Significant Figures
1. Indicate how many significant figures there are in cach of the following measured values.
un
246.32
5
1.008
700000
107.854
3
0.00340
3
350.670
4
100.3
14.600
1.0000
6
0.678
0.0001
320001

Answers

Answer 1
I think answer should be the first one please give me brainlest I hope this helps let me know if it’s correct I

Related Questions

What is this equation balanced?

Answers

Answer:

2Al + 6HCl —> 3H₂ + 2AlCl₃

Explanation:

From the question given above:

Al + HCl —> H₂ + AlCl₃

The above equation can be balance as illustrated below:

Al + HCl —> H₂ + AlCl₃

We have 1 atom of Cl on the left side and 3 atoms on the right side. It can be balance by putting 6 in front of HCl and 2 in front of AlCl₃ as shown below:

Al + 6HCl —> H₂ + 2AlCl₃

We have 6 atoms of H on the left side and 2 atoms on the right side. It can be balance by 3 in front of H₂ as shown below:

Al + 6HCl —> 3H₂ + 2AlCl₃

We have 1 atom of Al on the left side and 2 atoms on the right side. It can be balance by putting 2 in front of Al as shown below:

2Al + 6HCl —> 3H₂ + 2AlCl₃

Thus, the equation is balanced.

Explain in a short sentence how you can tell if a reaction is a double replacement
reaction.

Answers

Explanation:

In a double displacement reaction, there is an actual exchange of partners to form new compounds.

The reaction is given as shown below:

         AB + CD →  AD + CB

One of the following conditions serves as the driving force for a double replacement reaction:

Formation of an insoluble compound or precipitateFormation of water or any other non-ionizing compoundLiberation of a gaseous product.

State one part of Dalton’s Atoms Theory?

Answers

Answer:

The second part of the Dalton's atoms

theory says all atoms of a given element are identical in mass and properties.

Seasonal changes in water temperature tend to remain within a narrow range. This is opposed to air temperature, which tends to fluctuate across a wide range. The relative stability of ocean temperatures helps to regulate the temperatures of coastal regions. Why can water remain within a narrow range of temperatures?
A.
It reflects heat and does not absorb heat.
B.
It is only stable within a small temperature range.
C.
It has a high heat capacity.
D.
It is mobile and this allows heated water to sink.
Its C. i just did it

Answers

Answer:

Its C

Explanation:

Ok. You really know how.

Answer:

the answer would be b

Explanation:

1. What is the downward fores that acts on an airplane in flight?
B. drag
C. thrust
D. gravity

Answers

Answer: D. gravity

Explanation:

An airplane in flight is acted on by four forces: lift, the upward acting force; gravity, the downward acting force; thrust, the forward acting force; and drag, the backward acting force (also called wind resistance).

Good night India and good morning USA​

Answers

Answer:

Mornin'!

Explanation:

(Actually, it's the afternoon over where I am.)

Answer:

yes, there is a time difference according to the different time zones. It is about 10 hours and 30 minutes change according to India and Washington D.C

Explanation:

What does the formula of an ionic compound tell you?

Answers

Answer:

The overall ionic formula for a compound must be electrically neutral, meaning it has no charge. When writing the formula for the ionic compound, the cation comes first, followed by the anion, both with numeric subscripts to indicate the number of atoms of each.

Explanation:

The process of pumping oxygen-rich blood out of your heart into the rest of your body is _______.

A. picks up nutrients, water, and waste materials

B. pulmonary circulation

C. the lungs, where it picks up oxygen again

D. capillaries

E. 5

F. systemic circulation

Answers

Answer:

its A

Explanation:

Answer:

Pulmonary circulation.

Explanation:

The question is asking you to identify a process.  The process is pulmonary circulation.  While your blood certainly transports nutrients, water, and waste materials, that answer simply does not match the structure of the question.

how many feet is 1000 km?

Answers

Answer: 0.3 feet

Explanation:

0.0003048km=1ft

1,000*0.0003048= 0.3048

rounded would be 0.3

A compound contains carbon and hydrogen this compound goes through a combustion reaction such that compound y is produced from the hydrogen atoms in the reactant. What are compounds x and y

Answers

Answer:

x is CO2

y is H2O

Explanation:

An organic compound that contains carbon and hydrogen is called a hydrocarbon.

