What information does the atomic mass of an element provide?
Question 3 options:
the sum of electrons and protons in an atom
the difference between the number of protons and electrons
the number of protons and neutrons in an atom
the number of isotopes
the number of protons and neutrons in an atom
What is the part of the experiment that is measured? * 2 points control group constant independent variable dependent variable?
Adding energy or increasing the speed of the particles at very low pressure in a solid would cause
A) boiling.
B) condensation.
C) melting.
Eliminate
D) sublimation.
Answer:
D) sublimation.
Explanation:
took the test
Sublimation is the transition of a solid directly to gas. it can be seen as temperature moves to the right at very very low pressures.
Scientists can find new discoveries that change their current understanding of scientific knowledge.
True or False?
yea the answer is true
How many valence electrons does copper have?
how does the government provide support to the people of the HIV and AIDS awareness campaign
Answer:
AIDS is acquired immuno deficiency syndrome caused by the HIV (human immunodeficiency virus). The government has raised the following awareness campaign on AIDS:
Government provides proper health care to the individual suffering from AIDS.
The government raises the awareness and the importance of the HIV test.
The government provides drugs to the people that are effective against the HIV.
Which substance can not be broken down by a chemical change?
a.ammonia
b.methanol
c.propane
d.phosphorus?
What is the charge on the ion formed by aluminum? 13+ 5- 3+ 3- none of the above?
The ion formed by aluminum has a charge of 3+, known as Al³+. This aluminum cation is formed when aluminum loses three electrons, representing three more positive charges than it has electrons. The charge of 3+ is typical for ions formed from group 13 elements on the periodic table, like aluminum.
Explanation:The charge on the ion formed by aluminum is 3+. Aluminum, identified by the atomic number 13 on the periodic table, forms a cation when it loses three electrons, resulting in three more positive charges than it has electrons. This is the aluminum cation, represented as Al³+.
Aluminum falls into group 13 of the periodic table, wherein the charge of a cation formed by the loss of all valence electrons is equal to the group number minus 10. Hence, aluminum (in group 13) forms 3+ ions (known as Al³+).
In terms of reactivity, aluminum normally uses all of its valence electrons when reacting, resulting in compounds where it typically has an oxidation state of 3+ - making it a cation. Furthermore, many cations formed from aluminum, such as AlF3 and Al2(SO4)3, are even ionic.
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Which element could provide one atom to make an ionic bond with fluorine? (Hydrogen will not make ionic bonds easily, so do not use this element).
The following diagram shows a common way that scientific knowledge is discovered.
mc024-1.jpg
Which term should replace the question mark?
hypotheses
theories
laws
publications
What are all the possible sets of quantum numbers associated with electrons located in the orbitals of the 5p subshell of an atom?
The 5p subshell of an atom can contain electrons with six different sets of quantum numbers, corresponding to pairs of electrons in each of the subshell's three p orbitals. These sets of quantum numbers are: {5,1,-1,-1/2}, {5,1,-1,+1/2}, {5,1,0,-1/2}, {5,1,0,+1/2}, {5,1,1,-1/2}, {5,1,1,+1/2}.
Explanation:The 5p subshell of an atom can have electrons with a range of possible quantum numbers. A quantum number is a value assigned to describe the state of an electron in an atom. The 5p subshell has 3 orbitals, so it can contain up to 6 electrons.
When it comes to identifying the quantum number sets, the principal quantum number (n) will always be 5, representing the energy level. The azimuthal quantum number (l), which indicates the shape of the orbital, will be 1, representing a p-subshell. The magnetic quantum number (ml) can be -1, 0, 1, as there are 3 orbitals in a p-subshell. Finally, the spin quantum number (ms) can be -1/2 or +1/2, which indicates the spin orientation of an electron.
Therefore, all possible sets of quantum numbers for the electrons located in the orbitals of the 5p subshell are: {5,1,-1,-1/2}, {5,1,-1,+1/2}, {5,1,0,-1/2}, {5,1,0,+1/2}, {5,1,1,-1/2}, {5,1,1,+1/2}.
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In the periodic table which elements typically have similar properties
Elements in the periodic table with similar properties are found within the same group or vertical column, based on the periodic law which links properties to atomic numbers. Examples include alkali metals and halogens.
