Answers
Answer:
N- 7 protons, 14 mass number
Ca- 20 protons, 20 neutrons, 20 electrons
I- 53 protons, 127 mass number
Cr- Cr, 12 neutrons
Br- 34 protons, 35 electrons, 79 atomic mass
Related Questions
Which description best characterizes the motion of particles in a solid?
a. slow but able to move past one another
b. fast and widely spaced
c.not moving
d.vibrating around fixed positions
Answers
Answer:
Explanation:
Slow but able to move past one another
Choose the formula for hydroxide.
OH
HPO4
Ca(OH)2
d Ba(OH)2
Answers
Answer:
OH
Explanation:
Hydroxide is a diatomic anion with chemical formula OH⁻.
When comparing the proper position for spotting different exercises, you can conclude that, in spotting any exercise, it is important to __________. A. stand with your feet together B. keep your hand on the bar C. keep your back upright D. Place your hand inside the lifter's hands Please select the best answer from the choices provided. A B C D
Answers
Answer:
The answer is B
Explanation:
I took the test. PS... if your taking this test in college you should know it. I'm taking this test in middle school and got a 100%
Exercising is an essential part of the body's daily rouging and hence its necessary to keep the position of the body straight when standing and spotting the exercises.
The person should adopt the proper mechanism of exercising and a proper formal way of doing it. They should focus on posture when standing and sitting.Hence the option C is correct.
Learn more about the proper position for spotting different exercises,
brainly.com/question/1255990.
if you perfom 30 joules of work lifting a 20-N box from the floor to a shelf how high is the shelf
Answers
Answer: 1.5 m
Explanation: E=mgh=Fh
30 J = 20 N * h
h = 30/20 = 1.5 m
Answer:
1.5 m
Explanation:
it just is its easy made A on test
How many moles of sodium chloride are present in 0.5 L of 4 Molar NaCl(aq)
Select one:
O a. 2 moles
O b. 3 moles
c. 8 moles
d. 0.25 moles
Answers
Answer:
the answer is c.
Explanation:
The number of moles of sodium chloride present in 0.5 L of 4 Molar NaCl(aq) is 2 moles. The correct option is a.
What are moles?Moles are the quantity or amount of any substance. It is a measurement quantity.
The concentration of NaCl is 4 molar
The volume of the solution is 0.5 L is given.
To calculate the number of moles, we use the formula of molarity, in which moles are divided by the volume of the given solution. The formula is:
Molarity = moles/ volume
4 M = moles / 0.5 L
Putting the values in the given formula:
Moles = 4 x 0.5 L = 2 moles
Thus, the correct option is a. 2 moles is the number of moles of sodium chloride.
Learn more about moles, here:
https://brainly.com/question/26416088
#SPJ2
An object with a mass of 20.0 kg has a force of 5.0 Newton's applied to it. What is the resulting acceleration of the object?
Answers
Answer:
1/4
Explanation:
force/mass
5/20=1/4 abs
Consider the reaction below. Which species is(are) the Brønsted-Lowry acid(s)?
HF (aq) + NHâ (aq) â NHâ⺠(aq) + Fâ» (aq) g
Answers
Answer:
HF is the acid
Explanation:
The Brønsted-Lowry theory defines the acids and bases in chemistry as follows:
An acid is the species that can donate a proton
A base can accept protons.
In the reaction:
HF(aq) + NH₃(aq) → NH₄⁺(aq) + F⁻(aq)
As you can see, HF can donate its proton to produce F⁻: HF is the acid
In the same way, NH₃ is accepting a proton, NH₃ is the base.
What is the atomic mass for cl
Answers
Answer:
Chlorine's (Cl) atomic mass if 17.
