Answer:
d) repeat
Explanation:
If the trend in a property is periodic, it means it will repeat on the periodic table.
Periodic properties on the table have a constant pattern as we move up or down a group or across a period from left to right.
This helps to predict some of the salient properties of elements as we move through the periodic table. For example, on most periodic groups, metallicity increases as we move down the group and it decreases across the period.11. What is the expression 1 in. = 2.54 cm properly called?
(a) equation
(b) conversion factor
(c) SI factor
(d) equivalence statement
Please help me thanks so much....I’ll mark you?!?!:))))
Answer:
Extreme heat
Explanation:
Because when matter is heated up The molecules move faster.
Answer:
I think it's extreme heat
Plzzzzzzzzzzz helpppppp
Answer:
True
Explanation:
If someone's genetics were Bb, B would be the dominant trait and b would be the recessive trait.
Answer:
True
Explanation:
That's how it works
A radioactive element has a half- life of 2 days. Which fraction represents the amount of an original sample of this element remaining after 6 days?
Answer : The fraction represents the amount of an original sample of this element remaining after 6 days is [tex]\frac{1}{8}[/tex] .
Explanation :
Half-life = 2 days
Time = 6 days
Formula used:
[tex]N=N_o\times (\frac{1}{2})^{(\frac{t}{t_{1/2}})}[/tex]
where,
N = final amount
[tex]N_o[/tex] = initial amount
t = time
[tex]t_{1/2}[/tex] = half-life
Now putting all the given values in the above formula, we get:
[tex]N=N_o\times (\frac{1}{2})^{(\frac{6}{2})}[/tex]
[tex]\frac{N}{N_o}=(\frac{1}{2})^{(\frac{6}{2})}[/tex]
[tex]\frac{N}{N_o}=(\frac{1}{2})^3[/tex]
[tex]\frac{N}{N_o}=\frac{1}{8}[/tex]
Therefore, the fraction represents the amount of an original sample of this element remaining after 6 days is [tex]\frac{1}{8}[/tex] .
Which of the following are indicators of a chemical change select all that apply
Answer: 1.color change
2.temperature change
3. precipitate formation
4.gas formation
Explanation: There is no pic
Plzzzzzz helppppppppp
Answer:
a. true
jekskjsskakskkskal2bwh yes
Answer:
True
Explanation:
Phenotype is physical trait, genotype is letter representing, (tt, TT)
An force results when one force is stronger than other forces
and the motion of an object is affected
When two equal forces act in opposite directions the result is that the forces are balanced and there is no motion. The process of moving or changing position. When one force is stronger than the other the result is motion.
An force results when one force is stronger than other forces and the motion of an object is affected is unbalanced force.
What is force?A force is an influence in physics that can change the motion of an object. A force can cause a mass object to change its velocity, or accelerate.
The forces are balanced if the people on each side of the rope pull with equal strength but in opposite directions.
As a result, there is no movement. Forces that are in balance can cancel each other out. The object does not move when there is a balanced force.
Forces out of balance, If one force is stronger than the others and their effects do not cancel out, the forces are unbalanced. Unbalanced forces alter motion, speed, and/or direction. A greater force results in a greater change in motion.
Thus, the answer is unbalanced force.
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Hurry it’s for a test!! The arctic fox and gray wolf are two examples of
animals that change the color of their fur with the
seasons. In the summer, the animals are a brownish
color, and in the winter, they turn white. The
change of color helps the animals to survive.
Which of the following provides the best explana-
tion for this change?
A The color change helps them raise their young.
B The color change helps protect them from
predators.
The color change helps them be seen from a
great distance.
D The color change helps them regulate their
body temperature better.
the kenetic energy of an object always depends on which property?
what is the basic principle of chromatography process
process by which one separates compounds from one another by passing a mixture through column that retains some compounds longer than others.
What does point of view refer to?
the purpose of whoever is telling the story
the age of whoever is telling the story
the perspective of whoever is telling the story
Answer:
I'd say the most reasonable answer is perspective.
Explanation:
"Point of view" is about who is telling and sharing the details in what you are writing or reading. I'm not 100% sure because the word "perspective" doesn't seem like the right word to use, but it's better than the other two in my opinion.
The mass of a deuterium nucleus 21H is less than its components masses. Calculate the mass defect.________ amu
Answer:
The mass defect of a deuterium nucleus is 0.001848 amu.
