If you hold a jar over a lit candle,a dark residue forms on the inside of the jar. This residue is

What is the equation between aqueous sodium carbonate and dilute hydrochloric acid

deff fn [24]

Answer:

When solutions of sodium carbonate and hydrochloric acid are mixed, the equation for the hypothetical double displacement reaction is: Na2CO3 + 2 HCl → 2 NaCl + H2CO3 Bubbles of a colorless gas are evolved when these solutions are mixed.

8 0

3 years ago

What can you summarize about the use of acid-base indicators?

densk [106]

An acid-base indicator is used to identify the presence of an acid or base. These indicators exhibit different colors depending on the solution that they are in. They are especially useful when completing titrations to determine the molarity of an unknown substance and is denoted as option D.

<h3>What is Titration?</h3>

This is done in the laboratory and involves the slow addition of one solution of a known concentration to a known volume of another solution of unknown concentration.

Acid-base indicators are used to determine the presence of an acid or base in a solution which is based on the colors seen when performing the chemical reaction.

It is used to calculate the the molarity of an unknown substance through the knowledge of the other parameters which is therefore the reason why option D was chosen as the most appropriate choice.

Read more Acid-base indicators here brainly.com/question/2815636

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6 0

1 year ago

A student uses a lever and fulcrum to lift a rock off the ground.

klio [65]

Answer:B

Explanation: I know this because kinetic energy is when something is moving and potential energy is when something is not moving and the energy is being stored so it has you are pushing on the other side moving the object it is transforming the potential energy also known as stored energy into movement also known as kinetic energy

7 0

3 years ago

Read 2 more answers

what is the minimum mass of ethylene glycol that must be dissolved in 14.5 kg of water to prevent the solution from freexing at

lbvjy [14]

Answer:

The minimum mass of ethylene glycol = 6.641 Kg

Explanation:

$\Delta T_f= T_f-T_f'\\T_f'=T_f-\Delta T_f$

Where T_f = freezing point of pure solvent water, 0°C

T_f'= Freezing point of solvent after mixture

K_f = Freezing point depression constant = 1.86 °C/m

Moecular weight of ethylene glycol = 60 g/mol

Weight of ethylene glycol = 14.5 Kg= 14.5×10^3 g

molality of ethylene glycol

$m = \frac{weight}{mol.wt} \times\frac{1000}{V}$

Substitute the values to calculate m

$m = \frac{w}{60} \times\frac{1000}{14.5\times1000}$

by formula

$0-(-14.2) =1.86\frac{w}{60} \times\frac{1000}{14.5\times1000}$

calculating we get w = 6641.93 g

Therefore, The minimum mass of ethylene glycol = 6.641 Kg

4 0

3 years ago

If Brian and his scooter had a mass of 50 kg, how much force would it take for him to accelerate at 0.8 m/s2

OleMash [197]

Answer:

<h2>The answer is 40 N</h2>

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

<h3>force = mass × acceleration</h3>

From the question

mass = 50 kg

acceleration = 0.8 m/s²

We have

Force = 50 × 0.8

We have the final answer as

Hope this helps you

8 0

3 years ago