Calculate the answer. Express It In scientific notation. All answers should have the correct number of significant figures.
(4.9 x 10^-2) (9.80 x 10^2) =
48.02
48
48 x 10^-1
4.8 x 10^1

Answer:

640 grams

Explanation:

look up Solubility table in wikipedia for potassium nitrate (KNO3)

32 grams of potassium nitrate (KNO3) water solubility at 20 degrees celsius (room temperature) can be dissolved in 100 milliliters (0.1 L) of water.

2 liters = 2000 milliliters

32 grams / 100 milliliters = x grams / 2000 milliliters

cross-multiply

100 * x = 32 * 2000

x = (32 * 2000) / 100

x ≈ 640 grams

chatgpt

Answer:

Mantle convection is the very slow creeping motion of Earth's solid silicate mantle caused by convection currents carrying heat from the interior to the planet's surface. The Earth's surface lithosphere rides atop the asthenosphere and the two form the components of the upper mantle.

I think it is helpful for you!!!!

Please make me brainliest..

Answer:

C. the amount of drug x given to mice

Answer: 4 moles of ammonia.

Explanation:

So you’re trying to make NH 3

 from N 2

 and H 2

.

In chemistry, that is denoted by the following reaction:

N 2

 + H 2

 → NH 3

But you can’t create or destroy atoms, so you need to have the same number of both of them on the same side.

You have 2 hydrogen atoms on the left and 3 on the right. How can we make both amounts the same? If we try to make 2 NH 3

 molecules instead of 1, we have 6 hydrogen atoms in total. 6/2 =3 H 2

 . This also means we have 2 nitrogen atoms, so we have balanced the equation.

N 2

 + 3 H 2

 → 2 NH 3

Now comes the fun part. Those numbers in front of the different formulas are the amount of moles that go into the equation. You need 1 mole of nitrogen and 3 moles of hydrogen to make 2 moles of ammonia. If we multiply these numbers by 2, we can also say you need 2 moles of nitrogen and 6 moles of hydrogen to make 4 moles of ammonia. (And you’d have 1 mole of nitrogen left over.)

Answer:

Ca2+ I'm not sure hahahahhahah

Answer:

Ca

hope it is helpful..

We need to count the number of oxygen atoms present in each component of the formula and then multiply by the appropriate coefficients.

In hydroxyapatite (Ca10(PO4)6(OH)2), we have:

Breaking down the formula, we find:

So, for each formula unit:

Adding the oxygen atoms from each component:

24 oxygen atoms (from PO4 units) + 2 oxygen atoms (from OH units) = 26 oxygen atoms per formula unit.

Now, multiplying by the 6 formula units:

26 oxygen atoms x 6 formula units = 156 oxygen atoms.

Therefore, in 6 formula units of hydroxyapatite, there are a total of 156 oxygen atoms present.

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An example in the section discusses disassembling a hydrogen atom.

The hydrogen atom is the simplest and most abundant element in the universe, it consists of one proton and one electron. Disassembling a hydrogen atom refers to the process of separating its electron from the proton, which can be achieved through the application of energy. One method to disassemble a hydrogen atom is through ionization. Ionization occurs when a hydrogen atom absorbs enough energy to cause its electron to become excited and eventually detach from the proton, forming a hydrogen ion. This process plays a significant role in various scientific and industrial applications, including plasma research and nuclear fusion experiments.

Another example of disassembling a hydrogen atom is through chemical reactions. When hydrogen atoms react with other atoms or molecules, they form new chemical compounds by sharing or exchanging electrons, this process effectively disassembles the original hydrogen atom, as its electron becomes part of a new atomic or molecular structure. Understanding the disassembly of a hydrogen atom provides valuable insights into the behavior of matter at the atomic level and contributes to advancements in various fields such as chemistry, physics, and astronomy. So therefore a hydrogen atom is an example in the section discusses disassembling.

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The equilibrium constant for the phosphorylation of glucose to glucose 6-phosphate (G6P) may be estimated using the chemical reaction equation and the process's standard Gibbs free energy change.

