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3 years ago

PLS HELP ME ASAP!!!!!

Chemistry

1 answer:

vichka [17]3 years ago

7 0

Independent variable- Sally's hair

Dependent variable- The shininess of Sally's hair

Control- The Shampoo

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Periodic trends are shaped by interactions between what?

11111nata11111 [884]

Answer:

There are three factors that help in the prediction of the trends in the periodic table: number of protons in the nucleus, number of energy levels, and the shielding effect. The atomic radii increase from top to the bottom in any group. The atomic radii decrease from left to right across a period.

Explanation:

Major periodic trends include atomic radius, ionization energy, electron affinity, electronegativity, valency and metallic character. These trends exist because of the similar electronic configuration of the elements within their respective groups or periods and because of the periodic nature of the elements.

8 0

1 year ago

Determine the empirical formula of kevlar, used in making bullet proof vests, is 70.6% c, 4.2% h, 11.8% n and 13.4% o.

Likurg_2 [28]

Assuming a basis of 100 g of Kevlar, therefore the masses are:

C = 70.6 g

H = 4.2 g

N = 11.8 g

O = 13.4 g

We know the molar masses are:

C = 12.01, H = 1.008, N = 14.01, O = 16.00

Calculating for the moles per element:

C = 70.6 / 12.01 = 5.88 mol

H = 4.2 / 1.008 = 4.17 mol

N = 11.8 / 14.01 = 0.84 mol

O = 13.4 / 16 = 0.84 mol

To get the empirical formula, the next step is to divide everything by the smallest moles = 0.84. So:

C = 7

H = 5

N = 1

O = 1

Hence the empirical formula is:

C7H5NO

3 0

4 years ago

When an experimenter draws a conclusion that he assumes will apply to all situations set up similarly to his test situation, eve

frosja888 [35]

Before making any observations, deductive reasoning relies on the formulation of a hypothesis and its subsequent substantiation.

<h3>Deductive reasoning: What does it mean?</h3>

Since the sentence states that "he assumes will apply to all instances," he is suggesting something before to carrying out any observation, which is the foundation of deductive reasoning.

A conclusion in deductive reasoning is based on the agreement of several premises that are typically taken to be true. Sometimes, top-down logic is used to describe deductive reasoning. Making logical assumptions is the foundation of deductive reasoning, which then bases a conclusion on those assumptions.

The primary distinction between inductive and deductive thinking is that the former tries to develop a hypothesis, whilst the latter aims to test an existing theory. From specific observations, inductive reasoning proceeds to

To learn more about deductive reasoning refer to

brainly.com/question/3478823

#SPJ4

5 0

1 year ago

The heat capacity of water is 1cal degree'g1 (1 calorie per degree centigrade, per gram). You are given 1 gallon of water at 25

sdas [7]

Answer:

The heat needed to boil 1 gallon of water is 81,490.62 Joules.

Explanation:

$Q=mc\Delta T$

Where:

Q = heat absorbed or heat lost

c = specific heat of substance

m = Mass of the substance

ΔT = change in temperature of the substance

We have :

Volume of water = V = 1 gal = 4546.09 mL

Density of water , d= 1 g/mL

mass of water = m = d × V = 1g/mL × 4546.09 mL = 4546.09 g

Specific heat of water = c = 1 Cal/g°C

ΔT = 100°C - 25°C = 75 °C

9 (boiling pint of water is 100°C)

Heat absorbed by the water to make it boil:

$Q= 4546.09 g\times 1 Cal/g^oC\times 75^oC=340,956.75 Cal$

1 calorie = 4.184 J

$Q=\frac{340,956.75}{4.184} J = 81,490.62 J$

The heat needed to boil 1 gallon of water is 81,490.62 Joules.

5 0

3 years ago

Explain the need of the term avarage atomic mass

vodomira [7]

Answer:

The average atomic mass of an element is the sum of the masses of its isotopes, each multiplied by its natural abundance (the decimal associated with percent of atoms of that element that are of a given isotopе). An element does not have an absolute atomic mass.

Hope this helps :)

4 0

3 years ago