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
Ronch [10]
3 years ago
12

Some help with these would be much appreciated

Chemistry
1 answer:
alexira [117]3 years ago
7 0

Answer:

4. p

5.p

Explanation:

i just took the quiz and got a 100

You might be interested in
How would the pH value of an aqueous solution change, when the hydronium ion concentration is increased by a factor of 10?
Anna71 [15]

Answer:

Increasing H⁺ by 10x => pH decreases by 1 unit

Explanation:

In general, adding H⁺ ions to any aqueous solution ALWAYS causes pH values to fall ( decrease ). Just as adding OH⁻ ions to an aqueous solution causes pH values to rise ( increase ).

Here's a simple calculation demonstrating this...

Given 0.01M HCl(aq) => 0.01M H⁺(aq) + Cl⁻(aq) => pH = -log(0.01) = 2.00

Increase [H⁺] by 10x => 0.10M H⁺(aq) => pH = -log[H⁺] = -log(0.10) = 1.00

Solution with higher H⁺ concentration shows <u>pH decreasing by 1 unit.</u>

______________________________________________________-

Just to support the above statement about adding OH⁻ ions showing an increase in pH values, the following is also provided FYI ..

Given 0.01M NaOH(aq) => 0.01M OH⁻(aq) + Na⁺(aq) => pOH = -log(0.01) = 2.00 => pH = 14 - pOH = 14 - 2 = 12

Increase [OH⁻] by 10x => 0.10M OH⁻(aq) => pOH = -log[OH⁻] = -log(0.10) = 1.00 => pH = 14 - pOH = 14 - 1 = 13

Increasing [OH⁻] by 10x => <u>increasing pH by 1 unit. </u>

Solution with higher H⁺ concentration shows pH decreasing by 1 unit.

______________________________________________________

Remember, for <u>any</u> aqueous solution ...

=> Adding H⁺   => always decreases pH

=> Adding OH⁻ => always increases pH

4 0
3 years ago
Gold has density of 19.3 g/cm3; how many grams of gold are in a 16.0 cm3 gold bar?
Andre45 [30]
To determine the mass of gold, we simply multiply the density and volume. Density is a value for mass, such as kg, divided by a value for volume, such as m3. Density is a physical property of a substance that represents the mass of that substance per unit volume. We do as follows:

mass = density x volume
mass = 19.3 g/cm^3 ( 16.0 cm^3 )
mass = 308.8 g
6 0
3 years ago
Thermal energy _____ as temperature increases
Romashka-Z-Leto [24]
A. increases

As the temperature increases, the average kinetic energy of the particles in an object will increase. If the temperature of an object doesn't change, the thermal energy will increase as the mass of the object increases.

hope this helps <3
5 0
2 years ago
I need help with the last two questions please help quickly!!
Talja [164]

Not sure about the last one, but I think the percent composition of zinc would be ~ 42.8232

6 0
2 years ago
how many grams of oxygen reacted with 50.7f of potassium? how many molecules of potassium oxide are formed?​
tekilochka [14]

Answer:

be more specific. please

5 0
2 years ago
Read 2 more answers
Other questions:
  • What particles do during phase changes
    10·1 answer
  • When 14.8 g KOH is dissolved in 85.6 g of water in a coffee-cup calorimeter, the temperature rises from 19.3 °C to 32.76 °C. Wha
    8·1 answer
  • A gas in a piston starts out with a volume of 156 mL, a temperature of 28.1oC, and a pressure of 1.12 atm. If it ends with a vol
    7·1 answer
  • 3CuCl2 + 2Al =&gt; 3Cu + 2AlCl3
    7·1 answer
  • The rate constant of an SN1 reaction depends on the nucleophile b. The rate constant of an SN2 reaction does not depend on the n
    11·1 answer
  • What is the name of Na3N?<br> HELP PLEASEEEE !!!!
    5·1 answer
  • g The following equation is given for the dissociation of the complex ion Ag(NH3) 2. The dissociation constant, Kd, is the equil
    8·1 answer
  • Why do you think evolution is important?
    14·2 answers
  • Show is a pedigree chart. the chart shows that sally is carrier for red-green color blindness​
    6·1 answer
  • How does the lithosphere affect wildfires
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!