Answers
Answer:
a
Explanation:
Related Questions
Please help I’ll even give you brainliet
What is the molecular formula for a compound that is 34.31% sodium, 17.93% carbon, 47.76% oxygen and has a molar mass of 134.00g?
Answers
Answer: Na2C2O4 probably sodium oxalate
Explanation: assume you have 100 g substance.
Mass of Na is m(Na) = 34.31 g, m(C) = 17.93 g and m(O) = 47.76 g.
Calculate moles n(Na) = 34.31 g/22.99 g/mol= 1.49 mol.
For C n(C) = 1.49 mol and n(O) = 2.985. You divide all by 1.49 you
Get n(Na) : n(C) : n(O) = 1:1:2 M(NaCO2) = 67 g/mol.
Divide 134:67 = 2. You get formula Na2C2O4
An experiment was conducted in order to determine the enthalpy change that occurs when 1.0 mole of ice at 0 degrees Celsius melts and becomes 1.0 mole of water at 0 degrees Celsius. The enthalpy change associated with this process is referred to as the heat of fusion of ice. In the experiment a 9.68g sample of ice at 0 degrees Celsius was added to the coffee cup calorimeter containing 278.25 mL of distilled water. The temperature of the water was 22.485 degrees Celsius before The ice was added. The lowest temperature that was recorded after the ice had melted was 19.050 degrees Celsius.
A) find the amount of heat lost or gained by the water in the calorimeter.
B) in this experiment the ice melted and then the temperature of the water produced by the ice increased from 0 degrees Celsius to 19.050 degrees Celsius. Calculate the amount of heat absorbed by the melted ice as it’s temperature increased from 0.000 degrees Celsius to 19.050 degrees Celsius
C) calculate the heat that was gained by the ice during melting process
D) calculate the heat of the fusion of ice
E) is the reaction endothermic or exothermic?
F) energy was transferred from one system to another during this experiment. Identify the two interacting systems and outline the direction of energy flow.
G) was energy conserved in the process? Justify your answer.
Answers
Answer: 1
Explanation:
Experiment on enthalpy change.
The enthalpy is a hydrodynamic system that is made to collect the internal energy. The product is of pressure and volume. The experiment was conducted to see the enthalpic change that occurred at a 1.0 mole of ice at 0 degrees.
The answer is 9.68 grams.
The enthalpy change linked with the process is called as a fusion of heat of the ice. The temperature of the water was 278.25 ml hat of distilled water and the calorimeter consisted of 278.35 ml of water.The enthalpy change linked with this process is referred to as the heated fusion of ice. In the experiment a 9.68g sample.Learn more about the experiment was conducted.
brainly.com/question/17376718.
i need help again guyss
Answers
does a single atom make a difference to the properties of matter?
Answers
Yes, all things are made of atoms, and all atoms are made of the same three basic particles - protons, neutrons, and electrons. But, all atoms are not the same. ... The difference in the number of protons and neutrons in atoms account for many of the different properties of elements.
Chemical _____
energy is the energy stored in the chemical
bonds.
Answers
Answer:
yeah
Explanation:
it is a form of stored energy that is released when needed by a conversion chemical energy therefore it is a form of potential energy
hope this helps
Calculate the specific heat of the substance if 373 J is required to raise the temperature of a 312 gram sample by 25°C?
Answers
Explanation:
Q = 373J
∆∅ = 25°C
m = 312g
c = x
Q = mc∆∅
373 = 312(x)(25)
373 = 7800x
x = 373/7800
x = 0.0478J/(g°C)
The specific heat of the substance if 373 J is required to raise teh temperature of a 312 gram sample by 25°C is 0.0478 J/g
What is specific heat?The amount of energy needed to raise the temperature of one gram of a substance by one degree Celsius.
By the formula of specific heat
Q = mc∆∅
Q = 373J
m = 312g
∆∅ = 25° C
Putting the values in the equation
[tex]373 = 312\times c \times (25)\\\\373 = 7800c\\c= \dfrac{373}{7800} = 0.0478J/(g \circ C)[/tex]
Thus, the specific heat of the substance if 373 J is required to raise teh temperature of a 312 gram sample by 25°C is 0.0478 J/g
Learn more about specific heat
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Choose the correct option
Answers
Answer:
C
Explanation:
Hope this helps.
