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3 years ago

7

Using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective sub

stance to melt the ice on a slick sidewalk.

1 answer:

Lisa [10]3 years ago

6 0

Sodium chloride because it contains the most reactive metal(sodium) and most reactive non-metal(chlorine).

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90 grams of glucose, C6H12O6, is dissolved in 2 liters of solution. Determine the molarity (M).

Masja [62]

Answer:

0.25 M

Explanation:

The first step is to determine how many moles of glucose there are, which means first finding out the molar mass of glucose. Carbon has a molar mass of about 12, hydrogen 1, and oxygen 16, so the total molar mass of glucose is about 6(12)+12(1)+6(16)=180 grams. This means that 90 grams is half a mole. Half a mole of substance divided by two liters of solution is (1/2)/2=1/4, or a molarity of 0.25. Hope this helps!

7 0

4 years ago

Every organism is an ecosystem receives energy from another source.Which of these organism receives its energy directly from the

Fed [463]

Answer:

The answer is grass

Explanation:

Grass is a plant, meaning it undergoes photosynthesis to receive its energy from the sun.

5 0

3 years ago

Read 2 more answers

In a chemical reaction, sulfur (S8) combines with copper to give a pure compound. If you start with 1.000 g of sulfur (S8) and o

Airida [17]

<u>Answer:</u> The empirical formula for the given compound is $Cu_2S$

<u>Explanation:</u>

We are given:

Mass of pure compound containing copper and sulfur = 4.963 g

Mass of S = 1.000 g

Mass of Cu = (4.963 - 1.000) g = 3.963 g

To formulate the empirical formula, we need to follow some steps:

<u>Step 1:</u> Converting the given masses into moles.

Moles of Copper = $\frac{\text{Given mass of Copper}}{\text{Molar mass of Copper}}=\frac{3.963g}{63.55g/mole}=0.0624moles$

Moles of Sulfur = $\frac{\text{Given mass of Sulfur}}{\text{Molar mass of Sulfur}}=\frac{1.000g}{32g/mole}=0.0312moles$

<u>Step 2:</u> Calculating the mole ratio of the given elements.

For the mole ratio, we divide each value of the moles by the smallest number of moles calculated which is 0.0312 moles.

For Copper = $\frac{0.0624}{0.0312}=2$

For Sulfur = $\frac{0.0312}{0.0312}=1$

<u>Step 3:</u> Taking the mole ratio as their subscripts.

The ratio of Cu : S = 2 : 1

Hence, the empirical formula for the given compound is $Cu_2S$

8 0

3 years ago

Describe the reaction of zinc with sulphuric acid

icang [17]

Answer:

Zinc reacts with dilute sulphuric acid to produce hydrogen gas (H2) and zinc sulphate. This is an example of displacement reaction of a non-metal by a metal. ... ZnSO4 is different in chemical composition and chemical properties than Zn and H2SO4 so it is a chemical change.

5 0

3 years ago

Read 2 more answers

which of the following groups use accounting information a.the tax department. b.business owners. c.investor. d.all of above

Ierofanga [76]

Answer:

D

Explanation:

if they didn't all use accounting skills and info I'd be considered

4 0

2 years ago