Which of the following elements is a metalloid? A. phosphorus B. cobalt C. silicon D. magnesium

Answers

Answer 1

Answer: silicon

Explanation:it just is

Answer 2

Respuesta

es la C. silicio

Explanation:

No existe una definición estandarizada de elemento metaloide ni un consenso completo sobre los elementos que son metaloides.

En la clasificación de metaloides se suelen incluir a:

Boro (B)

Silicio (Si)

Germanio (Ge)

Arsénico (As)

Antimonio (Sb)

Telurio (Te)


Related Questions

I NEED HELP!!
In a stream, how are particles such as silt, clay, and sand carried?
A. as dissolve load
B. as bed load
C. in suspension
D. in solution

In a stream, how are particles such as silt, clay, and sand carried?
A. particles rubbing together
B. An increase is suspended materials
C. an increase in the dissolve load
D. changes in the stream 's carrying capacity

The path of a stream can vary considerably, depending on the slope of the land and the
A. bedload of the stream
B. amount of rainfall
C. amount of hummus present in the soil
D. Type of material through which the stream flows

The amount of dissolved material that stream water carries is usually expressed in
A. cubic meters per second
B. parts per million
C. cubic feet per minute
D. grams per 1000 gallons

The carrying capacity of a stream depends on both the velocity and the
A. Temperature of the water
B. amount of water in the stream
C. type of material through which the stream flows
D. minerals dissolved in the stream

Answers

Answer:

1 B

2A

#D

3B

1D

2B

3C

4A

A,C,A,B

C,A,C,A

C,A,A,B

Explanation:

Easy ive done this brings back memories

In  ecosystem, particles are carried as  bed load by rubbing particles together.Path of stream can be varied depending on amount of humus present in  soil and is measured in cubic meters per second and carrying capacity depends on  type of material through which stream flows.

What is an ecosystem?

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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The radioactive isotope used in the dating of fossils thought to be less than 40,000 years old is ________________.

Fill in the blank.

Answers

Answer:

The answer is Radiocarbon

A massless length of twine can withstand a maximum tension of 490 N. The twine is used to spin a 28-kg ball in horizontal circular motion of radius 1.8 m. The ball is spun faster and faster until the twine breaks. What was the maximum speed of the ball?

7.2 m/s
3.2 m/s
5.6 m/s
11 m/s

Answers

Answer:

5.6 m/s

Explanation:

Which statement correctly describes protons and neutrons? *
O They have the same mass and the same electrical charge.
They have different masses but the same electrical charge.
O They have different masses and different electrical charges.
They have the same mass but different electrical charges.

Answers

Answer:

They have the same mass but different electrical charges.

Explanation:

Protons have a positive charge while neutrons have a neutral charge. Although they have different charges, they have the same amount of mass.

The protons and neutrons have the same mass but different electrical charges. THerefore, option (D) is correct.

What is a proton?

A proton is described as a stable subatomic particle, a chemical symbol with +1e elementary charge. The mass of the proton is approximately equal to the mass of the neutron but 1836 times the mass of an electron.

Protons and neutrons are jointly together termed "nucleons" each with masses of approximately one atomic mass unit (a.m.u.). There will be one or more than one proton present in the nucleus of an atom. There is an attractive electrostatic central force that holds the atomic electrons.

The number of protons in the atom is referred to as the atomic number and is expressed by the symbol Z. Since each element in the periodic table has a unique number of protons, determines the chemical characteristics of the element.

As the neutrons present in the nucleus of an atom are neutral and do not carry any charge while the protons are positively charged.

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What will most likely happen if you place a piece of metal in a base?
O A. The metal will turn into a salt.
O B. The metal will neutralize the base.
C. The metal will give off a gas.
O D. The metal will not react with the base.

Answers

Answer:D

Explanation:

The metal will not react

Many elements will try to obtain ____ electrons in their outermost energy level (which is very stable) because filling it in may require too much energy.

A: 2
B: 6
C: 12
D: 8
E: 4

Answers

I’m pretty sure 8 as well because elctrouns can’t hold more than that

How many grams of H2SO4 are needed to react with 78.86 grams of AI(NO3)3 ?
I

Answers

Answer:

53.18 grams of H₂SO₄ are needed to react with 78.86 grams of Al(NO₃)₃.

Explanation:

The balanced reaction between Al(NO₃)₃ and H₂SO₄ is:

2 Al(NO₃)₃ + 3 H₂SO₄ → Al₂(SO₄)₃ + 6 HNO₃

By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of reagents are required:

Al(NO₃)₃: 2 molesH₂SO₄: 3 moles

Being the molar mass of the elements:

Al: 27 g/moleN: 14 g/moleO: 16 g/moleH: 1 g/moleS: 32 g/mole

then the molar mass of the reactants are:

Al(NO₃)₃: 27 g/mole + 3*(14 g/mole + 3*16 g/mole)= 213 g/moleH₂SO₄: 2*1 g/mole + 32 g/mole +4*16 g/mole= 98 g/mole

Then, by reaction stoichiometry, the following reagent mass amounts are required:

Al(NO₃)₃: 2 moles* 213 g/mole= 436 g H₂SO₄: 3 moles*98 g/mole= 294 g

Then you can apply the following rule of three:  If by stoichiometry 436 g of Al(NO₃)₃ react with 294 g of H₂SO₄, 78.86 g of Al(NO₃)₃ with how much mass of H₂SO₄ will it react?

