All categories

2 years ago

POSSIBLE POINTS: 1

Chemistry

1 answer:

olga_2 [115]2 years ago

5 0

Answer:

CLEANER

Explanation:

Independent variable is the variable in an experiment that is changed or manipulated by the experimenter in order to bring about a measurable response.

In this question, Marie notices that the current cleaner she is using on her shower is not cutting through the hard water build-up that has accumulated. She decides to purchase 3 other cleaners to see if one of them will do a better job of cutting through the stains. The CLEANERS being changed in this experiment is the INDEPENDENT VARIABLE.

You might be interested in

Please help asap. Brainliest to correct.

Law Incorporation [45]

Answer:

I guess this answer is c

7 0

2 years ago

Read 2 more answers

What is the empirical formula of a compound with a percent composition of 22.5% Phosphorous and 77.5% Chlorine?

sashaice [31]

Answer:

$\boxed {\boxed {\sf PCl_3}}$

Explanation:

We are given the percent composition: 22.5% phosphorus and 77.5% chlorine.

We can assume there are 100 grams of this compound. We choose 100 because we can simply use the percentages as the masses.

22.5 g P
77.5 g Cl

Next, convert these masses to moles, using the molar masses found on the Periodic Table.

P: 30.974 g/mol
Cl: 35.45 g/mol

Use the molar masses as ratios and multiply by the number of grams. $22.5 \ g \ P * \frac {1 \ mol \ P }{30.974 \ g \ P}= \frac {22.5 \ mol \ P }{ 30.974} = 0.7264157035 \ mol \ P$

$77.5 \ g \ Cl * \frac {1 \ mol \ Cl }{35.45 \ g \ Cl}= \frac {77.5 \ mol \ Cl }{ 35.45} \ =2.186177715 \ mol \ Cl$

Divide both of the moles by the smallest number of moles to find the mole ratio.

$\frac {0.7264157035} {0.7264157035} = 1$

$\frac {2.186177715}{0.7264157035}=3.009540824 \approx 3$

The mole ratio is about 1 P: 3 Cl, so the empirical formula is written as: PCl₃

4 0

2 years ago

How are dissolved minerals in water related to sedimentary rocks?

emmasim [6.3K]

Because they are both broke apart over time

4 0

2 years ago

Which one of the following is smallest in size

mario62 [17]

F- is the smallest because it accepts 1 electron 2 make its atomic number 10 making it have jst 2 orbitals but O²-,N³- and Na have their atomic number to be 18,17 and 11 respectively with 3 orbitals..
hope this helps *winks*

6 0

3 years ago

Read 2 more answers

A 0.100 m solution of a monoprotic weak acid has a ph of 3.00. what is the pka of this acid?

Lelechka [254]

Answer is: pKa for the monoprotic acid is 5.
Chemical reaction: HA(aq) ⇄ A⁻(aq) + H⁺(aq).
c(monoprotic acid) = 0.100 M.
pH = 3.00.
[A⁻] = [H⁺] = 10∧(-3).
[A⁻] = [H⁺] = 0.001 M; equilibrium concentration.
[HA] = 0.1 M - 0.001 M.
[HA] = 0.099 M.
Ka = [A⁻]·[H⁺] / [HA].
Ka = (0.001 M)² / 0.099 M.
Ka = 0.00001 M = 1.0·10⁻⁵ M.
pKa = -logKa = 4.99.

7 0

3 years ago

Read 2 more answers