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umka21 [38]
3 years ago
13

Using distributive property solve 9×19​

Chemistry
2 answers:
Serga [27]3 years ago
8 0

Answer:

9*(10+9)

(90+81)

(171) is the answer

Marianna [84]3 years ago
6 0
The answer is for this question is 171
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Assuming constant pressure and temperature, how many moles of gas have been added to the initial 3 moles of gas when the volume
Temka [501]
We first assume that the gas is ideal which is a safe assumption to approximate the answer to the problem. Then we need to know the ideal gas equation and that is:
 
PV=nRT 
where 
P- pressure
V- volume
n-number of moles-
R- ideal gas constant 
T-temperature. 

Since we know that P, T and V are constant, rearranging the equation would lead to:

P/TR = n/V or the ratio of the moles of gas and volume is constant. 

(3moles)/2L = (3+x)/4L 
where 
x is the additional moles. 

Solving for x = 3 moles. 
8 0
4 years ago
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The _______ of an atom are negatively charged. a. protons b. negatrons c. neutrons d. electrons
PIT_PIT [208]
Protons = +1
negatrons = -1
neutrons = 0
<span>electrons = -1
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<span>negatrons are like positrons and they are subatomic particles and are not present in atoms 
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so electrons are negatively charged and are present in atoms 

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7 0
3 years ago
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Which of the following isotopes would most likely be unstable and therefore radioactive?
svlad2 [7]

Answer: Mercury-194 is an unstable isotope and hence is radioactive.

Explanation: Mercury-194 is an isotope of mercury, having formula _{80}^{194}\textrm{Hg}

Number of protons in this isotope = 80

Number of neutrons in this isotope = 114

This isotope is radioactive in nature and under decay process by Electron Capture.

Electron capture reactions are the reactions in which a proton in a nucleus absorbs an electron and convert it into neutron. The resulting nucleus will have a decreased atomic number and same atomic mass.

Reaction for electron capture of mercury-194 follows:

_{80}^{194}\textrm{Hg}+_{-1}^0\textrm{e}\rightarrow _{79}^{194}\textrm{Au}

6 0
3 years ago
What stored information in a cell?
Ede4ka [16]

that would have to be nucleus

4 0
4 years ago
In salt, what is the nature of the bond between sodium and chlorine? in salt, what is the nature of the bond between sodium and
kifflom [539]

A chemical bond that involves the transfer of electrons from a metal to a nonmetal and thus forms ions and the atoms in the molecule are attracted towards each other through electrostatic force of attraction are said be ionic bond. In short, the bond formed between the two oppositely charged ions.

In salt, the compound formed between sodium and chlorine is sodium chloride having molecular formula NaCl where sodium is a metal and chlorine is the non-metal. The formation of the compound takes place by transfer of an electron from sodium thus forming a cation of formula Na^{+} to chlorine which gains electron and thus results in an anion formation having formula Cl^{-}. The force of attraction between these oppositely charged ions that helds them together and results in formation of NaCl compound is electrostatic force of attraction.

Hence in salt, the nature of bond between sodium and chlorine is ionic.

4 0
4 years ago
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