Explanation:
The deuterium is:
[tex]^{A}_{Z}X \rightarrow ^{2}_{1}H [/tex]
The mass defect can be calculated by using the following equation:
[tex]\Delta m = [Zm_{p} + (A - Z)m_{n}] - m_{a}[/tex]
Where:
Z: is the number of protons = 1
A: is the mass number = 2
[tex]m_{p}[/tex]: is the proton's mass = 1.00728 amu
[tex]m_{n}[/tex]: is the neutron's mass = 1.00867 amu
[tex]m_{a}[/tex]: is the mass of deuterium = 2.01410178 amu
Then, the mass defect is:
[tex]\Delta m = [1.00728 amu + (2- 1)1.00867 amu] - 2.01410178 amu = 0.001848 amu[/tex]
Therefore, the mass defect of a deuterium nucleus is 0.001848 amu.
I hope it helps you!
Answer:
0.002389
Explanation:
Use the equation the other person used to answer but with the numbers that are given on this assignment!
An example of a chemical change A. Fireworks B. Chemical reaction C. Chemical change D. Energy
Do Covalent bonds have weaker or stronger chemical bonds than Ionic bonds?
Ionic bonds are stronger than covalent bonds since they are of opposite charges. This makes them more attracted to each other, creating bonds that are harder to break. Covalent bonds don't have this and only occur to share electrons between atoms.
I hope this helps!
Is the enzyme lactase a catalyst? why or why not?
Answer:
Explanation:
The enzyme lactase acts as a catalyst to facilitate the reaction and make it happen very quickly. This enzyme is made u.
do the rest
hope it helps
Enzyme lactase catalyzes the hydrolysis of the glycosidic bond of lactose to form galactose and glucose.
What is lactase?Lactase can be described as an enzyme produced by many organisms. Lactase is located in the small intestine of humans and other mammals. It is essential to accomplish the digestion of milk and it breaks down lactose that gives milk its sweetness.
A person with a deficiency of lactase, and who consume dairy products, may experience the symptoms of lactose intolerance. Lactase is a part of the β-galactosidase family of enzymes and is a glycoside hydrolase involved in the hydrolysis of lactose into constituent galactose and glucose monomers.
The β-glycosidic bond in D-lactose in metabolism is hydrolyzed to form D-galactose and D-glucose, which can be absorbed into the bloodstream. The optimum temperature of the human lactase is about 37 degrees Celcius and the optimum pH of the human lactase is equal to 6.
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g Does a reaction occur when aqueous solutions of chromium(III) sulfate and ammonium phosphate are combined
Answer:
See explanation
Explanation:
The reduction potential of Cr III is more negative than that of NH4+ hence NH4+ will be displaced by Cr III from a solution of its salt according to the following reaction equation;
Cr2(SO4)3 + 2(NH4)3PO4--------->2CrPO4 + 3(NH4)2(SO4)
Hence;
A reaction occurs when aqueous solutions of chromium(III) sulfate and ammonium phosphate are combined.
The raw water supply for a community contains 18 mg/L total particulate matter. It is to be treated by addition of 60 mg alum (Al2(SO4)3 14H2O) per liter of water treated. Essentially, all the added alum precipitates represented by the following reaction:
Required:
a. For a total flow of 8000 m^3/d, compute the daily alum requirement and the concentration of solids in the water following alum addition, assuming the alum all precipitates as Al(OH)3(s).
b. The water is initially at pH 7.5 and has ALK=40 mg/L as CaCO3. It is desired to maintain solution pH at 6.5 or higher. Will the pH be in the acceptable range after the chemical addition and Al(OH)3(s) precipitation?
c. What will the pH be if the treated solution is bubbled with air, so that it reached equilibrium with atmospheric CO2?
Solution :
Given :
The steady state flow = 8000 [tex]$ m^3 /d $[/tex]
[tex]$= 80 \times 10^5 \ I/d $[/tex]
The concentration of the particulate matter = 18 mg/L
Therefore, the total quantity of a particulate matter in fluid [tex]$= 80 \times 10^5 \ I/d \times 18 \ mg/L $[/tex]
[tex]$= 144 \times 10^6 \ mg/g$[/tex]
[tex]$= 144 \ kg/d $[/tex]
If 60 mg of alum [tex]$ [Al_2(SO_4)_3.14 H_2O] $[/tex] required for one litre of the water treatment.
