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# Questions posted in Chemistry

### Explain the difference between mass and weight and how are they measured

Mass is the actual amount of material contained in a body and is measured in kg, gm, etc. Whereas weight is the force exerted by the gravity on that object mg. Note that mass is independent of everything.

ANSWERED AT 01/06/2020 - 04:33 PM

QUESTION POSTED AT 01/06/2020 - 04:33 PM

### Matter is made up of small particles called

I think the answer is atoms

ANSWERED AT 01/06/2020 - 04:32 PM

QUESTION POSTED AT 01/06/2020 - 04:32 PM

### Assuming all volume measurements are made at the same temperature and pressure, how many liters of oxygen gas would it take to react completely with 7.25 liters of hydrogen gas? Show all of the steps taken to solve this problem. (4 points) Balanced equation: 2H2 (g) + O2 (g) yields 2H2 O(g)

2H2 (g) + O2 (g) -->2H2 O(g)
mole ratio of H2:O2=2:1
7.25/2=3.625

ANSWERED AT 01/06/2020 - 04:31 PM

QUESTION POSTED AT 01/06/2020 - 04:31 PM

### According to Coulomb’s law, which ionic compound A–D has the smallest electrostatic potential energy (i.e., closest to zero)? The size of the anion increases in the order F < Cl < Br < I.

According to Coulomb’s law, the ionic compound A–D has the smallest electrostatic potential energy is NaI.

because electrostatic potential depends on the charge whether it is positive or negative. since here, all of them F, Cl, Br and I have a negative charge. And the sizes of
F < Cl < Br < I are in this order.

ANSWERED AT 01/06/2020 - 04:24 PM

QUESTION POSTED AT 01/06/2020 - 04:24 PM

### What are some reasons why the research should be put through a peer-review process?

So they can tell if the researcher was lying/making up data.  Or to give constructive critisicm on how the test could be improved

ANSWERED AT 01/06/2020 - 04:21 PM

QUESTION POSTED AT 01/06/2020 - 04:21 PM

### Which subatomic particle has negligible mass and travels around outside the nucleus? proton neutron electron orbital

The subatomic particles you describe are Electrons.

ANSWERED AT 01/06/2020 - 04:20 PM

QUESTION POSTED AT 01/06/2020 - 04:20 PM

### What is the units of k in the following expression: rate = k[A][B]? A) s^-1 B)M^-1 s^-1 C)M^-2 s^-1 D)M

What is the units of k in the following expression: rate = k[A][B]?

A) s^-1
B)M^-1 s^-1
C)M^-2 s^-1
D)M

ans: B

ANSWERED AT 01/06/2020 - 04:19 PM

QUESTION POSTED AT 01/06/2020 - 04:19 PM

### What would be the best technique to separate an insoluble solid from an liquid, like sand from water

Sand can be separated from a mixture of sand and water using filtration. That's because sand does not dissolve in water.

ANSWERED AT 01/06/2020 - 04:18 PM

QUESTION POSTED AT 01/06/2020 - 04:18 PM

### Which of the following suggests that a physical change has taken place in an ice cube

The melting of the ice cube indicates physical change has taken place

ANSWERED AT 01/06/2020 - 04:18 PM

QUESTION POSTED AT 01/06/2020 - 04:18 PM

### A scientist takes a small, partially inflated balloon out of liquid nitrogen (at a very low temperature). As the balloon rests on the table, it begins to grow in size. Which statement(s) best explains why the balloon grows?

At first, the temperature of liquid nitrogen ensures that the air in the balloon doesn't take much volume. The temperature being optimal for liquid nitrogen makes sure that the nitrogen stays liquid, however, as the temperature increase and the balloon begins to heat up the nitrogen in the balloon begins to boil due to its boiling point being very low and the volume beings to increase. This causes the balloon to grow in size. Using Charle's law it can be determined that the volume of a gas in any space is proportional to the absolute temperature of such gas.

ANSWERED AT 01/06/2020 - 04:17 PM

QUESTION POSTED AT 01/06/2020 - 04:17 PM

### Which mathematical relationship should you use to convert moles of a substance into grams? mass in grams = number of moles · molar mass in g/mol mass in grams=number of molesmolar mass in g/mol mass in grams=molar mass in g/molnumber of moles mass in grams = molecular weight · molar mass in g/mol

The molecular weight (g/mole) grams =moles * g/mole

ANSWERED AT 01/06/2020 - 04:16 PM

QUESTION POSTED AT 01/06/2020 - 04:16 PM

### What is the net ionic equation for the following reaction? H2CrO4 + Ba(OH)2

The answer would be H++OH- -> H20 (Third option on the edgenuity assignment)

ANSWERED AT 01/06/2020 - 04:16 PM

QUESTION POSTED AT 01/06/2020 - 04:16 PM

### For an exothermic reaction, what effect will increasing the temperature have on equilibrium?

The system will then shift to the left, making more reactants.

ANSWERED AT 01/06/2020 - 04:14 PM

QUESTION POSTED AT 01/06/2020 - 04:14 PM

### Gas molecules colliding with the walls of a container exert a force called ___

I believe this force would be called pressure!

ANSWERED AT 01/06/2020 - 04:14 PM

QUESTION POSTED AT 01/06/2020 - 04:14 PM

### How many atoms are shared by a triple bond? 2 4 6 8

I believe from what I have read is there either one or five! I'm not too sure but I think that's correct!

