Answer:
Cl
Explanation:
Electronegativity increases as you move up and to the right of the periodic table. For example, Florine is the most electronegative element.
a 500 kilogram sample of substance decays to 125 kilograms over a period of 21.53 years. what is the half life of the sample substance
Answer:
Half life = 10.765 year
Explanation:
Given data:
Mass of sample = 500 Kg
Mass left after 21.53 years = 125 kg
Half life of substance = ?
Solution:
At tome zero = 500 kg
At 1st half life = 500 kg/2 = 250 kg
At 2nd half life = 250 kg/2 = 125 g
Half life:
Half life = time elapsed / number of half life
Half life = 21.53 year/2
Half life = 10.765 year
Which subatomic particles are stolen and/or shared when atoms bond together during a chemical reaction?
A. protons
B. Subatomic particles are not involved in atomic bonding
C. neutrons
D. electrons
Answer:
D. electrons
Explanation:
Chemical bonds occur as a result of electrons (negatively-charged subatomic particles) being transferred among atoms. The transfer happens when electrons are being stolen or shared from an atom to another. The reason behind this is because atom's atomic shells are naturally inclined to be full. Thus, if one atom has extra electrons, that atom will most likely share his electrons to another atom lacking in it.
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Answer:
vxxbvfdb
Explanation:
Answer:
sorry dude
Explanation:
i got no clue
Question 23 (1 point)
A student is given an object with a mass of 14.8 grams. When placed into a
graduated cylinder the water level rises from 25.0 mL to 34.7 mL.
What is the density of the object and would you expect it to float or sink in the
graduated cylinder if water has a density of 1.00 g/mL? Show all of your work.
Answer:
d = 1.53 g/mL
Object will sink into water
Explanation:
Given data:
Mass of object = 14.8 g
Initial volume of water = 25.0 mL
Final volume after adding object = 34.7 mL
Density of object = ?
Density of water = 1.00 g/mL
Solution:
Volume of object = Total volume - volume of water
Volume of object = 34.7 mL - 25.0 mL
Volume of object = 9.7 mL
Density of object;
d = mass/volume
d = 14.8 g / 9.7 mL
d = 1.53 g/mL
The density of water is 1.00 g/mL which means object is heavier than water thus object will sink into the water. The object with density less than water are float in it.
Question 24 (3 points)
Choose the element below that has correct information about the number of energy
levels/orbitals: (Use a period table to answer this question).
Lithium (Li) has one energy level
Sodium (Na) has three energy levels
Potassium (K) has three energy levels
Fluorine (F) has seven energy levels.
Answer:
sodium
Explanation:
Comprehensive studies have shown that forensic scientists should look for between 8 to 16 points to establish identification
based on fingerprints.
true or false
Answer:
FALSE
Explanation:
right answer on plato:)
Which number represents an acidic pH, 4 or 9? _______ Numerical Answers Expected! Answer for Blank 1:
Answer:
4
Explanation:
pH scale of acidic is 4.
Answer: 4
Explanation:
Which statement about the relationship between laws, hypotheses, and theories is true?
Match the terms with their definitions
Frequency, Amplitude, Crest, Wavelength, Medium, Trough
Matter distributed by energy
Highest point of transverse wave
Lowest point of transverse wave
Distance between midpoint of wave and crest
Distance traveled in one wave cycle
Number of waves that pass per second
(from brainpop waves.) PLease HeLP (Worth 25 POINTS)
Answer:
amplitude= distance between midpoint of a wave and crest
crest= highest point of transverse wave
wavelength= distance traveled in one wave cycle
medium= matter distributed by energy
trough=lowest point of transverse wave
frequency=number of waves that pass per second
Explanation:
A wave is a dynamic perturbation of one or even more quantities that propagates in a specific medium.
What is wave?A wave is a dynamic perturbation of one or even more quantities that propagates in physics, mathematics, or related sciences. When waves oscillate frequently around an equilibrium position at a certain frequency, they are said to be periodic. A traveling wave is one in which the whole waveform moves inside one direction; in contrast, a standing wave is one in which two periodic waves are overlaid and move in the opposing directions.
