CHEMISTRY MIDDLE SCHOOL

What is the mass in grams of 16.3 mol of the element
nickel, Ni?

Answers

Answer 1
Answer:

Answer:

The mass of 16.3 moles of nickel is 956. 647 g.

Explanation:

Given data:

moles of nickel = 16.3 mol

molar mass of nickel = 58.69 g/mol

mass in gram = ?

solution:

Formula:

number of moles = mass / molar mass

mass = number of moles × molar mass

mass = 16.3 mol × 58.69 g/mol

mass= 956. 647 g


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HIGH SCHOOL

Coordination chemistry of the carboxylate type siderophore rhizoferrin: the iron(iii) complex and its metal analogs

Answers

solution;

Rhizoferrin is a member of a new class of siderophores (microbial iron transport compounds) based on carboxylate and hydroxy donor groups rather than the commonly encountered hydroxamates and catecholates. We have studied the coordination chemistry of rhizoferrin (Rf), as a representative of this group, with Fe(3+), Rh(3+), Cr(3+), Al(3+), Ga(3+), VO(2+), and Cu(2+). The metal complexes have been studied by UV-vis, CD, NMR, and EPR spectroscopies and mass spectrometry. The formation constants for the iron complex have also been measured and yield a log K(LFe) of 25.3. The Rh and Cr rhizoferrin complexes are unusual in that they appear to adopt a chirality about the metal center that is the opposite of the native iron analog. Several of the alternative metal ion complexes are found to have biological activity toward Morganella morganii in a plate type assay.

COLLEGE

How many carbon atoms are in a diamond (pure carbon) with a mass of 30 mg ? Express your answer using two significant figures.

Answers

Answer:

1.50×10²¹ atoms of C

Explanation:

First of all, let's convert the mass into moles (mass (g) / molar mass)

0.030 g / 12 g/mol = 2.5×10⁻³ moles

Now, we can apply the Avogadro Number

1 mol has __ 6.02×10²³ atoms

2.5×10⁻³ mol would have (2.5×10⁻³ mol . NA) = 1.50×10²¹

Answer: There are atoms of carbon

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number of particles.

To calculate the moles, we use the equation:

        (1g=1000mg)

1 mole of carbon atom contains = atoms of carbon

0.0025 mole of carbon contain = atoms of carbon

There are atoms of carbon

HIGH SCHOOL

A change from one state of matter to another involves the transfer of a. heat.
b. atoms.
c. phases.
d. density.

Answers

Answer: Option (a) is the correct answer.

Explanation:

Change in state of a substance occurs due to change in position of atoms by absorption or release of heat energy.

For example, ice is the solid state of water and when we keep it at room temperature then it absorbs heat from its surroundings. As a result, intermolecular forces of attraction between its molecules weaken.

Due to this particles or atoms gain kinetic energy and they tend to move away from each other.

Thus, we can conclude that a change from one state of matter to another involves the transfer of heat.

A heat because heat is the transfer of energy.
HIGH SCHOOL

When two different liquid chemical compounds at room temperature are mixed together, the beaker they are poured into is icy to the touch. What kind of reaction is this an example of? A. a fission reaction B. a combustion reaction C. an exothermic reaction D. an endothermic reaction

Answers

Answer: option D. an endothermic reaction

Explanation: since the reaction vessel is icy to touch, it means the system gains heat as the surroundings cool down. This is clearly an endothermic reaction.

Exothermic reaction
loss of heat
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