24 Answered Questions for the topic Chemistry Science

AP Chemistry Reaction HW Problem

I was given the equation: Ca(OH)2 + H3PO4 --> H2O + Ca3(PO)4, which I balanced to:3 Ca(OH)2 + 2 H3PO4 --> 6 H2O + Ca3(PO)4I am supposed to finda) How many grams of calcium phosphate are... more

Hydrchloric acids

When calcium carbonate is added to hydrochloric acid, calcium chloride, carbon dioxide, and water are produced.  CaCO3 + 2HCl = CaCl2 (aq) + H2O + CO2 A.)How many grams of calcium chloride will be... more

Question about how significant digits work in chemistry.

I'm doing my online chemistry summer class and significant digits are included, of course. But I'm confused about them because everything I believe is being contradicted. Here's what I... more

make a judgement as to whether if stem cells research issues are important enough to stop the development.

does anyone know a judgement based on stem cells research and how it is important enough to stop the development I need help.

A solution is made by dissolving 10.20 grams of glucose (C6H12O6) in 355 grams of water. What is the freezing point depression of the solvent if the freezing po

A solution is made by dissolving 10.20 grams of glucose (C6H12O6) in 355 grams of water. What is the freezing point depression of the solvent if the freezing point constant is -1.86 °C/m? Show all... more

Chemistry HW: What is the energy value of the olive oil in kJ/g?

When a 0.560 g sample of olive oil is burned in a calorimeter, the heat released increases the temperature of 370 g of water from 22.7C to 39.1C. What is the energy value of the olive oil in... more

You have 5.50L of oxygen gas at a temperature of 21.0°C. What is the volume of the gas at 35°C?

This is a chemistry question i need help with

Which of the following is a buffer system?

A. NaCl and NaNO3   B. H2CO3 and KHCO3   C. HCl and NaOH   D. H2O and HCl   E. NaCl and NaOH

write chemical, complete ionic and net ionic equations for the reaction between CaCl2 and NaCO3

I cannot figure it out, although i think that it has something to do with a double replacement reaction.

how does purity improve accuracy

I need help with this question

A gas at 3.2 atm and 225 K is heated to 273 K. What is the new pressure in atm? (When entering your answer enter only a number; do not enter text or units. Ensu

A gas at 3.2 atm and 225 K is heated to 273 K. What is the new pressure in atm? (When entering your answer enter only a number; do not enter text or units. Ensure your answer conforms to rules... more

How many electrons does Br have

Need help for science homework, having trouble finding It 

what is double-blind tests?

I need help with this question

how does impurities affect filtration and drying of aspirin

I need help with this question

how does the lattice structure cause impurities?

I need help

What physical properties make underground methane storage efficient

What physical properties make underground methane storage efficient? I'm trying to figure out why exactly we store methane underground and there's nothing on this online

How many grams of water would boil if I added 2,552,000 J of energy to a large cauldron of 80.0 °C water?

Please help with this question and how to set it up.

How do you calculate rate of expansion of gas with temperature with a gradient of the line being 0.2?

i am doing a graph plotting in volume and temperature it has asked: How do you calculate rate of expansion of gas with temperature with a gradient of the line being 0.2? 

What mass of ammonia could we make from 100.0 grams each of N2 and H2?

What mass of ammonia could we make from 100.0 grams each of N2 and H2?

I’m doing revision questions and do not know how I would do these gas law questions

2. The inflation of an air bag during a car crash is due to production of nitrogen gas, N2(g), by the following reaction: 2NaN3(s) → 2Na(s) + 3N2(g) a) What volume of N2 is produced when 120 g of... more

I need to calculate the molar extinction coefficient for phycocyanin.

I have a calibration curve, with the equation of the line, and the concentrations of the plotted points, with absorbency plotted against concentration (mg/ml) How do I solve using the Beer Lambert... more

chemistry help

Calculate the emf of the voltaic cell: Concentration of Mg+2 (anode)  is 0.00100 M and Fe+3 (cathode) is 0.100 M   unsure how to find this

how many alkali metals will combine with 1 oxygen family member?

 i don't understand what it asking for?

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