Questions and answers by

Nabiha

Questions (59)

CaCO3(s) + 2HCl(aq)  CaCl2(aq) + H2O (l) +CO2(g) What’s the spectator ion in this ?
1. 1 answer
2. 3,392 views
The number of moles of cl2 produce will be ??????? If one mole of pcl5 is heated at 250 in a vessel having a capacity of 10dm³.
1. 1 answer
2. 516 views
A company assembles drills using components from two sources. Acemart supplies 91% of the components and Begud supplies the
1. 1 answer
2. 866 views
For any married couple who are members of a squash club, the probability that the husband has a degree is 2/4 and the
1. 2 answers
2. 620 views
A sixth form class consists of 6 girls and 9 boys. Three students from the class are chosen at random. The number of boys chosen
1. 0 answers
2. 615 views
The curve C with equation y=fx passes through the point (3, 14/2)given that f'(x)=2x+3/xsquared a) find f(x) (5 marks) b) verify
1. 2 answers
2. 847 views
The curve C with equation y=fx passes through the point (3, 14/2)given that f'(x)=2x+3/xsquared a) find f(x) (5 marks) b) verify
1. 0 answers
2. 499 views
how do i work out 7.25/0.25 without using a calculator???
1. 3 answers
2. 873 views
This is actually maths homework but the question sounds like geography:1)Why do you think the UK is so high up in the list for
1. 2 answers
2. 614 views
This is actually maths homework but the question sounds like geography:1)Why do you think the UK is so high up in the list for
1. 0 answers
2. 606 views
This is actually maths homework but the question sounds like geography:1)Why do you think the UK is so high up in the list for
1. 1 answer
2. 550 views
This is actually maths homework but the question sounds like geography:1)Why do you think the UK is so high up in the list for
1. 1 answer
2. 647 views
This is actually maths homework but the question sounds like geography:1)Why do you think the UK is so high up in the list for
1. 0 answers
2. 535 views
This is actually maths homework but the question sounds like geography:1)Why do you think the UK is so high up in the list for
1. 0 answers
2. 908 views
What is formed at the anode and cathode when the following solutions are electrolysed?sodium iodide copper II chloride sodium
1. 1 answer
2. 1,036 views
i need a really quick summary of chapter 2 in lord of the flies.
1. 1 answer
2. 513 views
What is formed at the anode and cathode when the following solutions are electrolysed?sodium iodide copper II chloride sodium
1. 1 answer
2. 584 views
What is formed at the anode and cathode when the following solutions are electrolysed?sodium iodide copper II chloride sodium
1. 0 answers
2. 522 views
sodium iodidecopper II chloride sodium sulphate NaOH HCl magnesium nitrate also is this true: if the metal in the compound is
1. 1 answer
2. 612 views
What is formed at the anode and cathode when the following solutions are electrolysed?sodium iodide copper II chloride sodium
1. 0 answers
2. 520 views
. Give two reasons why graphite (carbon) electrodes are used in electrolysis.5. You have 2 compounds called X and Y. X melts at
1. 0 answers
2. 1,153 views
4. Give two reasons why graphite (carbon) electrodes are used in electrolysis.5. You have 2 compounds called X and Y. X melts at
1. 1 answer
2. 1,421 views
A bike racer is riding his new bike at Silverstone. The track is 4km long.a) What is his average speed in m/s if he does a lap
1. 1 answer
2. 615 views
A bike racer is riding his new bike at Silverstone. The track is 4km long.a) What is his average speed in m/s if he does a lap
1. 0 answers
2. 1,102 views
make v the subject of the formulae:V=2v+3u
1. 2 answers
2. 1,207 views
make the letter in the bracket the subject of the formulae:v=u-3t (t) a=b-4c (c)
1. 5 answers
2. 899 views
what exactly would you observe and see at the end of the reaction of zinc and lead nitrate? include in formation about colour
1. 1 answer
2. 862 views
does this sound right for what happens with the zinc and lead nitrate reaction? could i add anything else?The zinc displaces the
1. 2 answers
