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3 years ago

If you were to burn a candle inside of a closed jar and the mass of the

Chemistry

1 answer:

sp2606 [1]3 years ago

8 0

Answer:

50g

Explanation:

At the end of the burning process, the mass of the jar and smoke should be 50g after the candle burning is done.

In most systems, the law of conservation of matter finds expression. According to this law "matter is neither created nor destroyed but atoms are rearranged".

In this kind of system, no matter is allowed to escaped and the starting mass of the reactants compared to that of the product will be the same.

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What temperature does ice freeze

Gwar [14]

Answer:

32°F

Explanation:

Water freezes at 32°F.

8 0

3 years ago

Read 2 more answers

Will mark branliest. Calculating percent yield: For the reaction Cu + 2AgNO3 → Cu(NO3)2 + 2 Ag, adding 127 grams of copper to lo

pishuonlain [190]

Percent yield = (Actual Yield/ Theoretical Yield) x 100

Given, Actual Yield of silver = 410 grams

Given, mass of copper = 127 g

Atomic mass of copper = 63.546 amu

Formula: Moles = mass / atomic mass

Moles of copper = 127 g/ 63.546 amu = 1.998 mol

Based on the given balanced chemical reaction, the molar ratio between Cu: Ag is 1:2

So 1.998 mol of copper should yield (2 mol Ag/ 1 mol Cu) x 1.998 mol of Cu = 3.996 mol

Calculated mol of Ag = 3.996 mol

Atomic mass of silver = 107.8682 amu

Mass of silver = moles x atomic mass = 3.996 mol x 107.8682 amu = 431 g

Based on the math, the theoretical yield = 431 g

Percent yield of silver = (410g/431g) x 100 = 95. 13%

The answer is 95. 13%

8 0

4 years ago

Plants or animals with desirable characterstics are bred together to create improved varieties. What is this process called?

STatiana [176]

Answer:

cross breeding or selective breeding its common with dogs

Explanation:

3 0

3 years ago

The speed of a spaceship is going warp 7.58. What is the velocity of the spaceship in cm/min. Assume 1.00 warp = 2.5 times the s

grandymaker [24]

Answer : The velocity of the spaceship is, $3408.6\times 10^{10}cm/min$

Solution :

As we are given that,

$1.00\text{ wrap }=2.5\times \text{The speed of light}$

The speed of a spaceship = 7.58 wraps

So, $7.58\text{ wrap }=7.58\times 2.5\times \text{The speed of light}$

The speed of light = $2.9979\times 10^8m/s$

Now put the value of speed of light in above expression, we get

So, $7.58\text{ wrap }=(7.58)\times (2.5)\times (2.9979\times 10^8m/s)=56.81\times 10^8m/s$

The velocity of the spaceship = $56.81\times 10^8m/s$

Now we have to convert the velocity of the spaceship m/s to cm/min.

Conversion :

(1 m = 100 cm)

(1 min = 60 sec)

The velocity of the spaceship = $(56.81\times 10^8)\times 100\times 60cm/min=3408.6\times 10^{10}cm/min$

Therefore, the velocity of the spaceship is, $3408.6\times 10^{10}cm/min$

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3 years ago

5. The reaction A - C is shown in the diagram below. Is the reaction exothermic or

velikii [3]

Answer:

Exothermic reaction.

Explanation:

From the question given, we obtained the following:

The equation for the reaction:

A —> C

From the diagram given in the question above, the reactant, A has a higher energy than the product, C. This simply indicates exothermic reaction as the enthalphy change, ΔH will be negative for the reaction.

Enthalpy change, ΔH is simply the difference between the heat of product, Hp and the heat of reactant, Hr i.e

ΔH = Hp – Hr

Since the heat of the product is small, the enthalphy change, ΔH will be negative indicating that heat has be released to the surroundings. This is termed exothermic reaction.

8 0

3 years ago