Answer:
In your science class, you will learn about Newton’s laws of motion. Do you know why these laws are so important? When you throw a baseball or you bounce a basketball on the court, you can use Newton’s laws to explain the motion of the baseball or basketball. In fact, almost all motion in the world can be explained by these laws. Newton’s laws are useful when people design airplanes, trains, cars, sports equipment, toys, and many things that have to do with motion. Some people have trouble understanding Newton’s laws of motion because it’s hard to see how the laws work without any examples. One great way to understand these laws is to look at how they relate to cars in everyday life.
The First Law of Motion
“Every object persists in its state of rest or uniform motion in a straight line unless it is compelled to change that state by forces impressed upon it.”
Can you see why it’s hard for some people to understand the first law? Those are some complicated words. To help you to understand better, let’s break it down and use the example of a car. The first part deals with an object in a “state of rest”. This means that the object is not moving. When your mom or dad parks the car in the garage or the shopping mall, the car is said to be in a “state of rest” because it is not moving. The car will not move until the engine is started and somebody drives it away. The second part deals with an object in “uniform motion”. This means that the object is moving at the same speed. When you mom or dad is using “cruise control” on a highway at 60 miles per hour, the car will be moving at that speed in a “straight line” until something happens to change it. What is this change? It depends. By using the brakes, your mom or dad can slow the car down or bring it to a stop. On the other hand, the car’s direction will be changed if it is hit by another motor vehicle.Explanation:
1 poin
9. In an experiment, the one variable that is changed on purpose by the
scientist is called the
controlled variable
experimental variable
independent variable
dependent variable
Answer:
It's called Independent variable
Explanation:
....
HELPPPP!!!! SCIENCE!!!!
Answer:
Both are only physical changes
Assignment
Name the type of bond present in each of the following
compounds
Aluminium Oxide ,Al3 O₂)
Answer:
[tex]\boxed {\boxed {\sf Ionic \ bond}}[/tex]
Explanation:
First, let's look at the Periodic Table.
We see that aluminum is a metal, while oxygen is a non-metal.
Now, let's recall three types of bonds
Ionic: typically forms between a metal and a non-metal Covalent: usually forms between non-metals Metallic: tends to form with metalsSince we have a metal (Al) and a non-metal (O), aluminum oxide must have an ionic bond.
A forensic chemist performs a flame test on a substance found at a crime scene. What can the scientist conclude it the sample produces a green flame?
Answer: The forensic examination of substances involve a preliminary flame test.
Explanation:
The forensic chemical analysis of samples involves the flame testing which is one of the preliminary test. The materials are burned on a flame and the color of the flame is considered indicative of the elements present in the material.
The substances like Borax (sodium borate), Copper(II) sulfate, and boric acid burn with a characteristic green flame.
Please help fast...please
Answer:
Radioactive
Explanation:
hope this helped! :)
A block of iron has the dimensions of 3.00 cm × 3.00 cm × 3.00 cm. It has a mass of 213 g. What is it's density?
Answer:
About 7.89g/cm^3, I think.
Explanation:
Find the volume. Divide the mass by the volume.
Which has weak dispersion forces in between layers?
graphite
diamond
fullerence
none of these
Answer:
a: graphite.
Explanation:
According to the forces of attraction, graphite has weak dispersion forces in between layers.
What are the forces of attraction?Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
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Question 1 of 10
What would you need to do to calculate the molality of 10 mol of NaCl in 200
mol of water?
A. Convert the 200 mol of water to kilograms of water.
B. Convert the 200 mol of water to liters of water.
C. Convert the 10 mol of NaCl to grams of NaCl.
O D. Convert the 10 mol of NaCl to kilograms of NaCl.
SUBMIT
A. Convert the 200 mol of water to kilograms of water.
Further explanationMolality (m) shows the number of moles dissolved in every 1000 grams(1 kg) of solvent.
[tex]\tt m=n\times \dfrac{1000}{p}[/tex]
m = Molality
n = number of moles of solute
p = Solvent mass (gram)
or
[tex]\tt m=\dfrac{mol~solute}{kg~solvent}[/tex]
solute = 10 mol NaCl
solvent = 200 mol water⇒Convert to kilograms of water.
What similarity is there between a straight-chain four-carbon alkane and alkyne?
A) the boiling points
B) the number of single bond s
C) the number of hydrogen atoms
D) the way the atom's rotate within the molecules
pls help ASAP I am literally so tired I hate this so much
will mark BRAINLIEST!!!
Answer:
c
Explanation:
Answer:
Boron and Carbon
Explanation:
They both are in Group 14 in the Periodic Table of Elements.
Suppose the isotopic ratio of the two boron isotopes 10B (10.013 amu) and 11B (11.009 amu) in a sample has been altered from the ratio found in nature and now contains 33.36% 10B in the sample. Determine the atomic weight of this sample of this new boron element.
