The element rubidium forms a _______ with the charge . The symbol for this ion is , and the name is . The number of electrons in this ion is .

Answer:

its also a mixture of gold.

Explanation:

Answer:

(a) Dissolving sugar in water  ⇒ physical change

(b) Crushing rock salt  ⇒ physical change

(c) Burning sulfur  ⇒ chemical change

(d) Digesting a chili dog ⇒ chemical change

Explanation:

Physical changes are those in which the substance does not alter its composition. They only involve changes of states of  matter and the chemical substance is stil the same after the change occurs. By other hand, chemical changes are those in which new subtances are formed. So, the subtance is not the same after the change.

(a) Dissolving sugar in water  ⇒ physical change; because we obtain a solution of sugar in water (sugar is stil sugar).

(b) Crushing rock salt  ⇒ physical change; because we obtain crushed salt, but the chemical composition of the salt is not altered.

(c) Burning sulfur  ⇒ chemical change; because sulfur is oxidized (chemical reaction) and new compounds are formed, for example sulfur dioxide.  

(d) Digesting a chili dog ⇒ chemical change; because the digestion process is produced by the action of hydrocloric acid, and new compounds are formed.

Answer:

200x

Explanation:

The total magnification of a microscope depends on the power of the eyepiece and that of the objective lens. It is obtained by multiplying the two factors together.

The total magnification of a microscope can be mathematically expressed as:

Total Magnification = ocular/eyepiece magnification x objective magnification

In the illustration, eyepiece magnification = 10 and objective magnification = 20. Hence,

Total Magnification = 10 x 20 = 200x

The magnification power of the microscope has been 200X. Thus, option B is correct.

A microscope has been the instrument used for the analysis of the magnified image of micro-sized or small objects.

The microscope has been consisted of the objective lens and eyepiece that adjusts the level of magnification of the microscope.

The magnification of the microscope has been the product of the power of the eyepiece and objective lens.

Magnification power = Objective lens power [tex]\times[/tex] Eyepiece power

The given power of objective lens = 20

The power of the eyepiece = 10

Magnification power = 20 × 10

Magnification power = 200X.

The magnification power of the microscope has been 200X. Thus, option B is correct.

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Answer:

490 in^3 = 8.03 L

Explanation:

Given:

The engine displacement = 490 in^3

= 490 in³

To determine the engine piston displacement in liters L;

(NOTE: Both in^3 (in³) and L are units of volume). Hence, to find the engine piston displacement in liters (L), we will convert in^3 to liters (L)

First, we will convert in³ to cm³

Since 1 in = 2.54 cm

∴ 1 in³ = 16.387 cm³

If 1 in³ = 16.387 cm³

Then 490 in³ =  (490 in³ × 16.387 cm³) / 1 in³ = 8029.63 cm³

∴ 490 in³ = 8029.63 cm³

Now will convert cm³ to dm³

(NOTE: 1 L = 1 dm³)

1 cm = 1 × 10⁻² m = 1 × 10⁻¹ dm

∴ 1 cm³ = 1 × 10⁻⁶ m³ = 1 × 10⁻³ dm³

If 1 cm³ = 1 × 10⁻³ dm³

Then, 8029.63 cm³ = (8029.63 cm³ × 1 × 10⁻³ dm³) / 1 cm³ = 8.02963 dm³

≅ 8.03 dm³

∴ 8029.63 cm³ = 8.03 dm³

Hence, 490 in³ = 8029.63 cm³ = 8.03 dm³

Since 1L = 1 dm³

∴ 8.03 dm³ = 8.03 L

Hence, 490 in³ = 8.03 L

An engine piston displacement of 490 in³ is equivalent to 8.03 L.

The engine piston displacement is 490 in³ and we want to convert it to liters. Since both of them are units of volume, we will need one or more conversion factors.

A conversion factor is an arithmetical multiplier for converting a quantity expressed in one set of units into an equivalent expressed in another.

We will use the conversion factor 1 in = 2.54 cm.

490 in³ × (2.54 cm/1 in)³ = 8.03 × 10³ cm³

We will use the conversion factor 1 L = 1000 cm³.

8.03 × 10³ cm³ × (1 L/1000 cm³) = 8.03 L

An engine piston displacement of 490 in³ is equivalent to 8.03 L.

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object  A has a larger volume than object B

Answer:

See explanation

Explanation:

The ability of a hydride to act as a reducing agent depends on the electro negativity of the central atom in the complex hydride anion.

If we compare the electronegativities of Boron and Aluminum, Boron is more electronegative than aluminum. The more electronegative the central atom is, the lesser the electron density on the hydride and the lesser its ability to act as a reducing agent.

For the reason stated above, LiAlH4, having aluminium of low electro negativity as its central atom is a better reducing agent than NaBH4.

Answer:

=10 joules

when multiplying with newtons ( the unit of force)

by a perimeter, it will becone joules, but the specific amount depends on how many newtons and metres there are

Answer:

NH₃

Explanation:

The hydrogen bond is a specially strong type of dipole-dipole interaction. For a hydrogen bond to occur, a molecule must have a hydrogen atom and a very electronegative atom, such as nitrogen, oxygen or fluorine. The hydrogen atom has a positive charge density while the heteroatom has a negative charge density.

