Answer:
B. Wild Pigs!!!!!!!!
The maximum level of lead allowed in drinking water is 15 mg/kg. What is this concentration in units of parts per million?
Lead is a heavy metal that is present in drinking water in specific small amounts. The maximum amount of lead allowed in drinking water in parts per million is 15 ppm. Thus, option A is correct.
What are parts per million?Parts per million (ppm) is the unit of expressing the mass of the substance with respect to the volume of the solution. It is generally used to represent the concentration of the contaminants or chemicals.
Given,
Mass of lead (Pb) = 15 mg
Volume/mass of water = 1 kilogram
The concentration of lead is calculated as,
Mass of Lead x 10⁶ ÷ Mass of water
=15 × 10⁶ ÷ 1000000
= 15 mg/kg
As it is known that 1 ppm = 1 mg/Kg
So, 15 mg/kg = 15 ppm
Therefore, option A. the maximum level of lead allowed in drinking water is 15 ppm.
Learn more about parts per million here:
https://brainly.com/question/16727593
#SPJ2
Your question is incomplete, but most probably your full question was, The maximum level of lead allowed in drinking water is 15 mg/kg. What is this concentration in units of parts per million?
15 ppm1.5 × 10⁻² ppm1.5 × 10⁴ ppm3.1 ppmHow will you describe the difference between heat and temperature?
Answer:
Heat: It is a form of internal energy* obtained because of the random motion and the attractive force of molecules within the substance.
Temperature: It is a quantity that determine which direction the heat energy will flow in.
Explanation:
How many liters of oxygen (at STP) are required to form 10.5 grams of hydrogen
Answer:
You'd need 6.55 L of oxygen at STP to form that much water.
Explanation:
A bowling ball and basketball collide, what direction do they go and how is energy transferred?
Answer:
When the batter hits the ball, there is a force applied, and energy is transferred. The ball will move in the direction the force is pushing it. If two objects collide, energy will be transferred between both, and there will be a change in motion.
Explanation:
How do plants and animals react to changing environments?
Pls help me I will give you 10 points
The correct electron configuration is....
A)Electrons can go where they like.
B) Shell 1=2, Shell 2=8, Shell 3=8, Shell 4=18.
C) Shell 1-8, Shell 2=2, Shell 3=8, Shell 4=18
Answer:
C) Shell 1-8, Shell 2=2, Shell 3=8, Shell 4=18
When your grandparents were growing up, they ate
mostly foods grown or produced near them. Describe how the
food you eat is different from the food your grandparents ate
as a result of science’s impact on agriculture and transportation
Why do you think it is necessary to break up the fat into tiny droplets?
How could you explain why soap is able to clean the oil and dirt off our bodies?
Answer:
for the first question, the context is necessary in order to answer...
Fat is immiscible (does not mix) with water because fat is nonpolar and water is polar (remember like dissolves like: polar mixes with polar, nonpolar with nonpolar).
soap bubbles by having many soap molecules surround fat molecules with their nonpolar end, and direct their polar ends outwards.
For your second question:
Dirt and oil are nonpolar. When we wash our bodies with water (which is polar) it does not do a good job in removing these nonpolar molecules. Soap, on the other hand, has a long nonpolar end and a small polar end. The nonpolar end of the soap molecule attaches to the dirt and oil on your skin and when the water from the shower head hits the soap, it pulls the dirt, oil, and soap off of you by attaching itself to the polar end of the soap molecule.
Explanation:
Which statement about the fossil record is correct?
Answer: most specimen that have lived on earth is still living here on earth
Explanation:
The statement correct about fossil record is option b. Extinction is rare a rare event and rarely seen in the fossil records.
What is fossil records?Fossils are the preserved remains of decomposed plants and animals. There are mainly two types of fossils namely , body fossils and trace fossils. Body fossils include bones, skull, and other body parts.
Trace fossils are traces of some actions of organisms that lived in earth. For example foot prints, caves, shells etc. The entire fossils—both known and unknown—along with their placement in strata and fossiliferous rock formations are collectively referred to as the fossil record.
The fossil record was one of the earliest data sources used to support the study of evolution and is still important for understanding the evolution of life on Earth. Geologists can now calculate the numerical or absolute age of different strata. It records extinction of some animals and plants as rare event.
Find more on fossil records:
https://brainly.com/question/11830342
#SPJ2
What is the mass of 4.76 moles of lithium phosphate
Answer:
The mass of 4.76 moles lithium phosphate is 551.16 grams.
Explanation:
Given that,
Number of moles, n = 4.76
We need to find the mass of 4.76 moles of lithium phosphate.
The chemical formula of lithium phosphate is Li₃PO₄.
