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lubasha [3.4K]
3 years ago
13

Many gardeners add earthworms to their soil if none are already living there. Why would gardeners do this?

Chemistry
1 answer:
Ksenya-84 [330]3 years ago
8 0
The correct answer is D, earthworms eat the dirt, and then release it into the soil. They turn the dirt and soil into fertilizer so to speak. Worms also leave holes in the ground, which is good for water and air for the plants roots, but that isn't an option.
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Elements in group via (group 16) have similar properties because they all have __________.
Ksivusya [100]
They all have 2 elections in the outer S orbital, and 4 electrons in the P orbitals.
6 0
3 years ago
Read 2 more answers
Match the following items. Match the items in the left column to the items in the right column. 1. general or nonspecific observ
ivann1987 [24]
when column B is like the attached pic: (missing in your question)

so the matches will be like that:

1- Qualitative :

as Qualitative is a general or nonspecific observation, they also don't require

measurements and even can't be measured, that is because of the reality is

being approximated only. It  describes qualities and uses opinion

2- Hypothesis : 

as a hypothesis is an educated guess quantitative, and it is a prediction stated

in " If and then " form. a hypothesis to be valid need a research such as:

-Encyclopedia & state and local research facilities & scientific journals.

3- Direct relationship:

as a Direct relationship is when two variable change in the same direction,

and one remaining larger than the other by the same factory.  

- this is a type of a relationship in which there is a change with one variable, and corresponding with the change in the other. and because this corresponding change with the other variable in the same direction so it refers to a positive relationship. 

4- Quantitative:

as Quantitative is a measured observation, It's an information or data based

on quantities obtained. And using numbers, equipment and standard units.

5- Control :

as control is standard, reference data or experiment qualitatively. this is what

you compare your experimental results to. This is for comparing results, it

used as a standard for comparison and use baseline measurements to use in

the comparing.

6- Theory :

 as Theory is a presently accepted explanation of how something happened.

 Scientifically acceptable general principles to explain phenomena. It the

general or abstract principles of the science. for example the  wave theory of

light.

7- Law :

as a law is a statement that explains what something does under the same

conditions. when we take about law in science, it is a general rule to explain

the observations in the form of a mathematical statement. Scientific law may 

be stated in words or expressed as a mathematical equations.

8- Best fit curve:

as best fit curve is a curve drawn to average the data's deviations direct

relationship. It is a process of constructing a curve that has best fit to a

series of data points. 

7 0
3 years ago
Write the IUPAC substitutive name of the major product when 2-methylbut-1-ene reacts with: a) HCl b) HBr in the presence of pero
aleksandr82 [10.1K]

Answer and Explanation:

The IUPAC substitutive name of the major product when 2-methylbut-1-ene reacts are as follows

a) HCl = 2-chloro-2-methylbutane

b) HBr in the presence of peroxides =  1-bromo-2-methylbutane

c) H2O/ H2SO4 (dilute sulfuric acid)  = 2-methylbutane-1,2-diol

d)BH3-THF followed by basic hydrogen peroxide =  2-methylbutan-1-ol

e) Chlorine in water =  2-chloro-2-methylbut -1 -ol

f) Bromine in carbon tetrachloride =  1,2- dibromo-2-methybutane

g) H2 in the presence of a metal catalys = isopentane or 2- methyl butane

8 0
3 years ago
3 difference between Homogeneous mixture and Heterogeneous Mixture​
miv72 [106K]

Answer:

Difference between Homogeneous mixture and Heterogeneous Mixture are as follows:

  • A mixture or sample that is consist of uniform composition and properties is called a homogeneous mixture while a mixture or sample that is consist of different composition and properties is called a heterogeneous mixture.
  • Homogenous mixture has only single phase while heterogeneous mixture has  two or more phases.
  • Homogenous mixture can not be separated by physical methods while heterogeneous mixture can be separated out physically.
  • Example of homogenous mixture is Water and sugar and heterogeneous mixture is oil and water.

7 0
3 years ago
If the solubility of a gas in water is 5.0 g/L when the pressure of the gas above the water is 2.5 atm, what is the pressure of
OLga [1]

Answer:

0.5 atm.

Explanation:

  • Henry’s law states that the amount of a gas dissolved in a  solution is directly proportional to the  pressure of the gas above the solution
  • We should use Henry’s law: <em>P = KC,</em>

where, P is the partial pressure of the  gaseous solute above the solution.

k is a constant.

C is the concentration of the  dissolved gas.

<em>At two different pressures:</em>

<em>P₁C₂ = P₂C₁,</em>

P₁ = 2.5 atm, C₁ = 5.0 g/L.

P₂ = ??? atm, C₂ = 1.0 g/L.

<em>∴ P₂ = P₁C₂/C₁</em> = (2.5 atm)(1.0 g/L)/(5.0 g/L) = <em>0.5 atm.</em>

5 0
3 years ago
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