Which object is a good conductor of heat and electricity?

How many significant figures are in the measurement 0.03050

faltersainse [42]

There are 4 significant figures(3050)

8 0

3 years ago

Which sentence explains why gases can change volume but liquids cannot?

choli [55]

Answer: Molecules of gas are usually far apart and can be compressed unlike molecules of liquids.

Explanation:

The molecules of gases are usually far apart, moving freely and randomly, occupying extra space in the containing vessel. Hence, when compressed to become closely packed, gases have lower volume.

However, unlike gases, the molecules of a liquid are restricted, move less freely and occupy no extra space. Hence, liquids cannot be compressed, and their volume remains the same in their containing vessel.

8 0

3 years ago

Read 2 more answers

When an aqueous solution containing hydrochloric acid is just neutralized with an aqueous solution containing sodium hydroxide,

Elza [17]

Answer:

c. salty.

Explanation:

From the question,

The reaction of an acid , i.e hydrochloric acid and a base i.e. , sodium hydroxide takes place , which is a type of neutralization reaction,

Where the acid and a base reacts to give salt along with water .

From the question,

The reaction is as follows -

2 HCl + NaOH → NaCl + H₂O

Hence, the resulting product is a salt ,

Therefore , the resulting solution would taste like salt.

3 0

3 years ago

Describe how chemical reactions are affected by reaction conditions of monction?

Tems11 [23]

Answer:

hope his helps

Explanation:

Mention the factors affecting the rate of reaction

There are four main factors that can affect the reaction rate of a chemical reaction:

Reactant concentration. Increasing the concentration of one or more reactants will often increase the rate of reaction. ...

Physical state of the reactants and surface area. ...

Temperature. ...

Presence of a catalyst.

3 0

2 years ago

Mass of metal=0.0291. Volume of gas collected over water=25.67mL. Temperature=24.1C. Atmospheric pressure=754.6mmHg. Note: Metal

NISA [10]

Answers:

1) 732.1 mmHg; 2) 0.001 014 mol; 3) 0.001 014 mol; 4) 28.7 g/mol; 5) 187 ppt.

Explanation:

1) Partial pressure of hydrogen

You are collecting the gas over water, so

$p_{\text{atm}} = p_{\text{H}_{2}} + p_{\text{H}_{2}\text{O}}$

$p_{\text{H}_{2}} = p_{\text{atm}} - p_{\text{H}_{2}\text{O}}$

$p_{\text{atm}} = \text{754.6 mmHg}$

At 24.1 °C, $p_{\text{H}_{2}\text{O}} = \text{22.5 mmHg}$

$p_{\text{H}_{2}} = \text{754.6 mmHg} - \text{22.5 mmHg} = \textbf{732.1 mmHg}$

===============

2) Moles of H₂

We can use the Ideal Gas Law.

pV = nRT Divide both sides by RT and switch

n = (pV)/(RT)

p = 732.1 mmHg Convert to atmospheres

p = 732.1/760 Do the division

p = 0.9633 atm

V = 25.67 mL Convert to litres

V = 0.025 67 L

R = 0.082 06 L·atm·K⁻¹mol⁻¹

T = 24.1 °C Convert to kelvins

T = (24.1 + 273.15 ) K = 297.25 K Insert the values

n = (0.9633 × 0.025 67)/(0.082 06 × 297.25) Do the multiplications

n = 0.02473/24.39 Do the division

n = 0.001 014 mol

===============

3) Moles of metal

The partial chemical equation is

M + … ⟶ H₂ + …

The molar ratio of M:H₂ is 1 mol M:1 mol H₂.

Moles of M = 0.001 014 × 1/1 Do the operations

Moles of M = 0.001 014 mol M

===============

4) Atomic mass of M

Atomic mass = mass of M/moles of M Insert the values

Atomic mass = 0.0291/0.001 014 Do the division

Atomic mass = 28.7 g/mol

===============

5) Relative deviation in ppt

Your metal must be in Group 2 because of the 1:1 molar ratio of M:H₂.

The metal with the closest atomic mass is Mg (24.305 g/mol).

Relative deviation in ppt = |Experimental value – Theoretical value|/Theoretical value × 1000

Relative deviation = |28.7 – 23.405|/23.405 × 1000 Do the subtraction

Relative deviation = |4.39|/23.405 × 1000 Do the operations

Relative deviation = 187 ppt

3 0

3 years ago