And this one too please
Answers
Answer: Groups 15 and 16.
Explanation:
All other answer choices include metals, which form ionic bonds.
The two cells produced at the end of MITOSIS
are
Answers
Answer:
It produces two identical daughter cells
Explanation:
1 haploid splits into 2 genetically identical haploid cells which are called daughter cells
same thing with diploid cells
1.0 mole of KCl(aq) is added to which solution to produce a precipitate?
A)
Lit
B)
Ca2+
Agt
D)
Zn2+
Answers
Answer:
Ag+
Explanation:
If you imagine as if the problem were double replacement, you would pair the Cl with one of the following ions provided in the choices. As seen on Table F, Ag+ paired with Cl- produces an insoluble compound, hence the precipitate. All the other ions shown in the multiple choice section, when paired with Cl- will produce a soluble compound, as a result NOT a precipitate.
Calculate the number of atoms in 0.50 moles of Barium
Answers
.5 * 137.33 = 68.67
BaCl² produces barium gas plus chlorine gas when heated. what would be the combined mass of the barium and chlorine if 15 g of Barium chloride was heated
Answers
In order to form water, two hydrogen atoms and one oxygen atom must be
A. dissolved.
B. bonded.
C. divided.
D. mixed.
Answers
Answer:
B bonded
Explanation:
Two molecules of hydrogen gas (two hydrogens bonded together) are combined with one molecule of oxygen gas (two oxygen atoms bonded together) in order to form two molecules of water (two hydrogen atoms bonded to one oxygen atom). What are covalent bonds? Covalent bonds occur when two or more atoms share electrons.
In order to form water, two hydrogen atoms and one oxygen atom must be bonded. The correct option is B.
What are covalent bonds?Covalent bonds between two or more atoms occur when they share electrons. with each other.
Two molecules of hydrogen gas are combined with one molecule of oxygen gas which forms two molecules of water. Hydrogen take one electron and oxygen can donate two electrons. One oxygen shares two electron with two hydrogen with one electron gaining capacity.
Thus, in order to form water, two hydrogen atoms and one oxygen atom must be bonded. The correct option is B.
Learn more about covalent bond.
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Elements with a high ionization energy lose electrons easily (True or False).
Answers
Answer:
False
Explanation:
If 0.25 moles of KBr is dissolved in 0.5 liters of
heavy water which has a mass of 1,100 grams
per liter, what is the concentration?
Answer in units of m (molal).
Answers
Answer:
[KBr] = 454.5 m
Explanation:
m is a sort of concentration that indicates the moles of solute which are contianed in 1kg of solvent.
In this case, the moles of solute are 0.25 moles.
Let's determine the mass of solvent in kg.
Density of heavy water, solvent, is 1.1 g/L and our volume is 0.5L.
1.1 g = mass of solvent / 0.5L, according to density.
mass of solvent = 0.5L . 1.1g/L = 0.55 g
We convert the mass to kg → 0.55 g . 1kg /1000g = 5.5×10⁻⁴ kg
m = mol/kg → 0.25 mol /5.5×10⁻⁴ kg = 454.5 m
PLEASE HELP ME ASAP!!!!!!!!!!!!!!!!!!
Answers
In what type of reaction does one product break down to form 2 new products?
Answers
Answer:
decomposition reaction
20 points! Help please
Answers
Answer: 2N2O3 -> 2N2 + 3O2
Explanation:
Answer:
2 2 3
Explanation:
2N2O3=2N2+3O2.. ....
Compound A has 4 moles of hydrogen, 4 moles of oxygen, and
1 moles of silicon. The empirical formula of the compound is _____
Answers
Answer:
H₄SiO₄
Explanation:
From the question given above, the following data were obtained:
Hydrogen (H) = 4 moles
Oxygen (O) = 4 moles
Silicon (Si) = 1 mole
Empirical formula =?
