Answer:
2200J
Explanation:
Given parameters:
Specific heat of aluminum = 0.88J/g°C
Mass of nugget = 50g
Initial temperature = 20°C
Final temperature = 70°C
Unknown:
Quantity of heat required for the heating = ?
Solution:
To solve this problem, we use the expression below;
H = m c Δt
H is the quantity of heat
m is the mass
c is the specific heat capacity
Δt is the change in temperature
H = 50 x 0.88 x (70 - 20) = 2200J
Which square (A, B, C, or D) represents the repeating subunit of the polymer shown?
Answer:
c is the answer
Explanation: just answerd it and got it correct
How many Cl- bond with one Na+ ion?
please help me ill give brainliest if right
Answer:
3000kg
Explanation:
Given parameters:
Speed = 20m/s
Kinetic energy = 600000J
Unknown:
Mass = ?
Solution:
Kinetic energy is the energy due to the motion of a body.
It is expressed as;
K.E = [tex]\frac{1}{2}[/tex] m v²
m is the mass
v is the speed
Now find m;
600000 = [tex]\frac{1}{2}[/tex] x m x 20²
600000 = 200m
m = 3000kg
0.485 moles BaSO4 is equal to how many grams of BaSO4?
___ grams BaSO4
Which of these share chemical bonds
Mixtures
all matter
Compounds
Answer:
Compounds
Explanation:
All compounds of a substance shares chemical bonds between them and their structures.
The bonds can come in different forms. Compound are held by chemical bonds within their atoms.
Mixtures are composed of different atoms and compoundsThey are mostly not chemically bonded togetherMixtures can be separated by physical means because they lack bonds between them. Compounds are chemically bonded togetherHelp me answer this plz.
Answer:
87.58 L of C₂H₂
Explanation:
We'll begin by calculating the number of mole in 250 g of CaC₂.
This can be obtained as follow:
Mass of CaC₂ = 250 g
Molar mass of CaC₂ = 40 + (12×2)
= 40 + 24
= 64 g/mol
Mole of CaC₂ =?
Mole = mass /Molar mass
Mole of CaC₂ = 250 / 64
Mole of CaC₂ = 3.91 moles
Next, the balanced equation for the reaction. This is given below:
CaC₂ + 2H₂O —> C₂H₂ + Ca(OH)₂
From the balanced equation above,
1 mole of CaC₂ reacted to produce 1 mole of C₂H₂.
Next, we shall determine the number of mole of C₂H₂ produced by the reaction of 250 g (i.e 3.91 moles) of CaC₂. This can be obtained as follow:
From the balanced equation above,
1 mole of CaC₂ reacted to produce 1 mole of C₂H₂.
Therefore, 3.91 moles of CaC₂ will also react to produce 3.91 moles of C₂H₂.
Finally, we shall determine the volume of C₂H₂ produced from the reaction. This can be obtained as follow:
Recall:
1 mole of any gas occupy 22.4 L at STP.
1 mole of C₂H₂ occupied 22.4 L at STP.
Therefore, 3.91 moles of C₂H₂ will occupy = 3.91 × 22.4 = 87.58 L
Thus, 87.58 L of C₂H₂ is produced from the reaction.
Step1: Cl3 Cl2 +Cl Step2: Cl3+Cl 2Cl2 Which is the activated omplex for step 2?
Answer:
The answer is "[tex]\bold{Cl_4}[/tex]"
Explanation:
Please find the complete question in the attachment file.
In this question, it uses the Chemical equations, which is also known as the order to comply with the Law on Mass Conservation, substances must be balanced wherever volume cannot be generated or lost. This should be reacted that the reaction weight becomes equal to a product mass.
PLEASE HELP
The area in which you live has a particular climate. It also has weather. Which claim describes the difference between climate and weather?
Group of answer choices
Weather is determined by temperature and precipitation, whereas climate is determined only by humidity, air pressure, and wind conditions.
Climate is the condition of Earth’s atmosphere at a particular time and place, whereas weather is the characteristic climate in an area over a long period of time.
Climate is determined by temperature and precipitation, whereas weather is determined only by humidity, air pressure, and wind conditions.
Weather is the condition of Earth’s atmosphere at a particular time and place, whereas climate is the characteristic weather in an area over a long period of time.
Answer:
Weather is the condition of Earth’s atmosphere at a particular time and place, whereas climate is the characteristic weather in an area over a long period of time.
Explanation:
Weather and climate are two very important conditions that describes the atmospheric overview of a place.
Weather is reported over a short period of time, it is the condition of the atmosphere at a particular time and place.
Climate is reported over a long period of term. The average weather condition of a place over a long period of time is the climate.
