Answer:
4.65 moles of Si.
Explanation:
Based on the descriptions in the passage, which scientist proposed a model of the atom that matches the
diagram?
Answer:
J. J. Thomson
Explanation:
This is called the plum pudding model which was proposed by J. J. Thomson.
What is the chemical formula for dinitrogen monoxide?
А
NO
B
NO
С
2NO2
D
N20
Answer:
N20
Explanation:
Using the mole ratio, how many moles of NH3 are produced when 0.60 mol of nitrogen reacts with hydrogen in the equation N2 + 3H2 --> 2NH3?
Answer:
1.2 moles of NH3 are produced
Please help me ASAP!!!!!!!!!
Temperature of Gas (degrees C)
Near 0 degrees C 3°
Near 20 degrees C 21°
Near 40 degrees C 40°
Near 60 degrees C 57°
Near 80 degrees C 82°
Near 100 degrees C 98°
Height of the column of gas (cm)
5.7 cm
6.2 cm
6.7 cm
6.9 cm
7.4 cm
7.8 cm
Temperature of gas (K)
276 k
294 k
313 k
330 k
355 k
371 k
Volume of gas (cm^3)
0.72 cm
0.78 cm
0.84 cm
0.87cm
0.93 cm
0.98 cm
Ratio V/T (cm^3/K)
0.72/276
0.78/294
0.84/313
0.87/330
0.93/355
0.98/371
Graph!
1. Make a scatterplot of temperature (K) vs. volume (cm^3)
2. Use a regression calculator (Excel works fine) to determine the equation of the line of best fit for the scatterplot.
3. Determine R. A value close to 0 indicates that there is not a linear relationship. A value near +1 indicates that the data is strongly linear.
4. If the Volume-intercept is close to 0, volume and temperature (in K) are proportional.
Explanation:
chemical analysis of a compound shows that it contains 0.99g lead ,0.154g sulfur and 0.306g oxygen. what is the empirical formula of the compound.
Chemical analysis of a compound shows that it contains 0.99g lead ,0.154g sulfur and 0.306g oxygen. what is the empirical formula of the compound.
What is gas law?This can be solved by using one of the different gas laws. This is shown below:
PV / T
Given:
P1 = 0.98 atm
V1 = 212 cm^3
T1 = 293 K
P2 = ?
V2 = 196 cm^3
T2 = 308K
Substituting to the relation:
P1V1/T1 = P2V2/T2
(0.98 * 212)/293 = (P2 * 196)/308
P2 = 1.114 atm
For this we use general equation for gases. Our variables represent:
p- pressure
v-volume
t- temperature
P1V1/T1 = P2V2/T2
in this equation we know:
P1,V1 and T1, T2 and V2.
We have one equation and 1 unknown variable.
P2 = T2P1V1/T1V2 = 1.1atm
We know that when two lines cross each other forming four angles, such that, each pair of opposite angles are equal to each other. This pair of angles are known as Vertical opposite angles.
Similarly, ∠KML = ∠JML = 25°.
Therefore, Chemical analysis of a compound shows that it contains 0.99g lead ,0.154g sulfur and 0.306g oxygen. what is the empirical formula of the compound.
Learn more about oxygen on:
https://brainly.com/question/13370320
#SPJ7
What is the formula of cell respiration? (In a science equation)
Answer:
Hey mate....
Explanation:
This is ur answer.....
Equation : Cellular Respiration: C6H12O6 + 6O2 → 6CO2 + 6H2O.
Hope it helps u,
Mark me as the brainliest....
FOLLOW ME!!!!
Answer:
C6H12O6 + 6O2 → 6CO2 + 6H2O.
Explanation:
how many moles of sodium will react with water to produce 2.0 mol of hydrogen in the following reaction?
2Na(s) + 2H20(1) - 2NaOH(aq) + H2(g)
Answer: 4.0 moles of sodium will react with water to produce 2.0 mol of hydrogen
Explanation:
The balanced chemical equation is:
[tex]2Na(s)+2H_2O(l)\rightarrow 2NaOH(aq)+H_2(g)[/tex]
According to stoichiometry :
1 mole of [tex]H_2[/tex] is produced by = 2 moles of [tex]Na[/tex]
Thus 2.0 moles of [tex]H_2[/tex] are produced by =[tex]\frac{2}{1}\times 2.0=4.0moles[/tex] of [tex]Na[/tex]
Thus 4.0 moles of sodium will react with water to produce 2.0 mol of hydrogen
QUESTION 8
DOK 4
Watch later Share
Imagine that an atom of Fluorine (F) can bond with one
of the following atoms. Which one do you think it is
most likely to bond with? Why?
