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3 years ago

What do scientist use to measure the volume of a substance

Chemistry

2 answers:

jekas [21]3 years ago

7 0

Scientist use density to measure how much stuff is in a specified volume of a substance

natali 33 [55]3 years ago

3 0

Scientists use a Graduated Cylinder

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The student is now told that the four solids, in no particular order, are calcium bromide (CaBr2), sugar (C6H12O6), benzoic acid

nataly862011 [7]

<h2>Answer : The order of conductivity from most conductive to least is this - </h2><h2>Calcium bromide $(CaBr_{2})$ , Potsassium bromide (KBr), Benzoic acid $C_{6}H_{5}COOH$ and last is sugar.</h2><h3>Explanation : </h3>

When dissolved in water $(CaBr_{2})$ produces three ions namely; $Ca^{+2}$ and $2Br^{-}$ which acts as best conductor amongst the given choices.

Next is potassium bromide when dissolved in water generates only two ions which are $K^{+}$ and $Br^{-}$ and acts as an conductor.

Benzoic acid $C_{6}H_{5}COOH$ , is a weak acid and is slightly ionized so it acts as an weak conductor.

Sugar is a non ionized compound so it is anon conductor.

3 0

3 years ago

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Nitric oxide (NO) can be formed from nitrogen, hydrogen and oxygen in two steps. In the first step, nitrogen and hydrogen react

tatiyna

Answer:

ΔH = - 272.255 kJ

Explanation:

Given that

In first step ,reaction is given as

N2(g) + 3H2(g) →2NH3(g) ΔH=−92 kJ

In second step ,reaction is given as

4NH3(g) + 5O2(g) → 4NO(g) +6H2O(g) ΔH=−905 kJ

Now multiple by in the first equation ,we get

2N2(g) + 6H2(g) →4NH3(g) ΔH=− 184 kJ

Now by adding the above equation

2N2(g) + 6H2(g) →4NH3(g) ΔH=− 184 kJ

2 N2+6 H2 + 5 O2 → 4 NO + 6 H2O ΔH= - 1089 k J

For one mole of nitric oxide (NO)

$\Delta H=\dfrac{-1089}{4}= -272.255\ kJ$

ΔH = - 272.255 kJ

Therefore change in the enthalpy will be - 272.255 kJ.

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3 years ago

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Where are the electrons inside an atom?

Nataly [62]

Answer: B.They are arranged in energy levels

Explanation: Electrons orbit around the nucleus of an atom, and are not spread around equally throughout an atom because there are a different amount of electrons that can fit in each energy level or electron shell (both are the same thing). For example the first energy level can hold up to 2 electrons, the second shell can hold up to 8 electrons, the third can hold up to 18, and so on represented by the equation 2(n^2)

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3 years ago

Is lemon juice or orange juice more acidic? Please explain.

Marysya12 [62]

<span>Lemon juice has more acid because of its density and it contains more sodium.</span>

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3 years ago

Which of these changes do not involve forming or breaking chemical bonds?

gregori [183]

D
Boiling and melting are both physical changes so do not involve the formation or breakage of chemical bonds.

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3 years ago

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