Complete the model of a sodium chloride crystal by dragging the chlorine and sodium atoms to their correct positions.

Beryllium, Calcium, Radium elements should have the most similar chemical properties.

Chemical properties can be defined as a characteristics or behavior of the substance that be observed when it undergo a chemical change or reaction. Chemical properties may include flammability, toxicity, acidity, basicity, reactivity, heat of combustion and many more.

Beryllium, Calcium and Radium are the elements of alkaline earth metal and the share most of the similar chemical and physical properties.

Thus, Beryllium, Calcium, Radium elements should have the most similar chemical properties.

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Explanation:

................easy ngl

Answer:

for protons going down it is:

(already given)

6

6

8

8

17

17

for neutrons going down it is:

6

7

8

(already given)

10

18

20

for electrons going down it is:

6

6

8

8

(already given)

17

Explanation:

bascially the number of protons is the bottom number to the left and the number of electrons is the same as the number of protons and the number of neutrons is basically the mass number (the top right one) minus the proton number

hope this helps:)

The ideal gas equation can be used to determine the molar mass of the substance with the help of the moles. The molar mass of the gas having a mass of 0.458 grams is 9.15g/mol.

Ideal gas law gave the relation between the moles, pressure, temperature, volume, and the gas constant. The moles of the ideal hypothetical gas can be used to calculate the molar mass.

An ideal gas equation is given as:

PV =nRT

Given,

Mass = 0.458 gm

Pressure (P) = 0.98 atm

Volume (V) = 1.2 L

Temperature (T) = 287 K

Gas constant (R) = 0.0821

Substituting values in ideal gas as:

0.98 × 1.2 = n × 0.0821 × 287

n = 1.18 ÷ 23.56

n = 0.05moles

Now, moles are used to calculate molar mass as:

molar mass = mass ÷ moles

= 0.458 ÷ 0.05

= 9.15g/mol

Therefore, 9.15g/mol is the molar mass of the unknown gas.

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Sodium has more protons, neutrons, and electrons than Lithium.

The nuclei of atoms consist of protons and neutrons. Both component form the bulk of the mass of atoms.

Outside the nucleus, electrons are found in the orbitals surrounding the nucleus.

The atomic number of an atom is the number of protons in the nucleus of the atom. For neutral atoms, the number of protons and electrons is the same.

The atomic number of Lithium is 2, while that of Sodium is 11. This means Lithium has 2 protons while sodium has 11.

The atomic mass of Lithium is 7 while that of sodium is 23. This means that sodium has more neutrons than lithium.

Thus, sodium has more neutrons, electrons, and protons, than lithium.

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Answer:

oil & mining are big in earth sciences

Answer:

false

Explanation:

there are lot of aspects of Mars that they are disconcerting still like scientists get paid a lot because of that astronomers get paid a lot because of that also.

The empirical formula of the compound is CH₃

The empirical formula is determined as follows:

Given the general equation of the combustion of hydrocarbons as follows:

CxHy + O₂ → x CO₂ + y H₂O

mass of CO₂ produced = 3.54 g

molar mass of CO₂ = 44 g/mol

moles of C in the sample = 3.54/44  = 0.08 moles

molar mass of C = 12 g/mol

mass of C in the sample =  0.08  * 12 = 0.96 g

mass of H₂O produced  = 1.09 g

molar mass of water = 18 g/mol

moles of H in the sample = 1.09 /18  * 2

moles of H in the sample = 0.12 moles

Ratio of C : H = 0.08 : 0.12

Ratio of C : H = 1 : 3

Therefore, the empirical formula of compound = CH₃

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From the question, the point at which the heating curve does plateau is the boiling point of water.

The heating curve is used tool that we use to see how the temperature change by the addition of heat affects the state of matter in which the material is obtained. The vertical axis could be used to plot the temperature while the horizontal axis could be used to plot the changes in the state of matter.

There are three states of matter namely;

Liquid

Solid

Gas

Water can be able to exist in all the states of matter that have been mentioned but there is a temperature range at which each state of matter can be observed. Thus we have the solid range, liquid range and the gaseous range of water.

