Prototypes are used to
a. communicate a solution.
b. test the operation of a product.
c. identify a need.
d research a problem.
Answer:
Test the operation of the product
Explanation:
true or false there is a risk of explosion in factories handling powders such as custard powder
Answer:
True? I think so At least
Explanation:
A roller coaster with a mass of 20kg sits at the top of a 30 m high hill. What is the Potential energy of the roller coaster?
(Formula: PE=mgh)
(g= 9.8m/s)
Answer:
The answer is 5880 JExplanation:
The potential energy of a body can be found by using the formula
PE = mgh
where
m is the mass
h is the height
g is the acceleration due to gravity which is 9.8 m/s²
We have
PE = 20 × 30 × 9.8
We have the final answer as
5880 JHope this helps you
Suppose the moon orbited the earth just half as fast as it does now.
How many high tides would any one area have in one day?
A-3
B-2
C-1
D-4
Answer:
Explanation: The correct answer is 1. Do not put 2 .
if atoms are made up of mostly space, why do objects feel like they are mostly solid
Answer:
dont question the world kid
Explanation:
Name the laws for 1,2, and 3
Answer:
1. Boyle's law
2. Charle's law
3. Ideal Gas law
Explanation:
equatinal by elimination melha
8n-3y = 18 and5x+6y=27
Answer:
x = 3 and y= 2
Explanation:
Given equations:
8x - 3y = 18 - ---- (I)
5x + 6y = 27 -------(II)
Solve this problem by elimination;
In the elimination method, we simply find a common term that can make one of the variables in the two equation the same. Then we either add or subtract to remove the variable.
Mulitply equation (i) by 5 to give equation III
Mulitply equation (II) by 8 to give equation IV
5(8x - 3y) = 5(18) ------- III
8(5x + 6y) = 8(27) ------- IV
40x - 15y = 90------- III
40x + 48y = 216 ------- IV
Subtract equation III and IV;
-15y - 48y = 90 - 216
- 63y = -126
y = 2
Solve for x;
40x - 15y = 90;
40x - 15(2) = 90
40x - 30 = 90
40x = 90 + 30
40x = 120
x = 3
What are the things to consider in classifying the different kinds of mixture?
Answer:
Whether the mixture can be separated
why can dogs not eat chocolate
How many H2O particles are in 6 moles of water?
Answer:
Thus, for example, one mole of water contains 6.02214076×1023 molecules, whose total mass is about 18.015 grams – and the mean mass of one molecule of water is about 18.015 daltons.
Explanation:
A does not change the substance into anything new
Answer:
Physical changes only change the appearance of a substance, not
chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions.
Explanation:
A 10.04-g block of solid tin at 14.77 °C is immersed in a 24.11-g pool of liquid ethylene glycol with a temperature of 63.52 °C. When thermal equilibrium is reached, what is the temperature of the tin and ethylene glycol? Specific heat capacities: tin = 0.213 J/g °C; ethylene glycol = 2.36 J/g °C
Answer:
61.75 °C
Explanation:
According to the law of conservation of energy,
Qtin = - (Qliquid)
(m×c×∆T)tin = -(m×c×∆T) ethylene glycol
Where; m = mass
c = specific heat capacity
∆T = change in temperature
According to the information given in this question;
For tin: m= 10.04g, c= 0.213 J/g °C, initial temperature= 14.77 °C, final temperature=?
For ethylene glycol: m= 24.11g, c= 2.36 J/g °C, initial temperature= 63.52 °C, final temperature=?
Hence; (m×c×∆T)tin = -(m×c×∆T) ethylene glycol
10.04 × 0.213 × (T - 14.77) = - {24.11 × 2.36 × (T - 63.52)}
2.139 (T - 14.77) = - {56.899 (T - 63.52)}
2.139T - 31.59 = -56.899T + 3614.225
2.139T + 56.899T = 31.59 + 3614.225
59.038T = 3645.815
T = 3645.815/59.038
T = 61.75 °C
The final temperature of tin and ethylene glycol is 61.75 °C
What are 3 common household items that you can identify 2 chemical properties if the item
Answer:
vacuum
Explanation:
because the government to take a look at the end of the day it was do people I
A mixture is made of two or more materials that
A. can be separated by physical means.
В.
cannot be separated by physical means.
C.
cannot be separated by any means.
D
can only be separated by chemical means.
Answer:
A. can be separated by physical means.
Explanation:
A mixture is when two different materials are put in the same container and no reaction occurs.
Write the chemical symbols for three different atoms or atomic cations with 26 electrons.
The chemical symbols for three different atoms or atomic cations with 26 electrons are Fe, [tex]Co^+[/tex], [tex]Ni^{2+}[/tex]
Explanation:
The atomic number of an atom is equal to the number of protonsAn atom is neutral, it has an equal number of electrons and protons.Element with atomic number 26 is Iron, Fe.A neutral atom of iron has an equal number of protons and electrons.Cobalt has an atomic number of 27.A neutral atom of cobalt has an equal number of protons and electrons.Cobalt has 27 electrons and by losing one electron it will form a cobalt (I) ion with 26 electrons.The cobalt (I) ion has 26 electrons, [tex]Co^+[/tex].Nickel has an atomic number of 28.A neutral atom of nickel has an equal number of protons and electrons.Nickel has 28 electrons and by losing two electrons it will form a nickel(II) ion with 26 electrons.The nickel (II) ion has 26 electrons,[tex]Ni^{2+}[/tex].So, from this, we can write chemical symbols for three different atoms or atomic cations with 26 electrons are Fe, [tex]Co^+[/tex], [tex]Ni^{2+}[/tex].
Learn more about ions here:
brainly.com/question/238050?referrer=searchResults
brainly.com/question/491497?referrer=searchResults
when heat is added to a substance describe how the molecules are affected?
