Title: Oletus kohteelle Fysiikka ja kemia 2 osp kopio
Course: Physical and chemical phenomena and their application

Kohteessa 'Fysiikka ja kemia 2 osp kopio' jaettujen kysymysten oletuskategoria.

Feedback shared by this category's questions, if right: Vastauksesi on oikein.
Feedback shared by this category's questions, if partly right: Vastauksesi on osittain oikein.
Feedback shared by this category's questions, if wrong: Vastauksesi on väärin.

Q: Tunnistatko kemiallisia ilmiöitä, merkintöjä ja käsitteitä?
- Lämmin vesi puhdistaa paremmin kuin kylmä vesi. | Pintajännitys
- Aine laajenee lämmetessään. | Lämpöliike
- Veden ja ruokaöljyn seos. | Emulsio
- Puu lahoaa. | Palaminen
- Aineen pH on 4. | Happamuus
- Järvi jäätyy pinnalta eikä pohjasta. | Tiheys
- happo + emäs => suola + vesi | Neuraloituminen
- [Image: Varoitusmerkki] | Terveyshaitta
- [Image: Molekyyli] | Alkoholi
- Loppukesällä ilmojen viiletessä merivesi on lämpimämpää kuin pienen järven vesi. | Ominaislämpökapasiteetti
- Saattaa aiheuttaa uneliaisuutta ja huimausta. | H336
- Hakeudu lääkäriin. | P313
- [Image: Molekyyli] | Hiilivety
Also offered: Emäksisyys; Välitön myrkyllisyys; Krooninen terveyshaitta; Lämpötilakerroin; Yhteyttäminen; Etikkahappo

Q: Match the reaction description and name.
- These reactions produce oxides. | Compustion
- These reactions produce salt and water. | Neutralization
- Electrons are given and received in these reactions. | Oxidation-reduction reactions
Also offered: pH reactions

Q: The copper roof can be nailed with iron nails.
- Tosi
- Epätosi
A: Epätosi

Q: Iron atoms are reduced when they rust.
- Tosi
- Epätosi
A: Epätosi

Q: In the following reaction, zinc is oxidized:

\(Zn \rightarrow Zn^{2+} + 2 e^- \)
- Tosi
- Epätosi
A: Tosi

Q: Oxygen is released in cellular respiration.
- Tosi (No, carbon dioxide is released.)
- Epätosi
A: Epätosi

Q: Oxygen is released in photosynthesis.
- Tosi
- Epätosi
A: Tosi

Q: Check the reaction equations so that both sides have the same number of atoms and correct the coefficients.

[...] \( Zn + \) [...] \(O_2 \)  \(\rightarrow\) [...] \( ZnO \)

[...] \( Mg + \) [...] \(O_2 \)  \(\rightarrow\) [...] \( MgO \)

[...] \( CH_4 + \) [...] \(O_2 \)  \(\rightarrow\) [...] \( CO_2 + \)  [...] \(H_2 O\)
A: 2; 1; 2; 2; 1; 2; 1; 2; 1; 2

What is rust and how can it be prevented/slowed down?

Q: Choose the statements from the list where a chemical reaction takes place.
- Water freezes in the winter. (It is just a phase change.)
- Sugar dissolves in coffee. (Dissolving is not a chemical reaction.)
- Fireworks explodes.
- Candle is burning.
- Milk sours.
- Ethanol evaporates.
- Iron rusts.
A: Fireworks explodes.; Candle is burning.; Milk sours.; Iron rusts.

Notice! For all questions, round your answer to two decimal places. Also include the unit, if required.

Q: Which of the following statements are true? Select one or more.
- O K is equal to -273 ºC.
- In the sauna, you are comfortable sitting on the wooden seat but not touching any metallic objects because the metallic objects are much hotter.
- When ice melts, energy is released.
- All energy is created in the sun.
- Energy is needed to transfer heat from cooler to hotter temperature.
- Nuclear power, peat and wind power are renewable sources of energy.
- Energy is the ability to do work.
- Heat is a form of energy.
- Energy from the sun is stored by plants and converted to other forms of energy for example by burning wood or eating potatoes.
- The efficiency of a machine is 55 %. This means that almost half of the energy used by the machine is wasted.
A: O K is equal to -273 ºC.; Energy is needed to transfer heat from cooler to hotter temperature.; Energy is the ability to do work.; Heat is a form of energy.; Energy from the sun is stored by plants and converted to other forms of energy for example by burning wood or eating potatoes.; The efficiency of a machine is 55 %. This means that almost half of the energy used by the machine is wasted.

1.

Explain what is meant by the amount of substance.

1. Explain, what is meant by the amount of substance.

2. There are 10 grams of table salt (NaCl) in the glass. What is the amount of substance?

Q: Name the parts of an atom in the picture.

A = [...]

B = [...]

C = [...]

[Image: name parts]

What element is in the picture? [...]
A: electron / Electron; proton / Proton; nucleus / Nucleus; sodium / Na

Q: Open the safety data sheet of LV hand disinfectant and find the asked informations from it.

Safety data sheet

a) Use of the substance: [...]

b) Hazard symbols: [...]

c) Hazard statements in order: [...]

d) Flash point: [...] ^oC

e) What is the first aid measure if the chemical is inhaled: [...]
A: For repetitive disinfection of hands; flammable and health hazard; H225, H319; 12; Move to fresh air
Gap 2 offers: flammable; environmental hazard; oxidizing; serious health hazard; gas under pressure; health hazard; explosive; acute toxicity

Q: Substance is called  [...], when pH is less than 7.

Substance is called [...], when pH is over 7.

If pH is 7, then the substance is  [...].

Soaps are usually [...].

Soda drinks are usually [...].
A: Acid; Alkali; Neutral; Basic; Acidic

Q: Name the following hazard symbols.

[Image]

[...]

[Image]

[...]

[Image]

[...]

[Image]

[...]
A: explosive / Explosive; oxidising / oxidizing / Oxidising; corrosive / Corrosive; acute toxicity / Acute toxicity / toxic%50%

Q: What is the molar mass of ammonium chloride? Use the periodic table.

The chemical formula is \(NH_4Cl\).

Remember to write the unit and you don't need to round the answer.
A: 53,489 g/mol / 53.489 g/mol / 53,489g/mol / 53.489g/mol
Partly right: 53,489 (50%); 53,5 (50%)

Q: What is the amount of substance? There is {mar} g of ethanol \(C_2H_6O\)?

$$n=\frac{m}{M}$$
A: {mar}/46.069 (formula; values not in the backup's text)

Q: 2 liters of hand rinse solution is prepared. For that, mix {c} ml of concentrate with water. What is the concentration of the hand rinse solution in percentages by volume?

Round the answer to the nearest tenth with give a unit. E.g. 12.3%.
A: (({c}/1000)/2)*100 (formula; values not in the backup's text)

[Image]