CHEMISTRY MIDDLE SCHOOL

Which compounds are classified as Arrhenius acids?(1) HCl and NaOH
(2) HNO3 and NaCl
(3) NH3 and H2CO3
(4) HBr and H2SO4

Answers

Answer 1
Answer:

Answer:The correct answer is option 4.

Explanation:

Arrhenius acids are those compounds which gives H^+ ions when dissolved in their aqueous solution.

HA(aq)\rightarrow H^++A^-

Arrhenius bases are those compounds which gives OH^- ions when dissolved in their aqueous solution.

BOH(aq)\rightarrow OH^-+B^+

HBr \& H_2SO_4 are Arrhenius acids because they form H^+ions in their respective aqueous solution.

HBr(aq)\rightarrow H^++Br^-

H_2SO_4(aq)\rightarrow 2H^++SO_(4)^(2-)

Hence, the correct answer is option 4.
Answer 2
Answer: (4) HBr i H2SO4...........

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How can friction be helpful when riding a bicycle and how can it be harmful

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Friction can be beneficial because it helps stop a bicycle. It could be harmful when their is too much friction because it can burn the wheel. 

How many double bonds are in an alkane?

Answers

None
Alkanes only have single bonds

Final answer:

Alkanes are hydrocarbons with only single bonds between the carbon atoms, therefore, they do not contain any double bonds.

Explanation:

In chemistry, an alkane is a type of hydrocarbon where all of the carbon-carbon bonds are single bonds, meaning they share just one pair of electrons. Double bonds share two pairs of electrons and are typically found in alkenes, a different type of hydrocarbon. Therefore, an alkane does not have any double bonds.

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What happens when you mix table salt with glucose?

Answers

the salt will dissolve with the water but the glucose aka sugar will NOT!

Aside from the responses you will get when you break up glucose in water, which are for the most part reversible when you solidify the glucose, and the responses when you disintegrate salt in water (arrangement of a water atom "coat" otherwise known as intricate around the sodium particle), there will be no response amongst glucose and salt.

Dissolvability of either compound will be lessened to some degree by the nearness of the other compound. The expansion of salt to an over-soaked glucose arrangement may begin a crystallization procedure, yet any over-immersed sugar arrangements are difficult to solidify. Take a gander at breakfast sirup or nectar for an ordinary occurrance.

In an ionic compound, how does the pattern formed by the ions change as the crystal gets larger?

Answers

Answer:

Explanation:

It is unchanged.                                    

Explanation:

This is an excerpt from my lesson in science:

In an ionic compound, every ion is attracted to ions of opposite charge that surround it. It is attracted to ions above, below, and to all sides. The pattern formed by the ions remains the same no matter what the size of the crystal.

In a single grain of salt, the crystal pattern extends for millions of ions in every direction. Many crystals of ionic compounds are hard and brittle due to the strength of their ionic bonds and the attractions among all the ions.

Hence, it is unchanged.                                      (Brainliest Please and 5 stars)

Answer:

It is unchanged

Explanation: gradpoint

The pattern formed by the ions remains the same no matter what the size of the crystal.

Help!! How many moles of CaCO3 are needed to get 2.35 moles of CaO? What would be my reasoning and evidence?

Answers

Equation

CaCO3 ===> CaO + O2

Solution

If you start with this equation, then the balance numbers (molar ratios) are

  • 1 for the CaCO3
  • 1 for the CaO
  • 1 for the O2

If you want 2.35 moles of CaO then you are going to have to start out with 2.35 moles of CaCO3

Final answer:

In the decomposition of calcium carbonate to form calcium oxide, there is a 1:1 mole ratio. Therefore, to get 2.35 moles of calcium oxide, 2.35 moles of calcium carbonate are required.

Explanation:

To answer this question, you need to consider stoichiometry, which is the study of the relationships or ratios between the amounts of products and reactants in chemical reactions. The balanced chemical equation for the thermal decomposition of calcium carbonate (CaCO3) to form calcium oxide (CaO) and carbon dioxide (CO2) is:

CaCO3(s) → CaO(s) + CO2(g)

This equation tells us that 1 mole of CaCO3 will produce 1 mole of CaO. Therefore, if we need 2.35 moles of CaO, we would need 2.35 moles of CaCO3 because of the 1:1 mole ratio in the chemical reaction.

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How do everyday activities like driving a car and using electricity lead to global warming ?

Answers

Both driving a car and using electricity produce several greenhouse gases which can lead to global warming.Greenhouse gases are gases that, when released into the atmosphere, trap the heat from the sun's energy. Every day the energy from the sun reaches the earth. Some of the energy is reflected back into space and some of the energy is trapped by the earth's atmosphere. Most of the time the energy being trapped by the atmosphere serves to warm up the earth, so that the temperature does not fluctuate dramatically. In this way the atmosphere acts like a greenhouse - trapping the warmth in. One of the ways that electricity is made is by burning fossil fuels, like coal or fuel. When a fuel is burnt, some of the products are: carbon dioxide, carbon monoxide, and water - all of these gases are greenhouse gases. In a similar way driving a car also burns fossil fuels, and this will produce the same gases.Before lots of fossil fuels were burnt the greenhouse gases in the atmosphere would have been moderated by the carbon cycle. However, if we burn excess fossil fuels we are producing excess greenhouse gases. This can cause more heat to be trapped by the atmosphere and therefore the global temperature will start to rise - global warming. hope i helped 

The emission of carbon due to excessive burning of fossil fuels for making electricity, driving cars and other things  
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