Answer:A
Explanation: yes
Explanation: its c
becuase iknow
Which of the following is an element?
A.
magnesium chloride salt (MgCl)
B.
hydrochloric acid (HCl)
C.
carbon monoxide gas (CO)
D.
zinc metal (Zn)
Answer:
zinc metal (ZN) is an element
A change in the external or internal environment of an organism is known as
Answer:
A stimulus is a change in the internal or external environment. A receptor detects a stimulus.What is a by-product of a nuclear power plant?
Answer:
There are four categories of byproduct material: Radioactive material that results from the fissioning, or splitting apart, of enriched uranium or plutonium in nuclear reactors. Examples include cobalt-60, cesium-137 and iridium-192. Tailings or waste produced by processing uranium or thorium from ore.
Please help!!! Need answer fast.
Determine the mass of 7.06 × 10^23 atoms Cl.
Answer in units of g.
^ tap to see the full pic
Explanation:
you make use of the formulas
amount(mol) = number of particles ÷ 6.02 × 10^23
and
mass(g) = amount(mol) × molar mass
How many magnesium bromide formula units are there in 1.5 moles of MgBr2
Answer: The answer is 0.0054314469917931, I'm pretty sure.
The empirical formula of the compound is called the formula unit in chemistry. In 1.5 moles of magnesium bromide, [tex]9.03\times 10^{23}[/tex] formula units are present.
What are moles and formula units?Moles are the measuring units of the molecules, atoms, and other particles of the chemistry. Formula units of any substance can be estimated as the product of the moles and the Avogadros number.
The number of the moles present of the magnesium bromide is 1.5 mol and the value Avogadro number is [tex]6.02 \times 10^{23}.[/tex]
If 1 mole of the substance contains [tex]6.02 \times 10^{23}[/tex] formula units, then, formula units in 1.5 moles are:
[tex]\begin{aligned} & = 1.5 \times 6.02 \times 10 ^{23}\\\\& = 9.03 \times 10^{23} \end{aligned}[/tex]
Therefore, [tex]9.03 \times 10^{23}[/tex] formula units are present in 1.5 moles of magnesium bromide.
Learn more about formula units here:
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4 What is the maximum number of students among whom 125 oranges, 150 citrus
and 225 guavaes can be equally divided? What is share of each fruit for a student?
Find it.
Answer:
25
Explanation:
fing the highest common factor
pime factorisation:
125=5×5×5
150=2×3×5×5
225=3×3×5×5
find the common numbers in all prime numbers
》5×5=25
During photosynthesis, plants take in carbon dioxide, water, and energy from the sun and produce carbohydrates and oxygen. Which of the following statements best explains how plants follow the law of conservation of mass during photosynthesis?
The amount of each element in the reactants equals the amount of each element in the products.
The number of carbon dioxide molecules taken in exactly equals the number of carbohydrate molecules produced.
The plant uses the carbon dioxide gas, liquid water, and energy to produce a solid carbohydrate.
The plants mass does not increase or decrease as a result of photosynthesis.
Answer:
The amount of each element in the reactants equals the amount of each element in the products.
For the well balanced equation of photosynthesis
When polymers are built, the process is called a dehydration reaction. Why is the word “dehydration” used?
Answer:
i really dont know
Explanation:
An oxide of trivalent metal contains 32% of oxygen. Calculate the atomic mass of the metal.
The atomic mass of the metal.(M) = 51 g/mol
Further explanationGiven
32% of oxygen
Required
the atomic mass of the metal.
Solution
An oxide of trivalent metal : M₂O₃(Ar O = 16 g/mol)
The molar mass of metal oxide = 2M+16.3=2M+48
32% of oxygen, then :
32% x 2M+48 = 48
0.32(2M+48)=48
0.64M+15.36=48
0.64M=32.64
M=51
Can you pls help me. TY!
3S8 + 8 OH- + 8 S3 + 4 HOOH
In an experiment, a student studies the kinetics of the reaction represented above and
obtains the data shown in the following table.
Initial [S
Initial
Initial (OH)
Experiment
Reaction Rate
(M)
(M)
(M/s)
Trial 1
0.100
0.0100
0.699
Trial 2
0.300
0.0100
2.10
Trial 3
0.300
?
