1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Contact [7]
3 years ago
11

On the periodic table, in which period is copper?

Chemistry
1 answer:
Firdavs [7]3 years ago
3 0

Answer:

At the top of Group 11 above silver and gold.

Period 4

Explanation:

You might be interested in
Determine the volume in liters occupied by 22.6 g of I2 gas at STP.
AleksandrR [38]

 The volume in liters  occupied  by 22.6 g  of I₂  gas  at STP  is  1.99 L (answer A)

 <u><em>calculation</em></u>

Step: find the  moles of I₂

moles= mass÷  molar mass

from  periodic table the  molar mass  of I₂  is  253.8 g/mol

moles = 22.6 g÷253.8 g/mol =0.089 moles

Step 2:find the volume  of I₂  at STP

At STP  1  moles =22.4 L

         0.089 moles= ? L

<em>by cross  multiplication</em>

={ (0.089 moles x 22.4 L) /1 mole} = 1.99 L


6 0
4 years ago
PH is a logarithmic scale used to indicate the hydrogen ion concentration, [H+], of a solution: pH=−log[H+] Due to the autoioniz
ruslelena [56]

Answer:

  • A) pH = 2.42
  • B) pH = 12.00

Explanation:

<em>The dissolution of HCl is  HCl → H⁺ + Cl⁻</em>

  • To solve part A) we need to calculate the concentration of H⁺, to do that we need the moles of H⁺ and the volume.

The problem gives us V=2.5 L, and the moles can be calculated using the molecular weight of HCl, 36.46 g/mol:

0.35g_{HCl}*\frac{1mol_{HCl}}{36.46g_{HCl}} *\frac{1molH^{+}}{1mol HCl} = 9.60*10⁻³ mol H⁺

So the concentration of H⁺ is

[H⁺] = 9.60*10⁻³ mol / 2.5 L = 3.84 * 10⁻³ M

pH = -log [H⁺] = -log (3.84 * 10⁻³) = 2.42

  • <em>The dissolution of NaOH is  NaOH → Na⁺ + OH⁻</em>
  • Now we calculate [OH⁻], we already know that V = 2.0 L, and a similar process is used to calculate the moles of OH⁻, keeping in mind the molecular weight of NaOH, 40 g/mol:

0.80g_{NaOH}*\frac{1mol_{NaOH}}{40g_{NaOH}} *\frac{1molOH^{-}}{1mol NaOH}= 0.02 mol OH⁻

[OH⁻] = 0.02 mol / 2.0 L = 0.01

pOH = -log [OH⁻] = -log (0.01) = 2.00

With the pOH, we can calculate the pH:

pH + pOH = 14.00

pH + 2.00 = 14.00

pH = 12.00

5 0
3 years ago
A reaction between 46 grams of sodium and 71 grams of chlorine formed table salt and heat.
vazorg [7]

Answer:

d. 117 grams

Explanation:

The mass of the table salt produced will be 117 grams.

Chemical reactions obey the law of conservation of mass. In this regard, matter is neither created nor destroyed in the course of a chemical reaction. It is expected that the mass of the reactants and products remain the same.

 The reaction expression:

         2Na + Cl₂  →   2NaCl

So, mass of sodium  = 46g

      mass of chlorine formed = 71g

Mass of NaCl  = 46 + 71 = 117g

7 0
3 years ago
.What is the significance of genetic variation within the population of moths during and after the Industrial Revolution in Lond
den301095 [7]

A it is 37 by 46 x 806

3 0
3 years ago
In general, if the temperature of a chemical reaction is increased, the reaction rate
kaheart [24]
In general, if the temperature of a chemical reaction is increased, the reaction rate increases as well. The correct answer is A.
4 0
4 years ago
Other questions:
  • 10 examples of consumers
    12·2 answers
  • Is freshwater drum a consumer
    9·1 answer
  • Please help need answer asap!
    14·2 answers
  • What is the results when the following are subjected to the feeling’s test and why?
    13·2 answers
  • A manufacturing plant has been found guilty of polluting the nearby river. This is _______ pollution.
    11·2 answers
  • A gene for disease resistance in fir trees is transferred to pine trees using modern DNA technology. How might this be economica
    7·1 answer
  • What is the name of the orange metal visible after one week from iron + copper sulphate
    8·1 answer
  • A jogger runs 99yd in 10.00 seconds. What would be his time for a 458 m run at the same rate?
    11·1 answer
  • Use the image to answer the question.
    10·1 answer
  • There is free rotation about the carbons of ethane but not th
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!