Which type of rock does B represent?
A. Igneous rock
B. Metamorphic rock
C. Rock formed by compaction
D. Rock formed by heat and pressure

Answer:

limiting reactant

Explanation:

it is consumed totally

Answer:

Chemical reactions that absorb (or use) energy overall are called endothermic. In endothermic reactions, more energy is absorbed when the bonds in the reactants are broken than is released when new bonds are formed in the products.

Answer:

Are there any options or starting points for this question?

Explanation:

A gene is the basic unit of an organism. Gene is encompassed inside the nucleus  of a cell where all the chromosomes and DNAs are located. Thus option A is correct.

Chromosomes are genetic materials contained in a gene inside the nucleus of a cell. There are different number of chromosomes in each level of organisms.

Chromosomes are made of proteins and DNA (deoxyribonucleic acid). it is a thread like structure having a knot in the center. In human beings there are 23 pairs of chromosomes in each cell.

Chromosomes are transferred to the offspring from the parents and thus they are the genetic material inherited from the parents.  Thus gene is the functional unit of heredity. Genes codes each proteins and are responsible for the characteristics of each organism.

Therefore, gene is a structure that contains many chromosomes. Hence, option A is correct.

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Answer:

d

Explanation:

The amount of time it will take for the 40g sample to get cut in half is 30 minutes

Answer:

The forensic scientist must be able to tell the difference between the substances.

Explanation:

It is important for forensic scientists to be able to identify particular drugs so they have evidence for the case that a certain drug was present.

The goal of forensic drug chemistry is to determine whether the material submitted contains an illegal substance.

The substances that have Delta Hf = 0 kJ/mol are O2(g), Br2(l), He(g), Fe(s).

Delta Hf = 0 is the standard enthalpy of any element in its most stable form is equal to zero.

When enthalpy is negative, the delta Hf is minus zero, which means the system releases heat.

When the system gains heat, the delta Hf is positive.

Thus, the substances are O2(g),  Br2(l), He(g), Fe(s).

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Answer:

1,4,5,6

Explanation:

Answer:

I'm pretty sure that the answer is c

Answer:

C12H6 : Molecular

C2H4O : Empirical

C8H8S4 : Molecular

Explanation:

Molecular formula : tells you the exact number of atoms of each element are in a compound. If the number of elements can be simplified it is molecular.

Empirical formula : tells you the most reduced ratio of elements in a compound. If the number of elements is already in it's simplest form it's likely empirical.

C12H6 - this is molecular because C12H6 can further be simplified to C2H

C2H4O - this is empirical because C2H4O cannot further be simplified

C8H8S4 - this is molecular because C8H8S4 can further be simplified to C2H2S

Answer:

CH2O4

Explanation:

empirical formula for C2H4O8 is CH2O4

Answer:

At noon

Explanation:

The sun at solar noon reaches its highest point when it is due South.

Answer:

alpha-linolenic acid and linoleic acid

Explanation:

Hope this helps!

Answer:

in text

Explanation:

But the main reason for using pure nitrogen is resistance to leakage. Nitrogen molecules find it harder to sneak out through the tire past the rubber molecules than oxygen molecules. This makes nitrogen a good bet for race car, aircraft and heavy-duty equipment where precise or constant pressure is critical.

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Answer:10

Explanation:

Multiply the volume by the density to get the mass.

Divide the mass by the molar mass to get the number of moles.

Answer:

that number formula units of mole that meansis You need to learn it on Yt

Example:

There are 6.022×1023 in 1 mole of anything, including formula units. You need to determine the number of moles in 0.335 g CaO . Once you know the number of moles of CaO , you can determine the number of formula units by multiplying the number of moles by 6.022×1023

Answer:

A) 4.65mol

Explanation:

[tex]\frac{2.80x10^{24}atoms }{1} *\frac{1 mol}{6.02x10^{23}atoms } =4.65mol[/tex]

Answer:

Sulfur

Explanation:

S+2e−→S2−

Answer:

C. Rock, dust, and ice.

Explanation:

Comets are frozen leftovers from the formation of the solar system composed of dust, rock, and ices.

Answer:

5.23 moles

Explanation:

Hope this helps!

The earth and other planets start drifting into space.

If the sun disappear from the universe, then Earth would be drawn to a new center of gravity. The gravity of Earth and the other planets of the solar system adversely affected due to no constant supply of energy from the sun which leads to drifting of earth into space.

In conclusion, the earth and other planets start drifting into space.

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Answer:

A. The total mass of materials present after a chemical reaction is the same as the total mass present before the reaction.

Explanation:

Law of conservation states that whatever mass you start with you will end with, mass cannot be gained or lost

Answer:

Fluorine

Explanation:

It is a non-metal does not conduct electricity

The poorest conductor of electricity is fluorine.

All of these are metals and metalloids so they are the good conductor.

Calcium

silicon

cobalt

sodium

Fluorine is a nonmetal so it is not a good conductor.

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Answer:

14.28 [tex]cm^{2}[/tex]

Explanation:

Multiply length by width to get area: 3.4 x 4.2 = 14.28

The answer will be in units of cm x cm =  [tex]cm^{2}[/tex]

Answer:

stick together like magnets

Explanation:

Answer:

If a positively charged body is brought near to a neutral or uncharged body, it induces a negative charge on the near side and a positive charge on the far side of the neutral object. This creates a force of attraction between the two bodies.

The error of this scale measurement is equal to 0.02 kg.

Given the following data:

To calculate the error of the scale measurement:

Measurement can be defined as an act (process) through which the weight, size, magnitude or distance traveled by an object or body is taken, especially for the purpose of an experiment.

Mathematically, the error of a scale measurement is given by this formula:

[tex]Error = Actual \;measurement-Measured \;value[/tex]

Substituting the given parameters into the formula, we have;

[tex]Error = 5.00-4.98[/tex]

Error = 0.02 kg.

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The mass of bromine that would be formed is 639 g

From the question,

We are to determine how many grams of bromine would be formed

First, we will write the balanced chemical equation for the reaction,

The balanced chemical equation for the reaction is

F₂ + 2HBr → 2HF + Br₂

This means, 1 mole of fluorine reacts with 2 moles of HBr to produce 1 mole of bromine.

Then,

4.00 moles of fluorine will react with excess HBr to produce 4.00 moles of bromine.

Therefore,

The number of moles of bromine produced is 4.00 moles

Now, for the mass of bromine formed,

Using the formula,

Mass = Number of moles × Molar mass

Molar mass of bromine = 159.808 g/mol

Then,

Mass of bromine formed = 4.00 × 159.808

Mass of bromine formed = 639.232 g

Mass of bromine formed ≅ 639 g

Hence, the mass of bromine that would be formed is 639 g.

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