Explanation:
"Chlorine (atomic number 17) is a yellowish-green toxic gas. About three quarters of all chlorine atoms have 18 neutrons, giving those atoms a mass number of 35. About one quarter of all chlorine atoms have 20 neutrons, giving those atoms a mass number of 37."
which issue is a limitation of using synthetic polymers
Answers
Answer: As trash, Synthetic Polymers are not biodegradable. Landfills can easily fill up with synthetic polymers. Plastics can be made into different products. Recycling synthetic polymers is costly.
Explanation: Hope this helps in any way possible!
The main issues of using synthetic polymers include toxicity poor biocompatibility etc. Synthetic polymers stay non-degradable for ling time and make the surface polluted.
What are synthetic polymers?Natural polymers are naturally made substances such as cellulose, starch, glycogen etc. Polymers made by man are called synthetic polymers. Synthetic polymers are diverse and are made through several polymerization techniques.
PVC, polyethylene, polyesters Teflon etc. are very common polymers in daily life. A major class of synthetic polymers include plastics which are major pollutants nowadays.
Most of the synthetic polymers are non-biodegradable and will cause landfill issues. Some them are toxic in nature and might cause several health issues. Blending them with biodegradable polymers is a solution for this.
Find more on synthetic polymers:
https://brainly.com/question/4047007
#SPJ2
When solving by using the Quadratic Formula, what are the steps to follow? a. factor, find values for a,b,c, subtract c. substitute into the formula, find values for a,b,c, simplify b. simplify, find values for a,b,c, factor d. find values for a,b,c, substitute into the formula, simplify
Answers
Answer:
D!
Explanation:
When solving by using the Quadratic Formula, The steps to follow are to find values for a, b, c, substitute them into the formula, and simplify. The correct option is d.
What are Quadratic Formulas?A quadratic equation is a mathematical equation that shows the equation in an arranged form in which the unknown variables are x and known variables are a, b, and c. Where a is not equal to 0.
The standard quadratic equation
ax² + bx + c = 0
To solve the quadratic equation, first, find the variable value, and substitute the value of a, b, and c. Simplify it and ans solve it and then get the solution. There is another thing in the quadratic equation, which is factorization.
Thus, the correct option is d. find values for a, b, c, substitute them into the formula, and simplify.
To learn more about Quadratic Formulas, refer to the link:
https://brainly.com/question/11540485
#SPJ2
Objects that conduct electricity can easily carry an electrical charge. Which of the following materials best conducts electricity?
A. copper wire
B. plastic tubing
C. rubber sheets
D. cotton string
Answers
Copper carries electricity
Better
Answer:
copper wire!
Explanation:
Each copper atom has lost one electron and become a positive ion. ... The electrons can move freely through the metal. For this reason, they are known as free electrons. They are also known as conduction electrons, because they help copper to be a good conductor of heat and electricity. Copper, Silver, Aluminum, Gold, Steel and Brass are common conductors of electricity. When properly installed, it is the safest and most efficient metal to produce electricity. Copper is commonly used as an effective conductor in household appliances and in electrical equipment in general. Because of its low cost, most wires are copper-plated. For a material to be a good conductor, the electricity passed through it must be able to move the electrons; the more free electrons in a metal, the greater its conductivity.
Round each number to two significant figures. 0.002353
Answers
Answer:
0.0024
Explanation:
you dont count the zeros as significant factors then round up 3 to 4 because you always round up if its 5 dont worry about the other numbers you dont need them hope it helped
What do you notice when you get into a car that has been sitting in the sun for a while?
Why is the inside of the car so hot?
How would things be different if the car’s windows were left open?
Answers
Answer:
I notice that it's extremely hot after it has been sitting in thr sun for a while. The sun's rays have been directly shining on the car because the car was in the sun's Ray's directly. If the car's windows were to be left open, it would be less hot but still be hot if the rays of the sun were directly on the car.
What is the current in a 160V circuit if the resistance is 5Ω?
Answers
Answer:
use v=IR
Explanation:
so, 160=I*5
I = 160/5
=32 ampere
The current = 32 A
Further explanationElectric current is a ratio between the voltage and the amount of resistance at the conductor.