Mass of Li₃PO₄ will be :
Li₃PO₄ = 3(6.941) + 30.97+4(16)
= 115.79 g/mol
The number of moles is given by :
[tex]n=\dfrac{m}{M}\\\\m=n\times M\\\\m=4.76\times 115.79\\\\m=551.16\ g[/tex]
So, the mass of 4.76 moles lithium phosphate is 551.16 grams.
Water (3010 g ) is heated until it just begins to boil. If the water absorbs 5.79x105 J of heat in the
process, what was the initial temperature of the water?
Answer:
54 °C
Explanation:
Step 1: Given and required data
Mass of water (m): 3010 gHeat absorbed (Q): 5.79 × 10⁵ JSpecific heat of water (c): 4.184 J/g.°CInitial temperature (T₁): ?Final temperature (T₂): 100 °C (Boiling point of water)Step 2: Calculate the initial temperature of water
We will use the following expression.
Q = c × m × (T₂ - T₁)
5.79 × 10⁵ J = 4.184 J/g.°C × 3010 g × (100 °C - T₁)
T₁ = 54 °C
which gas is used in flying balloons ?
Answer:
hydrogen
Explanation:
can i have brainliest please
How acidic buffer resist change in pH on addition of acid and base.
Answer:
Buffers are solutions that resist changes in pH, upon addition of small amounts of acid or base. The can do this because they contain an acidic component, HA, to neutralize OH- ions, and a basic component, A-, to neutralize H+ ions. Since Ka is a constant, the [H+] will depend directly on the ratio of [HA]/[A-].
hope it's help
#carryONlearningwhat is the electron dot structure of AsClBr2? Pls pls pls help me
Answer:
Explanation:
Sorry, I don't really know about this. I hope it helps!
1. If humans increase the amount of carbon dioxide in Earth's atmosphere, what will
happen to the average temperature on Earth?
Answer:
The average temp will increase
Explanation:
Carbon dioxide levels will cause global warming to increase and therefore the temp will increase
Hope this helps :)
How many moles of lithium fluoride (LiF) are in a 8.5 g sample?
Which Kingdom does the organism belong to?
Animalia
Protista
Fungi
Plantae
pls help guys
as a rollercoaster goes downhiQuestion 2 options:
kinetic energy is converted into potential energy
potential energy is converted into kinetic energy
electrical energy is converted into potential energy
potential energy is converted into electrical energy
ll
Answer:
b potential hope this is right
Scientists are unable to research the organs, tissues, and cells of early organisms as these parts are rarely fossilized. Which is one reason for the lack of these fossilized parts?
Answer:
A. These parts quickly decompose.
Explanation: This is because organs are made of tissues that decompose more quickly than bone. Animals mainly eat the organs and tissues of another, not the bones. This results in quick destruction of these parts that are left behind.
Have a blessed day/night! Please mark brainliest if correct! <3
The reason for the lack of these fossilized parts is that these part quickly decompose. Hence option A is correct.
What is fossilization?Fossilization is defined as the mechanisms that are physical, chemical, and biological that result in the long-term preservation of plant and animal remnants. Fossilization is a negative representation of the creature preserved in the substrate as a fossil. Any preserved remains, impression, or trace of a once-living thing from a previous geological age is referred to as a fossil.
Decomposition is defined as the method through which decomposing organic matter yields more basic organic or inorganic elements . The process of recycling nutrients that have been consumed by an organism to create its body begins with decomposition. It is the process through which the dead tissues disintegrate and change into more basic organic forms.
Thus, the reason for the lack of these fossilized parts is that these part quickly decompose. Hence option A is correct.
To learn more about fossilization, refer to the link below:
https://brainly.com/question/6867325
#SPJ6
Is seeing your breath in the cold air conduction, convection or radiation?
Answer:
convection cause it is vapor
Explanation:
Which statement explains whether NaCl or BeO will have a stronger bond?
a
BeO will have a stronger bond because it has a larger ionic charge, and a smaller distance between ions.
b
NaCl will have a stronger bond because it has a smaller ionic charge, and a larger distance between ions.
c
NaCl will have a stronger bond because it has a smaller ionic charge, and a smaller distance between ions.
d
BeO will have a stronger bond because it has a smaller ionic charge, and a smaller distance between ions.
Answer:
C
Explanation:
The statement that explains whether NaCl or BeO will have a stronger bond is D. BeO will have a stronger bond because it has a smaller ionic charge, and a smaller distance between ions
A chemical bond simply means the attraction between ions, atoms, or molecules which then leads to the formation of chemical compounds.
