All categories

4 years ago

Help me? Chemistry please

Chemistry

1 answer:

aksik [14]4 years ago

8 0

Answer:

A- 1 hydrogen, 1 oxygen, 1 chlorine

B- 2 Nitrogen, 4 hydrogen

C- 2 sodium, 2 oxygen

the last one i dont understand because im in middle school and i havent learned that... :/

Explanation:

You might be interested in

What is the percent of SO2 in H2SO4? Help Please

Yakvenalex [24]

The percent of SO₂ in H₂SO₄ : 65.3%

<h3>Further explanation </h3>

Proust states the Comparative Law that compounds are formed from elements with the same Mass Comparison so that compounds have a fixed composition of elements

%Mass A in AxBy =

$\tt \dfrac{x.Ar~A}{MW~A_xB_y}\times 100\%$

For SO₂ in H₂SO₄ :

MW SO₂ = 32 + 2.16=64 g/mol

MW H₂SO₄ =2.1+32+4.16=98 g/mol

The percent of SO₂ :

$\tt \dfrac{64}{98}\times 100\%=65.3\%$

3 0

3 years ago

How do elasticity ang flexibility differ?

Paraphin [41]

Answer:

the object will regain its original form as soon as the deforming force is removed. ... Flexibility means the object is just easily deformed, and will stay that way.

Explanation:

7 0

3 years ago

Solutions, _____ colloids, _____ light.

soldi70 [24.7K]

Answer: unlike, will not scatter

Explanation:

Colloids are unlike solutions because their dispersed particles are much larger than those of a solution. The dispersed particles of a colloid cannot be separated by filtration, but they scatter light, a phenomenon called the Tyndall effect.

7 0

3 years ago

A solution is made by dissolving 4.35 g of glucose (C6H1206) in 25.0 mL of water at 25 °C.Calculate the molality of glucose in t

Roman55 [17]

Answer:

The molality is unchanged (0.96 molal)

Explanation:

Step 1: Data given

mass of glucose = 4.35 grams

volume of water = 25.0 mL

Density of water = 1.00 g/mL

Molar mass of glucose = 180.156 g/mol

Step 2: Calculate number of moles

moles of glucose = mass of glucose / Molar mass of glucose

moles of glucose = 4.35 grams / 180.156 g/mol

moles of glucose = 0.024 moles

Step 3: Calculate mass of water

mass = density * volume

mass of water = 1.00 g/mL * 25.0 mL

mass of water = 25 g = 0.025 kg

Step 4: Calculate molality

molality = Number of moles / mass of water

molality = 0.024 moles / 0.025 kg

molality = 0.96 molal

Suppose you take a solution and add more solvent, so that the original mass of solvent is doubled.

This means double mass of water = 2*0.025 kg = 0.050 kg

Now molality is 0.024 moles / 0.050 kg = 0.48 molal

When the mass of solvent is doubled, the molality is halved from 0.96 molal to 0.48 molal

You take this newsolution and add more solute, so that the original mass of the solute is doubled.

This means double mass of glucose = 2*4.35 g = 8.70 g

8.70 grams of glucose = 8.7 grams * 180.156 g/mol = 0.048 moles

molality = 0.048 moles / 0.050 kg = 0.96 molal

The molality is unchanged

5 0

4 years ago

Which best describes the purpose of bar graphs?

Ymorist [56]

They compare quantities for particular cattle

3 0

3 years ago

Read 2 more answers