The chemical process for phosphorylating glucose to G6P is as follows: G6P + ADP = glucose + ATP Using the standard Gibbs free energy changes for the reactants and products, as well as the standard reaction quotient, the standard Gibbs free energy change (G°) for the reaction may be computed (Q). The conventional Gibbs free energy change is written as: ΔG° = ΔG°f(products) (products) - ΔG°f(reactants) (reactants) The standard reaction quotient (Q) may be computed using the reactant and product concentrations at equilibrium. The equilibrium constant (Kc) is then computed as the product ratio. Ratio the products' activities (or concentrations) to the product of the reactants' activities (or concentrations), raised to the power of their stoichiometric coefficients: [G6P][ADP] / [glucose] = Kc To determine the equilibrium constant, the values for G°, the activities (or concentrations) of the reactants and products, and the stoichiometric coefficients must be known. Furthermore, the value of the equilibrium constant changes with temperature and must be recalculated whenever the temperature changes.

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The quantity of heat energy needed to raise the temperature of  \(1\)gram of a substance by  \(1\) degree Celsius is known as the substance's specific heat capacity. This material has a specific heat capacity of about \(0.180 J/(g^\circ C).\)

To determine the substance's specific heat capacity,

\(q = m \times c \times \delta T\)

where m denotes the substance's mass, c denotes its specific heat capacity, and T is the temperature change. Here, q denotes the amount of heat that is communicated.

The mass of the substance \((m = 2.2 g),\) the temperature change \((T = 80.0°C - 50.0°C = 30.0°C),\) and the heat energy communicated (q = 11.8 J) are all given in this problem.

When the formula contains these values,

\(11.8 J = 2.2 g \times c \times 30.0^\Circ\)

Solving for c, we get:

\(c = 11.8 J / (2.2 g \times 30.0°C)\)

\(c ≈ 0.180 J/(g°C)\)

Therefore, This material has a specific heat capacity of about \(0.180 J/(g^\circ C).\)

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Temperature stays the same during state of matter change. After plotting the graph of temperature vs time and the curve is outlined, the moment the graph plateaus read the temperature that is constant(repeatedly occurs).

From the points given in the table of value, am sure the melting point is 78°C.

All the best!

Answer:

Chemical reaction, not physical

Explanation:

The mass of the iodine that can be obtained from the reaction is 79.5 Kg.

We know that we have to look at the stoichiometry of the reaction so as to be able to solve the question well. We know that to look at the stoichiometry, it is important that we should able to consider the mass - mass relationship between the compounds.

We have the reaction equation written out in the form; \(2KI --- > 2K + I_{2}\). We have been told in the question as we can see above that a sample of potassium iodide are decomposed into the constituent elements. and the sample produced 24.4 kg of potassium.

Number of moles of the potassium produced = the sample produced 24.4 * 10^3 g/39 g/mol

= 625.6 moles

If the reaction produces 2 moles of potassium and 1 mole of iodine then the number of moles of iodine produced = 625.6 moles/2

= 312.8 moles

Mass of the iodine produced = 312.8 moles * 254 g/mol

= 79.5 Kg

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Answer:

True

Explanation:

its true don't lie on here please

In giant covalent structures such as graphite or diamond, the atoms form strong bonds by sharing electrons. Therefore, the given statement is true.

A covalent bond can be defined as a chemical connection formed by the sharing of electron sets between particles. A covalent bond can be created by the mutual sharing of electrons from both atoms.

The pair of electrons that are shared in this kind of bonding is known as the shared or bonding pair. Covalent bonds are the sharing of bonding pairs of electrons that will provide the stability of the atom in its outer shell.

Elements that have very high ionization energies are incapable of exchanging electrons or elements having low electron affinity cannot accept electrons. Covalent bonding between two non-metallic atoms is characterized by the equal sharing of electrons between the atoms and covalent bonds with an electronegativity difference of participating atoms is more than 2.0.

Therefore, a giant structure like a diamond has strong covalent bonds that require a lot of energy to break.