Can be formulated
[tex]\large{\boxed{\bold{I=\frac{V}{R}}}[/tex]
V = Voltage (volts)
R = resistance (ohms)
This formula is also known as Ohm's Law, which states that
the amount of current flowing is directly proportional to the voltage and inversely proportional to the resistance.
V=160 V
R=5Ω
[tex]\tt I=\dfrac{160}{5}=32~A[/tex]
A biology experiment requires the preparation of a water bath at 37.08C (body temperature). The temperature of the cold tap water is 22.08C, and the temperature of the hot tap water is 55.08C. If a student starts with 90.0 g cold water, what mass of hot water must be added to reach 37.08C
Answers
Answer:
75 g
Explanation:
[tex]m_1[/tex] = Initial mass of water = 90 g
c = Specific heat of water
[tex]\Delta T_1[/tex] = Initial temperature difference = [tex](37.08-22.08)^{\circ}\text{C}[/tex]
[tex]m_1[/tex] = Mass of water to be added
[tex]\Delta T_2[/tex] = Final temperature difference = [tex](37.08-55.08)^{\circ}\text{C}[/tex]
Since, heat energy in the system is conserved we know
[tex]m_1c\Delta T_1+m_2c\Delta T_2=0\\\Rightarrow m_1c\Delta T_1=-m_2c\Delta T_2\\\Rightarrow m_2=-\dfrac{m_1\Delta T_1}{\Delta T_2}\\\Rightarrow m_2=-\dfrac{90(37.08-22.08)}{37.08-55.08}\\\Rightarrow m_2=75\ \text{g}[/tex]
The mass of water to be added to reach the desired temperature is 75 g.
2) The respiratory and digestive system work together to help the body
function efficiently. What is ONE way in which the two body systems
work together?
A)
The respiratory and digestive systems work together
to provide nutrients to tissues.
B)
The respiratory and digestive systems work together
to rid the body of carbon dioxide.
The respiratory and digestive systems work together
to make usable ATP energy for cells.
The respiratory and digestive systems work together
to make enzymes for the breakdown of nutrients,
D)
Answers
A is the correct answer
Answer:
The correct option is C.
The respiratory and digestive systems work together
to make usable ATP energy for cells.
Explanation:
DIGESTIVE SYSTEM is the System the body that help to breakdown compound molecules into smaller pieces that can easily by absorbed by the body hence release nutrients and ATP. Energy are stored as glucose and resuable as ATP.
RESPIRATION is a process whereby oxygen is inhaled and it help to breakdown large compounds to release energy (ATP) and carbon dioxide is released. Both system work together to release ATP for cells.
Therefore , The respiratory and digestive systems work together
to make usable ATP energy for cells. Is the correct option.
What is a segment of DNA that can code for?
Answers
Answer:
gene
Explanation:
DNA is divided into functional units called genes. A gene is a segment of DNA that codes for a functional product (mRNA, tRNA, or rRNA). Since the vast majority of genes are transcribed into mRNA and mRNA is subsequently translated into polypeptides or proteins, most genes code for protein synthesis
Answer:
coding for protein are called exons, and the noncoding regions separating the exons are called introns. Following transcription, these coding sequences must be joined together before the mRNAs can function. The process of removal of the introns and subsequent rejoining of the exons is called RNA splicing.
Explanation:
5. A sample of methane has a volume of 225 mL at 0.650 atm of pressure. What will the new volume be if the
pressure is increased to 1.25 atm?
Answers
Answer:
not sure
Explanation:
A neutron has what kind of charge?
Answers
A proton is positive while an electron is negative. Neutrons have no charge.
Answer:
Neutrons have no charge.