Since the number of mole of each atom of the element present is known, the empirical formula of the compound can be written as follow:
H₄SiO₄
Need done fast please! 41 points
Heat energy provided during phase change is used to:
increase kinetic energy
break intermolecular bonds
break intramolecular bond
decrease kinetic energy
Answers
Answer:
I'm not exactly sure but I think it's the first one if I'm wrong tell me so I know and I don't know how I can get points back but if I can figure it out I will tell me if I'm wrong
I know this is personal but I need some advice, grab some popcorn this is going be a long story.
So I just barely went back to real school and these new people move into the house next to me so the daughter is my sisters friend, the other sister is my friend. So on the first day ( or second or third I don't know) My friend wa sitting by me on the bus then her brother ( a grade higher than mine ) sits by me and starts asking all these weird questions, then he askes a question I don't wanna answer then I say I can't tell him and he starts poking me ( yeah i'm serious ) then I went home and my sister started telling me that her friend ( the girl who just moved to my neighborhood) told her that one of her brothers like me. So I thought that kid on the bus ( her brother) likes me. But then today he kept on looking at me then he moved to the seat by my seat and he started showing me stuff on his phone ( I didn't even ask him to) like I was his best friend, then as I was getting off HE POKED ME AGAIN. So my question is does this guy like me ? ( p.s hes 2 years older than me) Please answer anyone I need help And i need lots of feedback. And hurry. I kinda ike him
Answers
Answer:
email me 4
Explanation:
2) Convert 6.11 g of sodium hydroxide, NaOH to moles.
Answers
Answer:
moles NaOH = = 0.1528 mole NaOH
Explanation:
To convert grams to moles => divide grams by formula weight
To convert moles to grams => multiply moles times formula weight
In short ...
grams => moles => grams/formula wt.
moles => grams => moles x formula wt.
This problem:
moles NaOH = 6.11g/40g/mole = 0.1528 mole NaOH
In an experiment, how many variables should you change at a time? And why?
Answers
Answer:
it should test one variable at a time.
Explanation: because you will not be able to tell which variable is responsible for the observed results.
Hopefully you can see the picture okay! But please help!!
Answers
Answer:
More carbon was released then was absorbed
Explanation:
2. Have you ever seen a natural event that surprised
you? Why was it surprising?
Answers
Answer:
I have seen many lightning storms before. However, one of the most surprising ones was when I was at my house. It was around midnight when I awoke from the sound of lightning in the distance. I was also half awake so this could be another reason this was the most surprising, but lightning struck near my area. i could see the light through my curtains and the sound was loud enough to awake everyone in my house, even the deep sleepers. I practically jumped out of bed.
Find a room that can be made completely dark. In the room, tape the pieces of construction paper on a wall, slightly above eye level. Turn on the flashlight, and turn off the lights in the room. Hold the flashlight over your head and angle it down slightly so the light hits the colored paper. Can you see the light traveling through the room before it hits the paper?
Answers
Answer:
Yes, I can see the light traveling through the room before it hits the paper.
Explanation:
edmentum
Since light rays travels in a straight line, the light traveling through the dark room can be seen before it hits the paper.
What are light rays?Light rays refers to a straight line path through which light waves travel.
Light rays travel in a straight line and this phenomenon is known as the rectilinear propagation of light.
In a dark room, the path of light rays travelling in a straight can be seen.
Therefore, the light rays traveling through the room can be seen before it hits the paper.
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Why does an atom tend to fill its outer energy shell?
Answers
Explanation:
atoms will tend to completely fill their outer shells and will bond with other elements to accomplish this goal by sharing electrons, accepting electrons from another atom, or donating electrons to another atom.
Which statement best describes the polarity of the molecule Sil4?
Answers
Answer:
I dont a picture
Explanation:
but the answer is 24
A structure that contains a watery fluid which protects the embryo/fetus is 7 7 point
known as? *
chorion
amnion sac
uterus
cervix
Answers
Answer:
and unborn baby
Explanation:
an unborn baby
help 4 me???? ples????
Answers
Answer:
its the first one.
Explanation:
If sodium loses an electron, it now has 11 protons, 11 neutrons, and only 10 electrons, leaving it with an overall charge of +1