Answers
Answer:
True
Explanation:
magnesium and copper react with dilute acids to make salts and hydrogen gas
Related Questions
Lithium has an atomic mass of 6.941 amu. Lithium has two isotopes. One isotopes has a mass of 6.015 amu with a relative abundance of 7.49%. What is the mass of the other isotopes?
Answers
Explanation:
List the known and unknown quantities and plan the problem. Change each percent abundance into decimal form by dividing by 100. Multiply this value by the atomic mass of that isotope. Add together for each isotope to get the average atomic mass.
Answer:
The atomic mass of second isotope is 7.016
Explanation:
Given data:
Average Atomic mass of lithium = 6.941 amu
Atomic mass of first isotope = 6.015 amu
Relative abundance of first isotope = 7.49%
Abundance of second isotope = ?
Atomic mass of other isotope = ?
Solution:
Total abundance = 100%
100 - 7.49 = 92.51%
percentage abundance of second isotope = 92.51%
Now we will calculate the mass if second isotope.
Average atomic mass of lithium = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) / 100
6.941 = (6.015×7.49)+(x×92.51) /100
6.941 = 45.05235 + (x92.51) / 100
6.941×100 = 45.05235 + (x92.51)
694.1 - 45.05235 = (x92.51)
649.04765 = x 92.51
x = 485.583 /92.51
x = 7.016
The atomic mass of second isotope is 7.016
____________________________________________________
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Identify each element fluorine, germanium, zinc, phosphorus, lithium as a metal, metalloid or nonmetal
Answers
Answer:
flo-non metal
germ- metalloid
zinc - metal
phos- non metal
lithium- metal
Compare the way that frogs breathe when they are tadpoles with the way frogs breathe when they are adults.
Answers
Answer:Frogs breathe through gills underwater to get oxygen and when frogs are adults they breathe through their lungs to get oxygen.
Explanation:
Baking soda with hydrochloric acid combine and bubbles form. Chemical or physical change.
Answers
Answer:
I believe it is a chemical change.
what is the formula for hydrochloric acid
Answers
HCL
The formula for Hydrochloric Acid is HCL.
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Percocet contains oxycodone at varying strengths. Every strength also contains 325
mg of oxycodone per tablet. If the dose is not to exceed 3.9 g of oxycodone
daily, what is the maximum number of Percocet tablets a patient can take daily?
Answers
12 tablets maximum number of Percocet tablets a patient can take daily
Percocet is a prescription medicine used to treat the symptoms of acute pain and moderate-to-severe pain percocet may be used alone or with other medications percocet belongs to a class of drugs called Analgesics, Opioid Combos every strength also contains 325 this is the weakest dose of Percocet and is what most doctors will start with to help avoid side effects like respiratory depression this dosage is also used to gradually reduce Percocet dosage after dependence has developed, and to limit withdrawal symptoms percocet is a pain reliever for moderate to severe symptom over dose of percocet show side effect on body thats why 12 tablets maximum number of Percocet tablets a patient can take daily.
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7.5 L of a gas at 2 ATM and a temperature of 75°C is changed and volume to 3.4 L and a pressure of .5 ATM what is the new temperature
Answers
Answer:
Explanation:
Combined Gas Law
T2= T1P2V2/ (P1V1) = 348.15 X .5 X 3.4/(2 X 7.5) =39.46 K or -233.69C
the most correct definition of a chemical bond is the:
Answers
The following Lewis diagram represents the valence electron configuration of a main-group element.
This element is in group
.
According to the octet rule, this element would be expected to form an ion with a charge of
.
If is in period 5, the ion formed has the same electron configuration as the noble gas
.
The symbol for the ion is
.
Answers
This element is in group 1.
According to the octet rule, this element would be expected to form an ion with a charge of +1.
If X is in period 5, the ion formed has the same electron configuration as the noble gas Krypton
The symbol for the ion is Rb⁺
What is electronic configuration?Electronic configuration refers to the arrangement of electrons in the orbitals of an atom or molecule, indicating the energy level of the electrons, the number of electrons in each energy level, and the number of electrons in each orbital.