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The measurement that has three significant figures is: (c) 5.10 x 10-1m. Therefore, the number of significant digits must be proportional to the accuracy of a measurement

Explanation: In chemistry, significant figures (also known as significant digits or precision) are a means of expressing the accuracy of a numerical value. They are a group of significant digits in a numeric value that carries meaning in its contribution to the value's measurement. Accuracy is the closeness of a measurement to the actual value of what is being measured. This implies that when a numerical value is specified to more significant digits than appropriate for the accuracy of the measurement, it becomes meaningless. For example, a measured length of 1.2354 cm is meaningless if the measurement instrument has a precision of just 0.01 cm or +/-0.005 cm since the digits "3" and "5" are not significant (the results are likely to be incorrect).

Therefore, the number of significant digits must be proportional to the accuracy of a measurement. A measured value should always be presented to the same degree of precision as the measurement tool used to obtain it. This implies that if the value obtained from the measurement tool is given to 2 significant figures, the measured value should be given to 2 significant figures.

Let's look at each option in the given question and find the number of significant digits.(a) 0.005 m - has only one significant digit, which is 5. Thus, this is incorrect.(b) 510 m - has 3 significant digits, which are 5, 1, and 0.

Thus, this is incorrect.(c) 5.10 x 10-1m - has 3 significant digits, which are 5, 1, and 0. Thus, this is the correct answer.(d) 5.1 x 10-2m - has two significant digits, which are 5 and 1. Thus, this is incorrect.(e) 5100 m - has 3 significant digits, which are 5, 1, and 0. Thus, this is incorrect.

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Using only maps, scientists observed several lines of evidence that led them to theorize that the continents were once joined together before there was evidence from rocks and fossils.

One key observation was the remarkable fit between the coastlines of different continents, such as South America and Africa. They noticed that the shapes of these continents seemed to match like puzzle pieces, suggesting they were once connected.

Additionally, scientists observed similar geological features across continents, such as mountain ranges and rock formations, that extended across apparent continental boundaries. They also noticed the distribution of certain plant and animal species that were found on different continents but had no means of natural dispersal.

These observations, made solely through maps, led scientists to propose the concept of continental drift, which was later supported by geological and paleontological evidence found in rocks and fossils.

Therefore, using only maps, scientists observed several lines of evidence that led them to theorize that the continents were once joined together before there was evidence from rocks and fossils.

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The behavior of the chemical in the given scenario where it still has a changing shape but a constant volume after a temperature change can be best described as a liquid.

A liquid is a type of matter that flows and conforms to the shape of its container. It is an intermediate state between solid and gas, as its molecules have more freedom of movement than those in solids but less freedom of movement than those in gases. This means that a liquid will take on the shape of whatever container it is put into but will maintain a constant volume since its molecules are still held closely together and do not have the energy required to escape into the air.

The properties of liquid can be explained as follows:

1. Liquids have changed shape

2. Liquids have a constant volume

3. The molecules of liquids are held together by weak intermolecular forces

4. Liquids are less ordered than solids

5. Liquids have a definite volume but not a definite shape therefore, the chemical in the given scenario still has a changing shape but a constant volume, which makes it a liquid.

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It's always important to drink responsibly and avoid drinking and driving. A fifth of distilled spirits is equal to about 750 ml.

Distilled spirits are beverages that have been distilled to increase their alcohol content.

Ethanol, a by product of sugar fermentation, is the primary component of alcoholic beverages.

Distilled spirits are also known as hard liquor or spirits in the beverage industry and include gin, vodka, brandy, tequila, and whiskey.

There are a few facts about distilled spirits:

All distilled spirits are distilled, but not all distilled beverages are distilled spirits.

Distilled spirits include a variety of drinks, including whiskey, brandy, vodka, and gin, among others.

It's always important to drink responsibly and avoid drinking and driving.

Conclusively, a fifth of distilled spirits is equal to about 750 ml.

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a) The substances in A and B mix and the result is depicted in C is chemical change.

b) The substances in A and B mix and the result is depicted in D is chemical change.

c) Under a third set of conditions, the sample depicted in C changes to that in D is a kind of physical change.

d) When the change in part (c) occurs both the sample formed have same chemical properties.

In first case,

When the substances A and B mix and the result is depicted in C this implies that A and B react to give another substance C. Since C contain atoms of both A and B therefore, it have different property than A and B. So, it is a kind of chemical change.

