In what direction does heat flow?
A. Heat flows back and forth between objects.

B. Heat flows from an object of higher temperature to an object of
lower temperature.
C. Heat flows from an object of lower temperature to an object of
higher temperature,
D. Heat flows only if objects are at the same temperature,

Answer:

Paraffin combustion produces more energy per gram than ethanol fuel but paraffin fuel has a larger carbon footprint

Explanation:

Paraffin is also known by the standard chemical name alkane with a chemical formula for a paraffin given as  follows;

CₙH₂ₙ₊₂

While gasoline, also known as petrol, consists of light weight alkanes and alkenes

The heat of combustion of gasoline is about 47.3 kJ/g

The combustion of gasoline is incomplete as presented in the following equation

[tex]C_x H_y+ O_2 +N_2 \rightarrow CO_2 + H_2O + CO + HC + NO_x[/tex]

Example of complete combustion of octane, however, is given as follows;

2C₈H₁₈ + 25O₂ → 16CO₂ + 18H₂O  + Energy    

The source of paraffin is from petroleum

Ethanol fuel can be produced by the fermentation of Sugar

The heat of combustion of ethanol = 1366.91 kJ/mol = 29.664 kJ/g.

2CH₃OH + 3O₂  → 2CO₂ + 4H₂O  + Energy                              

Answer:

Patterns in nature are visible regularities of form found in the natural world. These patterns recur in different contexts and can sometimes be modelled mathematically. Natural patterns include symmetries, trees, spirals, meanders, waves, foams, tessellations, cracks and stripes

Explanation:

Answer:

C.

Recycling aluminum cans saves a considerable amount of energy; it also reduces carbon dioxide emissions and the amount of waste headed into landfills. Collecting your cans for recycling is an important step you can take to help the environment.

Answer:

H₂O

Explanation:

H₂O is the chemical formula of water.

Water is regarded as a "universal solvent". The reason behind this is the property of the water. Water is a solvent that can dissolve a variety of substances in itself. Any other liquid cannot dissolve the number of substances that the solvent water can. The reason behind being the universal solvent is the chemical composition and physical characteristics of water.

Answer: What does a duck eat most often?

Option D is the best scientific question

Hope it helps....

What does a duck eat most often, this question is the best scientific question. A scientific question is one that may be directly investigated using an experiment or set of data in the field of science.

A scientific question is one that may generate a hypothesis and assist in determining the cause of an observation. A sound scientific hypothesis must be verifiable and quantifiable. You can do an experiment to get the solution.

Then there are the inquiries that seek explanations for why anything exists, why something is the way it is, or why we are here. These inquiries constitute the first type. These are what some refer to as "ultimate" questions that go beyond the purview of science.

Thus, option D is correct.

To learn more about scientific question, follow the link;

https://brainly.com/question/1683754

#SPJ6

The structural adaptation of the A. cristatus lizard that helps them in the water is a flattened tail, option B. The flattened tail acts as a powerful swimming paddle that enables the lizard to move through the water with ease.

Structural adaptation refers to physical changes in an organism's body structure that enable it to better survive and thrive in its environment. These adaptations can be anatomical, physiological, or behavioral, and are typically the result of natural selection over many generations.

The flattened tail  adaptation is especially useful for the A. cristatus lizard, which is a semi-aquatic species that spends much of its time in and around water.

While strong claws may help the lizard climb trees or navigate rough terrain on land, they are not specifically adapted for aquatic environments.

Large size and fishing in herds are also not adaptations that aid in swimming or other aquatic activities. Hence, option B is correct.

Find more on cristatus lizard:

https://brainly.com/question/16443859

#SPJ3

Answer:

B, the charge is +1

Explanation:

science

Answer:

B. +1

Explanation:

Answer:

The final temperature of the water is 28.98 degree Celsius.

Explanation:

It is given that,

Mass of sample of water, m = 52 grams

Initial temperature, [tex]T_i=10^{\circ}C[/tex]

Heat absorbed, [tex]Q=4,130\ J[/tex]

The specific heat of water is [tex]4.184\ J/(g^{\circ} C)[/tex]

We need to find the final temperature of the water. The heat absorbed is given by the formula as follows :

[tex]Q=mc\Delta T\\\\Q=mc(T_f-T_i)\\\\T_f=\dfrac{Q}{mc}+T_i\\\\T_f=\dfrac{4130}{52\times 4.184 }+10\\\\T_f=28.98^{\circ} C[/tex]

So, the final temperature of the water is 28.98 degree Celsius.

Answer:

29 degree Celsius

Explanation:

If anyone confused this is the choices:

11 °C

19 °C

29 °C

Estimate 28.98 to 29 for the answer

Answer:rising temperature

Explanation:

V is directly propotional to the temperature and inversly to the pressure.

Answer:

this is cause due to increase of pressure

Answer:

208 g/mol and 87 g/mol

Explanation:

Number of protons = 82

Atomic mass = 126 + 82 = 208 g/mol

For ^{87}Sr

Number of neutrons = 49

Number of protons = 38

Atomic Mass = 49 + 38 = 87 g/mol

Answer 208 and 87

Explanation:

D. Salt and water

Explanation:

Acid + Alkali -> Salt + water

Explanation:

the following correct choices would include:

Option C. Dissociate in water .

Option D. Electrolytes .

Option F. Are a product of a neutralizing reaction.

Sodium chloride is the scientific name for basic salt, table salt, or halite. In which is a synthetic compound with the equation NaCl.

