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dimaraw [331]
4 years ago
8

______and_____are examples of pure substances.

Chemistry
1 answer:
antiseptic1488 [7]4 years ago
6 0
Pure substances are either elements or compounds.
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An area experiences lack of moisture and precipitation. It also experiences high temperature and winds. Which severe weather eve
ddd [48]

Answer:

Drought

Explanation:

It would get really dry because no moisture and the lakes would dry up bc of lack of water

6 0
3 years ago
a 150 g sample of water (initially at 45 C) is mixed with an unknown mass of water (initially at 84 C). the final temperature of
Evgesh-ka [11]

Answer : The unknown mass of water is, 200.3 grams.

Explanation :

In this problem we assumed that heat given by the hot body is equal to the heat taken by the cold body.

q_1=-q_2

m_1\times c_1\times (T_f-T_1)=-m_2\times c_2\times (T_f-T_2)

As,

c_1=c_2 = specific heat water

So,

m_1\times (T_f-T_1)=-m_2\times (T_f-T_2)

where,

m_1 = mass of water = 150 g

m_2 = mass of unknown water  = ?

T_f = final temperature of mixture = 67.3^oC

T_1 = initial temperature of water = 45^oC

T_2 = initial temperature of unknown water = 84^oC

Now put all the given values in the above formula, we get

150g\times (67.3-45)^oC=-m_2\times (67.3-84)^oC

m_2=200.3g

Therefore, the unknown mass of water is, 200.3 grams.

3 0
3 years ago
What happens when carbon dioxide gas is cooled to -78 degree Celsius​
katrin2010 [14]

Answer:

At temperatures below −78 °C, carbon dioxide changes directly from a gas to a white solid called dry ice through a process called deposition.

3 0
2 years ago
Hii pls help me with this ionic equation ​
slava [35]

Answer:

net ionic equation

\boxed{  CaCO_3{}_{(s)} + 2H^{+} {}_{(aq.)} \rightarrow Ca^{2+} {}_{(aq.)} + H_2O_{(l)} + CO_2{}_{(g)} }

3 0
3 years ago
Type the correct answer in the box. Spell all words correctly. In which system are both energy and matter exchanged with the sur
Anna11 [10]

Answer:

open system

Explanation:

An open system is a system in which both energy and matter are exchanged with the surroundings.

4 0
3 years ago
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