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2 years ago

What feelings do you feel when you hear a song about rain?

Chemistry

2 answers:

dmitriy555 [2]2 years ago

3 0

Answer:

sad..................

sergiy2304 [10]2 years ago

3 0

Answer:

sad usually

Explanation:

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Investigations were carried out in a science lab to explore the topic of chemical and physical changes. Investigation A Step 1.

ozzi

Answer:

Investigation B, Step 2

Explanation:

The colour change is a good indication of a chemical change. The sugar molecules were most likely changing into something else.

Investigation A, Step 1. Wrong. The dissolving of salt is a physical process.

Investigation A, Step 2. Wrong. You simply boiled off the water (a physical process) and recovered the salt.

Investigation B, Step 1. Wrong. The dissolving of sugar is a physical process.

4 0

3 years ago

Read 2 more answers

Help for this practice work

allochka39001 [22]

Answer:

It's the third option.

Explanation:

In order for the chemical equation to be correctly it needs the same number of atoms of each element on both sides of the equal sign

8 0

2 years ago

Non-conjugated β, γ-unsaturated ketones, such as 3-cyclohexenone, as in base-catalyzed equilibrium with their α,β-unsaturated is

uranmaximum [27]

Answer:

See the attached file for the structure.

Explanation:

Find attached for the explanation

7 0

3 years ago

an unknown molecule is found to consist of 24.2% carbon by mass, 4.0% hydrogen by mass and the remaining mass is due to chlorine

Paha777 [63]

Answer:

C3 H6 Cl 3

Explanation:

C -24.2%

H - 4.0%

Cl - (100-24.2 - 4.0)=73.8 %

We can take 100g of the substance, then we have

C -24.2 g

H - 4.0 g

Cl - 73.8 g

Find the moles of these elements

C -24.2 g/12.0 g/mol =2.0 mol

H - 4.0 g/1.0 g/mol = 4. 0 mol

Cl - 73.8 g/ 35.5 g/mol = 2.1 mol

Ratio of these elements gives simplest formula of the substance

C : H : Cl = 2 : 4 : 2 = 1 : 2 : 1

CH2Cl

Molar mass (CH2Cl) = 1*12.0 +2*1.0 + 1*35.5 = 49.5 g/mol

Real molar mass = 150 g/mol

real molar mass/ Molar mass (CH2Cl) = 150 /49.5=3

So, Real formula should be C3 H6 Cl 3.

4 0

3 years ago

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How do you make a 3M solution of KBr? How many moles of KBr are 1 liter of a 0.3M solution?

pashok25 [27]

Molarity= moles/liter, so you would need 3mol KBr/1 liter
(0.3M)(1L)= 0.3mol KBr

8 0

2 years ago

Read 2 more answers