Considering the given element:
It has one valence electron, hence it is in group 1. Group 1 elements form ions with a charge of +1.
Losing one electron will give the ion the same electron configuration as Kyrton since it is the noble gas in Period 4.
The element is rubidium and the ion is Rb⁺.
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what does the word interact
Lift
Fly
Discuss
Work with
Answers
Answer:
The answer would be work with.
Explanation:
Because, if we know what the word interact means then we can look for a word similar to interact. hope this makes sense <3.
A decrease in entropy is associated with which of the following types of reaction?
A) dehydration B) catabolic C) depolymerization D) hydrolysis
Answers
Dehydration of the process is linked to a decrease in entropy. correct option is (A).
Entropy is a measurement of a system's disorganization. It is an extended attribute of a thermodynamic system, which means that the amount of matter in the system affects its value. Entropy is frequently represented in equations by the letter S and is measured in joules per kelvin.
By combining several molecules into one, a dehydration reaction lowers the system's entropy. On the other hand, entropy is raised by catabolic, depolymerizing, and hydrolytic activities that break down molecules into smaller parts.
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How would you prepare ketone from a suitably substituted alkyl bromide containing four carbon atoms in the molecule?
Answers
A combination of -carbon alkylation and -dicarboxylic acid decarboxylation is required to create methyl ketone from an acetoacetic ester or an alkyl halide. The process involves the use of a secondary halide or a methyl halogen.
How is acetoacetate used by the body?
Acetoacetate and -hydroxybutyrate are metabolic byproducts of fatty acid oxidation that are used as fuel in extrahepatic tissues. The production and use rates have an impact on their blood level. Oxidation increases as their serum levels do as well.
Does the brain use acetoacetate?
Glucose serves as the main fuel source for supplying the brain's energy requirements. However, the brain uses ketones, such as acetoacetate or beta-hydroxybutyrate, as energy sources in some circumstances, such as diabetes, famine, during the nursing period, and the state of deep sleep.
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Rank in order of acidity (1= most acidic)
Answers
The rank order of acidity is para nitro phenol > meta nitro phenol > phenol > Para amino phenol.
What does acidity order mean?'The nitro group is a powerful electron withdrawing group. As a result, by removing electron density from the carboxylate ion, it increases the acidity of benzoic acid. This effect is strongest when the nitro group is in the ortho position (the effect is known as ortho effect).
The chemical structure of an acid can be used to predict its relative strength. An acid is generally stronger when the H-A bond is more polar. When the H-A bond is weaker and the conjugate base, A, is more stable, acidity increases.
Thus, The rank order of acidity is para nitro phenol > meta nitro phenol > phenol > Para amino phenol.
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Every magnet must have what at its ends?
Answers
Answer:
A) a north pole and a south pole
Explanation:
As, a magnet will have a north pole in one of its end and a south pole in the other
LEEN was observing the physical properties of elements in order to classify them as either a metal, non-metal, metalloid or any other type of element. The first element was dull, brittle, and did not conduct heat. What would its classification be
Metal
Non-metal
Metalloid
Radioactive element
Answers
Answer:
Non-metal
Explanation:
A non-metal is a substance that possesses the following characteristics:
- It is brittle i.e can break easily
- It does not conduct heat and electricity
- It is not lustrous i.e does not shine when polished.
According to this question, LEEN was observing the physical properties of elements in order to classify them. He found that the first element was dull, brittle, and did not conduct heat. This makes it a NON-METAL.
How can a large object and a small object have equal momentum?
Answers
Answer:
answer
Explanation:
An object that has a small mass and an object that has a large mass have the same momentum. ... Since the kinetic energy of an object is momentum times of speed. Therefore, for the same momentum, the mass of higher speed will have more energy i.e. the smaller mass.
which has the lowest number of valence electrons? and how many does each have?
Mg2+
Ga+
Ar+
C+
S2-
F-
Answers
Fluorine (F-) is the element with the fewest valence electrons. Seven electrons make up the outermost shell of fluorine, and one of them is unpaired. As a result, fluorine possesses seven valence electrons altogether.
