Which of these describes “Al”?

atomic mass

chemical symbol

atomic number

none of the above

Answer:

It is a type of radiant energy that's invisible to human eyes but that we can feel as heat.

Answer:

Transpiration is the correct answer mark me brainliest

Answer:

I think it's false but not sure

The atoms of platinum and silver are identical. This statement is false.

Platinum is a chemical element which is represented by the symbol Pt. Its atomic number is 78. It is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal.

The elements silver and platinum have the same properties in terms of ductility, malleability, and conductivity of heat and electricity.Platinum is more ductile than gold, silver or copper.

Both metals silver and platinum appear silver. They have gray undertones, unlike white gold which has a warmer, yellow undertone, instead platinum is much brighter and shinier and silver is a duller, gray appearance.

Thus, The atoms of platinum and silver are identical. This statement is false.

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Answer: 7

Explanation:

Answer:

Hg(NO3)2 + Na2CO3 --> 2NaNO3 + HgCO3

Answer:

Sound Travels

Explanation:

Sound waves can travel, and that makes it so that even though Marco is in a different room, he can hear the music. Depending how loud the music is and how thick the walls car, the sound can travel through the walls.

Answer:

No it is not a good conductor

Explanation:

Krypton is classified as a gas and nonmetal. Like many nonmetals and gases, krypton is an insulator, so it is a relatively poor conductor of heat and electricity.

Answer:

the anwser is landforms can be created by erosion

Explanation:

This problem is providing information about the initial mass of mercury (II) oxide (10.00 g) which is able to produce liquid mercury (8.00 g) and gaseous oxygen and asks for the resulting mass of the latter, which turns out to be 0.65 g after doing the corresponding calculations.

Initially, it is given a mass of 10.00 g of the oxide and 1.35 g are left which means that the following mass is consumed:

[tex]m_{HgO}^{consumed}=10.00g-1.35 g=8.65 g[/tex]

Now, since 8.00 grams of liquid mercury are collected, it is possible to calculate the grams of oxygen that were produced, by considering the law of conservation of mass, which states that the mass of the products equal that of the reactants as it is nor destroyed nor created. In such a way, the mass of oxygen turns out to be:

[tex]m_{O_2}=8.65g-8.00g=0.65g[/tex]

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Answer:

Thermal food sterilization and pasteurization are the most widespread preservation technologies to extend food shelf life by inactivating microorganisms and enzymes that can deteriorate foodstuffs.

Explanation:

The process requires constant attention.

The equipment that it requires are costly.

Keeping moisture in food is difficult because of low moisture contents in the machine.

The orientation of the poles of the magnet on the cars and the large

magnet are like poles.

The correct responses are;

First question

Second question:

Third question:

Fourth question:

Reasons:

Potential energy is the energy an object has due to its location.

Energy is a product of force and distance, and therefore, if the force,

experienced by the object increase, the potential energy of the object

increases.

The strength of a magnetic field, B, is given by the formula;

[tex]\displaystyle B = \frac{\mu_0 \cdot I}{2 \cdot \pi \cdot d}[/tex]

Where;

B = The magnetic field strength

I = Current

d = The distance from the source of the magnet

μ₀ = The permeability of free space = 4·π × 10⁻⁷ T m/A

Therefore, the strength of the magnet is higher closer to the source.

First question

In a magnet, like poles push each other back, and given that the poles of the magnet adjacent to each other are like poles, to get the largest increase in she should move the cars towards the large magnet.

Second question:

The reason why the movement will result in the largest increase in potential energy is because like polls repel each other and the strength of a magnetic field increases closer to the magnet

Third question:

The magnetic force that will act on the roller coaster car moved towards the large magnet, pushes the car in the opposite direction.

Fourth question:

The green cart should be moved from point D to point C to get the largest potential energy

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Answer:

Explanation:

They play a very important part. The geometry is not a straight line. It is an angle over 90 which means that the molecule has the same general shape as a boomerang. The two hydrogens and the 2 lone electron pairs try to get away as far as possible from each other. The actual shape results in a tetrahedron shape. But the two hydrogens and 1 oxygen actually look like the aforementioned boomerang.

Answer:

A

Explanation:

now I'm not sure, but considering negative feedback allows the systems to self stabilize that would be the best option.

PLEASE NOTE THAT THIS IS A EDUCATED GUESS.

When particles move fast enough, these forces can no longer keep particles together.

Recall that the particles of a substance are in constant random motion. Hence, when more energy is added to the system, the particles within the system will have greater motion, and the temperature will increase.

The forces that keep molecules together in a particular state of matter are electrostatic forces. When particles move fast enough, these forces can no longer keep particles together.

It is common to use the analogy of an elastic material to represent the bonding between atoms in molecules. However, this analogy is not apt in a phase change because, for a phase change from liquid to gas, the bonds break completely and particles can move independently of each other.

We know that the average kinetic energy of the molecules of a substance depends on the temperature of the body. Therefore, a sample of liquid benzene at 80ºC and a sample of gaseous benzene at 80ºC will have the same average kinetic energy as benzene molecules.

