A car moved 60 m East and 90 m West. What is the distance? *
the answer would be 150 m because you just add 60 and 90
A chemist observed bubbling and fizzing after adding an acid solution to a
white powdery substance in a beaker. Which of the following can be
inferred?
Answer:
a chemical reaction occured
Explanation:
bubbling and fizzing after adding a substance, most offten means a chemical reaction is happening
If 1.5 moles of NaC₂H₃O₂ are dissolved in 750g of water, what is the molality of this solution?
2.0m
1.5m
2.6m
0.9m
Answer:
2m.
Explanation:
molality = no.of moles of solute ÷ mass of solvent in kg
molalty = 1.5 moles ÷ 0.75 g
= 2m
0.225L solution of H2CO3 is neutralized by 0.0880L of a 1.22 M Fe(OH)3 solution. What
is the concentration of the H2CO3 solution?
Answer:
0.716
Explanation:
First, write the balanced equation:
3 H2CO3 + 2 Fe(OH)3 ----> Fe2(CO3)3 + 6 H2O
Second, go from the molarity of H2CO3 to liters of Fe(OH)3
(Pull mole ratio from balanced equation)
1.22/1L x 0.0880/1 x 3molH2CO3/2molFe(OH)3 x 1/0.225L
Use calculator, and you end up with 0.7157333
Round to 0.716
What is the volume occupied by 0.17 grams of gaseous H2S at 27◦C and 380 torr?
Answer:
0.25 liter
Explanation:
Trust
Should couples wanting to start a family undergo genetic testing to minimize risk to their offspring
Answer:
Yes
Explanation:
The genetic testing is also called as the DNA testing. It is mainly used for identifying the changes in the DNA sequence or the chromosomes structure. It can also measure the results in the genetic changes.
Couples those who are planning to start a family should go for a genetic testing so as to minimize a risk in the upbringing or growth of their offspring. By doing a genetic testing a couple can well know the conditions of the baby that could affect them. The result from a genetic testing can help to plan better before starting a family. Therefore, it is advisable for couples to go for a genetic testing so that they plan better by knowing the conditions.
If 1.25 g of water is heated from 20.0 degrees Celsius to 45.0 degrees Celsius and has a specific
heat of 4.18 J/gC, how much heat energy does it contain?
Answer: Heat energy contained by water is 130.625 J.
Explanation:
Given: Mass = 1.25 g
Specific heat = [tex]4.18 J/g^{o}C[/tex]
Initial temperature = [tex]20.0^{o}C[/tex]
Final temperature = [tex]45.0^{o}C[/tex]
Formula used to calculate heat energy is as follows.
[tex]q = m \times C \times (T_{2} - T_{1})[/tex]
where,
q = heat energy
m = mass of substance
[tex]T_{1}[/tex] = initial temperature
[tex]T_{2}[/tex] = final temperature
Substitute the values into above formula as follows.
[tex]q = m \times C \times (T_{2} - T_{1})\\= 1.25 g \times 4.18 J/g^{o}C \times (45.0 - 20.0)^{o}C\\= 130.625 J[/tex]
Thus, we can conclude that heat energy contained by water is 130.625 J.
Which is NOT part of the male reproduction system of a flower? stamen pollen anther pistil
Answer:
Pistil
Explanation:
I believe it is the pistil, because the pistil is part of the female reproductive system of a flower. A stamen is for the male reproductive system.
eeeeeeeeeeeeeeeeeeeeeeeeeeeee
1. Closest
2. Million
3. All
4. Sunlight
5. Heat
6. Are
7. Faster
8. Million billion
9. Protection
10. Moon
11. Never
12. Tiny
13. Living
14. Explosions
15. Solar
Have a nice day!
Answer:
1. Closest
2. Million
3. All
4. Sunlight
5. Heat
6. Are
7. Faster
8. Million billion
9. Protection
10. Moon
11. Never
12. Tiny
13. Living
14. Explosions
15. Solar
give the other person brainliest
have a good day :)
Explanation:
Find the w/w% of a solution that contains 10 grams of solute and 100 grams of solvent
Answer:
I think the w/w% of this question is 10.
The w/w% of a solution that contains 10 grams of solute and 100 grams of solvent is 9.09%
What is mass percentage % ?Mass percentage is another name of w/w % or weight /weight % .
