All categories

3 years ago

In what order did mendeleev arrange the elements in his periodic table?

1 answer:

3 0

He realized that the physical and chemical properties of elements were related to their atomic mass in a 'periodic' way, and arranged them so that groups of elements with similar properties fell into vertical columns in his table.

You might be interested in

A 250mL sample of air at STP contains approximately 52.5mL of O2. What is the percentage of oxygen in the air

RSB [31]

Yessirrrrrrr wee litttttttt sirrrrr

4 0

3 years ago

A(n) __________ eclipse might occur when the Earth, Moon, and Sun are in the positions shown in the picture.

zheka24 [161]

Answer:

The answer is most likely D

3 0

3 years ago

Read 2 more answers

_Al(NO3)3 +_(NH4)3 P04_AlPO4+_ NH, NO3 balancing equations

astra-53 [7]

Answer:

Al(NO₃)₃ + (NH₄)₃PO₄ —> AlPO₄ + 3NH₄NO₃

The coefficients are: 1, 1, 1, 3

Explanation:

__Al(NO₃)₃ + __(NH₄)₃PO₄ —> __AlPO₄ + __NH₄NO₃

The above equation can be balance as illustrated below:

Al(NO₃)₃ + (NH₄)₃PO₄ —> AlPO₄ + NH₄NO₃

There are 12 atoms of H on the left side and 4 atoms on the right side. It can be balance by writing 3 before NH₄NO₃ as shown below:

Al(NO₃)₃ + (NH₄)₃PO₄ —> AlPO₄ + 3NH₄NO₃

Now the equation is balanced.

The coefficients are: 1, 1, 1, 3

4 0

3 years ago

Convert 48,987 minutes to years using the method of dimensional analysis

mixas84 [53]

Answer:

Explanation:

48000 minutes [ 1 hour / 60 min ] 1 day / 24 hours ] [365 days / year]

48000 * [ 1/(60 * 24 * 365)]

48000 * [1 / 525600]

There are 0.0930954years in 48000 minutes

6 0

3 years ago

Lithium diorganocopper (Gilman) reagents are prepared by treatment of an organolithium compound with copper(I) iodide. Decide wh

Ann [662]

Answer:

See explanation and image attached

Explanation:

The Gilman reagent is a lithium and copper (diorganocopper) reagent with a general formula R2CuLi. R is an alkyl or aryl group.

They are useful in the synthesis of alkanes because they react with organic halides to replace the halide group with an R group.

In this particular instance, we intend to synthesize propylcyclohexane. The structure of the lithium diorganocopper (Gilman) reagent required is shown in the image attached to this answer.

7 0

3 years ago