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3 years ago

A student came late to class and started her notes midway through the lecture. These are the notes she copied:

2 answers:

6 0

Asteroids  This is a matter of knowing the definitions. Although the biggest hint is "Make up a belt between Mars and Jupiter" which should cause you to immediately think "Asteroid Belt". But let's look at the options and see what fits.
Comets - Mostly comprised of ice and dust. They're not "rocky", so this isn't a good choice.
Asteroids - Nothing the lecture describes conflicts with what an asteroid is, so this is the correct choice.
Meteor - Key thing here is a meteor is that a meteor is a small body that's burning up in the Earth's atmosphere, causing a streak of light. And that's not what the lecture is describing, so this is a bad choice.
Meteoroids - This is a body orbiting the sun, that will in the future become a meteor. And that's not something in a stable orbit between Mars and Jupiter. So this is also a bad choice.

stich3 [128]3 years ago

6 0

The answer would be B)Asteroids

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If you have 5.00 x 10^24 molecules of water how many moles of water would you<br> have?

shepuryov [24]

Answer:

8.31moles of H2O

Explanation:

Avogadro's hypothesis gives us an excellent understanding that 1mole of any substance contains 6.02x10^23 molecules. This means that 1mole H2O also contains 6.02x10^23 molecules.

Now, if 1 mole of H2O contains 6.02x10^23 molecules

Therefore, Xmol of H2O will contain 5.00x10^24 molecules i.e

Xmol of H2O = (5.00x10^24)/6.02x10^23 = 8.31moles of H2O

3 0

3 years ago

PLEASE HELP ME!!!! WILL GIVE BRAINLIEST!!!!

vitfil [10]

Answer: 1. 3.23 m

2. 32.4

3. B adding solvent and C removing solute

Explanation:

1. Molality of a solution is defined as the number of moles of solute dissolved per kg of the solvent

$Molality=\frac{n}{W_s}$

where,

n = moles of solute

$W_s$ = weight of solvent

Now put all the given values in the formula of molality, we get

$Molality=\frac{43.6mol}{13.5kg}=3.23mol/kg$

2. Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

$Molarity=\frac{n}{V_s}$

where,

n = moles of solute

$V_s$ = volume of solution in L

$3.4=\frac{n}{9.54}$

$n=32.4$

Therefore, the moles of $Na_2CO_3$ is 32.4

3. Molarity can be decreased by decreasing the moles of solute and by increasing the volume of solution.

Thus adding solvent and removing solute will decrease the molarity.

4 0

3 years ago

Look at the image shown.

Marina86 [1]

Linear molecule with two domains

Explanation:

The describe geometry of the substance fits that of a linear molecule with two domains.

This description is based on the VSEPR i.e Valence Shell Electron Pair repulsion(VSEPR) model. It states that if an atom is bonded by two or more kinds of atoms the shape is determined by the geometry of the bonds around the central atom.

The electron domain is the number of lone pairs of electron around an atom.

Here in CO₂:

there are two lone pairs and the oxygen atoms are in a 180° linear shape around the central carbon atom. The bond is made up of two O⇔C structure.

Learn more:

Valence shell brainly.com/question/10901976

#learnwithBrainly

8 0

4 years ago

Read 2 more answers

What is the density of the marble when the mass = 10g

Marysya12 [62]

The density of marble is between 2.6 and 2.8 grams per cm³ .

Density doesn't depend on how much mass or volume of it you have.
The density of a chip of it is the same as the density of a truckload of it.

3 0

4 years ago

How many moles of oxygen (O2) are present in 33. 6 L of the gas at 1 atm and 0°C? 1. 5 2 22. 4 32.

oee [108]

The number of moles of oxygen in the gas is 1.5 L.

The correct option is (A).

<h3>What are moles? </h3>

The mole is the International System of Units' foundation unit of material quantity.

Given,

The volume of gas is 33.6 L

Pressure is 1 atm.

Temperature is 0°C

Molar gas volume is 22.4 L

There is no temperature and pressure is 1 atm.

By formula of moles, volume is divided by molar mass

$\bold{\dfrac{33.6}{22.4 } =1.5\; mole}$

Thus, option A is correct. 1.5 L.

Learn more about gas, here:

brainly.com/question/13123721

3 0

2 years ago