Carbon-12 and carbon-14 are isotopes of carbon. Scientists can compare the ratio of
carbon-14 to carbon-12 within an organic object to determine its age. How are isotopes
different from one another?
They have different numbers of neutrons.
They have different numbers of valence electrons.
They have different chemical properties.
They have different numbers of protons.

Answer:

Stone, brick,

Explanation:

Answer:

Point

Explanation:

An object of indeterminate size which marks a location in space is called a point.

A point in geometry has no dimension unlike a line which is one dimensional. In essence, like other bodies, we cannot specify any of the width, length or height of a point.

On the other hand, a line is a connects two or more points and it is one dimensional. They usually have lengths.

Therefore, an object of indeterminate size which marks a location in space is a point.  

Answer:

I think the answer would be A.

Explanation:

Solubility property will vary between two different- sized samples of the same substance.

Solubility is a physical process in which solute particles are dissolved in the solvent substance for the formation of solution.

Hence the property solubility will vary between two different- sized samples.

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Answer:

0.005356

Explanation:

Answer:

His mistake was that he also gave the plants  in the music room some fertilizer

Explanation:

When carrying out a reliable experiment, the only variable should be the question being tested. The question here is whether playing music for plants helps them grow faster. Therefore, all the plants should be grown in exactly the same conditions apart from the presence or absence of music.

However, Jo also added fertilizer to the plants in the room where music was playing. Therefore, we don't know whether the fertilizer or the music caused the plants to grow faster.

Instead, Jo should have not given fertilizer to any of the plants, or given fertilizer to all the plants.

Answer: It’s A because you change the independent variable to conduct an experiment and get accurate results.

Explanation:

Answer:

The correct answer would be A

Explanation:

I did the test :)

Answer:

i think sience is important cause it helps us understand things i am  muslim and i trust my religon amore than seince but also trust sience

.Explanation:

cause it helps me understand and learn things

Answer:

there are 18

Explanation:

Answer:

10.81 amu

Explanation:

The average atomic mass of Boron can be calculated as follows :

[tex]A=19.9\%\ \text{of}\ 10.01294 +80.1\%\ \text{of}\ 11.00931\\\\A=\dfrac{19.9}{100}\times 10.01294 +\dfrac{80.1}{100}\times 11.00931\\\\A=10.81\ \text{amu}[/tex]

So, the average atomic mass of boron is 10.81 amu.

Given :

Oxygen gas ([tex]O_2[/tex]) that are needed to react with 0.725 moles of aluminum (Al).

[tex]4Al(s)+3O_2(g)->2Al_2O_3(s)[/tex]

Solution :

4 moles of Aluminium react with 3 moles of oxygen,

Let, moles of oxygen react with 0.725 moles of Al is x.

[tex]x=\dfrac{0.725\times 3}{4}\\\\x=0.54375\ moles[/tex]

Hence, this is the required solution.

The number of moles that should be required to react is 0.54375 moles.

Since There are 0.725 moles of aluminum (Al)

And, there is the chemical equation 4Al (s) + 3O2 (g) ⟶ 2Al2O3 (s)

The above equation represent 4 moles of Aluminium should be react with 3 moles of oxygen.

So, the number of moles should be

= 0.725 * 3/4

= 0.54375 moles

Therefore, The number of moles that should be required to react is 0.54375 moles.

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Answer:

Benzene

Explanation:

You need to calculate the densities for each compound.

EtOH = 5.85/7.5 = 0.78 g/mL

Benzene = 6.60/7.5 = 0.88 g/mL

0.88 > 0.78, thus benzene is denser than ethanol.

Answer:

Benzene is denser than ethanol.

Explanation:

Given data:

Volume of ethanol = 7.5 mL

Mass of ethanol = 5.85 g

Volume of benzene = 7.5 mL

Mass of benzene = 6.60 g

Which is denser = ?

Solution:

First of all we will calculate the density of both substances.

