Answer:
This question is incomplete
Explanation:
The question is incomplete without the options. However, when a metal (in this case what the pennies are made of) is left in direct contact with the heat from the sun, it conducts this heat and becomes hot. This process is called thermal conduction. The thermal energy is readily accepted by the material in which the pennies are made of thereby increasing the thermal energy of the penny coin which then makes the pennies hot after being left under the sun.
Name the gas evolved when Zn reacts with dil.HCI (choose the answer from the following)
1. O2 2. H2 3. CO2 4. Cl2
Answer:
H₂
Explanation:
The most common physical state of the elements is
Answer: Solids, gases, or liquids
Explanation:
Matter can undergo physical and chemical changes called Phase Changes. Substances are classified based on physical states, often referred to as the States of Matter. At room temperature and pressure the common Physical States of elements are solids, gases or liquids.
Most are solids only 11 are gases and 2 are liquids
The most common physical state of elements in the periodic table is Solids as there are about 84 elements which exists as solids at room temperature and pressure in the periodic table
Elements in the periodic table can exist as one of the prominent physical states at room temperature and pressure.
These physical state may be;
SolidLiquidor GasElements which are solid at Room Temperature are about 84.At room temperature and pressure, only two elements are existent in liquid phase are: Bromine. Mercury.A look at the periodic table evidently tells that there are 11 elements in the table that exist in the gaseous state at room temperature and pressure.These elements are Hydrogen, Helium, Nitrogen, Oxygen, and the other Noble gases.
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Determine the number of moles of 725.0 g of BaSO4
Answer:
It would be 3.1063937724731447 moles.
Hope this helps :)
Use the rules of significant figures to report the answer to this math question: (5.003 x 10^4) - (6.059 x 10^3) + (9.23 x 10^2) =
Answer:
44894
Explanation:
please help this is due in 30 minutes!!
Answer:
Hello. The answer is A (10)
Explanation:
If you memorize the periodic table it will be very easy to answer.
But if you don't know،
The solution is to count the electrons number
In an atom usually electrons number is equal with protons number
In this shape there are 10 electrons
So there are 10 protons in nucleus.
What is Mercury's proximity to the sun
PLEASE HELPP
Answer:
46.943 million km
Explanation:
From an average distance of 36 million miles (58 million kilometers), Mercury is 0.4 astronomical units away from the Sun.
From an average distance of 36 million miles (58 million kilometres), Mercury is 0.4 astronomical units away from the Sun.
(I hope this helped ^^)
HELP!!!
write the scientific names of these ionic compounds
Answer:
• Copper chloride
• Copper (II) chloride
• Iron (II) sulfide
• Iron (III) sulfide
Brownian motion is
A. random movement of particles suspended in a fluid
B. movement of particles from an area of high concentration to low concentration
C. movement of particles from an area of low concentration to high concentration
D. random movement of smaller particles
Answer: A.
Explanation:
Brownian motion is the random motion of a particle as a result of collisions with surrounding gaseous molecules. Diffusiophoresis is the movement of a group of particles induced by a concentration gradient. This movement always flows from areas of high concentration to areas of low concentration.
Example: The movement of pollen grains on still water. Motion of dust motes in a room (though largely influenced by air currents).
Un compuesto formado por carbono, hidrógeno y oxígeno tiene una masa de 4,6 g. Se hace reaccionar con 9,6 g de oxígeno dando 8,8 g de CO2 y 5,4 g de agua. Si cogemos 9,2 g de un compuesto en un volumen 5,80l en P= 780 mmHg a una temperatura de 90ºC. Calcula la fórmula empírica y molecular.
Answer:
La fórmula empírica y molecular es: C₂H₆O.
Explanation:
Para calcular la formula empírica y molecular del compuesto debemos primero plantear la reacción:
[tex] C_{x}H_{y}O_{z} + O_{2} \rightarrow CO_{2} + H_{2}O [/tex]
Necesitamos encontrar "x", "y" y "z". Para ello, tenemos que recordar que la masa de carbono e hidrógeno producida está relacionada con la cantidad de C y H inicial (del compuesto):
Para el H:
CHO → H₂O
y 5,4g
[tex] \frac{2*1 g}{18 g} = \frac{y}{5,4 g} \rightarrow y = 0,6 g [/tex]
Para C:
CHO → CO₂
x 8,8g
[tex] \frac{12 g}{44 g} = \frac{x}{8,8 g} \rightarrow x = 2,4 g [/tex]
Para el O:
[tex] z = 4,6 g - 2,4 g - 0,6 g = 1,6 g [/tex]
Ahora mediante el calculo de los moles del C, H y O podemos encontrar la fórmula empírica:
Para el H:
[tex] n_{y} = \frac{m}{Pm} = \frac{0,6 g}{1 g/mol} = 0,6 moles [/tex]
Para el C:
[tex] n_{x} = \frac{m}{Pm} = \frac{2,4 g}{12 g/mol} = 0,2 moles [/tex]
Para el O:
[tex] n_{z} = \frac{m}{Pm} = \frac{1,6 g}{16 g/mol} = 0,1 moles [/tex]
[tex] C_{\frac{n_{x}}{n_{z}}}H_{\frac{n_{y}}{n_{z}}}O_{\frac{n_{z}}{n_{z}}} = C_{\frac{0,2}{0,1}}H_{\frac{0,6}{0,1}}O_{\frac{0,1}{0,1}} = C_{2}H_{6}O_{1} [/tex]
Entonces, la fórmula empírica del commpuesto formado es C₂H₆O.