Eight valence electrons are present in magnesium (Mg2+), nine are present in gallium (Ga+), eight are present in argon (Ar+), four are present in carbon (C+), six are present in sulphur (S2-), and seven are present in fluorine (F-).
Fluorine has a lower number of valence electrons than the other elements because it has a greater effective nuclear charge. This indicates that the fluorine atom will take electrons away from its outermost shell since it is more attracted to electrons than the other elements.
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Ceramics tend to be
A. Strong and ductile.
B. Strong, brittle and good insulators.
C. Dense, chemically stable, and malleable.
D. Strong, brittle and malleable.
Answers
Answer:
B. Strong, brittle and good insulators.
Explanation:
The correct answer is B. Ceramics tend to be strong, brittle, and good insulators. They are not ductile, chemically stable or malleable.
Which statement is true of energy in reactants during an endothermic reaction?(1 point)
The energy found in the reactants remains in the system, and the reactants also take energy from the surroundings.
All of the energy from the reactants will be lost to the surroundings.
All of the energy from the reactants will remain in the system
Some of the energy in the reactants will remain in them after the reaction, but some is lost to the surroundings. plz anwres right for extra points
Answers
The energy found in the reactants remains in the system, and the reactants also take energy from the surroundings.
A typical barometric pressure in Denver, Colorado, is 624 mm Hg. What is this pressure in atmospheres?
Answers
A barometric pressure of 624 mm Hg is equivalent to 0.821 atmospheres.
Barometric pressure, also known as atmospheric pressure, is the force per unit area exerted by the weight of the air above a given point on Earth's surface due to the force of gravity pulling air towards the Earth. It is typically measured using a barometer and is expressed in units of pressure, such as millimeters of mercury (mm Hg), atmospheres (atm), or pascals (Pa).
To convert barometric pressure from millimeters of mercury (mm Hg) to atmospheres (atm), we can use the conversion factor;
1 atm = 760 mm Hg
So, to convert 624 mm Hg to atmospheres, we divide by 760:
624 mm Hg / 760 mm Hg/atm
= 0.821 atm
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James measured the humidity of the air on his backyard each morning for four days His data is recorded below On which day did it most likely rain
Answers
Answer:
hdbdjsjsj
Explanation:
hdhshshe
Suppose you are trying to find the volume of a box based on the given measurements for the length, width, and height of the box, where the height was measured in two parts. length, =2.20 in width, =2.91 in height, ℎ=10.4 in+1 in Calculate the height, ℎ, of the box, first keeping all digits, then rounding to the proper number of significant figures.
Answers
Based on the given measurements for the length, width, and height of the box;
the height of the box, h, is 11.4 inchesthe volume of the box, V, is 73.0 in³What is the height of the box?The height of the box is determined from the data provided as follows:
length, l = 2.2 in
width, w = 3.5 in
height, h = 10.4 in + 1 in
The height of the box = 10.4 + 1 in
Hence, the height of the box = 11.4 in
The volume of the box is calculated as a product of the length, width, and height of the box as determined from the measurements taken.
The volume of the box, V = l × w × h
where;
l is length = 2.20 in
w is the width = 2.91 in
h is the height = 11.4 in
The volume of the box, V = 2.20 * 2.91 * 11.4
The volume of the box, V = 73.0 in³
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Complete question:
Suppose you are trying to find the volume of a box based on the following measurements for the length, width, and height of the box, where the height was measured in two parts.
length, l = 2.2 in
width, w = 3.5 in
height, h = 10.4 in + 1 in
a. Calculate the height (h) of the box first keeping all digits, then rounding to the proper number of significant figures.
b. Calculate the volume (V) of the box using V = l × w × h. Round to the proper number of significant figures.
how many moles are in 83 particles of sodium chloride?
Answers
Answer:
there are 1.4201927800478769 moles in 83 particles of sodium chloride. or 1.42 for short.
Explanation:
you have a friend who is using a recipe for flat from american cookbook you notice that he set your over temperature at 175F° what you advise him to do?
Answers
Answer:
I will give them advice, that do the power of flame low....
Explanation:
thanks.