4.19
Use the data in the table and determine the order of the reaction with respect to Sg.
O first order
O zero order
O second order
O third order
Answer:
Second order
Explanation:
We could obtain the order of reaction by looking at the table very closely.
Now notice that in experiment 1 and 2, the concentration of [OH^-] was held constant while the concentration of [S8] was varied. So we have;
a situation in which the rate of reaction was tripled;
0.3/0.1 = 2.10/0.699
3^1 = 3^1
Therefore the order of reaction with respect to [S8] is 1.
For [OH^-], we have to look at experiment 2 and 3 where the concentration of [S8] was held constant;
x/0.01 = 4.19/2.10
x/0.01 = 2
x = 2 * 0.01
x = 0.02
So we have;
0.02/0.01 = 2^1
2^1 = 2^1
The order of reaction with respect to [OH^-] = 1
So we have the overall rate law as;
Rate = k[S8]^1 [OH^-] ^1
Overall order of reaction = 1 + 1 = 2
Therefore the reaction is second order.
which one of the following is not a pure substance? A. Diamond B. water C. Oxygen D. Milk
Answer:
Milk
Explanation:
Main compounds of milk are lactose and casein. And it is also called a colloidal mixture (i.e. in which one substance of microscopically dispersed insoluble or soluble particles is suspended throughout another substance). Therefore milk is regarded as a mixture not as a pure substance. So this is the required answer.
The balanced chemical equation below shows the combustion reaction of butane (C₄H₁₀). What is the mole ratio of butane (C₄H₁₀) to carbon dioxide (CO₂)? *
[tex]2C_{4}H_{10} + 13O_{2} --\ \textgreater \ 8CO_{2} + 10H_{2}O[/tex]
2:8
13:8
13:10
1:5
P.S. This is a science question not a chemistry.
When the tilt of the Earth causes the sun’s energy/light to be spread out over a larger area, temperatures are ____________ causing ____________ to occur.
A. the same, Spring
B. warmer, Summer
C. cooler, Winter
Answer:
B) When the tilt of the Earth causes the sun’s energy/light to be spread out over a larger area, temperatures are ______warmer______ causing _____Summer_______ to occur.
1. Compare atoms, molecules, compounds.
Answer: Molecules contain two or more atoms and are held together by covalent bonds, whereas compounds are held together by ionic bonds. Two or more elements bonded together through ionic attraction. Compounds contain two or more atoms and are held together by ionic bonds, whereas molecules are held together by covalent bonds.
Explanation:
Which of these statements is true?
A Rocks can only change on the earth's surface
B Rocks can change from one type to another
C Rocks can only change inside the earth
D Rocks never change
Answer:
B
Explanation:
The reaction below will occur in a gaseous system at STP:
6 NO (g) + 4 NH3 (g) —> 5 N2 (g) + 6 H20 (g)
What volume of nitrogen gas will be produced from 15.0 L of nitrogen monoxide gas?
12.5 L
18.0L
15.0 L
22.5 L
Answer:
V = 12.5 L
Explanation:
Given data:
Volume of NO = 15.0 L
Temperature and pressure = standard
Volume of nitrogen gas produced = ?
Solution:
Chemical equation:
6NO + 4NH₃ → 5N₂ + 6 H₂O
Number of moles of NO:
PV = nRT
n = PV/RT
n = 1 atm × 15.0 L / 0.0821 atm.L /mol.K × 273.15 K
n = 15.0 atm.L / 22.43 atm.L /mol
n = 0.67 mol
now we will compare the moles of No and nitrogen gas.
NO : N₂
6 : 5
0.67 : 5/6×0.67 = 0.56
Volume of nitrogen gas:
PV = nRT
1 atm × V = 0.56 mol × 0.0821 atm.L /mol.K × 273.15 K
V = 12.5 atm.L / 1 atm
V = 12.5 L
Which formula can be used to calculate the molar mass of water (H2O)?
Answer:
One mole of H2O is made up of 2 moles of Hydrogen atoms and 1 mode of Oxygen atom. Mass of two moles of Hydrogen atoms = 2x1 g/mol. Mass of one mole of water = 2 g/mol + 16 g/mol = 18/ mol.
Explanation:
I majored in Chemistry
What is one of the functions of the nucleus?
A.
to remove waste products from a cell
B.
to contain the genetic information of an organism
C.
to determine what materials can enter or leave a cell
D.
to provide structural support for a plant cell
Answer:
B.
to contain the genetic information of an organism
Explanation:
The nucleus controls and regulates the activities of the cell (e.g., growth and metabolism) and carries the genes, structures that contain the hereditary information. Nucleoli are small bodies often seen within the nucleus.
Balance The Equation SHOW WORK
H2 + O2 → H2O
Ca + O2 → CaO
Ca + HCl → CaCl2 + H2
Explanation:
done.....................
PLEASE HELP!!
Ecosystem services are benefits that healthy, diverse ecosystems provide to humans. List some ecosystem services provided by a healthy biodiversity on Earth and describe how our lives would be changed without these.
Answer:
Ecosystem services are indispensable to the wellbeing of all people, everywhere in the world. They include provisioning, regulating, and cultural services that directly affect people, and supporting services needed to maintain the other services.
Ecosystem provides water and air which are essential for survival on earth without the presence of these essential things life on earth could not exist.
What is an ecosystem?Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
Learn more about ecosystem,here:
https://brainly.com/question/19267717
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Based on the fossil records, what is true
concerning populations of organisms that lived on
Earth?
A. Most organisms are found in the earliest rock
layers.
B. Most organisms stayed the same over time.
C.
Most organisms that lived on Earth are
extinct.
Helpppppp
Answer:
C
Explanation:
The reason why is beacause most of the dino's and other spices that were here before humanity are exctinct. Some are still alive and have evovled into something greater such as a crocidile, and many other repitlians
Hope this helps!
Pls mark brainlest!
What does the "129" represent in the following notation? *
Te-129
All can change the Earth slowly and gradually except
A. erosion
B. weathering
C. melting rock
D. earthquake
Answer:
D. Earthquake
Explanation:
I think earthquake because the question is asking for SLOW changes and an earthquake is kind of a sudden change...so yeah.
Hope this helps :D
Select the correct location on the image.
The movement of which layer of Earth drives the motion of the plates on Earth's crust?
Answer:
Upper mantle
Explanation:
If i'm wrong I'm SO sorry. Please forgive me.
Friendly guy that likes to help.
(no italics this time kek)
Which of the following is true about the behavior of an organism?
A.
The behavior of an organism is influenced only by the traits it inherits from its parents.
B.
The behavior of an organism is influenced only by the environment in which it lives.
C.
The behavior of an organism is not influenced by either its heredity or its environment.
D.
The behavior of an organism is influenced by both its heredity and its environment.
Answer:
C. The behavior of an organism is not influenced by either its heredity or its environment.
35.0 grams of nitrogen gas reacts with 60.0 grams of hydrogen gas: N2 + 3H2--> 2NH3
a) Identify the limiting reagent:
b) Calculate the grams of ammonia formed:
c) Calculate the grams of excess reactant formed:
Explanation:
Moles of N2 = 35.0g / (28g/mol) = 1.25mol
Moles of H2 = 60.0g / (2g/mol) = 30.0mol
Since 1.25mol * 3 < 30.0mol, nitrogen is limiting.
Moles of NH3 = 1.25mol * 2 = 2.50mol.
Mass of NH3 = 2.50mol * (17g/mol) = 42.5g.
30.0mol - 1.25mol * 3 = 26.25mol.
Excess mass of H2
= 26.25mol * (2g/mol) = 52.5g.
Another name for the water cycle is the
Answer: Hydrologic Cycle!
Do the molecules of a liquid have (more, less, or the same) freedom of movement as the molecules of a gas? *
Is calcium more reactive than lead?
Answer:
Yes Calcium is more reactive than Lead.
Explanation:
Answer:
Yeah.
Calcium is in group II and lead is in group IV.
Since reactivity decreases from left to right of the periodic table, calcium reacts severely than lead