PLEASE HELP ASAPP!!!!!!!!!!!!!!!!!!!!!!!! TIMED TEST!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!A man pushes a box with a force of 75.0 N across a 12.0 m loading dock. How much work did he do on the box? (Use formula W = F x d)

Answer:

In classical theories of gravitation, the changes in a gravitational field propagate. A change in the distribution of energy and momentum of matter results in subsequent alteration, at a distance, of the gravitational field which it produces.

Explanation:

Answer: It tells you if your hyposthesis was incorrect or correct from the data. The data supports this because you tested and got your results correctly which will help you to form a hypothesis.

Explanation:

Answer:

It tells you if your hyposthesis was incorrect or correct from the data. The data supports this because you tested and got your results correctly which will help you to form a hypothesis.

Explanation: its right trust me

Answer:

if we do not have lab rules then something could go wrong like we could die or like what happened right now CORONAVIRUS that is why lab rules are so important to prevent things like this from happening

The change in oxidation number = +1

Reaction 1

Cl₂(aq) + H₂O(I) → H⁺(aq) + Cl⁻(aq) + HClO(aq)

Reaction 2

HClO(aq) + H₂O(I) → H₃O⁺(aq) + ClO⁻(aq)

The change in oxidation number of chlorine :

From Cl₂ to ClO⁻

oxidation number Cl₂=0

oxidation number Cl in ClO⁻

[tex]\tt Cl+(-2)=-1\\\\Cl=+1[/tex]

So the change : +1

Answer:

D.) Cold air is drier because the water molecules are more likely to condense to a liquid.

Explanation:

This was the answer on my course

Answer:

Water

Explanation:

Gas=  0.689/ml x 1000 ml = 680 g

Water= 1/ml x 1000 ml = 1000 g (grater)

1 liter of water would have greater mass than the I liter of gasoline if the density of water is 1.00 grams/milliliters and that of gasoline is approximately 0.68 grams/milliliters.

It can be defined as the mass of any object or body per unit volume of the particular object or body. Generally, it is expressed as in gram per cm³ or kilogram per meter³.

By using the above formula for density

ρ = mass / volume

As given in the problem we have to find which has the greater mass, 1 liter of water or I liter of gasoline if The density of water is 1.00 g/mL and that of gasoline is approximately 0.68 g/mL

1 Litre = 1000 milliliter

1 liter of water = 1000 milliliter

mass of 1 liter of water = density of water ×volume of water

                                     = 1.00 grams/milliliters×1000 milliliter

                                     =1000 grams

Similarly;y for the gasoline ,

1 liter of gasoline = 1000 milliliter

mass of 1 liter of gasoline = density of gasoline ×volume of gasoline

                                          = 0.68 grams/milliliters×1000 milliliter

                                          =680 grams

Thus we calculated that 1 liter of water would have a mass of 1000 grams while the I liter of gasoline has mass of 680 grams.

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Pure substances are substances which are homogenous in nature. They either consists of atoms of 1 kind or molecules of 1 kind. Atoms are seen in elements, where as molecules are seen in compounds like Acids, Bases, etc.

They mostly have fixed properties like boiling and melting points and are uniform in nature. :D

Explanation:

Synthetic fiber or synthetic fibre (in British English; see spelling differences) are fibers made by humans through chemical synthesis, as opposed to natural fibers that are directly derived from living organisms. They are the result of extensive research by scientists to improve upon naturally occurring animal and plant fibers. In general, synthetic fibers are created by extruding fiber-forming materials through spinnerets, forming a fiber. These are called synthetic or artificial fibers. Synthetic fibers are created by a process known as polymerization, which involves combining monomers to make a long chain or polymer. The word polymer comes from a Greek prefix "poly" which means "many" and suffix "mer" which means "single units". (Note: each single unit of a polymer is called a monomer). There are two types of polymerization: linear polymerization and cross-linked polymerization.

