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Jack
Questions and answers by visitors named
Jack
, page 9
Questions (1,125)
Jaline can purchase tile at a store for $0.99 per tile and rent a tile saw for $24. At another store, she can borrow the tile
3 answers
946 views
Why some things we learn about in school won’t help us in real life.
Why is this true? Why do teachers do this?
5 answers
383 views
The velocity of a particle is given by v=2x+1 cms^-1. If the particle is initially at the origin, find what the displacement
4 answers
428 views
What is meant by resistive force?How to find the total resistive force in velocity time graph at certain time if weight of body
2 answers
496 views
I have a question of velocity-time graph in which a girl throws ball from the top of cliff.The ball has mass of 250 g. How to
3 answers
425 views
How to find tension if period of constant velocity is given?
1 answer
327 views
How to find time if the body acceleration , mass and tension with which it is pulled given?
1 answer
277 views
What is meant by vertical component of velocity?
1 answer
409 views
A ball is thrown horizontally from the top of a building.
The ball is thrown with a horizontal speed of 8.2 ms^-1. The side of
4 answers
2,882 views
Why was capturing Quebec so important to the British during the French and Indian war
3 answers
758 views
Find k such that f(x) = x^4-kx^3+kx^2+1 has the factor x+2
4 answers
1,365 views
Why were slaves in hind the land in the Southern colonies?
1 answer
411 views
Allegiant Airlines charges a mean base fare of $89. In addition, the airline charges for making a reservation on its website,
2 answers
1,167 views
A Metal sphere A has a charge of +6 units and an identicalmetal sphere, B, has a charge of -4 units. If the spheres are brought
3 answers
1,582 views
What concentration of Ag+ is in equilibrium with 3.0×10−6 M Co(CN)3−6 and Ag3Co(CN)6(s)?
1 answer
395 views
A grasshopper leaps into the air from the edge of a cliff at a 47 degree angle. He reaches a maximum height 6.49 cm above the
3 answers
663 views
How many grams of H are in 1 mole of methane?
Really having trouble with this and any help would be really appreciated
1 answer
285 views
Step 1: Carbon is burned in a limited supply of oxygen to form carbon monoxide. Step 2: The carbon monoxide formed in Step 1 is
4 answers
763 views
What mass (g) of Na2CO3 would be needed to react with 0.250 moles of HCI according to the equation
Na2CO3 + 2HCI ---> 2NaCI + CO2
3 answers
411 views
What is the %w/w of a 500 mL solution of HCl that has a density of 1.169 g/mL and was made using 386 g of water?
I'm having a lot
5 answers
688 views
How much CaCl2.6H2O and water must be weighed out to make 100 g of a solution that is 5% CaCl2 by mass?
Thanks to anyone who
4 answers
926 views
If a solution is made by dissolving 1g of NaCl in sufficient water to make 10g of solution, the composition of the solution is
3 answers
431 views
If a solution is made by dissolving 1 g NaCl in sufficient water to make 10 mL of solution, the composition of the solution is
6 answers
488 views
MnO4¯ + 8H^+ +5Fe^2+ → Mn^2+ + 4H2O + 5Fe^3+
Which ones underwent oxidisation and reduction. My answer is Mn and O went
4 answers
1,357 views
An aqueous solution labelled 35.0% w/w HClO4 has a density of 1.251 g cm¯3. What is the molarity of the solution?
My first
5 answers
1,801 views
Balance the following in basic solution: Al(s) + CrO42¯(aq) → Al(OH)3(s) + Cr(OH)4¯(aq)
Can someone please help me do this. I
2 answers
1,145 views
Give the half-equations for the reaction between aluminium metal and liquid bromine (Br2):
2 answers
656 views
Give the completely balanced equation stoichiometry for the following unbalanced equation: a Cu + b NO3¯ + c H+ → d Cu2+ + e
1 answer
359 views
To compress a sample of gas from 2.5 litres at 1.8 atm pressure to a volume of 1.5 litres, what should the value of the pressure
4 answers
732 views
In a gaseous mixture of CH4 and C2H6, there are twice as many molecules of CH4 as C2H6. The partial pressure of CH4 is 40 mmHg.