Ahora para determinar la fórmula molecular podemos usar la siguiente relación:
[tex] \frac{Pm}{Pm_{e}} = n [/tex]
[tex] F_{m} = n*F_{e} [/tex]
[tex] F_{m} = \frac{Pm}{Pm_{e}}*F_{e} [/tex]
En donde Fm (fórmula molecular) y Fe (fórmula empírica) están relacionadas por n.
El valor de Pm lo obtenemos de la ecuación del gas ideal:
[tex]PV = nRT = \frac{m}{Pm}RT[/tex]
[tex] Pm = \frac{mRT}{PV} = \frac{9,2 g*0,082 L*atm/(K*mol)*(90 + 273 K)}{1.02 atm*5,80 L} = 46,3 g/mol [/tex]
[tex] F_{m} = \frac{46,3 g/mol}{(2*12 + 6*1 + 16)g/mol}*C_{2}H_{6}O_{1} = 1.00*C_{2}H_{6}O_{1} = C_{2}H_{6}O_{1} [/tex]
Por lo tanto, la fórmula molecular es la misma que la fórmula empírica, a saber C₂H₆O.
Espero que te sea de utilidad!
For the reaction 2NH3(g)↽−−⇀3H2(g)+N2(g) 2 NH 3 ( g ) ↽ − − ⇀ 3 H 2 ( g ) + N 2 ( g ) the equilibrium concentrations were found to be [NH3]=0.250 M, [ NH 3 ] = 0.250 M, [H2]=0.300 M, [ H 2 ] = 0.300 M, and [N2]=0.750 M. [ N 2 ] = 0.750 M. What is the equilibrium constant for this reaction? c= K c =
Answer:
0.324
Explanation:
The following data were obtained from the question:
Concentration of NH3, [NH3] = 0.25 M
Concentration of H2, [H2] = 0.3 M
Concentration of N2, [N2] = 0.75 M
Equilibrium constant (Kc) =.?
The balanced equation for the reaction is given below:
2NH3 <==> 3H2 + N2
The equilibrium constant, Kc for a given reaction is the ratio of the concentration of the products raised to their coefficient to the concentration of the reactants raised to their coefficient. Thus, the equilibrium constant for the above reaction can be obtained as illustrated below:
Kc = [H2]³ [N2] / [NH3]²
Concentration of NH3, [NH3] = 0.25 M
Concentration of H2, [H2] = 0.3 M
Concentration of N2, [N2] = 0.75 M
Equilibrium constant (Kc) =.?
Kc = [H2]³ [N2] / [NH3]²
Kc = [0.3]³ × [0.75] / [0.25]²
Kc = (0.027 × 0.75) / 0.0625
Kc = 0.02025 / 0.0625
Kc = 0.324
Therefore, the equilibrium constant for the reaction is 0.324
A 5.0 milliliter sample of a substance has a mass of 12.5 grams. What is the mass of a 100 milliliter sample of the same substance?
Answer:
It sould be 250 grams
Explanation:
It is given that, 5 millimeter sample has the mass of 12.5 grams. Then, 100 millimeter sample have a mass of 250 g.
What is mass ?Mass of a substance is a physical quantity that describes the total amount of the substance. Mass is an extensive property since it depends on the change in amount or quantity of the substance.
The SI unit of mass is grams (g). Other units are kilograms, milligrams , pounds etc. Mass is of small substance is expressed in grams and that bigger things are usually expressed in kilograms.
Given that mass of 5 ml sample = 12.5 grams
then mass of 1 ml = 12.5/5 = 2.5 g
then mass of 100 ml = 2.5 × 100 = 250 grams.
Therefore, the mass of 100 ml of the sample is 250 g.
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GIVING 5 STARS AND BRAINLIEST IF YOU ANSWER FIRST AND CORRECTLY!! This is due today... so please help. Thank you.
QUESTION:
How many atoms does H2SO4 have?
Answer:
2 Hydrogen atoms, 1 Sulfur atom and 4 oxygen atoms.
Explanation:
H has a 2 next to it. S has no number assigned to it meaning it represents 1 atom. Lastly, O has a 4 next to it.
Hope this helps!!
Answer:
7
Explanation:
2 hydrogen atoms. 1 Sulphur atom. And 4 Oxygen atoms.
The superscript 2 and 4 show how many of the element are there.
Which ice cream rather have Chocolate- Mint or Cookie IN' Cream?
Answer:
Cookies N Cream
Explanation:
Its The
Please i need to pass this!
