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3 years ago

A 1.0-gram sample of which element will uniformly fill a closed 2.0-liter container at STP?

Chemistry

2 answers:

Paladinen [302]3 years ago

8 0

Answer:

Carbon

Explanation:

To know this, let's write the ideal gas expression:

PV = nRT

As we are in STP, means that we have a pressure of 1 atm and 0 °C or 273.15 K. So, we have the volume which is 2 L, all we have to do is to calculate the moles of the substance, and then, the molecular weight with the given mass. The molecular weight that matches any of the option, would be the elemento that fullfill these conditions:

the moles (n):

n = PV/RT

n = 1 * 2 / (0.08206*273.15)

n = 0.089 moles

Now that we have the moles, let's calculate the molecular weight.

MM = m/n

MM = 1 / 0.089

MM = 11.24 g/mol

This molecular weight is very close to the molecular mass of the carbon (12 g/mol) . So the correct option is b, carbon.

Nesterboy [21]3 years ago

5 0

The answer will be C. Xenon

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Carlos is looking at a picture of a convergent boundary on which a volcanic arc and a trench are identified. Which type of conve

Elan Coil [88]

The answer would be:

Oceanic-Oceanic Convergent Plate

This is why:

When two oceanic plates collide, the heavier of the two would subduct or in other words, go under the other plate. When this happens, ocean trenches and volcanic arcs form. The trench forms at the point oceanic plate goes under the other plate. And above the other plate that goes over create volcanic arcs.

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3 years ago

A student carries out this chemical reaction in a beaker:

nydimaria [60]

Answer:The correct answer is option (C).

Explanation:

$Zn+CuCl_2\rightarrow Cu+ZnCl_2$

After the reaction between Zinc and copper(II) chloride, Zinc chloride and copper will be obtained as a product. This reaction occurs because zinc is more reactive than copper which displaces the copper from its aqueous solution.

The student will expect to find copper metal at bottom of the beaker with aqueous solution of zinc chloride.

Hence the correct answer is option (C).

7 0

3 years ago

Which kind of matter can be homogenous or heterogenous ?

Eduardwww [97]

A homogeneous mixture has the same uniform appearance and composition throughout. Many homogeneous mixtures are commonly referred to as solutions. A heterogeneous mixture consists of visibly different substances or phases. The three phases or states of matter are gas, liquid, and solid.
Hope this helps you!

5 0

4 years ago

Physical science!!! please help

IgorLugansk [536]

Answer:

The correct answer is : No, because there are 4 hydrogen atoms on the reactants side and 2 on the products side.

Explanation:

$NH_4NO_3\rightarrow N_2O+H_2O$

The given reaction equation is not balanced because:

Number of hydrogen atoms on both sides are not equal that is 4 on reactants side and 2 on products side.
Number of oxygen atoms on both sides are not equal that is 3 on reactants side and 2 on products side.

In a balanced chemical equation number of atoms of each elements are equal on both sides.

So, the balanced chemical equation will be:

$NH_4NO_3\rightarrow N_2O+2H_2O$

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4 years ago

Which product forms from the synthesis reaction between lithium (Li) and oxygen (O)?

Advocard [28]

Answer:

A Li2O

Explanation:

Li has a 1+ charge and O has a 2- charge so to balance the charges there needs to be 2 Li for every 1 O

5 0

3 years ago