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3 years ago

Which of the following would you expect to happen to a sample of water with the salt potassium iodide (KI) added to it?

Chemistry

2 answers:

earnstyle [38]3 years ago

8 0

Answer: d

Explanation:

Alinara [238K]3 years ago

6 0

The correct answer is A: Vapor pressure lowering.

Certain properties in chemistry are called colligative properties. These colligative properties depends on the amount of solute present.

Examples of colligative properties include;

Vapor pressure lowering
Freezing point depression
Boiling point elevation
Osmotic pressure

When a solute is introduced into water, the vapour pressure of water is lowered.

Hence, when KI is added to a sample of water, vapor pressure lowering occurs.

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Which type of nuclear radiation is being emitted here?

tekilochka [14]

Answer:

b.Beta

Explanation:

mass number remains constant while atomic number has been increased by 1 unit . beta is electron like element where its mass number is 0 and atomic number is -1.

7 0

3 years ago

The density of methanol is 0.7918g/mL. Calculate the mass of 89.9mL of this liquid.

Novosadov [1.4K]

The mass is 71.2 g.

Mass = 89.9 mL × $\frac{0.7918 g}{1 mL}$ = 71.2 g

4 0

3 years ago

What is the empirical formula of the compound that is 25.3% magnesium and 74.7% chlorine

Margarita [4]

Answer: $MgCl_2$

Explanation:

25.3% Mg

74.7% Cl

First step: change % to g

25.3g Mg

74.7g Cl

Second step: calculate g/mol of each compound. You can do this by using the atomic mass.

$25.3gMg(\frac{1mol}{24.30g})=1.04mol$

$74.7gCl(\frac{1mol}{35.45g} )=2.11mol$

Third step: determine the lowest number and divide everything by it. Of the result, extract whole number only.

$Mg=\frac{1.04}{1.04} =1$

$Cl=\frac{2.11}{1.04}=2$

Fourth step: Write each compound with their respective number below.

This empirical formula should be: $MgCl_2$

4 0

3 years ago

Jake hangs two balloons from a desk so that they are close together but not touching. Jake rubs one balloon with a wool cloth. H

kari74 [83]

The objects that are rubbed together will create charges among themselves due to friction.
(1) The balloon rubbed with a wool cloth will be charged.
(2) If she comb near a small, uncharged object nothing will change.
(3) This is a scientific investigation because it does not involved a step by step process to answer a scientific query.

3 0

3 years ago

Read 2 more answers

Molten zinc chloride can be electrolysed.

Crank

Answer: The products of electrolysis are Zn(l) and $Cl_2$ gas

Explanation:

Electrolysis of a subastance is breaking it into its constituents by the action of electrical current.

In the electrolysis of molten zinc chloride, zinc metal is produced at the cathode which is a negative electrode and chlorine gas produces as the anode which is a positive electrode.

$ZnCl_2(l)\rightarrow Zn^{2+}+2Cl^-$

At anode : $2Cl^-(l)\rightarrow 2e^-+Cl_2(g)$

At cathode : $Zn^{2+}(l)+2e^-\rightarrow Zn(l)$

5 0

3 years ago