Looking at the graph, when we begin to heat the water, the water is liquid at the start but the temperature increases rapidly. This increase would continue until the temperature  of the water begins to plateau. The point of plateau is the boiling point of water.

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This state at a specific temperature is called phase change.

For example, evaporization is phase change process in which the water changes from a liquid to a gas (water vapor).

Other example, condensation is phase change process in which the water changes from a gas to a liquid.

Heating curve of water show how the temperature changes as water is heated up. A heating curve for water that shows transition zones (see the picture below).

The first phase change is melting, the temperature stays the same while an ice melts.

The second phase change is boiling, the temperature stays the same while a water boils.

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Answer:

Methane

Explanation:

Beause it's a compound

Answer:

A methane

Explanation:

Methane is one carbon compound in which carbon is attached by hydrogen atom's. It's molecular formula is CH4

Answer:

do u need answer for all of them?

The molecular mass of reactants and products in 2H2 + O2 —> 2 H2O is 36 g/mole.

Molecular mass can be defined as the some of the atomic masses of all the atoms in the molecule of a substance.

It is a molecule relative mass represented by atomic mass unit. It is used to those substance whose constituent particles are molecule.

The molecular mass of  2H2 + O2 —> 2 H2O can be calculated as:

= 2(1x2) + (16x2) -> 2(1x2 + 16)

= 2(2) + 32 ->2(2 + 16)

= 4 + 32 -> 36

= 36 -> 36

Therefore, the molecular mass of reactant is equal to the molecular mass of product.

Thus, the molecular mass of reactants and products in 2H2 + O2 —> 2 H2O is 36 g/mole.

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Tony with an average speed of 70m/min walks the distance from his house to school in a time of: 30 min

The formula and procedure we will use to solve this exercise is:

t = x/v

Where:

x = distance

t = time

v = velocity

Information about the problem:

Applying the time formula we have that:

t = x/v

t = 2100 m/ (70m/min)

t = 30 min

It is a physical quantity that indicates the displacement of a mobile per unit of time, it is expressed in units of distance per time, for example (miles/h, km/h).

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The one with higher temperature is the one with NaOH as heatis given off during the neutralization reaction that occurs.

Volume can be defined as the amount of space a substance or an objects occupies usually in a closed container.

Volume is measures in litres.

When water is added to dilute acid like HCl, they become more dilute.

When NaOH is added to HCl, a neutralization reaction occurs.

The student will determine the contents of the flasks by adding 10 ml of hcl to each flask. If the NaOH reacts with the Hcl, there will be an increase in temperature.

The increase in temperature is due to the heat of neutralization of the reaction between NaOH and HCl.

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Pyramid of energy has not an advantage: B. Assigning the decomposers and detritivores to a particular trophic level.

Pyramid of energy is a graphical representation of the amount of energy at each trophic level of a food chain (see the picture below).

The bottom level represents the producers, followed by primary, secondary and tertiary consumers.

The decomposers and detritivores do not have a particular trophic level.

Decomposers break down dead plants and animals into simpler inorganic substances.

Detritivores are organisms, for example a fungus or an earthworm, that are decomposing organic matter.

Decomposers have very important role in the circle of life.

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Answer:

b. Assigning the decomposers and detritivores to a particular trophic level.

Explanation:

Taking into account the definition of atomic number and mass number, the three true statements are:

All atoms are made up of subatomic particles: protons and neutrons, which are part of their nucleus, and electrons, which revolve around them. Protons are positively charged, neutrons are neutrally charged, and electrons are negatively charged (electrons).

The atomic number of a chemical element is the total number of protons that each atom of that element has.

Atoms in nature are electrically neutral, so the number of positive and negative particles is the same. That is, in an atom that has no charge, the atomic number also indicates the number of electrons.

The mass number indicates the total number of particles in the nucleus. That is, the mass number is the sum of the number of protons and the number of neutrons in the atomic nucleus:

Mass number = (number of protons) + (number of neutrons)

So, If you know the number of protons and the mass number, the number of neutrons can be calculated as:

Number of neutrons= mass number - number of protons

Considering the definition of atomic and mass number, you can know:

Finally, the three true statements are:

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The metals are malleable and ductile, which means that they can be beaten into sheets and can be given any desired shape while the nonmetals are brittle and soft. Metallic elements are considered as good conductors of electricity and heat while nonmetallic elements are poor conductors. Metals are lustrous while nonmetals are nonlustrous.