Which of the following molecules can form hydrogen bonds?

NH₃ YES

NaH NO

HI NO

BH₃ NO

CH₄ NO

Step 7- Communicate. Present/share your results. Replicate.

Step 1- Question.

Step 2-Research.

Step 3-Hypothesis.

Step 4-Experiment.

Step 5-Observations.

Step 6-Results/Conclusion.

Answer:

half water, half alcohol

Explanation:

Some inks are water soluble while some are alcohol soluble. Inks that do not dissolve in water usually dissolve in alcohol.

If inks are to be separated by chromatography, we have to make the mobile phase a mixture of alcohol and water in order for the dots to move the most.

Answer:

alcohol

Explanation:

Answer:

density is a PROPERTY that DESCRIBES the MASS of an object to its VOLUME.

Explanation:

Answer:

[tex]$ CaCl_2$[/tex], CaS, [tex]$ Cr Cl_4$[/tex], [tex]$ CrS_2$[/tex]

Explanation:

The reaction can be done by adding the cations and the anions.

The binary compounds are always formed by the two different elements.

When one calcium ion, [tex]$ Ca ^{2+} $[/tex] combines with the two calcium ions, [tex]$ Cl^-$[/tex], they formed a binary compound of [tex]$ CaCl_2$[/tex].

When one [tex]$ Ca ^{2+} $[/tex] combines with one [tex]$S^{2-}$[/tex] ion, they formed CaS binary compound.

When one chromium ion [tex]$ Cr^{4+}$[/tex] combines with four ions of chlorine, [tex]$ Cl ^- $[/tex], the compound formed is [tex]$ Cr Cl_4$[/tex].

When 1 ion of [tex]$ Cr^{4+}$[/tex] combines with 2 ions of sulphur, [tex]$S^2$[/tex], the binary compound formed is [tex]$ CrS_2$[/tex].

Explanation:

plant cells are rigid in shape

animal cells are flexible in shape

animal cell are flexible because of their movement around

plant cells are rigid cause they stay without walking around

Answer:

It would change to a strong Red color

Explanation:

Cyanidin indicators turn strong red in acidic solutions and blue or green in a basic environment

Given :

Number of heart beat in 1  minute , n = 70 .

The individual lives for 85 years .

To Find :

The number of heartbeats in their lifespan .

Solution :

Now , number of minutes in one hour is 60 .

One day contains 24 hours .

Therefore , minutes in one whole day :

[tex]24\times 60 = 1440\ sec[/tex]

Now , 1 year contains 365 days .

( Note : We are not considering any leap years )

Minutes in one year are :

[tex]365\times 1440=525600=5.25\times 10^5\ sec[/tex]

So ,total minutes in 85 years is :

[tex]=5.25\times 10^5\times 85\\\\=4.46\times 10^7\ sec[/tex]

Hence , this is the required solution .

Answer:

68.97g of milk must be added

Explanation:

To solve this problem we need to use the equation:

Q = C*m*ΔT -Coffee cup calorimeter equation-

This equation relates mass and change in temperature with heat of solution, Q.

The energy that decreases in the milk is the same that increases in the milk. That is:

Q(milk) = Q(tea)

Using the equation:

4.184J/molK* Mass milk * (65.0°C - 7.00°C) = 4.184J /molK * 200g (Tea) * (85.0°C - 65.0°C)

Mass milk * 58.0°C = 200g * 20.0°C

Mass milk = 4000g°C / 58.0°C

Mass milk =

Answer:

435 mL

Explanation:

Step 1: Given data

Step 2: Calculate the final volume of the solution

We want to prepare a diluted solution from a concentrated one. We can calculate the final volume of the solution using the dilution rule.

C₁ × V₁ = C₂ × V₂

V₂ = C₁ × V₁ / C₂

V₂ = 0.500 M × 87.0 mL / 0.100 M

V₂ = 435 mL

It might affect the health of consumer of that meat. Hope it helps

Answer: 252

Explanation:

# turn F to C

C=(F-32)5/9

C=(-5-32)5/9

C=-37 × (5/9)

C= -21

# turn C to K

K=C+273

K=(-21)+273

K=252

Answer:

253 Kelvins

Explanation:

We want to convert -5°F to Kelvins.

First, we must convert -5°F to Celsius. The formula is:

°C= (°F - 32) * 5/9

Plug -5 in for °F.

°C= (-5-32) * 5/9

Solve inside the parentheses first. Subtract 32 from -5.

°C= (-37) * 5/9

Multiply -37 and 5/9.

°C= -20.5555556

-5° F is equal to -20.5555556° C.

Next, convert Celsius to Kelvins. The formula is:

K= °C + 273.15

Plug -20.5555556 in for °C.

K= -20.5555556 + 273.15

Add -20.5555556 and 273.15.

K= 252.594444

Round to the nearest whole number. The 5 in the tenth place tells us to round 252 to 253.

K ≈ 253

-5°F is equal to about 253 Kelvins.

