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3 years ago

Please help me Thank you

Chemistry

1 answer:

Mamont248 [21]3 years ago

6 0

Answer:

Explanation:

A is the answer because it is explaining how wolves are ancestors of dogs

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Silver has a density of 10.5 g/cm³, and gold has a density of 19.3 g/cm³. Which would have a greater mass, 5 cm³ of silver or 5

Vedmedyk [2.9K]

Gold have a greater mass

<h3>Further explanation </h3>

Density is a quantity derived from the mass and volume

Density is the ratio of mass per unit volume

The unit of density can be expressed in g/cm³ or kg/m³

Density formula:

$\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}$

ρ = density

m = mass

v = volume

mass of Silver :

$\tt mass=\rho\times V\\\\mass=10.5\times 5=52.5~g$

mass of Gold :

$\tt mass=\rho\times V\\\\mass=19.3\times 5=96.5~g$

8 0

3 years ago

Given a gas with an initial volume of 3.0 L and a temperature of 290 K, what is the final volume if the

statuscvo [17]

Answer:

2.8l

Explanation:

just make v2 de subject

6 0

3 years ago

A candle slowly burns until the last bit of wax and wick are gone. The two reactants in this chemical reaction are the wick and

Aleonysh [2.5K]

The component of the candle burning in the surrounding has been the oxygen in the air.

The burning of candle wax and wick has been the chemical reaction. It has been based on the reaction of wick with the atmospheric oxygen, resulting in the formulation of the wax burning.

<h3>Chemical reaction of burning of wax</h3>

The wax has been vaporizes by the heat of the flame, that has been resulted by the burning. The wick has been able to react with the oxygen and form the byproducts that helps in flame burning.

The end products have been wick and oxygen as the wax has been consumed in the reaction. The air in the surrounding has oxygen as the part of the system, as it has been involved in the reaction.

Learn more about candle burning, here:

brainly.com/question/25955977

6 0

3 years ago

CH3COOH(aq) + NaOH(aq) â†’ H2O(l) + NaCH3COO(aq)

ser-zykov [4K]

I believe this is a double replacement. As you can see none of the chemical symbols are missing, there just "replaced".

3 0

3 years ago

If 5.12 liters of a 2.75 M phosphoric acid is neutralized by magnesium hydroxide solution of 4.00 M.

Tresset [83]

Answer:

5.28 L

Explanation:

Step 1:

Data obtained from the question.

Volume of acid (Va) = 5.12L

Molarity of acid (Ma) = 2.75M

Molarity of base (Mb) = 4M

Volume of base (Vb) =.?

Step 2:

The balanced equation for the reaction

2H3PO4 + 3Mg(OH)2 → Mg3(PO4)2 + 6H2O

From the balanced equation above,

Mole ratio of the acid (nA) = 2

Mole ratio of the base (nB) = 3

Step 3:

Determination of the volume of the base.

This is illustrated below:

MaVa/MbVb = nA/nB

2.75 x 5.12 / 4 x Vb = 2/3

Cross multiply

4 x 2 x Vb = 2.75 x 5.12 x 3

Divide both side by 4 x 2

Vb = (2.75 x 5.12 x 3)/(4 x 2)

Vb = 5.28 L

Therefore, the volume of the base is 5.28 L

8 0

4 years ago

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