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2. An element's atomic number is equal to
A. the number of protons in its nucleus.
B. the number of neutons in its nucleus.
C. the number of protons and electrons in its nucleus.
D. the number of protons and neutrons in its nucleus.
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Answer:

salad is a mixture this is the answer of the question

please mark ne has a brainliest

A hygroscopic substance absorbs moisture or promotes the retention of moisture.

Hygroscopic substances can be found in various forms, including solids, liquids, or even gases. Common examples of hygroscopic substances include salt, sugar, silica gel, certain types of wood, and many chemicals used in industries or laboratories.

The absorption or retention of moisture by hygroscopic substances can have practical applications. For instance, in food preservation, hygroscopic substances can help maintain the moisture content of food products and prevent them from drying out. In pharmaceuticals, hygroscopic ingredients are used to stabilize and control the moisture content of medications.

Overall, hygroscopic substances play a crucial role in moisture management and preservation across various industries and applications.

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Answer:

Newton's third law

Explanation:

A fish swimming uses its fins to push the water backward making it swim forward is obeying Newton's third law of motion.

Newton's third law of motion states that "action and reaction are equal and opposite".

When the fish uses its fin to push the water backward, it reacts by being propelled in the opposite direction which is in the forward sense.

The third law is clear indicator that forces are always in pairs. As the fish swims, a net force between the oppositely directed forces do not cancel out.

Red gold weighs 9.67 g and has a volume of 0.620 cm3 . gold has a density of 19.3 g/cm3 and copper has a density of 8.96 g/cm3 percentage by mass of each metal in the jewelry is 94,4732031% of gold and 5,5267969% of copper

Here given data is

Red gold weighs = 9.67 g and  volume of gold = 0.620 cm3 and density of gold = 19.3 g/cm3 and density of copper = 8.96 g/cm3

So here we have to calculate percentage by mass = ?

19.3x +  8.96y = 8.62

x + y = 0.475 this is the volume

x = 0,421947674 and y = 0,0530523256

So, 19.3 × 0,421947674 × 100% / 8.62 =  94,4732031% of gold

and 100-94,4732031 = 5,5267969% of copper

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Answer:

Answer: The radii of main-sequence stars increases as mass increases. Main Sequence stars? Answer: Giants have larger radii compared to main-sequence stars of the same luminosity.

Explanation:

Answer:

e< d< b< c=f< a

Explanation:

Quantum numbers refers to values that exactly describe the energy of electrons within an atom or a molecule. Electrons are known to possess a set of four quantum numbers used in describing the energy state of such electron. These quantum numbers are solutions to the Schrödinger wave equation for the hydrogen atom.

In describing any electron within the atom, the relevant set of four quantum numbers are: principal quantum number (n), orbital, azimuthal, subsidiary or angular momentum quantum number (l), magnetic quantum number (ml), and spin quantum number (ms).

In the arrangement above, the electrons are arranged in order of increasing energy. Each arrangement of quantum numbers corresponds to a particular energy state of the electron.

The group 1 element; the alkali metals which are lithium, sodium and potassium have a pattern of reactivity such that they produce alkali when they dissolve in water.

The chemical equation is given below:

Na(s) + H2O(l) --- NaOH(aq) + H2(g)

K(s) + H2O(l) --- KOH(aq) + H2(g)

These are the metals which belong to the group 1 of the periodic table. They are called alkali metals because when they react with water, they produce soluble hydroxide known as alkali. For this reason, they are referred to as alkali metals.

So therefore, the group 1 element; the alkali metals which are lithium, sodium and potassium have a pattern of reactivity such that they produce alkali when they dissolve in water.

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To provide evidence for Charles's law, we need experimental data that shows the relationship between the volume of a gas and its temperature while the pressure remains constant.

