Answer:
if you add a neutron to lithium-7 it becomes a compound nucleus of lithium-8
Which statements describe crossing over? Check all that apply. Crossing over occurs during prophase II of meiosis. Crossing over combines a sperm cell with an egg cell. Crossing over happens when pairs of chromosomes pair up. Crossing over ensures that a new cell is identical to the original cell. Crossing over creates new combinations of genes on chromosomes.
Answer:
Crossing over happens when pairs of chromosomes pair up
Crossing over creates new combinations of genes on chromosomes.
Explanation:
The correct answer would be that crossing over happens when pairs of chromosomes pair up, exchange chromosomal segments, and create new combinations of genes on chromosomes.
Crossing over occurs during prophase I of meiosis when homologous chromosomes pair up to form a tetrad. Paired chromosomes then exchange chromosomal segments containing genes leading to a new combination of genes on each chromosome. Hence, the resulting daughter cells are genetically different from the original cell.
Answer:
a e
Explanation:
What is the name of the following compound: *
PH3
Order the following elements from Highest to Lowest Electronegativity.
K, Sc, Ca, Zn, Br
Sc, K, Br, Zn, Ca
OK, Ca, Sc, Zn, Br
O Br, Zn, Sc, Ca, K
Ca, Zn, Br, K, SC
Answer:
O, Ca, Zn, Br
Sc, K, Br,
Explanation:
The correct order of the chemical elements from highest to lowest electronegativity is: C. Br, Zn, Sc, Ca, K.
Electronegativity refers to a measure of the ability of an atom of a chemical element to attract any shared pair of electrons.
Generally, the electronegativity of a chemical element typically increases across the period from left to right.
In Chemistry, the electronegativity of some of the chemical element are:
Bromine (Br) = 2.96Calcium (Ca) = 1.0Zinc (Zn) = 1.65Potassium (k) = 0.82Scandium (Sc) = 1.36Hence, the order of the chemical elements from highest to lowest electronegativity is:
1. Bromine (Br) = 2.96
2. Zinc (Zn) = 1.65
3. Scandium (Sc) = 1.36
4. Calcium (Ca) = 1.0
5. Potassium (k) = 0.82
Read more: https://brainly.com/question/18214726
What would the formula be for Molybdenum V Carbonate?
Answer:
CMoO3 - PubChem.
Explanation:
the transfer of energy by waves is also known as _______
Answer:
wave
Explanation:
'Wave' is a common term for a number of different ways in which energy is transferred: In electromagnetic waves, energy is transferred through vibrations of electric and magnetic fields.
i hope this helps and your welcom
Which pair of elements has the most similar chemical properties?
1. K and Ca
2. Cl and Ar
3. P and N
4. C and Na
Answer:
3. P and N
Explanation:
Since they are in the same family group on the periodic table (the elements in vertical lines), they are the most similar. Hope this helps!
Answer:
3. P and N
Explanation:
Both elements are in the same group, sharing the most similar properties.
The murder weapon weighs 150 grams. The initial temperature of the weapon before being tested was 100 oC. After placing the weapon in the water, the temperature dropped to 25.13 oC. Find the specific heat capacity of the unknown metal by first calculating the heat energy gained by the water.
Water
Mass = 2500 g
Initial temperature = 25 o C Final temperature = 25.13 oC
Equations
q = m C p Δ T C p = q / (mΔT)
1. How much heat energy (q) did the water gain?
2. What is the specific heat capacity (C p) of the unknown metal?
3. Compare the heat capacity you calculated with the one below, which one matches?
Specific heat capacity of metal (J / g or C)
Silver 0.235
Gold 0.129 Lead 0.121
Copper
4. What metal was the murder weapon made of?
0.385
1. heat gained : 1358.5 J
2. Cp metal = 0.121 J/g C
3/4 The metal = Lead
Further explanationThe law of conservation of energy can be applied to heat changes, i.e. the heat received/absorbed is the same as the heat released
Q in = Q out
Heat can be calculated using the formula:
Q = mc∆T
Q water(gained) = Q metal (lost)
1. Heat of water gained
[tex]\tt Q=2500\times 4.18\times (25.13-25)=1358.5~J[/tex]
2. The specific heat capacity (C p) of the unknown metal :
[tex]\tt Cp=\dfrac{1358.5}{150\times (100-25.13)}=0.121~J/g^oC[/tex]
15. An increase in atomic number is related to an increase in atomic mass because
a. more electrons are present in the atomic nucleus
b. more electrons are orbiting the atomic nucleus
c. more protons are present in the atomic nucleus
d. more protons are orbiting the atomic nucleus
Answer:
[tex]\boxed {\boxed {\sf C. \ More \ protons \ are \ present \ in \ the \ atomic \ nucleus}}[/tex]
Explanation:
First, let's define atomic number.
