Which solution when mixed with a drop of bromthymol blue will cause the indicator to change from blue to yellow 1) 0.1 M HCl. 2) 0.1 M CH3OH. 3) 0.1 M NH3. 4) 0.1 M NaOH

Answers

Answer 1

Answer:

The solution that when mixed with a drop of bromthymol blue will change the indicator to yellow is A. 0.1 M HCl.

What is an indicator?

An indicator simply means a substance that has measurable and observable characteristics that is important to depict an acidic or alkaline substance.

In this case, the solution that when mixed with a drop of bromthymol blue will change the indicator to yellow is 0.1 M HCl.

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Answer 2

Answer: 1) is the answer because the only way to turn it from blue to yellow is to mix it with an acidic solution.

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C3H8 + 5O2 -> 3CO2 + 4H2OAccording to this equation, which ratio of oxygen to propane is correct?

1- 5 grams O2 / 1 gram C3H8
2- 5 moles O2 / 1 mole C3H8
3- 10 grams O2 / 11 grams C3H8
4- 10 moles O2 / 11 moles C3H8

Answers

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 5 moles oxygen / 1 mole propane. The correct option is option C among all the given options.

What is mole?

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

The balanced equation for the given chemical reaction can be given as

C $_3$ H $_8$ + 5O $_2$ $\rightarrow$ 3CO $_2$ + 4H $_2$ O

Stoichiometry represents the number of number of moles of reactant and products. The mole ratio between oxygen and propane is 5:1. the correct option isoption 2.

Therefore, 5 moles oxygen / 1 mole propane. The correct option is option C among all the given options.

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The answer is number 2

OSHA standards appear in the ___________ and are then broken down into ____________.

Answers

OSHA standards appear in the Code of Federal Regulations (CFR) and was then broken down into two parts. It contains standards to ensure a comfortable and high quality research tools like the databases. These standards are to be strictly monitored to ensure the safety of workers.

The answer is

OSHA standards appear in the Code of Federal Regulations (CFR) and was then broken down into two parts.

The explanation:

OSHA standards are rules that describe the methods that employers must use to protect their employees from hazards. There are OSHA standards for Construction work, Maritime operations, and General Industry, which is the set that applies to most worksites. These standards limit the amount of hazardous chemicals workers can be exposed to, require the use of certain safe practices and equipment, and require employers to monitor hazards and keep records of workplace injuries and illnesses

It contains standards to ensure a comfortable and high quality research tools like the databases. These standards are to be strictly monitored to ensure the safety of workers.

neon is a noble gases a very stable it does not readily combined with other elements which category does neon belong to

Answers

This is a nonmetal because gases cannot be metals

Humans are dependent on _______ for their food supply.a.waterb.biomassc.fossil fuelsd.timber

Answers

Answer: b. Biomass

Humans are dependent upon biomass for their food supply. Biomass is the organic matter that is produced by the living organisms during their life cycle. The biomass is transferred from one organism to other organism in a food chain when one organism is consumed by other organism in order to obtain food and energy. Human beings are hetrotrophic organisms, which means they are dependent upon plants and animals for their food and energy requirement. The food is a form of biomass, which is being transferred among the living beings in the food chain.

The answer is biomass

How many moles are in 68.5 liters of oxygen gas at STP?

Answers

We can solve this problem when we use the conditions of a gas at standard temperature and pressure. It has been established that at STP where the temperature is 0 degrees Celsius and the pressure is 101.325 kPa, the volume of 1 mole of gas is 22.4 L. We will use this data for the calculations.

68.5 L ( 1 mol O2 / 22.4 L O2 ) = 3.06 mol O2

Explanation:

It is known that at STP, there are 22.4 L present in one mole of a substance.

Therefore, in 68.5 liters there will be 1 mol divided by 22.4 L times 68.5 L.

Mathematically, $68.5 L * (1 mol O_(2))/(22.4 L)$

= 3.05 mol

Hence, we can conclude that there are 3.05 moles present in 68.5 liters of oxygen gas at STP.

The sense of touch is produced by______ within the skin. dermis,muscles,neurons,feelings

Answers

Neurons is the correct answer.

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Write the equation of the chemical reaction of burning glucose (C6H12O6)

Which reaction type? *combination (synthesis) combustion decomposition single replacement double replacement