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morpeh [17]
3 years ago
6

A chemist is looking at an electrically neutral atom that has three valence electrons. If she knows the element is a metalloid,

which one (or ones) is it?
Chemistry
1 answer:
Rus_ich [418]3 years ago
8 0
Your answer is boron,

I looked at the periodic table, there is nothing else that falls under this specs.


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A student determined the heat of fusion of water to be 88 calories per gram if the accepted value is 80 calories per gram, what
zimovet [89]
The answer is 10%

The percent error is used to determine the precision of calculations. It can be expressed as:
e =  \frac{v-v_{1} }{v_1} *100
where:
e - the percent error,
v - experimental value (measured value),
v₁ - theoretical value,

It is given:
e = ?
v = 88 calories
v₁ = 80 calories

Thus, the percent error is:
e =  \frac{88-80}{80}*100 =  \frac{8}{80}*100=0.1*100=10%
4 0
3 years ago
List 4 things that can affect the rate of reaction during a chemical reaction.
laiz [17]

Answer:

Reactant concentration, the physical state of the reactants, and surface area, temperature, and the presence of a catalyst are the four main factors that affect reaction rate.

Explanation:

6 0
3 years ago
The enthalpy of vaporization of water is 2,257,000 J/kg. If I have a 1 kg sample, how much energy is needed to boil all of it
worty [1.4K]

Answer:

2257000 J

Explanation:

Applying,

Q = Cₓm.................. Equation 1

Where Q = amount of energy need to boil the water, Cₓ = Enthalpy of vaporization of water, m = mass of water.

From the question,

Given: Cₓ = 2257000 J/kg, m = 1 kg

Substitute these values into equation 1

Q = 2257000×1

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Hence the energy needed to boil all of the water is 2257000 J

8 0
3 years ago
How many moles of mgci2 are there in 332 g of the compound
Agata [3.3K]
Find molar mass of MgCl2 so M=<span>95.211 g/mol
N=m/M 
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N=3.487
dont forget to round your sig figs </span>
3 0
3 years ago
3.87 moles of iron bromide yielded10.4 moles of sodium bromide
Roman55 [17]

Answer: 89.57 %

<em>Hope it helps</em>

7 0
4 years ago
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