Answer:
A- Perform an experiment
Explanation:
Ava's best friend has an indoor cat. Ava notices that she sneezes every time that she visits her friend. Ava suspects
that she is allergic to cats but is unsure. What is the best thing for Ava to do next?
O Stop visiting her friend.
O Conclude that she is allergic to cats, and avoid them completely
O Test her suspicion by checking to see whether other cats also make her sneeze,
O Assume that the sneezing has another cause, and reject her original idea.
Answer:
test her suspicion by checking to see whether other cats also make her sneeze
ri
1. Among these which is the example of compound?
a) sulphur
b) iron
c) ammonia
der
Answer:
Ammonia is a compound.
Explanation:
A compound is composed of two or more separate elements. Ammonia is NH3, which happens to be two different elements.
What is the number at the end of an isotope's name?
O atomic number
O neutron number
O mass number
O electron number
Answer:
c. mass number
Explanation:
Answer:
c mass number tell me if its right
Explanation:
Sulfur hexachloride is an ionic compound. True False
Sulfur hexachloride is not an ionic compound, it is a covalent compound.
Ionic compounds are formed by the bond of metals with nonmetals, in which metals lose electrons to nonmetals that gain electrons. In that way, they all complete their octets.
Covalent compounds are formed by the bond between nonmetals, in which both nonmetals share pairs of electrons to complete their octets.
Sulfur hexachloride (SCl₆) is formed by 2 nonmetals, sulfur and chlorine. Thus, it is not an ionic compound but a covalent one.
Sulfur hexachloride is not an ionic compound, it is a covalent compound.
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Which acid-base pairs would be best for preparing a buffer solution with a PH of 8.15?
Answer:
HCN - CN⁻ (pair #4)
Explanation:
Hello,
In this case, for the selection of best pair for the preparation of the buffer solution with a pH of 8.15 we need to look for the one having the pKa closest to the required pH, considering the Henderson-Hasselbach equation:
[tex]pH=pKa+log(\frac{[base]}{[acid]} )[/tex]
In such a way, among the options, the pair HCN - CN⁻ (#4) has a pKa of 9.39 which is the closest in comparison to the others, taking into account the we will look for a [base]/[acid] ratio approaching 1.
Best regards.
Give a systematic name for the following compound: CH3CH2CHCH2CHCH3, with a CH3 group attached to the third (from left to right) carbon and a Br atom attached to the fifth carbon.
Answer:
2-bromo-4 methylheane
Explanation:
Numbering from right to left, the bromine atom falls on the second (2) carbon, while the methyl branch on the 4th.
The systematic naming (IUPAC) of haloalkanes follows the alphabetical rule in naming the substituents, be it alkyl groups or halogens.
I hope the explanation would suffice.
Which describes the correct procedure when converting a number from scientific notation to standard notation? A If the power of 10 is positive, move the decimal point to the left. BIf the power of 10 is positive, move the decimal point to the right. CIf the number being converted is greater than 10, move the decimal point to the left. DIf the number being converted is greater than 10, move the decimal point to the right.
Answer:
I think it's B
Explanation:
I think it is b because if the number is positive the zeroes will be on the left so you move the decimal to the right to get rid of the zeroes.
2 N2 (g) + O2 (g) ---> 2 N2O (g) H= +163.2 kj/mol
How much heat is required to produce 25.0 g of N2O by this reaction? Show all calculations.
Answer:
46.3 kJ
Explanation:
Step 1: Write the thermochemical equation
2 N₂(g) + O₂(g) ⇒ 2 N₂O(g) ΔH= +163.2 kJ/mol
Step 2: Calculate the moles corresponding to 25.0 g of N₂O
The molar mass of N₂O is 44.01 g/mol.
25.0 g × (1 mol/44.01 g) = 0.568 mol
Step 3: Calculate the heat released when 0.568 moles of N₂O are produced
According to the thermochemical equation, 163.2 kJ are required per 2 moles of N₂O.
0.568 mol × (163.2 kJ/2 mol) = 46.3 kJ
What does science mean to you
Answer:
Sample Essay On What Science Means to You. ... Entire knowledge acquired through science is about discovering truths, finding facts, uncovering phenomenon hidden by the nature. Observations and experimentation, in science, support in describing truth and realities through systematic processes and procedures.