Density of ethanol:

d = m/v

d = 5.85 g/ 7.5 mL

d = 0.78 g/mL

Density of benzene:

d = m/v

d = 6.60 g/ 7.5 mL

d = 0.88 g/mL

The density of benzene is higher thus it is denser than ethanol.

Answer:

Isotopes of an element are atoms of the same element that have different number of neutrons.

Answer:

I believe its gas

Explanation:

because it has no symbolic bonds

I am not sure with the answer but I think the answer is solid.

Answer:

Explanation:

look at the mole ratio so you can solve  

Answer:

IM NOT SURE

Explanation:

Answer:

Chemical, the foaming of the ingredients makes it a chemical reaction

Explanation:

hope this helps

Answer:

Bromine Pentachloride (BrCl5)

Explanation:

The name of the compound  BrCl₅ is bromine pentacloride as it has five chlorine atoms.

Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.

Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:

1)Molecular compounds where in atoms are joined by covalent bonds.

2) ionic compounds where atoms are joined by ionic bond.

3)Inter-metallic compounds where atoms are held by metallic bonds

4) co-ordination complexes where atoms are held by co-ordinate bonds.

They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.

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Answer:

11

Explanation:

The number of electrons is the same as the number of protons. Protons are the atomic number.

Answer:

Explanation:

Oppositely charged particles attract each other, while like particles repel one another. Electrons are kept in the orbit around the nucleus by the electromagnetic force, because the nucleus in the center of the atom is positively charged and attracts the negatively charged electrons.

Answer: about 0.013 feet

Explanation:

well there’s about 0.003 foot in a mm

Answer:

The immune system

Explanation:

It defends from outside pathogens that may get into the body

Answer:

3.10g

Explanation:

Please see the attached picture for the full solution.

Answer:

Mass = 42 kg

Volume = 2 m^3

By using formula = Density = Mass/Volume

= 42/2

= 21/1

= 21

= 21 m^3

Answer:A.

Explanation:

In this case, the object receives the action. Which lines up with newton's law " an object will stay at rest unless acted upon by an outside force." The football is being kicked, which means a direct outside force acted upon this.

Newton's first law states that An object at rest will stay at rest unless acted upon by an outside force. The example D  a floating stick carried over the water fall depicts the first law of motion.

Newton proposed three laws to describe the motion of an object. The first law states that, an object at rest will stay at rest unless acted upon by an outside force. The tendency to stay in its current state is called inertia of the object.

Newton's second law states that, the force acting on an object is the product of its mass and acceleration. Third law of motion states that, for every action, there is an equal and opposite reaction.

Among the given options, the example, of the baseball player sliding onto the second base is an illustrating first law of motion. The baseball player slide to avoid over running and to protect themselves.

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Answer: C

Here is how I used Process of Elimination:

An hypothesis is your guess before you conduct the experiment.

An inquiry is when you ask for information.

A law is a statement based on repeated experiments.

The answer had to be conclusion.

Hope it helps!

m/v=19.3

m/17.78×9.21×4.45=19.3

19.3×17.78×9.21×4.45=m

3m=2,186.11323g

Complete question is;

Which of the following kinds of cells perform basic functions such as obtaining energy from food?

A) Plant cells, but not animal cells

B) Animal cells, but not plant cells

C) Both plant cells and animal cells

D) Neither animal cells nor plant cells

Answer:

Option C: Both plant cells and animal cells.

Explanation:

Correct Answer is;

Option C: Both plant cells and animal cells.

This is because both plant and animal cells need food for survival as food gives energy for movement and work operations.

Other options are not correct because they infer that either cell or none of them obtains energy from food which is false.

Answer:

The answer is

Explanation:

To find the number of moles of an element given the number of entities contained in that element , we use the formula

[tex]n = \frac{N}{L} \\[/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question

N = 1.204 × 10²⁴ lithium atoms

We have

[tex]n = \frac{1.204 \times {10}^{24} }{6.02 \times {10}^{23} } \\ [/tex]

We have the final answer as

Hope this helps you