Synthetic material are madeup of monomers and long chain of monomers are known as polymers. The process is known as polymerization and the synthetic material are turned as microplastic which takes a long period of time to decompose. By this way the synthetic materials are very harmful for the society.

Synthetic materials are microplastic pollution and madeup up of polymers which is a long chain of polymers and the process is known as polymerization.

The synthetic materials are often converts into microplastic that takes a long period of time  to decompose and they are also responsible for generation of greenhouse gases.The synthetic material which is popularly known is nylon which is very tough to recycle.

Therefore,synthetic material are turned as microplastic which takes a long period of time to decompose. By this way the synthetic materials are very harmful for the society.

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Answer:

D. The change in velocity divided by the time during which the change occurs.

Explanation: I took the quiz on Accelerate and it was correct

Answer:

D. The change in velocity divided by the time during which the change occurs.

Explanation:

Answer: S waves travel through solids or very dense, glassy liquids. P waves travel through solids liquids and gasses

Explanation:

I took the test, hope this helps!!

Answer:

product

Explanation:

Answer:

products

Explanation:

Chromium(II) fluoride is the name given to the substance CrF2. In this compound, fluorine (F) is present as fluoride anion while chromium (Cr) is present in +2 oxidation state.

The compound contains two fluoride ions, as indicated by the number prefix "di-" before the element symbol F. An inorganic substance called chromium(II) fluoride crystallizes into a solid. It has a crystal structure that mirrors its atomic arrangement and is composed of fluoride anions and chromium cations. Chromium(II) fluoride is useful in many different industries. It serves as a catalyst in some chemical reactions and as a precursor in the manufacture of other chromium compounds.

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Answer:

Adiroak is rhe answere

Answer:

C

Explanation:

Hope This Helps :)

Answer:

C. a group of scientists studying plastic products

Explanation:

Answer:

No, it is not an example of a mutation.

Explanation:

Mutations occur in the chromosomes of the organism, in this case the fly. A mutation is a permanent alteration in the DNA of the fly. Therefore, if the fly were to have purple wings when it was born then it would be a mutation. However, in this case we dyed the wings of the fly purple. This does not alter or change the DNA in any way to cause a mutation.

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- Kay

Answer:

Hund's rule

Explanation:

Hund's rule  states that for an atom in the ground state, the number of unpaired electrons is the maximum possible and these unpaired electrons have the same spin.

I will clearly illustrate this using the ground state of the nitrogen atom. Nitrogen atom contains seven electrons. Its electronic configuration is; 1s2 2s2 2px1 2py1 2pz1.

Notice that the number of unpaired electrons in this configuration is maximum and they are all expected to possess the same spin in accordance with Hund's rule .

Answer:

Hddhdhrvssj83hdi

Explanation:

Yee8373hes7

That's the question right

Answer:

Covalent

Explanation:

Titanium and its first-nearest boron atoms form a strong covalent bond, so TiB2 has high melting point, hardness and chemical stability. Titanium atom releases two electrons to form Ti 2 + ions, and a boron atom gets one electron to come into B- ion

Answer:

its g :)

Explanation:

Answer: See explanation

Explanation:

Annalyn weighs 45.3 kg.

Roby is 2.56 kg lighter than Annalyn. This means that the weight of Roby will be:

= 45.3kg - 2.56kg

= 42.74kg

Together with Cecille, the three of them weigh 150.09 kg. Cecille weight will be:

45.3kg + 42.74kg + Cecille = 150.09kg

88.04kg + Cecille = 150.09kg

Cecille = 150.09kg - 88.04kg

Cecille weight = 62.05kg

To check of my answer is correct, I'll add all their ages together. This will be:

= 45.3kg + 42.74kg + 62.05kg

= 150.09kg

Answer:

Compound x = [tex] MgC_{2}O_{4}[/tex]

Explanation:

Let the compound be x

Assuming we have a 100g of compound x

Given the following data;

Magnesium, Mg = 21.6% = 21.6g

Carbon, C = 21.4% = 21.4g

Oxygen, O = 57.0% = 57.0g

Now, we would find the amount of moles for each element.

