PLEASE HELP!!!!!!!!!!!

Answer:I need it

Explanation: I have the same quision in my chemistry exam but i dont have the answer

Answer:

An element is a substance that cannot be chemically decomposed into simpler substances. An atom is the smallest particle of an element that can take part in chemical reactions. A compound is a substance formed from two or more elements chemically joined (bonded) together.

Explanation:

Answer:

I think this is the right answer, I researched this. I am not sure if this is the right answer.

Lava flows rarely kill people because they move slowly enough for people to get out of their way. If magma is thick and sticky, gases cannot escape easily. Pressure builds up until the gases escape violently and explode. ... Explosive volcanic eruptions can be dangerous and deadly.

Explanation:

Answer:

A series circuit is defined as the circuit in which a number of resistances are connected one after the other.. In a series circuit, the flow of current follows a single path.

A parallel circuit is defined as the circuit in which a number of resistances are linked across each other in such a way that one terminal of each resistance is connected to form a junction point while the remaining end is also connected to form another point.

You havent added the diagram so i cant tell you the answer, but i added the definition of each circuit, see if that helps!

Yeast is a substance which contributes to beer brewing by producing ethanol during alcohol fermentation.

This a process in which  carbohydrate is converted into an acid or alcohol. A common fungus used by brewing companies in fermentation processes is referred to as Yeast.

It converts Sugar to the following products:

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Answer:

oxygen has six shared electrons

Covalent molecules are the group of atoms that shares a covalent bond. Ammonia is a molecule that shares three pairs or six electrons to form a covalent bond.

Covalent bonds are the intermolecular bonds that mutually involve the sharing of electrons between the two or more atoms of the molecules. In ammonia three pairs of electrons are in a covalent bond.

In an ammonia molecule nitrogen have five electrons in its outer shells and hydrogen have one electron each. When three hydrogen shares their electrons with nitrogen to make a covalent bond the octet of the nitrogen atom is completed.

Therefore, covalent molecule Q is ammonia.

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Carbon atoms is made up of a nucleus of neutrons and six protons which is surrounded by six electrons.

This refers to a chemical element which has an atomic number of 6 and is denoted as C. It is the major constituent of all organic substances which are present in nature.

Examples include carbohydrate, hydrocarbons etc and usually acts as the central atom in reactions.

It is made up of  neutrons, six protons and six electrons thereby making it the most appropriate choice.

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The menstrual cycle is regulated by hormones. Luteinizing hormone and follicle-stimulating hormone, which are produced by the pituitary gland, promote ovulation and stimulate the ovaries to produce estrogen and progesterone.

Answer:

answer=217.047pa

Explanation:

we apply the Gay Lussac's law "at constant volume the pressure of a fixed mass of a gas is directly proportional to kelvin temperature"

p1/t1=p2/t2

hence we can modify the equation

p2=t2*p1/t1

=210*308/298

=217.047pa

Answer:

A. Gametes are formed by meiosis and are haploid, while body cells are formed by mitosis and are diploid.

Explanation:

Meiosis is a type of cell division that produces four haploid daughter cells (gametes) from one cell, while mitosis produces two diploid daughter cells (i.e., somatic cells). In both cases, the DNA is replicated during interphase of the cell cycle

a. consistency because she's making notes about how well each sample sticks together.

Answer:

A. consistency

Explanation:

I took the test

Answer:

1.18 atm

Explanation:

We need to use the Ideal Gal Law for this question:

 PV = nRT, where P is the pressure, V the volume, n the moles, R the gas constant, and T the temperature in Kelvins.

I'll choose a gas constant that has units compatible with the given conditions:

 R = 0.08206 (L*atm)/(K*mol)

P = (8.5 moles)*(0.08206 (L*atm)/(K*mol))*(365.1K)

Make sure all the units cancel except atmospheres.

P = 1.18 atm

Answer:

5 simple characteristics of bacteria-

Single-Celled.

Absent Organelles.

Plasma Membrane.

Cell Walls.

DNA.

Explanation:

Answer:

b

Explanation:

percentage yield = mass of what is produced ÷ theoretical yield x 100

percentage yield = 15.6÷17=0.9176470588235

x 100 = 91.76

this rounds to 91.8%, so the answer is b. :)

Answer:

A. True

Explanation:

it is possible to identify a hair as originating from a particular body area, the regions of the body that are primarily used in forensic comparisons are the head and pubic areas.

Forensic = the application of scientific methods and techniques to natters investigation by a court of law.

During an investigation, hair samples are taken from either the head or pubic area of a victim. This statement is true.

A thorough search for facts, particularly those that are obscure or need to be sorted out in a complicated situation, is known as an investigation. An investigation's main objective is often to ascertain how or why something occurred. Investigations are frequently formal, official processes.

Establishing pertinent data to support or refute claims of fraud and corruption is the goal of an inquiry.

It takes subjective thought to develop justifiable justifications for beliefs. It is conceivably the most significant line of thought an investigator will follow. It is a way of thinking that is founded on the facts, information, and evidence the investigator has gathered throughout their inquiry.

Thus, During an investigation, hair samples are taken from either the head or pubic area of a victim.

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Answer:

The DNA is cut using special chemicals called restriction enzymes,.

DNA ligase are used to insert genes and other pieces of DNA into plasmids.

Answer:

wat

Explanation:

The first law of thermodynamics characterises the two types of energy transfer, as heat and as thermodynamic. The final internal (thermal) energy of the system is 1,500 J.

