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Lostsunrise [7]

3 years ago

5

In a chemical reaction, one or more substances called are combined or broken down to form _. products; reac

tants products; compounds reactants; products reactants; elements

1 answer:

Eddi Din [679]3 years ago

7 0

The correct response should be reactants;products

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I need help can someone please do so?

larisa86 [58]

Answer:

0.296 J/g°C

Explanation:

Step 1:

Data obtained from the question.

Mass (M) =35g

Heat Absorbed (Q) = 1606 J

Initial temperature (T1) = 10°C

Final temperature (T2) = 165°C

Change in temperature (ΔT) = T2 – T1 = 165°C – 10°C = 155°C

Specific heat capacity (C) =..?

Step 2:

Determination of the specific heat capacity of iron.

Q = MCΔT

C = Q/MΔT

C = 1606 / (35 x 155)

C = 0.296 J/g°C

Therefore, the specific heat capacity of iron is 0.296 J/g°C

8 0

3 years ago

What is the change in enthalpy when 4.00 mol of sulfur trioxide decomposes to sulfur dioxide and oxygen gas? 250 2(g) + O2(g) ®

lidiya [134]

Answer: A. -396 kJ

Explanation:

The standard enthalpy of formation or standard heat of formation of a compound is the change of enthalpy during the formation of 1 mole of the substance from its constituent elements, with all substances in their standard states.

$2SO_2(g)+O_2 (g)\rightarrow 2SO_3(g)$ $\Delta H^0=198kJ$

Reversing the reaction, changes the sign of $\Delta H$

$2SO_3(g)\rightarrow 2SO_2(g)+O_2 (g)$ $\Delta H^0=-198kJ$

On multiplying the reaction by 2, enthalpy gets multiplied by 2:

$4SO_3(g)\rightarrow 4SO_2(g)+2O_2 (g)$ $\Delta H=2\times -198kJ=-396kJ$

Thus the enthalpy change for the reaction $4SO_3(g)\rightarrow 4SO_2(g)+2O_2 (g)$ is -396 kJ.

8 0

3 years ago

An object has 15 grams of atoms and displaces 2.5 mL of water when dropped into a cylinder. What is the objects density?

Softa [21]

Answer:

<h3>The answer is 6 g/mL</h3>

Explanation:

The density of a substance can be found by using the formula

$density = \frac{mass}{volume} \\$

From the question

mass = 15 g

volume = 2.5 mL

We have

$density = \frac{15}{2.5} \\$

We have the final answer as

<h3>6 g/mL</h3>

Hope this helps you

7 0

3 years ago

1. How did Mosely contribute to the periodic table arrangement?

KIM [24]

Answer:

1. Mosely arranged the elements based on the increasing number of protons, atomic number.

2. According to Moseley, similar properties recur periodically when elements are arranged according to increasing atomic number. Atomic numbers, not weights, determine the factor of chemical properties. Mendeleev ordered his elements in order of their relative atomic mass, and this gave him some problems.

Explanation:

4 0

3 years ago

Based on molecular orbital theory, the only molecule in the list below that has unpaired electrons is __________.a) C2b) N2c) F2

Len [333]

Answer:

B.

Explanation:

ive done this before trust

4 0

2 years ago