In second case,

When the substances A and B mix and the result is depicted in D this implies that A and B react to give another substance D in different set of condition. Since D also contain atoms of both A and B therefore, it also have different property than A and B. So, it is a kind of chemical change.

In third case,

As we know that C and D both formed by the reaction between A and B in different set of conditions. So, we can say that C and D basically differ from each other in terms of state. So, C can be converted into D by either cooling or boiling. So, it is a kind of physical change.

In fourth case,

Since, we found that both C and D are differ in state of matter but they have same Chemical properties as both are formed of A and B. So, we can say that, C and D have same chemical properties but have different Physical properties.

Thus, we concluded that when A and B react to form C and in other case form D it is Chemical change. When C converted into D, it is physical change while both have same chemical properties.

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The formula of the magnesium nitrate is Mg(NO₃)₂.  The magnesium nitrate that is  Mg(NO₃)₂ is the ionic compound.

The Magnesium nitrate is the compound that contains the one atom of the magnesium, the  two atoms of the nitrogen, and the six atoms of the oxygen. The formula of the magnesium nitrate is Mg(NO₃)₂.

The Magnesium Nitrate is an ionic compound that is formed by the cation of the Magnesium Mg²⁺, and the polyatomic anion that is the Nitrate NO³⁻ ion. The charges will be equal and it will be the opposite in order for the two ions to form the bond together. Therefore, the one charge of  + 2 of the magnesium ion will be require the two charge of  -1 nitrate ions to balance it.

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Answer:

double replacement

Explanation: the two elements on each side switch

Answer:

The five basic types of chemical reactions are combination, decomposition, single-replacement, double-replacement, and combustion. Analyzing the reactants and products of a given reaction will allow you to place it into one of these categories. Some reactions will fit into more than one category.

Answer:

SEE BELOW HEHEHE YOURE WELCOME

Explanation:

Types of Chemical Reactions

The purpose of this experiment was to make observations of the reactants and products and then later use this information to write a balanced chemical equation. My question before this experiment was how will the reactants affect the products. The hypothesis I made before this experiment was that based off of the materials being used, a gas will form, and so will a solid. I still do not know what the variables are in this experiment such as the independent or dependent.

The materials used in this experiment were:

Bunsen Burner

Striker

Tongs

Test Tube

Test Tube Rack

Test Tube Holder

Spatula

Sand Paper

Transfer Pipette

Tweezers

Evaporating dish

The substances used in this experiment were:

Copper wire

Sodium carbonate

Copper sulfate

Potassium iodide

Lead nitrate

Zinc

In this experiment we started off by placing about 20 drops of copper sulfate solution into a test tube and then put zinc into the test tube and watched it as single replacement occurred and zinc sulfate was the product.Next we put 10 drops of potassium iodide into another test tube and 10 drops of lead nitrate into a separate test tube. Then we added the lead nitrate into the potassium iodide and watched as double replacement occurred as lead iodide formed and potassium nitrate formed as well. Next, I sanded down a piece of 3-inch copper wire until it was shiny and watched as combustion and synthesis occurred when we held the piece of copper over a bunsen burner. Copper oxide was found formed on the wire. The other reactant in this equation was oxygen gas. After this, we used a small spatula to place about half an inch of sodium carbonate in a clean test tube and then heated the tube over the flame and watched as decomposition took place and carbon dioxide was released. The reaction was a gas formation and 2 products were formed. This was the lab experiment.

Based on this experiment and my hypothesis made beforehand, my hypothesis was almost correct other than the fact that I did not think that color change would occur so I was surprised by that. But other than that, my data did support my hypothesis showing that a gas and a solid were formed in two different ways. One error I made was when I was recording the data in a data table, I did not notice a color change at first but I rewatched the experiment. One way that I could have improved this lab investigation was pay more attention to the precise details because those make a huge difference.

Answer:

6%

Explanation:

60 g / 1000 g = 6%

The concentration of a solution in 60 g of NaCl are dissolved in 1L of water will be 6%.

The abundance of an ingredient ratio of the volume of a combination is called concentration. Mass concentration, molar concentration, number concentration, and volume concentration are all examples of mathematical descriptions.

Concentration can be calculated as:

C=m/V.

where, C is concentration , m is mass and V is volume.

