After burning for three hours, a candle has lost half of its mad. Explain why this example does not violate the law of conversation of mass.

Answers

Answer 1
Answer:

The law of mass conservation depicts that the mass of reactants is equal to the mass of products, so the mass of the candle is changed from solid state  to gaseous state which have the same mass of the wasted candle.

What is the law of conversation of mass ?

According to the law of conservation of mass, it has been described that the mass neither formed nor destroyed, it can only transferred from one state to another state.

Due to changes in states of matter, the mass is only rearranged and changed, so during a chemical reaction, the mass of the reactants and the products are same in a closed reaction.

There for when burning the candle it only changes its state from solid to gaseous state that follow the law of conservation of mass.

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Answer 2
Answer:


well from my teacher when we did this experiment  she said that I would most likely will violate it unless its covered up!

I really hope I helped thx!


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The pH of a solution decreases by 2.0. How does the hydronium ion concentration of the solution change? increases to 2 times the original concentration
increases to 100 times the original concentration
decreases to 1/100 of the original concentration
decreases to 1/2 of the original concentration

Answers

Answer: The correct answer is 'increases to 100 times the original concentration'.

Explanation:

let the initial pH be x

The original concentration of [H^+] initially present be y

x=-log[y]...(1)

Final concentration of [H^+] when pH reduced by 2 be z

x-2=-log[z]...(2)

Putting the value of 'x' from (1) into (2) we get :

-log[y]-2=-log[z]

z=10^2y=100y

When pH of a solution decreases by 2.0, hydronium ion concentration of the solution increases to 100 times the original concentration



Answer:

B, is the answer

What organisms appeared on Earth First?a). gastropods
b). horn corals
c). brachiopods
d). crinoids

Answers

it is B because horn coals are bigger and I read it in a book

All funguslike protists are able to do this at some point in their lives

Answers

Protists belong to the group eukaryotes (having their DNA enclosed inside the nucleus). They are not plants, animals or fungi but they act like one. They can be in general subgroups such as unicellular algae, protozoa and molds. 

How many molecules are there in 5.0g of C2H5OH?

Answers

About 6.5x10^22 molecules.(5g C2H5OH)x(1 mol C2H5OH/46g C2H5OH)x(6.02x10^23 molecules C2H5OH/1 mol C2H5OH)=(3.01E24)/46=6.5x10^22.Let me know if this helped!

CHEMISTRYWhich of the following properties of an element is least likely to change with beta decay?

A. the mass number
B. the period number
C. the atomic number
D. the name of the element

When a nucleus has too many protons, it can absorb an electron and create _________.

A. a proton
B. a neutron
C. an electron
D. an alpha ray

Which of the following occurs in beta decay?

A. A neutron of an atom emits a high energy proton.
B. A neutron of an atom emits a high energy electron.
C. An electron of an atom emits a high energy proton.
D. A neutron of an atom emits a second high energy neutron.

What kind of ray is given off after electron capture?

A. a beta ray
B. a delta ray
C. an alpha ray
D. a gamma ray

Answers

number 1.c
number 2.a
number 3.b
number 4.d

Answer:

Which of the following occurs in beta decay?

Answer: A neutron of an atom emits a high energy electron.

Explanation:

Via Educere/ Founder's Education

Which of the following would most likely be the characteristics of a desert?O Freezing temperatures and location in higher latitudes
O High temperatures and location in high latitudes
O Moderate temperatures and location in mid to high latitudes
O Warmer temperatures and location around the equator

Answers

Answer: D

Explanation:

Answer: High temperatures and location in high latitudes

Explanation: