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4 years ago

How do the independent and dependent variables in an experiment compare?

1 answer:

4 0

An independent variable is the variable that is changed or controlled in a scientific experiment to test the effects on the dependent variable.

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How would a solution that is labeled 5.0 M would be read as?

cestrela7 [59]

The M stands for molar, so it would be 5.0 molar. is that what you need?

7 0

3 years ago

10. Hydrogen peroxide (H2O2: M = 34 g mol-1) is a powerful oxidising agent that is used in concentrated solution in rocket fuel

Lubov Fominskaja [6]

Answer:

The molality of solution=12.605 m

Explanation:

We are given that

Molar mass of Hydrogen peroxide, M=34 g/mol

Density of solution, $\rho=1.11gcm^{-3}$

30% Means mass of solute (Hydrogen peroxide)=30 g

Mass of solvent =100-30=70 g

Total mass of solution, m=100 g

Number of moles of solute= $\frac{given\;mass}{molar\;mass}$

Using the formula

Number of moles of hydrogen peroxide= $\frac{30}{34}$

Now, molality of solution

$m=\frac{number\;of\;moles\;of\;solute}{mass\;of\;solvent}\times 1000$

$m=\frac{30}{70\times 34}\times 1000$

$m=12.605 m$

Hence, the molality of solution=12.605 m

6 0

4 years ago

what explanation can you give for the fact that considerably different speeds of diffusion were reported for methyl salicylate?

EleoNora [17]

Explanation:

what explanation can you give for the fact that considerably different speeds of diffusion were reported for methyl salicylate?

8 0

3 years ago

The rate constant of the first-order reaction A→3B is 0.291 s−1. The concentration of A at t=5 seconds is 0.081 mol/L. What was

zimovet [89]

Answer : The initial concentration of A is, 0.347 mol/L

Explanation :

Expression for rate law for first order kinetics is given by:

$t=\frac{2.303}{k}\log\frac{a}{a-x}$

where,

k = rate constant = $0.291s^{-1}$

t = time passed by the sample = 5 s

a = initial amount of the reactant = ?

a - x = amount left after decay process = 0.081 mol/L

Now put all the given values in above equation, we get

$5=\frac{2.303}{0.291}\log\frac{a}{0.081}$

$a=0.347mol/L$

Therefore, the initial concentration of A is, 0.347 mol/L

7 0

3 years ago

How many electrons are needed in the molecule bcl3?

lubasha [3.4K]

The central boron atom in boron trichloride (BCl3) has six valence electrons as shown in Figure 1.2. Boron trichloride. There are a number of molecules whose total number of valence electrons is an odd number. It is not possible for all of the atoms in such a molecule to satisfy the octet rule.

4 0

3 years ago

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