Please help. I’m stuck

the element sodium has 1,000,000 million energy levels. in an electrically neutral sodium atom- there are 3 energy levels.

Answer:

Sodium has 11 electrons. The first two fill the innermost energy level. The second energy level is also full, holding eight electrons and one electron remaining in the outer energy level. It is the number of outer electrons that give an element its chemical properties.

Explanation:

Answer:

A: dependent variable

B: experimental group

C: independent variable

D: control variables

E: control group

Explanation:

Answer:

option b is correct

Explanation:

Metals are particularly good conductors of heat because their particles are very closely packed so the vibrations are passed on very quickly. They also contain large numbers of free electrons. These drift slowly through the structure, giving metals their strength and other properties. As the metal is heated, the free electrons closest to the heat source are heated. This makes them move faster and they travel through the metal, colliding with both atoms and other electrons. This naturally makes these vibrate faster (or move through the metal faster in the case of collisions with other free electrons). Thus, the heat is passed quickly through the metal.

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please mark me as brainlist

Answer:

wait so dose it acid burn your body I would say hydrogen but I'm probably wrong tell me if I am

Answer:

See explanation

Explanation:

A word equation refers to a representation of a chemical process using word rather than appropriate chemical formulae.

Hence, the word equation for photosynthesis is this;

six moles of carbon dioxide + six moles of water -----> one mole of glucose + six moles of oxygen gas

The equation with formulae is;

6CO2 + 6H20 -------> C6H1206 + 6O2

Balanced chemical equation with states;

6CO2(g) + 6H20(l) -------> C6H1206(s) + 6O2(g)

Answer:

3.384364 time 10^24 atoms

Explanation:

multiply by avogadro's number

Answer:

It is possible she could get one.

Explanation:

To solve this problem we need to convert 98.3 kilometers/hour to miles/hour.

In other words, we convert km to mi, to do so we multiply 98.3 km by a conversion factor, putting the unit we want to have in the numerator, and the unit we want to convert in the denominator:

Given that the little old lady is doing 61 miles/hour, she could get a speeding ticket.

Agricultural research careers would a student studying biotechnology most likely pursue. Therefore, option C is correct.

The United States Department of Agriculture's main internal research organization is the Agricultural Research Service. One of the four organizations in the USDA's mission area for research, education, and economics is ARS.

A wide definition of agricultural research is any research activity that aims to increase crop output and quality through genetic improvement, improved plant protection, irrigation, storage techniques, farm mechanization, effective marketing, and better resource management.

Agricultural research's main goals are to advance knowledge and advance technology. It deepens comprehension of the linkages and interconnectedness between farming communities and production systems.

Thus, option C is correct.

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Complete question is;

When solid materials are heated.the heat absorbed/added to the materials caused the materials to change its form from?

Answer:

From solid to liquid

Explanation:

When we heat solid materials, the heat causes the forces of attraction between the molecules to become weaker and as such, the material becomes more loose than it was in the solid state. As a result, the material now becomes a liquid because the molecules now have lesser forces of attraction and are a bit loose.

Answer:

It's Mass

Explanation: I took the quiz

Have a good day!

Mass is the amount of matter in an object. Therefore, option C is correct.

Mass can be defined as an intrinsic property of a body. mass can be described as the quantity of matter in a body. Different atoms and different particles with the same amount of matter have nonetheless different masses.

Mass can be experimentally measured by the body's inertia, meaning the resistance to acceleration when a net force is applied. The mass determines the strength of its gravitational attraction to other bodies.

The SI base unit of measurement of mass is the kilogram (kg) and it is not the same as weight. Mass is generally determined by measuring the weight using a spring scale, rather than a balance scale and comparing it to known masses.

An object on the Moon will weigh less than it does on Earth due to the lower gravity but still have the same mass. Weight can be defined as a force, while mass is the property that determines the strength of this force.

Learn more about mass, here:

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Answer:

A. moving

Explanation:

Answer:

A. a power source connected to the primary coil

Explanation:

1.497 mol Ir

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

287.7 g Ir

Step 2: Identify Conversions

[PT] Molar Mass of Ir - 192.22 g/mol

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 4 sig figs.