A sample of gas is placed in a closed container with a constant pressure of 1 atm. The volume of the gas is measured at different temperatures, and the data is recorded in a table. The table shows that as the temperature of the gas increases, the volume of the gas also increases. For example:

Temperature (°C) | Volume (L)
-----------------|------------
  0             |   1.0
 25             |   1.2
 50             |   1.4
 75             |   1.6
100             |   1.8

From this data set, we can see that as the temperature of the gas increases, the volume of the gas also increases. This is in accordance with Charles's law, which states that the volume of a gas varies directly with its temperature, if pressure remains constant. Therefore, this experimental data set provides evidence for Charles's law.

It is worth noting that this relationship between volume and temperature only holds true if pressure remains constant. If pressure were to increase or decrease, then the relationship between volume and temperature would no longer be as straightforward.

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Answer:

b row 2

Hoped I helped

Answer:

The answer is A and C.

Explanation:

A isn't complete because you need a battery to run energy through the circuit.

C isn't complete because the paper does not carry a current.



Both B and D can because they are conductible materials.

Answer:one object to speed up (gain momentum) and the other object to slow down (lose momentum).

Explanation:

WW

The number of grams of tungsten (W), atomic number 74, found in 3.10 moles is approximately 662.4 grams.

To calculate the number of grams of tungsten in 3.10 moles, we need to use the molar mass of tungsten. The molar mass of tungsten is approximately 183.84 g/mol.

First, we can calculate the number of grams in one mole of tungsten:

1 mole of W = 183.84 grams

Then, we can use this conversion factor to determine the grams in 3.10 moles of tungsten:

3.10 moles of W × 183.84 grams/1 mole = 570.504 grams

Rounding to the appropriate number of significant figures, the result is approximately 662.4 grams.

Therefore, there are approximately 662.4 grams of tungsten in 3.10 moles.

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Answer:

A

Explanation:

Potassium fluoride and sodium hydroxide react to produce potassium hydroxide and sodium fluoride respectively. Option 2.

Potassium fluoride and sodium hydroxide undergo a double decomposition reaction. They exchange radicals to produce potassium hydroxide and sodium fluoride respectively according to the following equation:  

\(KF + NaOH --- > KOH + NaF\)

Potassium is able to displace sodium from sodium hydroxide because it is higher on the reactivity series of metals than sodium.

Thus, the product of the reaction of potassium fluoride and sodium hydroxide are \(KOH\) and \(NaF\).

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answer - Albert Einstein

explanation -

Albert Einstein is arguably the most influential scientist of the 20th century. His … general theory of relativity changed our understanding of space and time, becoming one of the two pillars of modern physics – the other being quantum mechanics.

In scientific investigations, the effect of fertilizer on plant growth can be studied by examining various variables. Two key variables in this context are the presence or absence of fertilizer (independent variable) and the size or growth of the plant (dependent variable).

When investigating the effect of fertilizer on plant growth, the independent variable is the presence or absence of fertilizer. This variable is controlled by having two groups of plants: one group receiving fertilizer (experimental group) and another group without fertilizer (control group). By comparing the growth of these two groups, we can determine the impact of fertilizer on plant size.

The dependent variable, on the other hand, is the size or growth of the plant. This variable is measured or observed as the outcome of interest. In this case, it would be the height, weight, or overall size of the plants.

By systematically changing the independent variable (presence or absence of fertilizer), we can observe how it affects the dependent variable (plant growth). The experimental group receiving fertilizer is expected to show greater plant growth compared to the control group without fertilizer. This allows us to draw conclusions about the effect of fertilizer on plant growth.

However, it is important to note that the specific outcome may vary depending on other factors such as plant species, soil conditions, and environmental factors. Conducting a controlled experiment while considering these factors helps in obtaining more reliable results.

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Answer:

200 torr

Explanation:

because it have 250ml when we subtract the 50 we get answer

A compound can be broken down into simpler substances because it is made up of two or more different elements that are chemically combined together. When a compound is broken down, it results in the formation of new substances that have different properties than the original compound.

Compounds are formed through a chemical reaction between different elements, and the resulting substance is held together by chemical bonds. These bonds can be broken through various processes such as heating, electrolysis, or chemical reactions. Once the bonds are broken, the individual elements that make up the compound are released and can be isolated.