2. 869 views
why does zinc and lead nitrate react?
1. 2 answers
2. 864 views
what do you observe in the displacement reaction of zinc and lead nitrate?also, what is the symbol equation for this reaction?
1. 3 answers
2. 5,241 views
What do these mean in English?Tu habites dans le centre-ville? Qu'est-ce qu'il y a dans ton village? Qu'est-ce qu'on peut faire
1. 2 answers
2. 1,229 views
I have to build a poem using all of these words exactly and this is really hard. I need help so badly.a a a a all alone and and
1. 1 answer
2. 582 views
does anyone know the notes for the whole of the song ' Hallelujah' or 'my heart will go on'I have to perform them on the
1. 1 answer
2. 543 views
There's lots of entertainment: Il y a beaucoup de distractionsYou can go out: On peut sortir It's very lively: C'est tres anime
1. 3 answers
2. 661 views
How do human beings cause suffering in 'Today's world'
1. 1 answer
2. 448 views
i have to do a project about 'west end musicals'can anyone suggest how i structure his and what i should include because I don't
1. 2 answers
2. 578 views
Metals + cold water.Li, Na, K, Ca. Notes on reactions, equations or space? <<<< don't no what space or equations means. can
1. 3 answers
2. 546 views
Why did slavery last so long?Is my answer good enough 4 ten marks? What else do I need to add? Slavery lasted for so long for
1. 2 answers
2. 1,055 views
Source F:If abolotion shall take place, our interest in the West-India islands must be at an end,Seventy millions of property
1. 1 answer
2. 478 views
An essay on the following question:How is Macbeth affected when he learns of his wife's death? Consider: -The Action of Act
1. 1 answer
2. 712 views
Im not sure what this question is asking,can anyone help?Stidy sources F and G. What arguments do the writers use to justify the
1. 1 answer
2. 542 views
I need as many reasons as to why slavery lasted so long.
1. 1 answer
2. 431 views
I need loads of info on why slavery is wrong. It must say why making people live in harsh conditions is wrong aswell.
1. 2 answers
2. 469 views
How will humans evolve?What will happen to the natural world-and how will humans respond? What will happen to the global
1. 2 answers
2. 580 views
Does anyone know a quick short really good summary of the story of Macbeth? Its for my theatre programme I'm doing. I also do a
1. 4 answers
2. 1,017 views
i have to write a poem about 'your expression of the vastness of space/universe as a poem.i have all the ideas in my head about
1. 2 answers
2. 1,068 views
does anyone know any uses of isotopes?
1. 2 answers
2. 368 views
I have to do an A4 page about Isotope uses and all the websites ive gone on are too complicated for me to understand. Does
1. 2 answers
2. 428 views
Why does a pencil look broken if you hold it at an angle in a beaker of water?
1. 2 answers
2. 695 views
are there only odd numbers in the 6* tables?
1. 1 answer
2. 325 views
List all the subsets(include the null set and the set itself.a) (p) b) (p,q) c) (p,q,r) d) (p,q,r,s) By the way the brackets are
1. 0 answers
2. 539 views
The angle between an incident ray and the mirror is 30 degrees What is the angle of incidence? What is the angle of reflection?
1. 4 answers
2. 2,554 views
A room with only one window is dark even at mid-day. Explain how you could use wall-paper, furnishings and mirrors to brighten
1. 3 answers
2. 1,496 views
Explain, with a diagram, how 2 plane mirrors could be fixed at a dangerous T-junction so that motorists approaching the junction
1. 3 answers
2. 928 views
where would you find silicon dioxide outside a chemitry lab?
1. 2 answers
2. 382 views
where would you find silicon dioxide outside a chemitry lab?
1. 1 answer
2. 325 views
where would you find iron II oxide and sodium hydrogencarbonate outside a chemistry lab?
1. 1 answer
2. 489 views
where would you find calcium carbonate and sodium chloride outside a chemistry lab?
1. 2 answers
2. 931 views
Where would you find iron II sulphide outside a chemistry laboratory?
1. 4 answers
2. 436 views