Lithium (Li)
Beryllium (Be)
Boron (B)
Carbon (C)
For more videos,
check out:
Click to answer
ne
T
www.video
chemistry
textbook.com
Youlube
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SUBMIT
13:22 / 16:52
СС
Answer:
Li
Explanation:
F is a strongest electronegative element and it will combine with an element with low electronegativity. From the list provided, the element is Li.
Balance chemical equation Calcium hydroxide + carbon dioxide = calcium carbonate + water
Answer:
yaeh
Explanation:
a)Ca(OH)
2
+CO
2
⟶CaCO
3
+H
2
O
No. of atoms:Ca−1;O−4;H−2;C−1
b)Zn+AgNO
3
⟶ZnNO
3
+Ag
No. of atoms:Zn−1;Ag−1;N−1;O−3.
CAN SOMEONE PLEASE SEND ME A GOOD PICTURE OF A WATER CYCLE WITH ALL THE THINGS THAT HAPPEN IN A WATER CYCLE PLS HELP ME FAST!!!(because I need to draw it for class and I can find good pics, btw they didn’t have the subject science so yea)
Here you go I hope this helps
What do the planets Earth and Mars have in common?
A Presence of an atmosphere and a gas surface composition
B Presence of an atmosphere and a rock surface composition
C Presence of moons and rings
D Presence of rings but no moons
Answer:
the answer is D
Explanation:
because I had a test that had this question and I got it correct
please help
Differentiate between the three systems of rearing pigs.
this is ur answer
plzzz mark me as brainliest
What is the chemical formula for the molecule
represented by the model?
CHO
o C4H₂O₂
O C H2O
O C3H802
Answer: it’s the third one
Explanation:
Balance the equation by putting the correct number in front of each compound. You can work this out mathematically or by drawing pictures on a piece of paper like the videos.
NH3 --> H2 + N2 ammonia dissolving
Answer:
2NH3 --> 3H2 + N2
Explanation:
It's hard to explain how I got these coefficients but I recommend watching Tyler DeWitt on Youttube. He explains tons of chemistry concepts in an easy and clear way. I always watch his videos when I don't understand something.
I would type in "How to balance chemical equation" by Tyler DeWitt
When describing a solution, which of the following statements are true:
A) one substance is dissolved into another C) requires chemical separation
B) heterogeneous D) always involves the combination of a solid with a
liquid. E) All of these descriptions are true
Answer:
E) All of these descriptions are true
How is a planet different from a moon? (2 points)
a
A planet orbits around the sun, while a moon orbits around a planet.
b
A planet orbits around a moon, while a moon orbits around the sun.
c
A planet is dull, while a moon is bright and shiny with a bright tail behind it.
d
A planet is made of rock, while a moon is made of ice, rock, gas, and dust.
Answer:
A
Explanation:
I just know.
stoichiometrically when 0.01 kg of CaCO3 is heated to produce CO2, occupied a volume at STP is
a. 2.2414 dm^3
b. 22.414 dm^3
c. 22414 dm^3
d. 224014 dm^3
Answer:
anjsbzhahxbVAbzbsbsbsbsjsjsdp
A mixture of PCl5(g), PCl3(g), and Cl2(g) is in a 1.00 L reaction vessel. The total pressure of the reaction system is 1.40 atm at equilibrium. Then the volume of the reaction vessel is reduced from 1.00 L to 0.50 L and equilibrium is re-established at constant temperature. What is the total pressure of the system at this point?
Answer:
The total pressure immediately after the volume reduction is 2.8 atmospheres
Explanation:
The question parameters are as follows;
The initial volume of the reaction vessel, V₁ = 1.00 L
The initial pressure of the reaction system, P₁ = 1.40 atm
The final volume of the reaction system, V₂ = 0.50 L
With the assumption that the gas mixture behaves as an ideal gas, and the temperature is constant, by Boyle's law we have;
P₁·V₁ = P₂·V₂
Where;
P₁ = The initial pressure in the reaction vessel
V₁ = The initial volume in the reaction vessel
P₂ = The total final pressure in the reaction vessel after the reduction in the vessel volume
V₂ = The final volume in the reaction vessel
∴ P₂ = P₁·V₁/V₂
From which we have;
P₂ = 1.40 atm × 1.00 L/(0.50 L) = 2.8 atm
The total final pressure in the reaction vessel, P₂ = 2.8 atm.
do i look phat in this dress?
