CHEMISTRY HIGH SCHOOL

To find the atomic mass of a particular atom you need to knowa. the number of protons.
b. the number of neutrons.
c. the number of protons and neutrons.
d. simply what element the atom belongs to.

Answers

Answer 1

Answer: You just need the number of protons and number of neutrons as the mass of eelctrons is negligible

Answer 2

Answer:

Answer:

C. the number of protons and neutrons

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when 200 grams of water cools from 50 c to 25 c the total amount of heat energy released by the water is?

Answers

Answer : The heat released by the eater is, $2.1* 10^4J$ [/tex]

Explanation :

Formula used :

$Q=m* c* \Delta T$

or,

$Q=m* c* (T_2-T_1)$

where,

Q = heat released = ?

m = mass of water = 200 g

c = specific heat of water = $4.184J/g^oC$

$T_1$ = initial temperature = $50^oC$

$T_2$ = final temperature = $25^oC$

Now put all the given value in the above formula, we get:

$Q=200g* 4.184J/g^oC* (25-50)^oC$

$Q=20920J=2.1* 10^4J$ [/tex]

Therefore, the heat released by the eater is, $2.1* 10^4J$ [/tex]

Specific Heat:
Heat Energy= Mass of substance X Specific Heat X Change in Temp.
1. change in temp |50-25| = 25
2. specific heat of Water(H2O) = cal/g (Celsius) 1.000
heat energy= 200g X 1.000 X 25
Heat energy = 5000cal

How does the number of protons compare to the number ofelectrons in an anion?
a There are more electrons than protons.
b There are more protons than electrons.
c
There is no consistent relationship between the
numbers of protons and electrons.
d There are equal numbers of protons and electrons.

Answers

It is A).
Electrons are negatively charged and an anion is a negatively charged ion so that means there is more electrons(negative charge) than protons(positive charge) in an anion

Answer:B is the right answer

Explanation:

Which of the following gases are typically used for colorful lighting when an electric current is applied?A) hydrogen and helium
B) argon and krypton
C) fluorine and chlorine
D) oxygen and nitrogen

Answers

B) Argon and Krypton
The unreactive nature of noble gases allows them to be applied in such places without the risk of poisonous leaks or other disasters.

B)Argon and Krypton is applied for that..........

Do x-rays travel slower than infrared

Answers

No, x-rays do not travel slower than infrared radiation or even the opposite. Both are travelling in vacuum therefore they travel at same speed. They differ in the frequency of the electromagnetic waves.

Chemicals secreted by glands which regulate tissues or organs are called______

Answers

Chemicals secreted by glands which regulate tissues or organs are called hormones. Endocrine glands are responsible for regulating body activities. Endocrine glands release chemicals that are called hormones which help the body to function properly. the endocrine system regulate many internal processes.

Answer:

Hormones

hope i helped!

Which organic compound is most soluble in water? A) ethyne B) benzene C) butane D) ethanol