So Alum required for [tex]$ 80 \times 10^5 \ I/d $[/tex]
[tex]$= 80 \times 15^5 \ I/d \times 60 \ mg \ alum /L$[/tex]
[tex]$= 480 \times 10^6 \ mg/d $[/tex]
or 480 kg/d
Therefore the alum required is 480 kg/d
1 mg of the alum gives 0.234 mg alum precipitation, so 60 mg of alum will give [tex]$ = 60 \times 0.234 \text{ of alum ppt. per litre} $[/tex]
[tex]$= 14.04 $[/tex] mg of alum ppt. per litre
480 kg of alum will give = 480 x 0.234 kg/d
= 112.32 kg/d ppt of alum
Daily total solid load is [tex]$= 144 \ kg/d + 112.32 \ kg/d$[/tex]
= 256.32 kg/d
So, the total concentration of the suspended solid after alum addition [tex]$= 18 \ mg/L + 60 \times 0.234 $[/tex]
= 32.04 mg/L
Therefore total alum requirement = 480 kg/d
b). Initial pH = 7.4
The dissociation reaction of aluminium hydroxide as follows :
[tex]$Al(OH)_3 \rightleftharpoons Al^{3+} + 3OH^{-} $[/tex]
After addition, the aluminium hydroxide pH of water will increase due to increase in [tex]$ OH^- $[/tex] ions.
Therefore, the pH of water will be acceptable range after the addition of aluminium hydroxide.
c). The reaction of [tex]$CO_2$[/tex] and water as follows :
[tex]$CO_2 (g) + H_2O (l) \rightarrow H_2CO_3$[/tex]
For the atmospheric pressure :
[tex]$p_{CO_2} = 3.5 \times 10^{-4} \ atm $[/tex]
And the pH is reduced into the range of 5.9 to 6.4
If a dog has a mass of 16.1 kg, what is its mass in the following units? Use scientific notation in all of your answers.
g
mg
ug
Answer:
[tex]16.1\times 10^3\ \text{g}[/tex]
[tex]16.1\times 10^{6}\ \text{mg}[/tex]
[tex]16.1\times 10^{9}\ \mu\text{g}[/tex]
Explanation:
Mass of dog = [tex]16.1\ \text{kg}[/tex]
[tex]1\ \text{kg}=10^{3}\ \text{g}[/tex]
[tex]1\ \text{kg}=10^{6}\ \text{mg}[/tex]
[tex]1\ \text{kg}=10^{9}\ \mu\text{g}[/tex]
So,
[tex]16.1\ \text{kg}=16.1\times 10^3\ \text{g}[/tex]
[tex]16.1\ \text{kg}=16.1\times 10^{6}\ \text{mg}[/tex]
[tex]16.1\ \text{kg}=16.1\times 10^{9}\ \mu\text{g}[/tex]
Mass of the dog in the other units is [tex]16.1\times 10^3\ \text{g}[/tex], [tex]16.1\times 10^{6}\ \text{mg}[/tex] and [tex]16.1\times 10^{9}\ \mu\text{g}[/tex].
Please help me thanks so much....I’ll mark you?!?!:)))) ( 32 points)
Answer:
I believe it's chemical
Answer:
physical
Explanation:
it's not changing form or substance
3. What are the products of the following reaction?
H2SO4 + KOH --> *
A) H2 + K2904
B) H2O + K2SO4
C) HK + HSO4
D) H2O + KS04
Answer:
H2SO4 + 2KOH -------> K2SO4 + 2H2O
Explanation:
What type of energy does the
mitochondrion provide the cell?
chemical energy (ATP)
light energy
thermal energy
sound energy
The answer is multiple choice
Answer:
Thermal
Explanation:
I think im not quite sure but since thermal is basically heat energy, I assume it would be thermal energy
What is the function of mitochondria in plant and animal cells?
A
It receives and removes wastes.
B
It functions in making RNA and DNA.
C
It is the location of cellular respiration and produces ATP.
D
It provides a barrier between the inside and the outside of the cell.
What is a renewable energy source that is captured using the heat of the Earth? I need quick answers so please answer ASAP.
Explanation:
Geothermal energy
Classify the following alcohol as primary secodary or tertiary
CH3CH2CH2OH
Answer:
The answer would be letter A
Explanation:
The answer is primary
There are three types of alcohol one is primary second is secondary and third is tertiary. Therefore, the given alcoholic compound CH[tex]_3[/tex]CH[tex]_2[/tex]CH[tex]_2[/tex]OH is a primary alcohol.