ANSWERED AT 01/06/2020 - 04:13 PM

QUESTION POSTED AT 01/06/2020 - 04:13 PM

### What percentage of children who are raised in abusive households grow up to be abusive parents themselves?

33%, according to Quizlet

ANSWERED AT 01/06/2020 - 04:13 PM

QUESTION POSTED AT 01/06/2020 - 04:13 PM

### Why do electrons enter the 4s orbital before entering the 3d orbital? because the 3d orbital is at a lower energy level because both the 4s and 3d orbitals are at the same energy level because the 4s orbital is at a lower energy level because the 4s orbital is at a higher energy level

So, a basic principle of the Universe is that particles WILL ALWAYS ENTER THE STATE OF LOWEST ENERGY. Because there are already so many electrons in the 3rd energy level, it jumps to the 4s level because there is less energy in the 4s level (because even though it's further out, there aren't that many electrons repelling it) — so it jumps to the place with lowest energy.

ANSWERED AT 01/06/2020 - 04:13 PM

QUESTION POSTED AT 01/06/2020 - 04:13 PM

### My chemistry teacher wants us to make a poster with chemistry as an acronym. Any ideas?

C-Chlorine
H-Hydrogen
E-Einsteinium
M-Magnesium
I-Iodine
S-Sulfur
T-Tantalum
Y-Yttrium

ANSWERED AT 01/06/2020 - 04:12 PM

QUESTION POSTED AT 01/06/2020 - 04:12 PM

### The most common source of copper (Cu) is the mineral chalcopyrite (CuFeS2). How many kilograms of chalcopyrite must be mined to obtain 210. g of pure Cu?

To find out the answer, we must know the mass percentage of Cu in the mineral chalcopyrite.

Mass percentage of Cu = molar mass of Cu/molar mass of chalcopyrite = 64/(64+56+32*2) = 34.8%.

So to obtain 210 g pure Cu, the amount of mineral need = mass of Cu/mass percentage of Cu = 210 g/34.8% = 603 g = 0.603 kg.

ANSWERED AT 01/06/2020 - 04:12 PM

QUESTION POSTED AT 01/06/2020 - 04:12 PM

### Checking the dining areas of an eating establishment for evidence of flaking paint broken lightbulbs and wood damage will reduce the chances of

Checking the dining area of an eating establishment for evidence of flaking paint, broken light bulbs and wood damage will reduce the chances of PHYSICAL CONTAMINATION OF FOOD. Many food safety guidelines had been produced by the Food and Drug Administration to ensure public food safety in restaurants and other public eateries.

ANSWERED AT 01/06/2020 - 04:08 PM

QUESTION POSTED AT 01/06/2020 - 04:08 PM

### Which of the following are potential benefits of wind turbines? (may be more than one answer) A. viable source of power B. creates less pollution C. is expensive to set up D. is a renewable energy source

All except for C. And it's good for the environment.

ANSWERED AT 01/06/2020 - 04:07 PM

QUESTION POSTED AT 01/06/2020 - 04:07 PM

### What kind of geometry does the following molecule have? CF4

What kind of geometry does the following molecule have? CF4 - Tetrahedral

ANSWERED AT 01/06/2020 - 04:07 PM

QUESTION POSTED AT 01/06/2020 - 04:07 PM

### What causes water molecules to have the shape they have, according to VSEPR theory? A. ionic attraction and repulsion B. the unusual location of the free electrons C. repulsive forces between specific electrons D. interaction between the fixed orbitals of the unshared pairs of oxygen

What causes water molecules to have the shape they have, according to VSEPR theory? C. repulsive forces between specific electrons

ANSWERED AT 01/06/2020 - 04:07 PM

QUESTION POSTED AT 01/06/2020 - 04:07 PM

### The molar masses of three gases, A, B, and C, are 4 grams, 16 grams, and 32 grams respectively. Which sentence represents the effusion rates of these gases? A). A < B < C B). C < B < A C). B < C < A D). B < A < C

ANSWERED AT 01/06/2020 - 04:05 PM

QUESTION POSTED AT 01/06/2020 - 04:05 PM

### Which arrows represents the phase transitions in which he's energy is gained

The correct answer would be the first option. The arrows 1, 2 and 3 represent the phase transitions where heat energy is gained. As heat energy is gained the kinetic energy of the molecules in a substance is increased which would cause them to change phases from solid to liquid and to gas.

ANSWERED AT 01/06/2020 - 04:03 PM

QUESTION POSTED AT 01/06/2020 - 04:03 PM

### At what temperature is the boiling point of this substance

That would be 100 degrees C or 212 F

ANSWERED AT 01/06/2020 - 04:02 PM

QUESTION POSTED AT 01/06/2020 - 04:02 PM

### Whats the darn answer you nimbisol

The darn answer u nimbisol is the opposite

ANSWERED AT 01/06/2020 - 04:02 PM

QUESTION POSTED AT 01/06/2020 - 04:02 PM

### What is the density of an 8.0 g and a volume of 25 cm3

Density equals mass over volume. Density = 8.0 divided by 25
hope i helped(:

ANSWERED AT 01/06/2020 - 04:02 PM

QUESTION POSTED AT 01/06/2020 - 04:02 PM

### In which region is the substance in both the solid phase and the liquid phase ?

In which region is the substance in both the solid phase and the liquid phase ?
2

ANSWERED AT 01/06/2020 - 04:01 PM

QUESTION POSTED AT 01/06/2020 - 04:01 PM