at your disposal 3 1-pound bags of various pure salts that dissolve readily in water. You can add one of the bags to a

Sedaia [141]

Answer:

This question appears incomplete

Explanation:

However, it should be noted that addition of soluble salts generally lowers the freezing point of water hence after the addition, water will no longer freeze at 0°C but lower.

Soluble salts tend to form more ions in water, it is these ions that are responsible for interfering with the hydrogen bonds hence lowering the freezing. Thus, (since each bag are of the same weight) <u>the bag that contains the salt that ionizes more in water will lower the freezing point by the greatest amount</u>.

NOTE: Different weight of the salts could lead to more ions been formed in the water by some salts as against the other.

6 0

4 years ago

What is the mass in grams of 3x10 atoms of helium

Zepler [3.9K]

Answer:

here

Explanation:

What is the total mass of $$3.01 x 10^23$$ atoms of helium gas?

✓ Well $$"Avogadro's number"$$ of helium atoms has a mass of $$4.0*g$$. Explanation: And $$"Avogadro's number"$$

3 0

3 years ago

What is the difference between a crystalline material and an amorphous material? Give an example of each type.

Igoryamba

Answer :

As we know that there are two types of solids.

(1) Amorphous Solids

(2) Crystalline Solids

Amorphous Solids : It is a type of solids in which the constituent particles of the matter are arranged in the random manner.

That means there is no proper arrangement of atoms in solid lattice but the atoms or molecules are closely spaced that means they can move freely from one place to another.

The examples of amorphous solid are, plastics, glass, rubber, metallic glass, polymers, gel, fused silica, pitch tar, thin film lubricants, wax.

Crystalline Solids : It is a type of solids where the constituent particles of the matter are arranged in the specific manner.

That means there is a proper arrangement of atoms in solid lattice. They do not have space between the molecules or atoms and they can not move freely from one place to another.

The examples of crystalline solids are, quartz, calcite, sugar, mica, diamonds, snowflakes, rock, calcium fluoride, silicon dioxide, alum.

7 0

3 years ago