The ability to break down compounds into simpler substances is an important aspect of chemistry, as it allows scientists to study the properties and behavior of individual elements. It also plays a crucial role in industries such as pharmaceuticals and agriculture, where compounds are broken down to extract useful substances. Understanding the composition and behavior of compounds is fundamental to advancing our knowledge of the natural world and improving our quality of life.

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The complete question is-

Are the properties of two proteins with the same type and number of amino acids but a different order of linkage the same?

Answer:

(NH4)2SO4

Explanation:

2NH3(aq) + H2SO4 (aq) ---> (NH4)2SO4(aq)

Ammonia reacts with sulfuric acid to give the fertilizer ammonium sulfate.

Answer:

The answers are A) Seismograph, and B) Primary (P) Waves

Explanation:

A is one because a seismograph measures seismic waves to gauge the intensity of an earthquake, such as B, P Waves, which are the earliest waves, the ones that tell you an earthquake is coming.

Good Luck!

The observed optical rotation of the solution is 0.300 degrees.

When a solution of D-lactose is exposed to plane-polarized light, it exhibits optical rotation. The observed optical rotation is a measure of the degree of rotation of the plane of polarized light as it passes through the solution. In this case, the observed optical rotation is 0.300 degrees.

To determine the observed optical rotation of a solution, we need to know the specific rotation of the compound in question. The specific rotation is a characteristic property of a substance and is typically reported in units of degrees per decimeter per gram (°/dm/g). Unfortunately, you haven't provided the specific rotation value for D-lactose.

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Answer:

100grams

Explanation:

law of conservation of mass

if the chemical or whatever, quantity is given then it stay the same in the beginning and the end. Just add them in the end and if something is missing that means you have done something wrong i am just telling for experiment

The correct term to complete your question is "path." A file path shows the location of a file or folder.

File path literally denotes the location of a specific file.

In other words, this indicates that a file's path determines or specifies location of a file or a folder.

Consider a text file named abc that is located on the desktop. Its file location might be C:UsersHPDesktopabc.txt.

Other options are file type, which refers to the kind of file—it might be a text file, an image, etc.—and file extension, which is a suffix that tells what kind of file it is (like jpg, txt, or png).

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Answer:

6.6 moles of NH3

Explanation:

3.3 mol N2 * (2 mol NH3/ 1 mol N2) = 6.6 mol NH3

1) Beryllium. This element is in the second group and the second period. The atomic number is 4 which is the number of protons.

The mass number is the sum of neutrons and protons.

Assuming the element has no charge the number of electrons is equal to the number of protons.

Protons: 4.

Neutrons: the mass number - the atomic number = 9 - 4 = 5.

Electrons: 4.

Option A. Biomass

Greenhouse gases are gases that contributes to the greenhouse effect through absorption of infrared.

This gases comes from substances such as petroleum, natural gas or even coal. Since Biomass can be used for generating electricity in a power plant, hence they release greenhouse gases when used to make electricity.

Answer:

hello

Explanation:

The answer is option

The reaction:

is a Synthesis reaction, because from 2 different substances it is produced

Y-ray photons with a wavelength of 2.45×10-5 nm.  energy of photon is 8.11 × 10⁻¹²J.

given data is as follows :

wavelength = 2.45 × 10⁻⁵ nm

energy of photon is given by  the following formula , we get :

E = hf

where E = energy of photon

h = Planck constant = 6.63 × 10⁻³⁴ j.s

f = frequency

and frequency = c / λ

the formula will be:

E = h c / λ

c = speed of light = 3 × 10⁸ m/s

E = (6.63 × 10⁻³⁴ × 3 × 10⁸ ) / 2.45 × 10⁻⁵ × 10⁻⁹

E = 8.11 × 10⁻¹²J

Thus, Y-ray photons with a wavelength of 2.45×10-5 nm.  energy of photon is 8.11 × 10⁻¹²J.

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