The energy present in a system itself for conducting reactions is called internal energy.

Given,

According to the first law of thermodynamics:

[tex]\rm Q = \Delta U + W[/tex]

Substituting values in the above equation:

[tex]\begin{aligned}\rm Q &= \rm U_{2} - U_{1} + W\\\\\rm U_{2} &= \rm Q - W + U_{1}\\\\\rm U_{2} &= 700 - 400 + 1200\\\\&= 1500 \;\rm J\end{aligned}[/tex]

Therefore, option D. 1500 J is the final energy.

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Answer: The answer would be: 1500 J

Explanation:

took the quiz

Answer:

Forest fire

Explanation:

Mark me as brainliest

Environmental change that is considered short term is forest fire.

Short-term environmental change is the environmental change that occurs quickly and affects organisms. Forest fires are an example of a short- term environmental change.

Short-term changes include changes in seasonal patterns, unseasonal rainfall, changes in the life cycle of insects and animals, and so on. Long term changes examples are melting of glaciers or a rise in levels of water bodies which may cover islands close to sea level.

El Niño and La Niña are two examples of short-term climate changes lasting one to a few years. In an El Niño, the trade winds reverse direction, as do the equatorial surface currents. This causes warm water to pool off of South America and stop upwelling. A La Niña is like normal conditions only more so.

Therefore, Environmental change that is considered short term is forest fire.

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They must also possess a fixed crystalline structure (spatial arrangement of atoms and ions).

Minerals are those naturally occurring substances that are required for proper growth of living organisms.

It is found both on earth and in food substances such as calcium, magnesium, iron.

Minerals are known to have spatial arrangement of atoms and ions. Which means the ions and atoms are not randomly arranged.

Therefore, minerals are all naturally occurring solid substances with a definable chemical composition because it possess a fixed crystalline structure.

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Answer:

Calcium has an Atomic number of 20 and Atomic mass of 40.078 u

Hope this helps!

In this experiment, errors may be due to the presence of impurities of the splashing of solutions used in the laboratory analysis.

Experiments are often used by scientists to determine cause and effect relationships. These experiments are often not free from errors. These errors affect the quality of the results from the experiments.

In this experiment, errors may be due to the presence of impurities of the splashing of solutions used in the laboratory analysis.

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The IUPAC name  of the oxyacid formed from chlorite is chlorous acid.

All oxyacids have the acidic hydrogen bound to an oxygen atom, so bond strength (length) is not a factor, as it is with binary nonmetal hydrides. Rather, the electronegativity of the central atom and the number of oxygen atoms determine oxyacid acidity. For oxyacids with the same central atom, acid strength increases with the number of oxygen atoms attached to it. With the same number of oxygen atoms attached to it, acid strength increases with increasing electronegativity of the central atom.

Compared to the salts of their deprotonated forms (a class of compounds known as the oxyanions), oxyacids are generally less stable, and many of them only exist formally as hypothetical species, or only exist in solution and cannot be isolated in pure form.

Thus, the IUPAC name  of the oxyacid formed from chlorite is chlorous acid.

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Answer:

Mass of oxygen required = 19.5 moles × 16 g/mol = 312 g.

Explanation:

Answer:
The answers are:

1. Gas particles act like tiny, solid spheres.
2. Gas particles are in constant, random motion.
4. Collisions are elastic, there is no energy lost as the particle hits the sides of the container.

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According to the Kinetic Molecular Theory, the statements that are true of the gas particles are:

The Kinetic Molecular Theory actually states that the particles of gas are in motion constantly and their collisions are perfectly elastic.

This theory is actually used to give explanations for Boyle's and Charles' laws.

According to the Kinetic Molecular Theory, the collisions of the gas are elastic and are in constant motion.

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Answer:

Potassium (K)

Strontium (Sr)

Magnesium (Mg)

Explanation:

The cation in Potassium Chloride (KCl) is Potassium (K) because of Potassium’s placement on the periodic table it has a charge of +1 while Chlorine has a charge of -1, making it the anion with a 1:1 ratio.

The cation in Strontium Chloride (SrCl2) is Stronitum (Sr) because of Strontium’s placement on the periodic table it has a charge of +2 while Chlorine has a charge of -1, making it the anion but since there are two Chlorines present in the formula, a 1:2 ratio.

The cation in Magnesium Chloride (MgCl2) is Magnesium (Mg) because of Magnesium’s placement on the periodic table it has a charge of +2 while Chlorine has a charge of -1, making it the anion but since there are two Chlorines present in the formula, a 1:2 ratio.

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Artificial reproduction technologies enables individuals unable to conceive to be able to conceive and give birth.

Although ethical issues are raised, artificial reproduction technologies are important for people who cannot naturally conceive if the technology is used within the allowed ethics.

Artificial reproduction technologies refers to the technologies available which enables individuals unable to conceive to be able to conceive and give birth.

Some artificial reproduction technologies includes;

The ethical implications is that humans now can choose between which babies to be born and which are not, thereby playing God.

Though, many ethical issues arise, humans should be allowed to use this technologies in order to help those who are unable to give birth to be able to do so.

Without these technologies, it would be impossible for people who can not give birth to do so, which could cause a lot of mental and physical anxiety.

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Answer:

313.15K

Explanation:

According to the Celsius to Kelvin formula, by adding 273.15, the temperature in Celsius can be converted to the temperature in Kelvin. Thus, 0°C = 0 + 273.15 = 273.15 K.

so to convert 40°c to kelvin

40+273.15

= 313.15K