5 answers
876 views
If 200 cm3 of H2 gas contained in a cylinder under a pressure of 1200 mmHg are forced into a cylinder whose volume is 400 cm3
4 answers
706 views
The partial pressures of the four gases contained in a 6 L cylinder at 100 °C were: CO2 = 63.1 atm; H2 = 21.1atm; CO = 84.2
5 answers
863 views
Calculate the enthalpy change for the reaction: Zn (s) + S (s) + 2 O2 (g) → ZnSO4 (s) ΔH = ? kJ by using the following data:
Z
4 answers
3,480 views
In the decomposition of CaCO3 a gas is produced: CaCO3 (s) → CaO (s) + CO2 (g). Predict the change in entropy for this
3 answers
722 views
The enthalpy of atomisation is the enthalpy change upon breaking the bonds of 1 mole of a gaseous compound into its atom
4 answers
1,193 views
A student in a lab heats up 50 g of water using a Bunsen burner and an insulated cup to ensure no heat loss to surroundings. The
3 answers
554 views
Which of the following is NOT a spontaneous reaction?
a. Ice melting at 25 °C under atmospheric pressure b. Water freezing at 25
3 answers
698 views
How many grams of H are in 1 mole of methane?
I don't understand this. I got 16.1 but it's wrong. Any help is much appreciated
4 answers
342 views
How many moles of ammonia will contain 1.55 x 1021 atoms of hydrogen?
Thanks for any help
3 answers
421 views
a) Fe2O3 b) Ca3P2
How many atoms of each element are contained in 200 g of each of the above compounds?
3 answers
387 views
An aqueous solution labelled 35.0% w/w HClO4 has a density of 1.251 g cm¯3. What is the molarity of the solution?
My answer is
4 answers
1,023 views
A solution is made by dissolving 6.4 g of bromine (Br2) in enough CCl4 to make 80 mL of solution. What is the molarity of the
4 answers
684 views
Consider the following two equations used in the preparation of KMnO4:
2 MnO2 + 4 KOH + O2 → 2 K2MnO4 + 2 H2O 3 K2MnO4 + 4 CO2
3 answers
685 views
What is the molarity of a solution which contains 10.0 mg aluminium ions per cm3 solution?
Thanks to anyone who helps
1 answer
271 views
150.0 mL of 0.105 M aluminium sulfate is mixed with 250.0 mL of 0.198 M barium chloride. What mass of barium sulfate would be
7 answers
406 views
By means of ion/electron part equations, write fully balanced equations for the following reaction: the production of hydrogen
3 answers
384 views
Exactly 500 cm3 of nitrogen is collected over water at 25°C and 755 mmHg. The gas is saturated with water
vapour. Calculate the
3 answers
544 views
For the gaseous compound C3H8, calculate the density of the gas in g L–1 at 0 °C and 1 atm.
I'm pretty sure I have to us
3 answers
956 views
For the gaseous compound C3H8, calculate the partial pressure of C3H8 in a gaseous mixture of equal masses of C3H8 and CH4 at
3 answers
530 views
Simplify. Express each answer with positive exponents.
5a(-2ab^2)(-3b^3)
1 answer
453 views
What mass of CH3CH3 will contain 18.65 g of carbon?
I'm getting so confused with this Q. Any help is very much appreciated.
1 answer
287 views
I really need help!!! I was out of school for a week because I was visiting my grandmother and I missed school I took vacation
7 answers
472 views
Hi, can you help me create an attention grabber in which someone breaks the law to honor their loved one?
1 answer
277 views
x^2+9x+20=0
Solve using quadratic formula
2 answers
487 views
An urn contains white and green balls. Six balls are randomly drawn from the urn in succession, with replacement. That is, after
2 answers
685 views
A 210 degrees of a sector of radius 5cm is bent on form cone. For the fone formed find a.the base radius of the cone b.the
3 answers
763 views
Consider the function below.
A(x) = x squt (x + 12) Find the local maximum value I tried to plug in f(-12) in to A(x) results = 0
3 answers
397 views
I have a very important test (mathematics).
I need help with quadratic equations and trapezoid calculator, I can't understand
1 answer
334 views
A recent forest fire near Littleville destroyed four-fifths of the trees in Bigtree National Forest. The forest covers 4920
4 answers
636 views
Evaluate the following expression: [5 - (5 - 7(6 - 3) + 4)] + 2
1 answer
234 views
A blue and a green billiard ball, each with a mass of 0.15 kg, collide directly. Before the collision, the blue ball had a speed
6 answers
2,369 views
what woukd the shaded region be if one circle had the radius of 9 and the other circle had a radius of 4?