Explanation:
Science is the pursuit and application of knowledge and understanding of the natural and social worlds according to systematic and evidence-based methodologies. Scientific methodologies include: Objective Observations: Measurements and Data (Math may be used as a tool, but not always)
What is the importance of science in our lives?Science plays an important role in our daily lives. It made our lives easier and more convenient. Science is just a systematic way of knowledge and life. The exploratory, careful and careful observation of changes in natural events by humans has produced science and scientific research.
Science plays an important role in our daily lives. It made our lives easier and more convenient. Science is nothing but a systematic way of knowledge and life. The exploratory, careful and careful observation of changes in natural events by humans has produced science and scientific research.
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#SPJ2
Calculate the mass of 2.500 mol of magnesium hydroxide.
Answer:145g
Explanation:
f the toxic quantity is 1.5 g of ethylene glycol per 1000 g of body mass, what percentage of ethylene glycol is fatal
Answer:
0.15%
Explanation:
mass of ethylene glycol per 1000 g = 1.5 g
percentage of ethylene glycerol that is fatal = gram of ethylene/gram of the body
==> 1.5/1000 x 100% = 0.15%
if i weigh 180 pounds on earth, what will i weigh on the moon?
Answer:
about 30 pounds
Explanation:
The mass of someone on the Moon would be 1/6 of the weight of Earth.
So, 180 ÷ 1/6 = 30.
Hope this helps you!
The answer is 30 pounds because if you weigh an amount of mass on the etah you will weigh 1/6 of it on the moon.
For the experiments from 1-3 with the same temperature change, what other parameters are the same at the initial reaction conditions?
a. mmol HCl total mL solution
b. mmol NaOH Initial concentration of NaOH
c. mL H2O Initial concentration of HCl
Answer:
The following parameters:
total mL solution mmol NaOH initial concentration of NaOHExplanation:
The options have been incorrectly arranged in the question statement given here. The three conditions mentioned above are what would be observed to remain the same when this experiment is carried out.
Two cars of mass 3000 kg are 2 m apart. What is the force of gravity between the two?
Abby fills a graduated cylinder with 3 mL of water. She then drops a
small rock into the cylinder, and the water level rises to the 5 ml
mark. What is the volume of the rock?
mL
Answer: 2ML
Explanation: all you needed to do was to subtract
For the neutralization reaction between methylamine and acetic acid, draw curved arrows to indicate the direction of electron flow. Draw curved arrows to show the movement of electrons in this step of the mechanism.
Answer:
This is required answer.
Explanation:
Given that,
The neutralization reaction between methylamine and acetic acid
We know that,
According to proton theory of acid and base,
An acid is a substance which denotes the hydrogen as proton.
Base is a substance which accept the proton.
We need to draw curved arrows to indicate the direction of electron flow
According to diagram,
Diagram shows the movement of electrons in this step of the mechanism.
Hence, This is required answer.
Which question can be answered by science A:which type of candy taste best B:which kind of backpack do students purchase most often C:why are children happy when they get home D:why should we help those less fortunate than us
Answer:B: Which type of backpack do students purchase most often
Explanation: The right answer is B. because its a question you can graph informational data about, unlike any other answer. Hope this helped!
~Emilie Greene
Obtain a box of breakfast cereal and read the list of ingredients. What are four chemicals from the list? a. monoglycerides.b. cocamide DEA.c. folic acid.d. iron.e. chromium ion.f. peroxide.g. lauryl glucoside.h. disodium phosphate.
Answer:
The options are a, c, d and h
Explanation:
The following ingredients can be found in a packaged food cereal
Monoglycerides are used as emulsifiers and they are also added to cereals to improve there texture and shelf-life.
Folic acid or folate is a vitamin that most cereals are fortified with to act as dietary supplement.
Iron is an essential mineral element, meaning your body needs it (basically for blood production). Cereals are usually fortified with iron for this reason.
Disodium phosphate is also a food additive used to improve the quality of food and is also found in cereals.
Empirical evidence about rocks might be collected by a blank doing blank
Answer:
Researchers gather empirical evidence through experimentation or observation. Empirical evidence is information acquired by observation or experimentation. Scientists record and analyze this data
Answer: chemist
Explanation:
Write the chemical symbols for three different atomic anions that all have 34 protons.
