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sukhopar [10]
3 years ago
5

Which statements are correct about silicon?

Chemistry
1 answer:
ki77a [65]3 years ago
4 0

Answer:

A. Metalloid

E. Has similar properties as Ge

F. Belongs to Period 3​

Explanation:

Silicon is the 14th element on the periodic table. Its unit is SI. Its properties straddles between those of metals and non-metals and it is described as a non-metal.

It's atomic weight or mass number is 28u. It has an atomic number of 14 i.e in its neutral state, the number of protons and electrons are equal to 14.

Silicon belongs to the 4th group and the 3rd period on the periodic table. Elements in the same group share similar chemical properties. The elements in Si group are: C, Ge, Sn and Pb. The properties of Si is similar to these elements because they all have a valency of 4. Across the period, the properties varies this is why Si would have a very different property from Al and P.

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In a titration experiment 12.5 ml of 0.500 m h2so4 neutralized 50.0 ml of naoh. the concentration of the naoh solution is ____.
s344n2d4d5 [400]

0.250 mol/L

<em>Step 1</em>. Write the chemical equation

H2SO4 + 2NaOH → Na2SO4 + 2H2O

<em>Step 2</em>. Calculate the moles of H2SO4

Moles of H2SO4 = 12.5 mL H2SO4 × (0.500 mmol H2SO4/1 mL H2SO4)

= 6.25 mmol H2SO4

<em>Step 3</em>. Calculate the moles of NaOH

Moles of NaOH = 6.25 mmol H2SO4 × (2 mmol NaOH/(1 mmol H2SO4)

= 12.5 mmol NaOH

<em>Step 4</em>. Calculate the concentration of the NaOH

[NaOH] = moles/litres = 12.5 mmol/50.0 mL = 0.250 mol/L

4 0
3 years ago
Which of the following is a disadvantage of genetic engineering?
Solnce55 [7]

Answer:

A disadvantage is pharmaceuticals

Explanation:

4 0
3 years ago
When comparing plant and animal cells which statement is least accurate?
IrinaK [193]
Here is a diagram comparing both plant and animal cells.
Hope it helps:)

8 0
3 years ago
Read 2 more answers
Can someone help me with this?
Aleks [24]
I think you pressed the right one
3 0
3 years ago
A 4.70 g of a C.H. compound was combusted in air to make 15.3 g of CO, and 4.70 g H.O. What is the empirical formula? Balance th
34kurt

Answer:

The empirical formula is C₂H₃

Explanation:

The empirical formula of a chemical compound is defined as the simplest positive integer ratio of atoms present in a compound.

The reaction of combustion for a CₐHₓ is:

CₐHₓ + (a+x/4) O₂ → a CO₂ + ˣ/₂ H₂O

The moles obtained are

15,3 g of CO₂ × \frac{1mol}{44,01g} = 0,3476 moles of CO₂≡moles of C

4,70 g of H₂O × \frac{1mol}{18,02g} = 0,2608 moles of H₂O × 2 = 0,5216 moles of H.

The ratio H:C is 0,5216/0,3476= 1,5. That means you have 1,5 H per 1C, that is the same than 3H per 2C. Thus, empirical formula is:

C₂H₃

I hope it helps!

6 0
3 years ago
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