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Korolek [52]
3 years ago
6

[03.01]Victoria is studying the periodic table of elements and notices that several trends exist. Which of the following stateme

nts could she correctly make regarding elements in the same group in the periodic table? A=They have similar names B= They have decreasing atomic mass C=They have similar chemical properties. D=They have the same number of protons.
Chemistry
1 answer:
antoniya [11.8K]3 years ago
5 0
B would work. Get out a periodic table and check if you need too
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Describe the steps used to create Lewis dot structures to represent covalent bonds.
antiseptic1488 [7]
1)Identify the atoms that are participating in a covalent bond.
2)Draw each atom by using its element symbol. The number of valence electrons is shown by placing up to two dots on each side of the element symbol, with each dot representing a single valence electron.
3)Predict the number of covalent bonds each atom will make using the octet rule.
4)Draw the bonding atoms next to each other, showing a single covalent bond as either a pair of dots or a line representing a shared valence electron pair. If the molecule forms a double or triple bond, use two or three lines to represent the shared electron pairs, respectively.

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4 years ago
Before the Internet, it was easier for small businesses to do business on a global scale. Choose the answer.
Umnica [9.8K]
I think it’s false ......
8 0
3 years ago
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A second-order reaction has a rate constant of 1.25 M-1 s-1. If the initial reactant concentration is 1.0 M (a) determine the ha
Ne4ueva [31]

Answer:

(a) 0.8 s

(b) t = 7.2 s

Explanation:

(a) Half life expression for second order kinetic is:

t_{1/2}=\frac{1}{k[A_o]}

Where,

[A_o] is the initial concentration = 1.0 M

k is the rate constant = 1.25 M⁻¹s⁻¹

So,

t_{1/2}=\frac{1}{1.25\times 1.0}

Half life = 0.8 s

(b) Integrated rate law for second order kinetic is:

\frac{1}{[A_t]} = \frac{1}{[A]_0}+kt

Where, [A_t] is the final initial concentration

For 90% completion, 10% is left. so,

[A_t]=\frac {10}{100}\times 1.0=0.1\ M

So,

\frac{1}{0.1} = \frac{1}{1.0}+1.25t

t = 7.2 s

8 0
3 years ago
Hydrogen gas and oxygen gas combine according to this reaction: 2H2(g]+O2(g]→2H2O(l]At STP, a chemist mixes 3.74 L of hydrogen g
zavuch27 [327]

Answer:

1.47 Liters of O₂ were reacted

Explanation:

The reaction is:

2H₂ (g) + O₂(g) → 2H₂O(l)

As we have the volume of hydrogen we need to work with denstiy to determine the moles that have reacted.

Density = mass / volume

Density . volume = mass → 0.071 g/L . 3.74L = 0.265 g

We determine the moles of H₂ → 0.265 g. 1mol/2g = 0.132 moles

In the reaction, ratio is 2:1. We make a rule of three:

2 moles of H₂ need 1 mol of O₂ to react

Then, 0.132 moles would need (0.132 .1)/2 = 0.066 moles of O₂

In order to determine the volume we need the oxygen's density but, we have to convert the mass to moles, firstly.

0.066 moles . 32 g/ 1mol = 2.12 g

Then oxygen's density = oxygen's mass / oxygen's volume

Oxygen's volume = oxygen's mass / oxygen's density

O₂ volume = 2.12 g / 1.43 g/L = 1.47 L

5 0
3 years ago
Read 2 more answers
PLEASE HELP AGAIN lol thank you :))
Annette [7]
BBBBBBBBBBBBBBBBBBBBBBBBBBBBB
8 0
3 years ago
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