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laila [671]
3 years ago
15

Which of the following will stay constant, no matter if the substance is in the solid, liquid, or gas state?

Chemistry
1 answer:
Hoochie [10]3 years ago
5 0

Answer: Mass will Always stay constant.

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Which pairs would form covalent bonds?
vladimir1956 [14]

A) H and Cl

E) C and O

6 0
3 years ago
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An aqueous solution containing 17.5 g of an unknown molecular compound in 100.g water was found to have a freezing point of-1.8°
Zigmanuir [339]

Answer:

The answer to your question is 178.6 g

Explanation:

Data

ΔT = 1.8 °C

mass = 17.5 g

mass of water = 100 g

Kc = 1.86

Process

1.- Calculate the molality using the following formula

    ΔTc = mKc

solve for m

    m = ΔTc/Kc

substitution

     m = 1.8/1.86

result

     m = 0.968

2.- Calculate the number of moles

    m = # of moles/kg of solvent

kg of solvent = 0.1 kg

     # of moles = m x kg of solvent

     # of moles = 0.968 x 0.1

     # of moles = 0.0968

3.- Calculate the molar mass

        x g molar mass --------------------- 1 mol

       17.5 g                  --------------------- 0.0968 moles

       x = (1 x 17.5)/0.0968

      x = 178.6 g

             

4 0
3 years ago
#1: Which of the following statements is true?
liberstina [14]
<span>Endothermic reactions take in heat from the environment in order to react while exothermic reactions release heat during the reaction. For this, D must be true as the products have less energy because they have released heat during the reaction. A and C are incorrect because they products and reactants are equal and B is wrong because the energy of the products would be more as the reaction took in heat.</span>
6 0
4 years ago
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Find A, B, and C
Lynna [10]
Electrons = protons
protons = atomic number
protons + neutrons = atomic mass

Therefore: a) protons + 7 = 15
                        protons= 15 -7
                        protons= 8

B) Remember proton = atomic number
     so atomic number = 8

C)Now we know the atomic number so we can easily check on the periodic table what element has an atomic number of 8, which is Oxygen
8 0
3 years ago
Increasing temperature can
SOVA2 [1]
A- Change the phase of the matter
7 0
4 years ago
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