Hope I could help! :)

Answer: It’s good that there are protests but the looting and destruction needs to stop

Explanation:

Answer:

Ag is the oxidizing agent

Explanation:

oxidizing agent in the following equation?

Al (s) + 3 Ag+ (aq) = Al+3 (aq) + 3 Ag (s)

Left side

Al = 1

Ag = 3

Right Side

Al = 1

Ag = 3

So it's balanced already good.

Define

oxidizing agent = An oxidizing agent is the substance that gains electrons and is reduced in a chemical reaction.

Al is the reducing agent.

Ag is the oxidizing agent

Answer:

I interpret the answers as being nonmetallic and metallic.

Explanation:

Nonmetals are in groups 14 - 18. Electronegativity is referred to as the want to attract electrons to an atom. Noble gases (group 18) have eight valence electrons in their outer subshells and are therefore atomically stable. Elements with only 7 valence electrons are very electronegative because they desire to obtain an electron to reach stability more than a group 2 element would (they are more likely to drop electrons by giving away in order to reach atomic stability of a group 18 element). This coincides with electron configuration, which is a very lengthy topic to cover. You can conduct more research if you would need it.

Answer:

the distribution of their components

Explanation:

Homogeneous mixtures = cannot be separated

Heterogeneous mixtures = can be separated

You can identify these mixtures by looking at the distributions of their particles. Therefore, the third answer is correct.

Answer:

H + ions are for acids

there is one. Essentially a base is a chemical which will react with an acid to form a salt and water only. An alkali is a water-soluble base.  Insoluble bases, which are not called alkalis, are all metal oxides and insoluble metal hydroxides.

HCl(aq) + Na(OH)(aq) → H2O + NaCl this is what i know

hey i remembered y metals conduct electricity

Metals contain free moving delocalized electrons. When electric voltage is applied, an electric field within the metal triggers the movement of the electrons, making them shift from one end to another end of the conductor. Electrons will move toward the positive side. Metal is a good conduction of heat.

Explanation:

those are what i know hope it helps

Answer:

H + ions

alkalis are also bases but the difference between them is,alkalis are soluble in water but the bases doesn't. Bases are substances that react with acids and neutralise them.

Potassium hydroxide, KOH.

When an acid and a base are placed together, they react to neutralize the acid and base properties, producing a salt. The H(+) cation of the acid combines with the OH(-) anion of the base to form water.

the process or result of oxidizing or being oxidized.

Hydrogen

Metals are excellent conductors because the atoms in a metal form a matrix through which their outer electrons can move freely. Instead of orbiting their respective metal atoms, they form a "sea" of electrons that surrounds the positively charged atomic nuclei of the interacting metal ions .

Positive diagnosis for a lactulose SIBO breath test – typically positive if the patient produces approximately 20 ppm of hydrogen and/or methane within the first 60–90 minutes (indicates bacteria in the small intestine), followed by a much larger peak (colonic response). This is also known as a biphasic pattern.

Answer: Covalent Double Bond

Explanation:

Butter is made from saturated fat, which is made from hydrocarbon molecules. A hydrocarbon is a compound containing only carbon and hydrogen bonds. Both of those are covalent bonds.

Answer:

heat energy

Explanation:

water in the sun begins to get hot

Answer:

D. heat energy

Explanation:

This energy is in the form of heat. Evaporation occurs when the liquid is heated. For example, as the sun warms the water in a puddle, the puddle slowly shrinks. Water appears to be vanishing, but it eventually comes through the air as a fluid called a water vapor.

hope this helped!

Answer:

Increasing the temperature increases reaction rates because of the disproportionately large increase in the number of high energy collisions. It is only these collisions (possessing at least the activation energy for the reaction) which result in a reaction

Explanation:

Answer:

Similar chemical properties

Answer:

The correct option is B

b) sewage

Explanation:

Sewage reffers to domestic or municipal wastewater,it is a type of wastewater which is released to the environment by a community of people.It could be industrial effluents, or stormwater from streets. It can be identified by the amount of chemical and toxic constituents, the status of bacteria present.

There is release of sewage into streams and rivers around the world today even in an untreated form, as a result of these the respiration as well as the available Oxygen is consumed because of the organic carbon present in the untreated sewage which makes the river toxic and get people infected with diseases if consumed.

Sewage is made up of different harmful microbes, human can contact diseases from these microorganisms when bathing with the water or make use of it to cook.

Answer:

rises to an altitude where the pressure is 27.5 and the temperature is 10°C, its volume there is.

The reaction between sodium and gold III chloride is a single replacement since sodium is ahead of gold in the electrochemical series

A chemical reaction has to do with an interaction between two or more reactants to yield products.

Now we know that the reaction between sodium and gold III chloride is a single replacement since sodium is ahead of gold in the electrochemical series hence; 3Na + AuCl3 ----->3NaCl + Au

Learn more about reaction: https://brainly.com/question/1388366

Answer: B. Chemists are constantly learning more about what makes chemicals dangerous.

Explanation: The safety of chemicals still remains of utmost importance as chemist haven't relented in their strive and curiousness at knowing the compounds, mixtures and elements which makes chemicals dangerous in other to minimize or mitigate the risk of exposure to this chemicals during usage. Chemicals are things we cannot do without as they constitute a lot to the human race in terms of Energy and health. Due to this immense contribution, the safety of chemicals will remain of great priority to chemists.

Answer:

I'm pretty sure the answer is B

Explanation:

Because when a chemical reaction takes place the substances atoms rearrange and turn into a different substance.