CHEMISTRY HIGH SCHOOL

Which of the following events on the sun affects the Earth in either a direct or indirect way?A. Corona mass ejection or CMEs only
B. Solar flares only
C. Solar systems only
D. All of the above

Answers

Answer 1
Answer:

Answer:

Explanation:

D

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If a straight-chain hydrocarbon is a gas at room temperature, how many carbon atoms will it have?A. 6 carbon atomsB. 12 carbon atomsC. 24 carbon atomsD. 3 carbon atoms
Which of the following is not a type of adaptation? A. Functional B. Mechanical C. Behavioral D. Structural
Properties that make titanium useful for tennis rackets and wheelchairs
Can someone pls help me I appreciate it
The reaction of p-aminophenol with one mole of actyl chloride in presence of pyridine gives:

How do you determine formula units in a unit cell?

Answers

In order to determine the number of formula units of a substance in a cell, you need to know the density of the substance and the edge length of the unit cell. Suppose that you are given the following problem:The density of TlCl(s) is 7.00 g/cm³, and the length of an edge of a unit cell is 385 pm. How many formula units of TlCl are in a unit cell?
Here’s how you solve the problem.Calculate the volume of the unit cell.
If the length of an edge of the cell is a, then V = a³.
V = (385 × 10⁻¹² m)³ = 5.71 × 10⁻²⁹ m³Use the density to calculate the mass of the unit cell (The density of TlCl is the same, no matter what volume of TlCl we have).
Mass = 5.71 × 10⁻²⁹ m³ × (7.00 g/1 cm³) × (100 cm/1 m)³ = 3.99 × 10⁻²² gUse the molar mass to convert grams to moles.
3.99 × 10⁻²² g × (1 mol/239.8 g) = 1.67 × 10 ⁻²⁴ molUse Avogadro’s number to calculate the number of formula units.
1.67 × 10 ⁻²⁴ mol × (6.022 × 10²³ formula units/1 mol) = 1.00 formula units
Therefore, 1 unit cell of TlCl contains 1 formula unit.

Final answer:

To determine the formula units in a unit cell, understand the type of the unit cell structure (simple cubic, body-centred cubic, or face-centred cubic) and apply the appropriate calculation for that type.

Explanation:

To determine the number of formula units in a unit cell, one must first understand what these terms mean. A unit cell is the smallest repeating unit of a crystal lattice. There exist several different types that affect formula unit arrangement and quantity, including simple cubic, body-centred cubic, and face-centred cubic.

A crystal lattice is a three-dimensional framework of atoms, ions, or molecules arranged in a repeating pattern. The formula unit is the lowest whole-number ratio of ions represented in an ionic compound. In a simple cubic unit cell, there's one formula unit, in a body-centred cubic cell, there are two, and in a face-centred cubic cell, there are four.

For instance, if you are dealing with a simple cubic arrangement the unit cell is composed of 8 atoms forming the vertices and each one is shared amongst 8 neighbouring cells, you have (8 x 1/8 = 1) formula unit per cell. Similarly, in a body-centred cubic, there is 1 atom in the centre fully inside, and 8 on the corners shared with neighbouring cells, hence (1 + 8 x 1/8 = 2) formula units per unit cell.

Learn more about Unit Cells and Formula Units here:

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All organic molecules have what element in common

Answers

Every organic molecules/compound contains carbon (c).

Some other very abundant are hydrogen, nitrogen, oxygen, phosphorus, and sulfur.

I learned this with the acronym CHNOPS.

C - Carbon

H - Hydrogen

N - Nitrogen

O - Oxygen

P - Phosphorus

S - Sulfur

Hope this helps!

Answer: The elements which are common for all organic molecules is hydrogen and carbon.

Explanation:

Another name for organic molecules are hydrocarbons. This means that the molecules which consist of hydrogen and carbon atoms is an organic compound.

For Example:

H_2O\text{ and }CO_2 are not organic compounds, because in water, carbon is not there and in carbon dioxide, hydrogen is not there. But, CH_4 is an organic compound because hydrogen and carbon both are present.

Hence, hydrogen and carbon elements are common to all organic molecules.

The density of lead is 11.4 g/cm3 at 20°C. A chemist has a metallic sample that is either pure lead or mostly lead. If the density of the sample is 11.0 g/cm3 at 20°C, then the sample most likely is _____.  A. pure lead 
b. lead mixed with heavier substances 
c. lead mixed with lighter substances

Answers

Answer:

The correct answer is option c.

Explanation:

Density is defined as mass present in unit volume of the substance.

Density=(Mass)/(Volume)

Given that density of pure lead is more than that of the sample.

Density of lead = 11.4 g/cm^3

Density of sample = 11.0 g/cm^3

Since, we know that density is directly linked to mass of the substance. So with decrease in density of substance indicates that mass present in unit volume of the substance has also decreased.

The reason behind the less density of sample from lead was that, that it was made up lead and other light substance.
The sample is most likely lead with lighter substances in it. Pure lead would be closer to the pure lead density, and heavier substances would make the density more, not less.

How many atoms are in 0.05 moles of xenon gas at STP?2.2 x 10^23

3.0 x 10^22

6.0 x 10^23

3.0 x 10^24

Answers

Answer: Option (b) is the correct answer.

Explanation:

According to the mole concept there are 6.022 * 10^(23) atoms present in 1 mole of a substance.

Mathematically,    1 mole = 6.022 * 10^(23) atoms or molecules

Therefore, number of atoms present in 0.05 moles of xenon are as follows.

                 0.05 * 6.022 * 10^(23)

                   = 0.3011 * 10^(23) atoms

or,                = 3.0 * 10^(22) atoms

Thus, we can conclude that there are 3.0 * 10^(22) atoms present in 0.05 moles of xenon gas at STP.
To convert moles to atoms, multiply moles by Avogadro's number:
(0.05mol Xe)(6.02x10^23 atoms) = 3.0x10^22 atoms Xe

1. The speed limit on most city streets is (25 miles). How many meters per minutehour
is this?
This is a conversion.

Answers

Answer:

Speed = 670.56 (m)/(min)

Explanation:

Given

Speed = (25 mi)/(hr)

Required

Convert to meters per minutes

Speed = (25 mi)/(hr)

Start by converting the speed from miles to meters

1\ mile = 1609.34\ meters.

So, we have:

Speed = (25 * 1609.34\ m)/(hr)

Speed = (40233.5\ m)/(hr)

Next, we convert time from hours to minutes

1\ hour = 60\ minutes

So, we have:

Speed = (40233.5\ m)/(60\ min)

Speed = 670.56 (m)/(min)

Hence, the equivalent of 25 miles per hour is 670.56 meters per minutes

The usual units of density are :
cm3/ g
cm2/g
g/cm
Nm

Answers

The usual units of density are g/cm.

You may have also seen g/mL used for density. Keep in mind that 1 cm = 1 mL.

g/cm^3

To answer directly its g/cm with the little three on top.

:)
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