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Answer:

The vertical columns (groups) of the periodic table are arranged such that all its elements have the same number of valence electrons. All elements within a certain group thus share similar properties.

hope this helps

Explanation:

Each column is called a group. The elements in each group have the same number of electrons in the outer orbital. Those outer electrons are also called valence electrons. They are the electrons involved in chemical bonds with other elements.

An H atom is made up of a nucleus with a +1 charge, as well as a single electron. Therefore, the only positively charged ion possible has charge +1.

I hope this helps!

Answer:

Carbon dioxide, water, and sunlight

Explanation:

Answer: The answers aplicable would be

1) The greater magnitude of force, the faster the acceleration.

2) Acceleration is caused by unbalanced forces.

[tex]2\text{Cr(NO}_3\text{)}_3} + 3\text{CuCl}_2 \longrightarrow 2\text{CrCl}_3 + 3\text{Cu(NO}_3\text{)}_2[/tex]

Answer:

Na2SO4

2×23 + 32 + 4×16

46 + 32 +64

=142g

Answer:

Temperature

Explanation:

This is because quantitative data include numerical values for example 10 degrees Celsius. However the others are qualitative data because the research can be described but not with numbers like your appearance is very nice.

Hope this helps :P

Answer:

Quantitative data is the type of data whose value is measured in the form of numbers or counts, with a unique numerical value associated with each data set. Also known as numerical data, quantitative data further describes numeric variables (e.g. How many? How often? How much?)

Explanation:

so its temp

When particles in a solid or liquid move faster they move slightly further

apart and is referred to as Elastic collision

Liquids and gases possess more kinetic energy than solids which is why

there is movement of its atoms in a system. Gas have the highest kinetic

energy and solids have the lowest. When the atoms move ,they collide with

one another which pushes the particles further apart.

The atoms in liquid and gas exhibit vibrational(rotational) motion which brings about movement and collision of the particles.

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Answer:

Chlorine-35 and chlorine-37 are not different elements because an atom of chlorine-35 and an atom of chlorine-37 each contain the same number of protons. The number of protons an atom has, also known as the atom's atomic number, determines which element it is. All atoms which contain 17 protons are called chlorine atoms. Adding or removing a proton from an atom's nucleus changes that atom's atomic number and creates a different element.

Chlorine-35 and chlorine-37 are both isotopes of the element chlorine. The number after the name 'chlorine' is called the mass number. The mass number is a tally of the number of protons and the number of neutrons in an atom's nucleus. Since all atoms of chlorine contain 17 protons, chlorine-35 and chlorine-37 differ in the number of neutrons each one has. An atom of chlorine-35 contains 18 neutrons (17 protons + 18 neutrons = 35 particles in the nucleus) while an atom of chlorine-37 contains 20 neutrons (17 protons + 20 neutrons = 37 particles in the nucleus).

Adding or removing a neutron from an atom's nucleus creates isotopes of a particular element. Why does changing the number of protons in an atom change which element that atom is but changing the number of neutrons doesn't? Protons carry a positive charge. Each proton in an atom's nucleus must be balanced with a negatively charged electron in one of the 'shells' outside the nucleus. The number of electrons in an atom's outer shell determines the atom's chemical properties. Adding or removing protons changes the number and arrangement of electrons in the outer shell which changes how that atom reacts with other atoms. Neutrons don't change things greatly because they do not carry an electrical charge. Neutrons can be added or removed from an atom and the electrons around the atom really don't care that much.

Answer:

Explanation:

Amplitude, or the size of the wave height, affects the loudness. Larger the amplitude, the louder the volume. Period, or the time it takes for the wave to complete one round, determines the pitch. Shorter period (or higher frequency) means higher pitch.

Answer:

The number of electrons is the atomic number

Answer:

[tex]\boxed {\boxed {\sf 5.6 \ L \ O_2}}[/tex]

Explanation:

We are asked to find the volume of 0.25 moles of oxygen gas.

At standard temperature and pressure or STP, one mole of any gas has a volume of 22.4 liters.

We want to convert 0.25 moles of oxygen gas or O₂ to liters. We will use dimensional analysis, so we must set up a conversion factor.

[tex]\frac {22.4 \ L \ O_2}{1 \ mol \ O_2}[/tex]

We are converting 0.25 moles of oxygen gas, so we multiply the conversion factor by this value.

[tex]0.25 \ mol \ O_2 *\frac {22.4 \ L \ O_2}{1 \ mol \ O_2}[/tex]

The units of moles of oxygen gas cancel.

[tex]0.25 *\frac {22.4 \ L \ O_2}{1 }}[/tex]

[tex]0.25 * 22.4 \ L \ O_2[/tex]

[tex]5.6 \ L \ O_2[/tex]

0.25 moles of oxygen gas occupy 5.6 liters at standard temperature and pressure.

Answer:

h and o

Explanation:

because both are non metals