Limiting Reactant
12.0 grams of sodium reacts with 5.00 grams of chlorine. What mass of sodium
chloride could be produced?
Nas) +
Cl2(g) →
NaCls)
(1)
(2)
Identify the limiting reactant.
Determine the amount of sodium chloride produced.
Answers
Answer:
(1) Cl₂ is the limiting reactant.
(2) 8.18 g
Explanation:
2Na(s) + Cl₂(g) → 2NaCl(s)First we convert the given masses of reactants into moles, using their respective molar masses:
Na ⇒ 12.0 g ÷ 23 g/mol = 0.522 mol NaCl₂ ⇒ 5.00 g ÷ 70.9 g/mol = 0.070 mol Cl₂0.070 moles of Cl₂ would react completely with (2 * 0.070) 0.14 moles of Na. There are more Na moles than that, so Na is the reactant in excess while Cl₂ is the limiting reactant.
Then we calculate how many moles of NaCl are formed, using the limiting reactant:
0.070 mol Cl₂ * \(\frac{2molNaCl}{1molCl_2}\) = 0.14 mol NaClFinally we convert NaCl moles into grams:
0.14 mol NaCl * 58.44 g/mol = 8.18 gConvert 675000 to scientific notation
Answers
Answer:
To convert 675000 to scientific notation, we need to express it in the form a × 10^n, where a is a number between 1 and 10 (but not 10 itself), and n is an integer.
Starting with 675000, we can divide by 10 repeatedly until we get a number between 1 and 10.
675000 ÷ 10 = 67500 (one division by 10)
67500 ÷ 10 = 6750 (two divisions by 10)
6750 ÷ 10 = 675 (three divisions by 10)
Now we have a number between 1 and 10 (namely, 6.75), and we know that we divided by 10 three times, so the exponent is -3.
Therefore, we can express 675000 in scientific notation as:
6.75 × 10^5
(Note that we could also express it as 6.75 × 10^2 × 10^3, but this is not in standard scientific notation, which requires the coefficient to be between 1 and 10.)
if scientists found a fossil in the middle layer that was 2 million years old, would they think Earth was more or less than 2 million years
Answers
The discovery of a 2-million-year-old fossil would align with the existing understanding of Earth's geological history, as it falls within the timeframe of the Quaternary period.
If scientists found a fossil in the middle layer that was determined to be 2 million years old, they would not automatically conclude that Earth was younger or older than 2 million years. The age of the fossil would provide valuable information about the minimum age of the layer in which it was found, but it would not necessarily provide conclusive evidence about the age of the entire Earth.
To determine the age of Earth, scientists rely on a variety of dating methods, including radiometric dating of rocks and minerals, as well as the study of isotopes and geological processes. These methods provide estimates of Earth's age in the billions of years.However, it would not significantly alter the prevailing scientific consensus that Earth is approximately 4.5 billion years old. The age of Earth is based on a comprehensive body of evidence from multiple disciplines and dating techniques, and a single fossil would not overturn that understanding.
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What is Na2Co3? How look like that's?
Answers
Sodium carbonate, often referred to as Na2CO3, is a chemical compound composed of atoms of sodium (Na), carbon (C) and oxygen (O).
It is also sometimes called washing soda or soda ash. At room temperature, sodium carbonate is a white, crystalline solid that is very soluble in water. According to the chemical formula of the sodium carbonate molecule, Na2CO3, each molecule consists of two sodium atoms (Na), one carbon atom (C) and three oxygen atoms (O). The atomic configuration in sodium carbonate is shown in the given diagram.
A trigonal planar arrangement is formed when the central carbon atom is bonded to three oxygen atoms. The structure of sodium carbonate is completed by two sodium atoms joined to oxygen atoms.
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Which of these statements is true?
1. Electrons reach higher energy levels when they move closer to the nucleus.
2. An electron can absorb energy only from light.
3. The spectrum of hydrogen consists of all frequencies of radiation.
4. The emission spectrum of each element is unique
Answers
Humans have 50 pairs of chromosomes true or false
Answers
Answer:
False
Explanation:
humans have 23 pairs