[tex]mass of H_{2} SO_{4} =\frac{78.86 grams of Al(NO_{3} )_{3}*294gramsofH_{2} SO_{4} }{436 grams of Al(NO_{3} )_{3}}[/tex]

mass of H₂SO₄=53.18 g

53.18 grams of H₂SO₄ are needed to react with 78.86 grams of Al(NO₃)₃.

what form of heat transfer makes warm air rise?

Answers

Convection which allows heat to be transferred between the air molecule via convection currents .

Learning Task No. 3: Write a short paragraph regarding the differences between
saturated and unsaturated solutions.
Type of Solution
Explanations about the differences of
the two solutions
Saturated solution
Unsaturated solution​

Answers

Answer:

See explanation

Explanation:

A saturated solution is a solution that contains just as much solute as it can normally hold at a given temperature in the presence of undissolved solute. An unsaturated solution contains less solute than it can normally hold at a given temperature. A saturated solution can not dissolve more solute whereas an unsaturated solution can comfortably dissolve more solute until it attains saturation at a specified temperature.


The rate of change of position (or distance traveled) with respect to time"

Answers

Answer:

Velocity...I believe

Answer: velocity or meters per second

Explanation:

Why do restaurants sometimes serve free salty snacks like popcorn, crackers, or peanuts? Are they just being nice?

Answers

Answer:

it most likely goes with your meal

Explanation:

hope this helps

This is a change in an objects motion caused by an unbalanced force

Answers

Answer:

This is a change in an objects motion caused by an unbalanced force.

- Acceleration

Answer:

Pressure

Pressure is done when a force is applied to an object to course a motion

What is the correct name and HELPPP!!
What is the name and formula of an ionic compound containing the element with the
atomic number of 5 bonded to Carbonate? *
Boron Carbonide; B2(CO3)3
Boron Carbonate; B,CO,
Boron Carbide; B,CO,
Boron Carbonate; B2(CO3)3

Answers

Answer:

Boron Carbonate; B₂(CO₃)₃

Explanation:

For names, carbonide does not exist; that rules out the first option. Carbide refers to just a carbon atom, not carbon and oxygen as in the polyatomic ion carbonate. That rids us of the third option. We are left with boron carbonate with the formula BCO or boron carbonate with the formula B₂(CO₃)₃.

Recall the carbonate polyatomic ion's formula: CO₃²⁻

Thus BCO cannot be the formula.

Option 4 is your answer, Boron Carbonate; B₂(CO₃)₃.

To further check your answer, observe the oxidation states of boron and the polyatomic ion carbonate. Boron can exist in oxidation states of either 2+ or 3+, and carbonate is only 2-; in this formula, boron will exhibit a 3+ state to balance out with carbonate.

2x3+ = 6+; 3x2- = 6-

6+ + 6- = 0; balanced

Which of the following might be included in a chemical
reaction?



a Molecules
b lons
C Pure elements
d All of the above

Answers

Answer:

D. All of the above

Explanation:

Molecules, ions, and pure elements might be included in a chemical reaction. Therefore, option (d) is correct.

What is a chemical reaction?

A chemical reaction can be described as a reaction that brings the chemical conversion of one chemical substance to another chemical substance. The reactions cause chemical changes that include the rearrangement of electrons in order to create and break bonds between atoms.

The compound or molecules which are primarily utilized in a reaction are called reactants. Chemical reactions give products, which possess characteristics different from the reactants of the reaction.

Chemical reactions take place at a definite rate of reaction at a given concentration, temperature, and pressure. The rate of reaction increases with the rising temperature of the reaction as more activation energy is available for reactant molcules collisions.

Therefore, in a chemical reaction reactants and products can be present as Molecules, ions, and pure elements.

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How do the products of chemical reactions compare to their reactants? Question 5 options: The products usually weigh more than the reactants. The products often have completely different properties than the reactants. The products usually have more atoms than the reactants. The products are usually more toxic than the reactants.

Answers

Answer:

The products often have completely different properties than the reactants.

Explanation:

In a chemical reaction, the products are often completely different from the reactants.

When chemical reactions takes place, the species rearranges to form new bonds and to attain stability.

Therefore, the new products formed usually have completely different properties when compared to the reactants.

Also, in chemical reactions, mass is always conserved. The mass of the products and reactants are usually the same.