Please try
It is incorrect because it should have a total of eight electrons with two electrons between each H and O
Further explanationLewis structure shows the form of bonds that occur in the valence electrons of an element or compound
This bonding usually occurs in covalent bonds
Valence electrons are electrons used in a chemical bond
The main group elements usually have valence electron configurations in the ns and np subshells, While the transition elements in the subshells (n-1) d and ns.
Element O has 6 valence electrons
Element H has 1 valence electron
To achieve stability, the element O needs 2 more electrons which are obtained from 2 electrons from the H element, while the H element needs 1 electron to be stable
So that a covalent bond is formed
Please help brainiest
Answer:
D.) Formulas l, ll, and lV
Explanation:
Formula l, ll, and lV all have 2 oxygen atoms. Formula lll have 4 oxygen atoms and forumula V has 6 oxygen atoms.
Which term describes erosion?
A.creates small particles
B. Hardens rock fragments
C. Transports solid materials
D. dissolves rock components
Which of the following statements is true?
a) Carbon dioxide is easier to compress than water.
b) Plasma is made of free electrons, ions, and neutral atoms.
c) Bose-Einstein condensates form at very cold temperatures.
d) All of the above.
Answer:
All of the above
Explanation:
I know about the first two choices but not so much about the last one
If the diameter of the black marble is 3.0 cm, and by using the formula for volume, what is a good approximation of its volume? Record to the ones place
Answer:
V = 21.2 cm³
Explanation:
Given data:
Diameter of block = 3.0 cm
Volume of block = ?
Solution:
Formula:
V = 2πr³
First of all we will calculate the radius from diameter.
r = d/2
r = 3.0 cm/2
r = 1.5cm
V = 2(22/7) (1.5cm)³
V = 2(3.14) (3.375cm³)
V = 21.2 cm³
3. The nucleus:
a. controls all the cell activities
b. controls only part of the cell
c. does not have any activity
Answer:
a. controls all the cell activities.Thank you ☺️
Question 3 (1 point)
Which of the following elements is the most electronegative: arsenic, phosphorus,
sulfur, or selenium?
selenium
arsenic
phosphorus
sulfur
Answer:
sulfur
Explanation:
From the given lists of elements, the one with the most electronegativity is Sulfur.
Electronegativity is of an element is a property that combines the ability of its atom to lose and gain electrons.
It is a measure of the relative tendency with which the atoms of the element attract valence electrons in a chemical bond.
Using the Pauling's electronegative table of elements;
Here are electronegativity values of the given elements;
selenium 2.4
arsenic 2.0
phosphorus 2.1
sulfur 2.5
We see that the value of sulfur is the highest.
Pls help solving question (d)!!
Answer: 1 C4H6O3 + 1 H2O -> 2 C2H4O2
Explanation:
LEFT HAND SIDE:
C= 4
H=8
O= 4
RIGHT HAND SIDE:
C= 2
H= 4
O= 2
You want the left side to be equal to the right side.
We can multiply each atomic element by 2, to get C4H8O4.
Which of these elements is most likely to be a colorless gas based on the type of element? Al, Pd, Ar, Cs
Please help me immediately I will mark you as brainiest.
Distinguish between organic acid and mineral acid
Answer:
Mineral acids are very important to chemical procedures. An organic acid is an organic compound with acidic properties. ... Generally, organic acids are weak acids and do not dissociate completely in water, whereas the strong mineral acids do.
Answer:
Organic Acids:
organic acids are weaker.organic acids always contain carbon, hydrogen and oxygen. organic acids are naturally occurring. organic acids are found in plants and animals.Examples: Methanoic acid, ethanoic acid, lactic acid etc.Mineral Acids:
Mineral acids are strong. Mineral acids are derived from one or more minerals found on Earth.Other than hydrogen, no other element is fixed in mineral acids.Example: Hydrochloric acid, sulphuric acidwhich statement correctly describes protons and neutrons?
a. they have the same mass and the same electrical charge
b. they have the same mass but different electrical charge
c. they have the different masses but the same electrical charge
d. they have different masses and different electrical charges
Answer:
B
Explanation:
Which elements are likely to close electrons?
Answer:
Explanation:
In general, metals will lose electrons to become a positive cation and nonmetals will gain electrons to become a negative anion. Hydrogen is an exception, as it will usually lose its electron. Metalloids and some metals can be can lose or gain electrons.
lonic bonding
10. If two atoms that differ in electronegativity combine by chemical reaction and
share electrons, the bond that joins them will be
(1 Point)
ionic bond
polar covalent
nonpolar covalent
a hydrogen bond
Answer:
polar covalent
Explanation:
If they do not equally share the electron then it is polar and covalent bonds share electrons
Calculate the net force
175 N
1125 N
Answer:
_____________&_________Net force = sum of all forces with directionsso.....NET FORCE = 125+(-75) = 50 N in the direction of yellow t-shirt man------------------------------------What is the specific location water is in during each state of matter
Whas the the ionic radius of strontium
Answer: 255 pm
Explanation: Hope this helps!