Atomic mass of Mg = 24.30g

Atomic mass of C = 12.01g

Atomic mass of O = 16.00g

Amount of moles for Mg;

21.6*(1/24.30) = 0.89mol

Amount of moles for C;

21.4*(1/12.01) = 1.78mol

Amount of moles for O;

57.0*(1/16.00) = 3.56mol

We then divide by the smallest to find the ratio;

0.89/0.89 = 1 Mol of Mg

1.78/0.89 = 2 Mol of C

3.56/0.89 = 4 Mol of O

Therefore, the ratio of Mg, C and O is 1:2:4.

Compound x = [tex] MgC_{2}O_{4}[/tex]

Hence, the empirical formula of the compound is [tex] MgC_{2}O_{4}[/tex]

Answer:

No

Explanation:

during chemical change, a new product is formed with entirely different properties with the element.

that's why water does not behave like hydrogen or oxygen but like water.

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Here, we are required to determine of the Sodium chloride formed from the reaction of sodium and chlorine retain any of the characteristic properties of either sodium or chlorine.

The reaction between sodium and chlorine to form Sodium chloride is a chemical change.

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Answer:

As compared to metals, they have low density and will melt at low temperatures. The shape of nonmetals cannot be changed easily because they are brittle and will break. Elements that have properties of both metals and nonmetals are called metalloids. They can be shiny or dull and their shape is easily changed.

Explanation:

The temperature at thermal  equilibrium : 16.1 °C

Q absorbed = Q released

Heat can be formulated :

Q = m.c.Δt

c= specific heat, J/g°C

Δt = temperature different, C°

m= mass, g

Q water=Q substance

[tex]\tt 3500\times 4.18\times (t_2-15)=70\times 0.89\times (270-t_2)\\\\14630(t_2-15)=62.3(270-t_2)\\\\14630t_2-219450=16821-62.3t_2\\\\14692.3t_2=236271\\\\t_2=16.1^oC[/tex]

Answer:

a chemical change is usually an irreversible chemical reaction. an example of this is rusting.

a physical change is usually visible while a chemical change isn't. also, a chemical change is irreversible while a physical change is.

Explanation:

Answer:

false

Explanation:

Answer:

Option A is not true

Explanation:

Could you please follow me and mark me as the brainliest answer

According to the statements of your question, the answer is B: elements contain equal numbers of neutrons and electrons.  

To find the correct answer, we must evaluate each statement.

A. Elements contain equal numbers of protons and electrons

It is correct. In a neutral atom, the number of protons and electrons is the same. When an atom gain or lose electrons, the number of electrons is bigger (the atoms gain electrons) or lower (the atoms lose electrons) than the number of protons.          

B. Elements contain an equal number of neutrons and electrons.

It is false. The nucleus of an atom is composed of neutrons and protons, where the atomic mass is given by:

[tex] A = Z + N [/tex]

Where:

Z: is the number of protons = atomic number

N: is the number of neutrons

The difference between the numbers of neutrons, protons, and electrons is evidenced in the so-called isotopes. These are atoms of the same element that have the same number of protons (and hence the same number of electrons if the atom is neutral) and a different number of neutrons in the nucleus.

An example is the hydrogen element, whose isotopes are protium (¹H), deuterium (²H), and tritium (³H). In all of them, the number of protons and electrons is the same (equal to 1), the number of neutrons is 0, 1, and 2, respectively, and the atomic masses are 1, 2, and 3, respectively.                  

C. Elements contain protons and neutrons in their nucleus.

It is correct. According to Rutherford's atomic model, the nucleus of an atom is composed of protons and neutrons with electrons moving around the nucleus.      

D. Elements contain electrons that orbit around the nucleus.

It is correct.  As we said earlier, Rutherford's atomic model states that negatively charged electrons move in circular paths around a positively charged nucleus. Later, Bohr proposed an atomic model based on circular paths with discrete energy values.        

You can find more about the atomic model here:

I hope it helps you!