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tamaranim1 [39]
3 years ago
15

I need help with both parts, ill give brainliest and 30 points

Chemistry
2 answers:
Paul [167]3 years ago
7 0

Answer:

part a=A. A physical change, then a chemical change

part b:evidence

without physical change any sorts of chemical change do not take place.

for example: when sugar is heated on spoon the physical change takes place in sugar .sugar starts to form liquid from solid.

sweet-ann [11.9K]3 years ago
6 0

Answer:

Part A. C would be your answer I think

Sugar is made of carbon, hydrogen and oxygen atoms. When heated over a candle, these elements react with the fire to turn into a liquid. The heat causes the sugar's atoms to combine with the oxygen in the air, forming new groups of atoms. Energy is released in this chemical reaction in the form of smoke and black soot.

Part B. I don't know I just think of the answer... Meaning I'm good and science, Chemistry and all that good stuff ;-;

Explanation:

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solid sodium reacts violently with water producing heat, hydrogen gas and sodium hydroxide. How many molecules of hydrogen gas a
Blababa [14]
Molar mass of sodium=23g
2 mole sodium gives 2 g H2
i.e 46g sodium gives 2g H2
so 65.4g will give=2.84g H2
now no. of molecules = 2.8/2*avogadros number
5 0
3 years ago
How many milliliters of a 1.5 m h2so4 are needed to neutralize 35ml sample of a 1.5 m solution?
DochEvi [55]

Answer:

1) 17.5 mL

Explanation:

Hello,

In this case, the reaction between sulfuric acid and potassium hydroxide is:

H_2SO_4+2KOH\rightarrow K_2SO_4+2H_2O

In such a way, we notice a 1:2 molar ratio between the acid and the base, therefore, at the equivalence point we have:

2*n_{acid}=n_{base}

And in terms of concentrations and volumes:

2*M_{acid}V_{acid}=M_{base}V_{base}

Thus, we solve for the volume of acid:

V_{acid}=\frac{M_{base}V_{base}}{2*M_{acid}} =\frac{35mL*1.5M}{2*1.5M} \\\\V_{acid}=17.5mL

Best regards.

5 0
3 years ago
Can you please help me I need help<br><br> Thank you to the person that helped
Black_prince [1.1K]

Answer:

Model

Theory

Ellipse

Explanation:

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7 0
2 years ago
Read 2 more answers
Why does my hand get cold when I pick up a snowball?
Kitty [74]

Answer:

Cause snow is cold.

Explanation:

THANK YOU

7 0
3 years ago
How many grams of sulfur are in 3.54 g of H2S?
ira [324]

Answer:

3.329 g

Explanation:

First you need to determine the molar mass of H2S which is 34.1 g/mol.

With that we know that to find the moles of H2S we just divide the mass of sample with the molar mass.

3.54 g / 34.1 g/mol = 0.103812317  mol of H2S

This means that there is also 0.103812317  mol of sulfur since there is 1 mole of sulfur per 1 mole of H2S.

The molar mass of sulfur is 32.065 g/mol and to find the mass of sulfur you need to multiply the molar mass with the moles of the compound.  

0.103812317  mol * 32.065 g/mol = 3.329 g of sulfur

Let me know if you get something else or if something is unclear in the comments so that we can figure it out.

5 0
3 years ago
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