Answer:
150000 degrees
Explanation:
please help me.......
Answer:
D as in :D lol
Sciences Grad Bosch Law of Conservation of Mass - Assess it
contents
Target: 10/2001
Science and Enging
Achemical reaction takes place in a closed system. The mass of the reactants before the reaction was
55 watte mass of the products of the reaction be according to the law of conservation
Properties of Matter
Answer:
55
Explanation:
According to the law of conservation properties of Matter in a closed system the mass of reactants is equal to the mass of products. Because there is no lose of matter or energy in closed system
1. A sodium ion has 11 protons and 10 electrons. What is its charge?
+1
If sodium loses an electron, it now has 11 protons, 11 neutrons, and only 10 electrons, leaving it with an overall charge of +1. It is now referred to as a sodium ion.
define atom and give an example
Answer:
Many atoms consist of a positively charged nucleus composed of protons and neutrons surrounded by a negatively charged cloud of electrons. At its most basic level, an atom is any particle of matter that contains at least one proton. ... Here are some examples of atoms: Neon (Ne) Hydrogen (H)
Explanation:
Several dams on the Colorado River in Texas produce electricity through hydropower. What is
an advantage of this type of energy production?
A: land is flooded when dams are built
B:Dams improve biodiversity by creating lakes out of rivers
C:hydropower provides renewable energy for human use
D:electricity can only be generated during daylight hours
Answer:
The answer is Hydropower provides...
Hydropower provides renewable energy for human use is the advantage of the production of electricity through hydropower. Therefore, option (C) is correct.
What are the advantages of hydropower?Hydropower is a renewable source of energy that is used to generate energy via hydropower relies on the water cycle. Hydroelectric power can be defined as a domestic source of energy, allowing it to produce its own energy without depending on international fuel sources.
The hydropower sector creates reservoirs that provide recreational opportunities such as swimming, fishing, and boating. Hydroelectric power is flexible and has facilities that can quickly go from zero power to maximum output.
They provide necessary backup power during major electricity outages or disruptions because hydropower plants can produce power to the grid immediately.
Hydropower is affordable and provides low-cost electricity and durability over time compared to other sources of energy. Hydropower benefits beyond electricity production by providing irrigation support, flood control, and clean drinking water.
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Which of the following is a physical change ?
• burning a piece of paper
• lighting a match
• chopping a piece of wood
• a rusting nail
Chopping a piece of wood
Physical changes are changes affecting the form of a chemical substance but not it's chemical composition.
Answer:
rusting nail: Rusting would only be a physical change if iron molecules remained pure iron throughout the process. Yeah your correct a physical change is anything seen or felt like changing the temperature of water a chemical change can also be seen also like if a iron nail rusts the nails iron atoms were chemically changed by oxygen.
lighting a match: Breaking a match in two pieces is an example of a physical change. Lighting a match and letting is burn is an example of a chemical change. Chemical reactions cause chemical changes. In a chemical reaction two or more substances, called the reactants, form different substances called products.
burning a piece of paper: Burning of paper is not a physical change. It is chemical change as ash is formed in the process which is new compound and oxides of carbon are also released during the process. By the definition of chemical change, we come to know that during chemical change a new substance must form. These changes are irreversible in nature.
chopping a piece of wood: The chopping of wood is a physical change because as stated previously, any physical change can include cutting, bending, sharpening, etc. When a piece of wood is being cut, it undergoes one of these processes. The chopping of wood doesn't alter the chemical structure of the actual wood.
So Its chopping piece of wood!
Hope this helps!!Calculate the density; D= mass/ volume
1)
A student measures the mass of an
8 cm3 block of brown sugar to be 12.9 g.
What is the density of the brown sugar?
2) A chef fills a 50 mL container with 43.5 g of
cooking oil. What is the density of the oil?
Answer:
density of sugar = 1.6 g/cm³
density of oil = 0.87 g/mL
Explanation:
1)
Given data:
Mass of object = 12.9 g
Volume of object = 8 cm³
Density of brown sugar = ?
Solution:
Formula:
d = m/v
d = density of object
m = mass of object
v = volume of object
Now we will put the values in formula.
d = 12.9 g/ 8 cm³
d = 1.6 g/cm³
2)
Given data:
Mass of oil = 43.5 g
Volume of container = 50 mL
Density of oil = ?
Solution:
Formula:
d = m/v
d = density of oil
m = mass of oil
v = volume of oil
Now we will put the values in formula.
d = 43.5 g/ 50 mL
d = 0.87 g/mL
As part of a chemistry experiment, Sam notes that the temperature at which liquid mercury
freezes into a solid is -102 Fahrenheit (F). The beaker of liquid mercury provided to him Is
at a room temperature of 68". By how many degrees will Sam have to cool the liquid
mercury for it to freeze into a solid?
-102"F
-34°F
102°F
170°F
o
Answer:
-34¨F
Explanation:
Which statement about the layers would they identify as correct?
oxidation is a example of ?the answer choices are are here
A.a financial property,B.a chemical property,C.cool science stuff,D.a physical property
Answer:
B. a chemical property
Explanation:
Oxidation requires a chemical reaction to occur, therefore it is a chemical property.
