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
maria [59]
3 years ago
13

Plssss heellllp!!!

Chemistry
2 answers:
mars1129 [50]3 years ago
8 0

Answer:

I feel like it is A, a theory might be supported by a scientific evidence but it might not be true overall, an opinion is someone expressing how they think or feel about something, it might also be supported by a scientific evidence but tbh I hope I got it right

Naddika [18.5K]3 years ago
7 0
A. A theory is supported by scientific evidence, while an option is not.
You might be interested in
F liquid water runs into an open space within a rock, like a crack, and the temperature drops to the freezing point of water, wh
vodomira [7]

Answer:

b or c is the answer

Explanation:

brainlest plz

4 0
2 years ago
Read 2 more answers
Calculate the pH after the addition of 10.0 mL of 0.240 M sodium hydroxide to 50.0 mL of 0.120 M acetic acid.
Goryan [66]

Answer:

pH = 4.58

Explanation:

The reaction of NaOH with acetic acid, CH₃COOH occurs as follows:

NaOH + CH₃COOH → CH₃COO⁻Na⁺ + H₂O

<em>Moles that react:</em>

NaOH = 10mL = 0.010L * (0,240mol / L) = 0.0024 moles NaOH

CH₃COOH = 50.0mL = 0.050L * (0.120mol / L) = 0.0060 moles CH₃COOH

That means after the reaction you will have:

CH₃COOH: 0.0060 mol - 0.0024 mol = 0.0036 moles

CH₃COO⁻Na⁺: 0.0024 moles

in solution, you will have the mixture of a weak acid (Acetic acid), with its conjugate base (sodium acetate, CH₃COO⁻Na⁺). And pH of this buffer can be determined using H-H equation:

pH = pKa + log [A⁻] / [HA]

For Acetic buffer pKa = 4.76:

pH = 4.76 + log [CH₃COO⁻Na⁺] / [CH₃COOH]

<em>Where [] is molarity of each species or moles</em>

<em />

Replacing:

pH = 4.76 + log [0.0024 moles] / [0.0036 moles]

<h3>pH = 4.58</h3>

<em />

6 0
3 years ago
Number of atoms in compound<br><br> Mg(OH)2
Crank

ANSWER

there are 20 number of atoms in compound

Explanation:

In a formula unit of Mg(OH)2, there are one magnesium ion and two hydroxide ions; or one magnesium, two oxygen, and two hydrogen atoms.

3 0
2 years ago
Để pha 2 lít dung dịch H2SO4 0,1N từ axit đặc 98% (d 1.84g/ml). Cần lấy bao nhiêu ml acid đặc
Ivanshal [37]

Answer:

Cm = Cn/n = 0.1/2 = 0.05 (M)

n = 0.05*2= 0.1 mol

m H2SO4= 0.1*98= 9.8 g

m dd H2SO4= 9.8/ 0.98 =10 g

V= 10/ 1.84 = 5.435 ml

Explanation:

5 0
2 years ago
What is the main source of energy for the water cycle.
viktelen [127]

Answer:

The main source of energy is the sun. The sun has a big part in the water cycle because it turns the water into water vapor. This cause the water cycle to start over again once it rains. Therefore, making the sun ne of the biggest parts in the water cycle.

7 0
1 year ago
Other questions:
  • What is the most significant breakthrough in forensic science since the development of fingerprinting?
    13·1 answer
  • A sample of water vapor has a volume of 3.15 L, a pressure of 2.40 atm, and a temperature of 325 K. What is the new temperature,
    5·1 answer
  • Compared to the nonmetals in Period 2, the metals in Period 2 generally have larger
    15·1 answer
  • Whats the difference between covalent and ionic bonds
    11·1 answer
  • This equation shows the combustion of methanol.
    5·1 answer
  • Classify the following as either solutions or colloids. If a colloid, name the type of colloid and identify both the dispersed a
    6·1 answer
  • When magnesium reacts with sulfuric acid the products are magnesium sulfate and hydrogen. If there are 15 grams of magnesium at
    14·1 answer
  • Which diagram represents an electrically neutral atom​?
    12·2 answers
  • -273 degrees = absolute zero
    14·2 answers
  • The fifth element in group 7 in astatine would you expect it to be gas, liquid, or solid? why?
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!