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ruslelena [56]
3 years ago
14

What us a bond between a positive and a negative ion called

Chemistry
1 answer:
Nat2105 [25]3 years ago
6 0

Static. Is the bond if u need 2 know

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In the chemical reaction, mg + 2hcl mgcl2 + h2 how many moles of hcl are needed to completely react with 3.5 moles of mg?
Luba_88 [7]
The balanced equation for the above reaction is as follows;
Mg + 2HCl ---> MgCl₂ + H₂
stoichiometry of Mg to HCl is 1:2
number of Mg moles reacted - 3.5 mol
1 mol of Mg reacts with 2 mol of HCl 
therefore 3.5 mol of Mg requires - 2 x 3.5 = 7.0 mol of HCl 
number of HCl moles required to completely react with 3.5 mol of Mg is 7.0 mol of HCl
6 0
3 years ago
Giselle is working with a chemical substance in a laboratory. She observes that when the chemical is heated, it gives off a gas.
Phoenix [80]

The correct answer is option B, that is, hypothesis.  

A hypothesis refers to an anticipated illustration for an occurrence. It refers to a proposed illustration or a supposition made on the groundwork of inadequate proof as an initiation point for further investigation. In order for a hypothesis to be a scientific hypothesis, the scientific method needs that one can examine it.  


6 0
4 years ago
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20. Which of the following is a method of purifying water? A. Adding iodine B. Freezing C. Aeration D. Fixation
Oxana [17]
The answer is A, adding Iodine
7 0
3 years ago
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A 2 kg cat is stuck in a tree 10 m above the ground. How much GPE does it have?
Dovator [93]

Answer:

196J, but C. at 200 J comes close.

Explanation:

Potential energy due to gravity is given by:

PEgrav = mass • g • height

where g is the acceleration due to gravity.  We'll use 9.8 N/kg (on Earth).

PEgrav = mass • g • height

PEgrav = (2 kg) • (9.8 N/kg) • (10 m)

PEgrav = 196 N*m

1 N*m = 1 Joule

PEgrav = 196 J

C. at 200 J comes close.  The solution probably used a value of g equal to 10 N/kg)

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2 years ago
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3 years ago
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