Explanation:In the periodic table, elements that typically have similar properties are grouped together in the same column or group. This is based on the periodic law, which states that the properties of the elements are periodic functions of their atomic numbers. For example, elements in the same vertical group have similar chemical behavior because they have the same number and distribution of electrons in their valence shells. This can be observed as you move down a group, with variations in characteristics such as atomic size, ionization energy, and electron affinity.
An example of this is the alkali metals in group 1, which all exhibit similar chemical properties. They are very reactive, especially with water, and tend to lose their single valence electron in chemical reactions. Similarly, halogens in group 17 also share properties, such as seven valence electrons and high electronegativity.
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_____ bonds share electron pairs. Ionic Metallic Hydrogen Covalent
Answer:
Covalent Bonds
Explanation:
Got it right on Odessyware ;) Have a nice day!!!
If a room requires 12.3 square yards of carpeting, what is the area of the floor in units of ft2? (3 ft = 1 yd)
Final answer:
To convert 12.3 square yards of carpeting to square feet, multiply by 9, as there are 9 square feet per square yard, resulting in an area of 110.7 ft².
Explanation:
To calculate the area of the floor in square feet (ft²) given that the area is 12.3 square yards, we need to use the conversion between yards and feet. One square yard is equal to nine square feet, as 1 yard is equivalent to 3 feet and this conversion applies in both dimensions of area. Hence, to convert square yards to square feet, you multiply the square yards by the square feet equivalent of one square yard:
12.3 yd² × (9 ft²/1 yd²) = 12.3 × 9 ft²
The area of the carpeting required in square feet is therefore:
12.3 × 9 = 110.7 ft²
Calculate the mass of a liquid with a density of 3.2 g/ml and a volume of 25 ml
The mass of a liquid density of 3.2 g/ml and a volume of 25 ml will be 80gm.
What is density?The density of a material is the measure of how tightly it is packed together. It is expressed as mass per unit volume. Density Symbol: D.
Density Formula:
d = m/V
Where d is the density, m is the object's mass, and V is the object's volume.
Three of an object's most fundamental properties are mass, volume, and density.
Mass describes how heavy something is, volume describes its size, and density is defined as mass divided by volume.
Although mass and volume are everyday concepts, the concept of density is less obvious and requires careful consideration.
Here it is given that
Density = 3.2g/ml.
Volume = 25 ml.
Mass = ?
Density = mass/volume.
Mass = density x volume.
Mass = 3.2 x 25.
Mass = 80gm.
Thus, the mass of the substance is 80gm.
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How many electrons and valence electrons does the element magnesium have?
How many protons and electrons are in the atom of sodium whose atomic number is 11?
What is the formula for the compound methane? express your answer as a chemical formula?
The chemical formula of methane is CH₄.
This means that a single molecule of methane consists of one carbon atom (C) and four hydrogen atoms (H). It is the simplest alkane and a major component of natural gas. Methane's structure can also be represented by a Lewis structure where the carbon atom forms covalent bonds with four hydrogen atoms.
This configuration allows methane to follow the octet rule, ensuring that the carbon atom has eight electrons in its valence shell, while each hydrogen atom follows the duet rule, having two valence electrons.The chemical formula of methane is CH₄, indicating one carbon atom bonded to four hydrogen atoms. The relative abundance of methane makes it a significant fuel source.Which reagent is the limiting reactant when 0.550 mol Al(OH)3 and 0.550 mol H2SO4 are allowed to react?
The ccl4 formed in the first step is used as a reactant in the second step. if 2.00 mol of ch4 reacts, what is the total amount of hcl produced? assume that cl2 and hf are present in excess.
Final answer:
When 2.00 moles of methane (CH₄) reacts with chlorine (Cl₂), according to the balanced chemical equation, the total amount of hydrogen chloride (HCl) produced is 8 moles.
Explanation:
The student is inquiring about the reaction between methane (CH₄) and chlorine (Cl₂) to produce carbon tetrachloride (CCl₄) and hydrogen chloride (HCl). We are given that 2.00 moles of methane react and asked to calculate the total amount of HCl produced, assuming that chlorine and hydrogen fluoride are present in excess.
