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
Tanzania [10]
3 years ago
11

Hey um i dont get this yall wont to help me out???

Chemistry
1 answer:
den301095 [7]3 years ago
4 0
3. 9
20. 60 (1hour)
To get to 60 from 20 we multiply by three. 3 times 3 is 9.
A is true
B is true
C is true
D is true
E is false
You might be interested in
A student has a balloon with a volume of 2.5 liters that contains 4.0 moles of air. The ballon has a small leak, allowing one mo
Over [174]

Answer:

1.9 L

Explanation:

Step 1: Given data

  • Initial number of moles of air (n₁): 4.0 mol
  • Initial volume of the balloon (V₁): 2.5 L
  • Final number of moles of air (n₂): 3.0 mol
  • Final volume of the balloon (V₂): ?

Step 2: Calculate the final volume of the balloon

According to Avogadro's law, the volume of an ideal gas is directly proportional to the number of moles. We can calculate the final volume of the balloon using the following expression.

V₁ / n₁ = V₂ / n₂

V₂ = V₁ × n₂ / n₁

V₂ = 2.5 L × 3.0 mol / 4.0 mol

V₂ = 1.9 L

6 0
2 years ago
Which statement describes DNA?
GalinKa [24]

Answer:B

Explanation:

TRUST ME I JUST TOOK IT

6 0
3 years ago
Read 2 more answers
Which of these characteristics do these elements have in common?
Over [174]

C) They each form similar compounds when combined with oxygen.

Explanation:

The given elements have a common characteristics as they each form similar compounds when combined with oxygen.

Beryllium, magnesium and calcium all are located in the alkaline earth group.

Elements in the same group have the same chemical properties.

  • Density and melting point are physical properties of matter which varies down a group on the periodic table.
  • Their reaction with oxygen denotes a statement of their chemical properties.
  • Chemical properties of matter is a function of their valency.
  • Group two elements have a valency of two. They have two electrons in their outermost shell.
  • Therefore, they all form ionic bonds when they react with oxygen.

learn more:

Periodic table brainly.com/question/2690837

#learnwithBrainly

6 0
3 years ago
What do carbon, hydrogen, and oxygen atoms have in common?
horsena [70]

Answer:

electrons located outside the nucleus

Explanation:

electrons are said to be located outside the nucleus of an atom and are in orbit around the nucleus.

according to Bohr in 1913.

6 0
1 year ago
A reaction was performed in which 3.6 g 3.6 g of benzoic acid was reacted with excess methanol to make 1.3 g 1.3 g of methyl ben
Anit [1.1K]

<u>Answer:</u> The percent yield of the reaction is 32.34 %

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}     .....(1)

  • <u>For benzoic acid:</u>

Given mass of benzoic acid = 3.6 g

Molar mass of benzoic acid = 122.12 g/mol

Putting values in equation 1, we get:

\text{Moles of benzoic acid}=\frac{3.6g}{122.12g/mol}=0.0295mol

The chemical equation for the reaction of benzoic acid and methanol is:

\text{Benzoic acid + methanol}\rightarrow \text{methyl benzoate}

By Stoichiometry of the reaction

1 mole of benzoic acid produces 1 mole of methyl benzoate

So, 0.0295 moles of benzoic acid will produce = \frac{1}{1}\times 0.0295=0.108 moles of methyl benzoate

  • Now, calculating the mass of methyl benzoate from equation 1, we get:

Molar mass of methyl benzoate = 136.15 g/mol

Moles of methyl benzoate = 0.0295 moles

Putting values in equation 1, we get:

0.0295mol=\frac{\text{Mass of methyl benzoate}}{136.15g/mol}\\\\\text{Mass of methyl benzoate}=(0.0295mol\times 136.15g/mol)=4.02g

  • To calculate the percentage yield of methyl benzoate, we use the equation:

\%\text{ yield}=\frac{\text{Experimental yield}}{\text{Theoretical yield}}\times 100

Experimental yield of methyl benzoate = 1.3 g

Theoretical yield of methyl benzoate = 4.02 g

Putting values in above equation, we get:

\%\text{ yield of methyl benzoate}=\frac{1.3g}{4.02g}\times 100\\\\\% \text{yield of methyl benzoate}=32.34\%

Hence, the percent yield of the reaction is 32.34 %

6 0
3 years ago
Other questions:
  • Is 1000g same as 1cm3
    11·1 answer
  • If 4.35 KJ of
    6·1 answer
  • What ingredients are needed to make GHB?
    15·1 answer
  • Which one is it? Please? ​
    11·2 answers
  • Suppose that the gas-phase reactions A→B and B→A are both elementary processes with rate constants of 4.7×10−3s−1 and 5.8×10−1s−
    5·1 answer
  • Predict the formulas for calcium chloride and potassium phosphate
    15·1 answer
  • An electron na hydrogen atom moves from level to level 4 The electron then drops from level 4 to level 2. Which statement
    9·1 answer
  • A certain metal M forms a soluble nitrate salt M(NO3), Suppose the left half cell ofa galvanic cell apparatus is filled with a 4
    14·1 answer
  • I need help with this question
    6·1 answer
  • Describe the effects that constant stress can have on your body functions.
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!