Answer:
The correct answer is 10.676 amu.
Explanation:
Based on the given information, the concentration of 10B left in the sample is 33.36%. Therefore, the percentage of 11B present will be,
11B = 100% - 33.36% = 66.64%
Now the atomic weight of the new boron element can be determined by adding the atomic masses of both the isotopes multiplied by its percentage.
Therefore,
= (10.013 amu * 33.36%) + (11.009 amu * 66.64%) / 100
= 10.676 amu
hi help me pls I don't know how to do this
O - Oxide
N - Nitride
Cl - Chloride
Br - Bromide
Sulfide - S^2-
Iodide - I^-
Phosphide - P^3-
Flouride - F^-
When you have a non-metal, it ends in -ide when you place it into a chemical bond. These are all diatomic molecules (apart from phosphorus) and as such you take the element name, remove the suffix, and add -ide. When converting back, look at the electronegativity levels on your periodic table in the upper right corner of each element. (if you don't have them, google "nyc regents chemistry reference table" and go to page 6 of the first result.) The first charge in that spot is what the charge will be.
Identify each statement below as an example of science or pseudoscience.
If food dropped on the floor is picked up within 5 seconds, it is okay to eat.
science or pseudoscience
Answer: pseudoscience
Explanation:
Edge 2020
Answer: pseudoscience
Explanation: It is an opinion that is subjective.
What is the volume of a balloon containing 0.75 moles of gas at STP?
Answer:
V = 16.81 L
Explanation:
Given data:
Number of moles = 0.75 mol
Temperature = standard = 273 K
Pressure = 1 atm
Volume of balloon = ?
Solution:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
Now we will rearrange the formula.
V = nRT/P
V = 0.75 mol ×0.0821 atm.L/mol.K ×273 K / 1 atm
V = 16.81 atm.L/ 1 atm
V = 16.81 L
Please help!
A chemical _________________ represents what happens in a chemical
reaction.
A.) Conservation
B.) Product
C.) Equal
D.) Reactant
E.) Equation
F.) Rearranged
Answer:
it is D. Reactant
Explanation:
Answer:
D
Explanation:
A chemical reaction is a process in which one or more substances, also called reactants.
Jamal draws the circuit diagram shown.
There are three light bulbs shown in the diagram. How
many of each additional component are shown?
O one battery, two switches, two resistors
O two batteries, three switches, two resistors
O one battery, four switches, one resistor
O two batteries, three switches, two resistors
There are three light bulbs shown in the diagram, additional component that are present in the circuit is one battery, two switches and two resistors
What is circuit diagram?Circuit diagram is also known as electrical diagram or elementary diagram which is a graphical representation of electrical circuit.
In the given diagram, two resistance is present which are represented by the zig zag symbol. One battery is also present which is represent on the right right at the vertical part and two switches are present which are present on the top right side and one on the left side below bulb.
Hence, one battery, two switches, two resistors are present in the circuit.
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Mixing salt with water is an example of a _________change. *
physical change
chemical change
Answer:
physical
Explanation:
no chemical reaction is happening
What does aqueous mean in a chemical equation?
Answer: a solution where the solvent is water
Explanation: solute ions which are known as the dissolvable ions and molecules are surrounded by water molecules and then get incorporated into the bonding network of water
What is the mass of 2.23 x 1023 atoms of sulfur?
Answer:
11.9 g S
General Formulas and Concepts:
Chem
Reading a Periodic TableAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Dimensional AnalysisExplanation:
Step 1: Define
2.23 × 10²³ atoms S
Step 2: Define conversions
Avogadro's Number
Molar Mass of S - 32.07 g/mol
Step 3: Dimensional Analysis
[tex]2.23 \cdot 10^{23} \ atoms \ S(\frac{1 \ mol \ S}{6.022 \cdot 10^{23} \ atoms \ S} )(\frac{32.07 \ g \ S}{1 \ mol \ S} )[/tex] = 11.8758 g S
Step 4: Check
We are given 3 sig figs. Follow sig fig rules.
11.8758 g S ≈ 11.9 g S
PLZ HELP GIVING BRAINLEST TO WHOEVER HELPS ME AND GETS THE RIGHT ANSWER
What kind of energy is light considered to be?
1. Radiant
2. Sound
3. Potential
4. Chemical
Answer:
radiant
Explanation:
Radiant Energy
This should do it.
How many electrons are in a chromium(III) ion, Cr3+?
Answer:
24 electrons
Explanation:
In order to write the Chromium electron configuration we first need to know the number of electrons for the Cr atom (there are 24 electrons). Once we have the configuration for Cr, the ions are simple.
I hope this is correct!
Help me Come up with my own question about a physical or chemical change
Answer:
What kind of properties result in the substance changing into a new substance?