1 answer
186 views
Explain why the demand for workers increases as they become more productive, even though higher productivity means a worker will
1 answer
317 views
The measure of angle X is 9 degrees more than twice the measure of angle Y. If angle Upper X and angle Y are supplementary
3 answers
1,196 views
There are some goats, cows, and sheep on a farm. 2/5 of the animals were goats. There are 3 times as many sheep as cows. If
4 answers
1,229 views
Which period is older than the Triassic period?
Cambrian Cretaceous Jurassic Paleogene
1 answer
1,003 views
An excess of silver nitrate solution was added to 10.0cm3of sodium chloride solution, and 0.717g of silver chloride was
4 answers
1,323 views
Passage: Not much can be achieved by the naked hand or by the unaided intellect. Tasks are carried through by tools and helps,
1 answer
327 views
rip so hard to win like this 3 2 1 Let It Rip like that
1 answer
159 views
State the integers represented by -4 < x < 2
1 answer
194 views
Could i get some help please? thank you
The Peace Corps carries forth the idea that Americans have a vast ability to help the
1 answer
251 views
Hi. I'm new here. I don't use brainly any more because it's not working and I hate the moderators. I don't know much about this
2 answers
272 views
The product of b and 8 is less than 20.
1 answer
161 views
If you roll a number cube (die), what is the percent of rolling a one or two?
7 answers
458 views
tanh^-1x=ln((1+x)/(1-x))/2
1 answer
243 views
Lea is reading a book that is 165 pages. She reads 15 pages each day. Which equation can be used to determine the number of
1 answer
253 views
The sum of the lengths of the sides of one triangle equals the sum of the lengths of the sides of a second triangle. Are the two
5 answers
1,839 views
1. Rewrite the following passage in first person AND in third person omniscient: EighteenFiona on his left, was called. Jonas
1 answer
334 views
The students make a line plot named "Candles Sold." Which of the following is a good scale for their line plot?
3 answers
254 views
How would you do this problem, I am stuck.
Find the Taylor series of f(x)=1/x centered at x=2.
2 answers
505 views
What information is represented in a chemical formula
3 answers
339 views
Hannah’s favorite toy character is sold wearing one of many outfits. An outfit consists of one shirt, one pair of pants, and
3 answers
766 views
Based on the chemical reaction below, answer the following questions:
2NH3 + 3CuO ---> 3Cu + N2 + 3H2O 1. How many grams of CuO
2 answers
516 views
Based on the chemical reaction below, answer the following questions:
2NH3 + 3CuO ---> 3Cu + N2 + 3H2O 1. How many grams of CuO
1 answer
344 views
A bag contains 4 blue marbles, 10 green marbles, and 11 yellow marbles. You draw a marble, put it back in the bag, and then draw
3 answers
499 views
Suggest two things that one can do before writing the test or examination to reduce anxiety or stress
3 answers
351 views
A flower shop plans to make an outdoor garden sales area. It is in a rectangle on the main store. The garden area will be fenced
1 answer
237 views
You have 300 feet of fence. You need to build a garden, where 3 walls are fence and the 4th wall is your house. What is the
1 answer
304 views
When P(x) is divided by (x-1) and (x+3), the remainders are 4 and 104 respectively. When P(x) is divided by x^2-x+1 the quotient
2 answers
846 views
Sketch a graph of a fifth-degree polynomial f(x) such that f(x) < 0 when x< -2 or 4 < x < 7, and f(x)>0 when -2<x<0, 0<x<4 or
1 answer
423 views
Sketch a graph of a fifth-degree polynomial f(x) such that f(x) < 0 when x< -2 or 4 < x < 7, and f(x)>0 when -2<x<0, 0<x<4 or
1 answer
184 views
When P(x) is divided by (x-1) and (x+3), the remainders are 4 and 104 respectively. When P(x) is divided by x^2-x+1 the quotient
1 answer
200 views
The low temperature during 4 days in August were 83 degrees, 80 degrees, 82 degrees, and 83 degrees.
What was the mean low
1 answer
212 views
find the area of a rectangle with a length of (x^2+2x-3) and a width of (x+6)
3 answers
223 views
Why can't the Eukaryotic cell function or exist without the Endomembrane system?
1 answer
153 views
You deposit $4000 in an account that pays 8 % interest compounded semiannually. After 2 years, the interest rate is
3 answers
499 views
What was the main result of the encomienda system?
1 answer
204 views
write 3.504 in expanded, word and fraction form
3 answers
361 views
On a coordinate grid with both the x values and the y values between –6 and 6 represent: a) x > 4
1 answer
170 views
A spinner with 15 equal parts is spun one time what is the probability that the result is a multiple of 6 or 4
4 answers
1,978 views
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