In a wave form, there are some points in which the wave amplitude seems reduced or even zero, and these positions have null vibration amplitudes. A wave equation or perhaps a one-way wave equation describing single wave propagation inside a specific direction is frequently used to describe waves.
amplitude= distance between midpoint of a wave and crest
crest= highest point of transverse wave
wavelength= distance traveled in one wave cycle
medium= matter distributed by energy
trough=lowest point of transverse wave
frequency=number of waves that pass per second
Therefore, a wave is a dynamic perturbation of one or even more quantities that propagates
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Which of the following is an example of erosion?
water freezing inside the cracks of rocks
stalactite and stalagmite formation in caves
plant roots pressing against the sides of rocks
glaciers moving rocks and soil through a valley
Answer:
Glaciers moving rocks and soil through a valley
Explanation:
The definition of Erosion is "the process of eroding or being eroded by wind, water, or other natural agents". Which in turn means the movement of glaciers is causing erosion on the local valley.
the last one
Explanation:
Which of the following practices can help control erosion?
recycling paper
harvesting earlier
tree removal
contour plowing
Answer:
Contour plowing
Explanation:
Contour plowing is one of the activity that can help control the rate of erosion in a given place.
Erosion is the washing away of the layer of the earth. In agricultural practices, rich top soil can be eroded if adequate measures are not taken. Contour plowing is the process of planting along the sides of a ridge following the contour patterns. This helps to break down slopes and reduce erosion.Sugar(C6H1206) and salt( NaCl) are examples of
Answer:
compounds
Explanation:
It is a substance formed when two or more. When the elements are joined, the atoms lose their individual properties and have different properties from the elements they are composed of.
Answer:
Brain big big brain
Explanation:
Biggest brain small brain Big brain big stonks
Which of the following elements would you expect to lose one electron? Select all that apply.
a. sodium
b. chlorine
c. Fluorine
d. Potassium
Answer:
Potassium, sulfur, fluorine, barium
The elements that will lose one electron are:
a. sodium
d. Potassium
What will happen when an element looses one electron?An element in its natural state has an equal number of protons and electrons, giving it a net charge of zero; however, when an element loses an electron as part of a chemical reaction it becomes positively charged, or oxidized.
Out of the given options, sodium and potassium looses one electron and attains a positive charge leading to the formation of cation. While Fluorine and chlorine gains one electron and attains a negative charge leading to the formation of anion.
Thus, correct options are a and d.
Find more information about Cations here:
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During the reaction: Mg(s) + CuSO4(aq)
es)
MgSO4(aq) + Cu(s), what changes occur to magnesium?
A)Its oxidation number changes from +2 to 0 and it is reduced.
B)Its oxidation number changes from 0 to +4 and it is reduced.
C)Its oxidation number changes from 0 to +2 and it is oxidized.
D)Its oxidation number changes from +2 to +4 and it is oxidized.
Answer:
C
Explanation:
I did it on usatestprep
Compare and contrast how observations and results can be used to
support a conclusion to an experiment.
Answer:
by statistical analyses, especially by determining the p-value
Explanation:
In general, observations and results obtained from experimental procedures are subjected to a statistical test to check the robustness of the working hypothesis. The p-value is the most widely used statistical index in order to test such observations and results. The p-value is the statistical probability of obtaining extreme observed results when the null hypothesis is considered correct. A p-value lesser than 0.05 generally is considered statistically significant and then the null hypothesis can be rejected. In consequence, a very low p-value (which is obtained by statistical analysis of the observations and results), indicates that there is strong evidence in support of the alternative hypothesis.
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Answer:
1. A2. C3. BExplanation:
i hope it helps ;)
According to Boyle’s law, when the pressure of a gas increases at constant temperature, its volume
Answer:
the volume increases
Explanation:
Are bonds broken or formed, throughout each phase change present on a heating
curve?
Answer:
During a phase change no chemical bonds are broken. Atoms are not rearranged because a phase change is a physical change rather then a chemical change. However, intermolecular forces are almost entirely removed from the liquid since the intermolecular forces are what cause the liquid to be a liquid.
Explanation:the nature of the intermolecular forces (IMF) will not change when the state changes from solid to liquid, however, the number of IMF changes.
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Answer:
ill help but i cant see the problem
Explanation:
all matter has physical and chemical properties. These properties can be used to identify the type of matter. Which of these statements describe a physical property?
Explanation:
Physical properties of matte tells us everything about a substance when no change is occurring to its constituents.
Such properties are best observed with our senses. Also, physical properties can be observed using equipment in the laboratory or some apparatus.
Examples of these properties are state of matter, color, odor, taste, texture, hardness, solubility in water, melting point, boiling point, density, viscosity and spectroscopic patterns.Are bonds broken or formed, throughout each phase change present on a heating
curve?
What did J.J. Thomson discover about electrons?
a
Atoms are indivisible.
b
Electrons are inside the nucleus of an atom.
c
Electrons are scattered in a positively charged atom.
d
Atoms of the same element have the same properties.