Explanation:
Remember it this way Neutral (neither of any side, in this case, + or +) and Neutron both have N. so Neutron is Neutral
What is the predominant intermolecular force in the liquid state of each of these compounds: hydrogen fluoride (HF), carbon tetrabromide (CBr4), and nitrogen trifluoride (NF3)? Force(s): Dipole-dipole Hydrogen Bonding Dispersion
Answers
Answer:
HF - hydrogen bonding
CBr4 - Dispersion
NF3 - Dipole-dipole
Explanation:
Hydrogen bonding occurs when hydrogen is covalently bonded to a highly electronegative atom such as fluorine, chlorine nitrogen, oxygen etc. Hence the dominant intermolecular force in HF is hydrogen bonding.
CBr4 is nonpolar because the molecule is tetrahedral and the individual C-Br dipole moments cancel out leaving the molecule with a zero dipole moment hence the dominant intermolecular force are the dispersion forces.
NF3 has a resultant dipole moment hence the molecules are held together by dipole-dipole interaction.
The predominant intermolecular force in the liquid state of the compounds are as follows:
HF - hydrogen bondingHF - hydrogen bondingCBr4 - DispersionHF - hydrogen bondingCBr4 - DispersionNF3 - Dipole-dipoleDiscussion:
Hydrogen bonding is a bonding characterized covalent bonding of hydrogen to a highly electronegative atom such as fluorine, chlorine nitrogen, oxygen etc.In essence, the dominant intermolecular force in HF is hydrogen bonding.
Carbon tetrabromide, CBr4 is nonpolar because the molecule is tetrahedral and the individual C-Br dipole moments neutralise leaving the molecule with a zero dipole moment hence the dominant intermolecular force are the dispersion forces.Nitrogen trifluoride, NF3 has its molecules held together by dipole-dipole interaction as a result of its resultant dipole moment.Read more:
https://brainly.com/question/18099727
One method for separating polypeptides utilizes their different solubilities. The solubility of large polypeptides in water depends upon the relative polarity of their R groups, particularly the number of ionized groups. The more ionized groups there are, the more soluble the polypeptide. Which of each pair of the polypeptides that follow is more soluble at the indicated pH?
a. (Phe-Met)3 or (Glu)m at pH 7.0
b. (Lys-Ala)3 or(Gly)m at pH 7.0
c. (Ala-Ser-Gly)5 or (Asn-Ser-His)5 at pH 6.0
d. (Ala-Asp-Gly)5 or (Asn-Ser-His)5 at pH 3.0:
Answers
Answer:
The definition has been defined throughout the clarification segment below, as per the provided case.
Explanation:
Polypeptides were essential amino acids although therefore realize that those acids become charged individually, provide various R groups but have specific isoelectric positions as well.
The polypeptides could be divided by analysis of multiple isoelectric points including fulfilling the following, even though a protein always at the isoelectric point seems to have the end up losing money.
At pH 7, it would be very negatively (-) charged, although (Phe-Met)₃ is even less positive and therefore less reversible. This would be strongly positively (+) charge (equatorial) around pH 7, except for the amino as well as carboxyl-terminal, then (Gly)₂₀ which again is hourly rounding. Although the carboxylate categories of Asp compounds become partly protonated although neutral throughout (Ala-Asp-Gly)₅, around pH 3, although the imidazole categories of His compounds become completely protonated although covalently bonded throughout (Asn-Ser-His)₅.About pH 6.0, only certain polymers provide covalent bonds of polar Ser, however (Asn-Ser-His)₅ does have side bonds of polar Asn as well as partly protonated peptide bonds of His.Calculate the energy of a photon having a wavelength of 7.71 x 10^-5 m.
Answers
C= light velocity 3 * 10e8 m/s
H = planck’s constant 6.626 * 10e-34 js
Now calculate 3 * 10e8 * 6.626 * 10e-34/ 7.71 * 10e-5 m
A box has dimensions: l = 10.0 cm; w = 5.0 cm; h = 2.5 cm determined by a mm ruler. Calculate
the volume of the box ± its absolute uncertainty.
