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2 years ago

What dose the T-cell attack

Chemistry

1 answer:

MAXImum [283]2 years ago

5 0

Answer:

killer T-cell find and destroy infected cells that have been turned into virus-making factories

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The unbalanced equation for the reduction of copper(I) sulfide with oxygen is given below. What mass of copper is produced from

uranmaximum [27]

Answer: The mass of copper produced is 7.12 grams

Explanation:

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)

Given mass of copper (I) sulfide = 8.80 g

Molar mass of copper (I) sulfide = 156.2 g/mol

Putting values in equation 1, we get:

$\text{Moles of copper (I) sulfide}=\frac{8.80g}{156.2g/mol}=0.056mol$

The chemical equation for the reaction of copper (I) sulfide and oxygen gas follows:

$Cu_2S+O_2\rightarrow 2Cu+SO_2$

By Stoichiometry of the reaction:

1 mole of copper (I) sulfide produces 2 moles of copper

So, 0.056 moles of copper (I) sulfide will produce = $\frac{2}{1}\times 0.056=0.112mol$ of copper

Now, calculating the mass of copper from equation 1, we get:

Molar mass of copper = 63.55 g/mol

Moles of copper = 0.112 moles

Putting values in equation 1, we get:

$0.112mol=\frac{\text{Mass of copper}{63.55g/mol}\\\\\text{Mass of copper}=(0.112mol\times 63.55g/mol)=7.12g$

Hence, the mass of copper produced is 7.12 grams

6 0

2 years ago

Elements in a group have the same number of valence electrons and the same ____

frozen [14]

The elements in each group have the same number of electrons in the outer orbital. Those outer electrons are also called valence electrons. They are the electrons involved in chemical bonds with other elements. Every element in the first column (group one) has one electron in its outer shell.

5 0

2 years ago

Which of the following describes scientists?

jasenka [17]

Answer:C.people with perfect understanding of science.

3 0

2 years ago

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If a mixture looks smooth and the same throughout it is probably what

gulaghasi [49]

Answer:
If a mixture looks smooth and the same throughout it is probably Homogeneous.

Explanation:
Mixture is the combination of different compounds which are unreactive to each other.

Mixture are classified as ...

Solutions; in which the mixed compounds are thoroughly mixed and cannot be distinguished from each other and are said to be homogeneous. In solutions the size of solute is very small (i.e. Less than 1 nm).

Colloids; in which the solute is homogeneous visually but heterogeneous microscopically. The size of particles in this case is between 1 nm to 1 μm.

Suspensions; in which the mixture is heterogeneous, the particle size is greater than 1 μm and settles down (precipitation) under the influence of gravity.

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3 years ago

The planets which lie beyond the asteroids are called the _____ planets.

scoray [572]

It is different everywhere you look but it's mainly asteroid belt

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2 years ago

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