I have to write a 150 word paragraph or two that describes at least three everyday things that exist or occur because of science. I also have to make sure i use examples. I don't have a clue where to start ??? PLEASE help!

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Answer 1

Answer: You can do something like natural disasters and explain why they happen

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In a calorimetry experiment, an unknown mass of glass (c = 0.8372 J/g oC) at 90.0 oC is dropped into a calorimeter (c = 1.23 J/g oC, m = 7.0 g) that contains 75.0 g of water. If the temperature increases from 24.3 oC at the beginning of the experiment to 26.6 C by the end, what was the mass of the glass?

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Answer:

To solve this problem, we can use the calorimetry formula that relates the heat transfer between the system and the surroundings:

Q = mc∆T

where Q is the heat transfer, m is the mass, c is the specific heat capacity, and ∆T is the temperature change.

We can assume that the heat lost by the glass and the calorimeter is equal to the heat gained by the water. Therefore, we can write:

Qglass + Qcalorimeter = Qwater

Substituting the values given in the problem, we get:

mglass x 0.8372 x (26.6 - 90) + 7 x 1.23 x (26.6 - 24.3) = 75 x 4.184 x (26.6 - 24.3)

Solving for mglass, we get:

mglass = 10.8 g

Therefore, the mass of the glass was 10.8 g.

I hope this answer helps you understand how to use the calorimetry formula to find the mass of an object. Thank you for chatting with me.

If you have 3.50 moles of hydrogen and 5.00 moles of nitrogen to produce ammonia, how much ammonia (in grams) is produced? 3H2 + N2 --> 2NH3

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If we have 3.50 moles of hydrogen and 5.00 moles of nitrogen to produce ammonia, 39.66g ammonia is produced.

What is mole concept?

Avogadro's number is the number of units in one mole of any substance and equals to 6.02214076 × 10²³. The units can be electrons, atoms, ions, or molecules.

No. of moles is defined as a particular no. of particles that we can calculate with the help of Avogadro’s number.

Mass of a particular product is also find out by stoichiometry of a reaction as per the no. of mole given in the reaction.

Given,

3H₂ + N₂ --> 2NH₃

3.50 moles of hydrogen

5.00 moles of nitrogen

Limiting reagent for the reaction is H₂.

3 moles of H₂ produce 2 moles NH₃

1 moles of H₂ produce 2/3 moles NH₃.

3.5 moles of H₂ produce (2÷3)×3.5 moles NH₃ = 2.33 moles

1 mole of NH₃ = 17g of NH₃

2.33 mole of NH₃ = 39.66g of NH₃

Therefore, If we have 3.50 moles of hydrogen and 5.00 moles of nitrogen to produce ammonia, 39.66g ammonia is produced.

Learn more about mole concept, here:

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If you have 3.50 moles of hydrogen and 5.00 moles of nitrogen to produce ammonia, how much ammonia (in grams) is produced?
3H2 + N2 --> 2NH3
3.5 moles H2 (2 moles NH3/3 moles H2) (17 grams NH3/1 mole NH3) = 40 grams NH3

The heat of combustion of propane, C3H8, is 2220 kJ/mol. The specific heat of copper is 0.385 J/g°C. How many grams of propane must be burned to raise the temperature of a 10.0 kg block of copper from 25.0°C to 65.0°C, assuming none of the heat is lost to the surroundings?

Answers

The heat of combustion ( $\Delta$ Hc0) is the amount of energy released as heat when a compound completely burns with oxygen under standard conditions.

3.05988g. grams of propane must be burned to raise the temperature of a 10.0 kg block of copper from 25.0°C to 65.0°C.

What is meant by heat of combustion?

The heat of combustion ( $\Delta$ Hc0) is the amount of energy released as heat when a compound completely burns with oxygen under standard conditions. In most cases, a hydrocarbon reacts with oxygen to produce carbon dioxide, water, and heat.
The heat of combustion of a substance is the amount of energy released when a specific amount (e.g., 1 mol, 1g, 1 L) of the substance completely burns in oxygen. The heat of combustion is typically measured at 298K (25 C) and 101.3kPa.
The energy released when a substance X completely burns with an excess of oxygen under standard conditions (25°C and 1 bar). It is the inverse of the enthalpy change for the combustion reaction in thermodynamic terms.

q=m*c*(change of T)

q=10000g(0.385J/g*c)*(65.0C-25.0C)or (338.2 K-298.2K)

q=154000J

154000J*(1 mol/2220 KJ)=69.36936 x $10 ^-3$ mol

here's where I'm stuck

0.069369 mol

and i know that for every 1 mol there is 44.11g of C3H8.

0.069369 mol* (44.11g C3H8)/1mol = 3.05988g.

To learn more about : Heat of combustion

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Answer:

Explanation:

q = (mass) (temp change) (specific heat)

q = (10000 g) (40 °C) (0.385 J/g⋅°C) = 154000 J = 154 kJ

154 kJ / 2220 kJ/mol = 0.069369369 mol

0.069369369 mol times 44.0962 g/mol = 3.06 g (to three sig figs)

answer choice 4

In chemistry class, Allen determined the effectiveness of various metals in releasing hydrogen gas from hydrochloric acid. Several weeks later, Allen read that a utilities company was burying lead next to iron pipes to prevent rusting. Allen hypothesized that less rusting would occur with the more active metals. He placed the following into 4 separate beakers of water: (a) 1 iron nail, (b) 1 iron nail wrapped with an aluminum strip, (c) 1 iron nail wrapped with a magnesium strip, and (d) 1 iron nail wrapped with a lead strip. He used the same amount of water, equal amounts (mass) of the metals, and the same type of iron nails. At the end of 5 days, he rated the amount of rusting as small, moderate, or large. He also recorded the color of the water. What is the independent variable?a) the amount of water
b) the metals strips
c) amount of rust
d) hydrochloric acid

Answers

Answer:

b) the metals strips

Explanation:

In an experimental design, an independent variable is a variable that is changed or manipulated in a series of experiments. An independent variable is not dependent on any other variable in the experiment. The hypothesis for this experiment is stated to be: "If the chemical activity of the metallic wrapper is increased, then less rusting of iron will occur. The independent variable relates to the type of metal wrapping strip, and the dependent variables are the amount of rusting and color of the water.

Which if the following questions can be answered by science?

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Answer:

Need the choices before i can give answers thanks

Explanation:

Explain how humans have impacted the biome in which you live which is missouri

Answers

humans have impacted wwell almost everything including the technology well the biome includes them because of there radiation power and the next que is confusing. sorry

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