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3 years ago

Please help me, I am struggling please help

Chemistry

1 answer:

saw5 [17]3 years ago

8 0

Answer:

Colors are seen by burning of metal salts, for example Sodium chloride makes yellow frame.
It is very common for fireworks to contain Aluminum, Iron, Steal, Zinc or the Magnesium’s dust to create bright light.

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=> The approximate mss of an electron is 1/10²⁷ g , Calculate the uncertainty in its velocity if the uncertainty in its posit

nasty-shy [4]

Answer:

Δx(m.Δv)=h/4π

here ,

Δv = uncertainty in velocity

10−11×10−27×Δv=6.626×10−34/4×22/7

=5.25×103ms−1

3 0

1 year ago

Read 2 more answers

Which mixture can be separated based on differences in particle size of the components?

Aleksandr [31]

Heterogenous mixtures can separates due to differences in size of components

7 0

3 years ago

________ properties can be observed only when the substance in a sample of matter are changed into different substances

RUDIKE [14]

I believe it's Chemical properties

5 0

3 years ago

Geraniol, C10H17OH, is an rose-scented alcohol commonly used in perfumes. How many grams of geraniol should be added to 600. mL

Maksim231197 [3]

Answer:

215.12 g

Explanation:

The change in the bolling temperature is a collateral property called ebullioscopy. The elevation on temperature occurs because there'll be a solute in the pure compound, and that solute(generally non-volatile) has a different boiling point, so the total bolling pint should increase.

To calculate the elevation in the temperature, we must use the Raoult equation:

ΔT = KbxWxi

Where ΔT is the variation of the temperature of boiling point, Kb is the

ebullioscopy constant, W is the molarity, and i the Vant' Hoff factor, which for molecules is also equal to 1, because they don't form ions. So:

82.00 - 78.40 = 1.22xW

W = 3.60/1.22

W = 2.9508

The molarity can also be calculated by:

$W = \frac{m1}{M1xm2}$

Where m1 is the mass of the solute (in grames), M1 is the molar mass of the solute, and m2 is the mass of the solvent (in kg).

The density of ethanol is 0.789 g/cm³, and 1 mL = 1 cm³, so 600.00 mL = 600.00 cm³ :

0.789 = m2/600

m2 = 473.4 g = 0.4734 kg

The molar mass of geraniol is:

C: 12 g/mol x 10 = 120 g/mol

H: 1 g/mol x 18 = 18 g/mol

O: 16 g/mol x 1 = 16 g/mol

M1 = 154 g/mol

Then:

$2.9508 = \frac{m1}{154x0.4734}$

m1 = 215.12 g of geraniol.

7 0

4 years ago

Calculate the mass in grams of each of the following using dimensional analysis:

Mashutka [201]

The mass in grams of each of the following using dimensional analysis is:

6.02 x 10²³ atoms of Mg = 12g of Mg
3.01 x 10²³ formula units of CaCl2 = 55.5g of CaCl2
12.4 x 10¹⁵ molecules of formaldehyde (CH2O) = 0.000000618g of formaldehyde

<h3>How to calculate mass?</h3>

The mass of a substance can be calculated in different ways depending on whether molecules or moles are given.

First, we need to convert atoms/formula units/molecules to moles as follows:

6.02 × 10²³ ÷ 6.02 × 10²³ = 1 mole of Mg
3.01 x 10²³ ÷ 6.02 × 10²³ = 0.5 moles of CaCl2
12.4 x 10¹⁵ ÷ 6.02 × 10²³ = 2.06 × 10-⁸ moles of formaldehyde

Next, we convert each mole value to mass as follows:

1 mole of Mg = 1 × 12 = 12g of Mg
0.5 moles of CaCl2 = 0.5 × 111 = 55.5g of CaCl2
2.06 × 10-⁸ moles of CH2O = 0.000000618g of formaldehyde

Learn more about mass at: brainly.com/question/19694949

#SPJ1

3 0

2 years ago