The answer is D
Brainliest?
A food item that is left out of the refrigerator turns brown and forms bubbles and gas. What are the signs that this is a chemical reaction?
Check all that apply.
Heat is produced.
Heat is absorbed.
Bubbles appear.
A precipitate forms.
The color changes.
Answer:
C & E
Explanation:
Which virus lastes the longest in the whole history? ( Sorry, I don't have options)
Answer:
COLD AND FLU!!!!
Explanation:
Answer:
CORONAVIRUS UGH
Explanation:
5. You add 11.00 mL of 0.800 M NaOH to 50.00 mL of pure water, and to this mixture you then add 3.00 mL of 0.200 M HCl. What will be the pH of the resulting solution
Answer:
pH = 13.11
Explanation:
NaOH reacts with HCl to produce H2O and NaCl. pH depends of this reaction. The reactant in excess determine the pH of the solution:
NaOH + HCl → H2O + NaCl
1 mole of NaOH reacts with 1 mole of HCl
To determine limiting reactant we need to find moles of each reactant:
Moles NaOH:
0.011L * (0.800 mol / L) = 0.0088 moles NaOH
Moles HCl:
0.003L* (0.200mol / L) = 0.0006 moles HCl
That means limitng reactant is HCl and moles in excess of NaOH are:
0.0088moles NaOH - 0.0006 moles = 0.0082 moles NaOH =
0.0082 moles OH⁻
In 11.00mL + 50.00mL + 3.00mL = 64.00mL = 0.06400L
[OH-] = 0.0082 moles OH- / 0.064L = 0.1281M OH-
pOH = -log [OH-] = 0.89
pH = 14 - pOH
pH = 13.11Describe the source of angle strain and torsional strain present in cyclopropane
Explanation:
The angle strain arises from the compression of the ideal tetrahedral bond angle of 109.5° to 60°. The large torsional strain occurs since all CH bonds on adjacent carbons are eclipsed.
The lateral angle that decrease in the lateral angle from 109.5 to 60 degree so, these is the main source of angle strain and torsional strain present in cyclopropane.
What is angle and torsional strain?Angle strain is the term for strain that results from departure from one or more ideal bond angles. Torsional strain is a chemical compound's resistance to bond twisting. Torsional strain between the bonds occurs when atoms separated by three bonds are arranged in an unstable staggered conformation rather than an eclipsed shape.
It exists in cyclopropane because its C-C-C bond angles must not exceed 60 degrees, which is less than the optimum bond angle of 109.5 degrees for tetrahedral carbon. It is the cause of these.
We are aware that three carbon atoms in a triangle plane break the cycle and cause each carbon to be sp3 hybridized. All carbon endeavors are sp3 hybridized, and we are aware that the sp3 hybrid angle is 109 degrees, 28 minutes at 109.5 degrees. But the single angle in cyclo-propane is only 60 degrees.
Personal strain results from the bending of bonds necessary to form a new molecule. The primary source of the angle strain and torsional strain found in cyclopropane is the decrease in lateral angle from 109.5 to 60 degrees.
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You complete titration of 15.0ml of unknown acid with 14.16ml of 1.25 M NaOH. What’s the molar it’s of the unknown acid? Assume the acid is monoprotic 1 mole of acid reacts with 1 mole of base.
The molarity of the unknown acid : 1.18 M
Further explanationTitration is a procedure for determining the concentration of a solution by reacting with another solution that is known to be concentrated (usually a standard solution). Determination of the endpoint/equivalence point of the reaction can use indicators according to the appropriate pH range
Titration formula
M₁V₁n₁=M₂V₂n₂
monoprotic acid⇒n₁=1
NaOH monoprotic base⇒n₂=1
[tex]\tt M_1\times 15=1.25\times 14.16\\\\M_1=1.18~M[/tex]
Which of the following is a valid unit for specific heat?
Explanation:
The specific heat capacity is the amount of heat required to raise the temperature of 1mole or 1kg or 1g of substance by 1k or 1°C
This property is an intensive property of matter and does not depend on the quantity of matter present.
Some of the unit of specific heat are;
J/g°C, J/kg°C, J/mol°C, J/molK , Cal/g°C
The density of magnesium is 1.7/cm3, and the density of iron is 7.9g/cm3. Consider a block of iron with a mass of 819 g. What is the mass of a block of magnesium that has the same volume as the block of iron?
What is the number of neutrons in Hydrogen, O (A= 1, Z= 1)?
Answer:
Explanation:
Hydrogen has 1 proton and one nuetron
Oxygen has 8 protons nad 8 neutrons