Answers
Answer:
Volume of box = 125 cm³
Explanation:
Given:
Length l = 10 cm
Width b = 5 cm
Height h = 2.5 cm
Find:
Volume of box
Computation:
Volume of box = lbh
Volume of box = 10 x 5 x 2.5
Volume of box = 125 cm³
1. What process occurs along transform fault plate boundary?
Answers
Answer:
hope it helps...
Explanation:
Along the third type of plate boundary, two plates move laterally and pass each other along giant fractures in Earth's crust. Transform faults are so named because they are linked to other types of plate boundaries. The majority of transform faults link the offset segments of oceanic ridges.
Igneous intrusion D is younger than layers B, C, and E according to
Law of superposition
Law of cross-cutting relationships
Original horizontality
Uniformitarianism
Answers
Answer:
Law of cross-cutting relationships
Explanation:
This interpretation is based on the law of cross - cutting relationships.
This law states that "faults and fractures that cuts through a rock are younger than the rocks they cut through".
In a sequence of strata, the strata that are not cut through by these features are younger than the cross -cutting features. The igneous intrusion is younger since it cuts through the rock layers.in rutherford's gold foil experiment a very small number of alpha particles were deflected. what about the structure of the atoms that could have caused this?
Answers
Answer:The atom being mostly empty space. A small number of alpha particles were deflected by large angles (> 4°) as they passed through the foil. There is a concentration of positive charge in the atom. Like charges repel, so the positive alpha particles were being repelled by positive charge
Which of these is most likely observed during winter weather?
Cumulonimbus clouds
Explosive sounds
Freezing rain
Water spouts
Please Help!
Answers
Answer:
FREEZING RAIN
Explanation:
Answer:
C. freezing rain hope it helps :)
Explanation:
What is the frequency of a photon that has a wavelength of 754 um?
Answers
Answer:
0.39760273
Explanation:
I typed into calculator hope it's right.
A chemistry student named Igor was performing a titration experiment. He used 500mL of 6M sulfuric acid, H2SO4(aq) to completely neutralize a 2.00 L solution of unknown concentration sodium hydrodixe, NaOH(aq). What is the concentration of the NaOH(aq) in molarity (M)?
Answers
Answer:
3 M
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
H2SO4 + 2NaOH —> Na2SO4 + 2H2O
From the balanced equation above, the following data were obtained:
Mole ratio of the acid, H2SO4 (nA) = 1
Mole ratio of the base, NaOH (nB) = 2
Next, the data obtained from the question. This include the following:
Volume of acid, H2SO4 (Va) = 500 mL
Molarity of acid, H2SO4 (Ma) = 6 M
Volume of base, NaOH (Vb) = 2 L
Molarity of base, NaOH (Mb) =?
Next, we shall convert 2 L to millilitres (mL). This can be obtained as follow:
1 L = 1000 mL
Therefore,
2 L = 2 L × 1000 mL /1 L
2 L = 2000 mL
Thus, 2 L is equivalent to 2000 mL.
Finally, we shall determine the molarity of the base, NaOH. This can be obtained as follow:
Volume of acid, H2SO4 (Va) = 500 mL
Molarity of acid, H2SO4 (Ma) = 6 M
Volume of base, NaOH (Vb) = 2000 mL
Mole ratio of the acid, H2SO4 (nA) = 1
Mole ratio of the base, NaOH (nB) = 2
Molarity of base, NaOH (Mb) =?
MaVa / M Vb = nA/nB
6 × 500 / Mb × 2000 = 1/2
3000 / Mb × 2000 = 1/2
Cross multiply
Mb × 2000 × 1 = 3000 × 2
Mb × 2000 = 6000
Divide both side by 2000
Mb = 6000 /2000
Mb = 3 M
Thus, the molarity of the base, NaOH is 3 M.
Energy due to the position of an object is called
A. potential energy
B. conditional energy
C. kinetic energy
D. nuclear energy
Answers
because it can move, due to how it’s placed,
it has “potential” for being able to gain energy