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Asked by Mahisha

General πŸ›

A pen costs $t. A pencil costs half as much as a pen. A marker cost $7 more than a pencil. A) what i...

Pen = t Pencil = t/2 Marker = (t/2)+7 If t = 10, Marker = (10/2) + 7 = $12

Asked by Dominic

General πŸ›

How is the sequence -1/1, -2/4, -3/7, -4/10, -5/13 a linear sequence? How do I find the nth term fro...

Here we can see the numerator is decreasing by one in each subsequent part of the series (-1,-2,-3,-4,etc) The denominator is increasing by 3 each t...

Asked by Dominique

Chemistry βš›οΈ

How does an atom of lithium form an ionic bond with an atom of chlorine?

Lithium β€˜loses’ its valence electron and forms a positive lithium cation. Chlorine β€˜gains’ that electron and forms a negative chloride anion. The op...

Asked by Abbie

General πŸ›

Does endothermic make the solution hot and then exothermic make it cold?

This depends upon the reaction system that you are describing... By definition, endothermic reactions take in energy (ENdo ENters), so the reaction ...

About

Experienced international teacher and school leader. Have taught Chemistry to A Level and HL IBDP and Biology to A Level at home and abroad. Successfully helped students into Russell Group and Ivy League universities.

Education

Staffordshire university

BSc Chemistry

1998 - 2001

Keele University

PGCE Chemistry and Science

2001 - 2002

University at Buffalo SUNY

MSc Multidisciplinary Studies

2014 - 2017

Educational Technology

All answers

Asked by Mahisha

General πŸ›

A pen costs $t. A pencil costs half as much as a pen. A marker cost $7 more than a pencil. A) what i...

Pen = t Pencil = t/2 Marker = (t/2)+7 If t = 10, Marker = (10/2) + 7 = $12

Asked by Dominic

General πŸ›

How is the sequence -1/1, -2/4, -3/7, -4/10, -5/13 a linear sequence? How do I find the nth term fro...

Here we can see the numerator is decreasing by one in each subsequent part of the series (-1,-2,-3,-4,etc) The denominator is increasing by 3 each t...

Asked by Dominique

Chemistry βš›οΈ

How does an atom of lithium form an ionic bond with an atom of chlorine?

Lithium β€˜loses’ its valence electron and forms a positive lithium cation. Chlorine β€˜gains’ that electron and forms a negative chloride anion. The op...

Asked by Abbie

General πŸ›

Does endothermic make the solution hot and then exothermic make it cold?

This depends upon the reaction system that you are describing... By definition, endothermic reactions take in energy (ENdo ENters), so the reaction ...

Asked by Jack

General πŸ›

What is the empirical equation for Phosphorus Oxide (P4 O10)?

As empirical formula is the simplest while number ratio, we take the actual ratio of 4:10 and simplify to 2:5 making the empirical form P2 O5...

Asked by Audrey

Biology 🌱

What would happen to cells in a solution if water is added?

This would depend on the nature of the solute, the concentration of the solution and how much water was added. ...

Compare decomposition reactions with combustion reactions?

Decomposition reactions see the reactant(s) break down into the product(s) Combustion reactions involve the reactant(s) reacting with oxygen...

Asked by Selina

General πŸ›

What's the best way to revise over the christmas holidays?

Prepare a revision timetable of many, small, focussed chunks - and then stick to it!!

Asked by Elena

Maths πŸ’―

How do you work out half equations in electrolysis?

Firstly you need to know the electrolyte and thus the cation(s) and anion(s) involved. Then you know the ions will be attracted to the oppositely ch...

Asked by Elena

Maths πŸ’―

How do you work out half equations in electrolysis?

Firstly you need to know the electrolyte and thus the cation(s) and anion(s) involved. Then you know the ions will be attracted to the oppositely ch...

How to calculate concentration of a solution?

Concentration (measured in moles per litre) = amount of solute (measured in moles) divided by the volume of solution (measured in litres) The amount...

Why is potassium more reactive than sodium?

This is todo with the structure of the atoms. Both are in Group 1 of the periodic table so have one valence (outer) electron which is relatively eas...

Asked by Bireanna

General πŸ›

What are the groups in the periodic table?

The groups are the vertical columns of the table. The members of each group exhibit similar properties to each other, which relate to their electron...

Asked by Nicole

Chemistry βš›οΈ

What is an acid and what is an alkali?

The answer to your question really depends upon the level of answer that you need. At a most basic level (excuse the chemistry pun!), acids taste so...

What is Stoichiometry in chemistry?

Stoichiometry is the ratios of reactants and products within reactions, and often encompasses the calculation of masses, moles, volumes and/or conce...

Asked by Addie

Biology 🌱

What is photosynthesis?

Photosynthesis is the process by which plants produce glucose and oxygen from water and carbon dioxide in tge presence of chlorophyll and sunlight C...

Asked by Mazie

Maths πŸ’―

Solve : 30 + 3x = 240?

Subtract 30 from each side of the equation... 30 + 3x - 30 = 240 - 30 This leaves us with... 3x = 210 If we then divide each side by 3... 3x/3 = 210...

Asked by Keira

Maths πŸ’―

Solve 5p + 7= 3(4-p)?

5p + 7 = 12 - 3p 5p + 3p + 7 = 12 - 3p + 3p 8p + 7 = 12 8p + 7 - 7 = 12 - 7 8p = 5 P = 5/8 or 0.625

Asked by Rosie

General πŸ›

Empirical formulas??

These are the simplest whole number ratios of elements within a compound. To calculate them, you must work out the number of moles of each element w...

What is an element?

In chemistry, an element is something that consists of only one type of atom.

Asked by Maggie

Maths πŸ’―

What’s Pythagoras?

I assume you refer to Pythagoras’ Theorem which relates to the length of sides of a right angled triangle. It states that the sum of the squares of ...

Asked by Nabihah

Geography πŸ—Ί

What’s a isotope?

Isotopes are atoms of the same element with different relative masses, that is to say the atoms have the same number of protons, the same number of ...

Asked by Mazie

Maths πŸ’―

Solve : 30+x=11?

In order to make x the subject of the expression we must subtract 30 from each side of the equation... 30+x-30 = 11-30 This leaves us with... X = 11...

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