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Maurinko [17]
3 years ago
15

PLEASE HELP I BEG YOU I REALY NEED HELP

Chemistry
2 answers:
Korvikt [17]3 years ago
5 0

Answer: 1. Physical change

2. volume

3. true

Explanation:

padilas [110]3 years ago
3 0

Answer: 1

Explanation:

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The specific gravity of water is 1.0. True False
Zielflug [23.3K]
The specific gravity of water is 1.0 True 
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When copper is bombarded with high-energy electrons, X rays are emitted. Calculate the energy (in joules) associated with the ph
Scrat [10]

Answer:

E = 12.92 × 10^(-16) J

Explanation:

Formula for energy is;

E = hc/λ

Where;

h is Planck's constant = 6.63 x 10^(-34) J.s

c is speed of light = 3 × 10^(8) m/s

λ is wavelength = 0.154 nm = 0.154 × 10^(-9) m

E = (6.63 x 10^(-34) × 3 × 10^(8))/(0.154 × 10^(-9))

E = 12.92 × 10^(-16) J

6 0
3 years ago
Balance the equation and show the calculation of the number of moles and grams of CO2 formed from 11.9 grams of O2. Show your an
n200080 [17]

Answer:

0.2349 moles, 10.3356 g

Explanation:

The given reaction is :

C_6H_{14}+O_2\rightarrow CO_2 + H_2O

The balanced reaction by equating the same number of each atom both side is :

2C_6H_{14}+19O_2\rightarrow 12CO_2 + 14H_2O

Given that :

Amount of oxygen gas = 11.9 g

Molar mass of oxygen gas = 32 g/mol

The formula for the calculation of moles is shown below:

moles = \frac{Mass\ taken}{Molar\ mass}

Thus, moles are:

moles= \frac{11.9\ g}{32\ g/mol}

moles= 0.3719\ mol

From the reaction,  

19 moles of oxygen gas on reaction forms 12 moles of carbon dioxide

Also,

1 mole of oxygen gas on reaction forms 12/19 moles of carbon dioxide

So,

0.3719 moles of zinc on reaction forms \frac {12}{19}\times 0.3719 mole of carbon dioxide

<u>Moles of carbon dioxide formed = 0.2349 moles</u>

Mass of carbon dioxide = moles×Molar mass

Molar mass of carbon dioxide = 44 g/mol

<u>Mass of carbon dioxide formed = 0.2349 ×44 g = 10.3356 g</u>

4 0
3 years ago
What is the relationship between temperature and volume?
Lelu [443]

Answer:

Charles's law states that the volume of a given amount of gas is directly proportional to its temperature on the kelvin scale when the pressure is held constant

The volume of a given gas sample is directly proportional to its absolute temperature at constant pressure (Charles's law). The volume of a given amount of gas is inversely proportional to its pressure when temperature is held constant (Boyle's law)

Explanation:

~Hope this helps

6 0
3 years ago
Nucleus Nucleus Atom 1 Atorn 2 Nucleus Nucleus Atom 3 Atom 4 Which two atoms are of elements in the same group in the periodic t
saul85 [17]

Explanation:

The atoms of elements on the same period on the periodic table typically have the same number of valence electrons.

They have the same electronic configuration.

Valence electrons are electrons in the outermost shell of an atom.

The number of electrons in an atom is a good indicator of elements that might potentially belong to the same group.

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3 years ago
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