7th grade help me plzzzzzz

Answers

the three subatomic particles are protons, neutrons and electrons.

which best represents a compound?

Answers

Answer:

The one above B

Explanation:

The one above B is most represents a compound because compounds are chemically bonded and are always near each other.

which statement is a scientific law

Answers

Answer:

It is b

Explanation:

Salt is a common example of a(n) _____________ bond, while Water is a common example of a(n) _____________ bond.

Answers

Ionic bond
Covalent bonds

Answer:

salt is ionic bond and water is Polar covalent bond

Explanation:

A student reports the following measurements for a set of pennies: 102.0mL, 91.0 g. What is the density of the pennies.

Answers

Answer:

V = 102.0 ml

m = 91.0 ml

density = ...?

density = m / V

= 91.0 / 102.0

= 0.89215 g/ml

1. Carson completed conductivity testing on the solutions shown in the data table below and recorded his findings in the conductivity column. After determining which solutions conducted electricity and which solutions did not conduct electricity, Carson needs to explain his findings so that he can make predictions about conductivity in the future without having to complete the testing. Why do some of the solutions conduct electricity and some of the solutions not conduct electricity?

Results of conductivity testing: image

Consider Carson's findings, then make a claim to answer the question. Be sure to support your claim with sufficient evidence and reasoning.

Answers

Answer:

See below :)

Explanation:

There is an evident reason why some of the solutions Carson's has listed and observed, does conduct electricity and some that do.

A flow of electrical charge is called an electric current. Ions are atoms, or sets of atoms, that contain an electrical charge. There are two types of ions, cation or a positively charged ion containing a deficiency of electrons, and anion or a negatively charged ion which contains a surplus of electrons. When a solution conducts electricity the charge is carried within by ions that move through the solution. The larger the number of ions in the solution, the better the conductivity of the solution is. Pure water does not conduct very well because it contains very few ions, but when table salt (NaCl) is dissolved in the water, this solution does conduct well because the solution contains a more abundance of ions. The majority of the ions come from the table salt, chemically names sodium chloride. Because Sodium contains its sodium ions, and these are positive charge and chloride ions which is a negative charge, it is called an ionic substance. Not every substance is made up of ions, one such example is sugar (C12H22O11). Sugar is made up of uncharged particles also called molecules. Although sugar is a substance its molecules do not hold a charge, thus when sugar is dissolved in water, the solution does not conduct electricity, due to the lack of ions in the solution.

Therefore, depending on the ions that make up the compound, the substance would or would not conduct electricity.

7th grade help me plzzzzzzzzzz

Answers

The first choice is correct
density is mass divided by volume

Which is NOT a shape of epithelial cells?
A.Cuboidal
B.Columbar
C.circular
D.squamous

Answers

B.should be *columnar, but C.Circular is the answer

What are the two factors that can affect the current in a wire

Answers

Answer:

I know one of them is definitely material but the second one could be length or thickness....

Hope this helps

.....also I got my answer on google if you want to look it up to make sure I'm right......

What is the opposite force to pushing off the ground to jump?

Answers

Answer:

Newton's Third Law of Motion states that to every action there is an equal and opposite reaction. When the earth pushes on you to send you into the air after jumping, you also push on the earth with the same force. But forces are different from accelerations. A force F is a push or pull on an object

Explanation:

Answer:

Friction

Explanation:

Friction causes an opposite force

What makes up an isotope’s mass number?
A.) The number of protons and neutrons
B.) The number of protons, neutrons, and electrons
C.) The number of stable isotopes of an element

Answers

Answer:

A

Explanation:

How long does it take to melt a single brick, how many mins?

Answers

Answer:

it depends upon the material used to make the brick

74 minutes I believe, really shot in the dark there

Karsten performed a scientific study on the way that a certain chemical affects ecosystems. After Karsten published his results, one of his peers said that Karsten's conclusion was influenced by selection bias. What did Karsten's peer mean by this statement?

A.
Karsten did not choose the correct topic to study.
B.
Karsten did not spend enough time studying the chemical.
C.
Karsten's data did not support his published conclusion.
D.
Karsten's results could have been different in other ecosystems.

Answers

Answer:

C

Explanation:

an example of a physical change that does not involve any changes in CHEMICAL PROPERTIES. Explain which physical properties have changed and list a chemical property which has not changed.

Answers

Answer:

Ripping a Paper

Explanation:

Physical Properties changed - The size has decreased, and the shape has changed.

Chemical property- Flammability

Meh peepss halp will mark brainliest!!!! u-u

Answers

Answer:

The three parts of the cell theory are as follows: (1) All living things are made up of cells, (2) Cells are the smallest units (or most basic building blocks) of life, and (3) All cells come from preexisting cells through the process of cell division. ... Today, the cell theory is considered the foundation of biology.

Explanation:

hope this help.. brainliest???

Answer:

i wanna give brailiest to the person at the top!

Explanation:

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