CHEMISTRY COLLEGE

The specific heat capacity of liquid water is 4.18 J/g-K. How many joules of heat are needed to raise the temperature of 5.00 g of water from 25.1°C to 65.3°C?

Answers

Answer 1

Answer:

Answer:

840.18

Explanation:

Use the equation: Q = mcΔT

m = mass (5 g)

c = specific heat (4.18)

ΔT = change in temperature (65.3-25.1 = 40.2)

$5*4.18*40.2$ = 840.12

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Which of the following statements best explains why the atomic radius increases from top to bottom of the periodic table? A. The electronegativity decreases from top to bottom of the periodic table, so the atoms near the bottom have an increased capacity for electrons. B. For the atoms lower in the periodic table, there is more difference in charge between the electrons and the protons, which allows electrons to orbit farther from nucleus. C. The ionization energy decreases from top to bottom of the periodic table, so the atoms near the bottom have an increased capacity for electrons. D. For the atoms lower in the periodic table, the valence electrons are in higher energy levels and farther from the nucleus.

Answers

Answer:

D. For the atoms lower in the periodic table, the valence electrons are in higher energy levels and farther from the nucleus.

Explanation:

Atomic radius increases down the group because down the group, there an increase in the number of principle energy levels occupied. Now, these higher principal energy levels are made up of orbitals that are larger than the orbitals from the lower energy levels in size.

Therefore, the effect of this is that the greater number of principal energy levels will outweigh the increase in nuclear charge since nuclear charge also increases down the group and this in turn makes the atomic radius to increase as we go down the group.

Answer: C. For the atoms lower in the periodic table, the balance electrons are in higher energy levels and farther from the nucleus.

Explanation: As the valance electrons orbit farther from the nucleus the energy level increases from the top to the bottom of the periodic table. So the atoms lower in the periodic table, the balance electrons are in higher energy levels and farther from the nucleus, which result in an increase in the atomic radius.

Consider the titration of 25.0 mL of 0.340 M HCl with 0.160 M NaOH. What volume of NaOH is required to reach the equivalence point?

Answers

Answer:

53.1 mL NaOH

Explanation:

Draw a well-labelled diagram showing how your body digests food

Answers

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Explanation:

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How many sulfide ions are in 15 dg of sodium sulfide?O 1.16 x 1022
O 3.04 x 1028
O 5.76 x 1029
O 6.02 x 1023
O 3.13

Answers

There are 5.78 × 10^20 sulfide ions in sodium sulfide

The formula of the compound is Na2S. The molar mass of the compound is calculated as follows; 2(23) +32 = 46 + 32 = 78 g/mol

Number of moles of Na2S = 0.15 g/ 78 g/mol = 0.0019 moles

Since there is 1 mole of Na^+ and 2 moles of S^2- in Na2S, the number of S^2- ions in 0.19 moles of Na2S is 0.00096 moles of S^2-.

If 1 mole of S^2- contains 6.02 × 10^23

0.095 moles of S^2- contains 0.00096 moles × 6.02 × 10^23/ 1 mole

= 5.78 × 10^20 sulfide ions

Learn more: brainly.com/question/1309057

Consider the balanced equation for the following reaction:7O2(g) + 2C2H6(g) → 4CO2(g) + 6H2O(l)
Determine the amount of CO2(g) formed in the reaction if 8.00 grams of O2(g) reacts with an excess of C2H6(g) and the percent yield of CO2(g) is 90.0%.