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3 years ago

Which two characteristics do all flowering plants have in common?

Chemistry

1 answer:

Mamont248 [21]3 years ago

4 0

Answer: They have vessels, and produce seeds.

Explanation: Flowering plants have vascular tissue and use seeds to reproduce.

You might be interested in

A mole is most similar to?

jeka57 [31]

A mole is most similar to Avogadro's number -
6.02 x 10^23

5 0

3 years ago

Write a short story in about 150 to 200 words based on the image given below

antoniya [11.8K]

Dude, writing someone else’s story or essay isn’t allowed, so i’ll just give some pointers

so the dude on the throne, a monarch, most likely the king, has a diamond or some other precious object in his hand. meanwhile, there’s a dude sitting on the floor, he looks unhappy, distressed, and maybe a little surprised. so what do you think happened to get to this point? what or who gave the king the diamond? why is the dude on the floor upset? then what’s going to happen? what’s the upset dude gonna
do? what’s the king gonna do? think of answers to the questions and it should start to form

6 0

3 years ago

238 U 92 write the following decay sequence.

Vladimir [108]

Answer: The given decay sequence is $^{238}_{92}U \rightarrow ^{234}_{90}Th + ^{4}_{2}He \rightarrow ^{234}_{91}Pa + ^{0}_{-1}\beta$ .

Explanation:

An alpha-particle is a helium atom. Hence, when an alpha decay occurs in $^{238}_{92}U$ then the reaction equation is as follows.

$^{238}_{92}U \rightarrow ^{234}_{90}Th + ^{4}_{2}He$

Now, in sequence the equation for beta decay is as follows.

$^{234}_{90}Th \rightarrow ^{234}_{91}Pa + ^{0}_{-1}\beta$

Hence, the sequence will be as follows.

$^{238}_{92}U \rightarrow ^{234}_{90}Th + ^{4}_{2}He \rightarrow ^{234}_{91}Pa + ^{0}_{-1}\beta$

Thus, we can conclude that the given decay sequence is $^{238}_{92}U \rightarrow ^{234}_{90}Th + ^{4}_{2}He \rightarrow ^{234}_{91}Pa + ^{0}_{-1}\beta$ .

4 0

3 years ago

How to know whether something is an "atom" or not? for example

Karolina [17]

A normal atom has a neutral charge with equal numbers of positive and negative particles. That means an atom with a neutral charge is one where the number of electrons is equal to the atomic number. Ions are atoms with extra electrons or missing electrons.

Butane is a straight chain alkane composed of 4 carbon atoms. It has a role as a food propellant and a refrigerant. It is a gas molecular entity and an alkane.

6 0

3 years ago

У 2грамах воднню скільки молекул і скільки атомів<br>

Alekssandra [29.7K]

In 2 g H₂ there are 6,023.10²³ molecules H₂ and 2 x 6,023.10²³ atoms H

<h3>Further explanation </h3>

The mole is the number of particles contained in a substance

1 mol = 6.02.10²³

Moles can also be determined from the amount of substance mass and its molar mass

The question is :

<em>in 2 grams of hydrogen how many molecules and how many atoms</em>

mol of Hydrogen - H₂

MW H₂ = 2.01568 u (2 atoms of H)

MW H = 1.00784 u

$\tt mol=\dfrac{m}{MW}\\\\mol=\dfrac{2~g}{2.01568 u}=0.992$

number of molecules

$\tt 0.992\times 6.02\times 10^{23}=5.97\times 10^{23}$

mol of H

$\tt mol=\dfrac{2}{1.00784}= 1.984$

number of atoms

$\tt 1.984\times 6.02\times 10^{23}=11.94\times 10^{23}$

Or a simply way :

1 g of H atoms = 1 mol of H (MW H = 1 g/mol)

2 g of H atoms (in 2 gr H₂) = 2 moles of H

2 g of H₂ molecules = 1 mole of H₂ (MW H₂=2 g/mol)

so in 2 g H₂ there are 6,023.10²³ molecules H₂ and 2 x 6,023.10²³ atoms H

4 0

3 years ago