When a hydrocarbon is burnt in air (combustion) only two products are obtained; carbon dioxide and water. The carbon dioxide comes from the carbon component of the molecule while the water comes from the hydrogen component of the molecule.

Therefore, for a hydrocarbon CxHy we obtain; xCO2 and (x + 1)H2O as products.

Answer:

X is carbon dioxide, and Y is water.

Explanation:

I took the test.

define the clinical thermometer ​

Answers

Answer:

a small medical thermometer with a short but finely calibrated range, for taking a person's temperature.

Answer:

Thermometer which are used in clinical to measure the temperature of human body is called clinical thermometer.

The modern theory of the atom states that electrons do not travel in specific paths or orbits. Where do electrons travel? Can we predict where an electron may be found?

Answers

Answer:

1. When electric voltage is applied, an electric field within the metal triggers the movement of the electrons, making them shift from one end to another end of the conductor. Electrons will move toward the positive side.

2. Well, if you think about it logically, the Heisenberg Uncertainty Principle basically means that it's impossible to predict both exactly what the electron will do or exactly where the electron will be found.  In other words, when you know where the electron is going, you don't know where it is.

Pls answer my question to the best of your ability down the bottom of yours. Thankyou! :)

Why do molecules change the speed? (SELECT ONE)

 Claim 1: Molecules speed up when energy is created and slow down when energy is destroyed.

 Claim 2: Molecules speed up when they get energy from other molecules and slow down when they give energy to other molecules.

Answers

Answer:

Molecules speed up when they get energy from other molecules and slow down when they give energy to other molecules.

Explanation:

We know from the first law of thermodynamics that energy can not be created nor destroyed.

However, according to the kinetic molecular theory, molecules collide frequently with each other. All molecules in a substance do not possess equal energy hence some molecules are more energetic than others.

When a more energetic molecule collides with a less energetic molecule, the more energetic molecule transfers energy to the less energetic molecule. The less energetic molecule speeds up while the molecule that collided with it slows down due to energy transfer from one molecule to another.

what kind of bond would you find between two alike oxygen atoms

Answers

Answer:

Covalent bond

Explanation:

Answer: covalent bonds

BIOdotEDU. A water molecule consists of two atoms of hydrogen linked by covalent bonds to the same atom of oxygen. Atoms of oxygen are electronegative and attract the shared electrons in their covalent bonds.

Explanation:

which personal trait do scientists mainly depend upon when they design an experiment

Answers

Answer:

creativity is the personal trait that scientists mainly depend upon when they design an experiment.

PLEASE HELP ME FILL IN THE BLANKS

Answers

Answer:

The order the words go for the blanks

Explanation:

Interia

Rest

Constant

Unbalanced

Balanced

Distance

what charged particle is produced during ionic bonds

Answers

Answer:

An ionic bond is formed by the complete transfer of some electrons from one atom to another. The atom losing one or more electrons becomes a cation or a positively charged ion. The atom gaining one or more electrons becomes an anion which is a negatively charged ion.

Identify the following as a chemical (C) or physical property (P):
1. blue color ______
2. melting point ______
3. density ______
4. reacts with water ______
5. flammability (burns) ______
6. solubility (dissolves) ______
7. boiling point ______
8. luster ______

Answers

Answer: 1. Phys 2. Phys 3. Phys 4. Chem 5. Chem 6. Phys 7. Phys 8. Phys

Explanation:

According to the concept of physical and chemical property ,reaction with water and flammability are chemical properties while rest are physical properties.

What are chemical  properties?

These properties are defined as those properties which become evident during or after a chemical reaction after the identity of the substance is changed during chemical reaction.

These properties cannot be determined externally just by viewing the substance ,these change immensely after a substance undergoes a chemical change.These are used for identification of unknown substances and for building up chemical classifications.

The major chemical properties are flammability,toxicity,reactivity,acidity and heat of combustion.For a chemical property to be apparent , it is necessary that the structure of the substance is altered.

