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3 years ago

HELP ME WITH QUIZ PLEASEEEE

Chemistry

2 answers:

Mekhanik [1.2K]3 years ago

7 0

Answer:

Explanation:

Westkost [7]3 years ago

5 0

A. atmosphere. I may be wrong, but I was looking it up and the moon has an exosphere, not an atmosphere.

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Determine the energy change in the following reaction. This reaction is considered ...

Juliette [100K]

Answer:isothermic

Explanation:

8 0

2 years ago

Read 2 more answers

I'd really appreciate help- this is due in around 8 hours :"D

Fed [463]

Answer:

atomic #= 1

protons equals one
Number of neutrons equals to 0
number of electrons equal to 1
mass number equals to 1

atomic number equals to 1
Protons equals to 1
number of neutrons equals to 0
number of electrons equals to 0 because the plus sign means that it loses an electron
mass number equals to 1

atomic number 17
number of protons 17
number of neutrons 18
number for electrons 18 Because negative sign means It's an anion which means it gains an electron
mass number 35

12
12
12
10 loses 2 its a cation
24

47
47
108-47 = 61
46 loses 1
108

16
16
32-16 =16
18 it gains 2 electrons
32

there u go

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2 years ago

An amphoteric species is neither an acid nor a base. True or False

umka2103 [35]

Answer: False

Explanation: just took on edge

8 0

3 years ago

if an element has an atomic mass of 127 and an atomic number of 53, how many neutrons does it have? 74 127 53 75

nadya68 [22]

74 is the answer u find it by subtracting the protons(atomic number) from atomic mas, so basically... 127-53 =74 neutrons

7 0

3 years ago

A solution is saturated in CO2 gas and KNO3 at room temperature. What happens when the solution is warmed to 75°C?

nignag [31]

Answer:

gaseous CO2 bubbles out of the solution

Explanation:

We already know that the dissolution of a gas in water is exothermic. Hence, when the temperature of a solution containing a gas is increased, the solubility of the gas decreases and the gas bubbles out of the solution.

Similarly, the dissolution of KNO3 in water is endothermic. This implies that the solubility of the solid increases with increasing temperature.

Thus the solid becomes more soluble at 75°.

6 0

3 years ago