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Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

mass = Density × volume

From the question we have

mass = 75 × 2.86

We have the final answer as

Hope this helps you

Answer:

brainly

Explanation:

Adjust your day-to-day behaviors.

Replace your light bulbs.

Use smart power strips.

Install a programmable or smart thermostat.

Purchase energy efficient appliances.

a proton is a type of particle with a positive charge and an electron is a particle with a negative charge. neutrons ould be a neutral particle.

Answer:

Air is a mixture. Its constituents can be separated. For example: oxygen, nitrogen etc.

Hydrochloric acid is a mixture, being an acidic liquid.

Answer:

B) It will decrease because fewer particles will have the required activation energy.

Explanation:

Temperature is one of the important factors that affect the rate of a chemical reaction. An increase in the temperature of a reaction will cause the reactants to gain more kinetic energy and hence, reduce the energy required for reactants collision (start) to occur i.e. activation energy.

Note that, once the activation energy is reduced, the rate of reaction is increased. In this case, the temperature of a reaction vessel with liquid reactants is lowered to one-third (1/3) of the original temperature. Due to a reduction in the reaction's temperature, the rate of reaction will also decrease because fewer particles will have the required activation energy.

Answer:

B. It will decrease because fewer particles will have the required activation energy.

Explanation:

I took the text :)

Answer:

The correct option would be 'electrons

Explanation:

Answer:

[tex]Amount\ of\ Grams = 0.2644 g[/tex]

Explanation:

Given

Element: Sodium

[tex]Atoms = 6.92 * 10^{21}[/tex]

Required

Determine the amount of grams

We start by solving for the number of moles

[tex]Moles = \frac{Sodium\ Atoms}{Avogadro\ Number}[/tex]

[tex]Avogadro\ Number = 6.022 * 10^{23}[/tex]

So, we have:

[tex]Moles = \frac{6.92 * 10^{21}}{6.022 * 10^{23}}[/tex]

[tex]Moles = \frac{6.92 * 10^{21-23}}{6.022}[/tex]

[tex]Moles = \frac{6.92 * 10^{-2}}{6.022}[/tex]

[tex]Moles = 1.15 * 10^{-2}[/tex] moles

Next, we calculate the amount of grams.

Mass per mol of Sodium = 22.98977g/mol

For [tex]1.15 * 10^{-2}[/tex] moles of sodium

[tex]Amount\ of\ Grams = 1.15 * 10^{-2}\ mol * 22.98977g/mol[/tex]

[tex]Amount\ of\ Grams = 1.15 * 10^{-2} * 22.98977g[/tex]

[tex]Amount\ of\ Grams = 0.264382355 g[/tex]

[tex]Amount\ of\ Grams = 0.2644 g[/tex] (approximated)

Hence, there are 0.2644g of sodium in [tex]6.92 * 10^{21}[/tex] atoms

Answer:

HF is an acid as it losses hydrogen into the sollution on hydrolysis.

Explanation:

Incomplete question. Options;

A) Mass is created and energy is released.

B) Mass is created and energy is stored.

C) Mass is converted to energy, which is released.

D) Mass is converted to energy, which is stored.

Answer:

Mass is converted to energy, which is released

Explanation:

Basically, when uncontrolled nuclear fission (splitting) occurs, a radioactive atom (a mass) is split into two smaller nuclei leading to a continuous chain of fission reactions.

In other words, as the fission of the mass of the atom continues to occur, the mass is converted to energy, which is then released and more reactions occur.

Answer:

Q = 2.415kj

Explanation:

Q = Mc∆temperature

c = 0.46j/g°c = 0.46kj/kg°c

mass = 150g = 0.15kg

∆temperature = 60 - 25 = 35°c

Q = 0.15 X 0.46 X 35 = 2.415kj

Q = 2.415kj

Answer:

Electricity is made at a generating station by huge generators. The current is sent through transformers to increase the voltage to push the power long distances.  The electrical charge goes through high-voltage transmission lines that stretch across the country.

Answer:

I THINK IT MIGHT  BE B

Explanation:

Answer:

i think a or b

Explanation:

Answer:

4. Another element is formed with greater atomic number​

Explanation:

Ions only have a different amount of electrons and have the same amount of protons and neutrons.

Isotopes only have a difference in neutrons.

However, only a difference in protons will make another element.

Hence, 4 is the answer.

Hope this helped!

Explanation:

Atomic radius decreases from left to right in a period.

Therefore Calcium would have a smaller atomic size.

Answer:

V = 29.3 inch³

Explanation:

Given data:

Diameter of cone = 4 inch

Height of cone = 7 inch

Volume of cone = ?

Solution:

Formula:

V = πr²h/3

we calculate the radius from diameter,

r = 4 inch/2 = 2 inch

Volume:

V = 3.14 ×(2 inch)²  × 7 inch/3

V = 3.14 × 4 inch² × 7 inch/3

V = 29.3 inch³

Explanation:

For the two samples, the mass and volume of the foil are different but irrespective of this, the density of the aluminum foil will remain the same.

Mass depends on the amount of matter present and as given in the description, the sample with a high number has more mass.

Volume is the amount of space a substance occupy.

Answer:

amount of matter

Explanation:

Answer:

the variable A represented specific heat capacity

Answer: The Variable T

Explanation:

Answer:

You could observe the cell wall in all kingdoms except for the animals. That would be cells of plants, protists (algae), fungi, bacteria and achaea.

It ISNT occurs in substances that have discrete molecular structure

Explanation:

I took the test and got this wrong

Answer:

Nitrogen-15

Explanation:

To use the correct notation, you need to use the mass number.  The mass number is the number of protons plus the number of neutrons.  Nitrogen has 7 protons.  This isotope of nitrogen has 8 neutrons.

The correct notation is nitrogen-15.

Answer:

100

Explanation:

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Answer:

False

Explanation:

It is absolutely false that as the river's slope increases the power of the river to cause erosion usually decreases.

The right statement is vice versa because as the slope of the river increases, the ability of the river to cause erosion increases.

Answer:

false

Explanation:

just cause its right and i took the test

Answer:

So the number of protons equals the number of electrons.

Explanation:

Ionic bond, also called an electrovalent bond, type of linkage formed from the electrostatic attraction between oppositely charged ions in a chemical compound. Such a bond forms when the valence (outermost) electrons of one atom are transferred permanently to another atom.

Answer: The correct formula is [tex]MgBr_2[/tex]

Explanation:

For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.  

Here magnesium is having an oxidation state of +2 called as [tex]Mg^{2+}[/tex] cation and bromine [tex]Br^{-}[/tex] is an anion with oxidation state of -1. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral [tex]MgBr_2[/tex].

The cations and anions being oppositely charged attract each other through strong coloumbic forces and form an ionic bond.

The mass of the silver : 4.6 g

Heat can be calculated using the formula:  

Q = mc∆T  

Q = heat, J  

m = mass, g  

c = specific heat, joules / g ° C  

∆T = temperature difference, ° C / K  

∆T = temperature difference :

[tex]\tt 46-22=24^oC[/tex]

The specific heat of silver is  0.235 J/gºC

Q = heat = 26 J

The mass :

[tex]\tt mass(m)=\dfrac{Q}{c.\Delta T}\\\\m=\dfrac{26}{0.235\times 24}\\\\m=4.6~g[/tex]

Answer:

there is 7 periods and 18 groups

Explanation:

The answer is 87.62 u

Answer:

Atomic number: 38

Electrons per shell: 2,8,18,8,2

Symbol: Sr