⇒ The number of protons in an atom.
⇒ This number determines the identity and properties of the atom
So, atomic number relates to protons. There is an increase in atomic number, so there must be more protons in the atom. We can eliminate choices A and B, because they pertain to electrons.
We are left with choices C and D. The difference between them is the location of the protons.
Protons are part of the nucleus of the atom: the dense, central region of the atom comprised of nucleons: protons and neutrons.
Electrons, not protons, orbit the nucleus, so D is not correct.
We are left with choice C: more protons are present in the atomic nucleus
Write application of isotopes .
Answer:
In the chemical industry.
Isotopes are the atoms of the same element with same atomic no: and different mass numbers. ... ⇒As isotope of uranium is used as a fuel in nuclear reactor. ⇒An isotope of iodine is used in the treatment of goitre. ⇒An isotope of cobalt is used in the treatment of cancer.
Which is the vector quantity that describes the shortest path between two points?
The shortest distance taken by the object to reach the destination at a minimum time is called acceleration. Thus value acceleration depends upon the displacement and time.
What is environment?
Answer:
where an organism lives which includes everything that surrounds and influences the organism.
A student calculates the density of an unknown solid. The mass is 10.04 grams, and the volume is 8.21 cubic centimeters. How many significant figures should appear in the final answer
Answer:
1.22 g/cm³
Explanation:
Density = mass ÷ volume
Mass = 10.04 grams
Volume = 8.21 cubic centimeters
Density = mass ÷ volume
= 10.04 ÷ 8.21
= 1.2228989037758 g/cm³
Approximately
1.22 g/cm³ to 2 significant figure.
The final answer should be approximated to 2 significant figure because the mass and volume of the objective given is in 2 significant figure
how many protons does the neutral atom pictured have?
A) 8
B) 18
C) 2
D) 20
Answer:
b 18
Explanation:
There is a mixture of three gases. We know the total pressure is 2.50 atmosphere and the pressure of the oxygen and the nitrogen in the mixture are 0.52 atmosphere and 0.84 atmosphere. The jar containing the gases has a volume of 25.0 liters and is at a temperature of 32 degrees Celsius. What are the pressure and the number of moles of carbon dioxide in the container?
Answer:
1.14 atm and 1.139 mol
Explanation:
The total pressure of the container is equal to the sum of the partial pressure of the three gasses:
P = Poxygen + Pnitrogen + Pcarbon dioxide2.50 atm = 0.52 + 0.84 + Pcarbon dioxideNow we solve for the pressure of carbon dioxide:
Pcarbon dioxide = 1.14 atmTo calculate the number of CO₂ moles we use PV=nRT:
P = 1.14 atmV = 25.0 Ln = ?R = 0.082 atm·L·mol⁻¹·K⁻¹T = 32 °C ⇒ 32 + 273.16 = 305.16 K1.14 atm * 25.0 L = n * 0.082 atm·L·mol⁻¹·K⁻¹ * 305.16 K
n = 1.139 molPlease help I’ll give you guys brainiest!
Thank youuuuuuu :))
Answer:
Balanced.
Explanation:
Both sides are pulling with equal force.
Answer/Explanation:
These forces are balanced. In order for forces to be balanced they must be pulling/pushing the same amount of net force in opposing directions.
In order for forces to be balanced they must be pulling/pushing in opposing directions but with differentiating net force.
What does the little ‘3’ in 2NH3 mean?
Answer:
It determines the number of molecules
Answer:
it means there are 3 hydrogen atoms in the compound.
What is the energy of a radio wave whose frequency is 6.2 x 106 Hz?
Answer:
657.2 Hz
Explanation:
What is not a correct description of a chemical element?
a. It is made of one type of atom.
b. It is the simplest substance of all matters.
c. Its atoms can be chemically separated.
d. Its atoms can be physically separated.
