Questions asked by Zain A.
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A chemist reacted 0.05 moles of solid sodium with water to form sodium hydroxide solution. The chemical reaction for this is: Na+H2O = NaOH +H2
What mass of sodium was reacted?

Calcium oxide is a base compound which can react with acids such as nitric acid, HNO3. A student mixed 1.5g of CaO with 2.5M HNO3. The chemical equation for this reaction is: CaO + HNO3 = Ca(NO3)2 + H2O. Solve the following questions?

A chemist reacted 0.05 moles of solid sodium with water to form hydroxide solution. The chemical reaction for this is: Na + H2O = NaOH + H2. What mass of sodium was reacted?

The balanced equation shows the reaction between aluminium hydroxide and hydrochloric acid to form aluminium chloride and water: Al(OH)3 + 3HCl = AlCl3 + 3H2O. 1 mole of aluminium chloride was formed, what mass of aluminium hydroxide was formed?

A) Identify the amine functional group from the compound?
B) Identify the alcohol functional group from the compound?

Name the type of bond shown and explain how it is formed?

Look at the following diagram and write below the correct electronic configuration to indicate the electronics in the s, p and d orbitals?

Which of these molecules are isomers of each other and explain why that is?

Explain briefly why the student has grouped the different bonds like this?

Write a short description of how the structure of a protein is formed. Begin your description with a single amino acid and include the terms 'primary structure', 'secondary structure' and 'tertiary structure' in your answer?

The diagram below shows one theory of enzyme action
Describe and explain what is happening at each stage. What enzyme theory does this represent?

What are some good websites for maths practice aged 15?

What are some good ways of improving poetry analysis?

See below?

Describe how the enzyme affects the rate of reaction?

How are carbohydrates broken down?

How to stay motivated to study maths and what are some good websites for practice (High school level)?

How is the structure of a protein formed?

How do you take notes quickly and effectively while understanding the content (specifically for science)?.

Why is aspirin considered to be a weak acid and how can you measure the exact pH?

Calcium oxide, CaO, is a base compound which can react with certain types of acids. A student mixed 1.5g of CaO with 2.5M HNO3. The chemical equation for this reaction is: CaO + HNO3 → Ca(NO3)2 + H2O?

Assuming that the graph of y = x^2  5x has been drawn, find the equation of the line which you should draw to solve the equation:
x^2  5x = 3?

Explain how molecule 1 can be synthesised using molecule 2 as a template?
Also, what is the name of this process?

What is the magnitude of the acceleration of the masses?

A boy of mass 40 kg is on a waterslide which slopes at 30° to the horizontal. The frictional force up the slope is 120 N. Calculate the boy’s acceleration down the slope? Take the acceleration of free fall g to be 9.81 m s−2

What are some good websites for physics?

How to prove equation of kinetic energy (KE = 1/2mv^2)?

What is the exact value of the bottom length (ie. x)?

How to solve the following question without a calculator?

How to solve the following question without a calculator?

How to solve the following question without a calculator?

How to solve 18/√3 ?

Given that the ring R is in equilibrium, use a labelled vector triangle to determine the tension X ?

Find the resultant force of W and P?

Determine force F?

Solve for x, y and z?

Solve for a, b, c, d?

1: Calculate the work done on the crate by:
 the 200 N force
 the weight of the crate
 the normal contact force N.
2: Calculate the rate of work done against the frictional force F. ?

Factorise #3x^2 + xy  2y^2# ?

In triangle RPQ,
RP = 8.7 cm
PQ = 5.2 cm
Angle PRQ = 32°
(a) Assuming that angle PQR is an acute angle, calculate the area of triangle RPQ?
Give your answer correct to 3 significant figures

What is the vertical component of the resultant force on the balloon?

How to factorise: #a^4 a^2b^2  2b^4=0 # ?

Assuming that the ball does not hit the floor within the first second of motion, which of these graphs represents the speed of the ball plotted against time?

Work out the area of triangle ABC?

Prove that the straight line is tangent to the circle?

Solve this question please?

Solve please?

Prove that DE is parallel to BC?

Find equation M?

What is osmosis (and how is it different to diffusion and active transport) ?

What is the wavelength (in cm) and the period (in seconds)?

Show that?

Why is angle APD 116 degrees?

Find value of y when x = 45?

Displacement from origin?

Work out the area of triangle ABC?

Solve gf(x) = 1?

Calculate the length DP?

How do you find the nth term of the following sequence:?
#9, 4, 5, −18, −35#

The minimum point of a quadratic curve is (1, −4). The curve cuts the yaxis at −1.
Show that the equation of the curve is y = 3x2 − 6x −1?

A box is on a table.
The area of the box in contact with the table is 1500 cm2.
The pressure on the table is 28 newtons/m2.
Work out the force exerted by the box on the table ?
Give your answer correct to the nearest whole number.

Explain, as fully as you can, why syrup (concentrated sugar solution) was produced after two hours?

What is the frequency of a wave of red light in the air where its wavelength is 6.8×10−7m?

Calculate the wavelength of Radio 4 which broadcasts on a frequency of #"198 kHz"# ?