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3 years ago

Look at the two thermometers.

Chemistry

2 answers:

salantis [7]3 years ago

3 0

Answer:

Thermometer A, because it measures accurately to the tenths digit.

hichkok12 [17]3 years ago

3 0

Answer : The correct option is, Thermometer A, because it measures accurately to the tenths digit.

Explanation :

Accuracy : It is defined as the closeness of a measured value to a standard or known value.

For Example : If the mass of a substance is 50 kg and one person weighed 48 kg and another person weighed 55 kg. Then, the weight measured by first person is more accurate.

Precision : It is defined as the closeness of two or more measurements to each other.

For Example : If you weigh a given substance five times and you get 1.8 kg each time. Then the measurement is said to be precise.

The level of precision is determined by the maximum number of decimal places.

As we are given that the measurement of the temperature of a liquid at $41.4^oC$ .

From the given thermometer we conclude that, the thermometer A is more appropriate than the thermometer B because in thermometer A there are 10 divisions between the two temperature and the smallest division is, 0.1.

So, the temperature of liquid will be, $41.0^oC+0.4=41.4^oC$

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Calculate the molality of a solution formed by adding 6.30 g NH4CL to 15.7 g of water

babymother [125]

Answer:

Molality = 7.5 mol/kg

Explanation:

Given data:

Mass of NH₄Cl = 6.30 g

Mass of water = 15.7 g (15.7/1000 =0.016 kg)

Molality = ?

Solution:

Formula of molality:

Molality = Moles of solute / mass of solvent in gram

Now we will first calculate the number of moles of solute( NH₄Cl )

Number of moles = mass/ molar mass

Molar mass of NH₄Cl = 53.491 g/mol

Number of moles = 6.30 g/ 53.491 g/mol

Number of moles = 0.12 mol

Now we will calculate the molality.

Molality = Moles of solute / mass of solvent in gram

Molality = 0.12 mol / 0.016 kg

Molality = 7.5 m

or (m=mol/kg)

Molality = 7.5 mol/kg

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3 years ago

How many grams of O2(g) are needed to completely burn 15.6 g of C3H8(g)?

alexdok [17]

15.6gC3H8*44.1gC3H8*32gO2=11.32

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3 years ago

Validate how valence electrons determine the chemical reactivity of an element: give 2 examples of elements with high reactivity

Ostrovityanka [42]

Nitrogen is more reactive than oxygen and oxygen than chlorine

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3 years ago

1. In order to make 1 salad it requires 1 head of lettuce, two tomatoes and three carrots. What would be the coefficients for th

pogonyaev

Answer:

3 salad = 3 lettuce + 6 tomatoes + 9 three carrots

Coefficients: 3, 6, 9

Explanation:

1 salad = 1 lettuce + 2 tomatoes + 3 three carrots

<em>Multiply all the coefficients of 1 salad by 3:</em>

3(1 salad) = 3(1 lettuce + 2 tomatoes + 3 three carrots)

<em>Expand the equation:</em>

3 salad = 3 lettuce + 6 tomatoes + 9 three carrots

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3 years ago

A certain half-reaction has a standard reduction potential -1.33V . An engineer proposes using this half-reaction at the anode o

Paha777 [63]

Answer:

a. -0.63 V

b. No

Explanation:

Step 1: Given data

Standard reduction potential of the anode (E°red): -1.33 V

Minimum standard cell potential (E°cell): 0.70 V

Step 2: Calculate the required standard reduction potential of the cathode

The galvanic cell must provide at least 0.70V of electrical power, that is:

E°cell > 0.70 V [1]

We can calculate the standard reduction potential of the cathode (E°cat) using the following expression.

E°cell = E°cat - E°an [2]

If we combine [1] and [2], we get,

E°cat - E°an > 0.70 V

E°cat > 0.70 V + E°an

E°cat > 0.70 V + (-1.33 V)

E°cat > -0.63 V

The minimum E°cat is -0.63 V and there is no maximum E°cat.

3 0

3 years ago