To determine the weight/weight % of a solution :
we divide the mass of solute by mass of the solution (solute and solvent together) and multiply by 100 to obtain per cent.
[tex]\dfrac{w}{w} \; \%\; =\;\rm\dfrac{mass \;of\; solute}{mass\; of \; solute\;+\;mass\;of\;solvent} \times 100[/tex]
It is given that , mass of solute = 10 grams and mass of solvent = 100 grams
So,
[tex]\dfrac{w}{w} \; \%\; =\;\rm\dfrac{10}{10+100} \times 100[/tex]
[tex]\dfrac{w}{w} \; \%\; =\;\rm\dfrac{10}{110} \times 100\\\\\dfrac{w}{w} \; \%\; =\;\rm\dfrac{100}{11}\\\\\dfrac{w}{w} \; \%\; =\; 9.09 \;\%[/tex]
The w/w% of a solution that contains 10 grams of solute and 100 grams of solvent is 9.09% .
To know more about mass percentage :
https://brainly.com/question/16885872
#SPJ2
How many moles of acetylene are needed to completely react with 16.5g of CO2
Answer:
0.375 mols
Explanation:
Relative atomic mass Ar of C=12×1=12Relative atomic mass Ar of O=16×2=32Realitive formula mass Mr is 12+32=44mol:mass
1 : 44
x :16.5
cross multiply and get the answer
Which two planets are the largest? Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune
Answer:
Jupiter and Saturn are the two biggest planets
helppppppp plzzzzzzz
Answer:
is this done on a chrombook? it looks like it pls i need points to get to 1000 points so please just leave my answer
Explanation:
Which elements are in the compound hydrochloric acid?
A. Helium and carbon
B. Hydrogen and carbon
C. Helium and chlorine
D. Hydrogen and chlorine
Answer:
D. Hydrogen and chlorine
Explanation:
Answer:
d
Explanation:
hydrogen and chlorine
is the compound of hydrochloric acid
PLZ Help asap!!!!
Sulfuric acid is purchased full-strength at 18.0M. How many milliliters of full-strength acid are needed to prepare 500.0 mL of aqueous 0.35M H2SO4? Round your answer to 3 significant figures.
A. 13.4 mL
B. 82.6 mL
C. 9.70 mL
D. 79.0 mL
Answer:
C. 9.70
Explanation:
Hello,
This problem is a simple dilution problem which utilizes the formula M1V1= M2V2 (where M is molarity, V is volume). I have attached a helpful image as well.
M1 V1 = M2 V2
(18) (x) = (0.35) (500)
x = 9.72mL which is close enough to option C.
how many grams is needed to make the following solution?
Answer:
c
Explanation:
yxyyyxyxxyxxy yy y gg ff ff d d f t r rr rr rr rr r r t tt t
2). A student collects 425 L of oxygen at a temperature of 24.0°C and a pressure
of 0.899 atm. How many moles of oxygen did the student collect?
Answer:
15.5 moles
Explanation:
Applying,
PV = nRT.................. Equation 1
Where P = pressure, V = Volume, n = number of mole, R = molar gas constant, T = Temperature.
Make n the subject of the equation
n = PV/RT............... Equation 2
From the question,
Given: P = 0.899 atm, V = 425 L, T = 24 °C = (273+24) K = 297 K.
Constant: R = 0.083 L.atm/K.mol
Substitute these values into equation 2
n = (0.899×425)/(297×0.083)
n = 15.5 moles
A decrease in the height of the mercury column usually means the coming of a.
Answer:
Low-pressure system and clear weather.
Explanation:
Que unidad utilizamos para medir un átomo de oxígeno??
Answer:
Im pretty sure you use mass
Explanation:
Answer:
Los químicos eligen definir la AMU como 1/16 de la masa promedio de un átomo de oxígeno que se encuentra en la naturaleza; es decir, el promedio de las masas de los isótopos conocidos, ponderado por su abundancia natural. Los físicos, por otro lado, lo definieron como 1/16 de la masa de un átomo del isótopo oxígeno-16 (16O).
