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2 years ago

1. Lead (Pb), silver (Ag), and iron (Fe) are examples of which of the following?

Chemistry

2 answers:

Lubov Fominskaja [6]2 years ago

4 0

1. A. Elements

2. False

3. C. Element

4. C. Hydrogen

5. True

ANTONII [103]2 years ago

4 0

Answer:

Explanation:

1. Lead (Pb), silver (Ag), and iron (Fe) are examples of which of the following? - Elements.

Elements are the primary constituents of matter which cannot be broken onto simpler forms. Thus the given elements also cannot be broken into simpler forms.

2. Elements can be broken down into simpler substances. - False

Elements cannot be broken down into simpler substances.

3. A substance made up of only atoms of one type is called a(n) - Element.

4. The most common element in the universe is - Hydrogen.

The most common element is basically oxygen, silicon, nitrogen, hydrogen, aluminum etc.

5. No two elements are exactly alike. - True

Yes, no 2 elements will have the similar constituents.

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Acetylsalicylic acid (C9H8O4) is a monoprotic acid commonly known as aspirin. A typical aspirin tablet, however, contains only a

pashok25 [27]

Answer:

6 grains

Explanation:

The equation of the reaction between NaOH and aspirin is;

C9H8O4(aq) + NaOH (aq) ------>C9H7O4Na(aq) + H2O(l)

Amount of NaOH reacted = concentration × volume = 0.1466 M × 14.40/1000 L = 2.11 × 10^-3 moles

Given that aspirin and NaOH react in a mole ratio of 1:1 from the balanced reaction equation above, the number of moles of aspirin reacted is 2.11 × 10^-3 moles

Hence mass of aspirin reacted = 2.11 × 10^-3 moles × 180.2 g/mol = 0.38 g

If 1 grain = 0.0648 g

x grains = 0.38 g

x= 0.38 g/0.0648 g

x= 6 grains

3 0

2 years ago

100 points

Mariana [72]

Answer:

Where is the puzzle!??

I surely can help you

5 0

2 years ago

Read 2 more answers

1) How many Joules of energy are released when 75g of water is heated

Pie

Answer: 23,199 J

Explanation:

8 0

1 year ago

Please help ill give you points and brainliest please

Paul [167]

Answer:

Answers with detail are given below

Explanation:

1) Given data:

Mass of Rb₃Rn = 76.19 g

Number of moles = ?

Solution:

Number of moles = mass/molar mass

Molar mass = 478.43 g/mol

Number of moles = 76.19 g/ 478.43 g/mol

Number of moles = 0.16 mol

2) Given data:

Mass of FrBi₂ = 120.02 g

Number of moles = ?

Solution:

Number of moles = mass/molar mass

Molar mass = 640.96 g/mol

Number of moles = 120.02 g/640.96 g/mol

Number of moles = 0.19 mol

3) Given data:

Mass of Zn₂F₃ = 88.24 g

Number of moles = ?

Solution:

Number of moles = mass/molar mass

Molar mass = 187.73 g/mol

Number of moles = 88.24 g/ 187.73 g/mol

Number of moles = 0.47 mol

4) Given data:

Number of moles of Sb₄Cl = 1.20 mol

Mass of Sb₄Cl = ?

Solution:

Number of moles = mass/molar mass

Molar mass = 522.49 g/mol

Mass = Number of moles × molar mass

Mass = 1.20 mol × 522.49 g/mol

Mass = 626.99 g

3 0

2 years ago

The decomposition of dinitrogen pentaoxide has an activation energy of 102 kj/mol and \delta ? h°rxn = + 55 kj/mol. what is the

posledela

A positive cahnge of enthalpy, ΔH rxn = + 55 kJ/mol, for the forward reaction means that the reaction is endothermic, i.e. the reactants absorb energy and the products are higher in energy.

Activation energy is the difference in the energy level of the reactants and the peak in the potential energy diagram (the energy of the transition state).

For an endothermic reaction, the products will be closer in energy to the transition state than what the reactans will be; so, the activation energy of the reversed reaction is lower than the activation energy of the forward reaction.

Activation energy of reverse and forward reactions is related by:

Activation energy of reverse rxn = Activation energy of forward rxn - ΔH rxn

=> Activiation energy of reverse rxn = 102 kJ/mol - 55 kJ/mol = 47 kJ/mol

Answer: 47 kJ/mol

8 0

3 years ago