i need help guys hurry

Answer:

CUCO3_ CuO + CO2

Explanation:

exchange reaction occur when two soluble salts are mixed and immediately form an insoluble salt

The choose 4.

[tex]8.0 \times {10}^{5} - 9.2 \times {10}^{5} = - 1.2 \times {10}^{5} [/tex]

I hope I helped you^_^

Answer:Bunser buner

Explanation: It is meant to heat solid and liquid substance in the lab.

Explanation:

Add ethanol ( or whichever you choose) into the mixture.

Use a filter to separate the salt from mix.

Evaporate the ethanol/petroleum spirit -sugar mix to get the sugar by itself.

Done!

Answer:  1)  a) Use a magnet, or b) add to water abd scoop off the floating plastic beads

2)  Grind the leaf and solubilize what you can in water, then use filter paper as a chromatograph to separate the colors.

Explanation:

1)  Look for any property between the two substances that has a large enough difference to provide an avenue for separation.  Density is good, particle size also can be used, solubility, and magnetic properties, among others.

2)  https://www.britannica.com/science/paper-chromatography

continue at a constant speed)

The bowling ball will continue at a constant speed. In the case of a bowling ball rolling down a bowling alley, assuming there is no friction or other forces at play, the correct answer is: C.

According to Newton's first law of physics, also known as the law of inertia, an object will continue its current state of motion unless acted upon by an external force. If the initial motion of the ball is a roll with no external forces affecting it, it will maintain that rolling motion without accelerating, slowing down, or changing its direction. This is due to its inertia, a property of matter described by Newton's first law, which resists changes in motion unless compelled by an external force. Hence option C is correct.

To know more about Newton's first law, here

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Iron rusts when exposed to air → chemical property

Answer:Iron rusts when exposed to air.

Explanation:Which oh these statements describes a chemical property?

A. Iron melts at 1538 C.

B. Iron is attracted to a magnet.

C. Iron is a solid at room temperature.

D. Iron rusts when exposed to air.

Answer:  3.5 g/ml

Explanation:  The density does not change based on different volumes.  The mass changes, the density is still the same, from 0.5 ml to 2500 liters.  And below and beyond.  But if you give me the 2500 liter diamond, I'll do the measurement myself.

Answer:

3121.95 kilogram/cubic meter

Explanation:

I used an online calculator

Hope I helped!

Answer:

pick the second one I've done that test

Answer:

Criminology analyzes how crime affects the community or society as a whole , while forensic science analyzes individual crimes and evidence.

Answer:

Atom

Explanation:

atom: The basic unit of matter; the smallest unit of an element, having all the characteristics of that element; consists of negatively-charged electrons and a positively-charged center called a nucleus.

Answer:

no

Explanation:

Because I have lost and I dont know where is the worksheet

Por definición de porcentaje masa en masa, el porcentaje masa/masa de la solución es 20%.

En primer lugar, debes saber que una solución es una mezcla homogénea de dos o mas componentes, donde aquel que se encuentra en  mayor proporción se llama solvente y las demás sustancias se denominan solutos, que están disueltas en el disolvente.

La relación que existe entre la cantidad de soluto y la cantidad de disolvente recibe el nombre  de concentración.

Una de las unidades de concentración usadas es el porcentaje masa/masa. El porcentaje masa/masa (% m/m) indica la masa de soluto por masa de disolución. En otras palabras, el porcentaje en masa (o en peso) de una disolución es el número de gramos de soluto que hay por cada 100 gramos de disolución. Puede calcularse por la siguiente expresión:

[tex]Porcentaje masa en masa= \frac{masa soluto}{masa solucion}x100[/tex]

En este caso,

Reemplazando en la definición de porcentaje masa/masa:

[tex]Porcentaje masa en masa= \frac{20 g}{100 g}x100[/tex]

Resolviendo:

Porcentaje masa/masa= 20%

Finalmente, el porcentaje masa/masa de la solución es 20%.

Aprende más con este ejemplo: https://brainly.com/question/19540291?referrer=searchResults

The suggest units for each case are, respectively:

a) The distance between Chicago and Saint Louis - Kilometer.

b) The size of your bedroom - Meter.

c) The dimensions of this textbook - Centimeter.

d) The thickness of a hair - Micrometer.