Answer:
the molecules and atoms start to vibrate faster so basically the object starts to expand because the space between atoms increases :)
What is a system?
A. An isolated piece of the world
OB. A liquid in which reactions take place
O C. A piece of scientific equipment
O D. A technique for recording data
Answer:
D. a technique of recording data
A large marble is dropped in a graduated cylinder with 45 mL of water in it. The water level increased to 61 mL. What is the volume of the marble?
Answer:
Volume of the marble is 16 ml.
Initial volume present in graduated cylinder=45 ml.
Final volume in graduated cylinder after marble is dropped=61 ml.
Volume of water displaced=volume displaced by marble.
Volume displaced by marble=final volume in cylinder-initial volume in cylinder
Volume displaced=61ml-45ml=16ml
So volume of marble=16ml.
Answer:
16mL
Explanation:
How do I find the number of atoms using a chemical formula? ex: 4 HNO3
you should
MOL × NA(Avogadro Constant)
Mol = 4
HNO3 = 5 Atome ( 1H + 1N + 3O)
NA = 6.02 × 10* ( * = 23)
[tex]4 \times 5 \times 6.02 \times {10}^{23} = 20 \times 6.02 \times {10}^{23} = 120.4 \times {10}^{23}atom [/tex]
Answer:
2.408 x 10^24
GREETINGS!
One mole of a substance is equal to 6.02 × 10²³ units of that substance. The number 6.022 × 10²³ is known as Avogadro's number.
so if one mole of molecule is equal to that number so,
for 4 moles of [tex]HNO_{3}[/tex]= 4 x ([tex]6.02x10^{23}[/tex])
so answer is,
2.408 x 10^24
HOPE IT HELPS YOU.
In order for a gas to condense to a liquid, the attraction between its molecules _____.
Answer:
._______.
Explanation:
Explanation:
The forces of attraction between one individual molecule and another. ... Gas phase molecules will in turn condense. ... The vapor pressure of a molecular substance depends on the strength of its ... If the external pressure on a liquid is increased, the vapor pressure of the liquid must___ in order for the liquid to boil.
Cone shaped mountains form as a result of which one of these events?
Answer:
Volcanic Eruptions
Explanation:
It says in the question
What’s this called
Please ASAP
Answer:
carbon dioxide CO[tex]{2}[/tex]
Explanation:
Double Polar Covalent bonds with CO2
Explanation:
Keep in mind that CO2 is a nonpolar molecule
:
Core is to Hot Iron AS Mantle is to:
A. Rigid Crust
B. Fragile Crust
C. Hard Rocks
D. Molten Rock
.
What is the effect of tap water, sea water, and rainwater on the rusting rate of iron?
(Please i need an answer π-π)
Answer:
The more acidic the solution the faster it rusts. More Na = more rust
Explanation:
WILL GIVE BRAINLIEST
12) The chemical formula for phosphorus trichloride is PCl3. In one to two sentences, explain how you would build a ball-and-stick model of phosphorus trichloride. Include a description of the parts of the model.(2 points)
13) Copper (Cu) reacts with sulfur (S) to form copper sulfide as shown in the chemical equation. A scientist adds 4 grams of Cu to 2 grams of S to start the reaction. At the end of the experiment, she has 6 grams of product. In one to two sentences, explain what would happen if the scientist increased the amount of copper to 6 grams, and why. (1 point)
Answer:
12) In the ball and stick model, an orange ball representing the phosphorus atom and three green balls representing chlorine atoms are connected by means of sticks that are coloured halfway green and orange respectively to represent the shared electrons between phosphorus and chlorine with the chlorine atoms forming the base of a triangular pyramid while the phosphorus atom forms the top of the pyramid.
13) The scientist will have 6 grams of product as before but will have two grams of unreacted copper atoms because the mass ratio of copper to sulfur in this reaction is 2:1
Explanation:
12) Phosphorus trichloride has a trigonal pyramidal structure and is composed of three atoms of chlorine and one atom of phosphorus.
In the ball and stick model, an orange ball representing the phosphorus atom and three green balls representing chlorine atoms are connected by means of sticks that are coloured halfway green and orange respectively to represent the shared electrons between phosphorus and chlorine with the chlorine atoms forming the base of a triangular pyramid while the phosphorus atom forms the top of the pyramid.
13) The reaction between copper and sulfur to form copper sulfide is shown in the equation below:
Cu + S ---> CuS
1 mole of copper reacts with 1 mole of sulfur to produce 1 mole of copper sulfide
molar mass of copper = 64 g/mol; molar mass of sulfur = 32 g/mol, molar mass of copper sulfide = 96 g/mol
mass ratio of copper to sulfur = 63 g/ 34 g = 2
This means that 2 grams of copper will react with 1 g of sulfur to produce 3 grams of product. similarly, 4 g of copper will react with 2 g of sulfur to produce 6 grams of product.
Therefore 6 g of of copper will react with 3 g of sulfur. However, since the amount of sulfur available for reaction is 2 g only, 2 g of copper will be left unreacted after 4 g has reacted completely with 2 g of sulfur to produce 6 g of copper sulfide.
Which of the following wave types must have a medium to travel?
A. Ultraviolet light
B. Microwaves
C. Seismic (earthquake) waves
D. Radio waves
E. X rays
Answer:
it is B
Explanation:
Answer: B microwaves
1. Matter that is composed of two or more different
elements chemically combined in a fixed proportion
is classified as
A) a compound
C) a mixture
B) an isotope
D) a solution
Two examples of silicate minerals are
Answer:
who know
Explanation:
how can prey benefit from the predator having a disease?
The disease can slow the predator down and the prey can get away easily.
What is hydrochloride acid plus water plus salt and water