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4 years ago

What are two main groups that make up matter?

Chemistry

2 answers:

Maslowich4 years ago

5 0

ATOMS AND MOLECULES HOPE THIS HELPS

zloy xaker [14]4 years ago

3 0

The two main substances that make matter is any substance that has mass and takes up space by having volume. This includes atoms and anything made up of these, but not other energy phenomena or waves such as light or sound

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What is true of a sample of gas as temperature is increased?

aniked [119]

Answer:

The particles move faster, and their average kinetic energy increases.

Explanation:

When the temperature of gases increases the reaction rates will increase. Molecules of gases will be furnished with higher kinetic energy. Kinetic energy is directly proportional to temperature. Increase in temperature causes the frequency of ordinary collisions and effective collisions per unit time to increase. This leads to a surge in kinetic energy too.

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3 years ago

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Atoms like sodium and lithium often lose electrons, which makes them

zvonat [6]

More reactive than others

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3 years ago

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How do the atoms of a molecule or compound stay together?

quester [9]

Intermolecular forces of attraction, the positive and negative charges of each are attracting each others

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3 years ago

In a typical calorimetry experiment (similar to what you did with the combustion of cheese balls), a small bag of Skittles (10.0

kolezko [41]

This question is incomplete, the complete question is;

In a typical calorimetry experiment (similar to what you did with the combustion of cheese balls), a small bag of Skittles (10.0 g) was combusted and the temperature of the water (1.00 kg) increased by 40.0 °C.

a) How much energy (in calories and Food calories) was released by the combustion of the Skittles

b) How many small bags of skittles would a 140 lb person have to eat in order to equal the amount of food calories burned by walking a marathon?

Marathon = 26.2 miles, average person burns 0.453 food calories/mile pound)

Answer:

Number of calories = 40000 Cal

Number of food calorie = 40 KCal

41.54 bags of skittles are required

Explanation:

Given that;

mass of water = 1kg = 1000g

change in Temp ΔT = 40°C

specific heat of H₂O = 4.84 = 1 Cal

Now

heat absorbed by the water = MSΔT

= 1000gm × 1 cal × 40°C = 40000 Cal

Number of calories = 40000 Cal

(since food calories = 1000 small calories)

Number of food calorie = 40 KCal

number of mile lb , if the man runs in the marathon will be;

26.2 × 140

= 3668 mile lb

0.453 food calorie is burned for 1 mile pound.

So, amount of food calorie required if the man runs in the marathon will be

0.435 × 3668 mile lb

= 1661.60 food calires.

now

40KCal food calorie is released by 10gm.

So, 1661.60 cal will be released from

⇒ (10gm × 1661.60) / 40 = 415.4 gm

now

1 bag = 10gm,

therefore 415.4 gm = 41.54 bags

∴ 41.54 bags of skittles are required

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3 years ago

in the combustion of octane, how many grams of oxygen are needed to completely react and produce 84.00 grams of carbon dioxide?

ryzh [129]

Answer:

95.4g

Explanation:

Given parameters:

Mass of carbon dioxide = 84g

Unknown:

Mass of oxygen = ?

Solution:

To solve this problem, we will simply work backward from the known to the unknown specie.

We first must write the balanced equation of the reaction;

2C₈H₁₈ + 25O₂ → 16CO₂ + 18H₂O

Now, convert the mass of CO₂ to number of moles;

Number of moles = $\frac{mass}{molar mass}$

Molar mass of CO₂ = 12 + 2(16) = 44g/mol

Number of moles = $\frac{84}{44}$ = 1.91moles

From the balanced equation,

16 moles of CO₂ is produced by 25 moles of O₂

1.91 mole of CO₂ will be produced by $\frac{1.91 x 25}{16}$ = 2.98mole of O₂

Now, we convert this moles of Oxygen gas to mass;

Mass of O₂ = number of moles x molar mass

= 2.98 x 2(16)

= 95.4g

3 0

4 years ago

Read 2 more answers