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Marrion
Questions and answers by
Marrion
Questions (35)
Which reactants could be used safely to prepare potassium chloride?
1. aqueous potassium hydroxide and dilute hydrochloric acid
4 answers
asked by
Marrion
2,047 views
A variety of snail has an inherited condition that affects the thickness of the shell. The alleles are t and n.
tt have thick
4 answers
1,145 views
Help! I've tried this question and i don't come to a correct answer!
The value of a property depreciated by 3.25% between 1997 to
1 answer
332 views
The size of a country on a map with scale of 1:50000 is reflected as 2730.8cm^2, and the coastline is reflected as 386cm. The
1 answer
853 views
Given that a^2+b^2=2 and that (a/b)= tan(45degee+x), find a and b in terms of sinx and cosx.
I don't know what i'm supposed to
2 answers
590 views
How should i integrate (4cos^2 - 1)?
Do I use a certain formula??
1 answer
450 views
Find the values of b and c for which x^2+bx+c is a factor of 2x^3-3x^2-3x-5
Ok, i've tried to find a factor of the quadratic
1 answer
468 views
A circle has the equation x^2+y^2-4x+6y-12=0
and i have already found that the centre has a coordinate of (2,-3), and a radius of
4 answers
847 views
Given that (2^3x) x (7^2x) = 7^(x-1) x 2^(2x+2), find 14^x without using a calculator.
1 answer
361 views
Question: Given that (2^3x) x (7^2x) = 7^(x-1) x 2^(2x+2), find 14^x without using a calculator.
1 answer
320 views
Given that a^2+b^2=2 and that (a/b)= tan(45degee+x), find a and b in terms of sinx and cosx.
I don't know what i'm supposed to
2 answers
587 views
This is the question: "Find the values of b and c for which x^2+bx+c is a factor of 2x^3-3x^2-3x-5." I was suggested to use long
1 answer
435 views
i'm studying A Midsummer Night's Dream, and i am a bit confused about the marriage of Theseus and Hippolyta. Please help!
In act
2 answers
645 views
A 0.1mol/dm^3 aqueous solution of phosphoric (V) acid, H3PO4, is mixed with a 0.1 mol/dm^3 of aqueous solution of sodium
3 answers
1,012 views
elements x and y are from group 7 in the periodic table. x is a liquid at rtp, while y is a solid at rtp. which statements are
2 answers
873 views
In which reaction does the smallest percentage change in volume occur?
a) C3H8 (g) + 5O2(g) ---> 3CO2(g) + 4H2O(l) b) 4NH3(g) +
4 answers
1,705 views
In which reaction does the smallest percentage change in volume occur?
a) C3H8 (g) + 5O2(g) ---> 3CO2(g) + 4H2O(l) b) 4NH3(g) +
2 answers
603 views
What is the role of bacteria in the making of yoghurt from milk?
1. to make alcohol 2. to make carbon dioxide 3. to make lactic
3 answers
547 views
I'd like to know, how many chromosomes are there for humans?
(Correct me if i'm wrong) There are altogether 46 chromosomes, (or
2 answers
934 views
The female mosquito is an effective vector for malaria. What makes it an effective vector?
1. it has wings 2. it lays many eggs
3 answers
439 views
Inorganic fertiliser is applied each year to fields bordering a lake. the fertiliser runs off into the lake and causes six
2 answers
547 views
If i do a starch test on a plant cell that comes from a plant exposed to sunlight, which parts of the plant cell will be stained
3 answers
630 views
Which method of birth control prevents the implantation of the fertilised egg?
1. coil (mechanical) 2. condom (mechanical) 3.
1 answer
472 views
Which blood vessel contains blood that has high oxygen concentration, low carbon dioxide concentration, and high pressure?
1.
5 answers
1,059 views
Which is the most direct way that the carbon in starch stored in cereal grain can be released to the atmosphere as carbon
2 answers
601 views
What is the percentage of oxygen in expired air when a person is resting?
2 answers
1,359 views
A person has the blood group AB, what determines this blood group?
a) different alleles on different chromosomes b) different
2 answers
506 views
Does Sodium and potassium react with steam? Or is the reaction too violent to speak of?
1 answer
366 views
How do i combine 2 half ionic equations into an overall equation??
4OHˉ → 2H2O + O2 + 4e 2H+ + 2e → H2 *The "H+" is the
1 answer
446 views
1. Urea is made where? Is it in the kidneys or the liver?
2. Which trophic level gets the least amount of energy? a) producers b)
1 answer
459 views
Please check my workings to see if i'm correct, thanks!
Find the percentage of nitrogen by mass in Ammonium nitrate, NH4NO3.
1 answer
452 views
Which trophic level gets the least amount of energy?
a) producers b) herbivores c) carnivores d) decomposers I think the answer
2 answers
908 views
Please help me, i don't know how to approach this question!
All ammonium salts on heating with sodium hydroxide produce ammonia
4 answers
1,140 views
I posted a question earlier, and i'm still abit confused. What is the reaction between potassium and aqueous sodium chloride? I
1 answer
688 views
I read on the textbook a sentence like this:
"The melting and boiling points of alkanes increase as their molecular sizes
1 answer
495 views
Answers (18)
You mean "v" is an unknown? You cant solve an unknown without an equation.
sorry! There's a mistake. the four choices are: 1. nucleus 2. cell wall 3. chloroplast 4. vacuole So which one is the correct option?
thanks
thanks
= 3 = When jellyfish reach adulthood they are about 95% water, so they are about the same density as water. That's why they float. Hope that's the answer you're looking for. :)
sorry i submitted the question twice i think .
alright, i found the answer already.
I see! Thanks!
I answered your previous question, and i think you should understand... but, anyways, you should know that all straight lines have the general equation y=mx+c. M being the slope/gradient, and c being the point at which the line cuts the y axis, also known
ok, the general equation of a line is y=mx+c, with m being the gradient, and the c being the y-intercept. so you already know that the line would be y=-4x+c. They told you a point on the line, so you subt that in. With x being -6, and y being 7. So, you
what's your question?
1) (x+5)(3x-3) 2) 3x(x-1)
yes, 3
correct.
You mean factorize? bring out 5 from both sides. It's the highest common factor of both sides: 5(9c+5d)
Dont use a calculator. Just multiply the numerators together and the denominators together. You should get -234/64800
You factorize the quadratic funtion on the left. x²-7x+10>0 (x-2)(x-5)>0 So the answer should be: x5
Sorry i know how to do this already.
