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3 years ago

What is crystal lattice?

Chemistry

1 answer:

nata0808 [166]3 years ago

6 0

Answer:

the symmetrical three-dimensional arrangement of atoms inside a crystal.

Explanation:

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A sample of gold has a mass of 645.0 lb and a volume of 0.5348 ft. What is its specific gravity? Number SG= What are the units o

LekaFEV [45]

Explanation:

The given data is as follows.

Mass of gold = 645 lb, Volume = 0.5348 ft3

Density of water = 62.4 lbs/ft3

It is known that specific gravity is defined as density of substance divided by the density of standard fluid.

Mathematically, Specific gravity = $\frac{\text{density of gold}}{\text{density of water}}$

Specific gravity = $\frac{\text{density of gold}}{62.4 (lbs.ft^{-3})}$

Now, calculate the density of gold then from density we will calculate specific gravity as follows

Since, Density = $\frac{mass}{volume}$

Density = $\frac{645 lbs}{0.5348 ft^{3}}$

= 1206.06 $lbs/ft^{3}$

As, Specific gravity = $\frac{\text{density of gold}}{\text{density of water (standard fluid)}}$

= $\frac{1206.06 (lbs/ft^{3})}{62.4 (lbs/ft^{3})}$

= 19.32

Therefore, the value of specific gravity is 19.32.

Specific gravity has no units as it is density divided by density. Hence, all the units get canceled out.

7 0

3 years ago

Aspirin is one of the Aesthetic Values of biodiversity<br><br> true<br> false

Trava [24]

Answer:

true

Explanation:

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2 years ago

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2 Mg(s) + O2(g) → 2 MgO(s) How many moles of O2 ar

TEA [102]

Answer:

1.05 mols of O2 gas

Explanation:

For this type of problem, it's important to understand what the balanced Chemical equation tells us:

<h3><u>Balanced Chemical equations</u></h3>

Let's look at the balanced chemical equation:

$2Mg(s)+O_2(g)-- > 2MgO(s)$

This equation two sides of the reaction arrow. On the left are the reactants (things you start with, and that react during the chemical reaction), and on the right side are products (things that are produced during the chemical reaction that you end with).

The numbers in front of each compound tell how many of molecules are involved for a full reaction without anything left over. A "mol" is a large quantity ( $6.022*10^{23}$ ), in this case, of molecules , since it's unlikely you're only taking a single molecule of each substance (it would be so tiny, you wouldn't even know you were doing the reaction).

So,for every 2 moles of Magnesium used, we'll also need 1 mole of Oxygen, and it will produce 2 moles of Magnesium Oxide.

In a way, during the reaction it's almost like 2 moles of Magnesium is equal to 1 mole of Oxygen and is equal to 2 moles of Magnesium Oxide:

$2 mol Mg(s)=1mol O_2(g)=2molMgO(s)$

From here, we can build some unit ratios, to convert between the known quantity of moles we have, and find the unknown quantity of moles that are requested.

<h3><u>Finding the right unit ratio</u></h3>

We know that we are looking at 2.10 mol of Magnesium, so we want a unit ratio with moles of Mg on the bottom. <u>We want to find moles of O2</u>, <u>so we want a unit ratio of moles of O2 on top</u>.

The unit ratio we want is the middle part of the equation, divided by the left part of the equation.

$2 mol Mg(s)=1mol O_2(g)\\\frac{2 mol Mg(s)}{2 mol Mg(s)}=\frac{1mol O_2(g)}{2 mol Mg(s)}\\1=\frac{1mol O_2(g)}{2 mol Mg(s)}$

Since this quantity is 1, it is a unit ratio and can be multiplied to other things to change their units (for this problem).

<h3><u>Finding the answer</u></h3>

Starting with what we know, and multiplying by our unit ratio:

$2.10 mol Mg(s)*\frac{1mol O_2(g)}{2 mol Mg(s)}=1.05mol O_2(g)$

Notice that the units from the first quantity cancel with the units on the bottom of the fraction, leaving only the unit on top of the fraction ... the exact units we wanted!

So, 1.05mols of O2 would be consumed during the reaction if exactly 2.10moles of Magnesium are burned.

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3 years ago

Which of the following is a true statement?(1 point)

kkurt [141]

Answer:

Explanation:

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3 years ago

Which element have many metals reacted with?

jekas [21]

answer:

magnesium and zinc

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3 years ago

Read 2 more answers

What is crystal lattice?​

What is crystal lattice?