1.49672 mol Ir ≈ 1.497 mol Ir

Answer:

[tex]\boxed {\boxed {\sf About \ 1.497 \ mol \ Ir }}[/tex]

Explanation:

To convert from grams to moles, we must the molar mass of iridium, which can be found on the Periodic Table.

Use the molar mass as a ratio.

[tex]\frac{ 192.22 \ g \ Ir}{ 1 \ mol \ Ir}[/tex]

Multiply by the given number of grams: 287.7

[tex]287.7 \ g Ir *\frac{ 192.22 \ g \ Ir}{ 1 \ mol \ Ir}[/tex]

Flip the fraction so the grams of Iridium will cancel.

[tex]287.7 \ g Ir *\frac{1 \ mol \ Ir }{ 192.22 \ g \ Ir}[/tex]

[tex]287.7 *\frac{1 \ mol \ Ir }{ 192.22 }[/tex]

[tex]\frac {287.7 \ mol \ Ir }{192.22} \\[/tex]

Divide.

[tex]1.49672251 \ mol \ Ir[/tex]

The original measurement has 4 significant figures, so we must round our answer to 4 sig figs as well. For the answer we calculated, that is the thousandth place.

The 7 in the ten thousandth place tells us to round the 6 up to a 7.

[tex]1.497 \ mol \ Ir[/tex]

There are about 1.497 moles of iridium in 287.7 grams.

Answer:

Emissions produced by burning fossil fuels

Explanation:

these gases decreases the ph level of rain water that makes water acidic

Answer:

it would be C

Explanation:

Answer: C

Explanation:

both numbers have 2 S.F. so the answer should have 2 too.

Answer:

the object should be displaced on which the force is applied

Explanation:

HOPE IT HELPS YOU

Answer:

Ps5

Explanation:

Answer:

well the answer to that is  climate change

Explanation:

because with climate change the temperature and hot and cold it is depending on where you live

Answer:

1. Algae

2. Insects

3. Crayfish

4. Trout

5. Herons

Explanation:

Answer:

id.k sorry

Explanation:

Answer:

like ground rocks and shells I think.

Explanation:

Answer:

The energy required is 158 J

Explanation:

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

When the heat added or removed from a substance causes a change in temperature in it without affecting its molecular structure, this heat is called sensible heat.

In other words, when a system absorbs (or gives up) a certain amount of heat, it can happen that it experiences a change in its temperature, which implies sensible heat.

The equation that allows calculating heat exchanges is:

Q = c * m * ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case:

Replacing:

Q= 0.79 [tex]\frac{J}{g*C}[/tex] *10 g* 20 C

Solving:

Q= 158 J

The energy required is 158 J

Answer:

Deciliter = 0.1 L

Explanation:

The options are unit of volume. In order to determine which is greatest, all the options would be converted to liter.

Microliter = 1e-6 L

Mililiter = 0.001 L

Deciliter = 0.1 L

Centiliter = 0.01 L

Among all the options; Deciliter = 0.1 L is the greatest.

Answer:

b

Explanation:the shell is 2 so ignore the 1s electrons it is only the level 2 electrons that are valence

Answer:

The volume will decrease and the balloons will be smaller

Answer:

Any characteristic that can be determined without changing the substance's chemical identity. chemical property: Any characteristic that can be determined only by changing a substance's molecular structure

Explanation:

Answer:

Graham's law states that the rate of effusion or of diffusion of a gas is inversely proportional to the square root of its molecular weight. So, rate of diffusion of hydrogen gas is four times faster than oxygen gas.

Explanation:

Answer:

Rate of diffusion of hydrogen is higher than other gases because mass of hydrogen is very small and it diffuses easily.

Explanation:

Answer:

Es so es na formula pero te balto la convinasiones de la formula

Answer:

Explanation:

A) 0.150

B) 0.300

C) 0.450

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Answer:

it will have 1 valence electron as its in the first group in the periodic table.

It will lose electrons as its easier.

The charge will be 1+ as it lost 1 .