First, we need to balance the chemical equation to understand the stoichiometry of the reaction:
CH₄ + 4 Cl₂ → CCl₄ + 4 HCl
From the balanced equation, we see that 1 mole of CH₄ reacts with 4 moles of Cl₂ and produces 4 moles of HCl. Therefore, if 2.00 moles of CH₄ reacts, it will produce:
mol HCl produced = 2 mol CH₄ × (4 mol HCl / 1 mol CH₄) = 8 moles of HCl
In the "methode champenoise," grape juice is fermented in a wine bottle to produce sparkling wine. the reaction is given below. c6h12o6(aq) 2 c2h5oh(aq) + 2 co2(g) fermentation of 724 ml grape juice (density = 1.0 g/cm3) is allowed to take place in a bottle with a total volume of 825 ml until 12% by volume is ethanol (c2h5oh). assuming that the co2 is insoluble in h2o (actually, a wrong assumption), what would be the pressure of co2 inside the wine bottle at 29°c? (the density of ethanol is 0.79 g/cm3.)
To calculate the pressure of CO2 in the wine bottle, you can use the ideal gas law equation PV = nRT. Convert the volume of ethanol produced to the volume of CO2 using stoichiometry. Take into account that the assumption that CO2 is insoluble in H2O is incorrect.
Explanation:The pressure of CO2 inside the wine bottle can be calculated using the ideal gas law equation PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin. To calculate the number of moles of CO2 produced, you need to convert the volume of ethanol produced to the volume of CO2 using stoichiometry. Finally, you can calculate the pressure of CO2 using the equation.
The density of ethanol is given as 0.79 g/cm3, so you can convert the volume of ethanol to its mass. The volume of CO2 produced is twice the volume of ethanol produced. From the information given, you can calculate the number of moles of CO2 produced. Then, you can convert the temperature in Celsius to Kelvin and use the ideal gas law equation to calculate the pressure of CO2 inside the wine bottle at 29°C.
Remember that the assumption made in the question that CO2 is insoluble in H2O is incorrect. In reality, it dissolves to some extent in water, which affects the pressure calculation.
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When substances are evenly spread throughout a mixture, it is called ____________________?
Suppose an adult is encased in a thermally insulating barrier so that all the heat evolved by metabolism of foodstuffs is retained by the body. what is her temperature increase after 2.5 hours? assume the heat capacity of the body is 4.18 j g–1k–1 and that the heat produced by metabolism is 9.4 kj kg–1hr–1.
Which of the following correctly describes the role of scientific models in the advancement of technology?
a. Models represent the basic facts.
b. Models are educated guesses that can be tested.
c. Models help us better understand the phenomena. <---?
d. Models answer specific questions about phenomena.
How do the general methods for separating mixtures and compounds differ?
Naturally occurring copper is 69.15% copper-63 (atomic mass = 62.93 amu) and 30.85% of some other isotopic form of copper. what must the atomic mass of this second isotope be in order to account for the 63.55 amu average atomic mass of copper? (write the answer to two decimal places.)
How many protons, neutrons, and electrons are in a neutral atom with the symbol 41Ca
The neutral 41Ca atom has 20 protons, 21 neutrons, and 20 electrons. The atomic number of Calcium is 20 which represents the number of protons and also the electrons in the neutral atom. To determine the number of neutrons, we subtract the number of protons from the total mass number, getting 21 neutrons.
Explanation:The symbol 41Ca for Calcium represents an isotope of Calcium. The number before the symbol, 41, is the mass number, which is the sum of protons and neutrons. The atomic number of Calcium (Ca), which represents the number of protons is 20 (from the periodic table). This doesn't change irrespective of the isotope. As it is a neutral atom, the number of electrons is equal to the number of protons, again 20.
To calculate the number of neutrons in this isotope, we subtract the number of protons from the mass number. So the number of neutrons = 41 - 20 = 21 neutrons.
In conclusion, the neutral 41Ca atom has 20 protons, 21 neutrons, and 20 electrons.
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Discuss why the formation of membranes helped in the development of more complex life forms.
Heliocentric theory _____.
Answer: was rejected by religious society and the church
Explanation:
At first, heliocentric theory was rejected by the Church and the religious public. Despite large amounts of evidence supporting the theory, the Catholic church prohibited scientists from teaching it as anything more than a hypothesis
When cream mixes with coffee, is this a chemical or physical change?
It is a physical change when cream mixes with coffee, it changes the color of the coffee. When you add more or less cream there is a color change depending on the consistency of cream. The properties are not changes and a no new compound is formed as in chemical change with a reaction of two compounds, a new compound is formed with different properties. So it is a physical change.