Determine how you would prepare 220 mL of a 0.500 M potassium hydroxide solution starting with: a) solid potassium hydroxide b) a 1.25 M potassium hydroxide solution
Answer:
a) 6.17 g of solid KOH
b) 88.0 mL of a 1.25 M potassium hydroxide solution
Explanation:
a) We have to determine the mass of solid potassium hydroxide that has to be weighed to prepare 220 mL of a 0.500 M potassium hydroxide solution. We will also require the molar mass of potassium hydroxide, KOH, 56.11 g/mol.
0.220 L × (0.500 mol/L) × (56.11 g/mol) = 6.17 g
b) We will use the dilution rule to determine the volume of the 1.25 M potassium hydroxide solution to be measured.
C₁ × V₁ = C₂ × V₂
V₁ = C₂ × V₂ / C₁
V₁ = 0.500 M × 220 mL / 1.25 M = 88.0 mL
How should this combustion reaction be balanced?
C5H8+O2 + CO2 + H20
The balanced combustion reaction is C₅H₈ + 7O₂ → 5CO₂ + 4H₂O
Hence, Option (B) is correct answer.
What is Combustion reaction ?Combustion reaction is a type of chemical reaction between the hydrocarbon and oxygen.
CₓHₙ + O₂ → H₂O + CO₂
What is Balanced Chemical Equation ?The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.
The given reaction is C₅H₈ + O₂ → CO₂ + H₂O
Now we have to balanced this reaction
Reactant side Product side
C = 5 C = 1
H = 8 H = 2
O = 2 O = 3
In the reactant side there are 5 C atoms and in product side there are 1 C atom. Multiply by 5 in the product side.
C₅H₈ + O₂ → 5CO₂ + H₂O
Reactant side Product side
C = 5 C = 5
H = 8 H = 2
O = 2 O = 11
In the reactant side there are 8 H atoms and in product side there are 2 H atoms. Multiply by 4 in the product side.
C₅H₈ + O₂ → 5CO₂ + 4H₂O
Reactant side Product side
C = 5 C = 5
H = 8 H = 8
O = 2 O = 14
In the reactant side there are 2 O atoms and in product side there are 14 O atoms. Multiply by 7 in the product side.
C₅H₈ + 7O₂ → 5CO₂ + 4H₂O
Reactant side Product side
C = 5 C = 5
H = 8 H = 8
O = 14 O = 14
Now the equation is balanced all the atoms of reactant side and product side are same.
Thus from above conclusion we can say that The balanced combustion reaction is C₅H₈ + 7O₂ → 5CO₂ + 4H₂O
Hence, Option (B) is correct answer.
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which way do heat flow
Answer:
Right side of the heart
Blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. As the atrium contracts, blood flows from your right atrium into your right ventricle through the open tricuspid valve.
Explanation:
Which observable property of a star is indicative of the star's surface temperature?
O color
O shape
O speed
O brightness
A reef that surrounds a volcanic island is an
Answer:
atoll
Explanation: this is correct, pls give me brainliest
In the apple activity you completed which of the following is an example of a constant
Answer: the type of apple because it is an example of a constant
Explanation:
if a baseball player hits a baseball from 4 feet off the ground with an initial velocity of 64 feet per second, how long will it take the baseball to hit the ground? use the equation h= -16t^2+4t + 4 round your answer to the nearest tenth hundredth
Answer:
4.06
Explanation:
if a man could fall through a hole that passes through the center of Earth, gravity would cause him to:
A.Gain speed until he reached the other end of the tunnel.
B. Stop falling at the center of Earth.
C. Gain speed until he passed the center and then lose speed until he reached the other side.
HELP PLEASEE
Name three elements present in the ingredients of the cereal drink which are not listed in the nutrition facts
Answer:
Let's start with the fact that cereals , are made of grains and are mostly carbohydrates. therefore they contain carbon oxygen and hydrogen. They also contain proteins so have nitrogen. Plants have the minerals that are in the soil where they grow, so the list you have is correct. They also generally have added vitamins ad minerals. The vitamins contain C, H, O N, and a few others such as sulfur, The added minerals might contain:copper, iron, zinc, cobalt, selenium, silicon and molybdenum .
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The three elements present in the ingredients of the cereal drink which are not listed in the nutrition facts are Iron, Calcium, and Zinc
Cereals are monocotyledonous grass crops cultivated annually for the purpose of consumption. They are rich in fiber and energy. Examples of them include;
maize, barley, wheat, oat, rye, etc.Cereal drinks are processed drinks extracted from cereal crops through fermentation. They are rich in nutrients as they contain important sources of carbohydrates, dietary protein, and vitamins.
The ingredients present in a cereal drink are composed of essential elements such as:
copper, cobalt, iron, zinc, molybdenum, iodine, chromium, and selenium.Some of which are not listed in the nutrition facts are Iron, Calcium, and Zinc.
Therefore, we can conclude that the elements present in the ingredients of the cereal drink which are not listed in the nutrition facts can be Iron, Calcium, and Zinc.
