Facts, figures, and other evidence learned through observation are call

Answer:

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Explanation:

Answer:

protons 30

neutrons 35

electrons 30

Answer: 4,250 x 10 - 6

Explanation: ok so we have a decimal number, what you do with that is

[tex]4.250 x 10^{3}[/tex] = 4.250 x 1,000 = 4,250 now you can just move the decimal every time without that equation but its better safe. I'm pretty sure that's how they want it, because its not expanded or word.

Answer:

70%

Explanation:

Just substract 100 % - 30%

Answer:  The data are not arranged in a useful pattern.  I arranged them as best I could and made a graph in Excel for demonstration.

Explanation:  The data are plotted with mass on the x axis and volume on the y.  Add a key to identify the top line as CU and the bottom as Al.

The density of Cu is 8.9 g/ml and 2.70 for Al.  

The mass of copper increases by 17.8 grams going from 6 to 8 ml.  (8.9 g/ml)*(2 ml) = 17.8 grams.

Copper is more dense. c The graph shows that for the same volumes, copper has the higher mass.

Explanation:

The water eventually is released to the atmosphere as vapor via the plant's stomata — tiny, closeable, pore-like structures on the surfaces of leaves. Overall, this uptake of water at the roots, transport of water through plant tissues, and release of vapor by leaves is known as transpiration

Through transpiration, plants move enormous quantities of water from the soil to the air.

Transpiration is the process by which plants lose water vapor through small openings called stomata in their leaves. Water is taken up by the roots from the soil and transported to the leaves through the xylem vessels. Once in the leaves, water evaporates from the surface of the cells and exits through the stomata into the surrounding air.

This continuous loss of water through transpiration creates a pulling force, known as the transpiration pull or tension, which helps to draw water upward from the roots. As water molecules evaporate from the leaves, more water is pulled up through the plant's vascular system to replace the lost water.

Transpiration not only aids in the transport of water and nutrients from the roots to the rest of the plant, but it also plays a crucial role in regulating the plant's temperature, maintaining cell turgidity, and facilitating the movement of minerals within the plant.

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Answer:  Exothermic

Explanation:  The energy of the reactants is leass than that of the products.  Conservation of energy means that the excess is given off, or exothermic.

Answer:

It's B. The molecules in the system have more kinetic energy than a solid.

Answer:

If an atom, ion, or molecule is at the lowest possible energy level, it and its electrons are said to be in the ground state. If it is at a higher energy level, it is said to be excited, or any electrons that have higher energy than the ground state are excited

Explanation:

pls mark brainliest

Answer: Isotope-1: Hydrogen (H)

Isotope-2: Deuterium (H)

Explanation: The periodic table shows that the smallest element in hydrogen (H), at an average atomic weight of 1.008. Hydrogen-1 has one proton, one electron, and no neutrons, which adds to 1 AMU. Hyrogen-2 is an isotope of hydrogen that contains 1 neutron in addition to the proton, bringing the mass to 2 AMU. It is only at 0.0156% abundance on Earth and is given the name Deuterium, sometimes refered to as "heavy water" when incorporated into a water molecule. A third isotope has 2 neutrons, and is called Tritium.

Answer:

A. > digestive and circulation

B. > digestive and excertory

C. > nervous and muscluar

D.> digestive and circulation

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Answer:

Explanation:

positive and negative

Answer:

105

Explanation:

1 nickel = 5 cents

5.25 dollars x 100 cents

= 525 cents

525 cents / 5 cents

= 105 nickels

Answer:

Copper is less reactive than hydrogen, so copper (Cu) is produced at the negative electrode. The half equation is: Cu2+ + 2e- → Cu

The hydroxide ion is more reactive than the sulphate ion, therefore this forms water (H2O) and oxygen at the positive electrode.

Answer:

3.8775 kJ

Explanation:

The formula is Q=mcdeltat

We know m (mass) is 150, c (specific heat) is 0.235, and delta t (change in temperature) is 135-25=110

Plug that in and solve for Q

150*0.235*110=3877.5 J

The problem is that this is still in joules so we have to convert to kilojoules

3877.5 J * 1 kJ/1000 J = 3.8775 kJ

Answer:

Collecting gas over waterWhen collecting oxygen gas and calculating its partial pressure by displacing water from an inverted bottle, the presence of water vapor in the collecting bottle must be accounted for; this is easily accomplished using Dalton’s Law of Partial Pressures.

Answer:

d. a row of elements

Explanation:

Elements that are in the same group, have same number of electrons and make up a column in a periodic table.

[tex].[/tex]

The phrase which best describes a period on the periodic table is; a row of elements.

The elements in the periodic table are divided into rows and columns. The rows are called the periods while the columns are called the groups.

This means that a period is best described as a row of elements from the foregoing.

Therefore, the correct answer is option D: a row of elements.

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Answer: I believe you may have meant "ionization energy?" Yes, for a neutral element this is a measure of the energy required to remove a valence electron.

Explanation: See above.

By definition, The energy required for the complete removal of 1 mol of electrons from 1 mole of gaseous atoms or ions is called Ionization energy. For a neutral element this energy is a measure of how easily the element forms an ion with a charge.

The electrons are attracted to the nucleus and it is necessary to provide energy to start them.

Ionization energy is the energy required to remove an electron from a gaseous atom, isolated and in a ground state. The electrons in the last shell, which are the weakest attracted to the nucleus, are always lost. In this way the neutral atom becomes a gaseous cation (positively charged ion).

