please help, I'm lost

We have 548 grams of CaCl2. How many molecules of CaCl2 do we have? (The molar mass of CaCl2 is 110.98 g/mol)

Group of answer choices
2.97 x 10^24 molecules
3.66 x 10^28 molecules
9.1 x 10^22 molecules
4.37 x 10^22 molecules

How many atoms are there in 0.075 mol of Pb

What are facts about Cells

Why does increasing temperature generally increase the rate of a chemical reaction?
A. It increases the amount of reactant
B. It decreases the size of the reactant particles.
C. It causes the particles of the reactants to move faster and collide more often.
D. It increases the space between reactant particles so they have more room to move apart

What part of a chemical is represented by the letters

What are prevailing winds?
A) winds found along the equator that vary in speed
B) winds that change seasonally and vary in speed
C) winds found at the poles at a consistent speed
D) winds that blow in the same direction at a consistent speed

How are the cells produced through mitosis and meiosis different?

How many milliliters are in 458 liters?

Help!
Which of the following can scientists NOT interpret by examining fossils?
A. How earth's environment has changed overtime.
B. How plants and animals have changed overtime.
C. The age of certain layers of rocks. D. How the pull of gravity has changed.​

Describe the behavior of water molecules during each stage of the water cycle.


Hurry pls this is due by the end of the class period so like 10 MINUTES HELP

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please help asap!!!!!!!!!!!!!!

heat flows naturally from objects that have higher energy to those with?

To find the volume of a ring, the water displacement method was used.
What is the volume of the ring with correct significant figures?

Thermal energy is added to water to raise the temperature to 250F.
Which of the following models BEST describes the movement of the particles after the thermal energy is added?

A reaction yields 6.25 grams of a product. What is the percent yield if the theoretical yield is 18.8 grams?

A car starts from rest. It takes 6.0 seconds for the car to accelerate to 5 m/s2 W. What is the final velocity?

Directions: Fill in the blanks with the correct terms to complete the statements. Write your answer on your answer
sheet.
1. Landforms like tall_______
act as an obstacle to traveling air masses, forcing them to rise over the peaks.

2.A___________is likely to dissolve or decrease its wind speed when it passes over a mountain or a mountain range.

3. Bodies of water like________is the main factor in the formation of typhoon.

4. The air in bodies of water is__________due to the evaporation of water.

5. Warm air builds up or increases the__________of a tropical cyclone.

help this question plzzss
I gave brainlest...​

There is 321 grams of H2SO4, how many molecules is this?

In a reaction vessel of 10.0 I, heat 9.00 g of water so that it partially decomposes. In the equilibrium mixture, 0.250 mol of water vapor is then still present. (a) Calculate the equilibrium constant K under the given conditions. (b) How is the equilibrium of the reaction affected by i. 1° reduction in volume ii. 2° increase in temperature?​

Your sick puppy is diagnosed with roundworms. They grow inside of the puppy. What type of symbiotic relationship do the puppy and the roundworms have?

A. Cooperative
B. Commensalism
C. Mutualism
D. parasitism

Select the correct text in the passage.

Which statements in this passage about volcanoes do not contain factual errors?

The Hawaiian islands are known for their volcanic activities. In fact, the islands were formed from volcanoes. Before a volcano erupts, earthquake activity beneath the volcano decreases. Scientists use seismometers to measure the earthquake activity that occurs beneath a volcano. They then predict the eruption of that volcano. When a volcano erupts, the amount of carbon dioxide and sulfur dioxide emitted decreases. Scientists measure the amount of these gases to determine the amount of magma present in the volcanic reservoir.

(I couldn't find the science subject so I just put chemistry)

2. in Journey to the Center of the Earth, by Jules Verne, an adventurer travels through the
layers of Earth until he reaches the center. While it is not possible actually to travel through
all of the layers of Earth, in what order would the adventurer have traveled to reach the
center? Rearrange the layers into the correct order Place the outer layer at the top and the
innernost layer at the bottom
1 Crust
3 Outercore
2 Mantie
4 Inner Core

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MR
Test #1 - Energetics
Assigned to Guests
by Trudy Jackson
Live Session
4 Questions

1
5
Calculate the standard enthalpy of formation of gaseous diborane (B2H6) using the following thermochemical information:
4B (s) + 3O2 (g)
→\rightarrow
→ 2B2O3 (s);
Δ\Delta
Δ H = -2509.1 kJ
2H2 (g) + O2 (g)
→\rightarrow
→ 2H2O (l);
Δ\Delta
Δ H = -571.7 kJ
B2H6 (g) + 3O2 (g)
→\rightarrow
→ B2O3 (s) + 3H2O (l);
Δ\Delta
Δ H = -2147.5 kJ
(click below to write/draw)

=

B2H6(G)

2B(S)+3H2
Show Your Work

2
5
Hydrogen cyanide can be prepared by the reaction:

CH4 (g) + NH3 (g)
→\rightarrow
→ HCN (g) + 3H2 (g)

What is the heat of reaction at constant pressure? Use the following thermochemical equations:

N2 (g) + 3H2 (g)
→ \rightarrow
→ 2NH3 (g);
Δ\Delta
Δ H = -91.8 kJ
C (graphite) + 2H2 (g)
→\rightarrow
→ CH4 (g);
Δ\Delta
Δ H = -74.9 kJ
H2 (g) + 2C (graphite) + N2 (g)
→\rightarrow
→2HCN (g);
Δ \Delta
Δ H = 270.3 kJ

(click below to write/draw)

3
5
Complete the following Born Haber cycle for barium phosphide, Ba3P2.
(click below to write/draw)

Show Your Work

4
5
Use bond energies to estimate
Δ\Delta
ΔH for the reaction below:
(click below to write/draw)

Show Your Work

You have responded to 1 of 4 questions.
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Hydrogen cyanide can be prepared by the reaction:

CH4 (g) + NH3 (g)
→\rightarrow
→ HCN (g) + 3H2 (g)

What is the heat of reaction at constant pressure? Use the following thermochemical equations:

N2 (g) + 3H2 (g)
→ \rightarrow
→ 2NH3 (g);
Δ\Delta
Δ H = -91.8 kJ
C (graphite) + 2H2 (g)
→\rightarrow
→ CH4 (g);
Δ\Delta
Δ H = -74.9 kJ
H2 (g) + 2C (graphite) + N2 (g)
→\rightarrow
→2HCN (g);
Δ \Delta
Δ H = 270.3 kJ

What is the name of the following compound?
Al4C3
-Silver carbonate
-Aluminum carbide
-Aluminum carborhte
-Silver carbide

How do ionic bonds form between atoms?

If a species is unable to adapt within a
changing environment what can happen to
that species?

balance the equation C2H5OH + 3O2 → CO2 + H2O

please help me on this question

How many grams of water can be heated from 25°C to 70°C using 15,000 J?

k2co3 major species present when dissolved in water