Answer:
Very!
Explanation:
Very phat!
How many oxygen molecules are in this compound: H2O
Answer:
1 oxygen molecule is present in H₂O
Explanation:
How to find out?
There's a 2 beside H in H₂O showing that there are '2 atoms of hydrogen'
However there's no number to the right of Oxygen, so it is just 1.
HELP PLEASEEEE!!!!!!!!
Nitrogen (N)) reacts with hydrogen (H) to produce ammonia (NH3). Represent this reaction in terms of:
Particles
b. Moles
C. Mass
Answer:
C the answer is c
Explanation:
ITS C
i just need an explanation :) so the problem was " what is the mass of 5 molecules of water(H2O) , in grams?" my teacher said the answer is 1.50 x 10^-22 but i dont understand why. why is it not 1.50 x 10^24, why is the exponent negative?
Answer:
Explanation:
The exponent is negative because water molecules are absolutely tiny. You can't see a molecule of water on the palm of your hand with your naked eyes, right? If a the mass of a molecule was 1.50 x 10^24, it'd be HUGE... like absolutely massive (possible the size of your city). Molecules are just tiny, tiny particles
Which of the following are decomposition reactions? ch4 (g) + o2 (g) → co2 (g) + h2o (l) cao (s) + co2 (g) → caco3 (s) mg (s) + o2 (g) → mgo (s) pbco3 (s) → pbo (s) + co2 (g)
Answer:
I cant really see the individual problems very well but i hope this helps
Explanation:
Decomposition = one thing -> 2 or more things
Synthesis= 2 or more things -> 1 thing
Ice was heated at a constant rate. Eventually all ice changes to gas.
What change of state occurs between 200 and 750.
Answer:
100°C And will be same. Your best bet is to calculate your answer. Explanation:
What is mass of 1.25 mol of H2?
H=1.01
Answer:
5/4 I think this is my first anser
Write the answer in scientific notation when you multiply 2 x 104 by 3 x 104.
Answer:
6× 10⁸
Explanation:
We need to find the multiplication of 2 x 10⁴ by 3 x 10⁴.
2 x 10⁴ × 3 x 10⁴
= (3 × 2) x 10⁴ x 10⁴
= 6 x 10⁴ x 10⁴
= 6 × 10⁴⁺⁴
= 6× 10⁸
Hence, the required answer is 6× 10⁸.
Can someone help me with the first answer ?
Extra points
Explanation:
I'm pretty sure it's; because of the invention of the microscope, scientists were able to work together to develop the cell theory.
Magnets are classified based upon how they occur either naturally or man made true or false
Answer:
True
Explanation:
Permanent artificial, temporary artificial and natural. They are classified by the way in which they have achieved magnetism and by how long they remain magnetic.
The picture below shows xylem and phloem vessels, which are tube-
like structures in a plant's roots and stems. Phloem is adapted for
transporting the glucose made during photosynthesis to the roots and
stems.
Phloem
Xylem } Vascular
stem
τρος
Xylem
Phloem
Which function is xylem specifically adapted to perform in plants?
(7.12A)
A
It helps prevent wer loss
B
It transports water from the roots to the leaves
с
It exchanges gases with the atmosphere
D
It captures sunlight for photosynthesis
Answer:
B
Explanation:
it transports water from roots to the leafs
Please help. Will give brainliest
help in what??????????????????
Can anyone explain dipoles in chemistry?
Answer:
See explanation
Explanation:
A dipole refers to a bond in which its two ends have opposite charges. A dipole results from a large difference in electronegativity between two atoms in a bond.
For instance, consider the bond between hydrogen and chlorine in HCl. The electronegativity of hydrogen is 2.2 while that of chlorine is 3.16. The significant electronegativity difference between the two atoms leads to a charge separation.
A partial positive charge appears on the atom that is less electronegative (hydrogen) while a negative charge appears on the more electronegative atom (chlorine).
This charge separation occurs because the shared electrons of the bond are more closely attracted to chlorine making it partially negative compared to hydrogen. A dipole moment now exists in the H-Cl bond hence the molecule is said to have a dipole.