The further away the electron is from the nucleus, the easier it is to remove it, that is, the less energy is needed.

Finally:

The energy required for the complete removal of 1 mol of electrons from 1 mole of gaseous atoms or ions is called Ionization energy. For a neutral element this energy is a measure of how easily the element forms an ion with a charge.

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Answer:

Molecules of compounds have atoms of two or more different elements. For example, water (H2O) has three atoms, two hydrogen (H) atoms and one oxygen (O) atom.

Explanation:

Explanation:

The 2019 water crisis in Chennai has made us realize the importance of saving water more than ever. Water, as we all know, is a finite resource without which our planet would be a barren wasteland. Today with our increasing population it would be logical to say that our water consumption has also increased. And with increasing demand and lesser supply, water scarcity arises. Our ancestors who had foreseen the potential dangers of water scarcity had developed methods to conserve water that was suited for the varied terrain of the Tamil-speaking kingdoms.

Traditional Rainwater Conservation methods of Tamil Nadu

Eri

There are no perennial rivers in Tamil Nadu except the Thamirabharani River which flows through Thirunelveli district. And so, several hundred years ago a simple system was devised to utilize the rainwater to the fullest. An Eri or tank system is one of the oldest forms of water conservation systems in India. Many Eris are still in use in Tamil Nadu and play an active role in irrigation. They act as water reservoirs and flood control systems. They prevent soil erosion, recharge groundwater, and prevent wastage of runoff water during heavy rainfall.

Kudimaramathu

Kudimaramathu is one of the old traditional practice of stakeholders participating in the maintenance and management of irrigation systems. During earlier days, citizens of a village used to actively participate in maintaining the water bodies of their village by deepening and widening the lakes and ponds and restoring the water bodies back to their original form. The silt, rich in nutrients, collected in the process would be used by the farmers themselves in their field. A sense of collective ownership ensured the continued survival of the water bodies.

Answer:I dunno

Explanation:it is the best thing I ever said in this app

Answer:

it will come answer 21 write

Answer:

chemical change

I hope it's helps you

Answer:

The empirical formula is the formula with a minimum whole number ratio of the constituent atoms present in a molecule. While the molecular formula has the actual number of atoms of various elements present in the molecule of the substance.

Empirical formula is C₃H₄O₃

Molecular formula is C₆H₈O₆

[tex]C_{x}[/tex][tex]H_{y} O_{z}[/tex] + O₂ ⟶ xCO₂ + [tex]\frac{y}{z} H_{2} O[/tex]

From online sources, molar mass of CO₂ = 44 g/mol

number of moles of CO₂ = 12.81/44 = 0.291m mol

Mass of carbon in it is; C = 12 × 0.291 = 3.492 mg

molar mass of water = 18 g/mol

number of moles of water in it = 3.5/18 = 0.194m mol

Hydrogen has 2 nos in water and so;

number of moles of hydrogen = 2 × 0.194 = 0.388m mol

Mass of hydrogen = 1 × 0.388 = 0.388 mg

Oxygen mass = 8.544 - (3.492 + 0.388) = 4.664 mg

Similarly, moles of oxygen that has molar mass of 16 is;

no of moles of oxygen = 4.664/16 = 0.2915m mol

Ratio of C:H:O is; 0.291:0.388;0.2915

Simplifying this gives us the empirical formula ratio as;

3:4:3

Thus;

Empirical formula is C₃H₄O₃

We are told that the molar mass of the compound is 176.1 g/mol.

Thus;

Molecular formula is; (176.1/88)C₃H₄O₃ = C₆H₈O₆

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Answer:

C

Explanation:

A Van de Graaff generator is an electrostatic generator which uses a moving belt to accumulate electric charge on a hollow metal globe on the top of an insulated column, creating very high electric potentials. It produces very high voltage direct current (DC) electricity at low current levels

Answer: The answer is ‘a neutral atom gained 2 electrons’

Explanation: Because electrons are negatively charged and adding 2 extra would make the ion negatively charged by 2

Answer:

The answer to all the quiz questions are

Explanation:

1. Which statement describes the number of protons in each atom of an element?

*The number of protons is given by the atomic number, which increases by one moving from left to right across each row of the periodic table.*

2. An element has an atomic number of 16. An ion of this element has a 2– charge. How was the ion formed?

*A neutral atom gained 2 electrons.*

3. Rubidium has an atomic number of 37 and a mass number of 85. How many protons, neutrons, and electrons does an ion of rubidium with a 1+ charge have?

*37 protons, 48 neutrons, and 36 electrons*

4. There are three stable forms of neon: neon-20, neon-21, and neon-22. Which statement is true?

*Their atomic masses differ.*

5. Beryllium has an atomic number of 4. How many neutrons does the isotope beryllium-9 have?

*5*

Lets Form bonds

Al=2,8,3

Lets Write actual configuration or modern

[tex]\\ \sf\longmapsto 1s^22s^22p^63s^3[/tex]

Let's write configuration

[tex]\\ \sf\longmapsto 1s^22s^22p^63s^23p^5[/tex]

Now Criss cross valency (Refer to attachment)

We get

[tex]\\ \sf\longmapsto AlCl_3[/tex]

Answer:

A reaction in which heat is absorbed by reactant molecules and energy of products become more than reactants is known as an endothermic reaction

Answer:

Explanation:

[tex]\tt{ \green{P} \orange{s} \red{y} \blue{x} \pink{c} \purple{h} \green{i} e}[/tex]