What is alcohol?Alcohol is a chemical molecule with a functional group called hydroxyl linked to a saturated carbon atom.
Alcohols classified as primary have just one alkyl group on which the carbon atom of the hydroxyl group (OH) is connected. Secondary alcohols are those that have two alkyl groups on either side of the carbon atom of the hydroxyl group. In tertiary alcoholic group, the carbon that is bonded to hydroxyl group is bonded to three alkyl groups. the given alcoholic compound CH3CH2CH2OH is a primary alcohol.
Therefore, the given alcoholic compound CH3CH2CH2OH is a primary alcohol.
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i need help ......................................
Answer
One of them is a Solid and one of them is a liquid and the other one is air
Explanation:
Which factor is a biotic factor of an ecosystem?
Answer:
what are your choices
Explanation:
because I can help you
Answer: the bacteria that live in the intestine of a rabbit
Explanation:
thats the answer if ur quiz/test is same as mine
Aqueous solutions of Na2CO3 and Ca(NO3)2, 0.10 M each, are combined. A white precipitate is observed in the container after mixing. The precipitate is filtered and carefully rinsed with distilled water to remove other ions. A sample of the precipitate is added to 100 mL of 0.1 M NaCl. A second sample of the precipitate is then added to 100 mL of 0.1 M HCl. What would be observed in each case
The question is incomplete. Here is the complete question.
Aqueous solutions of [tex]Na_{2}CO_{3}[/tex] and [tex]Ca(NO_{3})_{2}[/tex], 0.10 M each, are combined. A white precipitate is observed in the container after mixing. he precipitate is filtered andcarefully rinsed with distilled water to remove other ions. A sample of the precipitate is added to 100 mL of 0.1 M NaCl. A second sample of the precipitate is then added to 100 mL of 0.1 M HCl. What would be observed in each case?
Observation upon Observation upon
addition of precipitate addition of precipitate
to NaCl(aq) to HCl(aq)
(A) additional precipitates forms no visible reaction occurs
(B) no visible reaction occurs gas is produced and some precipitate dissolves
(C) no visible reaction occurs no visible reaction occurs
(D) additional precipitates forms gas is produced and some
precipitate dissolves
Answer: (B) No visible reaction occurs; Gas is produced and some precipitate dissolves
Explanation: When aqueous solutions of [tex]Na_{2}CO_{3}[/tex] and [tex]Ca(NO_{3})_{2}[/tex] are combined, it reacts according to the following balanced equation:
[tex]Na_{2}CO_{3}+Ca(NO_{3})_{2}[/tex] → [tex]CaCO_{3}_{(s)}+2NaNO_{3}_{(aq)}[/tex]
forming calcium carbonate ([tex]CaCO_{3}[/tex]), which, as it is insoluble in water, precipitates as a solid of the color white. This process is Precipitation and this reaction is a Precipitation Reaction.
When calcium carbonate reacts with NaCl it produces:
[tex]CaCO_{3}+2NaCl[/tex] → [tex]CaCl_{2}+Na_{2}CO_{3}[/tex]
Now, calcium chloride is an inorganic compound very soluble in water, so, in this reaction, there are no precipitate and no visible reaction occurs.
When [tex]CaCO_{3}[/tex] reacts with hydrochloridric acid, the balanced reaction is
[tex]CaCO_{3}+2HCl[/tex] → [tex]CaCl_{2}+H_{2}CO_{3}[/tex]
which, also produces calcium chloride and carbonic acid.
Both are soluble in water but, when carbonic acid is in an "aqueous state", carbonic acid, it dissociates, forming carbon dioxide and water. Therefore, gas is produced and some precipitate dissolves.
In conclusion, sentence B is the correct alternative.
when aqueous solutions of sodium hypochlorite and nitric acid are mixed, an aqueous solution of sodium nitrate and hypochlorous acid results. Write the net ionic equation for the reaction.
Answer:
H+ (aq) + ClO- (aq) ---> HClO(aq)
Explanation:
The net ionic reaction equation is a chemical equation that explicitly shows only the particular ions that undergo a chemical change in the course of a given reaction.
In this particular reaction, the molecular reaction equation is shown as follows;
HNO3(aq) + NaOCl(aq) -----------> NaNO3(aq) + HOCl(aq)
Ionically;
H+ (aq) + ClO- (aq) ---> HClO(aq)
Glycolysis occurs during the second stage of cellular respiration. *
1 point
True
False
Which process causes earth surface to warm