Learn more about chemical properties,here:

https://brainly.com/question/5186976

#SPJ2



A woman has pain in her ovaries. In which
quadrants of her abdominopelvic cavity might she
be experiencing pain?
Check all that apply.
the right lower quadrant
the left lower quadrant
the left upper quadrant
the right upper

Answers

Answer:

The right lower quadrant

The left lower quadrant

Explanation:

Those quadrants contain the ovaries and I just got it correct on the assignment.

Name a famous scientists and why they're
famous.

Answers

Answer:

Nikola Tesla

Explanation:

He made electricity major, he invented the first AC, and developed AC generation and transmission tech.

Uranium has three common isotopes. If the abundance of 234U is 0.0054%, the abundance of 235U is 0.7204% and the abundance of 238U is 99.2742%, what is the average atomic mass of uranium?

Answers

Answer:

237.9 amu

Explanation:

Given data:

Abundance of U-234 = 0.0054 %

Abundance of  U-235 = 0.7204%

Abundance of  U-238 = 99.2742%

Average atomic mass = ?

Solution:

Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) + (abundance of 3rd isotope × its atomic mass  / 100

Average atomic mass = (0.0054×234)+(0.7204×235) +(99.2742×238)  /100

Average atomic mass =  1.2636+ 169.294+ 23627.2596 / 100

Average atomic mass = 23797.8172/ 100

Average atomic mass = 237.9 amu.

Write a complete balanced equation for the following reaction:
magnesium metal reacts with oxygen gas

Answers

Explanation:

Given species:

     Magnesium metals  = Mg

      Oxygen gas  = O₂  

Magnesium metal and oxygen gas are the reactants in this chemical process,

              2Mg + O₂   →   2MgO

The product of the reaction is MgO because both oxygen and magnesium are divalent.

This reaction is called a combination reaction where two species combines to form a single compound.

Which of the following reagents can be used to distinguish between sodium sulphite and sodium sulphate?
(1) iron(II) chloride solution
(2) acidified potassium permanganate solution
(3) concentrated nitric acid
A. (1) only
B. (2) only
C. (1) and (3) only
D. (2) and (3) only

please please help this confused me for so long​

Answers

The answer is A si yeah

Which statements about freshwater sources are true? Check all that apply.
O Only about 3 percent of Earth's water ís fresh water.
O Most of the fresh water on Earth is groundwater.
O About 75 percent of the fresh water on Earth is frozen in ice sheets.
O The largest source of usable fresh water is groundwater.
O More fresh water is in the atmosphere than in rivers and lakes.

Answers

Answer:

Explanation:

1 is true

2 is false

3 is true

4 is true

5 is false

That is what I got from researching.

Only about 3% of the water in the Earth is fresh water and about 75 % of the fresh water on Earth is frozen in ice sheets.  

• The most vital element present on the Earth is water. All the living beings are dependent on it.  

• Water is present in the majority of the Earth, however, of this only 3% of the water is freshwater, the rest is saline and undrinkable.  

• Of this 3%, the 75 percent of the freshwater is present in the form of ice and glaciers in the polar region.  

• The remaining 24 percent is the groundwater and the rest 1 percent includes the waters of rivers, lakes, and ponds.  

• The prime source of usable freshwater is present in the trapped form in the ice and glaciers.  

Thus, the correct statements are 1st and 3rd.

To know more about:

https://brainly.com/question/11981746

(AKS 2e) Group 2 metals bond with nonmetals or polyatomic ions. What question

would a student need to know to form a compound with Group 2 metals? (DOK 2)

Will group 2 elements lose electrons to bond with nonmetals in group 17 in a

1:2 ratio?

Will group 2 elements lose electrons to bond with nonmetals in group 16 in a

2:1 ratio?

Will group 2 elements gain electrons to bond with nonmetals in group 17 in a

1:2 ratio?

Will group 2 elements gain electrons to bond with nonmetals in group 16 in a

2:1 ratio?

Answers

Answer:

Will group 2 elements lose electrons to bond with nonmetals in group 17 in a

1:2 ratio?

