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3 years ago

True or False? Elements in the same row have similar properties. Question 4 options: True False

Chemistry

2 answers:

Natasha2012 [34]3 years ago

6 0

4. false
5. true
6.valence electrons

I took the test

Hope this helps.

Gekata [30.6K]3 years ago

3 0

1) Answer is: False.

A period in the periodic table is a horizontal row. For example, sodium and chlorine are in third period and they have very different properties. Sodium is solid metal and chlorine is gaseous nonmetal. Elements in the same row have the same number of electron shells, but different proporties.

2) Answer is: True.

Group is a column of elements in the periodic table. For example, lithium and sodium are in 1 group of the periodic table and they both have one valence electron.

3) Answer is: valence electrons.

For example, electron configuration of oxygen atom: ₈O 1s² 2s² 2p⁴.

Oxygen atom has six valence electrons, so it is in 16 group of Periodic table of elements.

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List the types of friction in order from weakest to strongest

e-lub [12.9K]

Static Friction, Sliding Friction, Rolling Friction, and finally Fluid Friction.

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3 years ago

How much heat must be transferred to 100.0g of water to change its temperature by 35° C?

nekit [7.7K]

Answer:

14700J

Explanation:

From the question given, the following were obtained:

M = 100g

ΔT = 35° C

C = 4.2J/g °C

Q=?

The heat transferred can calculated for by using the following equation

Q = MCΔT

Q = 100 x 4.2 x 35

Q= 14700J

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3 years ago

If 10.0 moles of O₂ are reacted with excess NO in the reaction below, and only 4.2 mol of NO₂ were collected, then what is the p

jonny [76]

Answer:

Percent yield = 21%

Explanation:

Find:

Percent yield

Computation:

1 mol O₂ produces 2 mol NO₂

So,

10 mol O₂ produces 20 mol NO₂

Percent yield = [Actual yield / Theoretical yield]100

Percent yield = [4.2 / 20]100

Percent yield = 21%

5 0

3 years ago

Which of the following materials is not considered to be a semiconductor? germanium tin silicon aluminum

Aleksandr [31]

Tin and Aluminum are not considered as semiconductors but rather conductors themselves because they are metals. <span>Semiconductors are in general elements from column IV or or compounds of columns III and V of the periodic table.</span>

Germanium and silicon are semiconductors because they are metalloids.

6 0

3 years ago

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Complete the first row in the table by filling in the missing information about a system at equilibrium.

enot [183]

Answer:

$Q= K_{eq}$

Explanation:

Equilibrium system: It is defined as that condition when the rate of forward reaction is equal to rate of backward reaction.

It is also defined as that condition concentration of reactantsx and concentrations of products are constant .

Suppose a reaction

$aA+bB\leftrightharpoons cC+dD$

Equilibrium constant, $K_c=\frac{concentartion\;of\;products}{concentration;of;reactants}$

Equilibrium constant, $K_c=\frac{C^c\cdot D^d}{A^a\cdot B^b}$

When the reaction is not in equilibrium then reaction constant

$Q_c=\frac{C^c\cdot D^d}{A^a\cdot B^b}$

When the reaction is in equilibrium then the equilibrium constant is equal to reaction constant

Hence, $Q = K_c$

When Q < K then the concentrations of reactants are greater than the concentrations of products.

When Q > K then the concentrations of products are greater than the concentration of reactants.

Answer : $Q= K_{eq}$

3 0

3 years ago

Read 2 more answers