Reminder - Question is incomplete, the complete statement is described below:

"The fundamental SI unit of length is meter. However, we often deal with larger or smaller length or distances for which multiplies or fractions of the fundamental units are more useful. For each of the following situations, suggest what fraction or multiple of the meter might be the most appropriate measurement:

a) The distance between Chicago and Saint Louis.

b) The size of your bedroom.

c) The dimensions of this textbook.

d) The thickness of a hair."

We can determine if a Unit is either a Multiple or a Fraction by using the following formula:

[tex]\frac{Q_{u}}{Q_{r}} = 10^{n}[/tex] (1)

Where:

[tex]Q_{u}[/tex] - Used unit, in meters.

[tex]Q_{r}[/tex] - Reference unit, in meters.

[tex]n[/tex] - Unit-to-unit factor, no unit.

A Measure has a Multiple of the Fundamental Unit if and only if [tex]n> 0[/tex], and it is a Fraction of the Fundamental Unit if and only if [tex]n < 0[/tex].

Now we proceed to analyze each case:

a) The distance between Chicago and Saint Louis - The Kilometer is the most common unit to measure Distance between Cities. A Kilometer has a Unit-to-unit factor of 3, representing a Multiple of the Meter.

b) The size of your bedroom - The Meter is the most common unit for Housing and Buildings. A Meter has a Unit-to-unit factor of 0, representing the Fundamental Unit itself.

c) The dimensions of this textbook - The Centimeter is the most common unit for dimensions of Books. A Centimeter has a Unit-to-unit factor of -2, representing a Fraction of the Meter.

d) The thickness of a hair - The Micrometer is the most common unit for the Thickness of a Hair. A Micrometer has a Unit-to-unit factor of -6, representing a Fraction of the Meter.

Then, the suggest units for each case are, respectively:

a) The distance between Chicago and Saint Louis - Kilometer.

b) The size of your bedroom - Meter.

c) The dimensions of this textbook - Centimeter.

d) The thickness of a hair - Micrometer.

Please see this question related to Length Units:  https://brainly.com/question/17575641

Answer:

A

Explanation:

Answer:

A supersaturated solution is unstable—it contains more solute (in this case, sugar) than can stay in solution—so as the temperature decreases, the sugar comes out of the solution, forming crystals. The lower the temperature, the more molecules join the sugar crystals, and that is how rock candy is created.

Answer:

A supersaturated solution is unstable—it contains more solute (in this case, sugar) than can stay in solution—so as the temperature decreases, the sugar comes out of the solution, forming crystals. The lower the temperature, the more molecules join the sugar crystals, and that is how rock candy is created.

This is correct because each piece of wood has the same composition.

Hope it helps! Please do comment

Answer:

12.5 gm

Explanation:

15 days is three half lives  

100 * (1/2)^3 = 12.5 grams

Answer:

1260 hours.

Explanation:

Assuming you meant for 180 days each year, it should come out to be the answer I got. :)

180 days × 7 hours per day = 1,260 hours per year

Answer:chemical

Explanation:

Answer: My opinion is that its a physical change

Explanation:

you can always add more coffee to make it hot

50 pints is equal to 6.25 gallons.

in order to convert pints to gallons, we need a conversion factor. The relationship between pints and gallons is 1 pt = 0.125 gal. The number of gallons equivalent to 50 pints are:

[tex]50pt \times \frac{0.125gal}{1pt} = 6.25 gal[/tex]

50 pints is equal to 6.25 gallons.

You can learn more about unit conversions here: brainly.com/question/19420601

About 2 gallons. (I got 1.92592592593)

Answer:

D: lose an electron

Explanation:

when an atom loses an electron it's positively charged and when it gain an electron it is negatively charged

Answer:b and c can both be dependent variables, but im going to say that its b

Explanation:

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Chemical transformation of a carbon-carbon double bond is the addition reaction.

Explanation:

Consequently, if the bond energies of the product molecules are greater than the bond energies of the reactants, the reaction will be exothermic.

hope it helps

Answer:

A solid

the internolecular forces are packed and leave no space behind

Answer:  Most elements don't have formulas.  

Explanation:  They exist as single atoms, witn no bonds to another atom.  A few element do exist as molecules, such as )2 and N2, but they are bonded to the same atom.  There are no different elements.

Answer:

A. primary

Explanation:

Answer:

C.

Tertiary

Explanation:

Answer:

Not all mixtures are solutions. A solution is a specific term that describes an even or homogeneous mixture of a solute, the substance being mixed, in a solvent, the substance that is in a greater amount in which the solute dissolves. All solutions are mixtures because it is two or more substances mixed together.