Explanation:

Metals are electropositive in nature. This means that they loose electrons. Thus, metals form ionic bonds by loosing electrons to non metals.

Elements of group 2 have a valency of 2 while those of group 17 has a valency of 1 so the ratio in which group 2 elements bond with elements of group 17 is 1:2. Hence the answer.

What are the rows of the periodic table called?
O A. Atoms
O B. Groups
O C. Elements
O D. Periods

Answers

Answer:

B. Groups

Explanation:

It would Be (D) periods !


How many moles are in 43 grams of lithium (LI)?

Answers

Answer:

6.19507275608684

Explanation:


The compound has the empirical formula of CH. Give some possible molecular formulas for this compound if you didn't know the molar mass.

Answers

Answer:

Convert the mass of each element to moles using the molar mass from the periodic table. Divide each mole value by the smallest number of moles calculated. Round to the nearest whole number. This is the mole ratio of the elements and is represented by subscripts in the empirical formula.

Explanation:

The result is the molecular formula

In a reaction, 2mol of oxygen reacts with 8g of ethane to produce carbon dioxide and water, calculate the mass of carbon dioxide formed in this reaction. 2C2H6 +7O2 > 4CO2 +6H2O

Answers

Answer:

The mass of carbon dioxide formed in the reaction is 23.47 grams.

Explanation:

The balanced reaction is:

2 C₂H₆ +7 O₂ ⇒ 4 CO₂ + 6 H₂O

By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of each compound participate in the reaction:

C₂H₆: 2 moles O₂: 7 moles CO₂: 4 molesH₂O: 6 moles

Being the molar mass of the compounds:

C₂H₆: 30 g/moleO₂: 16 g/mole CO₂: 44 g/moleH₂O: 18 g/mole

By reaction stoichiometry, the following mass amounts of each compound participate in the reaction:

C₂H₆: 2 moles* 30 g/mole= 60 gO₂: 7 moles* 16 g/mole= 112 gCO₂: 4 moles* 44 g/mole= 176 gH₂O: 6 moles* 18 g/mole= 108 g

The limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.

To determine the limiting reagent, you can use a simple rule of three as follows:  if by stoichiometry of the reaction 7 moles of O₂ react with 60 g of C₂H₆, 2 moles of O₂ will react with how much mass of C₂H₆?

[tex]mass of C_{2}H_{6} =\frac{2 moles of O_{2}* 60 grams of C_{2}H_{6} }{7 moles of O_{2}}[/tex]

mass of C₂H₆= 17.14 grams

But 17.14 grams of C₂H₆ are not available, 8 grams are available. Since you have less moles than you need to react with 2 moles of O₂, ethane C₂H₆ will be the limiting reagent.

Then, it is possible to determine the amount of mass of CO₂ produced by another rule of three: if by stoichiometry 60 grams of C₂H₆ produce 176 grams of CO₂, how many mass of CO₂ will be formed if 8 grams of C₂H₆ react?

[tex]mass of CO_{2} =\frac{8 grams of C_{2}H_{6}* 176 grams of CO_{2} }{60 grams of C_{2}H_{6}}[/tex]

mass of CO₂= 23.47 grams

The mass of carbon dioxide formed in the reaction is 23.47 grams.

Marissa uses her bicycle to do a morning paper route. Starting at her home, she travels 3 km North, then 1 km East, then 3 km North, and lastly 1 km West. She completes the root in 1.5 hours. a. What is your displacement in regards to her home?
b. What is her velocity?

Answers

a. displacement = 6 km

b. velocity = 4 km/h

Further explanation

Given

a morning paper route

Required

displacement

velocity

Solution

Displacement is a vector quantity that shows changes in the position of objects in a certain interval of time. Displacement has magnitude and direction

Can be simplified displacement = distanced traveled from starting point to ending point

a. Since we only consider the starting point and the end point, we just need to add up the distances to the north

3 km + 3 km = 6 km

b. Velocity = displacement changes with time

[tex]\tt v=\dfrac{d}{t}=\dfrac{6~km}{1.5}=4~km/h[/tex]

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