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Marizza181 [45]
3 years ago
7

Who created the first compound microscope and telescope?

Chemistry
2 answers:
vesna_86 [32]3 years ago
8 0

Answer:

Janssen

Explanation:

-BARSIC- [3]3 years ago
6 0

Answer:

Hans Martens/Zacharias Janssen

Explanation:

Janssen was the son of a spectacle maker named Hans Janssen, in Middleburg, Holland, and while Zacharias is credited with inventing the compound microscope, most historians surmise that his father must have played a vital role, since Zacharias was still in his teens in the 1590s.

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How do you draw a bohr diagram for a boron ion?
Otrada [13]
Because Boron likes to lose 3 electrons when it undergoes ionization, we draw a boron ion like a helium atom, with just 2 electrons in the first shell, and 0 in the second

5 0
3 years ago
Read 2 more answers
Which of the following lends itself to the use of a descriptive method? a. Jonathan would like to develop a hypothesis regarding
Marianna [84]

Answer:

a. Jonathan would like to develop a hypothesis regarding the role of parental expression of affection in reducing toxic stress in early childhood.

Explanation:

A descriptive method is commonly known as a research method for describing the properties or features of the research area being investigated. Descriptive research is usually conducted by studying the trends of the phenomenon without changing the value of any variable in the system. Thus, the correct answer is option a.

7 0
3 years ago
Y’all pleasee answer these
AlladinOne [14]
1. b 2. B 3.c 4.a 5.a
8 0
3 years ago
The relative strengths of covalent bonds and van der Waals interactions remain the same when tested in a vacuum or in water. How
trasher [3.6K]

Answer and Explanation:

The explanation given in the problem is correct but not totally encompassing.

Van der waals interactions are a type of hydrophobic interaction, in which they do not interact with the polar water molecule. Covalent bonds involve the sharing of electrons between atoms of relatively similar electronegativities, and are most often too strong to disrupt by polar molecules of water. Therefore, covalent bonds and van der waals forces have an Intrinsic bond strength value that is independent of the environment.

However, either the partial negative oxygen atom or the partial positive hydrogen atoms in water molecules disrupt hydrogen or ionic bonds. Water is known to form hydrogen bonds with other polar or charged molecules, thus reducing the strength of interaction these molecules would normally have in the absence of water. Basically, these compounds with Hydrogen or Ionic bonds ionize, whether partially or fully in water, thereby leading to a decrease in bond strength in water.

QED!

7 0
3 years ago
The mass percentage of hydrochloric acid within a solution is 15.00%. given that the density of this solution is 1.075 g/ml, fin
Morgarella [4.7K]

Given the mass percentage of HCl solution = 15.00 %

This means that 15.00 g HCl is present in 100 g solution

Moles of HCl = 15.00 gHCl*\frac{1 mol HCl}{36.46 g HCl} =0.411molHCl

Density of the solution = 1.075 g/mL

Calculating the volume of solution from density and mass:

100 g *\frac{1mL}{1.075 g} =93.0 mL

Converting volume from mL to L:

93.0 mL * \frac{1 L}{1000 mL} =0.093 L

Calculating the molarity of HCl solution from moles and volume:

\frac{0.411 mol}{0.093 L} =4.42 mol/L

8 0
4 years ago
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