A truck traveled at a constant speed for 6 hours. Then, it
decreased its speed by 13 mph for the remaining 228 miles. If
the total distance was 876 miles, how long did it take to travel
the remaining 228 miles?
h

Answer:

The history of water supply and sanitation is one of a logistical challenge to provide clean water and sanitation systems since the dawn of civilization. Where water resources, infrastructure or sanitation systems were insufficient, diseases spread and people fell sick or died prematurely.

Explanation:

Answer:

J.J.Thomson discovered negatively charged particles by cathode ray tube experiment in the year 1897. The particles were name electrons.

Answer:

Shift it to the right toward the products,

Explanation:

Adding more reactant will increase the concentration of the reactants, to offset this increased concentration, more products will be formed.

Answer:

vinegar is acidic

water should be neutral but people say since it's pH 7,it will be more alkaline

salt solution is acidic

lemon juice is acidic

sugar solution is alkaline

soap is alkaline

Methyl orange will turn red with grapefruit juice.

Methyl orange will turn yellowish orange or lemme say red with oven cleaner

The addition of pure water to methyl orange will not have an effect on the color and the solution will still be around neutral pH and yellow in color.

Explanation:

Working on number 7

Answer:Consider the reaction N2(g) + 3H2(g) =; 2NH3(g). If hydrogen gas is added to this system at equilibrium, will the reaction shift towards reactants

Answer: 8.31

Explanation: they told me it was correct

The value of R for 4.00 moles of an ideal gas at 25°C, 100L of volume and pressure of 99.1 kPa is 99.1 kPa.L / mol.°C.

Ideal gas equation is a hypothesis which tells about the behavior of gas at different conditions and it is represented as:

PV = nRT, where

P = pressure of ideal gas = 99.1 kPa

V = volume of ideal gas = 100 L

n = moles of ideal gas = 4 moles

T = temperature ideal gas = 25 °C

R = universal gas constant = ?

On putting these values on the above equation, we get

R = (99.1)(100) / (4)(25)

R = 99.1 kPa.L / mol.°C

Hence value of R for ideal gas is 99.1 kPa.L / mol.°C.

To know more universal gas constant, visit the below link:

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Answer:

I had a amazing thanksgiving thanks for asking

Explanation:

Answer:

b). silver (Ag)

Explanation:

If you look at the periodic table, you just need to look at the atomic number of the element, because the atomic number tells you how many protons there are in the nucleus of the element.

But do be careful because some periodic tables have the molar mass at the top left corner, but the one I use has the atomic number at the top left corner, so make sure you look for the atomic number and not the molar mass.

Answer:

A pure metal is any metal that has not been joined with any other metal

Explanation:

Answer:

Be cause of The fat

Explanation:

It’s just fat

Answer: 1169.298 L

Explanation: In order to go from grams to liters, you must find the moles first using the molar mass, 62.068 g/mol (found via google search). I will assume the ethylene glycol is in gas form so we can use the 22.4 L per mol conversion.

Using dimensional analysis, starting with the kg, we must convert to grams, then moles, then liters.

[tex]\frac{3.24 kg}{} * \frac{1000g}{1 kg} * \frac{1 mol}{62.068 g} * \frac{22.4 L}{1 mol}[/tex]

Multiply the top individually, then the bottom individually.

[tex]\frac{72576}{62.068}[/tex]

Divide out.

[tex]= 1169.298 L[/tex]

In the end, we get 1169.298 L of ethylene glycol.

Answer:

bromine, iodine, chlorine, flourine

Explanation:

thdy are all diatomic elements- meaning they can only exust with 2 elements. other diatomic elements include: (theres 7 btw)

-Bromine

-Iodine

-Nitrogen

-Chlorine

-Hydrogen

-Oxygen

-Flourine

Answer:

a

Explanation:

is my lucky guess im sorry if im wrong good luck

Answer:A

Explanation: because The nucleus directs all of the cell's activities, including reproduction.

Answer:

Explanation:

The correct answer is sodium (Na)

Answer:

false

Explanation:

Answer:

How to differentiate between physical and chemical change?

Physical and Chemical Changes to Matter

Physical changes only change the appearance of a substance, not its chemical composition.

Chemical changes cause a substance to change into an entire substance with a new chemical formula.

Chemical changes are also known as chemical reactions.

Answer:

D

Explanation:

Answer:

138g

Explanation:

According to this question, sodium reacts with chlorine to form sodium chloride as follows:

Na(s) + Cl(g) → NaCl (aq)

According to the law of conservation of mass, matter can neither be created nor destroyed, but can only be transferred from one form to another. This means that the mass of the reactants in a chemical reaction must equate the mass of products of that reaction.

Hence, If 76g of sodium reacts with chlorine to produce 214g of sodium chloride, this means that to obey the law of conservation of mass, the mass in grams of chlorine that reacted is 214g - 76g = 138g

In this sense, the combined 76g of sodium and 138g of chlorine (reactants) will equate the 214g of sodium chloride (products) in obeisance to law of conservation of matter.

Answer:

107.9g

Explanation:

Given parameters:

Molar mass of Cu  = 63.5g/mol

Molar mass of Ag  = 107.9g/mol

Mass of reacting Cu  = 31.75g

Unknown:

Mass of Ag produced  = ?

Solution:

The reaction equation is given as;

    Cu + 2AgNO₃ →  Cu(NO₃)₂ + 2Ag

The equation is balanced.

