CHEMISTRY HIGH SCHOOL

How do you study well for a chemistry test?

Answers

Answer 1

Answer:

Answer:

Learning Chemistry takes time! ...

Dig Deep on practice problems. ...

Do the reading and warm up problems BEFORE lecture. ...

Lab Sections really do matter. ...

Ask lots and lots of questions! ...

Study chemistry when you are awake! ...

Study more efficiently – not just more! ...

Take advantage of study tips from VPTL:

Explanation:

Chemistry requires both memorization and problem-solving, making it a particularly demanding subject. 5. Study two hours for each lecture hour and one hour for each lab hour each week (this is about 12 hours a week for 4 credit hour chemistry courses).

Hope this helps! :D

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Find the element that makes milk good for your health. Is it a metal, nonmetal or metalloid?

Answers

Answer is Ca which is a metal.

Explanation: Milk is composed of many elements such as Calcium (Ca), Magnesium(Mg), Phosphorus(P), Potassium (K), Zinc(Zn) ans Selenium(Se). The major component present is Ca.

Calcium present helps in the formation of bones and teeth and maintaining it to keep healthy.

Elements which can loose electrons easily to obtain a stable configuration is called as a metal.

Calcium is a metal as it can easily loose 2 electrons to obtain a stable configuration.

$Ca\rightarrow Ca^(2+) +2e^-$

Final answer:

Calcium, a metal, is the element in milk that makes it beneficial for health. It contributes to healthy bones, teeth, and the proper functioning of various body organs. Metalloids or semimetals like boron or silicon are not responsible for the health benefits of milk.

Explanation:

The element that makes milk good for health is Calcium. Calcium is a metal that is needed by the body for healthy bones, teeth, and proper function of the heart, muscles, and nerves. It is a representative metal that shows good conduction of heat and electricity. Milk is a primary source of Calcium, which is why it is considered beneficial for health.

On the other hand, elements such as boron, silicon, germanium, arsenic, antimony, and tellurium are considered metalloids or sometimes semimetals, which exhibit properties between metals and nonmetals. However, these are not the elements responsible for the health benefits of milk.

Learn more about Calcium in Milk

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What is the IUPAC name for the compound FeS?(1) iron(II) sulfate (3) iron(II) sulfide
(2) iron(III) sulfate (4) iron(III) sulfide

Answers

The correct answer is option 3. The IUPAC name is Iron(II) sulfide. It is the less stable amorphous form. When this is powdered, it is pyrophoric or it ignites spontaneously in air. It readily reacts with hydrochloric acid producing hydrogen sulfide.

The IUPAC name for the compound FeS is "iron(II) sulfide." Therefore, option 3 is correct.

The IUPAC (International Union of Pure and Applied Chemistry) name is a systematic way of naming chemical compounds.

The compound FeS consists of iron (Fe) and sulfur (S) atoms. In FeS, iron has a +2 oxidation state, and sulfur has a -2 oxidation state.

According to the IUPAC nomenclature rules for naming inorganic compounds, the cation (iron) is named first, followed by the anion (sulfide).

To indicate the oxidation state of iron, the Roman numeral II is used in parentheses after the name "iron." The resulting name is "iron(II) sulfide."

To learn more about IUPAC, follow the link:

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Convert 55 kilometers per hour into meters per second. Use the conversion factor 1 km = 1000 m.55 ______/ _____ ´ 1000 _____/1 ______ ´ 1 ______/60 ______
´ 1 _____/60 _____ = 15 _____

Answers

Answer:

916.7 m/s

Explanation:

Given:

The value of speed = 55 km/hr

To determine:

The corresponding value in meters/second i.e m/s

Formula:

Step 1:

Convert km to m

1 km = 1000 m

Therefore, 55 km = 55 km * 1000 m/1 km = 55,000 m

The speed now is = 55,000 m/hr

Step 2:

Convert hr to sec

60 sec = 1 hr

Speed = 55,000 m/hr * 1 hr/60 sec = 916.7 m/s

55km/1hr x 1000m/1km x 1hr/60min x 1min/60sec =

(55 x 1000)/(60 x 60) =

55000/3600=

Answer: 15.28 m/sec

The breaking and making of chemical bonds can explain chemical reactions and energy flow. a. True b. False

Answers

The breaking and making of chemical bonds can explain chemical reactions and energy flow. a. True b. False

True

Molar mass CO2 is 44.01 g/mol. How many moles of LiOH are needed to react completely with 25.5 g of CO2?

Answers

Given:

Molar mass CO2 is 44.01 g/mol

25.5 g of CO2

Required:

Moles of LiOH

Solution:

Balanced equation is:

2LiOH +CO2 → Li2CO3 + H2O

25.5g CO2 (1 mole CO2/44.01 g/mol CO2)(2 moles LiOH/1 mol CO2) = 1.16 moles LiOH

Molarmass carbon dioxide is 44.01 g/mol, 1.16 moles of LiOH are needed to react completely with 25.5 g of CO₂.

Stoichiometry and the molar ratios of CO₂ and LiOH must be used to calculate the number of moles of LiOH required to totally react with 25.5 g of CO₂.

The reaction between CO₂ and LiOH has the following chemical formula:

CO₂ + 2LiOH -> Li₂CO₃ + H₂O

Now,

Molar mass of CO₂ = 44.01 g/mol

Mass of CO₂ = 25.5 g

Number of moles of CO₂ = Mass of CO2 / Molar mass of CO2

= 25.5 g / 44.01 g/mol

≈ 0.58 moles of CO2

As per this,

Number of moles of LiOH = 2 * Number of moles of CO2

= 2 * 0.58 moles

= 1.16 moles of LiOH