Help asap, A student produced this results table to show the reactivity of the halogens. Explain what the results show. ​

Answer:

9.64g/mL

Explanation:

Given parameters:

Mass of the metal  = 106g

Volume of cylinder = 50mL

Volume difference  = 31mL  - 20mL  = 11mL

Unknown:

Density of the metal  = ?

Solution:

To find the density of the metal, we use;

 Density  = [tex]\frac{mass}{volume}[/tex]  

 Density  = [tex]\frac{106}{11}[/tex]   = 9.64g/mL

Answer:

B. They are highly reactive.

Explanation:

Answer:

B: They are highly reactive

Explanation:

Sodium(Na) and potassium(K) are in the same family/group which is the Alkali Metal group.  These groups have their ability to displace H2(g) from water and create a basic solution. Alkali metals are also known to react violently and explosively with water. This is because enough heat is given off during the exothermic reaction to ignite the H2(g). Therefore, they are similar because of their reactivity.

Hope I helped!

Answer:

11508 liters

Explanation:

The Faruq family uses 548 liters of water per day.  The Chammas family uses 3 times as much water  per day. How much water does the Chammas family use per week?

Solution:

The amount of water used by the Chammas family is three times that of the Faruq family per day, hence:

Amount of water used by Chammas family in a day = 3 * water used by Faruq family in a day

Amount of water used by Chammas family in a day = 3 * 548 = 1644 liters

The amount of water used by the Chammas family in a week = 1644 liters per day * 7 days in a week = 11508 liters

Therefore 11508 liters of water was used by the Chammas family in a week

320 g IF₇

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Step 1: Define

7.3 × 10²³ molecules IF₇

Step 2: Identify Conversions

Avogadro's Number

Molar Mass of I - 126.90 g/mol

Molar Mass of F - 19.00 g/mol

Molar Mass of IF₇ - 126.90 + 7(19.00) = 259.9 g/mol

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 2 sig figs.

315.056 g IF₇ ≈ 320 g IF₇

Answer:

I believe the answer is A. molecules are larger than atoms so they should be visible and atoms and molecules are indeed different

To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. Therefore, the correct option is option A.

Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.

In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron.  Most atoms are bonded together to make a molecule. Molecules combine to form compounds.

Therefore, the correct option is option A.

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Answer:

75 grams

Explanation:

At 95 °C, you can dissolve up to 75 grams of K2Cr2O7 in 100 mL of water.

The solubility of a substance in a particular solvent is the maximum amount of that substance that can dissolve in the solvent at a given temperature. The solubility of a substance can be affected by factors such as temperature, pressure, and the presence of other substances.

For K2Cr2O7, the solubility in water is highly dependent on temperature. At 95 °C, the solubility of K2Cr2O7 in water is approximately 75 g/100 mL. This means that at 95 °C, you can dissolve up to 75 grams of K2Cr2O7 in 100 mL of water. Since 100 g of water is equivalent to 100 mL, you can dissolve up to 75 grams of K2Cr2O7 in 100 g of water at 95 °C.

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This absolute amount of pressure does not play a significant difference.

At high temperatures and low pressures, its results deviate too little.

But at low temperatures and high pressures, it will change significantly and this difference will change from gas to gas.

In the image you can see the difference between some results from both equations.

Answer:

The pan on the bottom right with the arrows pointing up.

Explanation:

conduction is the transfer of heat through touching surfaces, so when you place the pan on a hot stove, the heat heats up the bottom of the pan, and then the water in it.

The transfer of energy between systems through work is the expansion of gas in a steam engine. Therefore, the second diagram in the second row shows the correct direction of flow of heat.

Energy transfer is a phenomenon in which energy transfer from one matter to another matter. Energy can be transferred in two forms that are by doing work or by transferring heat.

Heat can be transferred by three ways conduction, convention and radiation. In conduction, when two object are in direct contact, transfer of molecules takes place. When heat flow through touching surfaces is called conduction. Heat flows in the upward direction from bottom in a pan.

Therefore, the second diagram in the second row shows the correct direction of flow of heat.

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Explanation:

If you look back at the formula ( SO2 ), you can see that there is one sulfur and two oxygens present. Therefore, the molar mass of sulfur dioxide is [1 × 32.1 + 2 × 16.0] = 64.1 g/mol.

Answer:

2Fe(s) + 3O2(g) --------> 2FeO3(s)

Explanation:

According to the question, a  battery was used  to light the steel wool by bringing the terminals very close together. When  the battery came into contact with the steel wool, current was sent out through the thin wire.  This caused the iron to heat up quite well.

Iron reacts with oxygen under these conditions as follows;

2Fe(s) + 3O2(g) --------> 2FeO3(s)

This is the chemical reaction that occurs when the steel wool is set on fire.

Chemical equation involved in Dr. Jeff's demonstration is

2 Fe+3 O₂[tex]\rightarrow[/tex]2 FeO₃

Battery is a device which helps in conduction of current. When a battery is used to pass a current through  a substance in this case which is steel wool made up of iron it starts getting heated up.

The amount by which substance gets heated up is directly proportional to the current passing through it. As more current is passed through the battery it gets heated more.

During heating, the iron present in the steel wool reacts with oxygen to form iron oxide with iron present in the+3 oxidation state.When the heat exceeds a certain point the steel wool catches fire due to the heat generated. The  heat causes the electrons present in steel wool of iron to move faster and collide with each other  thus generating more heat.

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Answer:

I think carbon and hydrogen

Answer:

Its carbon and hydrogyen

Explanation:

got it right on edge

Answer:

Apollo 11 made a capsule landing

Explanation:

Answer: i don’t know what type of landing you mean

Explanation:

They did a lunar landing then reentry and then capsule landing.