It should be noted that Beryllium oxide with the chemical formula BeO has a stronger bond than Sodium Chloride due to the fact that it has a smaller ionic charge, and a smaller distance between ions
Read related link on:
https://brainly.com/question/2222562
What is weather?
a
The atmospheric conditions over many days, weeks, months, and years.
b
The atmospheric conditions for a particular moment in time.
c
The atmospheric conditions forecasted for the next season.
look at the four chemical reactions
reaction 1:4Na + O ▾ 2 -->2Na ▾ 2O
Reaction 2: 2NaCl—> 2Na+Cl ▾2
reaction 3: CaCO ▾3 —> CaO +CO ▾2
reaction 4: 2KCIO3 ▾3 —> 2KCI + 3O ▾2
which statement identifies the reaction that is different from the rest and explains correctly why it is different?
A.) Reaction 2, because two ions are interchanged
B.) Reaction 2, because two products are formed
C.) Reaction 1, because a single product is formed
D.) Reaction 1, because a single ion is replaced in a compound
Reaction 1 is the one that is different because there is only one product (option C).
In a reaction, there are two main components:
The reactants: Substances at the beginning of the reaction.The products: Substances at the end of the reaction.Moreover, a reaction can include two or more reactants as well as two or more products depending on the substances involved. Let's analyze reaction 1:
Reaction 1: 4Na + O2 → 2Na2OReactants: 4Na and O2Product: 2Na2OThis means in this reaction there is only one product. This does not occur in reactions 2, 3, and 4 because in these there are two products.
Learn more about chemical reactions in: https://brainly.com/question/16416932
Explain why the pressure of a gas increases when its volume decreases.
HELP
Answer:
The gas pressure is raised by decreasing the volume of a gas. ... The particles can collide more often with the walls of the container because the volume has decreased. They exert force on them each time they collide with the walls. More collisions mean more force, so it will increase the strain.
hope this helped :)
If the initial temperature of a movable cylinder was 50 degrees Celsius
with a pressure of 2 ATM and an initial volume of 5 Liters,
what would the new volume be if the temperature was lowered to O
degrees Celsius and the pressure was reduced to 1 ATM?
Answer:
8.45 L
Explanation:
From the question given above, the following data were obtained:
Initial temperature (T₁) = 50 °C
Initial pressure (P₁) = 2 atm
Initial volume (V₁) = 5 L
Final temperature (T₂) = 0 °C
Final pressure (P₂) = 1 atm
Final volume (V₂) =?
Next, we shall convert celsius temperature to Kelvin temperature. This can be obtained as follow:
T(K) = T(°C) + 273
Initial temperature (T₁) = 50 °C
Initial temperature (T₁) = 50 °C + 273
Initial temperature (T₁) = 323 K
Final temperature (T₂) = 0 °C
Final temperature (T₂) = 0 °C + 273
Final temperature (T₂) = 273 K
Finally, we shall determine the new volume. This can be obtained as follow:
Initial temperature (T₁) = 323 K
Initial pressure (P₁) = 2 atm
Initial volume (V₁) = 5 L
Final temperature (T₂) = 273 k
Final pressure (P₂) = 1 atm
Final volume (V₂) =?
P₁V₁ / T₁ = P₂V₂ / T₂
2 × 5 / 323 = 1 × V₂ / 273
10 / 323 = V₂ / 273
Cross multiply
323 × V₂ = 10 × 273
323 × V₂ = 2730
Divide both side by 323
V₂ = 2730 / 323
V₂ = 8.45 L
Thus, the new volume is 8.45 L
The type of neuron that carries impulses from the brain are...
What is the Lewis dot structure for calcium hydroxide
Answer:
Calcium hydroxide is formed by one Ca2+ cation and two OH− anions, which implies that its chemical formula will be Ca(OH)2.
Here's how you'd figure this out. If you look at the periodic table, you'll see that calcium is in group 2. That means that it has two valence electrons that it must give up in order to be stable.
On the other hand, oxygen is in group 6, which means it needs 2 electrons in order to be stable. It gets one electron from a hydrogen atom to form an OH− anion. Now it only needs one more electron, which it gets from the two calcium has to offer.
This means that you'd need two OH− groups to form calcium hydroxide, since each OH− group would get one electron from calcium → Ca(OH)2.
hope this helped
why are oxidation numbers assigned to the elements before writing a chemical formula
Answer:
Oxidation numbers assign ownership of the electrons to one atom or another in a compound. ... Scientists use these numbers to help name compounds, write formulas and balance chemical equations. They are also useful when studying reactions and they can help you identify when something is oxidized or reduced.
How many moles of oxygen are needed to react with 3.24 moles of ammonia?
Answer:
12 mol
Explanation: