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3 years ago

POSSIBLE POINTS: 1

Chemistry

1 answer:

olga_2 [115]3 years ago

5 0

Answer:

CLEANER

Explanation:

Independent variable is the variable in an experiment that is changed or manipulated by the experimenter in order to bring about a measurable response.

In this question, Marie notices that the current cleaner she is using on her shower is not cutting through the hard water build-up that has accumulated. She decides to purchase 3 other cleaners to see if one of them will do a better job of cutting through the stains. The CLEANERS being changed in this experiment is the INDEPENDENT VARIABLE.

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How many moles of carbon are in the sample?

jeka94

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3 years ago

What is the protons and where are they are located and their charge?

Ira Lisetskai [31]

Answer:

positively charged

they are located in an atom in the nucleus

Explanation:

plato was right

8 0

2 years ago

Read 2 more answers

Predict the ground-state electron configuration of the following ions. Write the answer in abbreviated form beginning with noble

Tanzania [10]

Answer: The ground-state electronic configuration of

1) $Ru^{2+}=[Kr]4d^6$

2) $W^{3+]=4f^{14}5d^3$

Explanation: The electronic configuration of elements is defined as the distribution of electrons around the nucleus of that element. It depends on the atomic number of the element.

Atomic number of the element = Number of electrons.

For Ru-element

Atomic number = 44

Number of electrons = 44

Electronic configuration of Ru-element = $[Kr]4d^75s^1$

To form $Ru^{2+}$ , 2 electrons are released from the neutral Ru-element.

So, the electronic configuration of $Ru^{2+}=[Kr]4d^6$

For W-element

Atomic number = 74

Number of electrons = 74

Electronic configuration of W-element = $[Xe]4f^{14}5d^46s^2$

To form $W^{3+}$ , 3 electrons are released from the neutral W-element.

So, the electronic configuration of $W^{3+}=[Xe]4f^{14}5d^3$

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4 years ago

Read 2 more answers

When nitrogen gas (N2) reacts with hydrogen gas(H) ammonia gas (NH3) is formed. How many grams of hydrogen gas are required to r

kupik [55]

Mass of Hydrogen gas required to react : 0.936 g

<h3>Further explanation</h3>

Reaction on Nitrogen gas and Hydrogen gas to produce Ammonia gas

N₂ (g) + 3 H₂ (g) ⇒ 2 NH₃ (g)

Conditions at T 0 ° C and P 1 atm are stated by STP (Standard Temperature and Pressure). At STP, Vm is 22.4 liters / mol

so mol Nitrogen for 3.5 L at STP :

$\tt mol=\dfrac{3.5~L}{22.4~L}=0.156$

From the equation, mol ratio of N₂ : H₂ = 1 : 3, so mol H₂ :

$\tt \dfrac{3}{1}\times 0.156=0.468$

then mass of Hydrogen(MW= 2 g/mol) :

$\tt mass=mol\times MW\\\\mass=0.468\times 2\\\\mass=0.936~g$

7 0

3 years ago

Hydrogen gas is produced when zinc reacts with hydrochloric acid. If the actual yield of this reaction is 85%?

Leokris [45]

Reaction equation:
Zn + 2HCl → ZnCl₂ + H₂

One mole of gas occupies 22.4 L at STP
Moles of H₂ = 112/22.4
= 5 moles

The theoretical amount of Zn needed is 5 mol
The actual amount = 5/0.85
= 5.88 moles

mass = moles x Mr
mass = 5.88 x 65
mass = 382.2 g

The answer is D.

7 0

3 years ago