The most important control over the climate of a place is the temperature and amount of precipitation it receives over a period of time. Weather conditions is reported using more diverse factors such a temperature, pressure, humidity, precipitation, etc.Which part of the atom determines how an element interacts in a chemical reaction?
Ansewer : nucleus
The number of protons in the nucleus determines which element an atom is, while the number of electrons surrounding the nucleus determines which kind of reactions the atom will undergo. The three types of subatomic particles are illustrated below for an atom of helium—which, by definition, contains two protons.
Match each CDE with the correct category it falls into.
Answer:
evaluation
Explanation: Big brain
name two solid liquid and gaseous element at the normal temperature and normal press
ure
Answer:
Solid: calcium and potassium
Liquid: mercury and bromine
Gaseous: oxygen and fluorine
Explanation:
Matter exists in three different states namely: solid, gaseous and liquid. Elements that are found in nature are classified as matter. Since, these elements are grouped as matter, they can either be found as either solids, liquids or gases at normal temperature and pressure.
At normal temperature (20°C or 293K) and pressure (1 atm), the following elements are found to exists in the respective state of matter:
Solid: Calcium (Ca) and potassium (K)
Liquid: Mercury (Hg) and bromine (Br)
Gaseous: Oxygen (O) and fluorine (F)
Please answer fast, shouldn't take long to do ^-^ (will give brainliest)
Which is the correct formula for iron (II) phosphate?
a. Fe2PO4
b. Fe3(PO4)2
c. Fe2PO3
d. Fe(PO4)2
e. Fe(PO3)2
Answer:
B
Explanation:
Do bases lose or gain hydrogen ions?
Help :-)
Answer:
Acids are classified in the Bronsted Lowry acid-base theory as species, which losses hydrogen ions (H+, known as protons) in a chemical reaction (and are foundation species that accept hydrogen ions).
What type od chemical reaction is the example below?
2 H2O2
2 H2O + O2
a
synthesis
combination
decomposition
single replacement
С
Answer:
Decomposition
Explanation:
One reactant has formed two products
Of the two bromoderivatives, C6H5CH(CH3)Br and C6H5CH(C6H5)Br which one is more reactive in SN1 substitution reaction and why?
Answer:
tertiary
Explanation:
tertiary halogenoalkanes are more reactive than primary and secondary as the carbocation is more stable due to alkyl groups( have high electron density) donating electrons to stabilise the carbocation
When a machine does work, a trade-off occurs. Which of the following best exemplifies this trade-off?
A. A pulley changes the direction of your force, but requires a greater input force.
B. A lever increases output force and the distance the load moves.
C. A wheel and axle increases output force and the distance the load moves.
D. A ramp allows you to decrease force, but requires a greater distance.
Answer:
A
A pulley changes the direction of your force, but requires a greater input force.
Explanation:
A pulley changes the direction of your force, but requires a greater input force when machine does work. so option A is correct.
What is machine ?Any tool that makes work easier is a machine. We can complete tasks with the aid of machines by using less force and energy.
By using a simple machine, you can move anything with less effort, but you have to move it farther to do the same amount of labor.
Our bodies function like machinery. For instance, our arms can be compared to a machine that can be utilized to quickly lift objects.
By using a machine to perform work, either the force or the distance across which the force is delivered may rise, but not both at once. In other words, as one grows, either force or distance, the other must decrease. The force-distance trade off is what is meant by this.
Thus, option A is correct.
To learn more about machine follow the link below;
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A 14.1g sample of NaOH is dissolved in 200.0g of water in a coffee-cup colorimeter. The temperature increases from 20.0C to —-. Specific heat of liquid water is 4.18 J/g-K and deltaH for the dissolution of sodium hydroxide in water is 44.4kj/mol.
Answer:
The temperature finally increased from 20 °C to 38.7 °C
Explanation:
This a problem about calorimetry. Formula to solve it is:
Q = m . C . ΔT
Where ΔT is Final T° - Initial T°
m is the mass
and C, specific heat.
In this situation we are dissolving NaOH where 1 mol requires 44.4 kJ of heat. As we do not have 1 mol, we need to determine the heat that is released.
We convert the mass to moles
14.1 g . 1 mol / 40g = 0.3525 mol
We determine the heat
0.3525 mol . 44400 J/mol = 15651 Joules of heat.
Now we can replace data in the calorimetry formula:
15651 J = 200 g . 4.18 J/g°C (Final T° - 20°C)
15651 J / (200 g . 4.18 J/g°C) = Final T° - 20°C
18.7°C + 20°C = Final T° → 38.7°C
how many electrons does fluorine take
Answer:
Fluorine has nine electrons
Do acids lose or gain hydrogen ions?