Answer; the answer is variations

The unit of genetic material that determines how living things look is called variations, look below for more description.

Hereditary variety alludes to contrasts among the genomes of individuals from similar species. A genome is all the innate data — every one of the qualities — of a creature. Hereditary variety is the distinction in DNA successions between people inside a populace.

For example, the human genome contains somewhere close to twenty and 25 thousand qualities.

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Aluminum is solid at room temperature and will, therefore, have a melting point that is above room temperature.

The room temperature is about 25 degrees Celsius.

Argon and oxygen are gases at room temperature.

Mercury is a liquid at room temperature.

Aluminum, on the other hand, is solid at room temperature. Hence, its melting point is definitely somewhere above room temperature.

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Answer:

The symbol that represent a salt is CaCl2

Explanation:

The CaCI2 is the calcium chloride that an organic compound now a salt having a chemical formula i.e. CaCI2. Also it is non-color cyrstalline solid at the room temperature also it is highly soluble in the water

Therefore as per the given situation the symbol that represent a salt is CaCI2

This is the answer and the same is not provided in the given options

Answer:

This compound is HNO2

Explanation:

HNO2 ----> H+ + NO2

When metals and non metals combine in fixed proportion then a chemical compound is formed So, the compound that will be formed from  hydrogen ion and nitrate ion is Hydrogen nitrate.

Chemical formula is a formula where cation and anion combine to form a molecule in fixed proportion. Metals combine in form of cation and non metals combine in form of anion.

Cation is the species that give electron and attain positive charge while anion is a species which gain electron and attains negative charge so when anion and cation combine in fixed ration the the overall charge of the molecule is zero that is molecule is neutral, the charge over cation and anion is also called oxidation state.

Therefore, the compound that will be formed from hydrogen ion and nitrate ion is Hydrogen nitrate.

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Answer:

Some of the product is a gas that goes to the atmosphere.

Explanation:

Based on the chemical reaction of baking soda (Sodium bicarbonate: NaHCO₃) with vinegar (Acetic acid: CH₃COOH):

NaHCO₃(aq) + CH₃COOH(aq) → H₂O(aq) +  CO₂(g) + CH₃COONa(aq)

When the reaction occurs, one of the products (CO₂) is a gas that will disappear of the mixture to stay in the atmosphere. That is the reason why there are missing 3 grams.

Answer:

B. Controlled variables

Explanation:

The Dependent sample t-test compares the mean score of measurements in one group to that of another other group. It mainly used when analyzing comparable sample units as it pairs repeatable observations within a time frame.

Controlled variables are factors that are not tested and remain constant. Some examples of controlled variables are temperature, pressure, volume etc

Answer:

2 moles

Explanation:

1.9982182553889358 real number but round up to 2

Explanation:

There is a limit to different things we encounter around the universe due to a lot of reasons.

To overcome these barriers, some catalysts that are not readily available are needed. This reduces the combination of some atoms in nature.

This and many more reasons limits the combination of chemical substances.

There is a limit to different things we encounter around the universe due to a lot of reasons:

So, for a chemical reaction to occur there are certain parameters that need to taken into consideration for a chemical reaction to actually takes place.

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Answer:

Household cleaners, antiseptics and battery juice are examples of toxic chemicals that you cannot consume because they have high acids concentrations. However some are very healthy such as critic acids found in oranges. :) Hope this helped.

Answer:

detail is given below.

Explanation:

This law was given by French chemist  Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.

Law of conservation of mass:

According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.

For example:

In given photosynthesis reaction:

6CO₂ + 6H₂O  → C₆H₁₂O₆ + 6O₂

The given equation is balanced chemical equation of photosynthesis. There are six carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of equation so this reaction followed the law of conservation of mass.

If equation is not balanced,

CO₂ + H₂O  → C₆H₁₂O₆ + O₂

It can not follow the law of conservation of mass because mass is not equal on both side of equation.

Answer:

Plasma.

Explanation:

In science, matter can be defined as anything that has mass and occupies space. Any physical object that is found on earth is typically composed of matter. Matter are known to be made up of atoms and as a result has the property of existing in states. The three (3) classical states of matter are;

I. Solid.

II. Liquid.

III. Gas

Plasma can be defined as a state of matter in which the electrons temporarily separate from the protons and as a result, it is generally referred to as the fourth (4th) state of matter due to its superheated nature.

Answer:

1.  

First of all, let's convert the energy of the absorbed photon into Joules:

The energy of the photon can be rewritten as:

where

h is the Planck constant

c is the speed of light

is the wavelength of the photon

Re-arranging the formula, we can solve to find the wavelength of the absorbed photon:

2. 1.24 eV

In this case, when the electron jumps from the n=4 level to the n=3 level, emits a photon with wavelength

So the energy of the emitted photon is given by the formula used previously:

and using

we find

converting into electronvolts,

Explanation:

Answer:

False

Explanation:

I took the quiz and got it right

Answer:

2, 2, 2, and 1

Explanation:

I put that in and it was correct.

Answer: in the daytime the sun is out so the stars are not visible becuase the suns reflection! At night When you gaze at the constellations, every star produces an image that's the same size, but your retina isn't sensitive enough to respond to the outer parts of those images except for the brighter stars — which therefore look bigger than the fainter ones.

Explanation:

This is what I found on goog.le a while ago now it might actually help if I’m wrong I apologiz, I hope this was your quistion!

Answer:

True

Explanation:

An element is pure substance that conatin only one type of atom

Answer:

true

Explanation:

the element hydrogen is made from atom

Answer:

it is called the prevailing westerlies

Explanation: