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Dmitry_Shevchenko [17]
2 years ago
6

What factors affect the vegetation of a place?

Chemistry
1 answer:
ale4655 [162]2 years ago
7 0

Answer:

climate ,soils,nature of the surface and man

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Give the number of protons, neutrons and electrons in 99Tc
miss Akunina [59]

Explanation:

Tc - 99 is technetium 99.

It is a radioactive element that decays spontaneously. It has a half-life of 211,000 years and decays to stable ruthenium.

  • On the periodic table, it has an atomic number of 43;

Mass number  = 99

Atomic number = number of protons = number of electrons in atom

  Number of protons in Tc is 43

                      electron is 43

Mass number = number of protons + number of neutrons

  Number of neutrons = mass number - number of protons = 99-43 = 56

learn more:

Atomic number brainly.com/question/2057656

#learnwithBrainly

5 0
3 years ago
Min : sec helium and nickel are classified as _____, which are pure substances that make up all kinds of matter
Sidana [21]

Helium which has a chemical formula of He is considered as a noble gas while Nickel which has a chemical formula of Ni is considered as metallic. Although both have different phases but they are both classified under the general category of “Elements”.

 

answer:

<span>elements</span>

4 0
3 years ago
Si Units Worksheet. Use si units to complete
Keith_Richards [23]

\\ \bull\tt\dashrightarrow 2000m=2km

\\ \bull\tt\dashrightarrow 9000mL=9L

\\ \bull\tt\dashrightarrow 6L=6000mL

\\ \bull\tt\dashrightarrow 6cm=60mm

\\ \bull\tt\dashrightarrow 1000m=1km

\\ \bull\tt\dashrightarrow 50mm=5cm

\\ \bull\tt\dashrightarrow 4L=4000mL

\\ \bull\tt\dashrightarrow 10000g=10kg

\\ \bull\tt\dashrightarrow 10000m=10km

\\ \bull\tt\dashrightarrow 4000g=4kg

\\ \bull\tt\dashrightarrow 9km=9000m

\\ \bull\tt\dashrightarrow 3kg=3000g

\\ \bull\tt\dashrightarrow 90mm=9cm

\\ \bull\tt\dashrightarrow 4km=4000m

\\ \bull\tt\dashrightarrow 2000g=2kg

\\ \bull\tt\dashrightarrow 400cm=4m

\\ \bull\tt\dashrightarrow 3km=3000m

\\ \bull\tt\dashrightarrow 2cm=20mm

\\ \bull\tt\dashrightarrow 9000g=9kg

8 0
2 years ago
How to test for carbon dioxide ​
Kaylis [27]

Answer:  carbon dioxide detector

6 0
2 years ago
Read 2 more answers
The instructions for the experiment direct you to prepare 30 mL of 1.5 M HCl solution. In the chemical closet, you locate an 18M
MAVERICK [17]

The volume of the 18M HCl needed to make the solution will be 2.5 mL.

<h3>Dilution</h3>

According to the dilution principle, the number of moles of solutes in a solution before and after dilution must remain the same.

Since, mole = molarity x volume

Thus, molarity x volume before dilution = molarity x volume after dilution.

Mathematically, the equation is written as: m1v1 = m2v2

In this case, m1 = 18 M, m2 = 1.5 M, and v2 = 30 mL.

What we are looking for is v1, the amount of the stock HCl needed for dilution.

v1 = m2v2/m1 = 1.5 x 30/18 = 2.5 mL.

Thus, 2.5 mL of the stock HCl would be needed.

More on dilution can be found here: brainly.com/question/21323871

#SPJ1

6 0
1 year ago
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