A) Liquid Properties
B) Physical Properties
C) Chemical Properties
D) Real Properties
Edit: I don't like that question, so here another one instead...
Which of the following statement is incorrect for a chemical reaction?
A) Heat may be given out but never absorbed.
B) Sound may be produced.
C) A color change may take place.
D) A gas may be evolved
Explanation:
Answer:
Which of the following matches the correct definition to an example?
A. Chemical Change: My foot changes color
B. Physical Change: My microwave exploded
C. Chemical Change: My dog ate my homework
D. Physical Change: My homework burned in a fire
Also can u pls mark me brainliest im new pls
Color, texture, and odor are examples of __________ properties. *
a.chemical
b.physicist
c.physique
d.physical
Answer:
I think the answer is c)
Explanation:
Please help i don’t know what to say
Answer:
Explanation:
Groundwater spread over the years
why copper is important in electrical works?
What is the missing word? When biofuels are burned they release the same amount of carbon dioxide as was removed from the atmosphere
by the plant. Biofuels are therefore described as being carbon___
Answer:
Many scientists view biofuels as inherently carbon-neutral: they assume the carbon dioxide (CO2) plants absorb from the air as they grow completely offsets, or “neutralizes,” the CO2 emitted when fuels made from plants burn.
Explanation:
put in your own words, happy to help
To solve such this we must know the concept of combustion reaction. Therefore, the missing word is neutral that is Biofuels are therefore described as being carbon neutral.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
When biofuels are burned they release the same amount of carbon dioxide as was removed from the atmosphere by the plant. Biofuels are therefore described as being carbon neutral. the products of combustion reaction are carbon dioxide and water.
Therefore, the missing word is neutral.
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Which two changes of state can be caused by removing thermal energy from a substance? choose two
A. Vaporization
B. Condensation
C. Deposition
D. Sublimation
Answer:
B and C
Explanation:
The correct answer is Condensation and Deposition
Answer:
Explanation:
It is Deposition and Condensation
Two spheres are measured and are both found to have a mass of 24 grams.If sphere A has a density of 12 g/mL and sphere B has a density of 3 g/mL.What can you conclude about the volume of each?
Answer:
Volume of sphere A = 2 mL
Volume of sphere B = 8 mL
The volume of sphere B is 4 times the volume of sphere A.
Explanation:
We'll begin by calculating the volume of each sphere.
Data obtained from the question include:
Sphere A:
Mass = 24 g
Density = 12 g/mL
Volume =?
Sphere B:
Mass = 24 g
Density = 3 g/mL
Volume =?
Next, we shall determine the volume of each sphere. This can be obtained as follow:
For sphere A:
Density = mass /volume
12 = 24/volume
Cross multiply
12 × volume = 24
Divide both side by 12
Volume = 24/12
Volume = 2 mL
For sphere B:
Density = mass /volume
3 = 24/volume
Cross multiply
3 × volume = 24
Divide both side by 3
Volume = 24/3
Volume = 8 mL
Summary:
Volume of sphere A = 2 mL
Volume of sphere B = 8 mL
Comparing the volume of both sphere, we have:
Va /Vb = 2/8
Va /Vb = 1/4
Cross multiply
Va × 4 = Vb
Vb = 4Va
From the above illustration,
The volume of sphere B is 4 times the volume of sphere A.
It has been concluded that the volume of sphere A has been 4 times greater than the volume of sphere B.
Density can be defined as the mass per unit volume. Density can be expressed as:
Density = [tex]\rm \dfrac{Mass}{Volume}[/tex]
Sphere A has a mass of 24 grams, and a density of 12 g/ml.
Sphere B has a mass of 24 grams and a density of 3 g/ml.
Since the spheres have the same mass, the relationship can be given as:
Density of A × Volume of A = Density of B × Volume of B
12 × Volume of A = 3 × Volume of B
4 × Volume of A = Volume of B
Thus, it has been concluded that the volume of sphere A has been 4 times greater than the volume of sphere B.
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A LA TEMPERATURA DE 35°C, UNA MUESTRA DE DIOXIDO DE CARBONO OCUPA UN VOLUMEN DE 350 ML. ¿Qué CAMBIO DE VOLUMEN SE PRODUCIRA SI LA TEMPERATURA DESCIENDE A 15°C?
Answer:
New volume = 150 mL
Explanation:
Initial temperature, T₁ = 35°C
Initial volume, V₁ = 350 mL
We need to find the change in volume when the temperature drops to 15°C.
The relation between the temperature and the volume is given by Charle's law. Let new volume is V₂. It can be given by :
[tex]\dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}\\\\V_2=\dfrac{V_1T_2}{T_1}\\\\V_2=\dfrac{350\times 15}{35}\\\\V_2=150\ mL[/tex]
So, the new volume is 150 mL.