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3 years ago

Which statement about silver Ag metal is least reliable

Chemistry

2 answers:

zheka24 [161]3 years ago

8 0

The choices fro above statement are given below:

Silver metal may be useful in medicine in the future.

Silver atoms commonly form ions with a +1 charge.

Silver is a transition metal with electrons in the d shell.

Silver atoms have 47 protons in their nuclei.

The correct answer is:

Silver metal may be useful in medicine in the future.

Explanation:

Silver is a chemical element with representation Ag and atomic number 47. A smooth, white, lustrous transition metal, it displays the necessary electrical conductivity, thermal conductivity, and reflectivity of either metal.

Anna007 [38]3 years ago

3 0

The choices for this question can be found elsewhere and as follows:

Silver is a transition metal with electrons in the d shell.
Silver atoms have 47 protons in their nuclei.
Silver atoms commonly form ions with a +1 charge.

I think the correct answer is the last option. The least reliable information would be that silver atoms commonly form ions with a +1 charge.

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lbvjy [14]

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3 years ago

Why does a tadpole reabsorb its tail into its body?

adelina 88 [10]

Answer:

The cells mutated.

Explanation:

Lysosomes is the cell that digest the unwanted materials in the cytoplasm.

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3 years ago

Read 2 more answers

Methanol, ethanol, and n−propanol are three common alcohols. When 1.00 g of each of these alcohols is burned in air, heat is lib

KengaRu [80]

Answer:

For methanol: Heat of combustion = -22.6 kJ / 0.0312 moles = -724.3590 kJ/mol (negative sign signifies release of heat)

For ethanol: Heat of combustion = -29.7 kJ / 0.0217 moles = -1368.6636 kJ/mol (negative sign signifies release of heat)

For propanol: Heat of combustion = -33.4 kJ / 0.0166 moles = -2012.0482 kJ/mol (negative sign signifies release of heat)

Explanation:

Given:

Mass of Methanol = 1.0 g

Mass of ethanol = 1.00 g

Mass of n-propanol = 1.00 g

For methanol:

2 CH₃OH + 3 O₂ ----> 2 CO₂ + 4 H₂O, ∆H₀ = -22.6 kJ/g (negative sign signifies release of heat)

1 g of methanol on combustion gives 22.6 kJ of energy

Calculation of moles of methanol:

$moles=\frac{Mass(m)}{Molar\ mass (M)}$

Molar mass of methanol = 32.04 g/mol

Thus moles of methanol = 1 g/ (32.04 g/mol) = 0.0312 moles

Hence energy in kJ/mol:

Heat of combustion = -22.6 kJ / 0.0312 moles = -724.3590 kJ/mol (negative sign signifies release of heat)

For ethanol:

C₂H₅OH + 3 O₂ ----> 2 CO₂ + 3 H₂O, ∆H₀ = -29.7 kJ/g (negative sign signifies release of heat)

1 g of ethanol on combustion gives 29.7 kJ of energy

Calculation of moles of ethanol:

$moles=\frac{Mass(m)}{Molar\ mass (M)}$

Molar mass of ethanol = 46.07 g/mol

Thus moles of ethanol = 1 g/ (46.07 g/mol) = 0.0217 moles

Hence energy in kJ/mol:

Heat of combustion = -29.7 kJ / 0.0217 moles = -1368.6636 kJ/mol (negative sign signifies release of heat)

For propanol:

2 C₃H₇OH + 9 O₂ ----> 6 CO₂ + 8 H₂O, ∆H₀ = -33.4 kJ/g , (negative sign signifies release of heat)

1 g of methanol on combustion gives 33.4 kJ of energy

Calculation of moles of methanol:

$moles=\frac{Mass(m)}{Molar\ mass (M)}$

Molar mass of methanol = 60.09 g/mol

Thus moles of methanol = 1 g/ (60.09 g/mol) = 0.0166 moles

Hence energy in kJ/mol:

Heat of combustion = -33.4 kJ / 0.0166 moles = -2012.0482 kJ/mol (negative sign signifies release of heat)

5 0

3 years ago

The first step in the reaction of Alka–Seltzer with stomach acid consists of one mole of sodium bicarbonate (NaHCO3) reacting wi

Gnesinka [82]

Answer: 5 moles of $H_2CO_3$ can be produced from 5 mol NaHCO3 and 9 mol HCl.

Explanation:

The balanced chemical reaction is:

$NaHCO_3+HCl\rightarrow H_2CO_3+NaCl$

According to stoichiometry :

1 mole of $NaHCO_3$ use 1 mole of $HCl$

Thus 5 moles of $NaHCO_3$ use= $\frac{1}{1}\times 5=5moles$ of $HCl$

Thus $NaHCO_3$ is the limiting reagent as it limits the formation of product and $HCl$ is the excess reagent.

As 1 mole of $NaHCO_3$ give = 1 mole of $H_2CO_3$

Thus 5 moles of $NaHCO_3$ give = $\frac{1}{1}\times 5=5moles$ of $H_2CO_3$

5 moles of $H_2CO_3$ can be produced from 5 mol $NaHCO_3$ and 9 mol HCl.

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3 years ago

Fruits are the characteristics of ___

sukhopar [10]

C. Angiosperms (flowering plants)

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3 years ago