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Ben makes five paper helicopters with different wing lengths. He drops them the same way from a height of two meters for five trials each. He records the amount of time it takes for each helicopter to fall to the ground. What is the independent variable?
Answer:
Wing length
Explanation:
According to the given excerpt, independent variable is 'wing length' and dependent variable is 'amount of time it takes for helicopter to hit the floor'.
Independent variable refers to the variable that do not undergo any change or shift in the course of the experiment of research. The other variables are measured using the constant independent variable. The value obtained from the independent variable is independent. On the other and, the dependent variable witnesses change with respect to the independent variable.
Please help me with this I’ve been on this question for 10 minutes now...
Answer:
A
Explanation:
we know that pangea was when all the continents were connected and the tectonic plates moved, causing pangea to split into multiple pieces. so north america was formed by moving tectonic plates.
i hope this helps :))
Which of the following is the least likely to remain homogeneous?
. O A. All of these
O B. A supersaturated solution
O C. An unsaturated solution
O D. A saturated solution
Answer:
all
of them
Explanation:
(True or False) Only an odd number of orbitals is possible for any electron sublevel?
Answer:
The statement is true
I found this doing research.
Apparantly, each sub level is made up of one or more orbitals and the orbitals in each sub level are always odd number. Each orbital can only have two electrons and those two electrons will have opposite spin.
Explanation:
Answer:
True
Explanation:
How many cesium atoms are in 21.9 grams?
how can you find a tutor??
Depending on what you are doing, virtual, or in school, you can contact your school and you ask them, or you can have your teacher, based on the subject, tutor you.
<3
Answer:
You can find tutors in many ways maybe you can find some apps or
you can also ask any family members who live close and ask them there is many ways :)
It sometimes depends on the subject
Can I have brainliest pleasee
Line M passes through the points (-5, 9) and (-1,9).
12
10-
8
6
2
-12-10-8-6-4-22
2
6 8 10 12 X
6
-10
-12-
Which is true of line M?
Answer:
line m is vertical line with an undefined slopel line correct answer is 6 8 10 12 x
What happens to a solute?
A. It gets dissolved in something else.
B. It settles out of the solution.
C. It forms a solid in the solution.
O D. Something gets dissolved in it.
A solute gets dissolved in something else. (solvent)
What is a solute?A solute is a substance which dissolves in something else, like a solution. As a result, a homogeneous mixture is formed. A solute can be a gas, solid or a liquid.
What is a solvent?A solvent is a substance in which a solute happens to dissolve in order to produce a homogenous mixture. Solvents can also exist as solids, liquids as well as gases.
For example, NaCl is a solute which dissolves in water, which is a solvent. The equation is as follows
NaCl (aq) + H2O (l) → NaOH (aq) + HCl (aq)
Hence, option A is the correct option.
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What is the role for dna in determining an organisms traits?
Answer:
DNA contains the genes or the genetic material of an organism. Its role is to store information that are essential in controlling the genetic makeup or producing a certain characteristic of an organism.
The orbital diagram shows the valence electrons of sulfur, which has 16 electrons. If the electrons were added to the atom one at a time, which would be the last electron to occupy an orbital?
Answer:
3px
Explanation:
The electronic configuration of sulphur is given as;
1s2 2s2 2p6 3s2 3px2 3py1 3pz1.
Recall that in accordance with Hund's rule, electrons occur singly first before pairing takes place during the filling of degenerate orbitals.
The last sub-level into which electrons are filled in sulphur is the 3p sub-level having three degenerate orbitals, 3px, 3py and 3pz.
According to Hund's rule, these levels are first singly filled before pairing begins. Hence the last electron in sulphur goes into the 3px orbital.
Answer:
3px
Explanation:
The electronic configuration of sulphur is given as;
1s2 2s2 2p6 3s2 3px2 3py1 3pz1.
Recall that in accordance with Hund's rule, electrons occur singly first before pairing takes place during the filling of degenerate orbitals.
The last sub-level into which electrons are filled in sulphur is the 3p sub-level having three degenerate orbitals, 3px, 3py and 3pz.
According to Hund's rule, these levels are first singly filled before pairing begins. Hence the last electron in sulphur goes into the 3px orbital.
Explanation:
One of the uses of methanol (CH3OH) in dilute form is as a windshield washer antifreeze. In pure form, methanol has a molar concentration of 24.7M. How many moles are contained in 500 mL of solution?
Mole itself is the number of particles contained in a substance
1 mole = 6.02.10²³ particles
Mole : the ratio of the amount of substance mass and its molar mass
[tex]\large{\boxed{\boxed{\bold{mole=\frac{mass}{molar\:mass}}}}[/tex]
Molarity is a way to express the concentration of the solution
Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution
[tex]\large{\boxed {\bold {M ~ = ~ \frac {n} {V}}}[/tex]
Molar concentration of methanol=24.7 M
Volume of solution = 500 ml = 0.5 L
[tex]\tt mol=M\times V\\\\mol=24.7\times 0.5\\\\mol=12.35[/tex]