CHEMISTRY HIGH SCHOOL

Baking a cake is an example of -a. forming mixtures.
b. forming solutions.
c. exothermic reactions.
d. endothermic reactions.

Answers

Answer 1
Answer: I think the correct answer is D. Baking a cake is an example of endothermic reaction. The chemical changes happening when you bake a cake includes denaturing proteins in milk, eggs, and flour. Chemical bonds are broken and new bonds are made. To aid these changes, heat is supplied by the heat in an oven.

Related Questions

For the chemical reaction C2H6 + 137 kJ C2H4 + H2, the chemical energy of thea. reactant is greater than the chemical energy of the products. b. products is greater than the chemical energy of the reactant. c. reactant and the chemical energy of the products are equal. d. reaction is conserved.
What type of element is chlorine? metal. alkaline earth metal. halogen. inner transition metal.
A(n) is a chemical substance used to treat, prevent, or diagnose a disease or alter one or more functions of the body.
The chemical formula below shows how salt is produced.HCl + NaOH -----> NaCl + H2O Which substances are the reactants?
Which of the following instruments is used to measure air pressure? A. AnemometerB. ThermometerC. BarometerD. Hygrometer

How many valence electrons are in an atom of phosphorus?a. 2
c. 4
b. 3
d. 5 Please select the best answer from the choices provided A B C D

Answers

How many valence electrons are in an atom of phosphorus?

a. 2
c. 4
b. 3
d. 5 Please select the best answer from the choices provided A B C D

There are five valence electrons are in an atom of phosphorus. The answer is letter D. 

A chemist wants to calculate the amount of heat that is absorbed by a sample of copper as it is melted. Which constant should she use?

Answers

She needs to use the heat of fusion (ΔH(fusion)) and the equation q=mΔH(fusion) or q=nΔH(fusion)  depending on whether or not ΔH(fusion) is given in J/g or J/mol.  The reason why temperature is absent from the equation is that temperature does not change at a phase change, only the enthalpy does.

I hope his helps.  Let me know in the comments if anything is unclear.

Answer:

Hfus

Explanation:

This is correct on edge.

Rainforests are typically responsible for global oxygen turnover

Answers

false...........................................

Answer:

false

Explanation:

The molar heat of fusion of gold is 12.550 kJ mol–1. At its melting point, how much mass of melted gold must solidify to release 235.0 kJ of energy?

Answers

The total heat released, Q, equals number of moles, n, times molar heat of fussion, Hf. this is: Q = n * Hf. You kno Q and Hf, so you can find n as n = Q/Hf = 235.0 kJ / 12.55 kJ/mol = 18.72 mol. Now you can pass that to mass using the atomic mass of Au, which is 197 g/mol => mass = 18.73 mol * 197 g/mol = 3688.9 grams.

Answer:

the answer is d.

Explanation:

Excuse me while I go kill Thanos.

Hydrazine, N2H4, and hydrogen, H2O2, have been used as rocket propellants. They react according to the equation: H2O2 + N2H4 → N2 + H2O

a. How many moles of N2 are formed from 0.0250 moles of N2H4? (0.0250)

b. How many moles of H2O2 are required if 1.35 moles of H2O is to be produced? (0.675)

c. How many moles of H2O are formed if 1.87 moles of N2 is produced? (7.48)

Answers

Explanation:

The equation of the reaction is;

H2O2 + N2H4 → N2 + H2O

Upon balancing the reaction, we have;

N2H4 + 2H2O2 → N2 + 4H2O  

a. How many moles of N2 are formed from 0.0250 moles of N2H4?

From the equation of the reaction;

1 mol of N2H4 produces 1 mol of N2

0.0250 mol of N2H4 would produce x mol of N2

1 = 1

0.0250 = x

x = 0.0250 * 1 / 1 = 0.0250 mol

b. How many moles of H2O2 are required if 1.35 moles of H2O is to be produced?

From the equation of the reaction;

2 mol of H2O2 produces 4 mol of H2O

x mol of H2O2 produces 1.35 mol of H2O

2 = 4

x = 1.35

x = 1.35 * 2 / 4 = 0.675 mol

c. How many moles of H2O are formed if 1.87 moles of N2 is produced?

The relationship between H2O produced and N2 is;

For every 1 mol of N2 produced, 4 mol of H2O is produced

1.87 mol of N2 produced, how many moles of H2O is produced?

1 = 4

1.87 = x

x = 1.87 * 4 / 1 = 7.48 mol

the radioisotope radon-222 has a half-life of 3.8 days. How much of a 73.9-gram sample of radon-222 would be left after approximately 23 days?

Answers

There will be 1.11 grams of the sample of radon-222 left. This answer can be obtained using the formula of half life to get the rate constant which will be used in another equation later on.

Half-life (t) = ln2/k = 3.8 days

k = 0.182407/day

Using the general equation of a first order reaction:

Ca/Cao = 1/e^(kt)
Ca/Cao = 0.01506 --> fraction of radon-222 left

This means that 1.51% of the original amount remains, so 1.51% of 73.9 is 1.11 grams.
Other Questions
What would happen if u washed the benzoic acid in the Büchner funnel with hot solvent ? answer ASAP
Aluminum metal reacts with aqueous iron(II) chloride to form aqueous aluminum chloride and iron metal. What is the stoichiometric coefficient for aluminum when the chemical equation is balanced using the lowest, whole-number stoichiometric coefficients? Aluminum metal reacts with aqueous iron(II) chloride to form aqueous aluminum chloride and iron metal. What is the stoichiometric coefficient for aluminum when the chemical equation is balanced using the lowest, whole-number stoichiometric coefficients? 3. 1. 4. 2.
Which of the following represents an ion?a 4heb Na 2+c Cad Mg
Which reaction occurs spontaneously?(1) Cl2(g) + 2NaBr(aq)-->Br2(l) + 2NaCl(aq) (2) Cl2(g) + 2NaF(aq)--> F2(g) + 2NaCl(aq) (3) I2(s) + 2NaBr(aq)--> Br2(l) + 2NaI(aq) (4) I2(s) + 2NaF(aq)--> F2(g) + 2NaI(aq)