How many hydrogen (H) atoms are on the reactants side

Answer:

a element and compounds

Answer:

The answer is D) compounds and pure substances.

Explanation:

Here's why: All three items are examples of compounds and pure substances. They are not pure elements or molecules.

Answer:

Boron

Explanation:

First, locate the metalloids on the periodic table. (First picture) The metalloids are in the yellow section. Next, remember that the group your element is in determines its valence electrons. For example, group 17/7A has 7 valence electrons. Look at the group numbers above each column on the periodic table to find out which metalloid is the answer. In this case, we need to look at 13/3A since we know that this metalloid has three valence electrons. Not all  periodic tables will be labeled with the 3A part, so remember that groups 13 and over have the amount of valence electrons after you take out the one in front. For example, group 16 has 6 valence electrons because I removed the one in front of it. Now your options should be limited down to boron because we know that it is in the yellow section in group 13.

Answer:

the answer is boron

Explanation:

got it right on edge

Answer:

Iron

Explanation:

The continental crust is less dense than oceanic crust because it contains less amount of iron.

The continental crust is predominantly rich in alumino-silicates.

Answer:

c. H20 (L) ->H20 (S)

Explanation:

its just water freezing lol

pls vote brainliest tho ❤❤

a. 0.5 mol

b. 25 cm³

c. (i) 75 cm³

(ii) 50 cm³

Avogadro's hypothesis:  

In the same T,P and V, the gas contains the same number of molecules  

So the ratio of gas volume will be equal to the ratio of gas moles  

 [tex]\tt \dfrac{V_1}{n_1}=\dfrac{V_2}{n_2}[/tex]

Reaction

2NO(g)+O₂(g)⇒2NO₂(g)

a. mol O₂

[tex]\tt mol~O_2=\dfrac{1}{2}\times 1~mol~NO=0.5[/tex]

b. volume of  O₂

[tex]\tt \dfrac{50}{1}=\dfrac{V_2}{0.5}\rightarrow V_2=25[/tex]

c. (i)total volume

[tex]\tt volume~NO+volume~O_2=50+25=75~cm^3[/tex]

(ii)volume of NO₂

[tex]\tt mol~NO_2=mol~NO=1\rightarrow V~NO=V~NO_2=50~cm^3[/tex]

Answer:

C. A physical change.

Explanation:

Given the image shown below.

It can be seen that the experiment is about phase changes of a substance. And phase changes of a substance is being done or carried out when the substance has passed through any of the processes such as melting, boiling, freezing, condensing, depositing, or sublimation.

And since these changes in the phase of a substance do not change the substance's chemical nature. It is called a physical change.

Therefore, in this case, Jorge's experiment involved "A physical change."

Answer: 15990 J (or something close to that if its multiple choice)

Explanation: So I did the math with my friend and I just took a test on this and I got it right soooo,

you take 75 (your mass) and multiply it by 4.18 (the heat capacity of a liquid) and then times that answer by 51 which is the temperature from subtracting your initial heat (25.0 C) to your ending heat (76.0 C) and all that together is 15988.5. With the significant figures included, my test answer was somewhere around 15990 J (sorry if it's not specific)

Hope this helps, I'm pretty clueless on these equations lol.

Answer:

Less than 22 grams because some mass is lost in the reaction

Explanation:

Took the test on K12

Answer:

Cr04^2-

Explanation:

Answer:

When an electron absorbs energy, it jumps to a higher orbital. This is called an excited state. An electron in an excited state can release energy and 'fall' to a lower state. When it does, the electron releases a photon of electromagnetic energy.

Explanation:

Answer:

an intrinsic characteristic of a particular acid, not related to concentration

Explanation:

this is easy

An intrinsic characteristic of a particular acid is not related to concentration. Hence, option B is correct.

An acid is any substance that tastes sour, changes blue litmus paper to red, reacts with some metals to liberate hydrogen, and reacts with bases to form salts.

Whereas pH measures the concentration of solvated protons and does not tell us about the intrinsic acidity of chemical species present in solution, electrode potentials tell us about the intrinsic oxidizing power of the species present but provide no information on their concentration.