HEELLLP
How many liters of hydrogen gas, at STP, are required to produce 2.50 x 1022 molecules of CH4? C + 2H2 → CH4
Answer:
1.8 L
Explanation:
According to Avogadro;
1 mole of CH4 contains 6.02 * 10^23 molecules of CH4
x moles of CH4 contains 2.50 x 10^22 molecules of CH4
x = 1 * 2.50 x 10^22 molecules/ 6.02 * 10^23 molecules
x = 0.04 moles of CH4
2 moles of H2 yields 1 mole of CH4 gas
x moles of H2 gas yields 0.04 moles of CH4
x = 2 moles * 0.04 moles / 1mole = 0.08 moles of H2
x = 0.08 moles of H2
Since 1 mole of H2 occupies 22.4 L
0.08 moles of H2 occupies 0.08 moles * 22.4 L/ 1 mole
= 1.8 L
If you say an object is hot, you are feeling the transfer of
a. chemical energy
b. thermal energy
c. potential energy
d. kinetic energy
Answer:
The answer to your question is B
4. A typical human consumes 2500 Kcal of energy during a day. This is the equivalent to 10,450,000 J. Say you decided to run stairs all day. Given that there are: 24 hours / day • 60 minutes / hour • 60 seconds / minute = 86,400 seconds / day How much energy, in Joules, would you burn in climbing stairs all day?
Answer:
The amount of energy that would be burnt in climbing stairs all day is approximately 52,738,560 Joules
Explanation:
The question is with regards to an experiment with details that can be obtained from the U Oregon website
The given parameters of the question are;
The energy consumed by a human each day = 2,500 kcal = 10,450,000 J
The required parameters obtained from U Oregon website are;
The average weight of a student, W ≈ 60 kg × 9.81 m/s² = 588.6 N
The average time it takes a student to run up a flight of stairs = 5.4 s
The height of the stairs, h = 0.2 m × 28 = 5.6 meters
Therefore, we get;
Work done in climbing up the stares = W × h = 588.6 N × 5.6 meters = 3,296.16 J
The height the student can climb in a day is given as follows;
The time of 1 day in seconds, t = 86,400 s
The height the student climbs in 5.4 s = 5.6 m
∴ Vertical velocity, [tex]v_y[/tex] = 5.6 m/(5.4 s) = (28/27) m/s
The vertical height the student climbs in a day, [tex]h_{(v \, all \, day)}[/tex] = [tex]v_y[/tex] × t
∴ [tex]h_{(v \, all \, day)}[/tex] = (28/27) m/s × 86,400 = 89,600 m
The work done all day = W × [tex]h_{(v \, all \, day)}[/tex] = 588.6 N × 89,600 m = 52,738,560 J
The amount of energy in joules that would be burnt in climbing stairs all day = The work done all day = 52,738,560 Joules
Select the correct answer. Two charged objects, A and B, exert an electric force on each other. What happens if the distance between them is increased? A. The charge on B decreases. B. The charge on B increases. C. The electric force between them decreases. D. The electric force between them increases.
Answer:
The electric force between them decreases
Explanation:
The force between two charged particle is given by :
[tex]F=\dfrac{kq_1q_2}{r^2}[/tex]
Where
r is the distance between charges
If the distance between the charges is increased, the electric force gets decreased as there is an inverse relation between force and distance.
Hence, the correct option is (c) "The electric force between them decreases"
Which of the following is the correct Lewis dot structure for F2?
Answer:b
Explanation:
Correct dot
2) What is an atom? Name and give the charges of the three particles inside the atom.
answer number 12 for me
Answer:
I believe its F: 2.55
Explanation:
I know I'm very late, positive you're past this question, I'd hope at least.
pls help me ASAP
its very urgent
Answer:
C Region
Explanation:
C Region contains all the liquids as 0 °C is the freezing point of water (Crystals of water are formed leaving it no more in the liquid state) and 100 °C is the boiling point (The water boils leaving it no more in the liquid state).
Hence, All liquids are contained in the C region.
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AH180711.
The picture shows sand used to make a model of a galaxy. In the model, each grain of
sand best represents
A.
B.
a comet
a black hole
an asteroid
C.
D.
a star
Answer:
D
Explanation:
I took that.
2. Which type of energy is centered around breaking the bonds between elements in a compound?
Nuclear
Chemical
Electrical
Elastic
~I will give the brainliest~
How does temperature affect the rate constant for a reaction?
A. increasing temperature exponentially increases the rate constant
B. increasing temperature linearly increases the rate constant
C. increasing temperature exponentially decreases the rate constant
D. increasing temperature linearly decreases the rate constant
E. temperature has no effect on the rate constant