Answer:
Explanation:
First of all it should be noted that number of protons is called atomic number in chemistry. The atom that has the atomic number of 34 in the periodic table is Selenium (Se). Anions are negatively charged atoms; the negative charge means the atoms have lost electron(s) while still having the same number of protons.
From the above, we can deduce that the only atom that can have 34 protons is Se and for it to become negatively charged (anion), it must lose electron(s).
The different chemical symbols thereof will be Se⁻,Se²⁻, Se³⁻ if it loses one, two or three electrons respectively while still having the atomic number of 34
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What is the volume of a sample that has a mass of 20 g and a density of 4 g/mL?
Answer:
The volume of a sample is 5 ml.
How much would it cost to drive from San Jose to Las Vegas (847 miles) is gasoline cost
$3.20 per gallon and your car gets 28 miles per gallon?
Answer:
$96.8
Explanation:
divide 847 by 28 because each gallon gets the car 28 miles and there's 847 miles in total and you get 30.25 and you multiple that by the cost so it be 30.25×3.20=$96.8
Calculate the pH of a buffer solution prepared by mixing 200 mL of 0.10 M NaF and 100 mL of 0.050 M HF.
Answer:
[tex]pH=3.74[/tex]
Explanation:
Hello,
In this case, by using the Henderson-Hasselbach equation one could compute the pH considering that the pKa of hydrofluoric acid, HF, is 3.14:
[tex]pH=pKa+log(\frac{[base]}{[acid]} )[/tex]
Whereas the concentration of the base and acid are computed by considering the mixing process with a total volume of 300 mL (0.3 L):
[tex]n_{HF}=0.1L*0.05mol/L=0.005molHF\\\\n_{NaF}=0.2L*0.1mol/L=0.02molNaF[/tex]
[tex][HF]=\frac{0.005molHF}{0.3L}=0.017M[/tex]
[tex][NaF]=\frac{0.02molHF}{0.3L}=0.067M[/tex]
Therefore, the pH turns out:
[tex]pH=3.14+log(\frac{0.067M}{0.017M} )\\\\pH=3.74[/tex]
Regards.
In which of the following sets do all species have the same number of electrons?
A) F-,Ne, Mg2+
B) Ge, Se2-, Br-
C) K+,Rb+, Cs+
D) Br, Br-, Br+
f-orbital can accommodate maximum of... electron?
Explanation:
S= 2
P=6
D=10
F= 14
F orbital holds a maximum of 14 electrons
Answer:
14.
Explanation:
The f level consists of 7 orbitals and each can accommodate up to 2 electrons.
Suppose a scientist is working to develop a new waterproof, breathable fabric for hiking boots. This is an example of ______.
Help me plz
Answer:
Product developmentExplanation:
Product development includes a product's entire journey, from Identifying a market need to conceptualizing and designing the product.
Creating a new software, designing a new tool or machine, designing and bringing new smartphones or gaming consoles to the market, designing and producing a new type of shoe, all are examples of product development.
There are five phases of product development : idea generation, screening, concept development, product development and commercialization.
The moon appears larger than most of the planets in our solar system because ______?
its closer than us than the planets
:)
if an atom has 17 protons and 18 neutrons, what is the charge of the atom's nucleus?
dont need time cause time waiting on nobody
A gold nugget has a mass of 24.41 G , What is the mass in ounces ? (1 oz =28.3459)
Answer:
24.41 grams=0.861 ounces
Explanation:
Since, 1 ounce = 28.3495 grams
We need to find the mass of 24.41 grams of a gold nugget.
We can say that, [tex]1\ \text{gram}=\dfrac{1}{28.3459}\ \text{ounces }[/tex] ....(1)
To find mass of 24.41 grams of a gold nugget multiply RHS of the equation 1 by 24.41.
So,
[tex]24.411\ \text{gram}=\dfrac{1}{28.3459}\times 24.41\ \text{ounces }\\\\=0.861\ \text{ounce}[/tex]
Therefore, 24.41 grams is equal to 0.861 ounces.
What must you know to solve Keller’s third law the law of periods