Help
please
Answer: They lose them :)
Explanation:
PLZ HELP
11 and 12 :)))
Answer:
Explanation:
number 12 is magnesium i think which is group lla which is B alkaline earths
Which of these elements could gain one electron to form an ionic bond with potassium explain why
Answer:
ChlorineIt has 7 electrons in it last shell. it will gain one electron to complete its octet and become Cl-. The ionic bond of chlorine form with potassium is Kcl ( potassium chloride)
Phosphorus has 5 electrons in its last shell it need 3 more electron to stable .Sulphur has 6 electron. it needs 2 electrons Argon is already stable as it has 8 electrons in its last shell it will not gain or loose any electronsTo solve such this we must know the concept of ionic reaction. Cl is the element could gain one electron to form an ionic bond with potassium.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound.
Potassium will act as cation as K⁺, chlorine has 7 electrons in it last shell, it can gain one electron to complete its octet and become Cl⁻. The ionic compound of Cl with K is KCl.
Phosphorus has 5 electrons in its last shell it so, it needs 3 more electron to get stable .Sulphur has 6 electron, it needs 2 electrons to get stable. Argon is already stable as it has 8 electrons in its last shell so, it will not gain or loose any electrons.
Therefore, Cl is the element could gain one electron to form an ionic bond with potassium.
Learn more about the chemical reactions, here:
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A chemist was working on a new treatment for nonliving infectious agents that are not curable. What type of infectious agent is the new medicine for?
A. Virus
B.Fungus
C.Parasite
D.Bacteria
Answer: D: bacteria
Explanation:
Which of the following elements has the highest electronegativity?
*potassium
*lithium
*chlorine
*oxygen
Name the following molecules:
P4S5______________________________________________
CH4______________________________________________
NF3 ______________________________________________
N2O______________________________________________
30 points please help!!!!!!!!
pH 3 = 10 times of pH 4 in terms of H⁺ concentration
Further explanationpH is the degree of acidity of a solution that depends on the concentration of H⁺ ion. The greater the value the more acidic the solution and the smaller the pH.
pH = - log [H⁺]
So that the two quantities between pH and [H⁺] are inversely proportional because they are associated with negative values.
A solution whose value is different by n has a difference in the concentration of H⁺ ion of 10ⁿ.
So pH 3 and pH 4 have a difference in the concentration of H⁺ ion of 10¹ = 10
pH 3 = -log[10⁻³]
pH 4 = - log[10⁻⁴]
pH 3 = 10 times of pH 4 in terms of H⁺ concentration
And pH 3 is stronger in acid than pH 4
Why is the organization of the periodic table by physical properties not very useful?
Answer:
It shows no regular pattern
Explanation:
Physical properties of an element are those we can observe and feel with our senses. Also, the use special equipment can enhance our perception of these properties.
The same physical property can be shared different number elements. On the periodic table, all the elements in group 1 and 2 are metals. This is not very useful for scientists whose emphasis is to distinguish one atom from the other. Therefore, physical properties are highly limited in the organization of the periodic table.A sample of neon gas occupies a volume of 752 mL at
298K. What volume will the gas occupy at 320.K?
please helppppp
Answer:
815mL am 10000000% sure
When a mixture of oxygen and hydrogen is ignited in a test tube, the reaction shown occurs. Hydrogen + Oxygen → Water + Energy Substances that form as a result of a chemical reaction are called catalysts catalysts products products precipitates precipitates reactants
Answer:
products
Explanation:
In chemistry, chemical reactions is the combination of two or more substances to yield other substances. The substances that react is called REACTANTS while the substances formed after the reaction is called PRODUCTS.
According to this question, a mixture of oxygen and hydrogen is ignited in a test tube as follows:
Hydrogen + Oxygen → Water + Energy
In this reaction, the substances being combined (usually found on the left side of the equation) are hydrogen and oxygen. Hence, oxygen and hydrogen are REACTANTS. Also, the substances produced as a result of the reaction is water (H2O). The PRODUCTS of the reaction is WATER.
Answer:
Soy isk polq ja uso??
Explanation:
Na uend qoaki uwsh.. aju qah!
Consider the following incomplete reaction. Mg + 2Y ---> MgCl₂ + H₂ Choose the formula for the missing substance Y.
A. H₂Cl
B. HCl
C. Cl
D. Cl₂
Which of the following is NOT an example of potential energy?
A. car moving down the highway
B. log on a fire
C. person standing on a diving board
D. liter of gasoline
Answer:
A. car moving down the highway
Explanation:
Potential energy is when the energy is being held in, as in, it is very still, and not moving.
When a car is moving down a highway, it is releasing kinetic energy, instead of potential.