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Ivan
3 years ago
6

Arrange the following atoms in order of decreasing atomic radius

Chemistry
1 answer:
ElenaW [278]3 years ago
6 0

Answer:

li

be

na

si

s

............. ..

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The enthalpy change for converting 1.00 mol of ice at -25.0 °c to water at 70.0 °c is __________ kj. the specific heats of ice
Margarita [4]
Answer is: 6,16 kJ.
1) changing  temperature of ice from -25°C to 0°C.
Q₁ = m·C·ΔT
Q₁ = 18 g · 2 J/g·°C · 25°C 
Q₁ = 900 J.
m(H₂O) = 1mol · 18 g/mol = 18 g.
C - <span>specific heat of ice.
</span>2) changing temperature of water from 0°C to 70°C.
Q₁ = m·C·ΔT
Q₁ = 18 g · 4,18 J/g·°C · 70°C 
Q₁ = 5266,8 J.
C - specific heat of water.
Q = Q₁ + Q₂ = 900 J + 5266,8 J
Q = 6166,8 J = 6,16 kJ.

8 0
3 years ago
Is breaking a pretzel physical change or chemical change
e-lub [12.9K]
It is a physical change because it is still the same thing (a pretzel) but just in two pieces. You’re not changing chemical composition.
8 0
4 years ago
Read 2 more answers
#3 of thermo terms
Evgesh-ka [11]

Answer:

C

Explanation:

If the enthalpy change (i.e. Δ<em>H</em>) of a reaction is negative, then the reaction releases heat and is hence exothermic.

Hence, our answer is C.

Conversely, if Δ<em>H</em> is positive, the reaction absorbs heat and is endothermic.

Δ<em>H</em> tells us nothing about the speed of the reaction.

While Δ<em>H</em> influences free-energy change (Δ<em>G</em> = Δ<em>H</em> - <em>T</em>Δ<em>S</em>), we cannot predict the sign of Δ<em>G</em> given only Δ<em>H </em>(recall that a reaction is spontaneous if Δ<em>G</em> < 0).

4 0
3 years ago
If you have 3.62 moles of Tin (Sn), how many grams do you have?
lyudmila [28]

Answer:

Use molar mass:)

Explanation:

3.62 mol of Sn (\frac{118.7gramsSn}{mol})=429.694

Since 3.62 has 3 sig figs, limit 429.694 to 3

= 430

5 0
3 years ago
(20 Points) Which definition of "coarse" matches its use in the phrase "coarse focus?"
vlada-n [284]

Answer by YourHope:


Hi! :)


Which definition of "coarse" matches its use in the phrase "coarse focus?"


A) "rough in texture"


Have a BEAUTIFUL day~

7 0
3 years ago
Read 2 more answers
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