All categories

2 years ago

A solar eclipse will last 1 to _____ minutes.

Chemistry

2 answers:

horrorfan [7]2 years ago

8 0

1st qn - B
2nd qn - A
3 is no

stellarik [79]2 years ago

6 0

1st qn - B
2nd qn - A
Last qn - Yes

You might be interested in

A piece of wood has a labeled length value of 63.2 cm. You measure its length three times and record the following data: 63.1 cm

Ulleksa [173]

Percent error (%)= $\frac{\left | Accepted value - Measured value \right |}{Accepted value}\times 100$

Accepted value is true value.

Measured values is calculated value.

In the question given Accepted value (true value) = 63.2 cm

Given Measured(calculated values) = 63.1 cm , 63.0 cm , 63.7 cm

1) Percent error (%) for first measurement.

Accepted value (true value) = 63.2 cm, Measured(calculated values) = 63.1 cm

Percent error (%)= $\frac{\left | Accepted value - Measured value \right |}{Accepted value}\times 100$

$Percent error = \frac{\left | 63.2 - 63.1 \right |}{63.2}\times 100$

$Percent error = \frac{0.1}{63.2}\times 100$

$Percent error = 0.00158\times 100$

Percent error = 0.158 %

2) Percent error (%) for second measurement.

Accepted value (true value) = 63.2 cm, Measured(calculated values) = 63.0 cm

Percent error (%)= $\frac{\left | Accepted value - Measured value \right |}{Accepted value}\times 100$

$Percent error = \frac{\left | 63.2 - 63.0 \right |}{63.2}\times 100$

$Percent error = \frac{0.2}{63.2}\times 100$

$Percent error = 0.00316\times 100$

Percent error = 0.316 %

3) Percent error (%) for third measurement.

Accepted value (true value) = 63.2 cm, Measured(calculated values) = 63.7 cm

Percent error (%)= $\frac{\left | Accepted value - Measured value \right |}{Accepted value}\times 100$

$Percent error = \frac{\left | 63.2 - 63.7 \right |}{63.2}\times 100$

$Percent error = \frac{\left | -0.5 \right |}{63.2}\times 100$

$Percent error = \frac{(0.5)}{63.2}\times 100$

$Percent error = 0.00791\times 100$

Percent error = 0.791 %

Percent error for each measurement is :

63.1 cm = 0.158%

63.0 cm = 0.316%

63.7 cm = 0.791%

7 0

3 years ago

Identify two acids and two bases that you use or come into contact with in an average week. Identify uses for each substance.

skelet666 [1.2K]

Explanation:

Two acids we come into contact with in an average week

Vinegar is an 10% solution of acetic acid $(CH_3COOH)$ in water. Used in salad dressing and while cooking food. It has a sour taste.
Citric acid present in fruits and vegetables like : lemons, orange, tomatoes etc. It is a weak organic acid with sour taste.

Two bases we come into contact with in an average week.

Baking soda ( $NaHCO_3$ ) is used in baking food like: cakes, cookies, breads. Baking soda is one of the ingredient while baking breads and cakes.
Caustic soda (NaOH) is used for preparation of detergents, papers , soaps etc. We use soaps and detergents for washing.

4 0

2 years ago

Read 2 more answers

At what temperature is the substance a heated gas ?

Scrat [10]

Probably, above 100 Degree Celsius.

4 0

2 years ago

Read 2 more answers

Differentiate between Acidic radical and basic radical

Paladinen [302]

Explanation:

Acidic radical

Acid radical is the ion formed after the removal of Hydrogen ion (H+) from an acid. Example: When H2SO4 loses H+ ion, it forms HSO4− which is an acid radical.

Basic radical

The ion formed after the removal of hydroxide ion (OH−) from a base is known as basic radical.

3 0

2 years ago

What is the volume of kristas rock

Elan Coil [88]

Answer:

for what I can see in the picture the volume is 155

Explanation:

7 0

2 years ago

Read 2 more answers