All categories

2 years ago

A good hypothesis must be which of the following?

Chemistry

2 answers:

yanalaym [24]2 years ago

8 0

Testable, that is always required for a hypothesis. Otherwise, how can you prove it?

motikmotik2 years ago

4 0

Testable is the answer
hope it helps

You might be interested in

A chemist determined by measurements that 0.030 moles of barium participated in a chemical reaction. Calculate the mass of bariu

schepotkina [342]

Answer: 4.1 g of barium precipitated.

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number $6.023\times 10^{23}$ of particles.

To calculate the moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar Mass}}$

Given : moles of barium = 0.030

Molar mass of barium = 137 g/mol

$0.030=\frac{x}{137}$

x= 4.1 g

Thus there are 4.1 g of barium that precipitated.

3 0

2 years ago

I will give brainliest to whoever is first ❗️❕❗️❕❗️❕❗️

salantis [7]

3rd Answer. Rays reflect in random directions

5 0

2 years ago

Read 2 more answers

Show, in a step by step fashion, your calculations to determine the percent

marusya05 [52]

The percent by volume of a solution : 19.23%

<h3>Further explanation</h3>

Given

50 ml of ethanol

210 ml of water

Required

The percent by volume of a solution

Solution

Percent Volume (% v/v) : volume (ml) of solute/100 ml of solution ⇒ ratio of the volume of the solute to total volume of the solution

$\tt \%solute(v/v)=\dfrac{solute~volume}{solution~volume}\times 100\%$

solute= Ethanol

solvent=water

Solution = solute+solvent

Total volume of the solution :

$\tt =volume~of~Ethanol+solume~of~water\\\\=50~ml+210~ml\\\\=260~ml$

Percent by volume :

$\tt \%volume=\dfrac{50}{260}\times 100\%\\\\\%volume=19.23\%$

8 0

2 years ago

How many grams of O are in 605 g of Na,O?

Elden [556K]

Answer:

2Na2O2+2H2O⟶O2+4NaOH

2×78g 32g

156g of Na2O2 produces 32g of O2,

12g of Na2O2 produces =15632×12=10.66g.

Density of O2 at NTP=1.428g/mL.

DensityMass=Vol.

1.42810.66=7.46mL

Vol. of O2 at NTP is 7.46mL.

Explanation:

mark me as brainlist

6 0

1 year ago

Which of these hypotheses cannot be tested?

SVEN [57.7K]

Cooks should use sea salt in recipes instead of regular table salt.

7 0

2 years ago