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3 years ago

What is common to all elements in the same group in the periodic table?

2 answers:

5 0

C is the correct answer. Elements in the periodic table are grouped based on having similar properties. For example, the noble gases are all non-reactive and non-metallic. The electronic structure of an atom is the way the electrons are arranged within it, and this affects where they are located in the periodic table. The number of electrons in an element is the same as its group number in the periodic table (with the exception of Group 0).

zvonat [6]3 years ago

3 0

Your answer would be, C.

They have the same number of outer electrons!

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A green laser pointer emits light with a wavelength of 536 nm. What is the frequency of this light?

anastassius [24]

Answer:

Your answer is 5.63 × 10^14 Hz

We know the value of the speed of light and we are given the wavelength. All we have to do is rearrange the equation to solve for the frequency:

frequency: v = c/ λ

Now just plug in the given values:

v = 3.00 × 10 ^ 8 / 530 × 10^-9

v = 5.66 × 10 ^ 14 Hz

I hope this helps you.

3 0

3 years ago

Carbon-14 is a radioactive isotope that decays according to first-order kinetics in a process that has a half-life of 5730 years

Sliva [168]

Answer : The time passed in years is $2.83\times 10^3\text{ years}$

Explanation :

Half-life = 5730 years

First we have to calculate the rate constant, we use the formula :

$k=\frac{0.693}{t_{1/2}}$

$k=\frac{0.693}{5730\text{ years}}$

$k=1.21\times 10^{-4}\text{ years}^{-1}$

Now we have to calculate the time passed.

Expression for rate law for first order kinetics is given by:

$t=\frac{2.303}{k}\log\frac{a}{a-x}$

where,

k = rate constant = $1.21\times 10^{-4}\text{ years}^{-1}$

t = time passed by the sample = ?

a = let initial amount of the reactant = X g

a - x = amount left after decay process = $71\% \times (x)=\frac{71}{100}\times (X)=0.71Xg$

Now put all the given values in above equation, we get

$t=\frac{2.303}{1.21\times 10^{-4}}\log\frac{X}{0.71X}$

$t=2831.00\text{ years}=2.83\times 10^3\text{ years}$

Therefore, the time passed in years is $2.83\times 10^3\text{ years}$

8 0

3 years ago

A substance that gives up a proton during a chemical reaction, raising the hydrogen ion concentration of water, is most appropri

AleksandrR [38]

The answer is an acid.

That is a substance that gives up a proton during a chemical reaction, raising the hydrogen ion concentration of water, is most appropriately called an acid.

Acid is a substance that gives protons in its aqueous solution, and that the hydrogen ion concentration of that aqueous solution .

6 0

4 years ago

Read 2 more answers

A student performs the following experiment.

dybincka [34]

Answer:

Two different changes have occurred in the beaker. The description of the step 1 suggests that most likely a chemical change has occured while the description of the step 2 correspond to a physical change.

Explanation:

When the mixture of two liquid colorless substances results in the appearance of solid particles you first thing in the appareance of a new substance. If this is the case, it means that the original substances reacted chemically to form a new product, so this is a chemical change.

On the other hand, the second step describes just a physical change as it has been just that the yellow particles settled and then a physical separation by decantation. Decantation does not change the chemical properties of the particles settled, they are jsut separeated from the liquid. During this step both the yellow particles and the liquid in the beaker keep their chemical properties, so this is just a physical change.

4 0

3 years ago

Read 2 more answers

so they are asking me to find the empirical formula for a compound that is 7.70% carbon and 92.3% chlorine. Can you show me step

Nikolay [14]

Answer:

Empirical formula is CCl₄

Explanation:

Given data:

Percentage of carbon = 7.70%

Percentage of chlorine = 92.3%

Empirical formula = ?

Solution:

Number of gram atoms of Cl = 92.3 / 35.5 = 2.6

Number of gram atoms of C = 7.70 / 12 = 0.64

Atomic ratio:

C : Cl

0.64/0.64 : 2.6/0.64

1 : 4

C : Cl = 1 : 4

Empirical formula is CCl₄.

5 0

4 years ago