By the addition of a sufficient amount of redox indicator to a solution, its redox potential can be measured using redox electrodes.

Hence, an intrinsic characteristic of a particular acid is not related to concentration.

Learn more about acid here:

https://brainly.com/question/3700851

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Answer:

It refers to the conventional sense of the elastic current

Explanation:

It is the traditional or the conventional sense of the elastic current as in the earlier days the experimenters and the scientist thought that the current moves out of the positive terminal or pole of the battery and enters through the negative pole or terminal of the battery.

It is because of the direction of the current flow as thought in early days, the sentence refers to the conventional sense.

Answer:

ionic.

Explanation:

the electronegativity difference is greater than 1.7.

The type of bond between boron and fluorine in BF₃ is non-polar covalent bond.

Covalent bond is defined as a type of bond which is formed by the mutual sharing of electrons to form electron pairs between the two atoms.These electron pairs are called as bonding pairs or shared pair of electrons.

Due to the sharing of valence electrons , the atoms are able to achieve a stable electronic configuration . Covalent bonding involves many types of interactions like σ bonding,π bonding ,metal-to-metal bonding ,etc.

Sigma bonds are the strongest covalent bonds while the pi bonds are weaker covalent bonds .Covalent bonds are affected by electronegativities of the atoms present in the molecules.Compounds having covalent bonds have lower melting points as compared to those with ionic bonds.

Learn more about covalent bond,here:

https://brainly.com/question/19382448

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Answer:

When light hits CRY2, it changes shape and binds to its natural partner protein, known as CIB1. When light shines on the cells, the CRY2 protein binds to CIB1, which is floating in the cell. CIB1 brings along a gene activator, which initiates transcription, or the copying of DNA into mRNA.

Explanation:

Answer:

Your answer would be:

Aristotle and Ptolemy, so answer B).

(if you use edge, than this should be correct)

Sorry about this answer being late, I just discovered it

Answer:

b

Explanation:

Answer:

conductivity in solid state/ in water

Explanation:

conducitvity in water state would be least helpful when trying to determine the bond type that has the strongest intermolecule force, becuase they (salt and water) both would dissolve in water the same.

The property that will be least helpful in the determination of the bond type that has the strongest intermolecular forces is C. Conductivity in water.

It should be noted that the students wanted to investigate whether ionic or covalent bonds have stronger intermolecular forces.

In order to carry out the investigation, salt, sugar, and molar balls are used. Based on this, the property that is required for the investigation will be flammability, solubility in water, and the melting point.

The conductivity in water isn't required.

Read related link on:

https://brainly.com/question/18426918

Answer:

How light is reflected from the surface of the mineral.

Explanation:

To know the the correct answer to the question, we must bear in mind the meaning of luster.

Luster simply means the shining properties of a substance when light ray fall on them.

Thus, considering the question and the options given above, luster simply indicates how light is reflected from the surface of the mineral.

Answer:

d

Explanation:

Answer:

Acceleration

Explanation: Force is how much one thing is being applied so it is not that and inertia is something sitting still so therefore using process of elimination, it is acceleration.

Answer: B. Acceleration

Explanation:

Answer:to find a mate, because of a diminished food source, drought, flooding, volcanic activity, destruction of habitat, human presence in a habitat, an earthquake, seasonal changes, overpopulation of an area

Explanation:

Answer:

241

Explanation:

all the numbers are significant but since you only need three it's only the first three numbers

Explanation:

two moles sodium (45.98 g), one mole sulfur (32.06 g), and four moles oxygen (64.00 g) combine to form one mole of sodium sulfate (142.04 g).

Answer:

b I my current pls let me known

Answer:

Formation of precipitate?

Explanation: When you do that the thingy dissolves the thingy so the thingy dissolves into nothingness of the nothing...

Explanation:

c dormancy :)))))))))))

Answer:

pushing rubber mats together to predict the behavior of plate tectonics

Explanation:

pushing rubber mats together to predict the behavior of plate tectonics is an example of direct observation because direct observation involves the process of using your senses and evaluating or observing closely the subject matter in other to gather informations. Through direct observations you can gather informations through activities, behaviors without depending on people's opinions to gather information needed.