It is given that, m = 60 g and V = 1L or 1000 mL.

Now, put the value of given data in above equation.

C= 60/1000

=6%.

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Answer:

he mass in grams of one mole of substance is called molar mass. Each element has its own unique molar mass. For example, carbons molar mass is 12.011 g/mol, and magnesium's molar mass is 24.3050 g/mol. To see why these elements have different molar masses, we need to remember that the atoms of different elements contain different numbers of protons, neutrons, and electrons, so they have different masses. The atomic masses given in the periodic table inside the front cover of this book represent the different weighted average masses of the naturally occurring atoms of each element. Different atomic masses lead to different molar masses.

For example, the atomic mass of magnesium (24.3050) shows us that the average mass of magnesium atoms is about twice the average mass of carbon atoms (12.011), so the mass of 6.022 x 1023 magnesium atoms (the number of atoms in 1 mole of magnesium) is about twice the mass of 6.022 x 1023 carbon atoms (the number of atoms in 1 mole of carbon). Thus the molar mass of magnesium is 24.3050 g/mol, compared to carbons molar mass of 12.011 g/mol.

Explanation:

be a cause animals have lots of energy and the run a lot to use the energy I think

1.01 * 10^7 grams/day

Given the reaction produced during the combustion of methane expressed as:

Calculate the moles of methane:

According to stochiometry, 1 mole of methane produces 2 moles of water. The moles of water produced at the end of the reaction will be:

Determine the mass of water produced in a day

Hence the mass in grams of water produced by this reaction in one day is approximately 1.01 * 10^7 grams

A solution of the ionic salt Lihco3 would have 11.3 pH.

In chemistry, salt exists as a chemical compound consisting of an ionic group of positively charged cations and negatively charged anions, which results in a combination with no net electric charge. A common example stands table salt, with positively charged sodium ions and negatively charged chloride ions.

The fragment ions in a salt compound can be either inorganic, such as chloride (Cl−), or organic, such as acetate (CH3CO−2). Each ion can be either monatomic, such as fluoride (F−), or polyatomic, such as sulfate (SO2−4).

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Answer:

About 8.94.

Explanation:

Because we are given a 500. mL volumetric flask, the solution will have a volume of 500. mL.

Find the number of moles of zinc fluoride needed. Recall that molarity is simply moles per liter of solution:

\(\displaystyle 500.\text{ mL} \cdot \frac{0.173\text{ mol ZnF$_2$}}{1\text{ L}} \cdot \frac{1\text{ L}}{1000\text{ mL}} = 0.0865\text{ mol ZnF$_2$}\)

Convert this to grams. The molecular weight of zinc fluoride is 103.38 g/mol:
\(\displaystyle 0.0865\text{ mol ZnF$_2$} \cdot \frac{103.38\text{ g ZnF$_2$}}{1\text{ mol ZnF$_2$}} = 8.94\text{ g ZnF$_2$}\)

In conclusion, about 8.94 grams of solid zinc fluoride should be added.

The formula for Iron (III) oxide is Fe2O3, which means that there are 2 iron atoms and 3 oxygen atoms in one molecule of Fe2O3.

What do you mean by molecules?

A molecule is a group of two or more atoms held together by chemical bonds. These atoms can be of the same or different types. Molecules are the smallest units of a compound that retain the chemical and physical properties of that compound.

Molecules play a critical role in many chemical reactions and biological processes. They can interact with each other through chemical reactions to form new compounds or release energy. Understanding the structure and behavior of molecules is fundamental to understanding many fields of science, including chemistry, biochemistry, and materials science.

The formula for Iron (III) oxide is Fe2O3, which means that there are 2 iron atoms and 3 oxygen atoms in one molecule of Fe2O3.

To find the number of moles of oxygen atoms in 1 mole of Fe2O3, we need to multiply the number of oxygen atoms per molecule by the Avogadro constant (6.022 x 10^23).

Number of moles of oxygen atoms in 1 mole of Fe2O3 = 3 x (6.022 x 10^23) = 1.8066 x 10^24

Therefore, there are 1.8066 x 10^24 oxygen atoms in 1 mole of Fe2O3.

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