Explain the difference between mass and weight and how are they measured
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
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)
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.
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?
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
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
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
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
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?
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
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
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?
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 ___
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
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?
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
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?
H-Hydrogen
E-Einsteinium
M-Magnesium
I-Iodine
S-Sulfur
T-Tantalum
R-Radon
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?
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
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
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
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
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
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
ANSWERED AT 01/06/2020 - 04:02 PM
QUESTION POSTED AT 01/06/2020 - 04:02 PM
Whats the darn answer you nimbisol
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
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 ?
2
ANSWERED AT 01/06/2020 - 04:01 PM
QUESTION POSTED AT 01/06/2020 - 04:01 PM
In which region is the substance in both the solid phase and the liquid phase ?
Answer: Region 3
Explanation: The temperature and time graph suggests that region 3 is the region in which the substance can co exist in both the phases that is solid phase and liquid phase.
Region 1 explains that the the solid has just started melting and there occurs a break point and then region 2 again explains that the solid is taking more time with temperature to get converted into the liquid and thus region 3 explains the equilibrium between the two phases.
ANSWERED AT 01/06/2020 - 04:01 PM
QUESTION POSTED AT 01/06/2020 - 04:01 PM