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VARVARA [1.3K]
3 years ago
8

A student will measure and record the growth of two flowering plants every day for 28 days. Plant A will be watered and fertiliz

ed, Plant B will only be watered. The student predicts fertilizer added to the soil leads to taller flowering plants. Scientific conclusions are based on scientific evidence, what evidence would support the student’s prediction? A) Plant A and Plant B both die B) Plant A grows taller than Plant B C) Plant B grows taller than Plant A D) Plant A and Plant B grow to the same height
Chemistry
2 answers:
mestny [16]3 years ago
5 0
The conclusion that would support the students prediction is B) Plant "A" grows taller than Plant "B".
If the student thinks that adding fertilizer to the plant would help it grow then answer B) would make the most sence.
Jlenok [28]3 years ago
4 0

Answer:

The correct answer will be option-B

Explanation:

In the given question, the experiment was performed to test "if adding the fertilizer will increase the growth of plants" in terms of height and measured the height of the plants.

The experimental group (plant A) was provided with the water and fertilizer whereas the control group (plant B) was provided only water and the height of the plant was recorded which showed that experimental group showed more height.

This can be explained as the fertilizer adds the nutrients to the soil which the plants lack and since the plants get enough amount of fertilizer. Thus, Plant A grows taller than plant  B.

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An unknown metal sulfate is found to be 72.07% SO4 2- by mass. Assuming that the charge on the metal cation is +3, determine the
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Lets name the unknown metal as M. Cation would be M³⁺.
the molecular formula of the compound is M₂(SO₄)₃
the mass of one mole - (molar mass of M x2 + 3 x molar mass of SO₄²⁻)
                                   = 2M + 96 x 3
                                   = 2M + 288
In 1 mol if there's 72.07% of sulphate , 
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               1 % is then      - 288/72.07 
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8 0
3 years ago
A(n) _____ reaction is a reaction in which an acid and a base react in an aqueous solution to produce a salt and water.
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3 years ago
1.00g of a metallic element reacts completely with 300cm3 of oxygen at 298K and 1 atm pressure to form an oxide which contains O
elena55 [62]

Answer:

The metal is most likely calcium which has a molar mass of 40.078 g

<em>Note: The question is incomplete. The complete question is given below:</em>

1.00g of a metallic element reacts completely with 300cm3 of oxygen at 298K and 1 atm pressure to form an oxide which contains O2– ions. The volume of one mole of gas at this temperature and pressure is 24.0dm3 .

What could be the identity of the metal?

<em>A calcium B magnesium C potassium D sodium</em>

Explanation:

Number of moles of the oxygen gas reacted is first determined:

Volume of oxygen gas = 300 cm³ = 0.30 dm³

1 mole of a gas occupies 24.0 dm³ at this temperature and pressure

Number of moles of oxygen gas that will occupy 0.30 dm³ = 0.3/24 = 0.125 moles

Let M be represent the metallic element. The equation of the reaction will be:

2M + O₂ ----> 2MO

From the equation of reaction;

2 moles of the metal reacts with 1 mole of oxygen gas

2 * 0.125 moles of the metal will react with 300 cm³ of oxygen  = 0.025 moles

Since the mass of the metal that reacted with oxygen is 1.0 g, therefore, 1.0 g of the metal = 0.025 moles

mass of 1 mole of the metal = 1 /0.025 = 40.0 g

Therefore, the metal is most likely calcium which has a molar mass of 40.078 g

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