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2 years ago

Which element comes from the greek word zinke?

Chemistry

2 answers:

Novay_Z [31]2 years ago

8 0

Answer:

Zinc

The element was probably named by the alchemist Paracelsus after the German word Zinke (prong, tooth).

Explanation:

Neporo4naja [7]2 years ago

5 0

Answer: Zinc

Explanation: The element was probably named by the alchemist Paracelsus after the German word Zinke (prong, tooth).

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If nitrogen-13 has a half life of 2.5 years, how much remains from a 100g sample after 7.5 years

Sonbull [250]

Answer:

12.50g

Explanation:

T½ = 2.5years

No = 100g

N = ?

Time (T) = 7.5 years

To solve this question, we'll have to find the disintegration constant λ first

T½ = In2 / λ

T½ = 0.693 / λ

λ = 0.693 / 2.5

λ = 0.2772

In(N/No) = -λt

N = No* e^-λt

N = 100 * e^-(0.2772*7.5)

N = 100*e^-2.079

N = 100 * 0.125

N = 12.50g

The sample remaining after 7.5 years is 12.50g

5 0

3 years ago

Covalent compounds occur------

irga5000 [103]

Answer:

Only between nonmetals

Explanation:

Covalent compounds are compounds that are formed as a result of covalent bonding between nonmetal atoms.
Covalent compounds occur only between non metals, where atoms of the nonmetals involved join to form a covalent bond as a result of sharing of electrons.
Electrons shared during the formation of covalent bond, may be from one atom involved or each atom contributing equally to the bond formation.
An example of covalent compounds include, phosphorus (v) oxide, methane, water, CO2,etc.

4 0

2 years ago

Describe how chemistry is a part of your life morning routine?

Maksim231197 [3]

When you wake up early, and go brush your teeth the toothpaste is made of chemical compounds, the water that you use to wash your faceis treated chemically. To make the coffee sugar or sweetener has chemical compounds.

6 0

3 years ago

chemistry student needs of thiophene for an experiment. She has available of a w/w solution of thiophene in carbon tetrachloride

kumpel [21]

The question is incomplete, here is the complete question:

A chemistry student needs 75 g of thiophene foran experiment. He has available 0.50 kg of a 29.3% w/w solution of thiophene in carbon tetrachloride.

Calculate the mass of solution the student should use. If there's not enough solution, press the "No solution" button.

Answer: The mass of solution the student should use is 255.97 grams

Explanation:

We are given:

Mass of thiophene needed = 75 gram

29.3 % w/w thiophene solution

This means that 29.3 grams of thiophene is present in 100 grams of solution

Applying unitary method:

If 29.3 grams of thiophene is present in 100 grams of solution

So, 75 grams of thiophene will be present in = $\frac{100}{29.3}\times 75=255.97g$

Given amount of solution = 0.50 kg = 500 grams (Conversion factor: 1 kg = 1000 g)

Hence, the mass of solution the student should use is 255.97 grams

4 0

3 years ago

Calculate the percent by mass of each element in

Ronch [10]

Answer:

See below in bold.

Explanation:

Nitrogen, Hydrogen and Oxygen are the elements present in ammonium nitrate.

The Molar Mass = 2N + 4H + 3 O

= 2*14.007 + 4*1.008 + 3*15.999

= 80.043.

Percentage of Nitrogen = (2 * 14.007) * 100 / 80.043

= 35.00 %.

Percentage of Hydrogen = (4* 1.008) * 100 / 80.043

= 5.04%.

Percentage of Oxygen = (3 * 15.999) * 100 / 80.043

= 59.96 %.

6 0

3 years ago

Read 2 more answers