A metal is a material that, when freshly prepared, polished, or fractured, shows a lustrous appearance, and conducts electricity and heat relatively well. Metals are typically ductile (can be drawn into wires) and malleable (they can be hammered into thin sheets).

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When cytosine reacts with NaNO2 and HCl to form Diazonium salt.

Diazonium salt or diazonium compounds are defined as the group of the organic compounds which sharing a common functional group [R−N⁺≡N]X⁻ where R is any organic group, like an alkyl or an aryl, and X can be an organic or inorganic anion, like a halide.

As we know that, Cytosine is a 6 membered ring consisting of

Thus, we concluded that the cytosine reacts with NaNO2 and HCl to form Diazonium salt.

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The replacement of gold from trapped pedestal is a mathematical equation.

Density is defined as the measurement of how tightly the material is packed together. It can also be defined as the substance mass per unit volume.

The S.I. unit of density is kilogram per cubic meter.

Density =  mass / volume

Thus, the replacement of gold from trapped pedestal is a mathematical equation.

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Chemical Formula : It is the method of showing the information about the chemical proportion of atoms of a given element.

Types of Chemical Formula : There are three types namely

1. Molecular

2. Empirical

3. Structural

a.  The chemical formula of the given compound asked in the problem are :

i. Copper (II) oxide - CuO

ii. Iron (III) Carbonate - Fe2(CO3)3

iii. Magnesium Sulphate - MgSO4

b. The proportion by mass of the given compound are :

i. CuO = Atomic mass of copper and oxygen are = 64 and 16

so, mass proportion = 64 / 16 = 4 : 1

ii. Iron Carbonate :  = 14 :1

iii. Magnesium Suphate - 24 / 32 = 3:4

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cell is a basic unit of all living things.

Explanation:

because all the metabolic activities performed by the body are outcome of cellular activities

The distance between the two points ( 8 , − 5 ) and ( 1 , 1 ) is determined as 9.2 units.

The distance between two points is calculated using the following equation.

for a given points (x1, y1), (x2, y2), the distance, d is;

d = √[(x2-x1)² + (y2 - y1)²]

From the given question;

x1 = 8, y1 = -5

x2 = 1, y2 = 1

distance = √[(1-8)² + (1 - -5)²]

distance = √[(-7)² + (16)²]

distance = 9.22 units

Thus, the distance between the two points ( 8 , − 5 ) and ( 1 , 1 ) is determined as 9.2 units.

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Nothing happens if the iron rod is inserted into the nitrogen. However, when the iron rod is suspended in the air.

A non-metal, nitrogen is. As a result, it typically interacts with metals to create ionic compounds. Only when the reactants produce products that allow the system as a whole to release energy does the reaction take place. If the system requires energy to undergo the reaction, the reaction cannot take place. When iron is exposed to oxygen and moisture for an extended length of time, a process known as iron oxide occurs. At the atomic level, oxygen bonds to iron to produce the complex known as an oxide, which weakens the metal bond.

The complete question is - If a piece of pure iron is placed in pure nitrogen, nothing happens. If the iron is exposed to air, it begins to rust. What conclusion can you make about air, based on this observation?

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Answer: 2(B)

Explanation: It's a little confusing to read but from my understanding it's 2 because the atomic number is the number of protons in an atom, and isotopes have the same atomic number but differ in the number of neutrons

A covalent bond is likely to be polar when one of the atoms sharing electrons is more electronegative than the other atom.

When the electronegativity difference is greater, the bond polarity is increasing.

Electronegativity (χ) is a property that describes the tendency of an atom to attract a shared pair of electrons.

Atoms with higher electronegativity attracts more electrons towards it, electrons are closer to that atom.

For example, water (H₂O) is a polar molecule. Atom of oxygen has higher electronegativity and negative charge, while atom of hydrogen has lower electronegativity and positive charge. Atoms of hydrogen and oxygen are connected by polar covalent bonds.

