All categories

3 years ago

What is a scientific model? How is a scientific model helpful to the brain for relaying a scientific

1 answer:

4 0

Answer: A scientific model is a physical and mathematical and conceptual representation of a system of ideas, events or processes.

ANd also for your second question i dont know what you mean?

Explanation:

You might be interested in

Which are factors scientists use to classify orders of soil?

Sergio039 [100]

Answer:

Soils are a function of the five soil-forming factors: climate, organisms, relief, parent material, and time. Each of these factors range on a continuum, so the different soils of the world number in the thousands. Soil scientists recognize 12 major orders of soils.

Explanation:

8 0

3 years ago

John has to hit a bottle with a ball to win a prize. He throws a 0.4 kg ball with a velocity of 18 m/s. It hits a 0.2 kg bottle,

enot [183]

One can solve the problem by using the law of conservation of momentum. The total momentum prior to the collision must be equivalent to the total momentum after the collision, so we have:

m1v1 + m2v2 = m1v1 + m2v2

Here, m1 is 0.4 Kg that is the mass of the ball, u1 is 18 m/s that is the initial velocity of the ball, m2 is 0.2 Kg that is the mass of the bottle, and u2 is 0 that is the initial velocity of the bottle.

v1 is the final velocity of the ball, which is to be determined, and v2 is 25 m/s that is the final velocity of the bottle.

Substituting and rearranging the equation, one can find the final velocity of the ball:

v1 = m1u1 - m2v2 / m1 = (0.4 kg) (18 m/s) - (0.2 Kg) (25 m/s) / 0.4 Kg = 5.5 m/s.

5 0

3 years ago

Read 2 more answers

Pay if forward movie questions worksheet

stellarik [79]

Are you answering a worksheet or searching for one?

If you're searching for one here are some decent ones

1: https://www.eslprintables.com/cinema_and_television/movies/film_questionnaire_on_Pay_it__148601/

https://www.eslprintables.com/cinema_and_television/movies/Film_Pay_if_Forward_164829/

5 0

4 years ago

Nicotine, a component of tobacco, is composed of c, h, and n. A 2.625-mg sample of nicotine was combusted, producing 7.1210 mg o

Vikki [24]

The mass sample of nicotine combusted = 2.625 mg (given)

Mass of $CO_2$ produced = 7.1210 mg (given)

Mass of $H_2O$ produced = 2.042 mg (given)

Molar mass of $CO_2$ = 44 g/mol

Molar mass of $H_2O$ = 18 g/mol

Percentage of Carbon = $\frac{12 g}{44 g/mol}\times \frac{7.120 mg of CO_2}{2.625 mg sample}\times 100 = 74.04$ %

Percentage of hydrogen = $\frac{2 g}{18 g/mol}\times \frac{2.04 mg of H_2O}{2.625 mg sample}\times 100 = 8.62$ %

Now, for percentage of nitrogen = $100 - (74.04+8.62) = 17.34$ %

Calculating the moles of each element:

$Number of moles = \frac{given mass}{Molar mass}$

For $C$

$\frac{74.04 g}{12 g/mol} = 6.17 mol$

For $H$

$\frac{8.62 g}{1 g/mol} = 8.62 mol$

For $N$

$\frac{17.34 g}{14 g/mol} = 1.24 mol$

Dividing with the smallest mole value to calculate the molar ratio of each element:

$C_{\frac{6.17}{1.24}} = C_{4.9} = C_5$

$H_{\frac{8.62}{1.24}} = H_{6.9} = H_7$

$N_{\frac{1.24}{1.24}} = N_1$

Hence, the empirical formula for nicotine is $C_5H_7N$ .

8 0

3 years ago

If 42.7 of 0.208 M hydrochloric acid are needed to completely neutralize a solution of calcium hydroxide, how many grams of calc

Montano1993 [528]

Answer:

0.329 g

Explanation:

In the context of this problem, we have a chemical reaction between hydrochloric acid and calcium hydroxide. HCl is the acid here and calcium hydroxide is the base. Hence, we have an acid-base reaction, also known as neutralization reaction.

In a neutralization reaction, water is produced as a product, as well as a salt that we obtain after we exchange the cations: calcium bonds to chloride and hydrogen bonds to hydroxide (the latter is the formation of water). This means we also produce calcium chloride as a product. The overall reaction represents this as:

$Ca(OH)_2(aq)+2 HCl (aq)\rightarrow CaCl_2 (aq)+2 H_2O (l)$

Firslt of all, we wish to find the number of moles of HCl present. Having molarity and volume, this is done by applying the molarity formula. It states that molarity is equal to the rate between moles and volume:

$c_{HCl}=\frac{n_{HCl}}{V_{HCl}}$