Answer:

SO3(g) + H2O(l) ------> H2SO4(aq)

Explanation:

'Redox' is a term used to describe reduction and oxidation since the both are complementary processes, one can not occur without the other.

A redox reaction is one in which there is a change in the oxidation number of the reactants from left to right of the reaction equation.

If we looks at the reaction;

SO3(g) + H2O(l) ------> H2SO4(aq)

There was no change in the oxidation numbers of species from left to right of the reaction equation. For instance, the oxidation state of sulphur is +6 on both sides of the reaction equation hence it is not a redox reaction.

Answer :

Part (e): [tex]C_2=\frac{C_1\times P_2}{P_1}[/tex]

Part (f): [tex]P_2=\frac{C_2\times P_1}{C_1}[/tex]

Part (g): [tex]\text{Volume}=\frac{\text{Mass}}{\text{Density}}[/tex]

Explanation :

Part (e):

The given expression is:

[tex]\frac{C_1}{P_1}=\frac{C_2}{P_2}[/tex]

Now rearranging the the terms, we get:

[tex]C_2=\frac{C_1\times P_2}{P_1}[/tex]

Part (f):

The given expression is:

[tex]\frac{C_1}{P_1}=\frac{C_2}{P_2}[/tex]

Now rearranging the the terms, we get:

[tex]P_2=\frac{C_2\times P_1}{C_1}[/tex]

Part (g):

The given expression is:

[tex]\text{Density}=\frac{\text{Mass}}{\text{Volume}}[/tex]

Now rearranging the the terms, we get:

[tex]\text{Volume}=\frac{\text{Mass}}{\text{Density}}[/tex]

Explanation:

Hydrogen (H)

Helium (He)

Lithium (Li)

Beryllium (Be)

Boron (B)

Carbon (C)

Nitrogen (N)

Oxygen (O)

Fluorine (F)

Neon (Ne)

Sodium (Na)

Magnesium (Mg)

Aluminum (Al)

Silicon (Si)

Phosphorus (P)

Sulfur (S)

Chlorine (Cl)

Argon (Ar)

Potassium (K)

Calcium (Ca)

Hope this is correct and helpful

HAVE A GOOD DAY!

Answer:

[tex]Ka=1.11x10^{-3}[/tex]

Explanation:

Hello,

In this case, since the ionization of the given HA acid is:

[tex]HA\rightleftharpoons H^++A^-[/tex]

The equilibrium expression is:

[tex]Ka=\frac{[H^+][A^-]}{[HA]}[/tex]

Whereas the concentration of hydrogen ions is compute from the pH=

[tex][H^+]=10^{-pH}=10^{-2.00}=0.01M[/tex]

Which also equals the concentration of [tex]A^-[/tex] and the in general the ionization extent, therefore, the acid ionization constant, Ka, turns out:

[tex]Ka=\frac{0.01*0.01}{0.1-0.01}\\ \\Ka=1.11x10^{-3}[/tex]

Regards.

Answer:the answer is hypothesis

Explanation: that’s the answer

Answer:

3 mL

Explanation:

1 cubic centimeter (cm³) is equal to 1 milliliter (mL).

We want to find out how many milliliters 3 cm³ is equal to.

Since 1 cm³ is equal to 1 mL, 3 cm³ is equal to 3 mL.

The quantity of 3.00 cm³ is the same as 3 milliliters (mL).

Answer:

27 or [tex]3.00^{3}[/tex] (they're the same)

Explanation:

Therefore, 27 cm is the same as 27 mL.

Answer:

It is becoming more acidic.

Explanation:

The pH scale is a way to express the concentration of hydrogen ions. This scale goes from 0 to 14 and it is adimensional.

The lower the pH, the more acidic the solution. Since the pH of the garden soil of Olivia is decreasing, it is becoming more acidic.

Answer : The kinetic energy will be 24 J.

Explanation : Given,

Mass of marble = 3 kg

Velocity of a marble = 4 m/s

Formula used to calculate the kinetic energy is:

[tex]K.E=\frac{mv^2}{2}[/tex]

where,

K.E = kinetic energy

m = mass

v = velocity

Now putting all the given values in this formula, we get:

[tex]K.E=\frac{3kg\times (4m/s)^2}{2}[/tex]

[tex]K.E=24kg.m^2/s^2=24J[/tex]            [tex](1J=1kg.m^2/s^2)[/tex]

Therefore, the kinetic energy will be 24 J.

Answer:

Explanation:

The density of a substance can be found by using the formula

From the question

mass = 498 g

volume = 11.9 mL

Substitute the values into the above formula and solve for the Density

That's

We have the final answer as

Hope this helps you

Answer:

Malleability is intensive

Length is extensive

Hardness is intensive

Volume is extensive

Explanation:

Extensive properties change when u change the size of an object and intensive properties don’t

Also I just took the quiz

A physical property refer to the properties of an object that can be measured and observed without changing (altering) the chemical composition of the object.  

In Chemistry, there are two (2) main types of physical property and these include:

I. Extensive property: this is a property that changes when the size of an object changes. Some examples of an extensive property are:

II. Intensive property: it is a property that remains the same regardless of the change in the size of an object, Some examples of an intensive property are:

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