We start by find the number of moles of the known;

  Number of moles  = [tex]\frac{mass}{molar mass}[/tex]  

  Number of moles of Cu  = [tex]\frac{31.75}{63.5}[/tex]   = 0.5moles

From the balanced equation;

       1 mole of Cu produced 2 moles of Ag;

      0.5 mole of cu will produce 0.5 x 2 mole of Ag  = 1 mole of Ag

Now;

 Mass of Ag  = number of moles x molar mass

 Mass of Ag  = 1 mole of Ag x 107.9g/mol  = 107.9g

Answer:

107.9

Explanation:

Answer:true

Explanation:

This statement is correct

Answer:

1. Students need to measure masses of the items.

2. Put baking soda and vinegar in a plastic bag and close it.

3. Mix the two, allowing for a reaction to occur.

4. Figure the mass of the plastic bag while the two components are inside.

5. The combined mass should be equal to what each weighed on their own.

Explanation:

total mass of the products is equal to the total mass of the reactants

The law of conservation of mass states that the total mass of the products must be equal to the total mass of the reactants , during a chemical reaction.

10 g baking soda, 30 mL vinegar, an electronic balance, and a resealable plastic bag .

CH3COOH + NaHCO3 = CH3COONa + CO2 + H2O

1. Since we now the amount of baking soada and that of vinegar,, we weigh the plastic bag.then Pour the  baking soda into the vinegar in a plastic bag and close it.

2. We mix the two by rubbing the plastic bag for proper mixing and  the reaction to occur.

3.The reaction forms sodium acetate, with the the evolution of trapped co2 gas and water.

 4. we weigh the plastic bag together with the products formed inside the  

We would find out that  The combined mass of the products would be equal to what each component weighed  on its  own.

Mass of reactants (baking soda + vinegar) = Mass of products (Sodium acetate + Carbon dioxide+ water)

See here on conservaton of mass:https://brainly.com/question/15655730

Answer:

The number of protons in the nucleus of the atom is equal to the atomic number (Z).

The number of electrons in a neutral atom is equal to the number of protons.

Hope it worked

Answer:

A). An atom is an indivisible hard-sphere.

Explanation:

The 'Atomic Theory' of Dalton is characterized as the earliest model(came in 1803) which described the atoms as the indivisible and resistant spheres. He used the example of watermelon to elaborate that the atoms of a specific element share similar characteristics and the atoms of distinct elements differ in their mass as well as their size. Thus, option A is the correct answer.

The statement that describes the earliest model of the atom is: A. An atom is an indivisible hard sphere.

An atom can be defined as the smallest, indivisible, basic unit of matter that forms all chemical elements.  Thus, an atom is the fundamental (basic) building blocks of matter i.e all physical and chemical substances.

Additionally, an atom defines or determines the structure of a chemical element.

Basically, an atom comprises three (3) main particles and these are;

The earliest (first model) of an atom was proposed by a notable English chemist called John Dalton. In the early 1800s, John Dalton adopted Democritus' theory to formulate the earliest (first model) of an atom.

Dalton's atomic theory described the atom of a chemical element as an impenetrable, movable, indivisible, very small (tiny) but movable hard sphere i.e it cannot be divided into subatomic or very tiny particles.

Read more: https://brainly.com/question/13184883

Answer:

Explanation:

Cobalt bromate is the name of this compound

The name of the given compound is Cobalt(III) bromate.

Explanation:

While naming compounds of a transition element :

Given

The molecule formula of a compound[tex]Co(BrO)_3[/tex]:

To find:

The name of the given compound formula

Solution:

The charge on the cobalt ion = +3

The charge on the bromate ion = -1

Cation in formula = [tex]Co^{3+}[/tex] = Cobalt cation

Anion in the formula= [tex]BrO^{-}[/tex] = Bromate ion

So, the name of the given compound is Cobalt(III) bromate.

Learn more about the naming of compounds here:

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Answer:

It all really depends on the side group the amino acid is on! For instance, out of the  20 side groups used to make proteins, there are only two main groups: polar and non-polar

Answer:

The water absorbs the thermal energy of the fire.

Explanation:

Thermal energy a form of energy that is produced when a rise in temperature causes atoms and molecules to move faster and collide with each other. It is a form of energy which involves the transfer of energy from regions of higher heat content to regions of lower heat content.

A burning wood fire has a higher heat content than water. Therefore, when water is thrown on a wood fire, the water will absorb the heat from the burning wood fire in order to raise its own heat content. since the wood fire has lost heat to water, it would eventually stop burning, whereas the water whose heat content has been raised may have some of its molecules absorbing so much heat that a change of phase occurs to the liquid phase.

Answer:

Oxide of manganese, Potassium permanganate, Manganese bromide and manganese oxide.

Explanation:

1. Manganese dioxide

Its chemical formula is [tex]$MnO_2$[/tex]. It is +4 oxidation state. It is a black solid which is fairly stable.

2. Potassium permanganate

Its chemical formula is [tex]$KMnO_4$[/tex]. It is commonly used in the laboratories as oxidizing agent. They appear black in color.

3 Manganese bromide

Its chemical formula is [tex]$MnBr_2$[/tex]

4. Oxides of manganese

Chemical formula is [tex]$Mn_3O_4$[/tex]

The most stable state of Manganese is +2 oxidation state.