Answer:
b
Explanation:
because it is the simplest substance of all matters
how a neutral object is different from a negatively charged object.
Answer:
Charged objects have an imbalance of charge - either more negative electrons than positive protons or vice versa. And neutral objects have a balance of charge - equal numbers of protons and electrons. ... Their presence (or absence) will have no direct bearing upon whether an object is charged or uncharged.
15. Name the element that has 3 energy levels and 3 valence electrons. *
Answer:
aluminium ..............
1. How many moles of Mg are there in 9.20 x 1024 atoms of Mg?
Answer:
15.28 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{9.20 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 15.282392..[/tex]
We have the final answer as
15.28 molesHope this helps you
What is the difference between chlorine -35 and chlorine -37?
Answer:
Free chlorine involves the amount of chlorine that's able to sanitize contaminants, while combined chlorine refers to chlorine that has combined directly with the contaminants. Total chlorine is basically the sum of free chlorine and combined chlorine.
Explanation:
chlorine -35 being chlorine
chlorine -37 being free chlorine
how many grams are in 1.09 moles of glucose?
The electron dot diagram for an atom of carbon has how many pair(s) of electrons and how many unpaired electrons
Answer:
The resultant structure is shown below. This structure contains four shared pairs of electrons, which are located on all four "sides" of carbon's electron dot structure. Each of these shared pairs was created by pairing one of carbon's unpaired electrons with an unpaired electron from chlorine.
Explanation:
How many molecules of H2O are in 8.54 moles of H2O?
Select one:
a. 5.14 * 10^24 molecules H2O
b. 2.86 * 10^23 molecules H2O
c. 6.02 * 10^23 molecules H2O
d. 5.14 * 10^23 molecules H2O
Answer:
[tex]\boxed {\boxed {\sf A. \ About \ 5.14 *10^{24} \ molecules \ H_2O}}[/tex]
Explanation:
To convert from moles to units, we must use Avogadro's Number: 6.022 * 10²³
This tells us the number of units (molecules of water in this problem) in 1 mole of a substance (water). We can use it as a ratio or fraction.
[tex]\frac{6.022 *10^{23} \ molecules \ H_2O}{1 \ mol \ H_2 O}[/tex]
Now, we can multiply this fraction by the moles of water (8.54) given.
[tex]8.54 \ mol \ H_2O*\frac{6.022 *10^{23}\ molecules \ H_2O}{1 \ mol \ H_2 O}[/tex]
When we multiply, the moles of water will cancel out.
[tex]8.54 *\frac{6.022 \ molecules \ H_2O}{1 \ }[/tex]
Since the fraction has a 1 as a denominator, we can remove it. The problem will be a simple multiplication problem.
[tex]8.54*6.022 \ molecules \ H_2O[/tex]
[tex]5.142788*10^{24} \ molecules \ H_2O[/tex]
The original measurement of 8.54 has 3 significant figures (8, 5, and 4). Therefore, we must round our answer to 3 sig figs, which is the hundredth place in this case.
The 2 in the thousandth place tells us to leave the 4 in the hundredth place.
[tex]5.14 *10^{24} \ molecules \ H_2 O[/tex]
There are about 5.14*10²⁴ molecules of water in 8.54 moles.
Answer:
5.14 x 10^24 molecules of H2O.
Explanation:
just took the test
Which of the following methods can be used to completely separate a solution containing alcohol and water?
A) Evaporation and distillation
B) Filtration
C)Floatation or centrifuge
D) Magnetism
What are the chemical properties of iron meta
Answer:
Physical properties
Atomic mass: 55.845
Density: 7.87 g/cm3
Group: Transition metals
Electrons: [Ar] 3d6 4s2
Melting point: 1811 K
Boiling point: 3134 K
Discovered: Ancient times
Explanation:
hope this helps! :D
is the lorax story relevant today society?
Answer:
well i would say yes because how the factory made the air bad and how they all were fighting just about a tree
Explanation:
Answer: LOL XD no because of CO/VID
Explanation: BRAINLIEST PLS LOL
When an atom becomes a negative ion, it
It becomes a positives atom. Since it loses electrons it has more of a positive charge than a normal atom.
How are a mole and a dozen similar?
Answer:
Each names a given number of objects.
Explanation: