Answer:
4
Explanation:
Oxygen, Sulfur, Selenium
Air can be considered a ____________ of gaseous elements and compounds.
A) heterogeneous mixture
B) homogeneous mixture
C) colliodal solution
D) suspension
Spherical shaped bacteria are identified using the term
A. spirilla
B. cocci
15. The element lithium (Li) has an atomic mass of 3 and a mass number of 7.
Explain how you know that the diagram above represents a lithium atom.
What you already know:
C on this diagram is a proton and B points to the electron. A note the nucleus that contains the protons and the center of orbit to the electrons. D notes the electron cloud, radius, or the bounds to which the electron obitals exist.
Answer:
If you count the number of protons this atom has it adds up to 3, which, therefore comfirms that this molecule is Li. The number of protons is specific to the atom. The question states that this element has a mass number of 7, this is because the mass number is the sum of both protons and electrons.
can somebody please help me with these I literally have no idea what it’s asking
Answer:
I believe it's copper
Explanation:
The reasoning being that Copper = 9.0 g/cm and the mystery item has 5.0 cm so 9*5 = 45 something like that
What color would litmus paper turn in a solution of baking soda? Explain your answer in terms of pH.
Which question would be scientifically reasonable for a student to ask about the layers of the Earth?
A. Why does the temperature decrease as you move from the crust to the core?
B. Why does density increase as you move from the crust to the core?
C. Why does density decrease as you move from the crust to the core?
D. Why is the inner core liquid iron and the outer core solid iron?
Answer:
The answer is C
Explanation:
2Al + 6HCl → 2AlCl3 + 3H2
If the chemical reaction produces 129 grams of AlCl3, how many grams of H2 are also produced?
Answer: The reaction produces 2.93 g H₂.
M_r: 133.34 2.016
2Al + 6HCl → 2AlCl₃ + 3H₂
Moles of AlCl₃ = 129 g AlCl₃ × (1 mol AlCl₃/133.34 g AlCl₃) = 0.9675 mol AlCl₃
Moles of H₂ = 0.9675 mol AlCl₃ × (3 mol H₂/2 mol AlCl₃) = 1.451 mol H₂
Mass of H₂ = 1.451 mol H₂ × (2.016 g H₂/1 mol H₂) = 2.93 g H₂
Explanation:
8. Which of the following are reasons why Index fossils are chosen for determining ages of rocks? Select all that apply .
A Found commonly in rocks
B. Distributed over a very wide range
C. Are always dinosaurs
D. Limited life existence in geologic time.
Answer:
B. Distributed over a very wide range
D. Limited life existence in geologic time.
Explanation:
Index fossils are very unique fossils that helps in determining the relative ages of rocks and biostratigraphic correlation. They are usually called guide fossils.
Fossils are the preserved remains of dead organisms found in rocks. Index fossils are a special class of fossils with the following properties; They are widely distributed. They have a short stratigraphic range. They show rapid evolution trendsAnswer:
d and b
Explanation:
How many joules of energy are made by the loss of 100kg of mass using the formula E=mc2? please help!!!
Answer:
E = 3 × 10¹⁰ J
Explanation:
Mass, m = 100 kg
We need to find energy made by the loss of 100 kg of mass. The formula between the mass and energy is given by :
E = mc²
Where c is speed of light
Putting all the values, we get :
E = 100 kg × (3×10⁸ m/s)²
= 3 × 10¹⁰ J
So, the required energy is 3 × 10¹⁰ J.
Which of the following compounds is most ionic?
a. Mgo
b. LiBr
C. HCI
d. CaCl2
Answer: CaCl2
Explanation:
Which of the following is a change in the earths surface caused by glaciers?
Are there any answer choices that go along with the question??
How many moles of hydrogen atoms are
present in 15 moles of C2H6O?
Answer in units of mol.
What do insects use to get oxygen? A. lungs B. spiracles C. gills D. stomata
Answer:
B spiracles
Explanation:
These are the tubes connected to the openings in their sides
Insects use tiny openings in their body wall called spiracles to get oxygen. They are also called tracheal tubes. Hence, option B is correct.
What is insect spiracles ?An insect's inside functions almost like a sponge. Because a sponge has tiny holes that allow water to enter, it becomes moist. Spiracles are similar to this. They allowed oxygen to enter the bug's body. They then release carbon dioxide.
Insects can open and close their spiracles . This is accomplished through certain muscles . To drive oxygen through their bodies, insects can also contract their muscles. The oxygen inside them is spread out by doing this.
Stomata is the reparatory organ in plants and gills are the organ in aquatic livings for respiration. In mammals lungs are the respiratory organ. Therefore, option B is correct.
Find more on spiracles:
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46.0 g of barium nitrate is dissolved in 360 g of water. What is the percent concentration of the barium nitrate solute in the solution?
Pls help with answer I don’t get it
The percent concentration of the Barium nitrate : 11.33%
Further explanationThe concentration of a substance can be expressed in several quantities such as moles, percent (%) weight/volume,), molarity, molality, parts per million (ppm) or mole fraction. The concentration shows the amount of solute in a unit of the amount of solvent.
[tex]\tt \%mass=\dfrac{mass~solute}{mass~solution}\times 100\%[/tex]
mass solute=mass Barium nitrate(Ba(NO₃)₂)=46 g
mass solvent=mass water=360 g
mass solution=mass solute+mass solvent=46+360=406 g
[tex]\tt \%mass=\dfrac{46}{406}\times 100\%\\\\\%mass=\boxed{\bold{11.33\%}}[/tex]
How many molecules make up 8.41 moles of Ca2(SO3)?
Answer: ??? molecules Ca2(SO3) (no rounding; make sure to include scientific notation when necessary)
Answer:
5.06282 × 10²⁴ moleculesExplanation:
The number of molecules of Ca2(SO3) can be found by using the formula
N = n × Lwhere n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
N = 8.41 × 6.02 × 10²³
We have the final answer as
5.06282 × 10²⁴ moleculesHope this helps you
Which of the following theories did these discoveries lead to?
Answer:
Explanation:
the discovery of microscopes
Answer: A . The cell theory
Explanation:
Scientists believe that there are three genes that contribute to skin color in humans.
Which of these best describes the inheritance pattern of skin color?
multiple allele in which offspring receive three alleles from each parent
multiple allele in which offspring receive three alleles from only one parent
polygenic in which offspring receive three alleles from each parent
polygenic in which offspring receive three alleles from only one parent
Answer:B
Explanation:
I took the test
Answer:
b
Explanation:
bjdcbndjcf jvhbf its just b
Describe a composite volcano. Use the following terms in your response: silica-rich, eruption, and crater.
Answer: A composite volcano is the most common type of volcano. They have non-explosion and explosion eruptions. There crater is big, or small. They are also called Stratovolcanoes.
Explanation:
what is the happens in electrolysis if the electrolyte solidifies?
Answer: For example, if electricity is passed through molten lead bromide, the lead bromide is broken down to form lead and bromine. This is what happens during electrolysis: Positively charged ions move to the negative electrode during electrolysis. ... Negatively charged ions move to the positive electrode during electrolysis.
Explanation:
hope this helps you find what your looking for
When is International coffee day?
The nuclear symbol for uranium-235 should be written as
O U-235.
225
92 U
233
143U
OU
Answer:
²³⁵₉₂U
Explanation:
The right symbol for the nuclei is ²³⁵₉₂U;
For this chemical element, the atom is represented by the symbol U;
To the superscript before the symbol is the mass number
The subscript before the symbol is the atomic number
Mass number is the number of protons and neutrons
Atomic number is the number of protons.
Which pair of elements forms the most ionic bond? Refer to the periodic table.
A) K and CI
B) Be and CI
C) Li and CI
D) O and CI
Answer:
KCl
Explanation:
Look at the electronegativity differences between the pairs of elements:
KCl: 3.16 - 0.82 = 2.34
BeCl: 3.16 - 1.57 = 1.59
LiCl: 3.16 - 0.98 = 2.18
ClO: 3.44 - 3.16 = 0.28
KCl has the highest electronegativity difference; thus it is the most ionic bond of the 4.
Answer:
b barium and chlorine
Explanation:
chemical bond formed between 2 oppositely charged ions
How are the atoms in a liquid different from the atoms in a solid?
O liquid atoms are more tightly packed and move slower
O liquid atoms are less tightly packed and move faster
liquid atoms are more tightly packed and move faster
liquid atoms are less tightly packed and move slower
Answer:
liquid atoms are less tightly packed and move faster
Amir wants to change this model to represent a different isotope of oxygen How could he make this change?
А
add one green candy
B
rearrange the blue candies
C.
add one red candy
D
take away two blue candies
Answer:
Option A. Add one green candy
Explanation:
From the question given above, the following data were obtained:
Red color => Proton
Green => Neutron
Blue => Electron
Isotopy is a phenomenon where by two or more elements have the same atomic number by different mass number due to the difference in the neutron number. The atoms involved are called isotopes.
From the above definition, isotope exist when the neutron number of the atoms are different with each having same atomic number (i.e proton number).
Thus, considering the question and the options given above, the only way to make a different isotope of oxygen is to add a green candy (i.e neutron).
Can someone write 3 complex sentences i really need some help thank you!!!:)
DUE TODAYYYY AT 10!!!!!1
Answer:
1.Because my coffee was too cold, I heated it in the microwave.
2. Although he was wealthy, he was still unhappy.
3. She returned the computer after she noticed it was damaged.
Explanation:
..
6.10 g of a solid chemical reacts with a 10 g of a liquid chemical, the
reaction bubbles and changes the color of the liquid. The colored liquid
weighs 13
g. what can be concluded? *
The gas produced from the bubbles weighed 5 g
The gas produced weighed 7 g
The gas produced weighed 13 9
The bubbles were evidence of 7 g of matter being destroyed
Other
Answer: True
Explanation:
Q. 10g of white powder reacts with 10g of clear liquid. The reaction bubbles and changes color producing a black liquid that has a mass of 13g. What can be ...
When 10 g of a solid chemical reacts with 10 g of a liquid chemical, the reaction bubbles and the liquid changes color. The coloured liquid has a weight of 13 g. This can be said. The produced gas weighed 7 g.
What is chemical reacts?A chemical reaction is a procedure that causes one group of chemical components to change chemically into another. According to Wikipedia, a chemical reaction is a process in which one or more compounds, known as reactants, change into one or more other substances, known as products. Chemical elements or chemical compounds make up substances.When two or more molecules combine to create a new product, the process is known as a chemical reaction (s). Products, as opposed to reactants, are the compounds that result from an interaction between two other substancesChemical reactions are the process by which an existing chemical substance is changed into a different chemical substance by forming and breaking bonds between various atoms.To learn more about chemical reacts refer to:
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In which direction does water move across membranes, up or down the concentration gradient?
Answer:
If a membrane is permeable to water, though not to a solute, water will equalize its own concentration by diffusing to the side of lower water concentration
Explanation:
PLEASE HELP!!!!!!!!!!
How does the words used in a text help the theme, setting, and plot?
HELP ME PLEASE ASAP. I'LL MARK YOU BRAINLIEST
ITS NUMBER 23.
Answer:
The answer is A
Explanation:
define mass number ??
the total number of protons and neutrons in a nucleus