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The reaction between 3.214 g magnesium and 8.416 g bromine produces  9.7 g of MgBr2.

The balanced chemical reaction of magnesium and bromine is shown below.

Mg + Br2 → MgBr2

Step 1: Convert the given mass of reactants to moles of reactants

moles Mg = mass Mg / molar mass Mg

moles Mg = 3.214 g / 24.31 g/mol

moles Mg = 0.1322 mol

moles Br2 = mass Br2 / molar mass Br2

moles Br2 = 8.416 g / 159.808 g/mol

moles Br2 = 0.0527 mol

Step 2: Bromine (Br2) is determined to be the limiting reactant. Since the stoichiometric ratio between the reactants is equal to 1, the reactant with a lower number of moles would be the limiting reactant.

Step 3: Convert moles of Br2 to the mass of MgBr2. Their stoichiometric ratio is also 1, which makes the solution easier.

mol Br2 = mol MgBr2

mass MgBr2 = mol MgBr2 * molar mass MgBr2

mass MgBr2 = 0.0527 mol * 184.118 g /mol

mass MgBr2 = 9.70 g

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When looking for a mathematical relationship between two variables use a line graph.

A mathematical variable is one that can be found by the use of algebra or by a the use of graph. We know that a line graph involves plotting the independent variable on the horizontal axis and the dependent variable on the vertical axis.

The relationship between the two variables can be determined by studying how much the data set suits a particular equation of line of best fit or by considering the correlation coefficient of the scatter plot.

Hence, when looking for a mathematical relationship between two variables use a line graph.

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Missing parts;

When looking for a mathematical relationship between two variables, use a _____.

A. line graph

B. circle graph

C. bar graph

D. data table

The density in g/cm³ is 0.2095 g/cm³.

The mass of a material substance per unit volume is known as density. The equation for density is d = M/V, where d represents density, M is mass, and V is volume. Density is often measured in grams per cubic centimeter. The weight of an object can be calculated by dividing its mass by the acceleration of gravity; this value is often more significant practically than the mass.

Other tables include information on the weight of various materials per unit volume; this quantity is also known as weight density, specific weight, and unit weight. also take a look at specific gravity. The most popular way to indicate particle density is as n, which instead of referring to the number of particles per unit volume

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The final Concentration of salt having a 5.0 ml sample of a protein in 0.5m nacl. you place the protein/salt sample inside dialysis is 0.62mM.

Concentration is defined as the ratio of number of moles of substance to the volume of the substance occupied.

The dialysis is normally dilution of the solution as the dialysis bag the salt present in protein sample is pass and go to the dialysing rhe solvent (water).

As we know that,

M1V1 = M2V2

M1 and M2 are the initial and final concentration of NaCl in the dialysis bag.

V1 and V2 are the initial and final volume of NaCl in the dialysis bag.

Given,

M1 = 0.5M

V1 = 5mL = 0.005L

V2 = 4 + 0.005 = 4.005L

By substituting all the values, we get

M2 = 0.5 × 0.005/4.005

= 0.00062M

= 0.62mM.

Thus, we calculated that the final Concentration of salt is 0.62mM.

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DISCLAIMER:

The above question is incomplete.

Here is the complete question:

You have a 5.0 ml sample of a protein in 0.5M NaCl. You place the protein/salt sample inside dialysis tubing and place the bag in a large beaker of distilled water. Your goal is to remove as much NaCl from the sample as possible. Since you know that the final salt concentration will be the same inside the tubing as out, you can calculate the final concentration of the salt.

A. If you decide to place the dialysis bag in 4.0 L of distilled water for 12 h the final concentration of the salt would be in ________ mM

Answer:

Determine the weight of an object. For example, a glass of water weights 200 grams net (not including the glass).

Find out the volume of an object. In our example, it's 200 cm3 .

Divide weight by volume. 200 g / 200 cm3 = 1 g/cm3

Optionally, change the unit.

Explanation:

Answer:

erosion

Explanation:

erosion is when the top layer of the earth gets slowly worn away bhy water and ither stuff.